113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
// Copyright 2015 The etcd Authors
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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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 fileutil
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import (
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"os"
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"path/filepath"
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"sort"
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"strings"
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"time"
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"go.uber.org/zap"
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)
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func PurgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) <-chan error {
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return purgeFile(lg, dirname, suffix, max, interval, stop, nil, nil, true)
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}
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func PurgeFileWithDoneNotify(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) (<-chan struct{}, <-chan error) {
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doneC := make(chan struct{})
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errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC, true)
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return doneC, errC
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}
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func PurgeFileWithoutFlock(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) (<-chan struct{}, <-chan error) {
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doneC := make(chan struct{})
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errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC, false)
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return doneC, errC
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}
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// purgeFile is the internal implementation for PurgeFile which can post purged files to purgec if non-nil.
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// if donec is non-nil, the function closes it to notify its exit.
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func purgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}, purgec chan<- string, donec chan<- struct{}, flock bool) <-chan error {
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if lg == nil {
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lg = zap.NewNop()
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}
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errC := make(chan error, 1)
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lg.Info("started to purge file",
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zap.String("dir", dirname),
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zap.String("suffix", suffix),
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zap.Uint("max", max),
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zap.Duration("interval", interval))
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go func() {
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if donec != nil {
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defer close(donec)
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}
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for {
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fnames, err := ReadDir(dirname)
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if err != nil {
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errC <- err
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return
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}
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newfnames := make([]string, 0)
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for _, fname := range fnames {
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if strings.HasSuffix(fname, suffix) {
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newfnames = append(newfnames, fname)
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}
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}
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sort.Strings(newfnames)
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fnames = newfnames
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for len(newfnames) > int(max) {
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f := filepath.Join(dirname, newfnames[0])
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var l *LockedFile
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if flock {
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l, err = TryLockFile(f, os.O_WRONLY, PrivateFileMode)
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if err != nil {
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lg.Warn("failed to lock file", zap.String("path", f), zap.Error(err))
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break
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}
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}
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if err = os.Remove(f); err != nil {
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lg.Error("failed to remove file", zap.String("path", f), zap.Error(err))
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errC <- err
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return
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}
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if flock {
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if err = l.Close(); err != nil {
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lg.Error("failed to unlock/close", zap.String("path", l.Name()), zap.Error(err))
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errC <- err
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return
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}
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}
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lg.Info("purged", zap.String("path", f))
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newfnames = newfnames[1:]
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}
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if purgec != nil {
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for i := 0; i < len(fnames)-len(newfnames); i++ {
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purgec <- fnames[i]
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}
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}
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select {
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case <-time.After(interval):
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case <-stop:
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return
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}
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}
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}()
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return errC
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}
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