扣减库存使用lua脚本，保证锁存在时才可以操作。主程序对返回数据做校验，对错误任务进行重试。

engine/firstengine.go

@@ -26,9 +26,12 @@ func (e *FirstEngine) CreateWorker(in chan Request, out chan Response) {
 			req := <-in
 			work, err := e.Work(req)
 			if err != nil {
-				log.Printf("work err: %v", err)
+				log.Printf("work:%v err: %v", req, err)
+				//出错之后让其他线程重新调度
+				e.Scheduler.Submit(req)
+			} else {
+				out <- work
 			}
-			out <- work
 		}
 	}()
 }

main.go

@@ -23,7 +23,7 @@ func main() {
 
 	e := engine.FirstEngine{
 		Scheduler: &scheduler.FirstScheduler{},
-		WorkCount: 15,
+		WorkCount: 5,
 		Work:      client.CreateRpcWorker(createRpcPoll(*host)),
 	}
 

redisLock/redis.go

@@ -87,7 +87,7 @@ func (r *RedisLock) autoReNewExpire() {
 		<-r.lockKeepAliveCh
 	}()
 
-	log.Printf("auto renew start: %s,%s,%d\n", r.kvt.key, r.kvt.value, r.kvt.ttl)
+	//log.Printf("auto renew start: %s,%s,%d\n", r.kvt.key, r.kvt.value, r.kvt.ttl)
 
 	tc := time.NewTicker(time.Duration(r.kvt.ttl) * time.Millisecond / 5)
 	defer tc.Stop()

worker/rpc.go

@@ -3,7 +3,6 @@ package worker
 import (
 	"context"
 	"errors"
-	"fmt"
 	"goRedisDLM/engine"
 	"goRedisDLM/redisLock"
 	"log"
@@ -22,14 +21,16 @@ type Inventory struct {
 func (i *Inventory) Work(request engine.Request, response *engine.Response) error {
 	value := uuid.New()
 
-	log.Printf("uuid: %s, lock key: %s\n", value.String(), request.Dlock)
+	//log.Printf("uuid: %s, lock key: %s\n", value.String(), request.Dlock)
 
-	lock := redisLock.CreateRedisLock(i.Client, context.Background(), request.Dlock, value.String(), 300)
+	ctx := context.Background()
+
+	lock := redisLock.CreateRedisLock(i.Client, ctx, request.Dlock, value.String(), 100)
 	lock.Lock()
 
 	time.Sleep(time.Duration(rand.Int31n(100)) * time.Millisecond)
 
-	get := i.Client.Get(context.Background(), "inventory")
+	get := i.Client.Get(ctx, "inventory")
 	log.Printf("%s\n", get)
 
 	inventory, err := strconv.Atoi(get.Val())
@@ -38,7 +39,20 @@ func (i *Inventory) Work(request engine.Request, response *engine.Response) erro
 	}
 	inventory = inventory - 1
 	if inventory >= 0 {
-		i.Client.Set(context.Background(), "inventory", fmt.Sprintf("%d", inventory), redis.KeepTTL)
+		//这里应该使用lua脚本，再检测一下当前是否获取到锁，获取到之后再进行扣减。类似双检加锁的思想，因为此时可能会续期失败。
+		//i.Client.Set(ctx, "inventory", fmt.Sprintf("%d", inventory), redis.KeepTTL)
+		script := `if redis.call('hexists',KEYS[1],ARGV[1]) == 1 then return redis.call('set',KEYS[2],ARGV[2])
+					else return 0 end`
+
+		val := i.Client.Eval(ctx, script, []string{request.Dlock, "inventory"}, value.String(), inventory).Val()
+		if res, ok := val.(string); ok && res == "OK" {
+
+		} else {
+			//任务执行失败需要通知调用者，让调用者自己决策是否需要重新调度还是放弃，这样worker和主线程实现了解偶
+			log.Println("error set inventory")
+			err = errors.New("inventory err")
+			goto Error
+		}
 	} else {
 		log.Printf("error DLock error :%d\n", inventory)
 		err = errors.New("inventory err")