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lock.go
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lock.go
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package session
import (
"context"
"errors"
"fmt"
"time"
"github.com/bsm/redislock"
"github.com/redis/go-redis/v9"
)
const (
KeyTemplate = "%s.lock"
)
var ErrAcquireLock = errors.New("could not acquire lock")
type Lock interface {
Acquire(ctx context.Context, duration time.Duration) error
Release(ctx context.Context) error
}
var _ Lock = &RedisLock{}
type RedisLock struct {
locker *redislock.Client
lock *redislock.Lock
key string
}
func NewRedisLock(client redis.Cmdable, key string) *RedisLock {
return &RedisLock{
locker: redislock.New(client),
key: key,
}
}
func (r *RedisLock) Acquire(ctx context.Context, duration time.Duration) error {
lock, err := r.locker.Obtain(ctx, lockKey(r.key), duration, nil)
if errors.Is(err, redislock.ErrNotObtained) {
return ErrAcquireLock
}
if err != nil {
return err
}
r.lock = lock
return nil
}
func (r *RedisLock) Release(ctx context.Context) error {
return r.lock.Release(ctx)
}
var _ Lock = &NoOpLock{}
type NoOpLock struct{}
func NewNoOpLock() *NoOpLock {
return new(NoOpLock)
}
func (n *NoOpLock) Acquire(_ context.Context, _ time.Duration) error {
return nil
}
func (n *NoOpLock) Release(_ context.Context) error {
return nil
}
func lockKey(key string) string {
return fmt.Sprintf(KeyTemplate, key)
}