| // 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 |
| } |
