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127 lines
3.2 KiB
127 lines
3.2 KiB
// Copyright 2020 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package disk
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/danjacques/gofslock/fslock"
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"github.com/pingcap/errors"
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"github.com/pingcap/log"
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"github.com/pingcap/parser/terror"
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"github.com/pingcap/tidb/config"
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"go.uber.org/zap"
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"golang.org/x/sync/singleflight"
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)
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var (
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tempDirLock fslock.Handle
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sf singleflight.Group
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)
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const (
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lockFile = "_dir.lock"
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recordDir = "record"
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)
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// CheckAndInitTempDir check whether the temp directory is existed.
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// If not, initializes the temp directory.
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func CheckAndInitTempDir() (err error) {
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_, err, _ = sf.Do("tempDir", func() (value interface{}, err error) {
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if !checkTempDirExist() {
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log.Info("Tmp-storage-path not found. Try to initialize TempDir.")
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err = InitializeTempDir()
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}
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return
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})
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return
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}
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func checkTempDirExist() bool {
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tempDir := config.GetGlobalConfig().TempStoragePath
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_, err := os.Stat(tempDir)
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if err != nil && !os.IsExist(err) {
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return false
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}
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return true
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}
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// InitializeTempDir initializes the temp directory.
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func InitializeTempDir() error {
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tempDir := config.GetGlobalConfig().TempStoragePath
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_, err := os.Stat(tempDir)
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if err != nil && !os.IsExist(err) {
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err = os.MkdirAll(tempDir, 0755)
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if err != nil {
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return err
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}
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}
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tempDirLock, err = fslock.Lock(filepath.Join(tempDir, lockFile))
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if err != nil {
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switch err {
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case fslock.ErrLockHeld:
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log.Error("The current temporary storage dir has been occupied by another instance, "+
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"check tmp-storage-path config and make sure they are different.", zap.String("TempStoragePath", tempDir), zap.Error(err))
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default:
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log.Error("Failed to acquire exclusive lock on the temporary storage dir.", zap.String("TempStoragePath", tempDir), zap.Error(err))
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}
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return err
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}
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subDirs, err := ioutil.ReadDir(tempDir)
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if err != nil {
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return err
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}
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// If it exists others files except lock file, creates another goroutine to clean them.
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if len(subDirs) > 2 {
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go func() {
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for _, subDir := range subDirs {
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// Do not remove the lock file.
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switch subDir.Name() {
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case lockFile, recordDir:
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continue
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}
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err := os.RemoveAll(filepath.Join(tempDir, subDir.Name()))
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if err != nil {
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log.Warn("Remove temporary file error",
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zap.String("tempStorageSubDir", filepath.Join(tempDir, subDir.Name())), zap.Error(err))
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}
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}
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}()
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}
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return nil
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}
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// CleanUp releases the directory lock when exiting TiDB.
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func CleanUp() {
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if tempDirLock != nil {
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err := tempDirLock.Unlock()
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terror.Log(errors.Trace(err))
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}
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}
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// CheckAndCreateDir check whether the directory is existed. If not, then create it.
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func CheckAndCreateDir(path string) error {
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_, err := os.Stat(path)
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if err != nil && !os.IsExist(err) {
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err = os.MkdirAll(path, 0755)
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if err != nil {
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return err
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}
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}
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return nil
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}
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