目录
- redigo 对 发布订阅的使用
- 订阅的主题
- 发布
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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