How can I format logs in Go?

How can I format logs in Go?

In Go, you can use the log package to format logs. You can set flags for the log output, like log.Ldate, log.Ltime, etc.

Can you show me an example of using the log package?

Sure! Here's a simple example:

package main

import (
    "log"
    "os"
)

func main() {
    logFile, err := os.OpenFile("app.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
    if err != nil {
        log.Fatal(err)
    }
    log.SetOutput(logFile)
    log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
    log.Println("This is a log message")
}

What do the flags log.Ldate and log.Ltime do?

The log.Ldate flag adds the date to the log output, and log.Ltime adds the time. You can combine them for more detailed logs.

Can I customize the log format further?

Yes, you can create a custom logger by implementing your own formatting logic or using third-party libraries like logrus or zap.