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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package globallock
import (
"context"
"sync"
"code.gitea.io/gitea/modules/setting"
)
var (
defaultLocker Locker
initOnce sync.Once
initFunc = func() {
switch setting.GlobalLock.ServiceType {
case "redis":
defaultLocker = NewRedisLocker(setting.GlobalLock.ServiceConnStr)
case "memory":
fallthrough
default:
defaultLocker = NewMemoryLocker()
}
} // define initFunc as a variable to make it possible to change it in tests
)
// DefaultLocker returns the default locker.
func DefaultLocker() Locker {
initOnce.Do(func() {
initFunc()
})
return defaultLocker
}
// Lock tries to acquire a lock for the given key, it uses the default locker.
// Read the documentation of Locker.Lock for more information about the behavior.
func Lock(ctx context.Context, key string) (ReleaseFunc, error) {
return DefaultLocker().Lock(ctx, key)
}
// TryLock tries to acquire a lock for the given key, it uses the default locker.
// Read the documentation of Locker.TryLock for more information about the behavior.
func TryLock(ctx context.Context, key string) (bool, ReleaseFunc, error) {
return DefaultLocker().TryLock(ctx, key)
}
// LockAndDo tries to acquire a lock for the given key and then calls the given function.
// It uses the default locker, and it will return an error if failed to acquire the lock.
func LockAndDo(ctx context.Context, key string, f func(context.Context) error) error {
release, err := Lock(ctx, key)
if err != nil {
return err
}
defer release()
return f(ctx)
}
// TryLockAndDo tries to acquire a lock for the given key and then calls the given function.
// It uses the default locker, and it will return false if failed to acquire the lock.
func TryLockAndDo(ctx context.Context, key string, f func(context.Context) error) (bool, error) {
ok, release, err := TryLock(ctx, key)
if err != nil {
return false, err
}
defer release()
if !ok {
return false, nil
}
return true, f(ctx)
}
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