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redis_lock.go
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/
redis_lock.go
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package dorm
import (
"context"
"errors"
"fmt"
"github.com/redis/go-redis/v9"
"time"
)
// RedisClientLock https://github.com/go-redis/redis
type RedisClientLock struct {
operation *RedisClient // 操作
}
// NewLock 实例化锁
func (r *RedisClient) NewLock() *RedisClientLock {
return &RedisClientLock{r}
}
// Lock 上锁
// key 锁名
// val 锁内容
// ttl 锁过期时间
func (rl *RedisClientLock) Lock(ctx context.Context, key string, val string, ttl time.Duration) (resp string, err error) {
if ttl <= 0 {
return resp, errors.New("长期请使用 LockForever 方法")
}
// 获取
get, err := rl.operation.Get(ctx, key).Result()
if errors.Is(err, redis.Nil) {
// 设置
err = rl.operation.Set(ctx, key, val, ttl).Err()
if err != nil {
return resp, errors.New(fmt.Sprintf("上锁失败:%s", err.Error()))
}
return val, nil
}
if get != "" {
return resp, errors.New("上锁失败,已存在")
}
return resp, errors.New(fmt.Sprintf("获取异常:%s", err.Error()))
}
// Unlock 解锁
// key 锁名
func (rl *RedisClientLock) Unlock(ctx context.Context, key string) error {
_, err := rl.operation.Del(ctx, key).Result()
if err != nil {
return errors.New(fmt.Sprintf("解锁失败:%s", err.Error()))
}
return err
}
// LockForever 永远上锁
// key 锁名
// val 锁内容
func (rl *RedisClientLock) LockForever(ctx context.Context, key string, val string) (resp string, err error) {
// 获取
get, err := rl.operation.Get(ctx, key).Result()
if errors.Is(err, redis.Nil) {
// 设置
err = rl.operation.Set(ctx, key, val, 0).Err()
if err != nil {
return resp, errors.New(fmt.Sprintf("上锁失败:%s", err.Error()))
}
return val, nil
}
if get != "" {
return resp, errors.New("上锁失败,已存在")
}
return resp, errors.New(fmt.Sprintf("获取异常:%s", err.Error()))
}