version: bump up to 3.5.12

[release-3.5] Bump golang.org/x/crypto to v0.17+ to address CVE-2023-48795

.github/workflows/e2e.yaml

@@ -11,22 +11,25 @@ jobs:
         - linux-386-e2e
     steps:
     - uses: actions/checkout@v2
+    - id: goversion
+      run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
     - uses: actions/setup-go@v2
       with:
-        go-version: "^1.16"
+        go-version: ${{ steps.goversion.outputs.goversion }}
     - run: date
     - env:
         TARGET: ${{ matrix.target }}
       run: |
+        set -euo pipefail
+
         echo "${TARGET}"
         case "${TARGET}" in
           linux-amd64-e2e)
-            PASSES='build release e2e' MANUAL_VER=v3.4.7 CPU='4' EXPECT_DEBUG='true' COVER='false' RACE='true' ./test.sh 2>&1 | tee test.log
-            ! egrep "(--- FAIL:|DATA RACE|panic: test timed out|appears to have leaked)" -B50 -A10 test.log
+            make install-gofail
+            CPU='4' EXPECT_DEBUG='true' COVER='false' RACE='true' FAILPOINTS='true' make test-e2e-release
             ;;
           linux-386-e2e)
-            GOARCH=386 PASSES='build e2e' CPU='4' EXPECT_DEBUG='true' COVER='false' RACE='true' ./test.sh 2>&1 | tee test.log
-            ! egrep "(--- FAIL:|DATA RACE|panic: test timed out|appears to have leaked)" -B50 -A10 test.log
+            GOARCH=386 CPU='4' EXPECT_DEBUG='true' COVER='false' RACE='true' make test-e2e
             ;;
           *)
             echo "Failed to find target"

.github/workflows/functional.yaml

@@ -10,13 +10,17 @@ jobs:
         - linux-amd64-functional
     steps:
     - uses: actions/checkout@v2
+    - id: goversion
+      run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
     - uses: actions/setup-go@v2
       with:
-        go-version: "^1.16"
+        go-version: ${{ steps.goversion.outputs.goversion }}
     - run: date
     - env:
         TARGET: ${{ matrix.target }}
       run: |
+        set -euo pipefail
+
         echo "${TARGET}"
         case "${TARGET}" in
           linux-amd64-functional)

.github/workflows/grpcproxy.yaml

@@ -10,18 +10,21 @@ jobs:
         - linux-amd64-grpcproxy
     steps:
     - uses: actions/checkout@v2
+    - id: goversion
+      run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
     - uses: actions/setup-go@v2
       with:
-        go-version: "^1.16"
+        go-version: ${{ steps.goversion.outputs.goversion }}
     - run: date
     - env:
         TARGET: ${{ matrix.target }}
       run: |
+        set -euo pipefail
+
         echo "${TARGET}"
         case "${TARGET}" in
           linux-amd64-grpcproxy)
-            PASSES='build grpcproxy'  CPU='4' COVER='false' RACE='true' ./test.sh 2>&1 | tee test.log
-            ! egrep "(--- FAIL:|DATA RACE|panic: test timed out|appears to have leaked)" -B50 -A10 test.log
+            PASSES='build grpcproxy'  CPU='4' COVER='false' RACE='true' ./test.sh
             ;;
           *)
             echo "Failed to find target"

.github/workflows/release.yaml

@@ -0,0 +1,32 @@
+name: Release
+on: [push, pull_request]
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - id: goversion
+      run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
+    - uses: actions/setup-go@v2
+      with:
+        go-version: ${{ steps.goversion.outputs.goversion }}
+    - name: release
+      run: |
+        set -euo pipefail
+
+        git config --global user.email "github-action@etcd.io"
+        git config --global user.name "Github Action"
+        gpg --batch --gen-key <<EOF
+        %no-protection
+        Key-Type: 1
+        Key-Length: 2048
+        Subkey-Type: 1
+        Subkey-Length: 2048
+        Name-Real: Github Action
+        Name-Email: github-action@etcd.io
+        Expire-Date: 0
+        EOF
+        DRY_RUN=true ./scripts/release --no-upload --no-docker-push --in-place 3.5.99
+    - name: test-image
+      run: |
+        VERSION=3.5.99 ./scripts/test_images.sh

.github/workflows/self-hosted-linux-arm64-graviton2-tests.yml

@@ -1,24 +0,0 @@
-name: Linux ARM64 Graviton2
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-jobs:
-  test:
-    runs-on: [self-hosted, linux, ARM64, graviton2]
-    steps:
-      - uses: actions/checkout@v2
-      - name: install dependencies
-        run: |
-          sudo amazon-linux-extras install epel
-          sudo yum install -y git gcc ShellCheck
-      - uses: actions/setup-go@v2
-        with:
-          go-version: "^1.16"
-      - run: go version
-      - run: date
-      - name: Run tests
-        run: TEST_OPTS="PASSES='fmt bom dep build unit integration_e2e'" make test

.github/workflows/self-hosted-linux-arm64-graviton2-tests.yml.md

@@ -1,142 +0,0 @@
-
-## Graviton-based self-hosted github action worker
-
-### Step 1. Create an EC2 instance with Graviton
-
-Create an AWS Graviton-based EC2 instance. For example,
-
-```
-# or download from https://github.com/aws/aws-k8s-tester/releases
-cd ${HOME}/go/src/github.com/aws/aws-k8s-tester
-go install -v ./cmd/ec2-utils
-
-# create arm64 AL2 instance
-AWS_K8S_TESTER_EC2_ON_FAILURE_DELETE=true \
-AWS_K8S_TESTER_EC2_LOG_COLOR=true \
-AWS_K8S_TESTER_EC2_REGION=us-west-2 \
-AWS_K8S_TESTER_EC2_S3_BUCKET_CREATE=true \
-AWS_K8S_TESTER_EC2_S3_BUCKET_CREATE_KEEP=true \
-AWS_K8S_TESTER_EC2_REMOTE_ACCESS_KEY_CREATE=true \
-AWS_K8S_TESTER_EC2_ASGS_FETCH_LOGS=false \
-AWS_K8S_TESTER_EC2_ASGS='{"GetRef.Name-arm64-al2-cpu":{"name":"GetRef.Name-arm64-al2-cpu","remote-access-user-name":"ec2-user","ami-type":"AL2_arm_64","image-id-ssm-parameter":"/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-arm64-gp2","instance-types":["m6g.xlarge"],"volume-size":40,"asg-min-size":1,"asg-max-size":1,"asg-desired-capacity":1}}' \
-AWS_K8S_TESTER_EC2_ROLE_CREATE=true \
-AWS_K8S_TESTER_EC2_VPC_CREATE=true \
-ec2-utils create instances --enable-prompt=true --auto-path
-```
-
-### Step 2. Install github action on the host
-
-SSH into the instance, and install the github action self-hosted runner (see [install scripts](https://github.com/etcd-io/etcd/settings/actions/runners/new?arch=arm64&os=linux)).
-
-### Step 3. Configure github action on the host
-
-SSH into the instance, and configure the github action self-hosted runner.
-
-First, we need disable ICU install (see [actions/runner issue on ARM64](https://github.com/actions/runner/issues/629)):
-
-```
-sudo yum install -y patch
-```
-
-And write this bash script:
-
-```
-#!/bin/bash -e
-
-patch -p1 <<ICU_PATCH
-diff -Naur a/bin/Runner.Listener.runtimeconfig.json b/bin/Runner.Listener.runtimeconfig.json
---- a/bin/Runner.Listener.runtimeconfig.json	2020-07-01 02:21:09.000000000 +0000
-+++ b/bin/Runner.Listener.runtimeconfig.json	2020-07-28 00:02:38.748868613 +0000
-@@ -8,7 +8,8 @@
-       }
-     ],
-     "configProperties": {
--      "System.Runtime.TieredCompilation.QuickJit": true
-+      "System.Runtime.TieredCompilation.QuickJit": true,
-+      "System.Globalization.Invariant": true
-     }
-   }
--}
-\ No newline at end of file
-+}
-diff -Naur a/bin/Runner.PluginHost.runtimeconfig.json b/bin/Runner.PluginHost.runtimeconfig.json
---- a/bin/Runner.PluginHost.runtimeconfig.json	2020-07-01 02:21:22.000000000 +0000
-+++ b/bin/Runner.PluginHost.runtimeconfig.json	2020-07-28 00:02:59.358680003 +0000
-@@ -8,7 +8,8 @@
-       }
-     ],
-     "configProperties": {
--      "System.Runtime.TieredCompilation.QuickJit": true
-+      "System.Runtime.TieredCompilation.QuickJit": true,
-+      "System.Globalization.Invariant": true
-     }
-   }
--}
-\ No newline at end of file
-+}
-diff -Naur a/bin/Runner.Worker.runtimeconfig.json b/bin/Runner.Worker.runtimeconfig.json
---- a/bin/Runner.Worker.runtimeconfig.json	2020-07-01 02:21:16.000000000 +0000
-+++ b/bin/Runner.Worker.runtimeconfig.json	2020-07-28 00:02:19.159028531 +0000
-@@ -8,7 +8,8 @@
-       }
-     ],
-     "configProperties": {
--      "System.Runtime.TieredCompilation.QuickJit": true
-+      "System.Runtime.TieredCompilation.QuickJit": true,
-+      "System.Globalization.Invariant": true
-     }
-   }
--}
-\ No newline at end of file
-+}
-ICU_PATCH
-```
-
-And now patch the github action runner:
-
-```
-cd ${HOME}/actions-runner
-bash patch.sh
-```
-
-```
-patching file bin/Runner.Listener.runtimeconfig.json
-patching file bin/Runner.PluginHost.runtimeconfig.json
-patching file bin/Runner.Worker.runtimeconfig.json
-```
-
-And now configure:
-
-```
-sudo yum install -y wget
-INSTANCE_ID=$(wget -q -O - http://169.254.169.254/latest/meta-data/instance-id)
-echo ${INSTANCE_ID}
-
-# get token from https://github.com/etcd-io/etcd/settings/actions/runners/new?arch=arm64&os=linux
-cd ${HOME}/actions-runner
-./config.sh \
---work "_work" \
---name ${INSTANCE_ID} \
---labels self-hosted,linux,ARM64,graviton2 \
---url https://github.com/etcd-io/etcd \
---token ...
-```
-
-And run:
-
-```
-# run this as a process in the terminal
-cd ${HOME}/actions-runner
-./run.sh
-
-# or run this as a systemd service
-cd ${HOME}/actions-runner
-sudo ./svc.sh install
-sudo ./svc.sh start
-sudo ./svc.sh status
-```
-
-### Step 4. Create github action configuration
-
-See https://github.com/etcd-io/etcd/pull/12928.
-

.github/workflows/tests-template.yaml

@@ -0,0 +1,70 @@
+---
+name: Reusable Tests Workflow
+on:
+  workflow_call:
+    inputs:
+      arch:
+        required: true
+        type: string
+      runs-on:
+        required: true
+        type: string
+      targets:
+        required: false
+        type: string
+
+jobs:
+  test:
+    runs-on: ${{ inputs.runs-on }}
+    # this is to prevent arm64 jobs from running at forked projects
+    if: inputs.arch == 'amd64' || github.repository == 'etcd-io/etcd'
+    strategy:
+      fail-fast: false
+      matrix:
+        target: ${{ fromJSON(inputs.targets) }}
+    steps:
+      - uses: actions/checkout@v2
+      - id: goversion
+        run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ${{ steps.goversion.outputs.goversion }}
+      - run: date
+      - env:
+          TARGET: ${{ matrix.target }}
+        run: |
+          set -euo pipefail
+
+          echo "${TARGET}"
+          case "${TARGET}" in
+            linux-integration-1-cpu)
+              GOARCH=${{ inputs.arch }} CPU=1 RACE='false' make test-integration
+              ;;
+            linux-integration-2-cpu)
+              GOARCH=${{ inputs.arch }} CPU=2 RACE='false' make test-integration
+              ;;
+            linux-integration-4-cpu)
+              GOARCH=${{ inputs.arch }} CPU=4 RACE='false' make test-integration
+              ;;
+            linux-unit-4-cpu-race)
+              GOARCH=${{ inputs.arch }} RACE='true' CPU='4' GO_TEST_FLAGS='-p=2' make test-unit
+              ;;
+            linux-386-unit-1-cpu)
+              GOOS=linux GOARCH=386 CPU=1 GO_TEST_FLAGS='-p=4' make test-unit
+              ;;
+            all-build)
+              GOARCH=amd64 PASSES='build' ./test.sh
+              GOARCH=386 PASSES='build' ./test.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOOS=darwin GOARCH=amd64 ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOOS=darwin GOARCH=arm64 ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOOS=windows GOARCH=amd64 ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=arm ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=arm64 ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=ppc64le ./build.sh
+              GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=s390x ./build.sh
+              ;;
+            *)
+              echo "Failed to find target"
+              exit 1
+              ;;
+          esac

.github/workflows/tests.yaml

@@ -1,60 +1,23 @@
 name: Tests
 on: [push, pull_request]
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        target:
-        - linux-amd64-fmt
-        - linux-amd64-integration-1-cpu
-        - linux-amd64-integration-2-cpu
-        - linux-amd64-integration-4-cpu
-        - linux-amd64-unit-4-cpu-race
-        - all-build
-        - linux-386-unit-1-cpu
-    steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-go@v2
-      with:
-        go-version: "^1.16"
-    - run: date
-    - env:
-        TARGET: ${{ matrix.target }}
-      run: |
-        echo "${TARGET}"
-        case "${TARGET}" in
-          linux-amd64-fmt)
-            GOARCH=amd64 PASSES='fmt bom dep' ./test.sh
-            ;;
-          linux-amd64-integration-1-cpu)
-            GOARCH=amd64 CPU=1 PASSES='integration' RACE='false' ./test.sh
-            ;;
-          linux-amd64-integration-2-cpu)
-            GOARCH=amd64 CPU=2 PASSES='integration' RACE='false' ./test.sh
-            ;;
-          linux-amd64-integration-4-cpu)
-            GOARCH=amd64 CPU=4 PASSES='integration' RACE='false' ./test.sh
-            ;;
-          linux-amd64-unit-4-cpu-race)
-            GOARCH=amd64 PASSES='unit' RACE='true' CPU='4' ./test.sh -p=2
-            ;;
-          all-build)
-            GOARCH=amd64 PASSES='build' ./test.sh
-            GOARCH=386 PASSES='build' ./test.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOOS=darwin GOARCH=amd64 ./build.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOOS=windows GOARCH=amd64 ./build.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=arm ./build.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=arm64 ./build.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=ppc64le ./build.sh
-            GO_BUILD_FLAGS='-v -mod=readonly' GOARCH=s390x ./build.sh
-            ;;
-          linux-386-unit-1-cpu)
-            GOARCH=386 PASSES='unit' RACE='false' CPU='1' ./test -p=4
-            ;;
-          *)
-            echo "Failed to find target"
-            exit 1
-            ;;
-        esac
+  amd64:
+    uses: ./.github/workflows/tests-template.yaml
+    with:
+      arch: amd64
+      runs-on: ubuntu-latest
+      targets: "['linux-integration-1-cpu',
+        'linux-integration-2-cpu',
+        'linux-integration-4-cpu',
+        'linux-unit-4-cpu-race',
+        'linux-386-unit-1-cpu',
+        'all-build']"
+  arm64:
+    uses: ./.github/workflows/tests-template.yaml
+    with:
+      arch: arm64
+      runs-on: actuated-arm64-8cpu-32gb
+      targets: "['linux-integration-1-cpu',
+        'linux-integration-2-cpu',
+        'linux-integration-4-cpu',
+        'linux-unit-4-cpu-race']"

.github/workflows/trivy-nightly-scan.yaml

@@ -0,0 +1,37 @@
+name: Trivy Nightly Scan
+on:
+  schedule:
+    - cron: '0 2 * * *' # run at 2 AM UTC
+
+permissions: read-all 
+jobs:
+  nightly-scan:
+    name: Trivy Scan nightly
+    strategy:
+      fail-fast: false
+      matrix:
+        # maintain the versions of etcd that need to be actively
+        # security scanned
+        versions: [v3.5.6]
+    permissions:
+      security-events: write  # for github/codeql-action/upload-sarif to upload SARIF results
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        with:
+          ref: release-3.5
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@9ab158e8597f3b310480b9a69402b419bc03dbd5 # master
+        with:
+          image-ref: 'gcr.io/etcd-development/etcd:${{ matrix.versions }}'
+          severity: 'CRITICAL,HIGH'
+          format: 'template'
+          template: '@/contrib/sarif.tpl'
+          output: 'trivy-results-3-5.sarif'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@a669cc5936cc5e1b6a362ec1ff9e410dc570d190 # v2.1.36
+        with:
+          sarif_file: 'trivy-results-3-5.sarif'

.go-version

@@ -0,0 +1 @@
+1.20.13

.travis.yml

@@ -1,51 +0,0 @@
-language: go
-go_import_path: go.etcd.io/etcd/v3
-
-sudo: required
-
-services: docker
-
-go:
-  - "1.16.3"
-  - tip
-
-notifications:
-  on_success: never
-  on_failure: never
-
-env:
-  matrix:
-    - TARGET=linux-amd64-coverage
-    - TARGET=linux-amd64-fmt-unit-go-tip-2-cpu
-
-matrix:
-  fast_finish: true
-  allow_failures:
-    - go: "1.16.3"
-      env: TARGET=linux-amd64-coverage
-    - go: tip
-      env: TARGET=linux-amd64-fmt-unit-go-tip-2-cpu
-  exclude:
-    - go: tip
-      env: TARGET=linux-amd64-coverage
-    - go: "1.16.3"
-      env: TARGET=linux-amd64-fmt-unit-go-tip-2-cpu
-
-before_install:
-  - if [[ $TRAVIS_GO_VERSION == 1.* ]]; then docker pull gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION}; fi
-
-install:
-  - date
-
-script:
-  - date
-  - echo "TRAVIS_GO_VERSION=${TRAVIS_GO_VERSION}"
-  - >
-    case "${TARGET}" in
-      linux-amd64-coverage)
-        sudo HOST_TMP_DIR=/tmp TEST_OPTS="VERBOSE='1'" make docker-test-coverage
-        ;;
-      linux-amd64-fmt-unit-go-tip-2-cpu)
-        GOARCH=amd64 PASSES='fmt unit' CPU='2' RACE='false' ./test.sh -p=2
-        ;;
-    esac

ADOPTERS.md

@@ -1,250 +0,0 @@
----
-title: Production users
----
-
-This document tracks people and use cases for etcd in production. By creating a list of production use cases we hope to build a community of advisors that we can reach out to with experience using various etcd applications, operation environments, and cluster sizes. The etcd development team may reach out periodically to check-in on how etcd is working in the field and update this list.
-
-## All Kubernetes Users
-
-- *Application*: https://kubernetes.io/
-- *Environments*: AWS, OpenStack, Azure, Google Cloud, Huawei Cloud, Bare Metal, etc
-
-**This is a meta user; please feel free to document specific Kubernetes clusters!**
-
-All Kubernetes clusters use etcd as their primary data store. This means etcd's users include such companies as [Niantic, Inc Pokemon Go](https://cloudplatform.googleblog.com/2016/09/bringing-Pokemon-GO-to-life-on-Google-Cloud.html), [Box](https://blog.box.com/blog/kubernetes-box-microservices-maximum-velocity/), [CoreOS](https://coreos.com/tectonic), [Ticketmaster](https://www.youtube.com/watch?v=wqXVKneP0Hg), [Salesforce](https://www.salesforce.com) and many many more.
-
-## discovery.etcd.io
-
-- *Application*: https://github.com/coreos/discovery.etcd.io
-- *Launched*: Feb. 2014
-- *Cluster Size*: 5 members, 5 discovery proxies
-- *Order of Data Size*: 100s of Megabytes
-- *Operator*: CoreOS, brandon.philips@coreos.com
-- *Environment*: AWS
-- *Backups*: Periodic async to S3
-
-discovery.etcd.io is the longest continuously running etcd backed service that we know about. It is the basis of automatic cluster bootstrap and was launched in Feb. 2014: https://coreos.com/blog/etcd-0.3.0-released/.
-
-## OpenTable
-
-- *Application*: OpenTable internal service discovery and cluster configuration management
-- *Launched*: May 2014
-- *Cluster Size*: 3 members each in 6 independent clusters; approximately 50 nodes reading / writing
-- *Order of Data Size*: 10s of MB
-- *Operator*: OpenTable, Inc; sschlansker@opentable.com
-- *Environment*: AWS, VMWare
-- *Backups*: None, all data can be re-created if necessary.
-
-## cycoresys.com
-
-- *Application*: multiple
-- *Launched*: Jul. 2014
-- *Cluster Size*: 3 members, _n_ proxies
-- *Order of Data Size*: 100s of kilobytes
-- *Operator*: CyCore Systems, Inc, sys@cycoresys.com
-- *Environment*: Baremetal
-- *Backups*: Periodic sync to Ceph RadosGW and DigitalOcean VM
-
-CyCore Systems provides architecture and engineering for computing systems.  This cluster provides microservices, virtual machines, databases, storage clusters to a number of clients.  It is built on CoreOS machines, with each machine in the cluster running etcd as a peer or proxy.
-
-## Radius Intelligence
-
-- *Application*: multiple internal tools, Kubernetes clusters, bootstrappable system configs
-- *Launched*: June 2015
-- *Cluster Size*: 2 clusters of 5 and 3 members; approximately a dozen nodes read/write
-- *Order of Data Size*: 100s of kilobytes
-- *Operator*: Radius Intelligence; jcderr@radius.com
-- *Environment*: AWS, CoreOS, Kubernetes
-- *Backups*: None, all data can be recreated if necessary.
-
-Radius Intelligence uses Kubernetes running CoreOS to containerize and scale internal toolsets. Examples include running [JetBrains TeamCity][teamcity] and internal AWS security and cost reporting tools. etcd clusters back these clusters as well as provide some basic environment bootstrapping configuration keys.
-
-## Vonage
-
-- *Application*: kubernetes, vault backend, system configuration for microservices, scheduling, locks (future - service discovery)
-- *Launched*: August 2015
-- *Cluster Size*: 2 clusters of 5 members in 2 DCs, n local proxies 1-to-1 with microservice, (ssl and SRV look up)
-- *Order of Data Size*: kilobytes
-- *Operator*: Vonage [devAdmin][raoofm]
-- *Environment*: VMWare, AWS
-- *Backups*: Daily snapshots on VMs. Backups done for upgrades.
-
-## PD
-
-- *Application*: embed etcd
-- *Launched*: Mar 2016
-- *Cluster Size*: 3 or 5 members
-- *Order of Data Size*: megabytes
-- *Operator*: PingCAP, Inc.
-- *Environment*: Bare Metal, AWS, etc.
-- *Backups*: None.
-
-PD(Placement Driver) is the central controller in the TiDB cluster. It saves the cluster meta information, schedule the data, allocate the global unique timestamp for the distributed transaction, etc. It embeds etcd to supply high availability and auto failover.
-
-## Huawei
-
-- *Application*: System configuration for overlay network (Canal)
-- *Launched*: June 2016
-- *Cluster Size*: 3 members for each cluster
-- *Order of Data Size*: kilobytes
-- *Operator*: Huawei Euler Department
-- *Environment*: [Huawei Cloud](http://www.hwclouds.com/product/cce.html)
-- *Backups*: None, all data can be recreated if necessary.
-
-[teamcity]: https://www.jetbrains.com/teamcity/
-[raoofm]:https://github.com/raoofm
-
-## Qiniu Cloud
-
-- *Application*: system configuration for microservices, distributed locks
-- *Launched*: Jan. 2016
-- *Cluster Size*: 3 members each with several clusters
-- *Order of Data Size*: kilobytes
-- *Operator*: Pandora, chenchao@qiniu.com
-- *Environment*: Baremetal
-- *Backups*: None, all data can be recreated if necessary
-
-## QingCloud
-
-- *Application*: [QingCloud][qingcloud] appcenter cluster for service discovery as [metad][metad] backend.
-- *Launched*: December 2016
-- *Cluster Size*: 1 cluster of 3 members per user.
-- *Order of Data Size*: kilobytes
-- *Operator*: [yunify][yunify]
-- *Environment*: QingCloud IaaS
-- *Backups*: None, all data can be recreated if necessary.
-
-[metad]:https://github.com/yunify/metad
-[yunify]:https://github.com/yunify
-[qingcloud]:https://qingcloud.com/
-
-
-## Yandex
-
-- *Application*: system configuration for services, service discovery
-- *Launched*: March 2016
-- *Cluster Size*: 3 clusters of 5 members
-- *Order of Data Size*: several gigabytes
-- *Operator*: Yandex; [nekto0n][nekto0n]
-- *Environment*: Bare Metal
-- *Backups*: None
-
-[nekto0n]:https://github.com/nekto0n
-
-## Tencent Games
-
-- *Application*: Meta data and configuration data for service discovery, Kubernetes, etc.
-- *Launched*: Jan. 2015
-- *Cluster Size*: 3 members each with 10s of clusters
-- *Order of Data Size*: 10s of Megabytes
-- *Operator*: Tencent Game Operations Department
-- *Environment*: Baremetal
-- *Backups*: Periodic sync to backup server
-
-In Tencent games, we use Docker and Kubernetes to deploy and run our applications, and use etcd to save meta data for service discovery, Kubernetes, etc.
-
-## Hyper.sh
-
-- *Application*: Kubernetes, distributed locks, etc.
-- *Launched*: April 2016
-- *Cluster Size*: 1 cluster of 3 members
-- *Order of Data Size*: 10s of MB
-- *Operator*: Hyper.sh
-- *Environment*: Baremetal
-- *Backups*: None, all data can be recreated if necessary.
-
-In [hyper.sh][hyper.sh], the container service is backed by [hypernetes][hypernetes], a multi-tenant kubernetes distro. Moreover, we use etcd to coordinate the multiple manage services and store global meta data.
-
-[hypernetes]:https://github.com/hyperhq/hypernetes
-[Hyper.sh]:https://www.hyper.sh
-
-## Meitu
-- *Application*: system configuration for services, service discovery, kubernetes in test environment
-- *Launched*: October 2015
-- *Cluster Size*: 1 cluster of 3 members
-- *Order of Data Size*: megabytes
-- *Operator*: Meitu, hxj@meitu.com, [shafreeck][shafreeck]
-- *Environment*: Bare Metal
-- *Backups*: None, all data can be recreated if necessary.
-
-[shafreeck]:https://github.com/shafreeck
-
-## Grab
-- *Application*: system configuration for services, service discovery
-- *Launched*: June 2016
-- *Cluster Size*: 1 cluster of 7 members
-- *Order of Data Size*: megabytes
-- *Operator*: Grab, [taxitan][taxitan], [reterVision][reterVision]
-- *Environment*: AWS
-- *Backups*: None, all data can be recreated if necessary.
-
-[taxitan]:https://github.com/taxitan
-[reterVision]:https://github.com/reterVision
-
-## DaoCloud.io
-
-- *Application*: container management
-- *Launched*: Sep. 2015
-- *Cluster Size*: 1000+ deployments, each deployment contains a 3 node cluster.
-- *Order of Data Size*: 100s of Megabytes
-- *Operator*: daocloud.io
-- *Environment*: Baremetal and virtual machines
-- *Backups*: None, all data can be recreated if necessary.
-
-In [DaoCloud][DaoCloud], we use Docker and Swarm to deploy and run our applications, and we use etcd to save metadata for service discovery.
-
-[DaoCloud]:https://www.daocloud.io
-
-## Branch.io
-
-- *Application*: Kubernetes
-- *Launched*: April 2016
-- *Cluster Size*: Multiple clusters, multiple sizes
-- *Order of Data Size*: 100s of Megabytes
-- *Operator*: branch.io
-- *Environment*: AWS, Kubernetes
-- *Backups*: EBS volume backups
-
-At [Branch][branch], we use kubernetes heavily as our core microservice platform for staging and production.
-
-[branch]: https://branch.io
-
-## Baidu Waimai
-
-- *Application*: SkyDNS, Kubernetes, UDC, CMDB and other distributed systems
-- *Launched*: April. 2016
-- *Cluster Size*: 3 clusters of 5 members
-- *Order of Data Size*: several gigabytes
-- *Operator*: Baidu Waimai Operations Department
-- *Environment*: CentOS 6.5
-- *Backups*: backup scripts
-
-## Salesforce.com
-
-- *Application*: Kubernetes
-- *Launched*: Jan 2017
-- *Cluster Size*: Multiple clusters of 3 members
-- *Order of Data Size*: 100s of Megabytes
-- *Operator*: Salesforce.com (krmayankk@github)
-- *Environment*: BareMetal
-- *Backups*: None, all data can be recreated
-
-## Hosted Graphite
-
-- *Application*: Service discovery, locking, ephemeral application data
-- *Launched*: January 2017
-- *Cluster Size*: 2 clusters of 7 members
-- *Order of Data Size*: Megabytes
-- *Operator*: Hosted Graphite (sre@hostedgraphite.com)
-- *Environment*: Bare Metal
-- *Backups*: None, all data is considered ephemeral.
-
-## Transwarp
-
-- *Application*: Transwarp Data Cloud, Transwarp Operating System, Transwarp Data Hub, Sophon
-- *Launched*: January 2016
-- *Cluster Size*: Multiple clusters, multiple sizes
-- *Order of Data Size*: Megabytes
-- *Operator*: Trasnwarp Operating System
-- *Environment*: Bare Metal, Container
-- *Backups*: backup scripts

