| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package filelock |
| 4 | |
| 5 | import ( |
| 6 | "path/filepath" |
| 7 | |
| 8 | "github.com/gofrs/flock" |
| 9 | ) |
| 10 | |
| 11 | func New(dir string) *Locker { |
| 12 | return &Locker{ |
| 13 | suffix: ".collector.lock", |
| 14 | dir: dir, |
| 15 | locks: make(map[string]*flock.Flock), |
| 16 | } |
| 17 | } |
| 18 | |
| 19 | type Locker struct { |
| 20 | suffix string |
| 21 | dir string |
| 22 | locks map[string]*flock.Flock |
| 23 | } |
| 24 | |
| 25 | func (l *Locker) Lock(name string) (bool, error) { |
| 26 | filename := l.filename(name) |
| 27 | |
| 28 | if _, ok := l.locks[filename]; ok { |
| 29 | return true, nil |
| 30 | } |
| 31 | |
| 32 | locker := flock.New(filename) |
| 33 | |
| 34 | ok, err := locker.TryLock() |
| 35 | if ok { |
| 36 | l.locks[filename] = locker |
| 37 | } else { |
| 38 | _ = locker.Close() |
| 39 | } |
| 40 | |
| 41 | return ok, err |
| 42 | } |
| 43 | |
| 44 | func (l *Locker) Unlock(name string) { |
| 45 | filename := l.filename(name) |
| 46 | |
| 47 | locker, ok := l.locks[filename] |
| 48 | if !ok { |
| 49 | return |
| 50 | } |
| 51 | |
| 52 | delete(l.locks, filename) |
| 53 | |
| 54 | _ = locker.Close() |
| 55 | } |
| 56 | |
| 57 | func (l *Locker) UnlockAll() { |
| 58 | for key, locker := range l.locks { |
| 59 | delete(l.locks, key) |
| 60 | _ = locker.Close() |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | func (l *Locker) isLocked(name string) bool { |
| 65 | _, ok := l.locks[l.filename(name)] |
| 66 | return ok |
| 67 | } |
| 68 | |
| 69 | func (l *Locker) filename(name string) string { |
| 70 | return filepath.Join(l.dir, name+l.suffix) |
| 71 | } |