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flock.go
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flock.go
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package utils
import (
"context"
"errors"
"path/filepath"
"github.com/fluxninja/aperture/v2/pkg/log"
"github.com/gofrs/flock"
)
const lockFilename = ".flock"
var lock *flock.Flock
func newLock(dir string) {
lock = flock.New(filepath.Join(dir, lockFilename))
}
// WriterLock acquires a writer lock on the directory.
func WriterLock(dir string) error {
if lock == nil {
newLock(dir)
}
// Get writer lock
locked, err := lock.TryLockContext(context.Background(), 10)
if err != nil {
return err
}
if !locked {
return errors.New("unable to acquire lock on directory")
}
return nil
}
// ReaderLock acquires a reader lock on the directory.
func ReaderLock(dir string) error {
if lock == nil {
newLock(dir)
}
// Get reader lock
locked, err := lock.TryRLockContext(context.Background(), 10)
if err != nil {
return err
}
if !locked {
return errors.New("unable to acquire lock on directory")
}
return nil
}
// Unlock releases the lock on the directory.
func Unlock(dir string) {
if lock == nil {
newLock(dir)
}
err := lock.Unlock()
if err != nil {
log.Error().Err(err).Msg("unable to release lock on directory")
}
}