在Go應(yīng)用中處理SIGINT和SIGTERM信號以實(shí)現(xiàn)優(yōu)雅關(guān)閉的方法如下：1. 使用signal.Notify監(jiān)聽指定信號並用緩衝通道接收；2. 將服務(wù)（如HTTP服務(wù)器）啟動在goroutine中以便主協(xié)程等待信號；3. 收到信號後調(diào)用服務(wù)的Shutdown方法進(jìn)行關(guān)閉；4. 執(zhí)行清理邏輯，如關(guān)閉數(shù)據(jù)庫連接、刷新日誌等。具體實(shí)現(xiàn)包括導(dǎo)入os/signal和syscall包，創(chuàng)建通道註冊信號，啟動服務(wù)器並等待信號觸發(fā)關(guān)閉，最後執(zhí)行清理函數(shù)確保資源釋放。

Handling signals like SIGINT and SIGTERM in a Go application is essential if you want your program to shut down gracefully. Whether you're running a web server, background worker, or CLI tool, catching these signals lets you clean up resources, close connections, or save state before exiting.

Here's how to do it effectively without overcomplicating things.

Listen for Signals with signal.Notify

Go provides the os/signal package to handle Unix signals. The most common approach is using signal.Notify to register which signals you want to catch. This function doesn't block, so you usually pair it with a channel to wait for the signal.

 package main

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

func main() {
    sigChan := make(chan os.Signal, 1)
    signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

    fmt.Println("Waiting for signal...")
    receivedSignal := <-sigChan
    fmt.Printf("Got signal: %v\n", receivedSignal)
}

This example will print the signal name when either SIGINT (Ctrl C) or SIGTERM is received.

• Use a buffered channel of size 1 to avoid missing signals.
• Always specify the exact list of signals you want to handle.

Gracefully Shutdown Services

If your app runs a service like an HTTP server, database connection pool, or background workers, you'll want to stop them cleanly after receiving a signal.

For example, when using http.Server , you can call Shutdown() inside your signal handler:

 srv := &http.Server{Addr: ":8080"}

// Start the server in a goroutine
go func() {
    if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
        fmt.Printf("HTTP server error: %v\n", err)
    }
}()

<-sigChan // Wait for signal

fmt.Println("Shutting down server...")
if err := srv.Shutdown(context.Background()); err != nil {
    fmt.Printf("Server shutdown error: %v\n", err)
}

Key points:

• Run the server in a goroutine so the main thread can wait on the signal.
• Always use a context with timeout in real-world cases to prevent hanging.
• Check for http.ErrServerClosed since that's expected during shutdown.

Don't Forget Cleanup Logic

Beyond stopping servers, you might need to flush logs, close file handles, or notify other systems that your process is shutting down.

You can structure this cleanup as a separate function:

 func cleanup() {
    fmt.Println("Cleaning up resources...")
    // Close DB connections, flush logs, etc.
}

Then call it after receiving the signal:

 receivedSignal := <-sigChan
fmt.Printf("Received: %v\n", receivedSignal)
cleanup()

This keeps your signal handling logic clean and focused.

Also consider:

• Using defer for simple cleanup tasks if they don't require waiting for signals.
• Making sure cleanup functions are idempotent — they should be safe to call multiple times.

Handling signals in Go isn't complicated, but getting it right matters for production readiness. With signal.Notify , graceful shutdowns, and proper cleanup, your apps can exit safely when told to stop.

基本上就這些.

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