open-consul/vendor/github.com/hashicorp/logutils
Jeff Mitchell b43800125c
Update vendoring from go mod. (#5566)
2019-03-26 17:50:42 -04:00
..
.gitignore Update vendoring from go mod. (#5566) 2019-03-26 17:50:42 -04:00
LICENSE Manage dependencies via Godep 2016-02-12 16:50:37 -08:00
README.md Manage dependencies via Godep 2016-02-12 16:50:37 -08:00
go.mod Update vendoring from go mod. (#5566) 2019-03-26 17:50:42 -04:00
level.go Manage dependencies via Godep 2016-02-12 16:50:37 -08:00

README.md

logutils

logutils is a Go package that augments the standard library "log" package to make logging a bit more modern, without fragmenting the Go ecosystem with new logging packages.

The simplest thing that could possibly work

Presumably your application already uses the default log package. To switch, you'll want your code to look like the following:

package main

import (
	"log"
	"os"

	"github.com/hashicorp/logutils"
)

func main() {
	filter := &logutils.LevelFilter{
		Levels: []logutils.LogLevel{"DEBUG", "WARN", "ERROR"},
		MinLevel: logutils.LogLevel("WARN"),
		Writer: os.Stderr,
	}
	log.SetOutput(filter)

	log.Print("[DEBUG] Debugging") // this will not print
	log.Print("[WARN] Warning") // this will
	log.Print("[ERROR] Erring") // and so will this
	log.Print("Message I haven't updated") // and so will this
}

This logs to standard error exactly like go's standard logger. Any log messages you haven't converted to have a level will continue to print as before.