Go中的Unix套接字 [英] Unix Sockets in Go

问题描述

我试图制作一个简单的echo客户端和使用Unix套接字的服务器。在这个例子中，连接似乎是单向的。服务器可以从客户端接收数据，但不能将数据发回。如果我使用tcp连接，它会很好。有人知道有什么问题吗？
$ b

服务器

I'm trying to make a simple echo client and server that uses Unix sockets. In this example, the connection seems to be unidirectional. The server can receive data from the client, but it can't send the data back. If I use tcp connections instead, it works great. Does anyone know what's wrong?

package main

import "net"
import "fmt"

func echoServer(c net.Conn) {
    for {
        buf := make([]byte, 512)
        nr, err := c.Read(buf)
        if err != nil {
            return
        }

        data := buf[0:nr]
        fmt.Printf("Received: %v", string(data))
        _, err = c.Write(data)
        if err != nil {
            panic("Write: " + err.String())
        }
    }
}

func main() {
    l, err := net.Listen("unix", "/tmp/echo.sock")
    if err != nil {
        println("listen error", err.String())
        return
    }

    for {
        fd, err := l.Accept()
        if err != nil {
            println("accept error", err.String())
            return
        }

        go echoServer(fd)
    }
}

客户

Client

package main

import "net"
import "time"

func main() {
    c,err := net.Dial("unix","", "/tmp/echo.sock")
    if err != nil {
        panic(err.String())
    }
    for {
        _,err := c.Write([]byte("hi\n"))
        if err != nil {
            println(err.String())
        }
        time.Sleep(1e9)
    }
}

推荐答案

在您的示例客户端中，您似乎没有从服务器读取结果。当我添加代码来做到这一点时，我可以看到服务器的结果。

In your example client, you don't seem to be reading the result from the server. When I add code to do that, I see the results from the server.

另外，请看看我如何使用延迟和中断来让阅读器退出。

服务器

Also, take a look at how I used defer and break to make the reader goroutine exit.

package main

import (
    "log"
    "net"
)

func echoServer(c net.Conn) {
    for {
        buf := make([]byte, 512)
        nr, err := c.Read(buf)
        if err != nil {
            return
        }

        data := buf[0:nr]
        println("Server got:", string(data))
        _, err = c.Write(data)
        if err != nil {
            log.Fatal("Write: ", err)
        }
    }
}

func main() {
    l, err := net.Listen("unix", "/tmp/echo.sock")
    if err != nil {
        log.Fatal("listen error:", err)
    }

    for {
        fd, err := l.Accept()
        if err != nil {
            log.Fatal("accept error:", err)
        }

        go echoServer(fd)
    }
}

客户端

Client

package main

import (
    "io"
    "log"
    "net"
    "time"
)

func reader(r io.Reader) {
    buf := make([]byte, 1024)
    for {
        n, err := r.Read(buf[:])
        if err != nil {
            return
        }
        println("Client got:", string(buf[0:n]))
    }
}

func main() {
    c, err := net.Dial("unix", "/tmp/echo.sock")
    if err != nil {
        panic(err)
    }
    defer c.Close()

    go reader(c)
    for {
        _, err := c.Write([]byte("hi"))
        if err != nil {
            log.Fatal("write error:", err)
            break
        }
        time.Sleep(1e9)
    }
}

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