mirror of
https://github.com/ClusterCockpit/cc-backend
synced 2024-09-20 11:27:26 +02:00
131 lines
2.5 KiB
Go
131 lines
2.5 KiB
Go
// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
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// All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package log
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import (
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"fmt"
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"io"
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"log"
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"os"
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)
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// Provides a simple way of logging with different levels.
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// Time/Data are not logged on purpose because systemd adds
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// them for us.
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//
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// Uses these prefixes: https://www.freedesktop.org/software/systemd/man/sd-daemon.html
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var (
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DebugWriter io.Writer = os.Stderr
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InfoWriter io.Writer = os.Stderr
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WarnWriter io.Writer = os.Stderr
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ErrWriter io.Writer = os.Stderr
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)
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var (
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DebugPrefix string = "<7>[DEBUG] "
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InfoPrefix string = "<6>[INFO] "
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WarnPrefix string = "<4>[WARNING] "
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ErrPrefix string = "<3>[ERROR] "
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)
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var (
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DebugLog *log.Logger = log.New(DebugWriter, DebugPrefix, 0)
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InfoLog *log.Logger = log.New(InfoWriter, InfoPrefix, 0)
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WarnLog *log.Logger = log.New(WarnWriter, WarnPrefix, 0)
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ErrLog *log.Logger = log.New(ErrWriter, ErrPrefix, 0)
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)
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func init() {
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if lvl, ok := os.LookupEnv("LOGLEVEL"); ok {
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switch lvl {
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case "err", "fatal":
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WarnWriter = io.Discard
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fallthrough
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case "warn":
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InfoWriter = io.Discard
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fallthrough
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case "info":
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DebugWriter = io.Discard
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case "debug":
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// Nothing to do...
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default:
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Warnf("environment variable LOGLEVEL has invalid value %#v", lvl)
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}
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}
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}
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func Debug(v ...interface{}) {
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if DebugWriter != io.Discard {
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DebugLog.Print(v...)
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}
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}
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func Info(v ...interface{}) {
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if InfoWriter != io.Discard {
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InfoLog.Print(v...)
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}
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}
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func Print(v ...interface{}) {
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Info(v...)
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}
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func Warn(v ...interface{}) {
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if WarnWriter != io.Discard {
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WarnLog.Print(v...)
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}
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}
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func Error(v ...interface{}) {
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if ErrWriter != io.Discard {
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ErrLog.Print(v...)
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}
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}
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func Fatal(v ...interface{}) {
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Error(v...)
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os.Exit(1)
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}
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func Debugf(format string, v ...interface{}) {
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if DebugWriter != io.Discard {
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DebugLog.Printf(format, v...)
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}
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}
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func Infof(format string, v ...interface{}) {
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if InfoWriter != io.Discard {
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InfoLog.Printf(format, v...)
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}
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}
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func Printf(format string, v ...interface{}) {
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Infof(format, v...)
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}
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func Finfof(w io.Writer, format string, v ...interface{}) {
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if w != io.Discard {
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fmt.Fprintf(InfoWriter, InfoPrefix+format+"\n", v...)
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}
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}
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func Warnf(format string, v ...interface{}) {
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if WarnWriter != io.Discard {
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WarnLog.Printf(format, v...)
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}
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}
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func Errorf(format string, v ...interface{}) {
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if ErrWriter != io.Discard {
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ErrLog.Printf(format, v...)
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}
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}
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func Fatalf(format string, v ...interface{}) {
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Errorf(format, v...)
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os.Exit(1)
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}
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