如何在 golang 中使用 gin-gonic 服务器编写流 API?试过 c.Stream 没用 [英] How to write a stream API using gin-gonic server in golang? Tried c.Stream didnt work

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问题描述

我想在 golang 中使用 gin-gonic 服务器创建一个流 API.

I wanted to create one streaming API using gin-gonic server in golang.

func StreamData(c *gin.Context) {
    chanStream := make(chan int, 10)
    go func() {for i := 0; i < 5; i++ {
        chanStream <- i
        time.Sleep(time.Second * 1)
    }}()
    c.Stream(func(w io.Writer) bool {
        c.SSEvent("message", <-chanStream)
        return true
    })
}

router.GET("/stream", controller.StreamData)

但是当我试图到达终点时,它只是卡住了,没有响应.是否有人使用了流功能,以便他/她可以指出我可能正在做的错误.谢谢!

But when I am trying to hit the endpoint, it just stucks and no response comes. Has someone used the stream function so that he/she can point the mistake which I might be doing. Thanks!

推荐答案

如果流结束,您应该返回 false.并关闭 chan.

You should return false if the stream ended. And close the chan.

package main

import (
    "io"
    "time"

    "github.com/gin-gonic/contrib/static"
    "github.com/gin-gonic/gin"
    "github.com/mattn/go-colorable"
)

func main() {
    gin.DefaultWriter = colorable.NewColorableStderr()
    r := gin.Default()
    r.GET("/stream", func(c *gin.Context) {
        chanStream := make(chan int, 10)
        go func() {
            defer close(chanStream)
            for i := 0; i < 5; i++ {
                chanStream <- i
                time.Sleep(time.Second * 1)
            }
        }()
        c.Stream(func(w io.Writer) bool {
            if msg, ok := <-chanStream; ok {
                c.SSEvent("message", msg)
                return true
            }
            return false
        })
    })
    r.Use(static.Serve("/", static.LocalFile("./public", true)))
    r.Run()
}

附加

客户端代码应该是:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
var stream = new EventSource("/stream");
stream.addEventListener("message", function(e){
    console.log(e.data);
});
</script>    
</body>
</html>

这篇关于如何在 golang 中使用 gin-gonic 服务器编写流 API?试过 c.Stream 没用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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