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012a1e0497
Provide a bit more journald integration. Specifically: - support emission of printk-style log level prefixes, documented in [`sd-daemon`(3)](https://man7.org/linux/man-pages/man3/sd-daemon.3.html#DESCRIPTION), that allow journald to automatically annotate stderr log lines with their level; - add a new "journaldflags" item that is supposed to be used in place of "stdflags" when under journald to reduce log clutter (i. e. strip date/time info to avoid duplication, and use log level prefixes instead of textual log levels); - detect whether stderr and/or stdout are attached to journald by parsing `$JOURNAL_STREAM` environment variable and adjust console logger defaults accordingly. <!--start release-notes-assistant--> ## Draft release notes <!--URL:https://codeberg.org/forgejo/forgejo--> - Features - [PR](https://codeberg.org/forgejo/forgejo/pulls/2869): <!--number 2869 --><!--line 0 --><!--description bG9nOiBqb3VybmFsZCBpbnRlZ3JhdGlvbg==-->log: journald integration<!--description--> <!--end release-notes-assistant--> Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/2869 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: Ivan Shapovalov <intelfx@intelfx.name> Co-committed-by: Ivan Shapovalov <intelfx@intelfx.name>
136 lines
2.7 KiB
Go
136 lines
2.7 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package log
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import (
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"bytes"
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"strings"
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"code.gitea.io/gitea/modules/json"
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)
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// Level is the level of the logger
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type Level int
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const (
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UNDEFINED Level = iota
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TRACE
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DEBUG
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INFO
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WARN
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ERROR
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FATAL
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NONE
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)
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const CRITICAL = ERROR // most logger frameworks doesn't support CRITICAL, and it doesn't seem useful
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var toString = map[Level]string{
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UNDEFINED: "undefined",
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TRACE: "trace",
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DEBUG: "debug",
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INFO: "info",
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WARN: "warn",
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ERROR: "error",
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FATAL: "fatal",
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NONE: "none",
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}
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// Machine-readable log level prefixes as defined in sd-daemon(3).
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//
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// "If a systemd service definition file is configured with StandardError=journal
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// or StandardError=kmsg (and similar with StandardOutput=), these prefixes can
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// be used to encode a log level in lines printed. <...> To use these prefixes
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// simply prefix every line with one of these strings. A line that is not prefixed
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// will be logged at the default log level SD_INFO."
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var toJournalPrefix = map[Level]string{
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TRACE: "<7>", // SD_DEBUG
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DEBUG: "<6>", // SD_INFO
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INFO: "<5>", // SD_NOTICE
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WARN: "<4>", // SD_WARNING
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ERROR: "<3>", // SD_ERR
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FATAL: "<2>", // SD_CRIT
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}
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var toLevel = map[string]Level{
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"undefined": UNDEFINED,
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"trace": TRACE,
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"debug": DEBUG,
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"info": INFO,
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"warn": WARN,
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"warning": WARN,
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"error": ERROR,
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"fatal": FATAL,
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"none": NONE,
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}
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var levelToColor = map[Level][]ColorAttribute{
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TRACE: {Bold, FgCyan},
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DEBUG: {Bold, FgBlue},
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INFO: {Bold, FgGreen},
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WARN: {Bold, FgYellow},
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ERROR: {Bold, FgRed},
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FATAL: {Bold, BgRed},
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NONE: {Reset},
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}
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func (l Level) String() string {
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s, ok := toString[l]
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if ok {
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return s
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}
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return "info"
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}
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func (l Level) JournalPrefix() string {
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return toJournalPrefix[l]
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}
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func (l Level) ColorAttributes() []ColorAttribute {
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color, ok := levelToColor[l]
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if ok {
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return color
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}
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none := levelToColor[NONE]
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return none
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}
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// MarshalJSON takes a Level and turns it into text
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func (l Level) MarshalJSON() ([]byte, error) {
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buffer := bytes.NewBufferString(`"`)
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buffer.WriteString(toString[l])
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buffer.WriteString(`"`)
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return buffer.Bytes(), nil
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}
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// UnmarshalJSON takes text and turns it into a Level
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func (l *Level) UnmarshalJSON(b []byte) error {
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var tmp any
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err := json.Unmarshal(b, &tmp)
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if err != nil {
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return err
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}
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switch v := tmp.(type) {
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case string:
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*l = LevelFromString(v)
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case int:
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*l = LevelFromString(Level(v).String())
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default:
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*l = INFO
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}
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return nil
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}
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// LevelFromString takes a level string and returns a Level
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func LevelFromString(level string) Level {
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if l, ok := toLevel[strings.ToLower(level)]; ok {
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return l
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}
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return INFO
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}
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