CHANGELOG-2.3.md

@@ -1,16 +0,0 @@
-
-
-<hr>
-
-
-## [v2.3.8](https://github.com/etcd-io/etcd/releases/tag/v2.3.8) (2017-02-17)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v2.3.7...v2.3.8).
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-

CHANGELOG-3.0.md

@@ -1,291 +0,0 @@
-
-
-<hr>
-
-
-## [v3.0.16](https://github.com/etcd-io/etcd/releases/tag/v3.0.16) (2016-11-13)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.15...v3.0.16) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.4*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.15](https://github.com/etcd-io/etcd/releases/tag/v3.0.15) (2016-11-11)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.14...v3.0.15) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Fixed
-
-- Fix cancel watch request with wrong range end.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.14](https://github.com/etcd-io/etcd/releases/tag/v3.0.14) (2016-11-04)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.13...v3.0.14) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Added
-
-- v3 `etcdctl migrate` command now supports `--no-ttl` flag to discard keys on transform.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.13](https://github.com/etcd-io/etcd/releases/tag/v3.0.13) (2016-10-24)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.12...v3.0.13) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.12](https://github.com/etcd-io/etcd/releases/tag/v3.0.12) (2016-10-07)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.11...v3.0.12) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.11](https://github.com/etcd-io/etcd/releases/tag/v3.0.11) (2016-10-07)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.10...v3.0.11) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Added
-
-- Server returns previous key-value (optional)
-  - `clientv3.WithPrevKV` option
-  - v3 etcdctl `put,watch,del --prev-kv` flag
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.10](https://github.com/etcd-io/etcd/releases/tag/v3.0.10) (2016-09-23)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.9...v3.0.10) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.9](https://github.com/etcd-io/etcd/releases/tag/v3.0.9) (2016-09-15)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.8...v3.0.9) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Added
-
-- Warn on domain names on listen URLs (v3.2 will reject domain names).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.8](https://github.com/etcd-io/etcd/releases/tag/v3.0.8) (2016-09-09)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.7...v3.0.8) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Other
-
-- Allow only IP addresses in listen URLs (domain names are rejected).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.7](https://github.com/etcd-io/etcd/releases/tag/v3.0.7) (2016-08-31)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.6...v3.0.7) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Other
-
-- SRV records only allow A records (RFC 2052).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.6](https://github.com/etcd-io/etcd/releases/tag/v3.0.6) (2016-08-19)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.5...v3.0.6) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.5](https://github.com/etcd-io/etcd/releases/tag/v3.0.5) (2016-08-19)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.4...v3.0.5) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Other
-
-- SRV records (e.g., infra1.example.com) must match the discovery domain (i.e., example.com) if no custom certificate authority is given.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.4](https://github.com/etcd-io/etcd/releases/tag/v3.0.4) (2016-07-27)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.3...v3.0.4) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Added
-
-- v2 `etcdctl ls` command now supports `--output=json`.
-- Add /var/lib/etcd directory to etcd official Docker image.
-
-### Other
-
-- v2 auth can now use common name from TLS certificate when `--client-cert-auth` is enabled.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.3](https://github.com/etcd-io/etcd/releases/tag/v3.0.3) (2016-07-15)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.2...v3.0.3) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Other
-
-- Revert Dockerfile to use `CMD`, instead of `ENTRYPOINT`, to support `etcdctl` run.
-  - Docker commands for v3.0.2 won't work without specifying executable binary paths.
-- v3 etcdctl default endpoints are now `127.0.0.1:2379`.
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.2](https://github.com/etcd-io/etcd/releases/tag/v3.0.2) (2016-07-08)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.1...v3.0.2) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Other
-
-- Dockerfile uses `ENTRYPOINT`, instead of `CMD`, to run etcd without binary path specified.
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.1](https://github.com/etcd-io/etcd/releases/tag/v3.0.1) (2016-07-01)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.0...v3.0.1) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-
-
-## [v3.0.0](https://github.com/etcd-io/etcd/releases/tag/v3.0.0) (2016-06-30)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v2.3.0...v3.0.0) and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_0/).**
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-<hr>
-

CHANGELOG-3.1.md

@@ -1,578 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.0](https://github.com/etcd-io/etcd/blob/main/CHANGELOG-3.0.md).
-
-
-The minimum recommended etcd versions to run in **production** are 3.1.11+, 3.2.26+, and 3.3.11+.
-
-
-<hr>
-
-## [v3.1.21](https://github.com/etcd-io/etcd/releases/tag/v3.1.21) (2019-TBD)
-
-### etcdctl v3
-
-- [Strip out insecure endpoints from DNS SRV records when using discovery](https://github.com/etcd-io/etcd/pull/10443) with etcdctl v2
-- Add [`etcdctl endpoint health --write-out` support](https://github.com/etcd-io/etcd/pull/9540).
-  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/etcd-io/etcd/issues/9532).
-  - The command output is changed. Previously, if endpoint is unreachable, the command output is
-  "\<endpoint\> is unhealthy: failed to connect: \<error message\>". This change unified the error message, all error types
-  now have the same output "\<endpoint\> is unhealthy: failed to commit proposal: \<error message\>".
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Fix bug where [db_compaction_total_duration_milliseconds metric incorrectly measured duration as 0](https://github.com/etcd-io/etcd/pull/10646).
-
-<hr>
-
-## [v3.1.20](https://github.com/etcd-io/etcd/releases/tag/v3.1.20) (2018-10-10)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.19...v3.1.20) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Improved
-
-- Improve ["became inactive" warning log](https://github.com/etcd-io/etcd/pull/10024), which indicates message send to a peer failed.
-- Improve [read index wait timeout warning log](https://github.com/etcd-io/etcd/pull/10026), which indicates that local node might have slow network.
-- Add [gRPC interceptor for debugging logs](https://github.com/etcd-io/etcd/pull/9990); enable `etcd --debug` flag to see per-request debug information.
-- Add [consistency check in snapshot status](https://github.com/etcd-io/etcd/pull/10109). If consistency check on snapshot file fails, `snapshot status` returns `"snapshot file integrity check failed..."` error.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Improve [`etcd_network_peer_round_trip_time_seconds`](https://github.com/etcd-io/etcd/pull/10155) Prometheus metric to track leader heartbeats.
-  - Previously, it only samples the TCP connection for snapshot messages.
-- Display all registered [gRPC metrics at start](https://github.com/etcd-io/etcd/pull/10034).
-- Add [`etcd_snap_db_fsync_duration_seconds_count`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_snap_db_save_total_duration_seconds_bucket`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_send_success`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_send_failures`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_send_total_duration_seconds`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_receive_success`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_receive_failures`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_network_snapshot_receive_total_duration_seconds`](https://github.com/etcd-io/etcd/pull/9997) Prometheus metric.
-- Add [`etcd_server_id`](https://github.com/etcd-io/etcd/pull/9998) Prometheus metric.
-- Add [`etcd_server_health_success`](https://github.com/etcd-io/etcd/pull/10156) Prometheus metric.
-- Add [`etcd_server_health_failures`](https://github.com/etcd-io/etcd/pull/10156) Prometheus metric.
-- Add [`etcd_server_read_indexes_failed_total`](https://github.com/etcd-io/etcd/pull/10094) Prometheus metric.
-
-### client v3
-
-- Fix logic on [release lock key if cancelled](https://github.com/etcd-io/etcd/pull/10153) in `clientv3/concurrency` package.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.19](https://github.com/etcd-io/etcd/releases/tag/v3.1.19) (2018-07-24)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.18...v3.1.19) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Improved
-
-- Improve [Raft Read Index timeout warning messages](https://github.com/etcd-io/etcd/pull/9897).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_go_version`](https://github.com/etcd-io/etcd/pull/9957) Prometheus metric.
-- Add [`etcd_server_slow_read_indexes_total`](https://github.com/etcd-io/etcd/pull/9897) Prometheus metric.
-- Add [`etcd_server_quota_backend_bytes`](https://github.com/etcd-io/etcd/pull/9820) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_mvcc_db_total_size_in_bytes`](https://github.com/etcd-io/etcd/pull/9819) Prometheus metric.
-  - In addition to [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/etcd-io/etcd/pull/9819).
-- Add [`etcd_mvcc_db_total_size_in_use_in_bytes`](https://github.com/etcd-io/etcd/pull/9256) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-
-### client v3
-
-- Fix [lease keepalive interval updates when response queue is full](https://github.com/etcd-io/etcd/pull/9952).
-  - If `<-chan *clientv3LeaseKeepAliveResponse` from `clientv3.Lease.KeepAlive` was never consumed or channel is full, client was [sending keepalive request every 500ms](https://github.com/etcd-io/etcd/issues/9911) instead of expected rate of every "TTL / 3" duration.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.18](https://github.com/etcd-io/etcd/releases/tag/v3.1.18) (2018-06-15)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.17...v3.1.18) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_version`](https://github.com/etcd-io/etcd/pull/8960) Prometheus metric.
-  - To replace [Kubernetes `etcd-version-monitor`](https://github.com/etcd-io/etcd/issues/8948).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.17](https://github.com/etcd-io/etcd/releases/tag/v3.1.17) (2018-06-06)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.16...v3.1.17) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Fix [v3 snapshot recovery](https://github.com/etcd-io/etcd/issues/7628).
-  - A follower receives a leader snapshot to be persisted as a `[SNAPSHOT-INDEX].snap.db` file on disk.
-  - Now, server [ensures that the incoming snapshot be persisted on disk before loading it](https://github.com/etcd-io/etcd/pull/7876).
-  - Otherwise, index mismatch happens and triggers server-side panic (e.g. newer WAL entry with outdated snapshot index).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.16](https://github.com/etcd-io/etcd/releases/tag/v3.1.16) (2018-05-31)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.15...v3.1.16) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Fix [`mvcc` server panic from restore operation](https://github.com/etcd-io/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Now, this server-side panic has been fixed.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.15](https://github.com/etcd-io/etcd/releases/tag/v3.1.15) (2018-05-09)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.14...v3.1.15) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Purge old [`*.snap.db` snapshot files](https://github.com/etcd-io/etcd/pull/7967).
-  - Previously, etcd did not respect `--max-snapshots` flag to purge old `*.snap.db` files.
-  - Now, etcd purges old `*.snap.db` files to keep maximum `--max-snapshots` number of files on disk.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.14](https://github.com/etcd-io/etcd/releases/tag/v3.1.14) (2018-04-24)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.13...v3.1.14) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_is_leader`](https://github.com/etcd-io/etcd/pull/9587) Prometheus metric.
-
-### etcd server
-
-- Add [`--initial-election-tick-advance`](https://github.com/etcd-io/etcd/pull/9591) flag to configure initial election tick fast-forward.
-  - By default, `--initial-election-tick-advance=true`, then local member fast-forwards election ticks to speed up "initial" leader election trigger.
-  - This benefits the case of larger election ticks. For instance, cross datacenter deployment may require longer election timeout of 10-second. If true, local node does not need wait up to 10-second. Instead, forwards its election ticks to 8-second, and have only 2-second left before leader election.
-  - Major assumptions are that: cluster has no active leader thus advancing ticks enables faster leader election. Or cluster already has an established leader, and rejoining follower is likely to receive heartbeats from the leader after tick advance and before election timeout.
-  - However, when network from leader to rejoining follower is congested, and the follower does not receive leader heartbeat within left election ticks, disruptive election has to happen thus affecting cluster availabilities.
-  - Now, this can be disabled by setting `--initial-election-tick-advance=false`.
-  - Disabling this would slow down initial bootstrap process for cross datacenter deployments. Make tradeoffs by configuring `--initial-election-tick-advance` at the cost of slow initial bootstrap.
-  - If single-node, it advances ticks regardless.
-  - Address [disruptive rejoining follower node](https://github.com/etcd-io/etcd/issues/9333).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.13](https://github.com/etcd-io/etcd/releases/tag/v3.1.13) (2018-03-29)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.12...v3.1.13) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Improved
-
-- Adjust [election timeout on server restart](https://github.com/etcd-io/etcd/pull/9415) to reduce [disruptive rejoining servers](https://github.com/etcd-io/etcd/issues/9333).
-  - Previously, etcd fast-forwards election ticks on server start, with only one tick left for leader election. This is to speed up start phase, without having to wait until all election ticks elapse. Advancing election ticks is useful for cross datacenter deployments with larger election timeouts. However, it was affecting cluster availability if the last tick elapses before leader contacts the restarted node.
-  - Now, when etcd restarts, it adjusts election ticks with more than one tick left, thus more time for leader to prevent disruptive restart.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://github.com/etcd-io/etcd/tree/main/Documentation/metrics) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add missing [`etcd_network_peer_sent_failures_total` count](https://github.com/etcd-io/etcd/pull/9437).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.12](https://github.com/etcd-io/etcd/releases/tag/v3.1.12) (2018-03-08)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.11...v3.1.12) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Fix [`mvcc` "unsynced" watcher restore operation](https://github.com/etcd-io/etcd/pull/9297).
-  - "unsynced" watcher is watcher that needs to be in sync with events that have happened.
-  - That is, "unsynced" watcher is the slow watcher that was requested on old revision.
-  - "unsynced" watcher restore operation was not correctly populating its underlying watcher group.
-  - Which possibly causes [missing events from "unsynced" watchers](https://github.com/etcd-io/etcd/issues/9086).
-  - A node gets network partitioned with a watcher on a future revision, and falls behind receiving a leader snapshot after partition gets removed. When applying this snapshot, etcd watch storage moves current synced watchers to unsynced since sync watchers might have become stale during network partition. And reset synced watcher group to restart watcher routines. Previously, there was a bug when moving from synced watcher group to unsynced, thus client would miss events when the watcher was requested to the network-partitioned node.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.11](https://github.com/etcd-io/etcd/releases/tag/v3.1.11) (2017-11-28)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.10...v3.1.11) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- [#8411](https://github.com/etcd-io/etcd/issues/8411),[#8806](https://github.com/etcd-io/etcd/pull/8806) backport "mvcc: sending events after restore"
-- [#8009](https://github.com/etcd-io/etcd/issues/8009),[#8902](https://github.com/etcd-io/etcd/pull/8902) backport coreos/bbolt v1.3.1-coreos.5
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-<hr>
-
-
-## [v3.1.10](https://github.com/etcd-io/etcd/releases/tag/v3.1.10) (2017-07-14)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.9...v3.1.10) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Added
-
-- Tag docker images with minor versions.
-  - e.g. `docker pull quay.io/coreos/etcd:v3.1` to fetch latest v3.1 versions.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-  - Fix panic on `net/http.CloseNotify`
-
-
-<hr>
-
-
-## [v3.1.9](https://github.com/etcd-io/etcd/releases/tag/v3.1.9) (2017-06-09)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.8...v3.1.9) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Allow v2 snapshot over 512MB.
-
-### Go
-
-- Compile with [*Go 1.7.6*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.8](https://github.com/etcd-io/etcd/releases/tag/v3.1.8) (2017-05-19)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.7...v3.1.8) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.7](https://github.com/etcd-io/etcd/releases/tag/v3.1.7) (2017-04-28)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.6...v3.1.7) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.6](https://github.com/etcd-io/etcd/releases/tag/v3.1.6) (2017-04-19)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.5...v3.1.6) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Fill in Auth API response header.
-- Remove auth check in Status API.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.5](https://github.com/etcd-io/etcd/releases/tag/v3.1.5) (2017-03-27)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.4...v3.1.5) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd server
-
-- Fix raft memory leak issue.
-- Fix Windows file path issues.
-
-### Other
-
-- Add `/etc/nsswitch.conf` file to alpine-based Docker image.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.4](https://github.com/etcd-io/etcd/releases/tag/v3.1.4) (2017-03-22)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.3...v3.1.4) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.3](https://github.com/etcd-io/etcd/releases/tag/v3.1.3) (2017-03-10)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.2...v3.1.3) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd gateway
-
-- Fix `etcd gateway` schema handling in DNS discovery.
-- Fix sd_notify behaviors in `gateway`, `grpc-proxy`.
-
-### gRPC Proxy
-
-- Fix sd_notify behaviors in `gateway`, `grpc-proxy`.
-
-### Other
-
-- Use machine default host when advertise URLs are default values(`localhost:2379,2380`) AND if listen URL is `0.0.0.0`.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.2](https://github.com/etcd-io/etcd/releases/tag/v3.1.2) (2017-02-24)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.1...v3.1.2) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### etcd gateway
-
-- Fix `etcd gateway` with multiple endpoints.
-
-### Other
-
-- Use IPv4 default host, by default (when IPv4 and IPv6 are available).
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.1](https://github.com/etcd-io/etcd/releases/tag/v3.1.1) (2017-02-17)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.1.0...v3.1.1) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-
-
-## [v3.1.0](https://github.com/etcd-io/etcd/releases/tag/v3.1.0) (2017-01-20)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.0.0...v3.1.0) and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_1/).**
-
-### Improved
-
-- Faster linearizable reads (implements Raft [read-index](https://github.com/etcd-io/etcd/pull/6212)).
-- v3 authentication API is now stable.
-
-### Breaking Changes
-
-- Deprecated following gRPC metrics in favor of [go-grpc-prometheus](https://github.com/grpc-ecosystem/go-grpc-prometheus).
-  - `etcd_grpc_requests_total`
-  - `etcd_grpc_requests_failed_total`
-  - `etcd_grpc_active_streams`
-  - `etcd_grpc_unary_requests_duration_seconds`
-
-### Dependency
-
-- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go) to [**`ugorji/go@9c7f9b7`**](https://github.com/ugorji/go/commit/9c7f9b7a2bc3a520f7c7b30b34b7f85f47fe27b6), and [regenerate v2 `client`](https://github.com/etcd-io/etcd/pull/6945).
-
-### Security, Authentication
-
-See [security doc](https://etcd.io/docs/latest/op-guide/security/) for more details.
-
-- SRV records (e.g., infra1.example.com) must match the discovery domain (i.e., example.com) if no custom certificate authority is given.
-  - `TLSConfig.ServerName` is ignored with user-provided certificates for backwards compatibility; to be deprecated.
-  - For example, `etcd --discovery-srv=example.com` will only authenticate peers/clients when the provided certs have root domain `example.com` as an entry in Subject Alternative Name (SAN) field.
-
-### etcd server
-
-- Automatic leadership transfer when leader steps down.
-- etcd flags
-  - `--strict-reconfig-check` flag is set by default.
-  - Add `--log-output` flag.
-  - Add `--metrics` flag.
-- etcd uses default route IP if advertise URL is not given.
-- Cluster rejects removing members if quorum will be lost.
-- Discovery now has upper limit for waiting on retries.
-- Warn on binding listeners through domain names; to be deprecated.
-- v3.0 and v3.1 with `--auto-compaction-retention=10` run periodic compaction on v3 key-value store for every 10-hour.
-  - Compactor only supports periodic compaction.
-  - Compactor records latest revisions every 5-minute, until it reaches the first compaction period (e.g. 10-hour).
-  - In order to retain key-value history of last compaction period, it uses the last revision that was fetched before compaction period, from the revision records that were collected every 5-minute.
-  - When `--auto-compaction-retention=10`, compactor uses revision 100 for compact revision where revision 100 is the latest revision fetched from 10 hours ago.
-  - If compaction succeeds or requested revision has already been compacted, it resets period timer and starts over with new historical revision records (e.g. restart revision collect and compact for the next 10-hour period).
-  - If compaction fails, it retries in 5 minutes.
-
-### client v3
-
-- Add `SetEndpoints` method; update endpoints at runtime.
-- Add `Sync` method; auto-update endpoints at runtime.
-- Add `Lease TimeToLive` API; fetch lease information.
-- replace Config.Logger field with global logger.
-- Get API responses are sorted in ascending order by default.
-
-### etcdctl v3
-
-- Add `lease timetolive` command.
-- Add `--print-value-only` flag to get command.
-- Add `--dest-prefix` flag to make-mirror command.
-- `get` command responses are sorted in ascending order by default.
-
-### gRPC Proxy
-
-- Experimental gRPC proxy feature.
-
-### Other
-
-- `recipes` now conform to sessions defined in `clientv3/concurrency`.
-- ACI has symlinks to `/usr/local/bin/etcd*`.
-
-### Go
-
-- Compile with [*Go 1.7.4*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-<hr>
-

