History

Seth Hoenig 435c0d9fc8 deps: Switch to Go modules for dependency management This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.		2020-06-02 14:30:36 -05:00
..
.gitignore	deps: Switch to Go modules for dependency management	2020-06-02 14:30:36 -05:00
LICENSE	Using godeps to build	2016-02-12 10:02:16 -08:00
README.md	Using godeps to build	2016-02-12 10:02:16 -08:00
go.mod	deps: Switch to Go modules for dependency management	2020-06-02 14:30:36 -05:00
level.go	Using godeps to build	2016-02-12 10:02:16 -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.