etcd-dump-db: initial commit

tools/etcd-dump-db/backend.go

@@ -0,0 +1,83 @@
+// Copyright 2016 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 main
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/boltdb/bolt"
+	"github.com/coreos/etcd/mvcc"
+	"github.com/coreos/etcd/mvcc/backend"
+)
+
+func snapDir(dataDir string) string {
+	return filepath.Join(dataDir, "member", "snap")
+}
+
+func getBuckets(dbPath string) (buckets []string, err error) {
+	db, derr := bolt.Open(dbPath, 0600, &bolt.Options{})
+	if derr != nil {
+		return nil, derr
+	}
+	defer db.Close()
+
+	err = db.View(func(tx *bolt.Tx) error {
+		return tx.ForEach(func(b []byte, _ *bolt.Bucket) error {
+			buckets = append(buckets, string(b))
+			return nil
+		})
+	})
+	return
+}
+
+func iterateBucket(dbPath, bucket string, limit uint64) (err error) {
+	db, derr := bolt.Open(dbPath, 0600, &bolt.Options{})
+	if derr != nil {
+		return derr
+	}
+	defer db.Close()
+
+	err = db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(bucket))
+		if b == nil {
+			return fmt.Errorf("got nil bucket for %s", bucket)
+		}
+
+		c := b.Cursor()
+
+		// iterate in reverse order (use First() and Next() for ascending order)
+		for k, v := c.Last(); k != nil; k, v = c.Prev() {
+			fmt.Printf("key=%q, value=%q\n", k, v)
+
+			limit--
+			if limit == 0 {
+				break
+			}
+		}
+
+		return nil
+	})
+	return
+}
+
+func getHash(dbPath string) (hash uint32, err error) {
+	b := backend.NewDefaultBackend(dbPath)
+	return b.Hash(mvcc.DefaultIgnores)
+}
+
+// TODO: revert by revision and find specified hash value
+// currently, it's hard because lease is in separate bucket
+// and does not modify revision