CHANGELOG-3.5.md

@@ -1,296 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/etcd/blob/main/CHANGELOG-3.4.md).
-
-
-The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.18+, and 3.4.2+.
-
-
-<hr>
-
-
-## v3.5.0 (2021-06)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.4.0...v3.5.0) and [v3.5 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_5/) for any breaking changes.
-
-- [v3.5.0](https://github.com/etcd-io/etcd/releases/tag/v3.5.0) (2020 TBD), see [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0-rc.1...v3.5.0).
-- [v3.5.0-rc.1](https://github.com/etcd-io/etcd/releases/tag/v3.5.0-rc.1) (2020 TBD), see [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0-rc.0...v3.5.0-rc.1).
-- [v3.5.0-rc.0](https://github.com/etcd-io/etcd/releases/tag/v3.5.0-rc.0) (2020 TBD), see [code changes](https://github.com/etcd-io/etcd/compare/v3.4.0...v3.5.0-rc.0).
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.5 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_3_5/).**
-
-### Breaking Changes
-
-- `go.etcd.io/etcd` Go packages have moved to `go.etcd.io/etcd/{api,pkg,raft,client,etcdctl,server,raft,tests}/v3` to follow the [Go modules](https://github.com/golang/go/wiki/Modules) conventions
-- `go.etcd.io/clientv3/snapshot` SnapshotManager class have moved to `go.etcd.io/clientv3/etcdctl`.
-   The method `snapshot.Save` to download a snapshot from the remote server was preserved in 'go.etcd.io/clientv3/snapshot`.
-- `go.etcd.io/client' package got migrated to 'go.etcd.io/client/v2'.
-- Changed behavior of clienv3 API [MemberList](https://github.com/etcd-io/etcd/pull/11639).
-  - Previously, it is directly served with server's local data, which could be stale.
-  - Now, it is served with linearizable guarantee. If the server is disconnected from quorum, `MemberList` call will fail.
-- [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) only supports [`/v3`](TODO) endpoint.
-  - Deprecated [`/v3beta`](https://github.com/etcd-io/etcd/pull/9298).
-  - `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` does work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- **`etcd --experimental-enable-v2v3` flag remains experimental and to be deprecated.**
-  - v2 storage emulation feature will be deprecated in the next release.
-  - etcd 3.5 is the last version that supports V2 API. Flags `--enable-v2` and `--experimental-enable-v2v3` [are now deprecated](https://github.com/etcd-io/etcd/pull/) and will be removed in etcd v3.6 release.
-- **`etcd --experimental-backend-bbolt-freelist-type` flag has been deprecated.** Use **`etcd --backend-bbolt-freelist-type`** instead. The default type is hashmap and it is stable now.
-- **`etcd --debug` flag has been deprecated.** Use **`etcd --log-level=debug`** instead.
-- Remove [`embed.Config.Debug`](https://github.com/etcd-io/etcd/pull/10947).
-- **`etcd --log-output` flag has been deprecated.** Use **`etcd --log-outputs`** instead.
-- **`etcd --logger=zap --log-outputs=stderr`** is now the default.
-- **`etcd --logger=capnslog` flag value has been deprecated.**
-- **`etcd --logger=zap --log-outputs=default` flag value is not supported.**.
-  - Use `etcd --logger=zap --log-outputs=stderr`.
-  - Or, use `etcd --logger=zap --log-outputs=systemd/journal` to send logs to the local systemd journal.
-  - Previously, if etcd parent process ID (PPID) is 1 (e.g. run with systemd), `etcd --logger=capnslog --log-outputs=default` redirects server logs to local systemd journal. And if write to journald fails, it writes to `os.Stderr` as a fallback.
-  - However, even with PPID 1, it can fail to dial systemd journal (e.g. run embedded etcd with Docker container). Then, [every single log write will fail](https://github.com/etcd-io/etcd/pull/9729) and fall back to `os.Stderr`, which is inefficient.
-  - To avoid this problem, systemd journal logging must be configured manually.
-- **`etcd --log-outputs=stderr`** is now the default.
-- **`etcd --log-package-levels` flag for `capnslog` has been deprecated.** Now, **`etcd --logger=zap --log-outputs=stderr`** is the default.
-- **`[CLIENT-URL]/config/local/log` endpoint has been deprecated, as is `etcd --log-package-levels` flag.**
-  - `curl http://127.0.0.1:2379/config/local/log -XPUT -d '{"Level":"DEBUG"}'` won't work.
-  - Please use `etcd --logger=zap --log-outputs=stderr` instead.
-- Deprecated `etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metric. Use `etcd_mvcc_db_total_size_in_bytes` instead.
-- Deprecated `etcd_debugging_mvcc_put_total` Prometheus metric. Use `etcd_mvcc_put_total` instead.
-- Deprecated `etcd_debugging_mvcc_delete_total` Prometheus metric. Use `etcd_mvcc_delete_total` instead.
-- Deprecated `etcd_debugging_mvcc_txn_total` Prometheus metric. Use `etcd_mvcc_txn_total` instead.
-- Deprecated `etcd_debugging_mvcc_range_total` Prometheus metric. Use `etcd_mvcc_range_total` instead.
-- Main branch `/version` outputs `3.5.0-pre`, instead of `3.4.0+git`.
-- Changed `proxy` package function signature to [support structured logger](https://github.com/etcd-io/etcd/pull/11614).
-  - Previously, `NewClusterProxy(c *clientv3.Client, advaddr string, prefix string) (pb.ClusterServer, <-chan struct{})`, now `NewClusterProxy(lg *zap.Logger, c *clientv3.Client, advaddr string, prefix string) (pb.ClusterServer, <-chan struct{})`.
-  - Previously, `Register(c *clientv3.Client, prefix string, addr string, ttl int)`, now `Register(lg *zap.Logger, c *clientv3.Client, prefix string, addr string, ttl int) <-chan struct{}`.
-  - Previously, `NewHandler(t *http.Transport, urlsFunc GetProxyURLs, failureWait time.Duration, refreshInterval time.Duration) http.Handler`, now `NewHandler(lg *zap.Logger, t *http.Transport, urlsFunc GetProxyURLs, failureWait time.Duration, refreshInterval time.Duration) http.Handler`.
-- Changed `pkg/flags` function signature to [support structured logger](https://github.com/etcd-io/etcd/pull/11616).
-  - Previously, `SetFlagsFromEnv(prefix string, fs *flag.FlagSet) error`, now `SetFlagsFromEnv(lg *zap.Logger, prefix string, fs *flag.FlagSet) error`.
-  - Previously, `SetPflagsFromEnv(prefix string, fs *pflag.FlagSet) error`, now `SetPflagsFromEnv(lg *zap.Logger, prefix string, fs *pflag.FlagSet) error`.
-- ClientV3 supports [grpc resolver API](https://github.com/etcd-io/etcd/blob/main/client/v3/naming/resolver/resolver.go).
-  - Endpoints can be managed using [endpoints.Manager](https://github.com/etcd-io/etcd/blob/main/client/v3/naming/endpoints/endpoints.go)
-  - Previously supported [GRPCResolver was decomissioned](https://github.com/etcd-io/etcd/pull/12675). Use [resolver](https://github.com/etcd-io/etcd/blob/main/client/v3/naming/resolver/resolver.go) instead.
-- Turned on [--pre-vote by default](https://github.com/etcd-io/etcd/pull/12770). Should prevent disrupting RAFT leader by an individual member.
-- [ETCD_CLIENT_DEBUG env](https://github.com/etcd-io/etcd/pull/12786): Now supports log levels (debug, info, warn, error, dpanic, panic, fatal). Only when set, overrides application-wide grpc logging settings.
-- [Embed Etcd.Close()](https://github.com/etcd-io/etcd/pull/12828) needs to called exactly once and closes Etcd.Err() stream.
-- [Embed Etcd does not override global/grpc logger](https://github.com/etcd-io/etcd/pull/12861) be default any longer. If desired, please call `embed.Config::SetupGlobalLoggers()` explicitly. 
-- [Embed Etcd custom logger should be configured using simpler builder `NewZapLoggerBuilder`](https://github.com/etcd-io/etcd/pull/12973).
-- Client errors of `context cancelled` or `context deadline exceeded` are exposed as `codes.Canceled` and `codes.DeadlineExceeded`, instead of `codes.Unknown`.
-
-
-### Storage format changes
-- [WAL log's snapshots persists raftpb.ConfState](https://github.com/etcd-io/etcd/pull/12735)
-- [Backend persists raftpb.ConfState](https://github.com/etcd-io/etcd/pull/12962) in the `meta` bucket `confState` key.
-- [Backend persists applied term](https://github.com/etcd-io/etcd/pull/) in the `meta` bucket.
-- Backend persists `downgrade` in the `cluster` bucket
-
-### Security
-
-- Add [`TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256` and `TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256` to `etcd --cipher-suites`](https://github.com/etcd-io/etcd/pull/11864).
-- Changed [the format of WAL entries related to auth for not keeping password as a plain text](https://github.com/etcd-io/etcd/pull/11943).
-- Add third party [Security Audit Report](https://github.com/etcd-io/etcd/pull/12201).
-- A [log warning](https://github.com/etcd-io/etcd/pull/12242) is added when etcd uses any existing directory that has a permission different than 700 on Linux and 777 on Windows.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.io/docs/latest/metrics/) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Deprecated `etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metric. Use `etcd_mvcc_db_total_size_in_bytes` instead.
-- Deprecated `etcd_debugging_mvcc_put_total` Prometheus metric. Use `etcd_mvcc_put_total` instead.
-- Deprecated `etcd_debugging_mvcc_delete_total` Prometheus metric. Use `etcd_mvcc_delete_total` instead.
-- Deprecated `etcd_debugging_mvcc_txn_total` Prometheus metric. Use `etcd_mvcc_txn_total` instead.
-- Deprecated `etcd_debugging_mvcc_range_total` Prometheus metric. Use `etcd_mvcc_range_total` instead.
-- Add [`etcd_debugging_mvcc_current_revision`](https://github.com/etcd-io/etcd/pull/11126) Prometheus metric.
-- Add [`etcd_debugging_mvcc_compact_revision`](https://github.com/etcd-io/etcd/pull/11126) Prometheus metric.
-- Change [`etcd_cluster_version`](https://github.com/etcd-io/etcd/pull/11254) Prometheus metrics to include only major and minor version.
-- Add [`etcd_debugging_mvcc_total_put_size_in_bytes`](https://github.com/etcd-io/etcd/pull/11374) Prometheus metric.
-- Add [`etcd_server_client_requests_total` with `"type"` and `"client_api_version"` labels](https://github.com/etcd-io/etcd/pull/11687).
-- Add [`etcd_wal_write_bytes_total`](https://github.com/etcd-io/etcd/pull/11738).
-- Add [`etcd_debugging_auth_revision`](https://github.com/etcd-io/etcd/commit/f14d2a087f7b0fd6f7980b95b5e0b945109c95f3).
-- Add [`os_fd_used` and `os_fd_limit` to monitor current OS file descriptors](https://github.com/etcd-io/etcd/pull/12214).
-
-### etcd server
-
-  - Add [`TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256` and `TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256` to `etcd --cipher-suites`](https://github.com/etcd-io/etcd/pull/11864).
-  - Automatically [create parent directory if it does not exist](https://github.com/etcd-io/etcd/pull/9626) (fix [issue#9609](https://github.com/etcd-io/etcd/issues/9609)).
-  - v4.0 will configure `etcd --enable-v2=true --enable-v2v3=/aaa` to enable v2 API server that is backed by **v3 storage**.
-- [`etcd --backend-bbolt-freelist-type`] flag is now stable.
-  - `etcd --experimental-backend-bbolt-freelist-type` has been deprecated.
-- Support [downgrade API](https://github.com/etcd-io/etcd/pull/11715).
-- Deprecate v2 apply on cluster version. [Use v3 request to set cluster version and recover cluster version from v3 backend](https://github.com/etcd-io/etcd/pull/11427).
-- [Fix corruption bug in defrag](https://github.com/etcd-io/etcd/pull/11613).
-- Fix [quorum protection logic when promoting a learner](https://github.com/etcd-io/etcd/pull/11640).
-- Improve [peer corruption checker](https://github.com/etcd-io/etcd/pull/11621) to work when peer mTLS is enabled.
-- Log [`[CLIENT-PORT]/health` check in server side](https://github.com/etcd-io/etcd/pull/11704).
-- Log [successful etcd server-side health check in debug level](https://github.com/etcd-io/etcd/pull/12677).
-- Improve [compaction performance when latest index is greater than 1-million](https://github.com/etcd-io/etcd/pull/11734).
-- [Refactor consistentindex](https://github.com/etcd-io/etcd/pull/11699).
-- [Add log when etcdserver failed to apply command](https://github.com/etcd-io/etcd/pull/11670).
-- Improve [count-only range performance](https://github.com/etcd-io/etcd/pull/11771).
-- Remove [redundant storage restore operation to shorten the startup time](https://github.com/etcd-io/etcd/pull/11779).
-  - With 40 million key test data,it can shorten the startup time from 5 min to 2.5 min.
-- [Fix deadlock bug in mvcc](https://github.com/etcd-io/etcd/pull/11817).
-- Fix [inconsistency between WAL and server snapshot](https://github.com/etcd-io/etcd/pull/11888).
-  - Previously, server restore fails if it had crashed after persisting raft hard state but before saving snapshot.
-  - See https://github.com/etcd-io/etcd/issues/10219 for more.
-  - Add [missing CRC checksum check in WAL validate method otherwise causes panic](https://github.com/etcd-io/etcd/pull/11924).
-  - See https://github.com/etcd-io/etcd/issues/11918.
-- Improve logging around snapshot send and receive.
-- [Push down RangeOptions.limit argv into index tree to reduce memory overhead](https://github.com/etcd-io/etcd/pull/11990).
-- Add [reason field for /health response](https://github.com/etcd-io/etcd/pull/11983).
-- Add [exclude alarms from health check conditionally](https://github.com/etcd-io/etcd/pull/12880).
-- Add [`etcd --unsafe-no-fsync`](https://github.com/etcd-io/etcd/pull/11946) flag.
-  - Setting the flag disables all uses of fsync, which is unsafe and will cause data loss. This flag makes it possible to run an etcd node for testing and development without placing lots of load on the file system.
-- Add [`etcd --auth-token-ttl`](https://github.com/etcd-io/etcd/pull/11980) flag to customize `simpleTokenTTL` settings.
-- Improve [`runtime.FDUsage` call pattern to reduce objects malloc of Memory Usage and CPU Usage](https://github.com/etcd-io/etcd/pull/11986).
-- Improve [mvcc.watchResponse channel Memory Usage](https://github.com/etcd-io/etcd/pull/11987).
-- Log [expensive request info in UnaryInterceptor](https://github.com/etcd-io/etcd/pull/12086).
-- [Fix invalid Go type in etcdserverpb](https://github.com/etcd-io/etcd/pull/12000).
-- [Improve healthcheck by using v3 range request and its corresponding timeout](https://github.com/etcd-io/etcd/pull/12195).
-- Add [`etcd --experimental-watch-progress-notify-interval`](https://github.com/etcd-io/etcd/pull/12216) flag to make watch progress notify interval configurable.
-- Fix [server panic in slow writes warnings](https://github.com/etcd-io/etcd/issues/12197).
-  - Fixed via [PR#12238](https://github.com/etcd-io/etcd/pull/12238).
-- [Fix server panic](https://github.com/etcd-io/etcd/pull/12288) when force-new-cluster flag is enabled in a cluster which had learner node.
-- Add [`etcd --self-signed-cert-validity`](https://github.com/etcd-io/etcd/pull/12429) flag to support setting certificate expiration time.
-  - Notice, certificates generated by etcd are valid for 1 year by default when specifying the auto-tls or peer-auto-tls option.
-- Add [`etcd --experimental-warning-apply-duration`](https://github.com/etcd-io/etcd/pull/12448) flag which allows apply duration threshold to be configurable.
-- Add [`etcd --experimental-memory-mlock`](https://github.com/etcd-io/etcd/pull/TODO) flag which prevents etcd memory pages to be swapped out.
-- Add [`etcd --socket-reuse-port`](https://github.com/etcd-io/etcd/pull/12702) flag
-  - Setting this flag enables `SO_REUSEPORT` which allows rebind of a port already in use. User should take caution when using this flag to ensure flock is properly enforced.
-- Add [`etcd --socket-reuse-address`](https://github.com/etcd-io/etcd/pull/12702) flag
-  - Setting this flag enables `SO_REUSEADDR` which allows binding to an address in `TIME_WAIT` state, improving etcd restart time.
-- Reduce [around 30% memory allocation by logging range response size without marshal](https://github.com/etcd-io/etcd/pull/12871).
-- `ETCD_VERIFY="all"` environment triggers [additional verification of consistency](https://github.com/etcd-io/etcd/pull/) of etcd data-dir files.
-- Add [`etcd --enable-log-rotation`](https://github.com/etcd-io/etcd/pull/12774) boolean flag which enables log rotation if true.
-- Add [`etcd --log-rotation-config-json`](https://github.com/etcd-io/etcd/pull/12774) flag which allows passthrough of JSON config to configure log rotation for a file output target.
-- Add experimental distributed tracing boolean flag [`--experimental-enable-distributed-tracing`](https://github.com/etcd-io/etcd/pull/12919) which enables tracing.
-- Add [`etcd --experimental-distributed-tracing-address`](https://github.com/etcd-io/etcd/pull/12919) string flag which allows configuring the OpenTelemetry collector address.
-- Add [`etcd --experimental-distributed-tracing-service-name`](https://github.com/etcd-io/etcd/pull/12919) string flag which allows changing the default "etcd" service name.
-- Add [`etcd --experimental-distributed-tracing-instance-id`](https://github.com/etcd-io/etcd/pull/12919) string flag which configures an instance ID, which must be unique per etcd instance.
-
-### Package `runtime`
-
-- Optimize [`runtime.FDUsage` by removing unnecessary sorting](https://github.com/etcd-io/etcd/pull/12214).
-
-### Package `embed`
-
-- Remove [`embed.Config.Debug`](https://github.com/etcd-io/etcd/pull/10947).
-  - Use `embed.Config.LogLevel` instead.
-- Add [`embed.Config.ZapLoggerBuilder`](https://github.com/etcd-io/etcd/pull/11147) to allow creating a custom zap logger.
-- Replace [global `*zap.Logger` with etcd server logger object](https://github.com/etcd-io/etcd/pull/12212).
-- Add [`embed.Config.EnableLogRotation`](https://github.com/etcd-io/etcd/pull/12774) which enables log rotation if true.
-- Add [`embed.Config.LogRotationConfigJSON`](https://github.com/etcd-io/etcd/pull/12774) to allow passthrough of JSON config to configure log rotation for a file output target.
-- Add [`embed.Config.ExperimentalEnableDistributedTracing`](https://github.com/etcd-io/etcd/pull/12919) which enables experimental distributed tracing if true.
-- Add [`embed.Config.ExperimentalDistributedTracingAddress`](https://github.com/etcd-io/etcd/pull/12919) which allows overriding default collector address.
-- Add [`embed.Config.ExperimentalDistributedTracingServiceName`](https://github.com/etcd-io/etcd/pull/12919) which allows overriding default "etcd" service name.
-- Add [`embed.Config.ExperimentalDistributedTracingServiceInstanceID`](https://github.com/etcd-io/etcd/pull/12919) which allows configuring an instance ID, which must be uniquer per etcd instance.
-
-### Package `clientv3`
-
-- Remove [excessive watch cancel logging messages](https://github.com/etcd-io/etcd/pull/12187).
-  - See [kubernetes/kubernetes#93450](https://github.com/kubernetes/kubernetes/issues/93450).
-- Add [`TryLock`](https://github.com/etcd-io/etcd/pull/11104) method to `clientv3/concurrency/Mutex`. A non-blocking method on `Mutex` which does not wait to get lock on the Mutex, returns immediately if Mutex is locked by another session.
-- Fix [client balancer failover against multiple endpoints](https://github.com/etcd-io/etcd/pull/11184).
-  - Fix [`"kube-apiserver: failover on multi-member etcd cluster fails certificate check on DNS mismatch"`](https://github.com/kubernetes/kubernetes/issues/83028).
-- Fix [IPv6 endpoint parsing in client](https://github.com/etcd-io/etcd/pull/11211).
-  - Fix ["1.16: etcd client does not parse IPv6 addresses correctly when members are joining" (kubernetes#83550)](https://github.com/kubernetes/kubernetes/issues/83550).
-- Fix [errors caused by grpc changing balancer/resolver API](https://github.com/etcd-io/etcd/pull/11564). This change is compatible with grpc >= [v1.26.0](https://github.com/grpc/grpc-go/releases/tag/v1.26.0), but is not compatible with < v1.26.0 version.
-- Use [ServerName as the authority](https://github.com/etcd-io/etcd/pull/11574) after bumping to grpc v1.26.0. Remove workaround in [#11184](https://github.com/etcd-io/etcd/pull/11184).
-- Fix [`"hasleader"` metadata embedding](https://github.com/etcd-io/etcd/pull/11687).
-  - Previously, `clientv3.WithRequireLeader(ctx)` was overwriting existing context keys.
-- Fix [watch leak caused by lazy cancellation](https://github.com/etcd-io/etcd/pull/11850). When clients cancel their watches, a cancel request will now be immediately sent to the server instead of waiting for the next watch event.
-- Make sure [save snapshot downloads checksum for integrity checks](https://github.com/etcd-io/etcd/pull/11896).
-- Fix [auth token invalid after watch reconnects](https://github.com/etcd-io/etcd/pull/12264). Get AuthToken automatically when clientConn is ready.
-- Improve [clientv3:get AuthToken gracefully without extra connection](https://github.com/etcd-io/etcd/pull/12165).
-- Changed [clientv3 dialing code](https://github.com/etcd-io/etcd/pull/12671) to use grpc resolver API instead of custom balancer.
-  - Endpoints self identify now as `etcd-endpoints://{id}/#initially={list of endpoints}` e.g. `etcd-endpoints://0xc0009d8540/#initially=[localhost:2079]`
-- Make sure [save snapshot downloads checksum for integrity checks](https://github.com/etcd-io/etcd/pull/11896).
-
-### Package `lease`
-
-- Fix [memory leak in follower nodes](https://github.com/etcd-io/etcd/pull/11731).
-  - https://github.com/etcd-io/etcd/issues/11495
-  - https://github.com/etcd-io/etcd/issues/11730
-- Make sure [grant/revoke won't be applied repeatedly after restarting etcd](https://github.com/etcd-io/etcd/pull/11935).
-
-### Package `wal`
-
-- Add [`etcd_wal_write_bytes_total`](https://github.com/etcd-io/etcd/pull/11738).
-- Handle [out-of-range slice bound in `ReadAll` and entry limit in `decodeRecord`](https://github.com/etcd-io/etcd/pull/11793).
-
-### etcdctl v3
-
-- Fix `etcdctl member add` command to prevent potential timeout. ([PR#11194](https://github.com/etcd-io/etcd/pull/11194) and [PR#11638](https://github.com/etcd-io/etcd/pull/11638))
-- Add [`etcdctl watch --progress-notify`](https://github.com/etcd-io/etcd/pull/11462) flag.
-- Add [`etcdctl auth status`](https://github.com/etcd-io/etcd/pull/11536) command to check if authentication is enabled
-- Add [`etcdctl get --count-only`](https://github.com/etcd-io/etcd/pull/11743) flag for output type `fields`.
-- Add [`etcdctl member list -w=json --hex`](https://github.com/etcd-io/etcd/pull/11812) flag to print memberListResponse in hex format json.
-- Changed [`etcdctl lock <lockname> exec-command`](https://github.com/etcd-io/etcd/pull/12829) to return exit code of exec-command.
-- [New tool: `etcdutl`](https://github.com/etcd-io/etcd/pull/12971) incorporated functionality of: `etcdctl snapshot status|restore`, `etcdctl backup`, `etcdctl defrag --data-dir ...`.
-- [ETCDCTL_API=2 `etcdctl migrate`](https://github.com/etcd-io/etcd/pull/12971) has been decomissioned. Use etcd <=v3.4 to restore v2 storage.
-
-### gRPC gateway
-
-- [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) only supports [`/v3`](TODO) endpoint.
-  - Deprecated [`/v3beta`](https://github.com/etcd-io/etcd/pull/9298).
-  - `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` does work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-
-### gRPC Proxy
-
-- Fix [`panic on error`](https://github.com/etcd-io/etcd/pull/11694) for metrics handler.
-- Add [gRPC keepalive related flags](https://github.com/etcd-io/etcd/pull/11711) `grpc-keepalive-min-time`, `grpc-keepalive-interval` and `grpc-keepalive-timeout`.
-- [Fix grpc watch proxy hangs when failed to cancel a watcher](https://github.com/etcd-io/etcd/pull/12030) .
-- Add [metrics handler for grpcproxy self](https://github.com/etcd-io/etcd/pull/12107).
-- Add [health handler for grpcproxy self](https://github.com/etcd-io/etcd/pull/12114).
-
-### Auth
-
-- Fix [NoPassword check when adding user through GRPC gateway](https://github.com/etcd-io/etcd/pull/11418) ([issue#11414](https://github.com/etcd-io/etcd/issues/11414))
-- Fix bug where [some auth related messages are logged at wrong level](https://github.com/etcd-io/etcd/pull/11586)
-- [Fix a data corruption bug by saving consistent index](https://github.com/etcd-io/etcd/pull/11652).
-- [Improve checkPassword performance](https://github.com/etcd-io/etcd/pull/11735).
-- [Add authRevision field in AuthStatus](https://github.com/etcd-io/etcd/pull/11659).
-
-### API
-
-- Add [`/v3/auth/status`](https://github.com/etcd-io/etcd/pull/11536) endpoint to check if authentication is enabled
-- [Add `Linearizable` field to `etcdserverpb.MemberListRequest`](https://github.com/etcd-io/etcd/pull/11639).
-- [Learner support Snapshot RPC](https://github.com/etcd-io/etcd/pull/12890/).
-
-### Package `netutil`
-
-- Remove [`netutil.DropPort/RecoverPort/SetLatency/RemoveLatency`](https://github.com/etcd-io/etcd/pull/12491).
-  - These are not used anymore. They were only used for older versions of functional testing.
-  - Removed to adhere to best security practices, minimize arbitrary shell invocation.
-
-### `tools/etcd-dump-metrics`
-
-- Implement [input validation to prevent arbitrary shell invocation](https://github.com/etcd-io/etcd/pull/12491).
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) from [**`v1.23.0`**](https://github.com/grpc/grpc-go/releases/tag/v1.23.0) to [**`v1.37.0`**](https://github.com/grpc/grpc-go/releases/tag/v1.37.0).
-- Upgrade [`go.uber.org/zap`](https://github.com/uber-go/zap/releases) from [**`v1.14.1`**](https://github.com/uber-go/zap/releases/tag/v1.14.1) to [**`v1.16.0`**](https://github.com/uber-go/zap/releases/tag/v1.16.0).
-
-### Platforms
-
-- etcd now [officially supports `arm64`](https://github.com/etcd-io/etcd/pull/12929).
-  - See https://github.com/etcd-io/etcd/pull/12928 for adding automated tests with `arm64` EC2 instances (Graviton 2).
-  - See https://github.com/etcd-io/website/pull/273 for new platform support tier policies.
-
-### Release
-
-- Add s390x build support ([PR#11548](https://github.com/etcd-io/etcd/pull/11548) and [PR#11358](https://github.com/etcd-io/etcd/pull/11358))
-
-### Go
-
-- Require [*Go 1.16+*](https://github.com/etcd-io/etcd/pull/11110).
-- Compile with [*Go 1.16+*](https://golang.org/doc/devel/release.html#go1.16)
-- etcd uses [go modules](https://github.com/etcd-io/etcd/pull/12279) (instead of vendor dir) to track dependencies.
-
-### Project Governance
-
-- The etcd team has added, a well defined and openly discussed, project [governance](https://github.com/etcd-io/etcd/pull/11175).
-
-
-<hr>
-

CHANGELOG-4.0.md

@@ -1,53 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.x](https://github.com/etcd-io/etcd/blob/main/CHANGELOG-3.x.md).
-
-
-The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.18+, and 3.4.2+.
-
-
-<hr>
-
-
-## v4.0.0 (TBD)
-
-See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v4.0.0) and [v4.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_4_0/) for any breaking changes.
-
-**Again, before running upgrades from any previous release, please make sure to read change logs below and [v4.0 upgrade guide](https://etcd.io/docs/latest/upgrades/upgrade_4_0/).**
-
-### Breaking Changes
-
-- [Secure etcd by default](https://github.com/etcd-io/etcd/issues/9475)?
-- Change `/health` endpoint output.
-  - Previously, `{"health":"true"}`.
-  - Now, `{"health":true}`.
-  - Breaks [Kubernetes `kubectl get componentstatuses` command](https://github.com/kubernetes/kubernetes/issues/58240).
-- Deprecate [`etcd --proxy*`](TODO) flags; **no more v2 proxy**.
-- Deprecate [v2 storage backend](https://github.com/etcd-io/etcd/issues/9232); **no more v2 store**.
-  - v2 API is still supported via [v2 emulation](TODO).
-- Deprecate [`etcdctl backup`](TODO) command.
-- `clientv3.Client.KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAliveResponse, error)` is now [`clientv4.Client.KeepAlive(ctx context.Context, id LeaseID) <-chan *LeaseKeepAliveResponse`](TODO).
-  - Similar to `Watch`, [`KeepAlive` does not return errors](https://github.com/etcd-io/etcd/issues/7488).
-  - If there's an unknown server error, kill all open channels and create a new stream on the next `KeepAlive` call.
-- Rename `github.com/coreos/client` to `github.com/coreos/clientv2`.
-- [`etcd --experimental-initial-corrupt-check`](TODO) has been  deprecated.
-  - Use [`etcd --initial-corrupt-check`](TODO) instead.
-- [`etcd --experimental-corrupt-check-time`](TODO) has been  deprecated.
-  - Use [`etcd --corrupt-check-time`](TODO) instead.
-- Enable TLS 1.13, deprecate TLS cipher suites.
-
-### etcd server
-
-- [`etcd --initial-corrupt-check`](TODO) flag is now stable (`etcd --experimental-initial-corrupt-check` has been  deprecated).
-  - `etcd --initial-corrupt-check=true` by default, to check cluster database hashes before serving client/peer traffic.
-- [`etcd --corrupt-check-time`](TODO) flag is now stable (`etcd --experimental-corrupt-check-time` has been  deprecated).
-  - `etcd --corrupt-check-time=12h` by default, to check cluster database hashes for every 12-hour.
-- Enable TLS 1.13, deprecate TLS cipher suites.
-
-### Go
-
-- Require [*Go 2*](https://blog.golang.org/go2draft).
-
-
-<hr>
-

Dockerfile-release.amd64

@@ -1,16 +1,11 @@
-FROM k8s.gcr.io/build-image/debian-base:buster-v1.4.0
+FROM --platform=linux/amd64 gcr.io/distroless/static-debian11@sha256:9be3fcc6abeaf985b5ecce59451acbcbb15e7be39472320c538d0d55a0834edc
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-RUN mkdir -p /var/etcd/
-RUN mkdir -p /var/lib/etcd/
 
-# Alpine Linux doesn't use pam, which means that there is no /etc/nsswitch.conf,
-# but Golang relies on /etc/nsswitch.conf to check the order of DNS resolving
-# (see https://github.com/golang/go/commit/9dee7771f561cf6aee081c0af6658cc81fac3918)
-# To fix this we just create /etc/nsswitch.conf and add the following line:
-RUN echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Dockerfile-release.arm64

@@ -1,11 +1,11 @@
-FROM k8s.gcr.io/build-image/debian-base-arm64:buster-v1.4.0
+FROM --platform=linux/arm64 gcr.io/distroless/static-debian11@sha256:9be3fcc6abeaf985b5ecce59451acbcbb15e7be39472320c538d0d55a0834edc
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
-ENV ETCD_UNSUPPORTED_ARCH=arm64
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Dockerfile-release.ppc64le

