20年第45周：Go/golang使用redis(go-redis)

习惯研究所所长 · · 661 次点击 · · 开始浏览

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一、话不多说

package main

import (
    "fmt"
    "github.com/go-redis/redis"
    "os"
    "strings"
)

var DbRedis *redis.Client
var RedisPassword string

func getNonBlankStrFromEnv(key string) string {
    v := strings.TrimSpace(os.Getenv(key))
    if len(v) == 0 {
        panic(fmt.Sprintf("missing env[%s]", key))
    }
    return v
}
// 1， 链接数据库
func OpenDbRedis(){
    var err error

    DbRedis = redis.NewClient(
        &redis.Options{
            Addr:     "localhost:6379",
            Password: RedisPassword,
            DB:       0,
        })
    pong,err := DbRedis.Ping().Result()
    if err!=nil {
        fmt.Printf("ping error[%s]\n", err.Error())
        _ = fmt.Errorf(err.Error())
    }
    fmt.Printf("ping result: %s\n", pong) // 期待：PONG

}

func CloseDbRedis(){
    _ = DbRedis.Close()
}

// 2，发布订阅
func Subscribe(channel string) *redis.PubSub {
    var err error
    fmt.Printf("Will subscribe channel [%v]\n", channel)

    pubSub := DbRedis.Subscribe(channel)

    _, err = pubSub.Receive()
    if err != nil {
        fmt.Printf("try subscribe channel[test_channel] error[%s]\n",
            err.Error())
        return nil
    }
    return pubSub
}

func CloseSubscribe(pubSub *redis.PubSub){
    _ = pubSub.Close()
}

func Publish(channel string, msg string) error {
    var err error
    fmt.Printf("Will publish message [%v] to channel [%v]\n", msg, channel)

    err = DbRedis.Publish(channel, msg).Err()
    if err != nil {
        fmt.Printf("try publish message to channel[test_channel] error[%s]\n",
            err.Error())
        return err
    }
    return nil
}

func HandlerSubscribeMessage(pubSub *redis.PubSub) {
    ch := pubSub.Channel()
    for {
        msg, ok := <- ch
        if !ok{
            fmt.Printf("通道接收消息出错!")
            break
        }
        fmt.Printf("Recv message[%v] from channel[%v]\n", msg.Payload, msg.Channel)
    }
}

func main()  {
    RedisPassword = getNonBlankStrFromEnv("DOCKER_REDIS_PASS")

    OpenDbRedis()
    defer CloseDbRedis()

    // 消费消息
    // 1.1, 订阅 sanhuoRedis
    sanhuoSub := Subscribe("sanhuoRedis")
    defer CloseSubscribe(sanhuoSub)
    // 1.2, 订阅 消息接收处理
    go HandlerSubscribeMessage(sanhuoSub)

    // 生产消息
    // 2.1 发布 toSanhuoRedis
    toSanhuoReids := "toSanhuoRedis"
    // 2.2 发布 消息 从命令行读入消息
    var msg string
    for{
        _, _ = fmt.Scanln(&msg)
        _ = Publish(toSanhuoReids, msg)
    }

}