logw

Overview ¶

This package provides simple structured logging. logw.LogWriter(...) returns io.Writer that most of the existing loggers can consume. It will transform input according to logw.Formatter you choose. You can control log level by using provided logw.Debug|Info|Wran|Error|Fatal variables like this:

log.Println(logw.Error, "your message")

or like this:

log.Prinln(logw.Error.WithMessage("Hello %s", "World"))

To install logw:

go get -u github.com/andriiyaremenko/logwriter

How to use:

import (
	"log"
	logw "github.com/andriiyaremenko/logwriter"
)
func main() {
	ctx := context.Background()
	log := log.New(logw.JSONLogWriter(ctx, os.Stdout), "", log.Lmsgprefix)

	log.Printf("starting work: %s", "important work")
	log.Println(logw.Warn.WithString("work", "important work"), "is done")
	// will output:
	//  {"date":"20**-**-**T**:**:**Z","level":"info","levelCode":2,"message":"starting work: important work"}
	//  {"date":"20**-**-**T**:**:**Z","level":"warn","levelCode":3,"message":"is done","work":["important work"]}
}