@@ -1,10 +1,11 @@
-FROM k8s.gcr.io/build-image/debian-base-ppc64le:buster-v1.4.0
+FROM --platform=linux/ppc64le gcr.io/distroless/static-debian11@sha256:9be3fcc6abeaf985b5ecce59451acbcbb15e7be39472320c538d0d55a0834edc
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Dockerfile-release.s390x

@@ -1,10 +1,11 @@
-FROM k8s.gcr.io/build-image/debian-base-s390x:buster-v1.4.0
+FROM --platform=linux/s390x gcr.io/distroless/static-debian11@sha256:9be3fcc6abeaf985b5ecce59451acbcbb15e7be39472320c538d0d55a0834edc
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/
 ADD etcdutl /usr/local/bin/
-ADD var/etcd /var/etcd
-ADD var/lib/etcd /var/lib/etcd
+
+WORKDIR /var/etcd/
+WORKDIR /var/lib/etcd/
 
 EXPOSE 2379 2380
 

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -1276,6 +1276,39 @@
       }
     },
     "/v3/maintenance/hash": {
+      "post": {
+        "tags": [
+          "Maintenance"
+        ],
+        "summary": "Hash computes the hash of whole backend keyspace,\nincluding key, lease, and other buckets in storage.\nThis is designed for testing ONLY!\nDo not rely on this in production with ongoing transactions,\nsince Hash operation does not hold MVCC locks.\nUse \"HashKV\" API instead for \"key\" bucket consistency checks.",
+        "operationId": "Maintenance_Hash",
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbHashRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbHashResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response",
+            "schema": {
+              "$ref": "#/definitions/runtimeError"
+            }
+          }
+        }
+      }
+    },
+    "/v3/maintenance/hashkv": {
       "post": {
         "tags": [
           "Maintenance"

Makefile

@@ -55,7 +55,7 @@ docker-remove:
 
 
 
-GO_VERSION ?= 1.16.3
+GO_VERSION ?= $(shell cat .go-version)
 ETCD_VERSION ?= $(shell git rev-parse --short HEAD || echo "GitNotFound")
 
 TEST_SUFFIX = $(shell date +%s | base64 | head -c 15)
@@ -161,7 +161,26 @@ test-full:
 	$(info log-file: test-$(TEST_SUFFIX).log)
 	PASSES="fmt build release unit integration functional e2e grpcproxy" ./test.sh 2<&1 | tee test-$(TEST_SUFFIX).log
 
-docker-test:
+.PHONY: test-unit
+test-unit:
+	PASSES="unit" ./test.sh $(GO_TEST_FLAGS)
+
+.PHONY: test-integration
+test-integration:
+	PASSES="integration" ./test.sh $(GO_TEST_FLAGS)
+
+.PHONY: test-e2e
+test-e2e:
+	PASSES="build e2e" ./test.sh $(GO_TEST_FLAGS)
+
+.PHONY: test-e2e-release
+test-e2e-release:
+	PASSES="build release e2e" ./test.sh $(GO_TEST_FLAGS)
+
+ensure-docker-test-image-exists:
+	make pull-docker-test || ( echo "WARNING: Container Image not found in registry, building locally"; make build-docker-test )
+
+docker-test: ensure-docker-test-image-exists
 	$(info GO_VERSION: $(GO_VERSION))
 	$(info ETCD_VERSION: $(ETCD_VERSION))
 	$(info TEST_OPTS: $(TEST_OPTS))
@@ -546,3 +565,9 @@ pull-docker-functional:
 	$(info GO_VERSION: $(GO_VERSION))
 	$(info ETCD_VERSION: $(ETCD_VERSION))
 	docker pull gcr.io/etcd-development/etcd-functional:go$(GO_VERSION)
+
+# Failpoints
+GOFAIL_VERSION = $(shell cd tools/mod && go list -m -f {{.Version}} go.etcd.io/gofail)
+.PHONY: install-gofail
+install-gofail:
+	go install go.etcd.io/gofail@${GOFAIL_VERSION}

api/etcdserverpb/gw/rpc.pb.gw.go

@@ -3290,7 +3290,7 @@ var (
 
 	pattern_Maintenance_Hash_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v3", "maintenance", "hash"}, "", runtime.AssumeColonVerbOpt(true)))
 
-	pattern_Maintenance_HashKV_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v3", "maintenance", "hash"}, "", runtime.AssumeColonVerbOpt(true)))
+	pattern_Maintenance_HashKV_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v3", "maintenance", "hashkv"}, "", runtime.AssumeColonVerbOpt(true)))
 
 	pattern_Maintenance_Snapshot_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v3", "maintenance", "snapshot"}, "", runtime.AssumeColonVerbOpt(true)))
 

api/etcdserverpb/raft_internal_stringer_test.go

@@ -20,7 +20,7 @@ import (
 	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
 )
 
-// TestInvalidGoYypeIntPanic tests conditions that caused
+// TestInvalidGoTypeIntPanic tests conditions that caused
 // panic: invalid Go type int for field k8s_io.kubernetes.vendor.go_etcd_io.etcd.etcdserver.etcdserverpb.loggablePutRequest.value_size
 // See https://github.com/kubernetes/kubernetes/issues/91937 for more details
 func TestInvalidGoTypeIntPanic(t *testing.T) {

api/etcdserverpb/rpc.pb.go

@@ -6154,264 +6154,264 @@ func init() {
 func init() { proto.RegisterFile("rpc.proto", fileDescriptor_77a6da22d6a3feb1) }
 
 var fileDescriptor_77a6da22d6a3feb1 = []byte{
-	// 4107 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xbc, 0x5b, 0x5b, 0x73, 0x1b, 0xc9,
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-	0xc9, 0x1d, 0x42, 0xda, 0x4b, 0xb9, 0xc2, 0x1a, 0x02, 0x2d, 0x72, 0x42, 0x60, 0x06, 0x9e, 0x19,
-	0x40, 0xe4, 0xe6, 0xe2, 0x94, 0xcb, 0x71, 0x25, 0xaf, 0x76, 0x55, 0x2a, 0x79, 0x48, 0x5e, 0x52,
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+	0xb4, 0xe2, 0x4f, 0xf3, 0x66, 0x7a, 0x67, 0xda, 0x5e, 0x56, 0x61, 0x7c, 0xc6, 0x47, 0x71, 0x26,
+	0x00, 0x51, 0x8d, 0x3d, 0xbe, 0xa2, 0x89, 0x92, 0x7c, 0x73, 0x2d, 0x9b, 0x21, 0xcd, 0xa6, 0x2a,
+	0x66, 0x3f, 0xe4, 0xa5, 0xb8, 0x7f, 0x0a, 0xb3, 0x4f, 0x2c, 0xff, 0x0c, 0xc5, 0x62, 0xaf, 0xf2,
+	0xad, 0x58, 0xb3, 0x99, 0xd6, 0x25, 0x50, 0x6e, 0x33, 0x94, 0x1b, 0xdc, 0x95, 0xa9, 0x28, 0x67,
+	0x96, 0x7f, 0x26, 0xec, 0xc7, 0x3f, 0x1d, 0x8b, 0xdb, 0x4f, 0xfb, 0xfc, 0x2c, 0x6e, 0x3f, 0xfd,
+	0x6b, 0xb3, 0x6c, 0xfb, 0x51, 0x94, 0xf3, 0x09, 0xc5, 0x19, 0x41, 0x51, 0x7e, 0xad, 0x85, 0x62,
+	0x4f, 0xf7, 0xb1, 0x2f, 0xbb, 0x9a, 0xab, 0x59, 0xdd, 0x02, 0xed, 0x0e, 0x43, 0xbb, 0x85, 0x1b,
+	0x89, 0xd5, 0x12, 0x9c, 0x0f, 0x8d, 0xfb, 0xef, 0x1b, 0xe8, 0x47, 0x00, 0xd1, 0xc3, 0x44, 0xe2,
+	0x0c, 0xc6, 0xdf, 0x38, 0x12, 0x67, 0x30, 0xf1, 0xa6, 0x81, 0x37, 0x18, 0xee, 0x3a, 0xbe, 0x13,
+	0xc7, 0x0d, 0x3c, 0xcb, 0xf1, 0x5f, 0x10, 0xef, 0x3d, 0x5e, 0x67, 0xf5, 0xcf, 0xec, 0x11, 0x9d,
+	0xb2, 0x07, 0xa5, 0xb0, 0xee, 0x1c, 0xf7, 0xb7, 0xf1, 0x7a, 0x78, 0xdc, 0xdf, 0x26, 0x0a, 0xd6,
+	0xba, 0xe3, 0xd1, 0xf6, 0x8b, 0x64, 0xa5, 0x47, 0xf0, 0x97, 0x75, 0x98, 0xa5, 0x79, 0x37, 0x4d,
+	0x4f, 0xa2, 0xca, 0x49, 0x7c, 0xf6, 0x89, 0x3a, 0x6a, 0x7c, 0xf6, 0xc9, 0xa2, 0x8b, 0x9e, 0x9e,
+	0xd0, 0x6b, 0x56, 0x8b, 0x17, 0x29, 0xe8, 0x4c, 0x5d, 0x28, 0x2b, 0xa5, 0x15, 0x94, 0x22, 0x4c,
+	0x2f, 0xd0, 0xc6, 0x03, 0x5e, 0x4a, 0x5d, 0x06, 0xbf, 0xc1, 0xf0, 0xae, 0xf1, 0x80, 0xc7, 0xf0,
+	0xfa, 0x9c, 0x83, 0x02, 0x8a, 0xd9, 0x89, 0x93, 0x9f, 0x32, 0x3b, 0xfd, 0xf4, 0xaf, 0x65, 0x33,
+	0x64, 0xce, 0x2e, 0x3a, 0xfa, 0x2f, 0xa1, 0xa2, 0x16, 0x58, 0x50, 0x8a, 0xf2, 0xb1, 0xa2, 0x72,
+	0x3c, 0x92, 0xa4, 0xd5, 0x67, 0x74, 0xdf, 0xc6, 0x20, 0x2d, 0x85, 0x8d, 0x02, 0x0f, 0xa0, 0x20,
+	0x2a, 0x2e, 0x69, 0x26, 0xd5, 0x0b, 0xd0, 0x69, 0x26, 0x8d, 0x95, 0x6b, 0xf4, 0xfc, 0x99, 0x21,
+	0xd2, 0x4b, 0xa5, 0x8c, 0xd6, 0x02, 0xed, 0x31, 0x09, 0xb2, 0xd0, 0xa2, 0x5a, 0x66, 0x16, 0x9a,
+	0x72, 0xa1, 0xcf, 0x42, 0x3b, 0x25, 0x81, 0xf0, 0x07, 0xf2, 0xa2, 0x8c, 0x32, 0x84, 0xa9, 0x11,
+	0x12, 0x5f, 0xc5, 0x92, 0x76, 0xbd, 0x89, 0x00, 0x65, 0x78, 0xbc, 0x00, 0x88, 0xea, 0x41, 0xf1,
+	0x9c, 0x35, 0xb5, 0x0e, 0x1e, 0xcf, 0x59, 0xd3, 0x4b, 0x4a, 0xba, 0x8f, 0x8d, 0x70, 0xf9, 0xed,
+	0x8a, 0x22, 0xff, 0xdc, 0x00, 0x94, 0x2c, 0x1d, 0xa1, 0x07, 0xe9, 0xd2, 0x53, 0xab, 0xeb, 0xcd,
+	0x77, 0x5f, 0x8f, 0x39, 0xcd, 0x21, 0x47, 0x2a, 0xf5, 0x18, 0xf7, 0xe8, 0x25, 0x55, 0xea, 0xc7,
+	0x06, 0x54, 0xb5, 0xba, 0x13, 0xba, 0x97, 0xb1, 0xa6, 0xb1, 0xa2, 0x7b, 0xf3, 0xed, 0x57, 0xf2,
+	0xa5, 0x25, 0xf3, 0xca, 0x0e, 0x90, 0xb7, 0x9a, 0x9f, 0x1a, 0x50, 0xd3, 0xeb, 0x54, 0x28, 0x43,
+	0x76, 0xa2, 0x68, 0xdf, 0x5c, 0x7f, 0x35, 0xe3, 0xd5, 0xcb, 0x13, 0x5d, 0x68, 0x06, 0x50, 0x10,
+	0x95, 0xad, 0xb4, 0x8d, 0xaf, 0x97, 0xfb, 0xd3, 0x36, 0x7e, 0xac, 0x2c, 0x96, 0xb2, 0xf1, 0x3d,
+	0x77, 0x40, 0x94, 0x63, 0x26, 0x4a, 0x5f, 0x59, 0x68, 0x57, 0x1f, 0xb3, 0x58, 0xdd, 0x2c, 0x0b,
+	0x2d, 0x3a, 0x66, 0xb2, 0xe6, 0x85, 0x32, 0x84, 0xbd, 0xe2, 0x98, 0xc5, 0x4b, 0x66, 0x29, 0xc7,
+	0x8c, 0x01, 0x2a, 0xc7, 0x2c, 0xaa, 0x4e, 0xa5, 0x1d, 0xb3, 0xc4, 0xeb, 0x45, 0xda, 0x31, 0x4b,
+	0x16, 0xb8, 0x52, 0xd6, 0x91, 0xe1, 0x6a, 0xc7, 0x6c, 0x29, 0xa5, 0x90, 0x85, 0xde, 0xcd, 0x30,
+	0x62, 0xea, 0xa3, 0x48, 0xf3, 0xbd, 0xd7, 0xe4, 0xce, 0xdc, 0xe3, 0xdc, 0xfc, 0x72, 0x8f, 0xff,
+	0x9d, 0x01, 0xcb, 0x69, 0x45, 0x30, 0x94, 0x81, 0x93, 0xf1, 0x98, 0xd2, 0xdc, 0x78, 0x5d, 0xf6,
+	0xab, 0xad, 0x15, 0xee, 0xfa, 0x47, 0xf5, 0x7f, 0xfb, 0x72, 0xd5, 0xf8, 0xcf, 0x2f, 0x57, 0x8d,
+	0xff, 0xf9, 0x72, 0xd5, 0xf8, 0xfb, 0xff, 0x5d, 0x9d, 0x39, 0x99, 0x67, 0xff, 0xd5, 0xf8, 0xdb,
+	0xbf, 0x0d, 0x00, 0x00, 0xff, 0xff, 0x8b, 0x54, 0x11, 0xdf, 0xef, 0x3c, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.

api/etcdserverpb/rpc.proto

@@ -217,7 +217,7 @@ service Maintenance {
   // It only iterates "key" bucket in backend storage.
   rpc HashKV(HashKVRequest) returns (HashKVResponse) {
       option (google.api.http) = {
-        post: "/v3/maintenance/hash"
+        post: "/v3/maintenance/hashkv"
         body: "*"
     };
   }

api/go.mod

@@ -1,14 +1,24 @@
 module go.etcd.io/etcd/api/v3
 
-go 1.16
+go 1.20
 
 require (
 	github.com/coreos/go-semver v0.3.0
 	github.com/gogo/protobuf v1.3.2
-	github.com/golang/protobuf v1.5.2
+	github.com/golang/protobuf v1.5.3
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
-	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
-	google.golang.org/grpc v1.37.0
+	google.golang.org/genproto/googleapis/api v0.0.0-20230822172742-b8732ec3820d
+	google.golang.org/grpc v1.59.0
+)
+
+require (
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
 // Bad imports are sometimes causing attempts to pull that code.

api/go.sum

@@ -5,14 +5,11 @@ github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kd
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
-github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
@@ -22,33 +19,20 @@ github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
-github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
-github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
-github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
-github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
-github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0 h1:gmcG1KaJ57LophUzW0Hy8NmPhnMZb4M0+kPpLofRdBo=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -69,8 +53,9 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20201021035429-f5854403a974 h1:IX6qOQeG5uLjB/hjjwjedwfjND0hgjPMMyO1RoIXQNI=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -83,11 +68,13 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
@@ -99,37 +86,32 @@ golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 h1:+kGHl1aib/qcwaRi1CbqBZ1rk19r85MNUf8HaBghugY=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
+google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d h1:VBu5YqKPv6XiJ199exd8Br+Aetz+o08F+PLMnwJQHAY=
+google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d/go.mod h1:yZTlhN0tQnXo3h00fuXNCxJdLdIdnVFVBaRJ5LWBbw4=
+google.golang.org/genproto/googleapis/api v0.0.0-20230822172742-b8732ec3820d h1:DoPTO70H+bcDXcd39vOqb2viZxgqeBeSGtZ55yZU4/Q=
+google.golang.org/genproto/googleapis/api v0.0.0-20230822172742-b8732ec3820d/go.mod h1:KjSP20unUpOx5kyQUFa7k4OJg0qeJ7DEZflGDu2p6Bk=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d h1:uvYuEyMHKNt+lT4K3bN6fGswmK8qSvcreM3BwjDh+y4=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d/go.mod h1:+Bk1OCOj40wS2hwAMA+aCW9ypzm63QTBBHp6lQ3p+9M=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.37.0 h1:uSZWeQJX5j11bIQ4AJoj+McDBo29cY1MCoC1wO3ts+c=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/grpc v1.59.0 h1:Z5Iec2pjwb+LEOqzpB2MR12/eKFhDPhuqW91O+4bwUk=
+google.golang.org/grpc v1.59.0/go.mod h1:aUPDwccQo6OTjy7Hct4AfBPD1GptF4fyUjIkQ9YtF98=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3 h1:fvjTMHxHEw/mxHbtzPi3JCcKXQRAnQTBRo6YCJSVHKI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

api/v3rpc/rpctypes/error.go

@@ -45,6 +45,7 @@ var (
 	ErrGRPCMemberNotLearner       = status.New(codes.FailedPrecondition, "etcdserver: can only promote a learner member").Err()
 	ErrGRPCLearnerNotReady        = status.New(codes.FailedPrecondition, "etcdserver: can only promote a learner member which is in sync with leader").Err()
 	ErrGRPCTooManyLearners        = status.New(codes.FailedPrecondition, "etcdserver: too many learner members in cluster").Err()
+	ErrGRPCClusterIdMismatch      = status.New(codes.FailedPrecondition, "etcdserver: cluster ID mismatch").Err()
 
 	ErrGRPCRequestTooLarge        = status.New(codes.InvalidArgument, "etcdserver: request is too large").Err()
 	ErrGRPCRequestTooManyRequests = status.New(codes.ResourceExhausted, "etcdserver: too many requests").Err()
@@ -58,12 +59,14 @@ var (
 	ErrGRPCRoleNotFound         = status.New(codes.FailedPrecondition, "etcdserver: role name not found").Err()
 	ErrGRPCRoleEmpty            = status.New(codes.InvalidArgument, "etcdserver: role name is empty").Err()
 	ErrGRPCAuthFailed           = status.New(codes.InvalidArgument, "etcdserver: authentication failed, invalid user ID or password").Err()
+	ErrGRPCPermissionNotGiven   = status.New(codes.InvalidArgument, "etcdserver: permission not given").Err()
 	ErrGRPCPermissionDenied     = status.New(codes.PermissionDenied, "etcdserver: permission denied").Err()
 	ErrGRPCRoleNotGranted       = status.New(codes.FailedPrecondition, "etcdserver: role is not granted to the user").Err()
 	ErrGRPCPermissionNotGranted = status.New(codes.FailedPrecondition, "etcdserver: permission is not granted to the role").Err()
 	ErrGRPCAuthNotEnabled       = status.New(codes.FailedPrecondition, "etcdserver: authentication is not enabled").Err()
 	ErrGRPCInvalidAuthToken     = status.New(codes.Unauthenticated, "etcdserver: invalid auth token").Err()
 	ErrGRPCInvalidAuthMgmt      = status.New(codes.InvalidArgument, "etcdserver: invalid auth management").Err()
+	ErrGRPCAuthOldRevision      = status.New(codes.InvalidArgument, "etcdserver: revision of auth store is old").Err()
 
 	ErrGRPCNoLeader                   = status.New(codes.Unavailable, "etcdserver: no leader").Err()
 	ErrGRPCNotLeader                  = status.New(codes.FailedPrecondition, "etcdserver: not leader").Err()
@@ -73,6 +76,7 @@ var (
 	ErrGRPCTimeout                    = status.New(codes.Unavailable, "etcdserver: request timed out").Err()
 	ErrGRPCTimeoutDueToLeaderFail     = status.New(codes.Unavailable, "etcdserver: request timed out, possibly due to previous leader failure").Err()
 	ErrGRPCTimeoutDueToConnectionLost = status.New(codes.Unavailable, "etcdserver: request timed out, possibly due to connection lost").Err()
+	ErrGRPCTimeoutWaitAppliedIndex    = status.New(codes.Unavailable, "etcdserver: request timed out, waiting for the applied index took too long").Err()
 	ErrGRPCUnhealthy                  = status.New(codes.Unavailable, "etcdserver: unhealthy cluster").Err()
 	ErrGRPCCorrupt                    = status.New(codes.DataLoss, "etcdserver: corrupt cluster").Err()
 	ErrGPRCNotSupportedForLearner     = status.New(codes.Unavailable, "etcdserver: rpc not supported for learner").Err()
@@ -111,6 +115,7 @@ var (
 		ErrorDesc(ErrGRPCMemberNotLearner):       ErrGRPCMemberNotLearner,
 		ErrorDesc(ErrGRPCLearnerNotReady):        ErrGRPCLearnerNotReady,
 		ErrorDesc(ErrGRPCTooManyLearners):        ErrGRPCTooManyLearners,
+		ErrorDesc(ErrGRPCClusterIdMismatch):      ErrGRPCClusterIdMismatch,
 
 		ErrorDesc(ErrGRPCRequestTooLarge):        ErrGRPCRequestTooLarge,
 		ErrorDesc(ErrGRPCRequestTooManyRequests): ErrGRPCRequestTooManyRequests,
@@ -130,6 +135,7 @@ var (
 		ErrorDesc(ErrGRPCAuthNotEnabled):       ErrGRPCAuthNotEnabled,
 		ErrorDesc(ErrGRPCInvalidAuthToken):     ErrGRPCInvalidAuthToken,
 		ErrorDesc(ErrGRPCInvalidAuthMgmt):      ErrGRPCInvalidAuthMgmt,
+		ErrorDesc(ErrGRPCAuthOldRevision):      ErrGRPCAuthOldRevision,
 
 		ErrorDesc(ErrGRPCNoLeader):                   ErrGRPCNoLeader,
 		ErrorDesc(ErrGRPCNotLeader):                  ErrGRPCNotLeader,
@@ -194,7 +200,9 @@ var (
 	ErrPermissionNotGranted = Error(ErrGRPCPermissionNotGranted)
 	ErrAuthNotEnabled       = Error(ErrGRPCAuthNotEnabled)
 	ErrInvalidAuthToken     = Error(ErrGRPCInvalidAuthToken)
+	ErrAuthOldRevision      = Error(ErrGRPCAuthOldRevision)
 	ErrInvalidAuthMgmt      = Error(ErrGRPCInvalidAuthMgmt)
+	ErrClusterIdMismatch    = Error(ErrGRPCClusterIdMismatch)
 
 	ErrNoLeader                   = Error(ErrGRPCNoLeader)
 	ErrNotLeader                  = Error(ErrGRPCNotLeader)
@@ -204,6 +212,7 @@ var (
 	ErrTimeout                    = Error(ErrGRPCTimeout)
 	ErrTimeoutDueToLeaderFail     = Error(ErrGRPCTimeoutDueToLeaderFail)
 	ErrTimeoutDueToConnectionLost = Error(ErrGRPCTimeoutDueToConnectionLost)
+	ErrTimeoutWaitAppliedIndex    = Error(ErrGRPCTimeoutWaitAppliedIndex)
 	ErrUnhealthy                  = Error(ErrGRPCUnhealthy)
 	ErrCorrupt                    = Error(ErrGRPCCorrupt)
 	ErrBadLeaderTransferee        = Error(ErrGRPCBadLeaderTransferee)

api/version/version.go

@@ -26,7 +26,7 @@ import (
 var (
 	// MinClusterVersion is the min cluster version this etcd binary is compatible with.
 	MinClusterVersion = "3.0.0"
-	Version           = "3.5.0-alpha.0"
+	Version           = "3.5.12"
 	APIVersion        = "unknown"
 
 	// Git SHA Value will be set during build

bill-of-materials.json

@@ -18,10 +18,10 @@
 		]
 	},
 	{
-		"project": "github.com/certifi/gocertifi",
+		"project": "github.com/cenkalti/backoff/v4",
 		"licenses": [
 			{
-				"type": "Mozilla Public License 2.0",
+				"type": "MIT License",
 				"confidence": 1
 			}
 		]
@@ -44,24 +44,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/cockroachdb/errors",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
-	{
-		"project": "github.com/cockroachdb/logtags",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "github.com/coreos/go-semver/semver",
 		"licenses": [
@@ -126,20 +108,20 @@
 		]
 	},
 	{
-		"project": "github.com/form3tech-oss/jwt-go",
+		"project": "github.com/go-logr/logr",
 		"licenses": [
 			{
-				"type": "MIT License",
-				"confidence": 0.9891304347826086
+				"type": "Apache License 2.0",
+				"confidence": 1
 			}
 		]
 	},
 	{
-		"project": "github.com/getsentry/raven-go",
+		"project": "github.com/go-logr/stdr",
 		"licenses": [
 			{
-				"type": "BSD 3-clause \"New\" or \"Revised\" License",
-				"confidence": 0.9663865546218487
+				"type": "Apache License 2.0",
+				"confidence": 1
 			}
 		]
 	},
@@ -152,6 +134,15 @@
 			}
 		]
 	},
+	{
+		"project": "github.com/golang-jwt/jwt/v4",
+		"licenses": [
+			{
+				"type": "MIT License",
+				"confidence": 0.9891304347826086
+			}
+		]
+	},
 	{
 		"project": "github.com/golang/groupcache/lru",
 		"licenses": [
@@ -215,6 +206,15 @@
 			}
 		]
 	},
+	{
+		"project": "github.com/grpc-ecosystem/grpc-gateway/v2",
+		"licenses": [
+			{
+				"type": "BSD 3-clause \"New\" or \"Revised\" License",
+				"confidence": 0.979253112033195
+			}
+		]
+	},
 	{
 		"project": "github.com/inconshreveable/mousetrap",
 		"licenses": [
@@ -287,15 +287,6 @@
 			}
 		]
 	},
-	{
-		"project": "github.com/pkg/errors",
-		"licenses": [
-			{
-				"type": "BSD 2-clause \"Simplified\" License",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "github.com/pmezard/go-difflib/difflib",
 		"licenses": [
@@ -539,15 +530,6 @@
 			}
 		]
 	},
-	{
-		"project": "go.opentelemetry.io/contrib",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc",
 		"licenses": [
@@ -567,7 +549,16 @@
 		]
 	},
 	{
-		"project": "go.opentelemetry.io/otel/exporters/otlp",
+		"project": "go.opentelemetry.io/otel/exporters/otlp/otlptrace",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
+				"confidence": 1
+			}
+		]
+	},
+	{
+		"project": "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc",
 		"licenses": [
 			{
 				"type": "Apache License 2.0",
@@ -593,24 +584,6 @@
 			}
 		]
 	},
-	{
-		"project": "go.opentelemetry.io/otel/sdk/export/metric",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
-	{
-		"project": "go.opentelemetry.io/otel/sdk/metric",
-		"licenses": [
-			{
-				"type": "Apache License 2.0",
-				"confidence": 1
-			}
-		]
-	},
 	{
 		"project": "go.opentelemetry.io/otel/trace",
 		"licenses": [
@@ -675,7 +648,16 @@
 		]
 	},
 	{
-		"project": "golang.org/x/sys",
+		"project": "golang.org/x/sync/errgroup",
+		"licenses": [
+			{
+				"type": "BSD 3-clause \"New\" or \"Revised\" License",
+				"confidence": 0.9663865546218487
+			}
+		]
+	},
+	{
+		"project": "golang.org/x/sys/unix",
 		"licenses": [
 			{
 				"type": "BSD 3-clause \"New\" or \"Revised\" License",
@@ -702,7 +684,25 @@
 		]
 	},
 	{
-		"project": "google.golang.org/genproto",
+		"project": "google.golang.org/genproto/googleapis/api",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
+				"confidence": 1
+			}
+		]
+	},
+	{
+		"project": "google.golang.org/genproto/googleapis/rpc",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
+				"confidence": 1
+			}
+		]
+	},
+	{
+		"project": "google.golang.org/genproto/protobuf/field_mask",
 		"licenses": [
 			{
 				"type": "Apache License 2.0",

build

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 echo -e "\\e[91mDEPRECATED!!! Use build.sh script instead.\\e[0m\\n"
 sleep 1
 

build.sh

@@ -1,24 +1,46 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 source ./scripts/test_lib.sh
 
