我正在试着用redis中的pub sub。我要做的是打开两个 redis-cli . 我第一次发出命令 flushall 确保绿色启动。
然后在另一个终端中，我打开监视器以打印来自我的golang示例客户机的所有命令（下面的代码）。
下面是我从监视器上得到的信息：

1590207069.340860 [0 127.0.0.1:58910] "smembers" "user:Ali:rooms"
1590207069.341380 [0 127.0.0.1:58910] "sadd" "user:Ali:rooms" "New"
1590207069.345266 [0 127.0.0.1:58910] "smembers" "user:Ali:rooms"
1590207069.353706 [0 127.0.0.1:58910] "sadd" "user:Ali:rooms" "Old"
1590207069.354219 [0 127.0.0.1:58912] "subscribe" "New"
1590207069.354741 [0 127.0.0.1:58910] "smembers" "user:Ali:rooms"
1590207069.355444 [0 127.0.0.1:58912] "unsubscribe" "New" "Old"
1590207069.356754 [0 127.0.0.1:58910] "sadd" "user:Ali:rooms" "OldPlusPlus"
1590207069.357206 [0 127.0.0.1:58914] "subscribe" "New" "Old"
1590207069.357656 [0 127.0.0.1:58910] "smembers" "user:Ali:rooms"
1590207069.358362 [0 127.0.0.1:58912] "unsubscribe" "OldPlusPlus" "New" "Old"
1590207069.361030 [0 127.0.0.1:58916] "subscribe" "OldPlusPlus" "New" "Old"

我试图使客户机有一个连接的所有频道，是随着时间的推移开放。而不是一个连接/线程来处理redis的每个通道。因此，每当需要新的订阅请求时，我都会尝试从客户机中删除所有以前的订阅，并对旧频道和新频道进行新订阅。
但看起来 unsubscribe 命令没有按预期工作（或者我遗漏了一些东西）！
因为从第一个终端开始，当我尝试获取每个通道的客户端数量时：

127.0.0.1:6379> pubsub numsub OldPlusPlus New Old
1) "OldPlusPlus"
2) (integer) 1
3) "New"
4) (integer) 2
5) "Old"
6) (integer) 2

此外，当我试图发送一条消息到“新”频道，我让我的围棋客户端收到消息两次！。
以下是生成上述命令的代码：

package main

import (
    "fmt"
    "github.com/go-redis/redis/v7"
    "log"
)

type user struct {
    name   string
    rooms  []string
    endSub chan bool
    sub    bool
}

func (u *user) connect(rdb *redis.Client) error {
    // get all user rooms (from DB) and start subscribe
    r, err := rdb.SMembers(fmt.Sprintf("user:%s:rooms", u.name)).Result()
    if err != nil {
        return err
    }
    u.rooms = r

    if len(u.rooms) == 0 {
        return nil
    }

    u.doSubscribe(rdb)

    return nil
}

func (u *user) subscribe(room string, rdb *redis.Client) error {
    // check if already subscribed
    for i := range u.rooms {
        if u.rooms[i] == room {
            return nil
        }
    }

    // add room to user
    userRooms := fmt.Sprintf("user:%s:rooms", u.name)
    if err := rdb.SAdd(userRooms, room).Err(); err != nil {
        return err
    }

    // get all user rooms (from DB) and start subscribe
    r, err := rdb.SMembers(userRooms).Result()
    if err != nil {
        return err
    }
    u.rooms = r

    if u.sub {
        u.endSub <- true
    }

    u.doSubscribe(rdb)

    return nil
}

func (u *user) doSubscribe(rdb *redis.Client) {
    sub := rdb.Subscribe(u.rooms...)
    go func() {
        u.sub = true
        fmt.Println("starting the listener for user:", u.name, "on rooms:", u.rooms)
        for {
            select {

            case msg, ok := <-sub.Channel():
                if !ok {
                    break
                }
                fmt.Println(msg.Payload)

            case <-u.endSub:
                fmt.Println("Stop listening for user:", u.name, "from rooms:", u.rooms)
                if err := sub.Unsubscribe(u.rooms...); err != nil {
                    fmt.Println("error unsubscribing")
                    return
                }
                break
            }
        }
    }()
}

func (u *user) unsubscribe(room string, rdb *redis.Client) error {
    return nil
}

var rdb *redis.Client

func main() {

    rdb = redis.NewClient(&redis.Options{Addr: "localhost:6379"})

    u := &user{
        name:   "Ali",
        endSub: make(chan bool),
    }

    if err := u.connect(rdb); err != nil {
        log.Fatal(err)
    }

    if err := u.subscribe("New", rdb); err != nil {
        log.Fatal(err)
    }

    if err := u.subscribe("Old", rdb); err != nil {
        log.Fatal(err)
    }

    if err := u.subscribe("OldPlusPlus", rdb); err != nil {
        log.Fatal(err)
    }

    select {}
}