go.etcd.io/etcd@v3.3.27+incompatible/functional/agent/utils.go (about) 1 // Copyright 2018 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package agent 16 17 import ( 18 "net" 19 "net/url" 20 "os" 21 "os/exec" 22 "path/filepath" 23 "strconv" 24 "time" 25 26 "github.com/coreos/etcd/pkg/fileutil" 27 ) 28 29 // TODO: support separate WAL directory 30 func archive(baseDir, etcdLogPath, dataDir string) error { 31 dir := filepath.Join(baseDir, "etcd-failure-archive", time.Now().Format(time.RFC3339)) 32 if existDir(dir) { 33 dir = filepath.Join(baseDir, "etcd-failure-archive", time.Now().Add(time.Second).Format(time.RFC3339)) 34 } 35 if err := fileutil.TouchDirAll(dir); err != nil { 36 return err 37 } 38 39 if err := os.Rename(etcdLogPath, filepath.Join(dir, "etcd.log")); err != nil { 40 if !os.IsNotExist(err) { 41 return err 42 } 43 } 44 if err := os.Rename(dataDir, filepath.Join(dir, filepath.Base(dataDir))); err != nil { 45 if !os.IsNotExist(err) { 46 return err 47 } 48 } 49 50 return nil 51 } 52 53 func existDir(fpath string) bool { 54 st, err := os.Stat(fpath) 55 if err != nil { 56 if os.IsNotExist(err) { 57 return false 58 } 59 } else { 60 return st.IsDir() 61 } 62 return false 63 } 64 65 func getURLAndPort(addr string) (urlAddr *url.URL, port int, err error) { 66 urlAddr, err = url.Parse(addr) 67 if err != nil { 68 return nil, -1, err 69 } 70 var s string 71 _, s, err = net.SplitHostPort(urlAddr.Host) 72 if err != nil { 73 return nil, -1, err 74 } 75 port, err = strconv.Atoi(s) 76 if err != nil { 77 return nil, -1, err 78 } 79 return urlAddr, port, err 80 } 81 82 func stopWithSig(cmd *exec.Cmd, sig os.Signal) error { 83 err := cmd.Process.Signal(sig) 84 if err != nil { 85 return err 86 } 87 88 errc := make(chan error) 89 go func() { 90 _, ew := cmd.Process.Wait() 91 errc <- ew 92 close(errc) 93 }() 94 95 select { 96 case <-time.After(5 * time.Second): 97 cmd.Process.Kill() 98 case e := <-errc: 99 return e 100 } 101 err = <-errc 102 return err 103 } 104 105 func cleanPageCache() error { 106 // https://www.kernel.org/doc/Documentation/sysctl/vm.txt 107 // https://github.com/torvalds/linux/blob/master/fs/drop_caches.c 108 cmd := exec.Command("/bin/sh", "-c", `echo "echo 1 > /proc/sys/vm/drop_caches" | sudo sh`) 109 return cmd.Run() 110 }