golang redigo发布订阅 golang redigo发布订阅使用的方法
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redigo 对 发布订阅的使用
redigo 对redis 的发布订阅机制放在pubsub.go 中
订阅主题后 通过Receive() 函数接受发布订阅主题的消息
// Receive returns a pushed message as a Subscription, Message, Pong or error. // The return value is intended to be used directly in a type switch as // illustrated in the PubSubConn example. func (c PubSubConn) Receive() interface{} { return c.receiveInternal(c.Conn.Receive()) }
返回的是一个空类型的interface{} , 由于空接口没有方法, 因此所有的类型都实现了空接口, 也就是说可以返回任意类型。
具体返回的类型 在receiveInternal() 方法里面可以看到
func (c PubSubConn) receiveInternal(replyArg interface{}, errArg error) interface{} { reply, err := Values(replyArg, errArg) if err != nil { return err } var kind string reply, err = Scan(reply, &kind) if err != nil { return err } switch kind { case "message": var m Message if _, err := Scan(reply, &m.Channel, &m.Data); err != nil { return err } return m case "pmessage": var m Message if _, err := Scan(reply, &m.Pattern, &m.Channel, &m.Data); err != nil { return err } return m case "subscribe", "psubscribe", "unsubscribe", "punsubscribe": s := Subscription{Kind: kind} if _, err := Scan(reply, &s.Channel, &s.Count); err != nil { return err } return s case "pong": var p Pong if _, err := Scan(reply, &p.Data); err != nil { return err } return p } return errors.New("redigo: unknown pubsub notification") }
目前返回 Message Subscription Pone
订阅的主题
收到消息之后通过注册的回调函数处理的方式, 所以代码中多了长map存放回调函数
package main import ( //"github.com/go-redis/redis" "fmt" "github.com/labstack/gommon/log" "github.com/gomodule/redigo/redis" "time" //"reflect" "unsafe" ) type SubscribeCallback func (channel, message string) type Subscriber struct { client redis.PubSubConn cbMap map[string]SubscribeCallback } func (c *Subscriber) Connect(ip string, port uint16) { conn, err := redis.Dial("tcp", "127.0.0.1:6379") if err != nil { log.Error("redis dial failed.") } c.client = redis.PubSubConn{conn} c.cbMap = make(map[string]SubscribeCallback) go func() { for { log.Info("wait...") switch res := c.client.Receive().(type) { case redis.Message: channel := (*string)(unsafe.Pointer(&res.Channel)) message := (*string)(unsafe.Pointer(&res.Data)) c.cbMap[*channel](*channel, *message) case redis.Subscription: fmt.Printf("%s: %s %d\n", res.Channel, res.Kind, res.Count) case error: log.Error("error handle...") continue } } }() } func (c *Subscriber) Close() { err := c.client.Close() if err != nil{ log.Error("redis close error.") } } func (c *Subscriber) Subscribe(channel interface{}, cb SubscribeCallback) { err := c.client.Subscribe(channel) if err != nil{ log.Error("redis Subscribe error.") } c.cbMap[channel.(string)] = cb } func TestCallback1(chann, msg string){ log.Info("TestCallback1 channel : ", chann, " message : ", msg) } func TestCallback2(chann, msg string){ log.Info("TestCallback2 channel : ", chann, " message : ", msg) } func TestCallback3(chann, msg string){ log.Info("TestCallback3 channel : ", chann, " message : ", msg) } func main() { log.Info("===========main start============") var sub Subscriber sub.Connect("127.0.0.1", 6397) sub.Subscribe("test_chan1", TestCallback1) sub.Subscribe("test_chan2", TestCallback2) sub.Subscribe("test_chan3", TestCallback3) for{ // 这段代码的作用就是 阻止线程结束 time.Sleep(1 * time.Second) } }
运行main 文件 然后 看到
在redis 客户端 执行 发布信息
在控制台 看到监控结果 回调函数 执行的结果
发布
上面是订阅的代码和 代码要处理 的回调函数
发布直接使用默认的 Conn来Send Publish 就可以
redigo 的管道使用方法设计到三个函数 Do 函数也是下面这个函数的合并
- c.Send()
- c.Flush()
- c.Receive()
解释:
send() 方法吧命令写到缓冲区, flush() 把缓冲区的命令刷新到redis 服务器 receive() 函数接受redis 给予的 回应, 三个操作共同完成一套命令流程。
代码
package main import( //"github.com/go-redis/redis" "github.com/gomodule/redigo/redis" log "github.com/astaxie/beego/logs" ) func main() { client, err := redis.Dial("tcp", "127.0.0.1:6379") if err != nil { log.Critical("redis dial failed.") } defer client.Close() _, err = client.Do("Publish", "test_chan1", "hello") if err != nil { log.Critical("redis Publish failed.") } _, err = client.Do("Publish", "test_chan2", "hello") if err != nil { log.Critical("redis Publish failed.") } _, err = client.Do("Publish", "test_chan3", "hello") if err != nil { log.Critical("redis Publish failed.") } }
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