114 lines
3.3 KiB
Go
114 lines
3.3 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package log
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import (
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"bytes"
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"io"
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"log/syslog"
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"os"
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"github.com/sirupsen/logrus"
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lSyslog "github.com/sirupsen/logrus/hooks/syslog"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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)
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// Initialize initializes the global Logrus logger, reading the desired
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// log level from the viper store, or using a default if the level
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// has not been set in viper.
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//
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// It also sets the output to log.SplitErrOutputs(...)
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// so you get error logs on stderr and normal logs on stdout.
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//
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// If syslog settings are also in viper, then Syslog will be initialized as well.
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func Initialize() error {
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out := SplitErrOutputs(os.Stdout, os.Stderr)
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logrus.SetOutput(out)
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// check if a desired log level has been set
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if lvl := config.GetLogLevel(); lvl != "" {
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level, err := logrus.ParseLevel(lvl)
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if err != nil {
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return err
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}
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logrus.SetLevel(level)
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if level == logrus.TraceLevel {
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logrus.SetReportCaller(true)
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}
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}
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// set our custom formatter options
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logrus.SetFormatter(&logrus.TextFormatter{
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DisableColors: true,
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FullTimestamp: true,
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// By default, quoting is enabled to help differentiate key-value
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// fields in log lines. But when debug (or higher, e.g. trace) logging
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// is enabled, we disable this. This allows easier copy-pasting of
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// entry fields without worrying about escaped quotes.
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DisableQuote: logrus.GetLevel() >= logrus.DebugLevel,
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})
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// check if syslog has been enabled, and configure it if so
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if config.GetSyslogEnabled() {
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protocol := config.GetSyslogProtocol()
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address := config.GetSyslogAddress()
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hook, err := lSyslog.NewSyslogHook(protocol, address, syslog.LOG_INFO, "")
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if err != nil {
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return err
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}
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logrus.AddHook(&trimHook{hook})
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}
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return nil
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}
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// SplitErrOutputs returns an OutputSplitFunc that splits output to either one of
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// two given outputs depending on whether the level is "error","fatal","panic".
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func SplitErrOutputs(out, err io.Writer) OutputSplitFunc {
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return func(lvl []byte) io.Writer {
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switch string(lvl) /* convert to str for compare is no-alloc */ {
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case "error", "fatal", "panic":
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return err
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default:
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return out
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}
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}
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}
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// OutputSplitFunc implements the io.Writer interface for use with Logrus, and simply
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// splits logs between stdout and stderr depending on their severity.
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type OutputSplitFunc func(lvl []byte) io.Writer
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var levelBytes = []byte("level=")
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func (fn OutputSplitFunc) Write(b []byte) (int, error) {
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var lvl []byte
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if i := bytes.Index(b, levelBytes); i >= 0 {
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blvl := b[i+len(levelBytes):]
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if i := bytes.IndexByte(blvl, ' '); i >= 0 {
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lvl = blvl[:i]
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}
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}
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return fn(lvl).Write(b)
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}
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