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redis.go
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redis.go
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package lock_ridis
import (
"errors"
"strconv"
"time"
"github.com/go-redis/redis/v8"
"github.com/songzhibin97/gkit/distributed/locker"
"github.com/songzhibin97/gkit/options"
)
var (
ErrLockFailed = errors.New("获取锁失败")
ErrUnLockFailed = errors.New("释放锁失败")
CMDLock = `if redis.call("GET", KEYS[1]) == ARGV[1] then
redis.call("SET", KEYS[1], ARGV[1], "PX", ARGV[2])
return "OK"
else
return redis.call("SET", KEYS[1], ARGV[1], "NX", "PX", ARGV[2])
end`
CMDUnlock = `if redis.call("GET", KEYS[1]) == ARGV[1] then
return redis.call("DEL", KEYS[1])
else
return 0
end`
)
type Lock struct {
config
client redis.UniversalClient
}
func (l *Lock) lock(key string, expire int, mark string) error {
ctx := l.client.Context()
resp, err := l.client.Eval(ctx, CMDLock, []string{key}, []string{mark, strconv.Itoa(expire)}).Result()
if err != nil && !errors.Is(err, redis.Nil) {
return err
}
if errors.Is(err, redis.Nil) || resp == nil {
return ErrLockFailed
}
reply, ok := resp.(string)
if !ok || reply != "OK" {
return ErrUnLockFailed
}
return nil
}
func (l *Lock) Lock(key string, expire int, mark string) error {
var err error
for i := 0; i < l.retries+1; i++ {
err = l.lock(key, expire, mark)
if err == nil {
break
}
if l.interval > 0 {
time.Sleep(l.interval)
}
}
return err
}
func (l *Lock) UnLock(key string, mark string) error {
ctx := l.client.Context()
resp, err := l.client.Eval(ctx, CMDUnlock, []string{key}, []string{mark}).Result()
if err != nil && !errors.Is(err, redis.Nil) {
return err
}
if errors.Is(err, redis.Nil) || resp == nil {
return ErrUnLockFailed
}
reply, ok := resp.(int64)
if !ok || reply != 1 {
return ErrUnLockFailed
}
return nil
}
func NewRedisLock(client redis.UniversalClient, opts ...options.Option) locker.Locker {
o := &config{
interval: 0,
retries: 0,
}
for _, opt := range opts {
opt(o)
}
if o.interval <= 0 || o.retries <= 0 {
o.interval = 0
o.retries = 0
}
return &Lock{
client: client,
config: *o,
}
}