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purge.go
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purge.go
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// Copyright 2015 CoreOS, Inc.
//
// 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"
"sort"
"strings"
"time"
)
func PurgeFile(dirname string, suffix string, max uint, interval time.Duration, stop <-chan struct{}) <-chan error {
errC := make(chan error, 1)
go func() {
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)
for len(newfnames) > int(max) {
f := path.Join(dirname, newfnames[0])
l, err := NewLock(f)
if err != nil {
errC <- err
return
}
err = l.TryLock()
if err != nil {
break
}
err = os.Remove(f)
if err != nil {
errC <- err
return
}
err = l.Unlock()
if err != nil {
plog.Errorf("error unlocking %s when purging file (%v)", l.Name(), err)
errC <- err
return
}
err = l.Destroy()
if err != nil {
plog.Errorf("error destroying lock %s when purging file (%v)", l.Name(), err)
errC <- err
return
}
plog.Infof("purged file %s successfully", f)
newfnames = newfnames[1:]
}
select {
case <-time.After(interval):
case <-stop:
return
}
}
}()
return errC
}