How to distinguish between debug mode and normal operation mode when Go program is running?

Detailed explanation of the difference between Go program operation mode: debug mode and normal mode

Many Go developers want programs to perform different logics based on the running mode (debug or normal), such as outputting more detailed logs or performing stricter error checks in debug mode, while remaining simple and efficient in normal mode. This article will introduce how to effectively distinguish the operating mode of Go programs.

First, check if the Go Web framework you are using is built-in debug mode switch. Popular frameworks such as Beego and Gin usually provide convenient debug mode switching mechanisms. Please refer to their documentation for specific methods.

If the framework is not adopted or the framework does not provide debug mode control, you can use the Go standard library os.Getenv function to determine environment variables. This method is simple and direct, and you can make judgments in the program by setting specific environment variables.

The following code snippet demonstrates how to use os.Getenv to determine whether the environment variable DEBUG exists, thereby distinguishing between debugging and normal mode:

 package main

import (
    "fmt"
    "os"
)

func main() {
    if os.Getenv("DEBUG") != "" {
        fmt.Println("Debug mode enabled") // Debug mode logic // ... Add code in debug mode...
    } else {
        fmt.Println("Normal Mode Running") // Normal Mode Logic // ... Add code in normal mode...
    }
}

When running the program, control the running mode by setting the environment variable DEBUG :

 # Normal mode go run main.go

# Debug mode (the value of DEBUG can be any non-empty string)
DEBUG=1 go run main.go

Setting DEBUG to any non-null value will enable debug mode; otherwise, the program will run in normal mode. This method is flexible and suitable for various Go programs, and can switch running mode without modifying the code. Remember to replace println with fmt.Println to comply with Go's standard output method.

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