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// 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 (
"io"
"net"
"net/url"
"os"
"os/exec"
"path/filepath"
"strconv"
"time"
"go.etcd.io/etcd/client/pkg/v3/fileutil"
"go.uber.org/zap"
)
// TODO: support separate WAL directory
func archive(lg *zap.Logger, 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(lg, dir); err != nil {
return err
}
dst := filepath.Join(dir, "etcd.log")
if err := copyFile(etcdLogPath, dst); 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 copyFile(src, dst string) error {
f, err := os.Open(src)
if err != nil {
return err
}
defer f.Close()
w, err := os.Create(dst)
if err != nil {
return err
}
defer w.Close()
if _, err = io.Copy(w, f); err != nil {
return err
}
return w.Sync()
}
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 -s -n`)
return cmd.Run()
}
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