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app/service/main/videoup/dao/databus/redis.go

@@ -0,0 +1,86 @@
+package databus
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"go-common/app/service/main/videoup/model/message"
+	"go-common/library/cache/redis"
+	"go-common/library/log"
+)
+
+const (
+	_prefixMsgInfo = "videoup_service_msg"
+	_preLock       = "lock_"
+)
+
+func lockKey(key string) string {
+	return fmt.Sprintf("%s%s", _preLock, key)
+}
+
+// PopMsgCache get databus message from redis
+func (d *Dao) PopMsgCache(c context.Context) (msg *message.Videoup, err error) {
+	var (
+		conn = d.redis.Get(c)
+		bs   []byte
+	)
+	defer conn.Close()
+	if bs, err = redis.Bytes(conn.Do("LPOP", _prefixMsgInfo)); err != nil {
+		if err == redis.ErrNil {
+			err = nil
+		} else {
+			log.Error("conn.Do(LPOP, %s) error(%v)", _prefixMsgInfo, err)
+		}
+		return
+	}
+	msg = &message.Videoup{}
+	if err = json.Unmarshal(bs, msg); err != nil {
+		log.Error("json.Unmarshal error(%v)", err)
+	}
+	return
+}
+
+// PushMsgCache add message into redis.
+func (d *Dao) PushMsgCache(c context.Context, msg *message.Videoup) (err error) {
+	var (
+		bs   []byte
+		conn = d.redis.Get(c)
+	)
+	defer conn.Close()
+	if bs, err = json.Marshal(msg); err != nil {
+		log.Error("json.Marshal(%s) error(%v)", bs, err)
+		return
+	}
+	if _, err = conn.Do("RPUSH", _prefixMsgInfo, bs); err != nil {
+		log.Error("conn.Do(RPUSH, %s) error(%v)", bs, err)
+	}
+	return
+}
+
+//Lock .
+func (d *Dao) Lock(ctx context.Context, key string, ttl int) (gotLock bool, err error) {
+	var lockValue = "1"
+	conn := d.redis.Get(ctx)
+	defer conn.Close()
+	realKey := lockKey(key)
+	var res interface{}
+	//ttl 毫秒(PX)  NX 其实就是 SetNX功能
+	res, err = conn.Do("SET", realKey, lockValue, "PX", ttl, "NX")
+	if err != nil {
+		log.Error("redis_lock failed:%s:%s", realKey, err.Error())
+		return
+	}
+	if res != nil {
+		gotLock = true
+	}
+	return
+}
+
+//UnLock .
+func (d *Dao) UnLock(ctx context.Context, key string) (err error) {
+	realKey := lockKey(key)
+	conn := d.redis.Get(ctx)
+	defer conn.Close()
+	_, err = conn.Do("DEL", realKey)
+	return
+}