functional-tester/agent: initial commit

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

tools/functional-tester/agent/utils.go

@@ -0,0 +1,110 @@
+// 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 agent
+
+import (
+	"net"
+	"net/url"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/coreos/etcd/pkg/fileutil"
+)
+
+// TODO: support separate WAL directory
+func archive(baseDir, etcdLogPath, dataDir string) error {
+	dir := filepath.Join(baseDir, "etcd-failure-archive", time.Now().Format(time.RFC3339))
+	if existDir(dir) {
+		dir = filepath.Join(baseDir, "etcd-failure-archive", time.Now().Add(time.Second).Format(time.RFC3339))
+	}
+	if err := fileutil.TouchDirAll(dir); err != nil {
+		return err
+	}
+
+	if err := os.Rename(etcdLogPath, filepath.Join(dir, "etcd.log")); err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+	}
+	if err := os.Rename(dataDir, filepath.Join(dir, filepath.Base(dataDir))); err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func existDir(fpath string) bool {
+	st, err := os.Stat(fpath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return false
+		}
+	} else {
+		return st.IsDir()
+	}
+	return false
+}
+
+func getURLAndPort(addr string) (urlAddr *url.URL, port int, err error) {
+	urlAddr, err = url.Parse(addr)
+	if err != nil {
+		return nil, -1, err
+	}
+	var s string
+	_, s, err = net.SplitHostPort(urlAddr.Host)
+	if err != nil {
+		return nil, -1, err
+	}
+	port, err = strconv.Atoi(s)
+	if err != nil {
+		return nil, -1, err
+	}
+	return urlAddr, port, err
+}
+
+func stopWithSig(cmd *exec.Cmd, sig os.Signal) error {
+	err := cmd.Process.Signal(sig)
+	if err != nil {
+		return err
+	}
+
+	errc := make(chan error)
+	go func() {
+		_, ew := cmd.Process.Wait()
+		errc <- ew
+		close(errc)
+	}()
+
+	select {
+	case <-time.After(5 * time.Second):
+		cmd.Process.Kill()
+	case e := <-errc:
+		return e
+	}
+	err = <-errc
+	return err
+}
+
+func cleanPageCache() error {
+	// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
+	// https://github.com/torvalds/linux/blob/master/fs/drop_caches.c
+	cmd := exec.Command("/bin/sh", "-c", `echo "echo 1 > /proc/sys/vm/drop_caches" | sudo sh`)
+	return cmd.Run()
+}