maddy

 1//go:build !windows && !plan9
 2// +build !windows,!plan9
 3
 4/*
 5Maddy Mail Server - Composable all-in-one email server.
 6Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
 7
 8This program is free software: you can redistribute it and/or modify
 9it under the terms of the GNU General Public License as published by
10the Free Software Foundation, either version 3 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program.  If not, see <https://www.gnu.org/licenses/>.
20*/
21
22package log
23
24import (
25	"fmt"
26	"log/syslog"
27	"os"
28	"time"
29)
30
31type syslogOut struct {
32	w *syslog.Writer
33}
34
35func (s syslogOut) Write(stamp time.Time, debug bool, msg string) {
36	var err error
37	if debug {
38		err = s.w.Debug(msg + "\n")
39	} else {
40		err = s.w.Info(msg + "\n")
41	}
42
43	if err != nil {
44		fmt.Fprintf(os.Stderr, "!!! Failed to send message to syslog daemon: %v\n", err)
45	}
46}
47
48func (s syslogOut) Close() error {
49	return s.w.Close()
50}
51
52// SyslogOutput returns a log.Output implementation that will send
53// messages to the system syslog daemon.
54//
55// Regular messages will be written with INFO priority,
56// debug messages will be written with DEBUG priority.
57//
58// Returned log.Output object is goroutine-safe.
59func SyslogOutput() (Output, error) {
60	w, err := syslog.New(syslog.LOG_MAIL|syslog.LOG_INFO, "maddy")
61	return syslogOut{w}, err
62}