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// Copyright 2015 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 fileutil
import (
"os"
"path/filepath"
"sort"
"strings"
"time"
"go.uber.org/zap"
)
func PurgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) <-chan error {
return purgeFile(lg, dirname, suffix, max, interval, stop, nil, nil)
}
func PurgeFileWithDoneNotify(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) (<-chan struct{}, <-chan error) {
doneC := make(chan struct{})
errC := purgeFile(lg, dirname, suffix, max, interval, stop, nil, doneC)
return doneC, errC
}
// purgeFile is the internal implementation for PurgeFile which can post purged files to purgec if non-nil.
// if donec is non-nil, the function closes it to notify its exit.
func purgeFile(lg *zap.Logger, dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}, purgec chan<- string, donec chan<- struct{}) <-chan error {
if lg == nil {
lg = zap.NewNop()
}
errC := make(chan error, 1)
go func() {
if donec != nil {
defer close(donec)
}
for {
fnames, err := ReadDir(dirname)
if err != nil {
errC <- err
return
}
newfnames := make([]string, 0)
for _, fname := range fnames {
if strings.HasSuffix(fname, suffix) {
newfnames = append(newfnames, fname)
}
}
sort.Strings(newfnames)
fnames = newfnames
for len(newfnames) > int(max) {
f := filepath.Join(dirname, newfnames[0])
l, err := TryLockFile(f, os.O_WRONLY, PrivateFileMode)
if err != nil {
break
}
if err = os.Remove(f); err != nil {
errC <- err
return
}
if err = l.Close(); err != nil {
lg.Warn("failed to unlock/close", zap.String("path", l.Name()), zap.Error(err))
errC <- err
return
}
lg.Info("purged", zap.String("path", f))
newfnames = newfnames[1:]
}
if purgec != nil {
for i := 0; i < len(fnames)-len(newfnames); i++ {
purgec <- fnames[i]
}
}
select {
case <-time.After(interval):
case <-stop:
return
}
}
}()
return errC
}
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