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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package globallock
import (
"context"
"sync"
"time"
)
type memoryLocker struct {
locks sync.Map
}
var _ Locker = &memoryLocker{}
func NewMemoryLocker() Locker {
return &memoryLocker{}
}
func (l *memoryLocker) Lock(ctx context.Context, key string) (ReleaseFunc, error) {
if l.tryLock(key) {
releaseOnce := sync.Once{}
return func() {
releaseOnce.Do(func() {
l.locks.Delete(key)
})
}, nil
}
ticker := time.NewTicker(time.Millisecond * 100)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return func() {}, ctx.Err()
case <-ticker.C:
if l.tryLock(key) {
releaseOnce := sync.Once{}
return func() {
releaseOnce.Do(func() {
l.locks.Delete(key)
})
}, nil
}
}
}
}
func (l *memoryLocker) TryLock(_ context.Context, key string) (bool, ReleaseFunc, error) {
if l.tryLock(key) {
releaseOnce := sync.Once{}
return true, func() {
releaseOnce.Do(func() {
l.locks.Delete(key)
})
}, nil
}
return false, func() {}, nil
}
func (l *memoryLocker) tryLock(key string) bool {
_, loaded := l.locks.LoadOrStore(key, struct{}{})
return !loaded
}
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