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| package redis
import (
"context"
"fmt"
"math/rand"
"sync"
"time"
"github.com/go-kratos/kratos/v2/log"
"github.com/go-redis/redis/v8"
)
const (
_LockDistributedLua = "local v;" +
"v = redis.call('setnx',KEYS[1],ARGV[1]);" +
"if tonumber(v) == 1 then\n" +
" redis.call('expire',KEYS[1],ARGV[2])\n" +
"end\n" +
"return v"
_UnLockDistributedLua = "if redis.call('get',KEYS[1]) == ARGV[1]\n" +
"then\n" +
" return redis.call('del',KEYS[1])\n" +
"else\n" +
" return 0\n" +
"end"
_DistributedTimeOut = 4
_DistributedSuccess = 1
)
var (
_LockDistributedLuaScript = redis.NewScript(_LockDistributedLua)
_UnLockDistributedLuaScript = redis.NewScript(_UnLockDistributedLua)
)
type Option struct {
Addrs []string
Pwd string
DB int
DialTimeout time.Duration
WriteTimeout time.Duration
ReadTimeout time.Duration
}
type Redis struct {
cluster *redis.ClusterClient
single *redis.Client
clusterMode bool
mutex *sync.Mutex
}
func NewRedis(c *Option) *Redis {
log := log.NewHelper(log.DefaultLogger)
if len(c.Addrs) == 0 {
return nil
}
r := &Redis{}
r.log = log
if len(c.Addrs) == 1 {
r.single = redis.NewClient(
&redis.Options{
Addr: c.Addrs[0],
Password: c.Pwd,
DB: c.DB,
DialTimeout: c.DialTimeout,
ReadTimeout: c.ReadTimeout,
WriteTimeout: c.WriteTimeout,
})
if err := r.single.Ping(context.Background()).Err(); err != nil {
r.log.Errorf(err.Error())
return nil
}
r.single.Do(context.Background(), "CONFIG", "SET", "notify-keyspace-events", "AKE")
r.clusterMode = false
r.mutex = new(sync.Mutex)
return r
}
r.cluster = redis.NewClusterClient(
&redis.ClusterOptions{
Addrs: c.Addrs,
Password: c.Pwd,
DialTimeout: c.DialTimeout,
ReadTimeout: c.ReadTimeout,
WriteTimeout: c.WriteTimeout,
})
if err := r.cluster.Ping(context.Background()).Err(); err != nil {
r.log.Errorf("cluster init failed, error : ", err.Error())
}
r.cluster.Do(context.Background(), "CONFIG", "SET", "notify-keyspace-events", "AKE")
r.clusterMode = true
return r
}
func (r *Redis) Run(ctx context.Context, script *redis.Script, keys []string, argv ...interface{}) interface{} {
r.mutex.Lock()
defer r.mutex.Unlock()
if r.clusterMode {
return script.Run(ctx, r.cluster, keys, argv...).Val()
}
return script.Run(ctx, r.single, keys, argv...).Val()
}
func (r *Redis) TryGetDistributedLock(ctx context.Context, key string) bool {
var res interface{}
if r.clusterMode {
res = _LockDistributedLuaScript.Run(ctx, r.cluster, []string{key}, "_", _DistributedTimeOut).Val()
} else {
res = _LockDistributedLuaScript.Run(ctx, r.single, []string{key}, "_", _DistributedTimeOut).Val()
}
return res.(int64) == _DistributedSuccess
}
func (r *Redis) TryGetDistributedLockWithTimeOut(ctx context.Context, key string, duration time.Duration) bool {
end := duration.Milliseconds()
for getNowMillisecond() <= end {
suc := r.TryGetDistributedLock(ctx, key)
if suc {
return true
}
sleepMillisecond(80 + int64(rand.Int31n(30)))
}
return false
}
func (r *Redis) ReleaseDistributedLock(ctx context.Context, key string) bool {
r.mutex.Lock()
defer r.mutex.Unlock()
var res interface{}
if r.clusterMode {
res = _UnLockDistributedLuaScript.Run(ctx, r.cluster, []string{key}, "_").Val()
} else {
res = _UnLockDistributedLuaScript.Run(ctx, r.single, []string{key}, "_").Val()
}
if res.(int64) == _DistributedSuccess {
return true
}
return false
}
|