 GIT_SHA=$(git rev-parse --short HEAD || echo "GitNotFound")
-if [[ -n "$FAILPOINTS" ]]; then
+if [[ -n "${FAILPOINTS:-}" ]]; then
   GIT_SHA="$GIT_SHA"-FAILPOINTS
 fi
 
 VERSION_SYMBOL="${ROOT_MODULE}/api/v3/version.GitSHA"
 
+# use go env if noset
+GOOS=${GOOS:-$(go env GOOS)}
+GOARCH=${GOARCH:-$(go env GOARCH)}
+
 # Set GO_LDFLAGS="-s" for building without symbols for debugging.
 # shellcheck disable=SC2206
-GO_LDFLAGS=(${GO_LDFLAGS} "-X=${VERSION_SYMBOL}=${GIT_SHA}")
-GO_BUILD_ENV=("CGO_ENABLED=0" "GO_BUILD_FLAGS=${GO_BUILD_FLAGS}" "GOOS=${GOOS}" "GOARCH=${GOARCH}")
+GO_LDFLAGS=(${GO_LDFLAGS:-} "-X=${VERSION_SYMBOL}=${GIT_SHA}")
+GO_BUILD_ENV=("CGO_ENABLED=0" "GO_BUILD_FLAGS=${GO_BUILD_FLAGS:-}" "GOOS=${GOOS}" "GOARCH=${GOARCH}")
 
+GOFAIL_VERSION=$(cd tools/mod && go list -m -f {{.Version}} go.etcd.io/gofail)
 # enable/disable failpoints
 toggle_failpoints() {
   mode="$1"
   if command -v gofail >/dev/null 2>&1; then
-    run gofail "$mode" server/etcdserver/ server/mvcc/backend/
+    run gofail "$mode" server/etcdserver/ server/mvcc/ server/wal/ server/mvcc/backend/
+    if [[ "$mode" == "enable" ]]; then
+      go get go.etcd.io/gofail@${GOFAIL_VERSION}
+      cd ./server && go get go.etcd.io/gofail@${GOFAIL_VERSION}
+      cd ../etcdutl && go get go.etcd.io/gofail@${GOFAIL_VERSION}
+      cd ../etcdctl && go get go.etcd.io/gofail@${GOFAIL_VERSION}
+      cd ../tests && go get go.etcd.io/gofail@${GOFAIL_VERSION}
+      cd ../
+    else
+      go mod tidy
+      cd ./server && go mod tidy
+      cd ../etcdutl && go mod tidy
+      cd ../etcdctl && go mod tidy
+      cd ../tests && go mod tidy
+      cd ../
+    fi
   elif [[ "$mode" != "disable" ]]; then
     log_error "FAILPOINTS set but gofail not found"
     exit 1
@@ -27,13 +49,13 @@ toggle_failpoints() {
 
 toggle_failpoints_default() {
   mode="disable"
-  if [[ -n "$FAILPOINTS" ]]; then mode="enable"; fi
+  if [[ -n "${FAILPOINTS:-}" ]]; then mode="enable"; fi
   toggle_failpoints "$mode"
 }
 
 etcd_build() {
   out="bin"
-  if [[ -n "${BINDIR}" ]]; then out="${BINDIR}"; fi
+  if [[ -n "${BINDIR:-}" ]]; then out="${BINDIR}"; fi
   toggle_failpoints_default
 
   run rm -f "${out}/etcd"
@@ -41,7 +63,8 @@ etcd_build() {
     cd ./server
     # Static compilation is useful when etcd is run in a container. $GO_BUILD_FLAGS is OK
     # shellcheck disable=SC2086
-    run env "${GO_BUILD_ENV[@]}" go build $GO_BUILD_FLAGS \
+    run env "${GO_BUILD_ENV[@]}" go build ${GO_BUILD_FLAGS:-} \
+      -trimpath \
       -installsuffix=cgo \
       "-ldflags=${GO_LDFLAGS[*]}" \
       -o="../${out}/etcd" . || return 2
@@ -51,7 +74,8 @@ etcd_build() {
   # shellcheck disable=SC2086
   (
     cd ./etcdutl
-    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS}" "${GO_BUILD_ENV[@]}" go build $GO_BUILD_FLAGS \
+    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS:-}" "${GO_BUILD_ENV[@]}" go build ${GO_BUILD_FLAGS:-} \
+      -trimpath \
       -installsuffix=cgo \
       "-ldflags=${GO_LDFLAGS[*]}" \
       -o="../${out}/etcdutl" . || return 2
@@ -61,7 +85,8 @@ etcd_build() {
   # shellcheck disable=SC2086
   (
     cd ./etcdctl
-    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS}" "${GO_BUILD_ENV[@]}" go build $GO_BUILD_FLAGS \
+    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS:-}" "${GO_BUILD_ENV[@]}" go build ${GO_BUILD_FLAGS:-} \
+      -trimpath \
       -installsuffix=cgo \
       "-ldflags=${GO_LDFLAGS[*]}" \
       -o="../${out}/etcdctl" . || return 2
@@ -81,7 +106,7 @@ etcd_build() {
 
 tools_build() {
   out="bin"
-  if [[ -n "${BINDIR}" ]]; then out="${BINDIR}"; fi
+  if [[ -n "${BINDIR:-}" ]]; then out="${BINDIR}"; fi
   tools_path="tools/benchmark
     tools/etcd-dump-db
     tools/etcd-dump-logs
@@ -91,9 +116,10 @@ tools_build() {
     echo "Building" "'${tool}'"...
     run rm -f "${out}/${tool}"
     # shellcheck disable=SC2086
-    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS}" CGO_ENABLED=0 go build ${GO_BUILD_FLAGS} \
+    run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS:-}" CGO_ENABLED=0 go build ${GO_BUILD_FLAGS:-} \
+      -trimpath \
       -installsuffix=cgo \
-      "-ldflags='${GO_LDFLAGS[*]}'" \
+      "-ldflags=${GO_LDFLAGS[*]}" \
       -o="${out}/${tool}" "./${tool}" || return 2
   done
   tests_build "${@}"
@@ -101,7 +127,7 @@ tools_build() {
 
 tests_build() {
   out="bin"
-  if [[ -n "${BINDIR}" ]]; then out="${BINDIR}"; fi
+  if [[ -n "${BINDIR:-}" ]]; then out="${BINDIR}"; fi
   tools_path="
     functional/cmd/etcd-agent
     functional/cmd/etcd-proxy
@@ -114,9 +140,9 @@ tests_build() {
       run rm -f "../${out}/${tool}"
 
       # shellcheck disable=SC2086
-      run env CGO_ENABLED=0 GO_BUILD_FLAGS="${GO_BUILD_FLAGS}" go build ${GO_BUILD_FLAGS} \
+      run env CGO_ENABLED=0 GO_BUILD_FLAGS="${GO_BUILD_FLAGS:-}" go build ${GO_BUILD_FLAGS:-} \
         -installsuffix=cgo \
-        "-ldflags='${GO_LDFLAGS[*]}'" \
+        "-ldflags=${GO_LDFLAGS[*]}" \
         -o="../${out}/${tool}" "./${tool}" || return 2
     done
   ) || return 2

client/pkg/fileutil/filereader.go

@@ -0,0 +1,60 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fileutil
+
+import (
+	"bufio"
+	"io"
+	"io/fs"
+	"os"
+)
+
+// FileReader is a wrapper of io.Reader. It also provides file info.
+type FileReader interface {
+	io.Reader
+	FileInfo() (fs.FileInfo, error)
+}
+
+type fileReader struct {
+	*os.File
+}
+
+func NewFileReader(f *os.File) FileReader {
+	return &fileReader{f}
+}
+
+func (fr *fileReader) FileInfo() (fs.FileInfo, error) {
+	return fr.Stat()
+}
+
+// FileBufReader is a wrapper of bufio.Reader. It also provides file info.
+type FileBufReader struct {
+	*bufio.Reader
+	fi fs.FileInfo
+}
+
+func NewFileBufReader(fr FileReader) *FileBufReader {
+	bufReader := bufio.NewReader(fr)
+	fi, err := fr.FileInfo()
+	if err != nil {
+		// This should never happen.
+		panic(err)
+	}
+	return &FileBufReader{bufReader, fi}
+}
+
+func (fbr *FileBufReader) FileInfo() fs.FileInfo {
+	return fbr.fi
+}

client/pkg/fileutil/filereader_test.go

@@ -0,0 +1,44 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fileutil
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFileBufReader(t *testing.T) {
+	f, err := os.CreateTemp(t.TempDir(), "wal")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+	fi, err := f.Stat()
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	fbr := NewFileBufReader(NewFileReader(f))
+
+	if !strings.HasPrefix(fbr.FileInfo().Name(), "wal") {
+		t.Errorf("Unexpected file name: %s", fbr.FileInfo().Name())
+	}
+	assert.Equal(t, fi.Size(), fbr.FileInfo().Size())
+	assert.Equal(t, fi.IsDir(), fbr.FileInfo().IsDir())
+	assert.Equal(t, fi.Mode(), fbr.FileInfo().Mode())
+	assert.Equal(t, fi.ModTime(), fbr.FileInfo().ModTime())
+}

client/pkg/fileutil/fileutil.go

@@ -44,16 +44,12 @@ func IsDirWriteable(dir string) error {
 
 // TouchDirAll is similar to os.MkdirAll. It creates directories with 0700 permission if any directory
 // does not exists. TouchDirAll also ensures the given directory is writable.
-func TouchDirAll(dir string) error {
+func TouchDirAll(lg *zap.Logger, dir string) error {
 	// If path is already a directory, MkdirAll does nothing and returns nil, so,
 	// first check if dir exist with an expected permission mode.
 	if Exist(dir) {
 		err := CheckDirPermission(dir, PrivateDirMode)
 		if err != nil {
-			lg, _ := zap.NewProduction()
-			if lg == nil {
-				lg = zap.NewExample()
-			}
 			lg.Warn("check file permission", zap.Error(err))
 		}
 	} else {
@@ -70,8 +66,8 @@ func TouchDirAll(dir string) error {
 
 // CreateDirAll is similar to TouchDirAll but returns error
 // if the deepest directory was not empty.
-func CreateDirAll(dir string) error {
-	err := TouchDirAll(dir)
+func CreateDirAll(lg *zap.Logger, dir string) error {
+	err := TouchDirAll(lg, dir)
 	if err == nil {
 		var ns []string
 		ns, err = ReadDir(dir)

client/pkg/fileutil/fileutil_test.go

@@ -67,7 +67,7 @@ func TestCreateDirAll(t *testing.T) {
 	defer os.RemoveAll(tmpdir)
 
 	tmpdir2 := filepath.Join(tmpdir, "testdir")
-	if err = CreateDirAll(tmpdir2); err != nil {
+	if err = CreateDirAll(zaptest.NewLogger(t), tmpdir2); err != nil {
 		t.Fatal(err)
 	}
 
@@ -75,7 +75,7 @@ func TestCreateDirAll(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if err = CreateDirAll(tmpdir2); err == nil || !strings.Contains(err.Error(), "to be empty, got") {
+	if err = CreateDirAll(zaptest.NewLogger(t), tmpdir2); err == nil || !strings.Contains(err.Error(), "to be empty, got") {
 		t.Fatalf("unexpected error %v", err)
 	}
 }
@@ -186,7 +186,7 @@ func TestDirPermission(t *testing.T) {
 
 	tmpdir2 := filepath.Join(tmpdir, "testpermission")
 	// create a new dir with 0700
-	if err = CreateDirAll(tmpdir2); err != nil {
+	if err = CreateDirAll(zaptest.NewLogger(t), tmpdir2); err != nil {
 		t.Fatal(err)
 	}
 	// check dir permission with mode different than created dir

client/pkg/fileutil/purge.go

@@ -25,22 +25,34 @@ import (
 )
 
 func PurgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) <-chan error {
-	return purgeFile(lg, dirname, suffix, max, interval, stop, nil, nil)
+	return purgeFile(lg, dirname, suffix, max, interval, stop, nil, nil, true)
 }
 
 func PurgeFileWithDoneNotify(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) (<-chan struct{}, <-chan error) {
 	doneC := make(chan struct{})
-	errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC)
+	errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC, true)
+	return doneC, errC
+}
+
+func PurgeFileWithoutFlock(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) (<-chan struct{}, <-chan error) {
+	doneC := make(chan struct{})
+	errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC, false)
 	return doneC, errC
 }
 
 // purgeFile is the internal implementation for PurgeFile which can post purged files to purgec if non-nil.
 // if donec is non-nil, the function closes it to notify its exit.
-func purgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}, purgec chan<- string, donec chan<- struct{}) <-chan error {
+func purgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}, purgec chan<- string, donec chan<- struct{}, flock bool) <-chan error {
 	if lg == nil {
 		lg = zap.NewNop()
 	}
 	errC := make(chan error, 1)
+	lg.Info("started to purge file",
+		zap.String("dir", dirname),
+		zap.String("suffix", suffix),
+		zap.Uint("max", max),
+		zap.Duration("interval", interval))
+
 	go func() {
 		if donec != nil {
 			defer close(donec)
@@ -61,18 +73,25 @@ func purgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval
 			fnames = newfnames
 			for len(newfnames) > int(max) {
 				f := filepath.Join(dirname, newfnames[0])
-				l, err := TryLockFile(f, os.O_WRONLY, PrivateFileMode)
-				if err != nil {
-					break
+				var l *LockedFile
+				if flock {
+					l, err = TryLockFile(f, os.O_WRONLY, PrivateFileMode)
+					if err != nil {
+						lg.Warn("failed to lock file", zap.String("path", f), zap.Error(err))
+						break
+					}
 				}
 				if err = os.Remove(f); err != nil {
+					lg.Error("failed to remove file", zap.String("path", f), zap.Error(err))
 					errC <- err
 					return
 				}
-				if err = l.Close(); err != nil {
-					lg.Warn("failed to unlock/close", zap.String("path", l.Name()), zap.Error(err))
-					errC <- err
-					return
+				if flock {
+					if err = l.Close(); err != nil {
+						lg.Error("failed to unlock/close", zap.String("path", l.Name()), zap.Error(err))
+						errC <- err
+						return
+					}
 				}
 				lg.Info("purged", zap.String("path", f))
 				newfnames = newfnames[1:]

client/pkg/fileutil/purge_test.go

@@ -45,7 +45,7 @@ func TestPurgeFile(t *testing.T) {
 	stop, purgec := make(chan struct{}), make(chan string, 10)
 
 	// keep 3 most recent files
-	errch := purgeFile(zap.NewExample(), dir, "test", 3, time.Millisecond, stop, purgec, nil)
+	errch := purgeFile(zap.NewExample(), dir, "test", 3, time.Millisecond, stop, purgec, nil, false)
 	select {
 	case f := <-purgec:
 		t.Errorf("unexpected purge on %q", f)
@@ -116,7 +116,7 @@ func TestPurgeFileHoldingLockFile(t *testing.T) {
 	}
 
 	stop, purgec := make(chan struct{}), make(chan string, 10)
-	errch := purgeFile(zap.NewExample(), dir, "test", 3, time.Millisecond, stop, purgec, nil)
+	errch := purgeFile(zap.NewExample(), dir, "test", 3, time.Millisecond, stop, purgec, nil, true)
 
 	for i := 0; i < 5; i++ {
 		select {

client/pkg/go.mod

@@ -1,10 +1,18 @@
 module go.etcd.io/etcd/client/pkg/v3
 
-go 1.16
+go 1.20
 
 require (
-	github.com/coreos/go-systemd/v22 v22.3.1
-	go.uber.org/zap v1.16.1-0.20210329175301-c23abee72d19
+	github.com/coreos/go-systemd/v22 v22.3.2
+	github.com/stretchr/testify v1.8.4
+	go.uber.org/zap v1.17.0
 	golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57
-	google.golang.org/grpc v1.37.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

client/pkg/go.sum

@@ -1,96 +1,31 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/coreos/go-systemd/v22 v22.3.1 h1:7OO2CXWMYNDdaAzP51t4lCCZWwpQHmvPbm9sxWjm3So=
-github.com/coreos/go-systemd/v22 v22.3.1/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI=
+github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
-github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
-github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
-github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
-github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/multierr v1.6.0 h1:y6IPFStTAIT5Ytl7/XYmHvzXQ7S3g/IeZW9hyZ5thw4=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
-go.uber.org/zap v1.16.1-0.20210329175301-c23abee72d19 h1:040c3dLNhgFQkoojH2AMpHCy4SrvhmxdU72d9GLGGE0=
-go.uber.org/zap v1.16.1-0.20210329175301-c23abee72d19/go.mod h1:aMfIlz3TDBfB0BwTCKFU1XbEmj9zevr5S5LcBr85MXw=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
-golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
-golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
-golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+go.uber.org/zap v1.17.0 h1:MTjgFu6ZLKvY6Pvaqk97GlxNBuMpV4Hy/3P6tRGlI2U=
+go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57 h1:F5Gozwx4I1xtr/sr/8CFbb57iKi3297KFs0QDbGN60A=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
-google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.37.0 h1:uSZWeQJX5j11bIQ4AJoj+McDBo29cY1MCoC1wO3ts+c=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

client/pkg/logutil/zap.go

@@ -16,11 +16,23 @@ package logutil
 
 import (
 	"sort"
+	"time"
 
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
 
+// CreateDefaultZapLogger creates a logger with default zap configuration
+func CreateDefaultZapLogger(level zapcore.Level) (*zap.Logger, error) {
+	lcfg := DefaultZapLoggerConfig
+	lcfg.Level = zap.NewAtomicLevelAt(level)
+	c, err := lcfg.Build()
+	if err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
 // DefaultZapLoggerConfig defines default zap logger configuration.
 var DefaultZapLoggerConfig = zap.Config{
 	Level: zap.NewAtomicLevelAt(ConvertToZapLevel(DefaultLogLevel)),
@@ -35,15 +47,20 @@ var DefaultZapLoggerConfig = zap.Config{
 
 	// copied from "zap.NewProductionEncoderConfig" with some updates
 	EncoderConfig: zapcore.EncoderConfig{
-		TimeKey:        "ts",
-		LevelKey:       "level",
-		NameKey:        "logger",
-		CallerKey:      "caller",
-		MessageKey:     "msg",
-		StacktraceKey:  "stacktrace",
-		LineEnding:     zapcore.DefaultLineEnding,
-		EncodeLevel:    zapcore.LowercaseLevelEncoder,
-		EncodeTime:     zapcore.ISO8601TimeEncoder,
+		TimeKey:       "ts",
+		LevelKey:      "level",
+		NameKey:       "logger",
+		CallerKey:     "caller",
+		MessageKey:    "msg",
+		StacktraceKey: "stacktrace",
+		LineEnding:    zapcore.DefaultLineEnding,
+		EncodeLevel:   zapcore.LowercaseLevelEncoder,
+
+		// Custom EncodeTime function to ensure we match format and precision of historic capnslog timestamps
+		EncodeTime: func(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
+			enc.AppendString(t.Format("2006-01-02T15:04:05.999999Z0700"))
+		},
+
 		EncodeDuration: zapcore.StringDurationEncoder,
 		EncodeCaller:   zapcore.ShortCallerEncoder,
 	},

client/pkg/logutil/zap_grpc.go

@@ -1,111 +0,0 @@
-// Copyright 2018 The etcd Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package logutil
-
-import (
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-	"google.golang.org/grpc/grpclog"
-)
-
-// NewGRPCLoggerV2 converts "*zap.Logger" to "grpclog.LoggerV2".
-// It discards all INFO level logging in gRPC, if debug level
-// is not enabled in "*zap.Logger".
-func NewGRPCLoggerV2(lcfg zap.Config) (grpclog.LoggerV2, error) {
-	lg, err := lcfg.Build(zap.AddCallerSkip(1)) // to annotate caller outside of "logutil"
-	if err != nil {
-		return nil, err
-	}
-	return &zapGRPCLogger{lg: lg, sugar: lg.Sugar()}, nil
-}
-
-// NewGRPCLoggerV2FromZapCore creates "grpclog.LoggerV2" from "zap.Core"
-// and "zapcore.WriteSyncer". It discards all INFO level logging in gRPC,
-// if debug level is not enabled in "*zap.Logger".
-func NewGRPCLoggerV2FromZapCore(cr zapcore.Core, syncer zapcore.WriteSyncer) grpclog.LoggerV2 {
-	// "AddCallerSkip" to annotate caller outside of "logutil"
-	lg := zap.New(cr, zap.AddCaller(), zap.AddCallerSkip(1), zap.ErrorOutput(syncer)).Named("grpc")
-	return &zapGRPCLogger{lg: lg, sugar: lg.Sugar()}
-}
-
-type zapGRPCLogger struct {
-	lg    *zap.Logger
-	sugar *zap.SugaredLogger
-}
-
-func (zl *zapGRPCLogger) Info(args ...interface{}) {
-	if !zl.lg.Core().Enabled(zapcore.DebugLevel) {
-		return
-	}
-	zl.sugar.Info(args...)
-}
-
-func (zl *zapGRPCLogger) Infoln(args ...interface{}) {
-	if !zl.lg.Core().Enabled(zapcore.DebugLevel) {
-		return
-	}
-	zl.sugar.Info(args...)
-}
-
-func (zl *zapGRPCLogger) Infof(format string, args ...interface{}) {
-	if !zl.lg.Core().Enabled(zapcore.DebugLevel) {
-		return
-	}
-	zl.sugar.Infof(format, args...)
-}
-
-func (zl *zapGRPCLogger) Warning(args ...interface{}) {
-	zl.sugar.Warn(args...)
-}
-
-func (zl *zapGRPCLogger) Warningln(args ...interface{}) {
-	zl.sugar.Warn(args...)
-}
-
-func (zl *zapGRPCLogger) Warningf(format string, args ...interface{}) {
-	zl.sugar.Warnf(format, args...)
-}
-
-func (zl *zapGRPCLogger) Error(args ...interface{}) {
-	zl.sugar.Error(args...)
-}
-
-func (zl *zapGRPCLogger) Errorln(args ...interface{}) {
-	zl.sugar.Error(args...)
-}
-
-func (zl *zapGRPCLogger) Errorf(format string, args ...interface{}) {
-	zl.sugar.Errorf(format, args...)
-}
-
-func (zl *zapGRPCLogger) Fatal(args ...interface{}) {
-	zl.sugar.Fatal(args...)
-}
-
-func (zl *zapGRPCLogger) Fatalln(args ...interface{}) {
-	zl.sugar.Fatal(args...)
-}
-
-func (zl *zapGRPCLogger) Fatalf(format string, args ...interface{}) {
-	zl.sugar.Fatalf(format, args...)
-}
-
-func (zl *zapGRPCLogger) V(l int) bool {
-	// infoLog == 0
-	if l <= 0 { // debug level, then we ignore info level in gRPC
-		return !zl.lg.Core().Enabled(zapcore.DebugLevel)
-	}
-	return true
-}

client/pkg/logutil/zap_grpc_test.go

@@ -1,91 +0,0 @@
-// Copyright 2018 The etcd Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package logutil
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-	"time"
-
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-)
-
-func TestNewGRPCLoggerV2(t *testing.T) {
-	logPath := filepath.Join(os.TempDir(), fmt.Sprintf("test-log-%d", time.Now().UnixNano()))
-	defer os.RemoveAll(logPath)
-
-	lcfg := zap.Config{
-		Level:       zap.NewAtomicLevelAt(zap.InfoLevel),
-		Development: false,
-		Sampling: &zap.SamplingConfig{
-			Initial:    100,
-			Thereafter: 100,
-		},
-		Encoding:         "json",
-		EncoderConfig:    DefaultZapLoggerConfig.EncoderConfig,
-		OutputPaths:      []string{logPath},
-		ErrorOutputPaths: []string{logPath},
-	}
-	gl, err := NewGRPCLoggerV2(lcfg)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// debug level is not enabled,
-	// so info level gRPC-side logging is discarded
-	gl.Info("etcd-logutil-1")
-	data, err := ioutil.ReadFile(logPath)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if bytes.Contains(data, []byte("etcd-logutil-1")) {
-		t.Fatalf("unexpected line %q", string(data))
-	}
-
-	gl.Warning("etcd-logutil-2")
-	data, err = ioutil.ReadFile(logPath)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Contains(data, []byte("etcd-logutil-2")) {
-		t.Fatalf("can't find data in log %q", string(data))
-	}
-	if !bytes.Contains(data, []byte("logutil/zap_grpc_test.go:")) {
-		t.Fatalf("unexpected caller; %q", string(data))
-	}
-}
-
-func TestNewGRPCLoggerV2FromZapCore(t *testing.T) {
-	buf := bytes.NewBuffer(nil)
-	syncer := zapcore.AddSync(buf)
-	cr := zapcore.NewCore(
-		zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig()),
-		syncer,
-		zap.NewAtomicLevelAt(zap.InfoLevel),
-	)
-
-	lg := NewGRPCLoggerV2FromZapCore(cr, syncer)
-	lg.Warning("TestNewGRPCLoggerV2FromZapCore")
-	txt := buf.String()
-	if !strings.Contains(txt, "TestNewGRPCLoggerV2FromZapCore") {
-		t.Fatalf("unexpected log %q", txt)
-	}
-}

client/pkg/srv/srv_test.go

@@ -228,10 +228,10 @@ func TestSRVDiscover(t *testing.T) {
 			[]*net.SRV{
 				{Target: "a.example.com", Port: 2480},
 				{Target: "b.example.com", Port: 2480},
-				{Target: "c.example.com", Port: 2480},
+				{Target: "c.example.com.", Port: 2480},
 			},
 			[]*net.SRV{},
-			[]string{"https://a.example.com:2480", "https://b.example.com:2480", "https://c.example.com:2480"},
+			[]string{"https://a.example.com:2480", "https://b.example.com:2480", "https://c.example.com.:2480"},
 			false,
 		},
 	}

client/pkg/testutil/leak.go

@@ -16,6 +16,8 @@ import (
 	"time"
 )
 
