fiber/middleware/idempotency/locker.go

53 lines
764 B
Go

package idempotency
import (
"sync"
)
// Locker implements a spinlock for a string key.
type Locker interface {
Lock(key string) error
Unlock(key string) error
}
type MemoryLock struct {
keys map[string]*sync.Mutex
mu sync.Mutex
}
func (l *MemoryLock) Lock(key string) error {
l.mu.Lock()
mu, ok := l.keys[key]
if !ok {
mu = new(sync.Mutex)
l.keys[key] = mu
}
l.mu.Unlock()
mu.Lock()
return nil
}
func (l *MemoryLock) Unlock(key string) error {
l.mu.Lock()
mu, ok := l.keys[key]
l.mu.Unlock()
if !ok {
// This happens if we try to unlock an unknown key
return nil
}
mu.Unlock()
return nil
}
func NewMemoryLock() *MemoryLock {
return &MemoryLock{
keys: make(map[string]*sync.Mutex),
}
}
var _ Locker = (*MemoryLock)(nil)