How do I configure logging in Golang?

How do I configure logging in Golang?

To configure logging in Golang, you can use the built-in log package. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

package main

import (
    "log"
    "os"
)

func main() {
    // Create a log file
    file, err := os.OpenFile("app.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
    if err != nil {
        log.Fatal(err)
    }
    // Set log output to the file
    log.SetOutput(file)
    log.Println("This is a log message")
}

This will log messages to a file named app.log. Do you need more details?

What if I want to log at different levels like info, warning, and error?

You can create a custom logger for different levels. Here's an example:

package main

import (
    "log"
    "os"
)

func main() {
    file, err := os.OpenFile("app.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
    if err != nil {
        log.Fatal(err)
    }
    logger := log.New(file, "INFO: ", log.Ldate|log.Ltime)
    logger.Println("This is an info message")
    // For warnings and errors, you can create separate loggers
}

This way, you can customize your logging as needed.