+// TODO: Replace with https://github.com/uber-go/goleak.
+
 /*
 CheckLeakedGoroutine verifies tests do not leave any leaky
 goroutines. It returns true when there are goroutines still
@@ -28,10 +30,9 @@ running(leaking) after all tests.
 	}
 
 	func TestSample(t *testing.T) {
-		BeforeTest(t)
+		RegisterLeakDetection(t)
 		...
 	}
-
 */
 func CheckLeakedGoroutine() bool {
 	gs := interestingGoroutines()
@@ -94,22 +95,22 @@ func CheckAfterTest(d time.Duration) error {
 	return fmt.Errorf("appears to have leaked %s:\n%s", bad, stacks)
 }
 
-// BeforeTest is a convenient way to register before-and-after code to a test.
-// If you execute BeforeTest, you don't need to explicitly register AfterTest.
-func BeforeTest(t TB) {
+// RegisterLeakDetection is a convenient way to register before-and-after code to a test.
+// If you execute RegisterLeakDetection, you don't need to explicitly register AfterTest.
+func RegisterLeakDetection(t TB) {
 	if err := CheckAfterTest(10 * time.Millisecond); err != nil {
 		t.Skip("Found leaked goroutined BEFORE test", err)
 		return
 	}
 	t.Cleanup(func() {
-		AfterTest(t)
+		afterTest(t)
 	})
 }
 
-// AfterTest is meant to run in a defer that executes after a test completes.
+// afterTest is meant to run in a defer that executes after a test completes.
 // It will detect common goroutine leaks, retrying in case there are goroutines
 // not synchronously torn down, and fail the test if any goroutines are stuck.
-func AfterTest(t TB) {
+func afterTest(t TB) {
 	// If test-failed the leaked goroutines list is hidding the real
 	// source of problem.
 	if !t.Failed() {

client/pkg/testutil/leak_test.go

@@ -35,7 +35,7 @@ func TestMain(m *testing.M) {
 
 func TestSample(t *testing.T) {
 	SkipTestIfShortMode(t, "Counting leaked routines is disabled in --short tests")
-	defer AfterTest(t)
+	defer afterTest(t)
 	ranSample = true
 	for range make([]struct{}, 100) {
 		go func() {

client/pkg/tlsutil/cipher_suites.go

@@ -14,7 +14,10 @@
 
 package tlsutil
 
-import "crypto/tls"
+import (
+	"crypto/tls"
+	"fmt"
+)
 
 // GetCipherSuite returns the corresponding cipher suite,
 // and boolean value if it is supported.
@@ -37,3 +40,17 @@ func GetCipherSuite(s string) (uint16, bool) {
 	}
 	return 0, false
 }
+
+// GetCipherSuites returns list of corresponding cipher suite IDs.
+func GetCipherSuites(ss []string) ([]uint16, error) {
+	cs := make([]uint16, len(ss))
+	for i, s := range ss {
+		var ok bool
+		cs[i], ok = GetCipherSuite(s)
+		if !ok {
+			return nil, fmt.Errorf("unexpected TLS cipher suite %q", s)
+		}
+	}
+
+	return cs, nil
+}

client/pkg/tlsutil/versions.go

@@ -0,0 +1,47 @@
+// Copyright 2023 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tlsutil
+
+import (
+	"crypto/tls"
+	"fmt"
+)
+
+type TLSVersion string
+
+// Constants for TLS versions.
+const (
+	TLSVersionDefault TLSVersion = ""
+	TLSVersion12      TLSVersion = "TLS1.2"
+	TLSVersion13      TLSVersion = "TLS1.3"
+)
+
+// GetTLSVersion returns the corresponding tls.Version or error.
+func GetTLSVersion(version string) (uint16, error) {
+	var v uint16
+
+	switch version {
+	case string(TLSVersionDefault):
+		v = 0 // 0 means let Go decide.
+	case string(TLSVersion12):
+		v = tls.VersionTLS12
+	case string(TLSVersion13):
+		v = tls.VersionTLS13
+	default:
+		return 0, fmt.Errorf("unexpected TLS version %q (must be one of: TLS1.2, TLS1.3)", version)
+	}
+
+	return v, nil
+}

client/pkg/tlsutil/versions_test.go

@@ -0,0 +1,63 @@
+// Copyright 2023 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tlsutil
+
+import (
+	"crypto/tls"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVersion(t *testing.T) {
+	tests := []struct {
+		name        string
+		version     string
+		want        uint16
+		expectError bool
+	}{
+		{
+			name:    "TLS1.2",
+			version: "TLS1.2",
+			want:    tls.VersionTLS12,
+		},
+		{
+			name:    "TLS1.3",
+			version: "TLS1.3",
+			want:    tls.VersionTLS13,
+		},
+		{
+			name:    "Empty version",
+			version: "",
+			want:    0,
+		},
+		{
+			name:        "Converting invalid version string to TLS version",
+			version:     "not_existing",
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := GetTLSVersion(tt.version)
+			if err != nil {
+				assert.True(t, tt.expectError, "GetTLSVersion() returned error while expecting success: %v", err)
+				return
+			}
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}

client/pkg/transport/keepalive_listener.go

@@ -21,26 +21,29 @@ import (
 	"time"
 )
 
-type keepAliveConn interface {
-	SetKeepAlive(bool) error
-	SetKeepAlivePeriod(d time.Duration) error
-}
-
 // NewKeepAliveListener returns a listener that listens on the given address.
 // Be careful when wrap around KeepAliveListener with another Listener if TLSInfo is not nil.
 // Some pkgs (like go/http) might expect Listener to return TLSConn type to start TLS handshake.
 // http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/overview.html
+//
+// Note(ahrtr):
+// only `net.TCPConn` supports `SetKeepAlive` and `SetKeepAlivePeriod`
+// by default, so if you want to wrap multiple layers of net.Listener,
+// the `keepaliveListener` should be the one which is closest to the
+// original `net.Listener` implementation, namely `TCPListener`.
 func NewKeepAliveListener(l net.Listener, scheme string, tlscfg *tls.Config) (net.Listener, error) {
+	kal := &keepaliveListener{
+		Listener: l,
+	}
+
 	if scheme == "https" {
 		if tlscfg == nil {
 			return nil, fmt.Errorf("cannot listen on TLS for given listener: KeyFile and CertFile are not presented")
 		}
-		return newTLSKeepaliveListener(l, tlscfg), nil
+		return newTLSKeepaliveListener(kal, tlscfg), nil
 	}
 
-	return &keepaliveListener{
-		Listener: l,
-	}, nil
+	return kal, nil
 }
 
 type keepaliveListener struct{ net.Listener }
@@ -50,13 +53,43 @@ func (kln *keepaliveListener) Accept() (net.Conn, error) {
 	if err != nil {
 		return nil, err
 	}
-	kac := c.(keepAliveConn)
+
+	kac, err := createKeepaliveConn(c)
+	if err != nil {
+		return nil, fmt.Errorf("create keepalive connection failed, %w", err)
+	}
 	// detection time: tcp_keepalive_time + tcp_keepalive_probes + tcp_keepalive_intvl
 	// default on linux:  30 + 8 * 30
 	// default on osx:    30 + 8 * 75
-	kac.SetKeepAlive(true)
-	kac.SetKeepAlivePeriod(30 * time.Second)
-	return c, nil
+	if err := kac.SetKeepAlive(true); err != nil {
+		return nil, fmt.Errorf("SetKeepAlive failed, %w", err)
+	}
+	if err := kac.SetKeepAlivePeriod(30 * time.Second); err != nil {
+		return nil, fmt.Errorf("SetKeepAlivePeriod failed, %w", err)
+	}
+	return kac, nil
+}
+
+func createKeepaliveConn(c net.Conn) (*keepAliveConn, error) {
+	tcpc, ok := c.(*net.TCPConn)
+	if !ok {
+		return nil, ErrNotTCP
+	}
+	return &keepAliveConn{tcpc}, nil
+}
+
+type keepAliveConn struct {
+	*net.TCPConn
+}
+
+// SetKeepAlive sets keepalive
+func (l *keepAliveConn) SetKeepAlive(doKeepAlive bool) error {
+	return l.TCPConn.SetKeepAlive(doKeepAlive)
+}
+
+// SetKeepAlivePeriod sets keepalive period
+func (l *keepAliveConn) SetKeepAlivePeriod(d time.Duration) error {
+	return l.TCPConn.SetKeepAlivePeriod(d)
 }
 
 // A tlsKeepaliveListener implements a network listener (net.Listener) for TLS connections.
@@ -72,12 +105,6 @@ func (l *tlsKeepaliveListener) Accept() (c net.Conn, err error) {
 	if err != nil {
 		return
 	}
-	kac := c.(keepAliveConn)
-	// detection time: tcp_keepalive_time + tcp_keepalive_probes + tcp_keepalive_intvl
-	// default on linux:  30 + 8 * 30
-	// default on osx:    30 + 8 * 75
-	kac.SetKeepAlive(true)
-	kac.SetKeepAlivePeriod(30 * time.Second)
 	c = tls.Server(c, l.config)
 	return c, nil
 }

client/pkg/transport/keepalive_listener_test.go

@@ -40,6 +40,9 @@ func TestNewKeepAliveListener(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unexpected Accept error: %v", err)
 	}
+	if _, ok := conn.(*keepAliveConn); !ok {
+		t.Fatalf("Unexpected conn type: %T, wanted *keepAliveConn", conn)
+	}
 	conn.Close()
 	ln.Close()
 

client/pkg/transport/limit_listen.go

@@ -63,6 +63,9 @@ func (l *limitListenerConn) Close() error {
 	return err
 }
 
+// SetKeepAlive sets keepalive
+//
+// Deprecated: use (*keepAliveConn) SetKeepAlive instead.
 func (l *limitListenerConn) SetKeepAlive(doKeepAlive bool) error {
 	tcpc, ok := l.Conn.(*net.TCPConn)
 	if !ok {
@@ -71,6 +74,9 @@ func (l *limitListenerConn) SetKeepAlive(doKeepAlive bool) error {
 	return tcpc.SetKeepAlive(doKeepAlive)
 }
 
+// SetKeepAlivePeriod sets keepalive period
+//
+// Deprecated: use (*keepAliveConn) SetKeepAlivePeriod instead.
 func (l *limitListenerConn) SetKeepAlivePeriod(d time.Duration) error {
 	tcpc, ok := l.Conn.(*net.TCPConn)
 	if !ok {

client/pkg/transport/listener.go

@@ -68,7 +68,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 		fallthrough
 	case lnOpts.IsTimeout(), lnOpts.IsSocketOpts():
 		// timeout listener with socket options.
-		ln, err := lnOpts.ListenConfig.Listen(context.TODO(), "tcp", addr)
+		ln, err := newKeepAliveListener(&lnOpts.ListenConfig, addr)
 		if err != nil {
 			return nil, err
 		}
@@ -78,7 +78,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 			writeTimeout: lnOpts.writeTimeout,
 		}
 	case lnOpts.IsTimeout():
-		ln, err := net.Listen("tcp", addr)
+		ln, err := newKeepAliveListener(nil, addr)
 		if err != nil {
 			return nil, err
 		}
@@ -88,7 +88,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 			writeTimeout: lnOpts.writeTimeout,
 		}
 	default:
-		ln, err := net.Listen("tcp", addr)
+		ln, err := newKeepAliveListener(nil, addr)
 		if err != nil {
 			return nil, err
 		}
@@ -102,6 +102,19 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 	return wrapTLS(scheme, lnOpts.tlsInfo, lnOpts.Listener)
 }
 
+func newKeepAliveListener(cfg *net.ListenConfig, addr string) (ln net.Listener, err error) {
+	if cfg != nil {
+		ln, err = cfg.Listen(context.TODO(), "tcp", addr)
+	} else {
+		ln, err = net.Listen("tcp", addr)
+	}
+	if err != nil {
+		return
+	}
+
+	return NewKeepAliveListener(ln, "tcp", nil)
+}
+
 func wrapTLS(scheme string, tlsinfo *TLSInfo, l net.Listener) (net.Listener, error) {
 	if scheme != "https" && scheme != "unixs" {
 		return l, nil
@@ -152,6 +165,14 @@ type TLSInfo struct {
 	// Note that cipher suites are prioritized in the given order.
 	CipherSuites []uint16
 
+	// MinVersion is the minimum TLS version that is acceptable.
+	// If not set, the minimum version is TLS 1.2.
+	MinVersion uint16
+
+	// MaxVersion is the maximum TLS version that is acceptable.
+	// If not set, the default used by Go is selected (see tls.Config.MaxVersion).
+	MaxVersion uint16
+
 	selfCert bool
 
 	// parseFunc exists to simplify testing. Typically, parseFunc
@@ -192,7 +213,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 		)
 		return
 	}
-	err = fileutil.TouchDirAll(dirpath)
+	err = fileutil.TouchDirAll(lg, dirpath)
 	if err != nil {
 		if info.Logger != nil {
 			info.Logger.Warn(
@@ -326,8 +347,8 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertVali
 // Previously,
 // 1. Server has non-empty (*tls.Config).Certificates on client hello
 // 2. Server calls (*tls.Config).GetCertificate iff:
-//    - Server's (*tls.Config).Certificates is not empty, or
-//    - Client supplies SNI; non-empty (*tls.ClientHelloInfo).ServerName
+//   - Server's (*tls.Config).Certificates is not empty, or
+//   - Client supplies SNI; non-empty (*tls.ClientHelloInfo).ServerName
 //
 // When (*tls.Config).Certificates is always populated on initial handshake,
 // client is expected to provide a valid matching SNI to pass the TLS
@@ -365,8 +386,17 @@ func (info TLSInfo) baseConfig() (*tls.Config, error) {
 		}
 	}
 
+	var minVersion uint16
+	if info.MinVersion != 0 {
+		minVersion = info.MinVersion
+	} else {
+		// Default minimum version is TLS 1.2, previous versions are insecure and deprecated.
+		minVersion = tls.VersionTLS12
+	}
+
 	cfg := &tls.Config{
-		MinVersion: tls.VersionTLS12,
+		MinVersion: minVersion,
+		MaxVersion: info.MaxVersion,
 		ServerName: info.ServerName,
 	}
 
@@ -497,11 +527,6 @@ func (info TLSInfo) ServerConfig() (*tls.Config, error) {
 	// "h2" NextProtos is necessary for enabling HTTP2 for go's HTTP server
 	cfg.NextProtos = []string{"h2"}
 
-	// go1.13 enables TLS 1.3 by default
-	// and in TLS 1.3, cipher suites are not configurable
-	// setting Max TLS version to TLS 1.2 for go 1.13
-	cfg.MaxVersion = tls.VersionTLS12
-
 	return cfg, nil
 }
 
@@ -556,11 +581,6 @@ func (info TLSInfo) ClientConfig() (*tls.Config, error) {
 		}
 	}
 
-	// go1.13 enables TLS 1.3 by default
-	// and in TLS 1.3, cipher suites are not configurable
-	// setting Max TLS version to TLS 1.2 for go 1.13
-	cfg.MaxVersion = tls.VersionTLS12
-
 	return cfg, nil
 }
 

client/pkg/transport/listener_test.go

@@ -213,6 +213,15 @@ func TestNewListenerWithSocketOpts(t *testing.T) {
 			if !test.expectedErr && err != nil {
 				t.Fatalf("unexpected error: %v", err)
 			}
+
+			if test.scheme == "http" {
+				lnOpts := newListenOpts(test.opts...)
+				if !lnOpts.IsSocketOpts() && !lnOpts.IsTimeout() {
+					if _, ok := ln.(*keepaliveListener); !ok {
+						t.Fatalf("ln: unexpected listener type: %T, wanted *keepaliveListener", ln)
+					}
+				}
+			}
 		})
 	}
 }

client/pkg/transport/sockopt.go

@@ -21,12 +21,12 @@ type SocketOpts struct {
 	// in which case lock on data file could result in unexpected
 	// condition. User should take caution to protect against lock race.
 	// [1] https://man7.org/linux/man-pages/man7/socket.7.html
-	ReusePort bool
+	ReusePort bool `json:"reuse-port"`
 	// ReuseAddress enables a socket option SO_REUSEADDR which allows
 	// binding to an address in `TIME_WAIT` state. Useful to improve MTTR
 	// in cases where etcd slow to restart due to excessive `TIME_WAIT`.
 	// [1] https://man7.org/linux/man-pages/man7/socket.7.html
-	ReuseAddress bool
+	ReuseAddress bool `json:"reuse-address"`
 }
 
 func getControls(sopts *SocketOpts) Controls {

client/pkg/transport/sockopt_solaris.go

@@ -0,0 +1,35 @@
+// Copyright 2021 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build solaris
+// +build solaris
+
+package transport
+
+import (
+	"fmt"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func setReusePort(network, address string, c syscall.RawConn) error {
+	return fmt.Errorf("port reuse is not supported on Solaris")
+}
+
+func setReuseAddress(network, address string, conn syscall.RawConn) error {
+	return conn.Control(func(fd uintptr) {
+		syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+	})
+}

client/pkg/transport/sockopt_unix.go

@@ -1,5 +1,19 @@
-//go:build !windows
-// +build !windows
+// Copyright 2021 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !windows && !solaris
+// +build !windows,!solaris
 
 package transport
 

client/pkg/transport/tls.go

@@ -15,6 +15,7 @@
 package transport
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -27,6 +28,8 @@ func ValidateSecureEndpoints(tlsInfo TLSInfo, eps []string) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer t.CloseIdleConnections()
+
 	var errs []string
 	var endpoints []string
 	for _, ep := range eps {
@@ -34,7 +37,7 @@ func ValidateSecureEndpoints(tlsInfo TLSInfo, eps []string) ([]string, error) {
 			errs = append(errs, fmt.Sprintf("%q is insecure", ep))
 			continue
 		}
-		conn, cerr := t.Dial("tcp", ep[len("https://"):])
+		conn, cerr := t.DialContext(context.Background(), "tcp", ep[len("https://"):])
 		if cerr != nil {
 			errs = append(errs, fmt.Sprintf("%q failed to dial (%v)", ep, cerr))
 			continue

client/pkg/transport/tls_test.go

@@ -0,0 +1,90 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package transport
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"testing"
+)
+
+func TestValidateSecureEndpoints(t *testing.T) {
+	tlsInfo, certCleanup, err := createSelfCert()
+	if err != nil {
+		t.Fatalf("unable to create cert: %v", err)
+	}
+	defer certCleanup()
+
+	remoteAddr := func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(r.RemoteAddr))
+	}
+	srv := httptest.NewServer(http.HandlerFunc(remoteAddr))
+	defer srv.Close()
+
+	tests := map[string]struct {
+		endPoints         []string
+		expectedEndpoints []string
+		expectedErr       bool
+	}{
+		"invalidEndPoints": {
+			endPoints: []string{
+				"invalid endpoint",
+			},
+			expectedEndpoints: nil,
+			expectedErr:       true,
+		},
+		"insecureEndpoints": {
+			endPoints: []string{
+				"http://127.0.0.1:8000",
+				"http://" + srv.Listener.Addr().String(),
+			},
+			expectedEndpoints: nil,
+			expectedErr:       true,
+		},
+		"secureEndPoints": {
+			endPoints: []string{
+				"https://" + srv.Listener.Addr().String(),
+			},
+			expectedEndpoints: []string{
+				"https://" + srv.Listener.Addr().String(),
+			},
+			expectedErr: false,
+		},
+		"mixEndPoints": {
+			endPoints: []string{
+				"https://" + srv.Listener.Addr().String(),
+				"http://" + srv.Listener.Addr().String(),
+				"invalid end points",
+			},
+			expectedEndpoints: []string{
+				"https://" + srv.Listener.Addr().String(),
+			},
+			expectedErr: true,
+		},
+	}
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			secureEps, err := ValidateSecureEndpoints(*tlsInfo, test.endPoints)
+			if test.expectedErr != (err != nil) {
+				t.Errorf("Unexpected error, got: %v, want: %v", err, test.expectedErr)
+			}
+
+			if !reflect.DeepEqual(test.expectedEndpoints, secureEps) {
+				t.Errorf("expected endpoints %v, got %v", test.expectedEndpoints, secureEps)
+			}
+		})
+	}
+}

client/v2/doc.go

@@ -68,6 +68,5 @@ Use a custom context to set timeouts on your operations:
 			// handle error
 		}
 	}
-
 */
 package client

client/v2/go.mod

@@ -1,12 +1,17 @@
 module go.etcd.io/etcd/client/v2
 
-go 1.16
+go 1.20
 
 require (
-	github.com/json-iterator/go v1.1.10
+	github.com/json-iterator/go v1.1.11
 	github.com/modern-go/reflect2 v1.0.1
-	go.etcd.io/etcd/api/v3 v3.5.0-alpha.0
-	go.etcd.io/etcd/client/pkg/v3 v3.5.0-alpha.0
+	go.etcd.io/etcd/api/v3 v3.5.12
+	go.etcd.io/etcd/client/pkg/v3 v3.5.12
+)
+
+require (
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
 )
 
 replace (

client/v2/go.sum

@@ -1,145 +1,20 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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-google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3 h1:fvjTMHxHEw/mxHbtzPi3JCcKXQRAnQTBRo6YCJSVHKI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

client/v3/client.go

@@ -24,6 +24,7 @@ import (
 	"time"
 
 	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	"go.etcd.io/etcd/client/pkg/v3/logutil"
 	"go.etcd.io/etcd/client/v3/credentials"
 	"go.etcd.io/etcd/client/v3/internal/endpoint"
 	"go.etcd.io/etcd/client/v3/internal/resolver"
@@ -184,7 +185,9 @@ func (c *Client) Sync(ctx context.Context) error {
 	}
 	var eps []string
 	for _, m := range mresp.Members {
-		eps = append(eps, m.ClientURLs...)
+		if len(m.Name) != 0 && !m.IsLearner {
+			eps = append(eps, m.ClientURLs...)
+		}
 	}
 	c.SetEndpoints(eps...)
 	return nil
@@ -261,6 +264,7 @@ func (c *Client) getToken(ctx context.Context) error {
 	resp, err := c.Auth.Authenticate(ctx, c.Username, c.Password)
 	if err != nil {
 		if err == rpctypes.ErrAuthNotEnabled {
+			c.authTokenBundle.UpdateAuthToken("")
 			return nil
 		}
 		return err
@@ -283,8 +287,7 @@ func (c *Client) dial(creds grpccredentials.TransportCredentials, dopts ...grpc.
 	if err != nil {
 		return nil, fmt.Errorf("failed to configure dialer: %v", err)
 	}
-	if c.Username != "" && c.Password != "" {
-		c.authTokenBundle = credentials.NewBundle(credentials.Config{})
+	if c.authTokenBundle != nil {
 		opts = append(opts, grpc.WithPerRPCCredentials(c.authTokenBundle.PerRPCCredentials()))
 	}
 
@@ -296,9 +299,7 @@ func (c *Client) dial(creds grpccredentials.TransportCredentials, dopts ...grpc.
 		dctx, cancel = context.WithTimeout(c.ctx, c.cfg.DialTimeout)
 		defer cancel() // TODO: Is this right for cases where grpc.WithBlock() is not set on the dial options?
 	}
-
-	initialEndpoints := strings.Join(c.cfg.Endpoints, ";")
-	target := fmt.Sprintf("%s://%p/#initially=[%s]", resolver.Schema, c, initialEndpoints)
+	target := fmt.Sprintf("%s://%p/%s", resolver.Schema, c, authority(c.Endpoints()[0]))
 	conn, err := grpc.DialContext(dctx, target, opts...)
 	if err != nil {
 		return nil, err
@@ -306,6 +307,20 @@ func (c *Client) dial(creds grpccredentials.TransportCredentials, dopts ...grpc.
 	return conn, nil
 }
 
+func authority(endpoint string) string {
+	spl := strings.SplitN(endpoint, "://", 2)
+	if len(spl) < 2 {
+		if strings.HasPrefix(endpoint, "unix:") {
+			return endpoint[len("unix:"):]
+		}
+		if strings.HasPrefix(endpoint, "unixs:") {
+			return endpoint[len("unixs:"):]
+		}
+		return endpoint
+	}
+	return spl[1]
+}
+
 func (c *Client) credentialsForEndpoint(ep string) grpccredentials.TransportCredentials {
 	r := endpoint.RequiresCredentials(ep)
 	switch r {
@@ -356,7 +371,10 @@ func newClient(cfg *Config) (*Client, error) {
 	} else if cfg.LogConfig != nil {
 		client.lg, err = cfg.LogConfig.Build()
 	} else {
-		client.lg, err = createDefaultZapLogger()
+		client.lg, err = logutil.CreateDefaultZapLogger(etcdClientDebugLevel())
+		if client.lg != nil {
+			client.lg = client.lg.Named("etcd-client")
+		}
 	}
 	if err != nil {
 		return nil, err
@@ -365,6 +383,7 @@ func newClient(cfg *Config) (*Client, error) {
 	if cfg.Username != "" && cfg.Password != "" {
 		client.Username = cfg.Username
 		client.Password = cfg.Password
+		client.authTokenBundle = credentials.NewBundle(credentials.Config{})
 	}
 	if cfg.MaxCallSendMsgSize > 0 || cfg.MaxCallRecvMsgSize > 0 {
 		if cfg.MaxCallRecvMsgSize > 0 && cfg.MaxCallSendMsgSize > cfg.MaxCallRecvMsgSize {
@@ -483,7 +502,7 @@ func (c *Client) checkVersion() (err error) {
 					return
 				}
 			}
-			if maj < 3 || (maj == 3 && min < 2) {
+			if maj < 3 || (maj == 3 && min < 4) {
 				rerr = ErrOldCluster
 			}
 			errc <- rerr
@@ -491,7 +510,7 @@ func (c *Client) checkVersion() (err error) {
 	}
 	// wait for success
 	for range eps {
-		if err = <-errc; err == nil {
+		if err = <-errc; err != nil {
 			break
 		}
 	}

client/v3/client_test.go

@@ -17,13 +17,16 @@ package clientv3
 import (
 	"context"
 	"fmt"
-	"go.uber.org/zap"
+	"io"
 	"net"
+	"sync"
 	"testing"
 	"time"
 
+	"go.etcd.io/etcd/api/v3/etcdserverpb"
 	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
 	"go.etcd.io/etcd/client/pkg/v3/testutil"
+	"go.uber.org/zap"
 	"go.uber.org/zap/zaptest"
 
 	"google.golang.org/grpc"
@@ -35,7 +38,7 @@ func NewClient(t *testing.T, cfg Config) (*Client, error) {
 }
 
 func TestDialCancel(t *testing.T) {
-	testutil.BeforeTest(t)
+	testutil.RegisterLeakDetection(t)
 
