11

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

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)

但是当我试图达到终点时,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!

4

1 回答 1

16

如果流结束,您应该返回 false。并关闭陈。

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()
}

额外的

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>
于 2017-06-29T14:56:37.573 回答