root
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
// Copyright 2024 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package globallock
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import (
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"context"
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"sync"
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"sync/atomic"
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"gitea.dev/modules/setting"
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)
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var (
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defaultLocker atomic.Pointer[Locker]
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defaultMutex sync.Mutex
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)
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func initDefaultLocker() Locker {
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switch setting.GlobalLock.ServiceType {
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case "redis":
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return NewRedisLocker(setting.GlobalLock.ServiceConnStr)
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default: // "memory"
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return NewMemoryLocker()
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}
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}
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// DefaultLocker returns the default locker.
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func DefaultLocker() Locker {
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ptr := defaultLocker.Load()
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if ptr == nil {
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defaultMutex.Lock()
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ptr = defaultLocker.Load()
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if ptr == nil {
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ptr = new(initDefaultLocker())
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defaultLocker.Store(ptr)
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}
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defaultMutex.Unlock()
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ptr = defaultLocker.Load()
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}
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return *ptr
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}
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// Lock tries to acquire a lock for the given key, it uses the default locker.
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// Read the documentation of Locker.Lock for more information about the behavior.
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func Lock(ctx context.Context, key string) (ReleaseFunc, error) {
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return DefaultLocker().Lock(ctx, key)
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}
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// TryLock tries to acquire a lock for the given key, it uses the default locker.
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// Read the documentation of Locker.TryLock for more information about the behavior.
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func TryLock(ctx context.Context, key string) (bool, ReleaseFunc, error) {
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return DefaultLocker().TryLock(ctx, key)
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}
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// LockAndDo tries to acquire a lock for the given key and then calls the given function.
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// It uses the default locker, and it will return an error if failed to acquire the lock.
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func LockAndDo(ctx context.Context, key string, f func(context.Context) error) error {
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release, err := Lock(ctx, key)
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if err != nil {
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return err
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}
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defer release()
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return f(ctx)
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}
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// TryLockAndDo tries to acquire a lock for the given key and then calls the given function.
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// It uses the default locker, and it will return false if failed to acquire the lock.
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func TryLockAndDo(ctx context.Context, key string, f func(context.Context) error) (bool, error) {
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ok, release, err := TryLock(ctx, key)
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if err != nil {
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return false, err
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}
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defer release()
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if !ok {
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return false, nil
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}
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return true, f(ctx)
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}
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