 	// accept first connection so client is created with dial timeout
 	ln, err := net.Listen("unix", "dialcancel:12345")
@@ -87,7 +90,7 @@ func TestDialCancel(t *testing.T) {
 }
 
 func TestDialTimeout(t *testing.T) {
-	testutil.BeforeTest(t)
+	testutil.RegisterLeakDetection(t)
 
 	wantError := context.DeadlineExceeded
 
@@ -198,3 +201,194 @@ func TestZapWithLogger(t *testing.T) {
 		t.Errorf("WithZapLogger should modify *zap.Logger")
 	}
 }
+
+func TestAuthTokenBundleNoOverwrite(t *testing.T) {
+	// Create a mock AuthServer to handle Authenticate RPCs.
+	lis, err := net.Listen("unix", "etcd-auth-test:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer lis.Close()
+	addr := "unix:" + lis.Addr().String()
+	srv := grpc.NewServer()
+	etcdserverpb.RegisterAuthServer(srv, mockAuthServer{})
+	go srv.Serve(lis)
+	defer srv.Stop()
+
+	// Create a client, which should call Authenticate on the mock server to
+	// exchange username/password for an auth token.
+	c, err := NewClient(t, Config{
+		DialTimeout: 5 * time.Second,
+		Endpoints:   []string{addr},
+		Username:    "foo",
+		Password:    "bar",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	oldTokenBundle := c.authTokenBundle
+
+	// Call the public Dial again, which should preserve the original
+	// authTokenBundle.
+	gc, err := c.Dial(addr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer gc.Close()
+	newTokenBundle := c.authTokenBundle
+
+	if oldTokenBundle != newTokenBundle {
+		t.Error("Client.authTokenBundle has been overwritten during Client.Dial")
+	}
+}
+
+type mockAuthServer struct {
+	*etcdserverpb.UnimplementedAuthServer
+}
+
+func (mockAuthServer) Authenticate(context.Context, *etcdserverpb.AuthenticateRequest) (*etcdserverpb.AuthenticateResponse, error) {
+	return &etcdserverpb.AuthenticateResponse{Token: "mock-token"}, nil
+}
+
+func TestSyncFiltersMembers(t *testing.T) {
+	c, _ := NewClient(t, Config{Endpoints: []string{"http://254.0.0.1:12345"}})
+	defer c.Close()
+	c.Cluster = &mockCluster{
+		[]*etcdserverpb.Member{
+			{ID: 0, Name: "", ClientURLs: []string{"http://254.0.0.1:12345"}, IsLearner: false},
+			{ID: 1, Name: "isStarted", ClientURLs: []string{"http://254.0.0.2:12345"}, IsLearner: true},
+			{ID: 2, Name: "isStartedAndNotLearner", ClientURLs: []string{"http://254.0.0.3:12345"}, IsLearner: false},
+		},
+	}
+	c.Sync(context.Background())
+
+	endpoints := c.Endpoints()
+	if len(endpoints) != 1 || endpoints[0] != "http://254.0.0.3:12345" {
+		t.Error("Client.Sync uses learner and/or non-started member client URLs")
+	}
+}
+
+type mockCluster struct {
+	members []*etcdserverpb.Member
+}
+
+func (mc *mockCluster) MemberList(ctx context.Context) (*MemberListResponse, error) {
+	return &MemberListResponse{Members: mc.members}, nil
+}
+
+func (mc *mockCluster) MemberAdd(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
+	return nil, nil
+}
+
+func (mc *mockCluster) MemberAddAsLearner(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
+	return nil, nil
+}
+
+func (mc *mockCluster) MemberRemove(ctx context.Context, id uint64) (*MemberRemoveResponse, error) {
+	return nil, nil
+}
+
+func (mc *mockCluster) MemberUpdate(ctx context.Context, id uint64, peerAddrs []string) (*MemberUpdateResponse, error) {
+	return nil, nil
+}
+
+func (mc *mockCluster) MemberPromote(ctx context.Context, id uint64) (*MemberPromoteResponse, error) {
+	return nil, nil
+}
+
+func TestClientRejectOldCluster(t *testing.T) {
+	testutil.RegisterLeakDetection(t)
+	var tests = []struct {
+		name          string
+		endpoints     []string
+		versions      []string
+		expectedError error
+	}{
+		{
+			name:          "all new versions with the same value",
+			endpoints:     []string{"192.168.3.41:22379", "192.168.3.41:22479", "192.168.3.41:22579"},
+			versions:      []string{"3.5.4", "3.5.4", "3.5.4"},
+			expectedError: nil,
+		},
+		{
+			name:          "all new versions with different values",
+			endpoints:     []string{"192.168.3.41:22379", "192.168.3.41:22479", "192.168.3.41:22579"},
+			versions:      []string{"3.5.4", "3.5.4", "3.4.0"},
+			expectedError: nil,
+		},
+		{
+			name:          "all old versions with different values",
+			endpoints:     []string{"192.168.3.41:22379", "192.168.3.41:22479", "192.168.3.41:22579"},
+			versions:      []string{"3.3.0", "3.3.0", "3.4.0"},
+			expectedError: ErrOldCluster,
+		},
+		{
+			name:          "all old versions with the same value",
+			endpoints:     []string{"192.168.3.41:22379", "192.168.3.41:22479", "192.168.3.41:22579"},
+			versions:      []string{"3.3.0", "3.3.0", "3.3.0"},
+			expectedError: ErrOldCluster,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if len(tt.endpoints) != len(tt.versions) || len(tt.endpoints) == 0 {
+				t.Errorf("Unexpected endpoints and versions length, len(endpoints):%d, len(versions):%d", len(tt.endpoints), len(tt.versions))
+				return
+			}
+			endpointToVersion := make(map[string]string)
+			for j := range tt.endpoints {
+				endpointToVersion[tt.endpoints[j]] = tt.versions[j]
+			}
+			c := &Client{
+				ctx: context.Background(),
+				cfg: Config{
+					Endpoints: tt.endpoints,
+				},
+				mu: new(sync.RWMutex),
+				Maintenance: &mockMaintenance{
+					Version: endpointToVersion,
+				},
+			}
+
+			if err := c.checkVersion(); err != tt.expectedError {
+				t.Errorf("heckVersion err:%v", err)
+			}
+		})
+
+	}
+
+}
+
+type mockMaintenance struct {
+	Version map[string]string
+}
+
+func (mm mockMaintenance) Status(ctx context.Context, endpoint string) (*StatusResponse, error) {
+	return &StatusResponse{Version: mm.Version[endpoint]}, nil
+}
+
+func (mm mockMaintenance) AlarmList(ctx context.Context) (*AlarmResponse, error) {
+	return nil, nil
+}
+
+func (mm mockMaintenance) AlarmDisarm(ctx context.Context, m *AlarmMember) (*AlarmResponse, error) {
+	return nil, nil
+}
+
+func (mm mockMaintenance) Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error) {
+	return nil, nil
+}
+
+func (mm mockMaintenance) HashKV(ctx context.Context, endpoint string, rev int64) (*HashKVResponse, error) {
+	return nil, nil
+}
+
+func (mm mockMaintenance) Snapshot(ctx context.Context) (io.ReadCloser, error) {
+	return nil, nil
+}
+
+func (mm mockMaintenance) MoveLeader(ctx context.Context, transfereeID uint64) (*MoveLeaderResponse, error) {
+	return nil, nil
+}

client/v3/doc.go

@@ -61,7 +61,8 @@
 //
 //  1. context error: canceled or deadline exceeded.
 //  2. gRPC error: e.g. when clock drifts in server-side before client's context deadline exceeded.
-//  See https://github.com/etcd-io/etcd/blob/main/api/v3rpc/rpctypes/error.go
+//
+// See https://github.com/etcd-io/etcd/blob/main/api/v3rpc/rpctypes/error.go
 //
 // Here is the example code to handle client errors:
 //
@@ -102,5 +103,4 @@
 // The grpc load balancer is registered statically and is shared across etcd clients.
 // To enable detailed load balancer logging, set the ETCD_CLIENT_DEBUG environment
 // variable.  E.g. "ETCD_CLIENT_DEBUG=1".
-//
 package clientv3

client/v3/experimental/recipes/barrier.go

@@ -49,7 +49,7 @@ func (b *Barrier) Release() error {
 // Wait blocks on the barrier key until it is deleted. If there is no key, Wait
 // assumes Release has already been called and returns immediately.
 func (b *Barrier) Wait() error {
-	resp, err := b.client.Get(b.ctx, b.key, v3.WithFirstKey()...)
+	resp, err := b.client.Get(b.ctx, b.key)
 	if err != nil {
 		return err
 	}

client/v3/experimental/recipes/double_barrier.go

@@ -45,25 +45,46 @@ func NewDoubleBarrier(s *concurrency.Session, key string, count int) *DoubleBarr
 // Enter waits for "count" processes to enter the barrier then returns
 func (b *DoubleBarrier) Enter() error {
 	client := b.s.Client()
+
+	// Check the entered clients before creating the UniqueEphemeralKey,
+	// fail the request if there are already too many clients.
+	if resp1, err := b.enteredClients(client); err != nil {
+		return err
+	} else if len(resp1.Kvs) >= b.count {
+		return ErrTooManyClients
+	}
+
 	ek, err := newUniqueEphemeralKey(b.s, b.key+"/waiters")
 	if err != nil {
 		return err
 	}
 	b.myKey = ek
 
-	resp, err := client.Get(b.ctx, b.key+"/waiters", clientv3.WithPrefix())
+	// Check the entered clients after creating the UniqueEphemeralKey
+	resp2, err := b.enteredClients(client)
 	if err != nil {
 		return err
 	}
+	if len(resp2.Kvs) >= b.count {
+		lastWaiter := resp2.Kvs[b.count-1]
+		if ek.rev > lastWaiter.CreateRevision {
+			// delete itself now, otherwise other processes may need to wait
+			// until these keys are automatically deleted when the related
+			// lease expires.
+			if err = b.myKey.Delete(); err != nil {
+				// Nothing to do here. We have to wait for the key to be
+				// deleted when the lease expires.
+			}
+			return ErrTooManyClients
+		}
 
-	if len(resp.Kvs) > b.count {
-		return ErrTooManyClients
-	}
-
-	if len(resp.Kvs) == b.count {
-		// unblock waiters
-		_, err = client.Put(b.ctx, b.key+"/ready", "")
-		return err
+		if ek.rev == lastWaiter.CreateRevision {
+			// TODO(ahrtr): we might need to compare ek.key and
+			// string(lastWaiter.Key), they should be equal.
+			// unblock all other waiters
+			_, err = client.Put(b.ctx, b.key+"/ready", "")
+			return err
+		}
 	}
 
 	_, err = WaitEvents(
@@ -74,6 +95,18 @@ func (b *DoubleBarrier) Enter() error {
 	return err
 }
 
+// enteredClients gets all the entered clients, which are ordered by the
+// createRevision in ascending order.
+func (b *DoubleBarrier) enteredClients(cli *clientv3.Client) (*clientv3.GetResponse, error) {
+	resp, err := cli.Get(b.ctx, b.key+"/waiters", clientv3.WithPrefix(),
+		clientv3.WithSort(clientv3.SortByCreateRevision, clientv3.SortAscend))
+	if err != nil {
+		return nil, err
+	}
+
+	return resp, nil
+}
+
 // Leave waits for "count" processes to leave the barrier then returns
 func (b *DoubleBarrier) Leave() error {
 	client := b.s.Client()
@@ -96,7 +129,7 @@ func (b *DoubleBarrier) Leave() error {
 	}
 	isLowest := string(lowest.Key) == b.myKey.Key()
 
-	if len(resp.Kvs) == 1 {
+	if len(resp.Kvs) == 1 && isLowest {
 		// this is the only node in the barrier; finish up
 		if _, err = client.Delete(b.ctx, b.key+"/ready"); err != nil {
 			return err

client/v3/go.mod

@@ -1,18 +1,41 @@
 module go.etcd.io/etcd/client/v3
 
-go 1.16
+go 1.20
 
 require (
 	github.com/dustin/go-humanize v1.0.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
-	github.com/prometheus/client_golang v1.5.1
-	go.etcd.io/etcd/api/v3 v3.5.0-alpha.0
-	go.etcd.io/etcd/client/pkg/v3 v3.5.0-alpha.0
-	go.uber.org/zap v1.16.1-0.20210329175301-c23abee72d19
-	google.golang.org/grpc v1.37.0
+	github.com/prometheus/client_golang v1.11.1
+	go.etcd.io/etcd/api/v3 v3.5.12
+	go.etcd.io/etcd/client/pkg/v3 v3.5.12
+	go.uber.org/zap v1.17.0
+	google.golang.org/grpc v1.59.0
 	sigs.k8s.io/yaml v1.2.0
 )
 
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	google.golang.org/genproto v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
+
 replace (
 	go.etcd.io/etcd/api/v3 => ../../api
 	go.etcd.io/etcd/client/pkg/v3 => ../pkg

client/v3/go.sum

@@ -1,79 +1,68 @@
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@@ -87,141 +76,133 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
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 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

client/v3/internal/endpoint/endpoint.go

@@ -41,12 +41,8 @@ func extractHostFromHostPort(ep string) string {
 	return host
 }
 
-func extractHostFromPath(pathStr string) string {
-	return extractHostFromHostPort(path.Base(pathStr))
-}
-
-//mustSplit2 returns the values from strings.SplitN(s, sep, 2).
-//If sep is not found, it returns ("", "", false) instead.
+// mustSplit2 returns the values from strings.SplitN(s, sep, 2).
+// If sep is not found, it returns ("", "", false) instead.
 func mustSplit2(s, sep string) (string, string) {
 	spl := strings.SplitN(s, sep, 2)
 	if len(spl) < 2 {
@@ -81,11 +77,12 @@ func schemeToCredsRequirement(schema string) CredsRequirement {
 // The main differences:
 //   - etcd supports unixs & https names as opposed to unix & http to
 //     distinguish need to configure certificates.
-//  -  etcd support http(s) names as opposed to tcp supported by grpc/dial method.
-//  -  etcd supports unix(s)://local-file naming schema
+//   - etcd support http(s) names as opposed to tcp supported by grpc/dial method.
+//   - etcd supports unix(s)://local-file naming schema
 //     (as opposed to unix:local-file canonical name used by grpc for current dir files).
-//  - Within the unix(s) schemas, the last segment (filename) without 'port' (content after colon)
-//    is considered serverName - to allow local testing of cert-protected communication.
+//   - Within the unix(s) schemas, the last segment (filename) without 'port' (content after colon)
+//     is considered serverName - to allow local testing of cert-protected communication.
+//
 // See more:
 //   - https://github.com/grpc/grpc-go/blob/26c143bd5f59344a4b8a1e491e0f5e18aa97abc7/internal/grpcutil/target.go#L47
 //   - https://golang.org/pkg/net/#Dial
@@ -95,29 +92,29 @@ func translateEndpoint(ep string) (addr string, serverName string, requireCreds
 		if strings.HasPrefix(ep, "unix:///") || strings.HasPrefix(ep, "unixs:///") {
 			// absolute path case
 			schema, absolutePath := mustSplit2(ep, "://")
-			return "unix://" + absolutePath, extractHostFromPath(absolutePath), schemeToCredsRequirement(schema)
+			return "unix://" + absolutePath, path.Base(absolutePath), schemeToCredsRequirement(schema)
 		}
 		if strings.HasPrefix(ep, "unix://") || strings.HasPrefix(ep, "unixs://") {
 			// legacy etcd local path
 			schema, localPath := mustSplit2(ep, "://")
-			return "unix:" + localPath, extractHostFromPath(localPath), schemeToCredsRequirement(schema)
+			return "unix:" + localPath, path.Base(localPath), schemeToCredsRequirement(schema)
 		}
 		schema, localPath := mustSplit2(ep, ":")
-		return "unix:" + localPath, extractHostFromPath(localPath), schemeToCredsRequirement(schema)
+		return "unix:" + localPath, path.Base(localPath), schemeToCredsRequirement(schema)
 	}
 
 	if strings.Contains(ep, "://") {
 		url, err := url.Parse(ep)
 		if err != nil {
-			return ep, extractHostFromHostPort(ep), CREDS_OPTIONAL
+			return ep, ep, CREDS_OPTIONAL
 		}
 		if url.Scheme == "http" || url.Scheme == "https" {
-			return url.Host, url.Hostname(), schemeToCredsRequirement(url.Scheme)
+			return url.Host, url.Host, schemeToCredsRequirement(url.Scheme)
 		}
-		return ep, url.Hostname(), schemeToCredsRequirement(url.Scheme)
+		return ep, url.Host, schemeToCredsRequirement(url.Scheme)
 	}
 	// Handles plain addresses like 10.0.0.44:437.
-	return ep, extractHostFromHostPort(ep), CREDS_OPTIONAL
+	return ep, ep, CREDS_OPTIONAL
 }
 
 // RequiresCredentials returns whether given endpoint requires

client/v3/internal/endpoint/endpoint_test.go

@@ -27,35 +27,35 @@ func Test_interpret(t *testing.T) {
 	}{
 		{"127.0.0.1", "127.0.0.1", "127.0.0.1", CREDS_OPTIONAL},
 		{"localhost", "localhost", "localhost", CREDS_OPTIONAL},
-		{"localhost:8080", "localhost:8080", "localhost", CREDS_OPTIONAL},
+		{"localhost:8080", "localhost:8080", "localhost:8080", CREDS_OPTIONAL},
 
 		{"unix:127.0.0.1", "unix:127.0.0.1", "127.0.0.1", CREDS_OPTIONAL},
-		{"unix:127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1", CREDS_OPTIONAL},
+		{"unix:127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1:8080", CREDS_OPTIONAL},
 
 		{"unix://127.0.0.1", "unix:127.0.0.1", "127.0.0.1", CREDS_OPTIONAL},
-		{"unix://127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1", CREDS_OPTIONAL},
+		{"unix://127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1:8080", CREDS_OPTIONAL},
 
 		{"unixs:127.0.0.1", "unix:127.0.0.1", "127.0.0.1", CREDS_REQUIRE},
-		{"unixs:127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1", CREDS_REQUIRE},
+		{"unixs:127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1:8080", CREDS_REQUIRE},
 		{"unixs://127.0.0.1", "unix:127.0.0.1", "127.0.0.1", CREDS_REQUIRE},
-		{"unixs://127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1", CREDS_REQUIRE},
+		{"unixs://127.0.0.1:8080", "unix:127.0.0.1:8080", "127.0.0.1:8080", CREDS_REQUIRE},
 
 		{"http://127.0.0.1", "127.0.0.1", "127.0.0.1", CREDS_DROP},
-		{"http://127.0.0.1:8080", "127.0.0.1:8080", "127.0.0.1", CREDS_DROP},
+		{"http://127.0.0.1:8080", "127.0.0.1:8080", "127.0.0.1:8080", CREDS_DROP},
 		{"https://127.0.0.1", "127.0.0.1", "127.0.0.1", CREDS_REQUIRE},
-		{"https://127.0.0.1:8080", "127.0.0.1:8080", "127.0.0.1", CREDS_REQUIRE},
-		{"https://localhost:20000", "localhost:20000", "localhost", CREDS_REQUIRE},
+		{"https://127.0.0.1:8080", "127.0.0.1:8080", "127.0.0.1:8080", CREDS_REQUIRE},
+		{"https://localhost:20000", "localhost:20000", "localhost:20000", CREDS_REQUIRE},
 
 		{"unix:///tmp/abc", "unix:///tmp/abc", "abc", CREDS_OPTIONAL},
 		{"unixs:///tmp/abc", "unix:///tmp/abc", "abc", CREDS_REQUIRE},
-		{"unix:///tmp/abc:1234", "unix:///tmp/abc:1234", "abc", CREDS_OPTIONAL},
-		{"unixs:///tmp/abc:1234", "unix:///tmp/abc:1234", "abc", CREDS_REQUIRE},
+		{"unix:///tmp/abc:1234", "unix:///tmp/abc:1234", "abc:1234", CREDS_OPTIONAL},
+		{"unixs:///tmp/abc:1234", "unix:///tmp/abc:1234", "abc:1234", CREDS_REQUIRE},
 		{"etcd.io", "etcd.io", "etcd.io", CREDS_OPTIONAL},
 		{"http://etcd.io/abc", "etcd.io", "etcd.io", CREDS_DROP},
 		{"dns://something-other", "dns://something-other", "something-other", CREDS_OPTIONAL},
 
-		{"http://[2001:db8:1f70::999:de8:7648:6e8]:100/", "[2001:db8:1f70::999:de8:7648:6e8]:100", "2001:db8:1f70::999:de8:7648:6e8", CREDS_DROP},
-		{"[2001:db8:1f70::999:de8:7648:6e8]:100", "[2001:db8:1f70::999:de8:7648:6e8]:100", "2001:db8:1f70::999:de8:7648:6e8", CREDS_OPTIONAL},
+		{"http://[2001:db8:1f70::999:de8:7648:6e8]:100/", "[2001:db8:1f70::999:de8:7648:6e8]:100", "[2001:db8:1f70::999:de8:7648:6e8]:100", CREDS_DROP},
+		{"[2001:db8:1f70::999:de8:7648:6e8]:100", "[2001:db8:1f70::999:de8:7648:6e8]:100", "[2001:db8:1f70::999:de8:7648:6e8]:100", CREDS_OPTIONAL},
 		{"unix:unexpected-file_name#123$456", "unix:unexpected-file_name#123$456", "unexpected-file_name#123$456", CREDS_OPTIONAL},
 	}
 	for _, tt := range tests {

client/v3/lease.go

@@ -294,7 +294,9 @@ func (l *lessor) KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAl
 	}
 	l.mu.Unlock()
 
-	go l.keepAliveCtxCloser(ctx, id, ka.donec)
+	if ctx.Done() != nil {
+		go l.keepAliveCtxCloser(ctx, id, ka.donec)
+	}
 	l.firstKeepAliveOnce.Do(func() {
 		go l.recvKeepAliveLoop()
 		go l.deadlineLoop()
@@ -397,7 +399,7 @@ func (l *lessor) closeRequireLeader() {
 	}
 }
 
-func (l *lessor) keepAliveOnce(ctx context.Context, id LeaseID) (*LeaseKeepAliveResponse, error) {
+func (l *lessor) keepAliveOnce(ctx context.Context, id LeaseID) (karesp *LeaseKeepAliveResponse, ferr error) {
 	cctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
@@ -406,6 +408,15 @@ func (l *lessor) keepAliveOnce(ctx context.Context, id LeaseID) (*LeaseKeepAlive
 		return nil, toErr(ctx, err)
 	}
 
+	defer func() {
+		if err := stream.CloseSend(); err != nil {
+			if ferr == nil {
+				ferr = toErr(ctx, err)
+			}
+			return
+		}
+	}()
+
 	err = stream.Send(&pb.LeaseKeepAliveRequest{ID: int64(id)})
 	if err != nil {
 		return nil, toErr(ctx, err)
@@ -416,7 +427,7 @@ func (l *lessor) keepAliveOnce(ctx context.Context, id LeaseID) (*LeaseKeepAlive
 		return nil, toErr(ctx, rerr)
 	}
 
-	karesp := &LeaseKeepAliveResponse{
+	karesp = &LeaseKeepAliveResponse{
 		ResponseHeader: resp.GetHeader(),
 		ID:             LeaseID(resp.ID),
 		TTL:            resp.TTL,

client/v3/leasing/doc.go

@@ -19,28 +19,27 @@
 //
 // First, create a leasing KV from a clientv3.Client 'cli':
 //
-//     lkv, err := leasing.NewKV(cli, "leasing-prefix")
-//     if err != nil {
-//         // handle error
-//     }
+//	lkv, err := leasing.NewKV(cli, "leasing-prefix")
+//	if err != nil {
+//	    // handle error
+//	}
 //
 // A range request for a key "abc" tries to acquire a leasing key so it can cache the range's
 // key locally. On the server, the leasing key is stored to "leasing-prefix/abc":
 //
-//     resp, err := lkv.Get(context.TODO(), "abc")
+//	resp, err := lkv.Get(context.TODO(), "abc")
 //
 // Future linearized read requests using 'lkv' will be served locally for the lease's lifetime:
 //
-//     resp, err = lkv.Get(context.TODO(), "abc")
+//	resp, err = lkv.Get(context.TODO(), "abc")
 //
 // If another leasing client writes to a leased key, then the owner relinquishes its exclusive
 // access, permitting the writer to modify the key:
 //
-//     lkv2, err := leasing.NewKV(cli, "leasing-prefix")
-//     if err != nil {
-//         // handle error
-//     }
-//     lkv2.Put(context.TODO(), "abc", "456")
-//     resp, err = lkv.Get("abc")
-//
+//	lkv2, err := leasing.NewKV(cli, "leasing-prefix")
+//	if err != nil {
+//	    // handle error
+//	}
+//	lkv2.Put(context.TODO(), "abc", "456")
+//	resp, err = lkv.Get("abc")
 package leasing

client/v3/logger.go

@@ -19,8 +19,8 @@ import (
 	"os"
 
 	"go.etcd.io/etcd/client/pkg/v3/logutil"
-	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"go.uber.org/zap/zapgrpc"
 	"google.golang.org/grpc/grpclog"
 )
 
@@ -28,14 +28,12 @@ func init() {
 	// We override grpc logger only when the environment variable is set
 	// in order to not interfere by default with user's code or other libraries.
 	if os.Getenv("ETCD_CLIENT_DEBUG") != "" {
-		// We don't use grpc_zap.ReplaceGrpcLoggerV2(lg) to not push (wide) set
-		// of grpc-ecosystem/go-grpc-middleware dependencies on etcd-client users.
-		lg, err := logutil.NewGRPCLoggerV2(createDefaultZapLoggerConfig())
+		lg, err := logutil.CreateDefaultZapLogger(etcdClientDebugLevel())
 		if err != nil {
 			panic(err)
 		}
-
-		grpclog.SetLoggerV2(lg)
+		lg = lg.Named("etcd-client")
+		grpclog.SetLoggerV2(zapgrpc.NewLogger(lg))
 	}
 }
 
@@ -53,23 +51,9 @@ func etcdClientDebugLevel() zapcore.Level {
 		return zapcore.InfoLevel
 	}
 	var l zapcore.Level
-	if err := l.Set(envLevel); err == nil {
-		log.Printf("Deprecated env ETCD_CLIENT_DEBUG value. Using default level: 'info'")
+	if err := l.Set(envLevel); err != nil {
+		log.Printf("Invalid value for environment variable 'ETCD_CLIENT_DEBUG'. Using default level: 'info'")
 		return zapcore.InfoLevel
 	}
 	return l
 }
-
-func createDefaultZapLoggerConfig() zap.Config {
-	lcfg := logutil.DefaultZapLoggerConfig
-	lcfg.Level = zap.NewAtomicLevelAt(etcdClientDebugLevel())
-	return lcfg
-}
-
-func createDefaultZapLogger() (*zap.Logger, error) {
-	c, err := createDefaultZapLoggerConfig().Build()
-	if err != nil {
-		return nil, err
-	}
-	return c.Named("etcd-client"), nil
-}

client/v3/maintenance.go

@@ -92,6 +92,7 @@ func NewMaintenance(c *Client) Maintenance {
 			err = c.getToken(dctx)
 			cancel()
 			if err != nil {
+				conn.Close()
 				return nil, nil, fmt.Errorf("failed to getToken from endpoint %s with maintenance client: %v", endpoint, err)
 			}
 			cancel = func() { conn.Close() }

client/v3/mirror/syncer.go

@@ -18,7 +18,7 @@ package mirror
 import (
 	"context"
 
-	"go.etcd.io/etcd/client/v3"
+	clientv3 "go.etcd.io/etcd/client/v3"
 )
 
 const (
@@ -52,7 +52,13 @@ func (s *syncer) SyncBase(ctx context.Context) (<-chan clientv3.GetResponse, cha
 
 	// if rev is not specified, we will choose the most recent revision.
 	if s.rev == 0 {
-		resp, err := s.c.Get(ctx, "foo")
+		// If len(s.prefix) == 0, we will check a random key to fetch the most recent
+		// revision (foo), otherwise we use the provided prefix.
+		checkPath := "foo"
+		if len(s.prefix) != 0 {
+			checkPath = s.prefix
+		}
+		resp, err := s.c.Get(ctx, checkPath)
 		if err != nil {
 			errchan <- err
 			close(respchan)

client/v3/namespace/doc.go

@@ -39,5 +39,4 @@
 //	resp, _ = cli.Get(context.TODO(), "abc")
 //	fmt.Printf("%s\n", resp.Kvs[0].Value)
 //	// Output: 456
-//
 package namespace

client/v3/naming/doc.go

@@ -13,10 +13,10 @@
 // limitations under the License.
 
