更改日志输出日志的格式

Question

I use go logrus and I need to change the format of the output message, I try several of things without success

what I need is format like this with formatter of logrus

[error]: datetime - message

What I've tried without success is this

 logger := &logrus.Logger{
        Out:   os.Stderr,
        Level: level,
        Formatter: &logrus.TextFormatter{
            DisableColors: true,
            TimestampFormat : "2006-01-02 15:04:05",
            FullTimestamp:true,

        },
    }

This produce the following

time="2018-02-25 10:42:20" level=error msg="Starting Process"

And I want it to be

[INFO]:2018-02-25 10:42:20 - Starting Process

update In case zap is better to customize https://github.com/uber-go/zap it could also be a solution

Answer 1

Standard logrus-prefixed-formater usage

To achieve this you need to make your own TextFormater which will satisfy logrus Formatter interface. Then when you create your own formater you pass it on logrus struct initialization. Other way arround and close to what you wanna achieve is this formater https://github.com/x-cray/logrus-prefixed-formatter . Based on this formater you can create your own.

In your case you need to use like that

logger := &logrus.Logger{
        Out:   os.Stderr,
        Level: logrus.DebugLevel,
        Formatter: &prefixed.TextFormatter{
            DisableColors: true,
            TimestampFormat : "2006-01-02 15:04:05",
            FullTimestamp:true,
            ForceFormatting: true,
        },
    }

---

Customized output of logrus-prefixed-formater

Link to gist to use copy of logrus-prefixed-formatter with changed format https://gist.github.com/t-tomalak/146e4269460fc63d6938264bb5aaa1db

I leave this option if u in the end wanna use it, as in this version you have exact format you want, coloring, and other features available in standard formatter

---

Custom formatter

Third option is to use package create by me https://github.com/t-tomalak/logrus-easy-formatter. It provide simple option to format output as you want and is it only purpose. I removed not necessary options which probably you wouldn't use.

package main

import (
    "os"

    "github.com/sirupsen/logrus"
    "github.com/t-tomalak/logrus-easy-formatter"
)

func main() {
    logger := &logrus.Logger{
        Out:   os.Stderr,
        Level: logrus.DebugLevel,
        Formatter: &easy.Formatter{
            TimestampFormat: "2006-01-02 15:04:05",
            LogFormat:       "[%lvl%]: %time% - %msg%",
        },
    }

    logger.Printf("Log message")
}

This sample code will produce:

[INFO]: 2018-02-27 19:16:55 - Log message

Also I wanna point out that if in the future wanna change formatter there shouldn't be any problems to use i.e. default Logrus TextFormatter/JSONFormatter.

---

Customized output of logrus-prefixed-formater

If you really don't wanna copy this formatter to your project you can use my fork logrus-prefixed-formater with copy/pasted this code https://github.com/t-tomalak/logrus-prefixed-formatter

You can use it like standard option but remember to change import to my repository in you go file

logger := &logrus.Logger{
        Out:   os.Stderr,
        Level: logrus.DebugLevel,
        Formatter: &prefixed.TextFormatter{
            DisableColors: true,
            TimestampFormat : "2006-01-02 15:04:05",
            FullTimestamp:true,
            ForceFormatting: true,
        },
    }