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// +build !windows,!nacl,!plan9
package target
import (
"context"
"fmt"
"log/syslog"
"github.com/mattermost/logr"
"github.com/wiggin77/merror"
)
// Syslog outputs log records to local or remote syslog.
type Syslog struct {
logr.Basic
w *syslog.Writer
}
// SyslogParams provides parameters for dialing a syslog daemon.
type SyslogParams struct {
Network string
Raddr string
Priority syslog.Priority
Tag string
}
// NewSyslogTarget creates a target capable of outputting log records to remote or local syslog.
func NewSyslogTarget(filter logr.Filter, formatter logr.Formatter, params *SyslogParams, maxQueue int) (*Syslog, error) {
writer, err := syslog.Dial(params.Network, params.Raddr, params.Priority, params.Tag)
if err != nil {
return nil, err
}
s := &Syslog{w: writer}
s.Basic.Start(s, s, filter, formatter, maxQueue)
return s, nil
}
// Shutdown stops processing log records after making best
// effort to flush queue.
func (s *Syslog) Shutdown(ctx context.Context) error {
errs := merror.New()
err := s.Basic.Shutdown(ctx)
errs.Append(err)
err = s.w.Close()
errs.Append(err)
return errs.ErrorOrNil()
}
// Write converts the log record to bytes, via the Formatter,
// and outputs to syslog.
func (s *Syslog) Write(rec *logr.LogRec) error {
_, stacktrace := s.IsLevelEnabled(rec.Level())
buf := rec.Logger().Logr().BorrowBuffer()
defer rec.Logger().Logr().ReleaseBuffer(buf)
buf, err := s.Formatter().Format(rec, stacktrace, buf)
if err != nil {
return err
}
txt := buf.String()
switch rec.Level() {
case logr.Panic, logr.Fatal:
err = s.w.Crit(txt)
case logr.Error:
err = s.w.Err(txt)
case logr.Warn:
err = s.w.Warning(txt)
case logr.Debug, logr.Trace:
err = s.w.Debug(txt)
default:
// logr.Info plus all custom levels.
err = s.w.Info(txt)
}
if err != nil {
reporter := rec.Logger().Logr().ReportError
reporter(fmt.Errorf("syslog write fail: %w", err))
// syslog writer will try to reconnect.
}
return err
}
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