 // Package naming provides:
-//	- subpackage endpoints: an abstraction layer to store and read endpoints
-//		information from etcd.
-//	- subpackage resolver: an etcd-backed gRPC resolver for discovering gRPC
-//		services based on the endpoints configuration
+//   - subpackage endpoints: an abstraction layer to store and read endpoints
+//     information from etcd.
+//   - subpackage resolver: an etcd-backed gRPC resolver for discovering gRPC
+//     services based on the endpoints configuration
 //
 // To use, first import the packages:
 //
@@ -55,5 +55,4 @@
 //		em := endpoints.NewManager(c, service)
 //		return em.AddEndpoint(c.Ctx(), service+"/"+addr, endpoints.Endpoint{Addr:addr}, clientv3.WithLease(lid));
 //	}
-//
 package naming

client/v3/naming/endpoints/endpoints_impl.go

@@ -78,7 +78,8 @@ func (m *endpointManager) DeleteEndpoint(ctx context.Context, key string, opts .
 }
 
 func (m *endpointManager) NewWatchChannel(ctx context.Context) (WatchChannel, error) {
-	resp, err := m.client.Get(ctx, m.target, clientv3.WithPrefix(), clientv3.WithSerializable())
+	key := m.target + "/"
+	resp, err := m.client.Get(ctx, key, clientv3.WithPrefix(), clientv3.WithSerializable())
 	if err != nil {
 		return nil, err
 	}
@@ -112,7 +113,8 @@ func (m *endpointManager) watch(ctx context.Context, rev int64, upch chan []*Upd
 
 	lg := m.client.GetLogger()
 	opts := []clientv3.OpOption{clientv3.WithRev(rev), clientv3.WithPrefix()}
-	wch := m.client.Watch(ctx, m.target, opts...)
+	key := m.target + "/"
+	wch := m.client.Watch(ctx, key, opts...)
 	for {
 		select {
 		case <-ctx.Done():
@@ -157,7 +159,8 @@ func (m *endpointManager) watch(ctx context.Context, rev int64, upch chan []*Upd
 }
 
 func (m *endpointManager) List(ctx context.Context) (Key2EndpointMap, error) {
-	resp, err := m.client.Get(ctx, m.target, clientv3.WithPrefix(), clientv3.WithSerializable())
+	key := m.target + "/"
+	resp, err := m.client.Get(ctx, key, clientv3.WithPrefix(), clientv3.WithSerializable())
 	if err != nil {
 		return nil, err
 	}

client/v3/naming/resolver/resolver.go

@@ -2,6 +2,7 @@ package resolver
 
 import (
 	"context"
+	"strings"
 	"sync"
 
 	clientv3 "go.etcd.io/etcd/client/v3"
@@ -17,9 +18,15 @@ type builder struct {
 }
 
 func (b builder) Build(target gresolver.Target, cc gresolver.ClientConn, opts gresolver.BuildOptions) (gresolver.Resolver, error) {
+	// Refer to https://github.com/grpc/grpc-go/blob/16d3df80f029f57cff5458f1d6da6aedbc23545d/clientconn.go#L1587-L1611
+	endpoint := target.URL.Path
+	if endpoint == "" {
+		endpoint = target.URL.Opaque
+	}
+	endpoint = strings.TrimPrefix(endpoint, "/")
 	r := &resolver{
 		c:      b.c,
-		target: target.Endpoint,
+		target: endpoint,
 		cc:     cc,
 	}
 	r.ctx, r.cancel = context.WithCancel(context.Background())

client/v3/op.go

@@ -77,6 +77,9 @@ type Op struct {
 	cmps    []Cmp
 	thenOps []Op
 	elseOps []Op
+
+	isOptsWithFromKey bool
+	isOptsWithPrefix  bool
 }
 
 // accessors / mutators
@@ -216,6 +219,10 @@ func (op Op) isWrite() bool {
 	return op.t != tRange
 }
 
+func NewOp() *Op {
+	return &Op{key: []byte("")}
+}
+
 // OpGet returns "get" operation based on given key and operation options.
 func OpGet(key string, opts ...OpOption) Op {
 	// WithPrefix and WithFromKey are not supported together
@@ -382,6 +389,7 @@ func getPrefix(key []byte) []byte {
 // can return 'foo1', 'foo2', and so on.
 func WithPrefix() OpOption {
 	return func(op *Op) {
+		op.isOptsWithPrefix = true
 		if len(op.key) == 0 {
 			op.key, op.end = []byte{0}, []byte{0}
 			return
@@ -406,6 +414,7 @@ func WithFromKey() OpOption {
 			op.key = []byte{0}
 		}
 		op.end = []byte("\x00")
+		op.isOptsWithFromKey = true
 	}
 }
 
@@ -554,7 +563,21 @@ func toLeaseTimeToLiveRequest(id LeaseID, opts ...LeaseOption) *pb.LeaseTimeToLi
 }
 
 // IsOptsWithPrefix returns true if WithPrefix option is called in the given opts.
-func IsOptsWithPrefix(opts []OpOption) bool { return isOpFuncCalled("WithPrefix", opts) }
+func IsOptsWithPrefix(opts []OpOption) bool {
+	ret := NewOp()
+	for _, opt := range opts {
+		opt(ret)
+	}
+
+	return ret.isOptsWithPrefix
+}
 
 // IsOptsWithFromKey returns true if WithFromKey option is called in the given opts.
-func IsOptsWithFromKey(opts []OpOption) bool { return isOpFuncCalled("WithFromKey", opts) }
+func IsOptsWithFromKey(opts []OpOption) bool {
+	ret := NewOp()
+	for _, opt := range opts {
+		opt(ret)
+	}
+
+	return ret.isOptsWithFromKey
+}

client/v3/op_test.go

@@ -36,3 +36,27 @@ func TestOpWithSort(t *testing.T) {
 		t.Fatalf("expected %+v, got %+v", wreq, req)
 	}
 }
+
+func TestIsOptsWithPrefix(t *testing.T) {
+	optswithprefix := []OpOption{WithPrefix()}
+	if !IsOptsWithPrefix(optswithprefix) {
+		t.Errorf("IsOptsWithPrefix = false, expected true")
+	}
+
+	optswithfromkey := []OpOption{WithFromKey()}
+	if IsOptsWithPrefix(optswithfromkey) {
+		t.Errorf("IsOptsWithPrefix = true, expected false")
+	}
+}
+
+func TestIsOptsWithFromKey(t *testing.T) {
+	optswithfromkey := []OpOption{WithFromKey()}
+	if !IsOptsWithFromKey(optswithfromkey) {
+		t.Errorf("IsOptsWithFromKey = false, expected true")
+	}
+
+	optswithprefix := []OpOption{WithPrefix()}
+	if IsOptsWithFromKey(optswithprefix) {
+		t.Errorf("IsOptsWithFromKey = true, expected false")
+	}
+}

client/v3/ordering/doc.go

@@ -38,5 +38,4 @@
 //	cli.KV = ordering.NewKV(cli.KV, vf)
 //
 // Now calls using 'cli' will reject order violations with an error.
-//
 package ordering

client/v3/retry_interceptor.go

@@ -73,14 +73,8 @@ func (c *Client) unaryClientInterceptor(optFuncs ...retryOption) grpc.UnaryClien
 				// its the callCtx deadline or cancellation, in which case try again.
 				continue
 			}
-			if callOpts.retryAuth && rpctypes.Error(lastErr) == rpctypes.ErrInvalidAuthToken {
-				// clear auth token before refreshing it.
-				// call c.Auth.Authenticate with an invalid token will always fail the auth check on the server-side,
-				// if the server has not apply the patch of pr #12165 (https://github.com/etcd-io/etcd/pull/12165)
-				// and a rpctypes.ErrInvalidAuthToken will recursively call c.getToken until system run out of resource.
-				c.authTokenBundle.UpdateAuthToken("")
-
-				gterr := c.getToken(ctx)
+			if c.shouldRefreshToken(lastErr, callOpts) {
+				gterr := c.refreshToken(ctx)
 				if gterr != nil {
 					c.GetLogger().Warn(
 						"retrying of unary invoker failed to fetch new auth token",
@@ -148,6 +142,37 @@ func (c *Client) streamClientInterceptor(optFuncs ...retryOption) grpc.StreamCli
 	}
 }
 
+// shouldRefreshToken checks whether there's a need to refresh the token based on the error and callOptions,
+// and returns a boolean value.
+func (c *Client) shouldRefreshToken(err error, callOpts *options) bool {
+	if rpctypes.Error(err) == rpctypes.ErrUserEmpty {
+		// refresh the token when username, password is present but the server returns ErrUserEmpty
+		// which is possible when the client token is cleared somehow
+		return c.authTokenBundle != nil // equal to c.Username != "" && c.Password != ""
+	}
+
+	return callOpts.retryAuth &&
+		(rpctypes.Error(err) == rpctypes.ErrInvalidAuthToken || rpctypes.Error(err) == rpctypes.ErrAuthOldRevision)
+}
+
+func (c *Client) refreshToken(ctx context.Context) error {
+	if c.authTokenBundle == nil {
+		// c.authTokenBundle will be initialized only when
+		// c.Username != "" && c.Password != "".
+		//
+		// When users use the TLS CommonName based authentication, the
+		// authTokenBundle is always nil. But it's possible for the clients
+		// to get `rpctypes.ErrAuthOldRevision` response when the clients
+		// concurrently modify auth data (e.g, addUser, deleteUser etc.).
+		// In this case, there is no need to refresh the token; instead the
+		// clients just need to retry the operations (e.g. Put, Delete etc).
+		return nil
+	}
+	// clear auth token before refreshing it.
+	c.authTokenBundle.UpdateAuthToken("")
+	return c.getToken(ctx)
+}
+
 // type serverStreamingRetryingStream is the implementation of grpc.ClientStream that acts as a
 // proxy to the underlying call. If any of the RecvMsg() calls fail, it will try to reestablish
 // a new ClientStream according to the retry policy.
@@ -245,11 +270,8 @@ func (s *serverStreamingRetryingStream) receiveMsgAndIndicateRetry(m interface{}
 		// its the callCtx deadline or cancellation, in which case try again.
 		return true, err
 	}
-	if s.callOpts.retryAuth && rpctypes.Error(err) == rpctypes.ErrInvalidAuthToken {
-		// clear auth token to avoid failure when call getToken
-		s.client.authTokenBundle.UpdateAuthToken("")
-
-		gterr := s.client.getToken(s.ctx)
+	if s.client.shouldRefreshToken(err, s.callOpts) {
+		gterr := s.client.refreshToken(s.ctx)
 		if gterr != nil {
 			s.client.lg.Warn("retry failed to fetch new auth token", zap.Error(gterr))
 			return false, err // return the original error for simplicity

client/v3/retry_interceptor_test.go

@@ -0,0 +1,124 @@
+package clientv3
+
+import (
+	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	"go.etcd.io/etcd/client/v3/credentials"
+	grpccredentials "google.golang.org/grpc/credentials"
+	"testing"
+)
+
+type dummyAuthTokenBundle struct{}
+
+func (d dummyAuthTokenBundle) TransportCredentials() grpccredentials.TransportCredentials {
+	return nil
+}
+
+func (d dummyAuthTokenBundle) PerRPCCredentials() grpccredentials.PerRPCCredentials {
+	return nil
+}
+
+func (d dummyAuthTokenBundle) NewWithMode(mode string) (grpccredentials.Bundle, error) {
+	return nil, nil
+}
+
+func (d dummyAuthTokenBundle) UpdateAuthToken(token string) {
+}
+
+func TestClientShouldRefreshToken(t *testing.T) {
+	type fields struct {
+		authTokenBundle credentials.Bundle
+	}
+	type args struct {
+		err      error
+		callOpts *options
+	}
+
+	optsWithTrue := &options{
+		retryAuth: true,
+	}
+	optsWithFalse := &options{
+		retryAuth: false,
+	}
+
+	tests := []struct {
+		name   string
+		fields fields
+		args   args
+		want   bool
+	}{
+		{
+			name: "ErrUserEmpty and non nil authTokenBundle",
+			fields: fields{
+				authTokenBundle: &dummyAuthTokenBundle{},
+			},
+			args: args{rpctypes.ErrGRPCUserEmpty, optsWithTrue},
+			want: true,
+		},
+		{
+			name: "ErrUserEmpty and nil authTokenBundle",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCUserEmpty, optsWithTrue},
+			want: false,
+		},
+		{
+			name: "ErrGRPCInvalidAuthToken and retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCInvalidAuthToken, optsWithTrue},
+			want: true,
+		},
+		{
+			name: "ErrGRPCInvalidAuthToken and !retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCInvalidAuthToken, optsWithFalse},
+			want: false,
+		},
+		{
+			name: "ErrGRPCAuthOldRevision and retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCAuthOldRevision, optsWithTrue},
+			want: true,
+		},
+		{
+			name: "ErrGRPCAuthOldRevision and !retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCAuthOldRevision, optsWithFalse},
+			want: false,
+		},
+		{
+			name: "Other error and retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCAuthFailed, optsWithTrue},
+			want: false,
+		},
+		{
+			name: "Other error and !retryAuth",
+			fields: fields{
+				authTokenBundle: nil,
+			},
+			args: args{rpctypes.ErrGRPCAuthFailed, optsWithFalse},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c := &Client{
+				authTokenBundle: tt.fields.authTokenBundle,
+			}
+			if got := c.shouldRefreshToken(tt.args.err, tt.args.callOpts); got != tt.want {
+				t.Errorf("shouldRefreshToken() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

client/v3/snapshot/v3_snapshot.go

@@ -44,9 +44,6 @@ func hasChecksum(n int64) bool {
 // selected node, and saved snapshot is the point-in-time state of
 // the selected node.
 func Save(ctx context.Context, lg *zap.Logger, cfg clientv3.Config, dbPath string) error {
-	if lg == nil {
-		lg = zap.NewExample()
-	}
 	cfg.Logger = lg.Named("client")
 	if len(cfg.Endpoints) != 1 {
 		return fmt.Errorf("snapshot must be requested to one selected node, not multiple %v", cfg.Endpoints)

client/v3/txn.go

@@ -25,15 +25,14 @@ import (
 
 // Txn is the interface that wraps mini-transactions.
 //
-//	 Txn(context.TODO()).If(
-//	  Compare(Value(k1), ">", v1),
-//	  Compare(Version(k1), "=", 2)
-//	 ).Then(
-//	  OpPut(k2,v2), OpPut(k3,v3)
-//	 ).Else(
-//	  OpPut(k4,v4), OpPut(k5,v5)
-//	 ).Commit()
-//
+//	Txn(context.TODO()).If(
+//	 Compare(Value(k1), ">", v1),
+//	 Compare(Version(k1), "=", 2)
+//	).Then(
+//	 OpPut(k2,v2), OpPut(k3,v3)
+//	).Else(
+//	 OpPut(k4,v4), OpPut(k5,v5)
+//	).Commit()
 type Txn interface {
 	// If takes a list of comparison. If all comparisons passed in succeed,
 	// the operations passed into Then() will be executed. Or the operations

client/v3/txn_test.go

@@ -23,7 +23,7 @@ import (
 )
 
 func TestTxnPanics(t *testing.T) {
-	testutil.BeforeTest(t)
+	testutil.RegisterLeakDetection(t)
 
 	kv := &kv{}
 

client/v3/utils.go

@@ -16,9 +16,6 @@ package clientv3
 
 import (
 	"math/rand"
-	"reflect"
-	"runtime"
-	"strings"
 	"time"
 )
 
@@ -32,18 +29,3 @@ func jitterUp(duration time.Duration, jitter float64) time.Duration {
 	multiplier := jitter * (rand.Float64()*2 - 1)
 	return time.Duration(float64(duration) * (1 + multiplier))
 }
-
-// Check if the provided function is being called in the op options.
-func isOpFuncCalled(op string, opts []OpOption) bool {
-	for _, opt := range opts {
-		v := reflect.ValueOf(opt)
-		if v.Kind() == reflect.Func {
-			if opFunc := runtime.FuncForPC(v.Pointer()); opFunc != nil {
-				if strings.Contains(opFunc.Name(), op) {
-					return true
-				}
-			}
-		}
-	}
-	return false
-}

client/v3/watch.go

@@ -37,6 +37,13 @@ const (
 	EventTypePut    = mvccpb.PUT
 
 	closeSendErrTimeout = 250 * time.Millisecond
+
+	// AutoWatchID is the watcher ID passed in WatchStream.Watch when no
+	// user-provided ID is available. If pass, an ID will automatically be assigned.
+	AutoWatchID = 0
+
+	// InvalidWatchID represents an invalid watch ID and prevents duplication with an existing watch.
+	InvalidWatchID = -1
 )
 
 type Event mvccpb.Event
@@ -450,7 +457,7 @@ func (w *watcher) closeStream(wgs *watchGrpcStream) {
 
 func (w *watchGrpcStream) addSubstream(resp *pb.WatchResponse, ws *watcherStream) {
 	// check watch ID for backward compatibility (<= v3.3)
-	if resp.WatchId == -1 || (resp.Canceled && resp.CancelReason != "") {
+	if resp.WatchId == InvalidWatchID || (resp.Canceled && resp.CancelReason != "") {
 		w.closeErr = v3rpc.Error(errors.New(resp.CancelReason))
 		// failed; no channel
 		close(ws.recvc)
@@ -481,7 +488,7 @@ func (w *watchGrpcStream) closeSubstream(ws *watcherStream) {
 	} else if ws.outc != nil {
 		close(ws.outc)
 	}
-	if ws.id != -1 {
+	if ws.id != InvalidWatchID {
 		delete(w.substreams, ws.id)
 		return
 	}
@@ -533,6 +540,7 @@ func (w *watchGrpcStream) run() {
 	cancelSet := make(map[int64]struct{})
 
 	var cur *pb.WatchResponse
+	backoff := time.Millisecond
 	for {
 		select {
 		// Watch() requested
@@ -543,7 +551,7 @@ func (w *watchGrpcStream) run() {
 				// TODO: pass custom watch ID?
 				ws := &watcherStream{
 					initReq: *wreq,
-					id:      -1,
+					id:      InvalidWatchID,
 					outc:    outc,
 					// unbuffered so resumes won't cause repeat events
 					recvc: make(chan *WatchResponse),
@@ -649,6 +657,7 @@ func (w *watchGrpcStream) run() {
 				closeErr = err
 				return
 			}
+			backoff = w.backoffIfUnavailable(backoff, err)
 			if wc, closeErr = w.newWatchClient(); closeErr != nil {
 				return
 			}
@@ -669,7 +678,7 @@ func (w *watchGrpcStream) run() {
 			if len(w.substreams)+len(w.resuming) == 0 {
 				return
 			}
-			if ws.id != -1 {
+			if ws.id != InvalidWatchID {
 				// client is closing an established watch; close it on the server proactively instead of waiting
 				// to close when the next message arrives
 				cancelSet[ws.id] = struct{}{}
@@ -716,9 +725,9 @@ func (w *watchGrpcStream) dispatchEvent(pbresp *pb.WatchResponse) bool {
 		cancelReason:    pbresp.CancelReason,
 	}
 
-	// watch IDs are zero indexed, so request notify watch responses are assigned a watch ID of -1 to
+	// watch IDs are zero indexed, so request notify watch responses are assigned a watch ID of InvalidWatchID to
 	// indicate they should be broadcast.
-	if wr.IsProgressNotify() && pbresp.WatchId == -1 {
+	if wr.IsProgressNotify() && pbresp.WatchId == InvalidWatchID {
 		return w.broadcastResponse(wr)
 	}
 
@@ -839,7 +848,7 @@ func (w *watchGrpcStream) serveSubstream(ws *watcherStream, resumec chan struct{
 				}
 			} else {
 				// current progress of watch; <= store revision
-				nextRev = wr.Header.Revision
+				nextRev = wr.Header.Revision + 1
 			}
 
 			if len(wr.Events) > 0 {
@@ -873,7 +882,7 @@ func (w *watchGrpcStream) newWatchClient() (pb.Watch_WatchClient, error) {
 	w.resumec = make(chan struct{})
 	w.joinSubstreams()
 	for _, ws := range w.substreams {
-		ws.id = -1
+		ws.id = InvalidWatchID
 		w.resuming = append(w.resuming, ws)
 	}
 	// strip out nils, if any
@@ -963,6 +972,21 @@ func (w *watchGrpcStream) joinSubstreams() {
 
 var maxBackoff = 100 * time.Millisecond
 
+func (w *watchGrpcStream) backoffIfUnavailable(backoff time.Duration, err error) time.Duration {
+	if isUnavailableErr(w.ctx, err) {
+		// retry, but backoff
+		if backoff < maxBackoff {
+			// 25% backoff factor
+			backoff = backoff + backoff/4
+			if backoff > maxBackoff {
+				backoff = maxBackoff
+			}
+		}
+		time.Sleep(backoff)
+	}
+	return backoff
+}
+
 // openWatchClient retries opening a watch client until success or halt.
 // manually retry in case "ws==nil && err==nil"
 // TODO: remove FailFast=false
@@ -983,17 +1007,7 @@ func (w *watchGrpcStream) openWatchClient() (ws pb.Watch_WatchClient, err error)
 		if isHaltErr(w.ctx, err) {
 			return nil, v3rpc.Error(err)
 		}
-		if isUnavailableErr(w.ctx, err) {
-			// retry, but backoff
-			if backoff < maxBackoff {
-				// 25% backoff factor
-				backoff = backoff + backoff/4
-				if backoff > maxBackoff {
-					backoff = maxBackoff
-				}
-			}
-			time.Sleep(backoff)
-		}
+		backoff = w.backoffIfUnavailable(backoff, err)
 	}
 	return ws, nil
 }

etcd.conf.yml.sample

@@ -125,6 +125,9 @@ peer-transport-security:
   # Peer TLS using generated certificates.
   auto-tls: false
 
+# The validity period of the self-signed certificate, the unit is year.
+self-signed-cert-validity: 1
+
 # Enable debug-level logging for etcd.
 log-level: debug
 

etcdctl/ctlv3/command/defrag_command.go

@@ -46,6 +46,7 @@ func defragCommandFunc(cmd *cobra.Command, args []string) {
 		if err != nil {
 			cobrautl.ExitWithError(cobrautl.ExitError, err)
 		}
+		return
 	}
 
 	failures := 0

etcdctl/ctlv3/command/del_command.go

@@ -16,9 +16,10 @@ package command
 
 import (
 	"fmt"
+	"os"
 
 	"github.com/spf13/cobra"
-	"go.etcd.io/etcd/client/v3"
+	clientv3 "go.etcd.io/etcd/client/v3"
 	"go.etcd.io/etcd/pkg/v3/cobrautl"
 )
 
@@ -26,6 +27,7 @@ var (
 	delPrefix  bool
 	delPrevKV  bool
 	delFromKey bool
+	delRange   bool
 )
 
 // NewDelCommand returns the cobra command for "del".
@@ -39,6 +41,7 @@ func NewDelCommand() *cobra.Command {
 	cmd.Flags().BoolVar(&delPrefix, "prefix", false, "delete keys with matching prefix")
 	cmd.Flags().BoolVar(&delPrevKV, "prev-kv", false, "return deleted key-value pairs")
 	cmd.Flags().BoolVar(&delFromKey, "from-key", false, "delete keys that are greater than or equal to the given key using byte compare")
+	cmd.Flags().BoolVar(&delRange, "range", false, "delete range of keys")
 	return cmd
 }
 
@@ -70,6 +73,9 @@ func getDelOp(args []string) (string, []clientv3.OpOption) {
 			cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("too many arguments, only accept one argument when `--prefix` or `--from-key` is set"))
 		}
 		opts = append(opts, clientv3.WithRange(args[1]))
+		if !delRange {
+			fmt.Fprintln(os.Stderr, "In etcd v3.6, the operation will be suspended for a few seconds to provide the user time to verify range.")
+		}
 	}
 
 	if delPrefix {

etcdctl/ctlv3/command/ep_command.go

@@ -22,6 +22,7 @@ import (
 
 	"go.etcd.io/etcd/api/v3/etcdserverpb"
 	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	"go.etcd.io/etcd/client/pkg/v3/logutil"
 	v3 "go.etcd.io/etcd/client/v3"
 	"go.etcd.io/etcd/pkg/v3/cobrautl"
 	"go.etcd.io/etcd/pkg/v3/flags"
@@ -88,7 +89,7 @@ type epHealth struct {
 
 // epHealthCommandFunc executes the "endpoint-health" command.
 func epHealthCommandFunc(cmd *cobra.Command, args []string) {
-	lg, err := zap.NewProduction()
+	lg, err := logutil.CreateDefaultZapLogger(zap.InfoLevel)
 	if err != nil {
 		cobrautl.ExitWithError(cobrautl.ExitError, err)
 	}

etcdctl/ctlv3/command/global.go

@@ -25,6 +25,7 @@ import (
 	"time"
 
 	"github.com/bgentry/speakeasy"
+	"go.etcd.io/etcd/client/pkg/v3/logutil"
 	"go.etcd.io/etcd/client/pkg/v3/srv"
 	"go.etcd.io/etcd/client/pkg/v3/transport"
 	"go.etcd.io/etcd/client/v3"
@@ -114,7 +115,7 @@ func (*discardValue) Set(string) error { return nil }
 func (*discardValue) Type() string     { return "" }
 
 func clientConfigFromCmd(cmd *cobra.Command) *clientConfig {
-	lg, err := zap.NewProduction()
+	lg, err := logutil.CreateDefaultZapLogger(zap.InfoLevel)
 	if err != nil {
 		cobrautl.ExitWithError(cobrautl.ExitError, err)
 	}
@@ -193,7 +194,7 @@ func newClientCfg(endpoints []string, dialTimeout, keepAliveTime, keepAliveTimeo
 	// set tls if any one tls option set
 	var cfgtls *transport.TLSInfo
 	tlsinfo := transport.TLSInfo{}
-	tlsinfo.Logger, _ = zap.NewProduction()
+	tlsinfo.Logger, _ = logutil.CreateDefaultZapLogger(zap.InfoLevel)
 	if scfg.cert != "" {
 		tlsinfo.CertFile = scfg.cert
 		cfgtls = &tlsinfo