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/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package log
import (
"bytes"
"io"
"log/syslog"
"os"
"github.com/sirupsen/logrus"
lSyslog "github.com/sirupsen/logrus/hooks/syslog"
"github.com/spf13/viper"
"github.com/superseriousbusiness/gotosocial/internal/config"
)
// Initialize initializes the global Logrus logger, reading the desired
// log level from the viper store, or using a default if the level
// has not been set in viper.
//
// It also sets the output to log.SplitErrOutputs(...)
// so you get error logs on stderr and normal logs on stdout.
//
// If syslog settings are also in viper, then Syslog will be initialized as well.
func Initialize() error {
out := SplitErrOutputs(os.Stdout, os.Stderr)
logrus.SetOutput(out)
logrus.SetFormatter(&logrus.TextFormatter{
DisableColors: true,
DisableQuote: true,
FullTimestamp: true,
})
keys := config.Keys
// check if a desired log level has been set
logLevel := viper.GetString(keys.LogLevel)
if logLevel != "" {
level, err := logrus.ParseLevel(logLevel)
if err != nil {
return err
}
logrus.SetLevel(level)
if level == logrus.TraceLevel {
logrus.SetReportCaller(true)
}
}
// check if syslog has been enabled, and configure it if so
if syslogEnabled := viper.GetBool(keys.SyslogEnabled); syslogEnabled {
protocol := viper.GetString(keys.SyslogProtocol)
address := viper.GetString(keys.SyslogAddress)
hook, err := lSyslog.NewSyslogHook(protocol, address, syslog.LOG_INFO, "")
if err != nil {
return err
}
logrus.AddHook(&trimHook{hook})
}
return nil
}
// SplitErrOutputs returns an OutputSplitFunc that splits output to either one of
// two given outputs depending on whether the level is "error","fatal","panic".
func SplitErrOutputs(out, err io.Writer) OutputSplitFunc {
return func(lvl []byte) io.Writer {
switch string(lvl) /* convert to str for compare is no-alloc */ {
case "error", "fatal", "panic":
return err
default:
return out
}
}
}
// OutputSplitFunc implements the io.Writer interface for use with Logrus, and simply
// splits logs between stdout and stderr depending on their severity.
type OutputSplitFunc func(lvl []byte) io.Writer
var levelBytes = []byte("level=")
func (fn OutputSplitFunc) Write(b []byte) (int, error) {
var lvl []byte
if i := bytes.Index(b, levelBytes); i >= 0 {
blvl := b[i+len(levelBytes):]
if i := bytes.IndexByte(blvl, ' '); i >= 0 {
lvl = blvl[:i]
}
}
return fn(lvl).Write(b)
}
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