go 語言使用 redigo 發佈訂閱

1.簡單的循環訂閱

package main

import (
    "fmt"
    "time"
    "os"
    "strconv"
    "math/rand"
    "github.com/gomodule/redigo/redis"
)

const RMQ string = "mqtest"

func producer() {
    redis_conn, err := redis.Dial("tcp", "127.0.0.1:6379", redis.DialPassword("yaoyao"))
    if err != nil {
        fmt.Println(err)
        return
    }
    
    defer redis_conn.Close()
    
    rand.Seed(time.Now().UnixNano())

    var i = 1

    for {
        _,err = redis_conn.Do("PUBLISH", RMQ, strconv.Itoa(i))
        if(err!=nil) {
            fmt.Println("produce error")
            continue
        }
        fmt.Printf("produce element:%d\n", i)
        time.Sleep(time.Duration(rand.Intn(10))*time.Second)
        i++
    }
}

func consumer() {
    redis_conn, err := redis.Dial("tcp", "127.0.0.1:6379", redis.DialPassword("yaoyao"))
    if err != nil {
        fmt.Println(err)
        return
    }
    
    defer redis_conn.Close()

    rand.Seed(time.Now().UnixNano())

    for {
        ele,err := redis.String(redis_conn.Do("SUBSCRIBE", RMQ))
        if(err != nil) {
            fmt.Println("no msg.sleep now")
            time.Sleep(time.Duration(rand.Intn(10))*time.Second)
        } else {
            fmt.Printf("cosume element:%s\n", ele)
        }
    }
}

func main() {
    list := os.Args
    if(list[1] == "pro") {
        go producer()
    } else if (list[1] == "con") {
        go consumer()
    }
    for {
        time.Sleep(time.Duration(10000)*time.Second)
    }
}

2. 回調函數訂閱

發佈端

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",redis.DialPassword("yaoyao"))
  if err != nil {
      log.Critical("redis dial failed.")
  }
  defer client.Close()

  _, err = client.Do("Publish", "test_chan1", "hell one")
  if err != nil {
    log.Critical("redis Publish failed.")
  }

  _, err = client.Do("Publish", "test_chan2", "hello2")
  if err != nil {
    log.Critical("redis Publish failed.")
  }

  _, err = client.Do("Publish", "test_chan3", "hello3")
  if err != nil {
    log.Critical("redis Publish failed.")
  }
  
  _, err = client.Send( "test_chan1", "hell one one")
  if err != nil {
    log.Critical("redis Publish failed.")
  }

}

訂閱端

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",redis.DialPassword("yaoyao"))
	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{ // 這段代碼的作用就是 阻止線程結束
		time.Sleep(1 * time.Second)
	}
}