使用全局变量在不同进程间共享资源：Go语言的替代方案

package main

import (
    "fmt"
    "log"
    "net"
    "os"
    "os/signal"
    "syscall"
)

const socketPath = "/tmp/logger.sock"

var logger *log.Logger
var logFile *os.File

func main() {
    // 初始化日志记录器
    file, err := os.OpenFile("app.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
    if err != nil {
        log.Fatal(err)
    }
    logFile = file
    logger = log.New(logFile, "APP: ", log.LstdFlags)

    // 创建Unix Socket监听器
    listener, err := net.Listen("unix", socketPath)
    if err != nil {
        log.Fatal("listen error:", err)
    }
    defer listener.Close()

    // 处理信号，优雅关闭
    signalChan := make(chan os.Signal, 1)
    signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)

    go func() {
        sig := <-signalChan
        fmt.Println("Received signal:", sig)
        logFile.Close()
        os.Remove(socketPath)
        os.Exit(0)
    }()

    fmt.Println("Server listening on", socketPath)

    for {
        conn, err := listener.Accept()
        if err != nil {
            log.Println("accept error:", err)
            continue
        }
        go handleConnection(conn)
    }
}

func handleConnection(conn net.Conn) {
    defer conn.Close()

    // 简单示例：客户端发送消息，服务器记录日志
    buf := make([]byte, 1024)
    n, err := conn.Read(buf)
    if err != nil {
        log.Println("read error:", err)
        return
    }

    message := string(buf[:n])
    logger.Println("Received from client:", message)
    conn.Write([]byte("Log recorded"))
}

package main

import (
    "fmt"
    "log"
    "net"
    "os"
)

const socketPath = "/tmp/logger.sock"

func main() {
    conn, err := net.Dial("unix", socketPath)
    if err != nil {
        log.Fatal("dial error:", err)
    }
    defer conn.Close()

    message := "Hello from client!"
    _, err = conn.Write([]byte(message))
    if err != nil {
        log.Fatal("write error:", err)
    }

    buf := make([]byte, 1024)
    n, err := conn.Read(buf)
    if err != nil {
        log.Fatal("read error:", err)
    }

    fmt.Println("Server response:", string(buf[:n]))
    os.Exit(0)
}