78 lines
2.4 KiB
Go
78 lines
2.4 KiB
Go
//
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// Copyright (c) 2022 Ted Unangst <tedu@tedunangst.com>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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package main
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import (
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"flag"
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"io/ioutil"
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"log"
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"log/syslog"
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"os"
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)
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// log.Default() not added until go 1.16
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func logdefault() *log.Logger {
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return log.New(os.Stderr, os.Args[0], log.LstdFlags)
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}
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var elog = logdefault()
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var ilog = logdefault()
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var dlog = logdefault()
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var elogname, ilogname, dlogname, alllogname string
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func init() {
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flag.StringVar(&elogname, "errorlog", "stderr", "error log file (or stderr, null, syslog)")
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flag.StringVar(&ilogname, "infolog", "stderr", "info log file (or stderr, null, syslog)")
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flag.StringVar(&dlogname, "debuglog", "stderr", "debug log file (or stderr, null, syslog)")
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flag.StringVar(&alllogname, "log", "stderr", "combined log file (or stderr, null, syslog)")
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}
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func initLogging(elogname, ilogname, dlogname string) {
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elog = openlog(elogname, syslog.LOG_ERR)
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ilog = openlog(ilogname, syslog.LOG_INFO)
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dlog = openlog(dlogname, syslog.LOG_DEBUG)
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}
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func openlog(name string, prio syslog.Priority) *log.Logger {
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if name == "stderr" {
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return log.New(os.Stderr, os.Args[0], log.LstdFlags)
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}
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if name == "stdout" {
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return log.New(os.Stdout, os.Args[0], log.LstdFlags)
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}
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if name == "null" {
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return log.New(ioutil.Discard, os.Args[0], log.LstdFlags)
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}
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if name == "syslog" {
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logger, err := syslog.NewLogger(syslog.LOG_UUCP|prio, 0)
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if err != nil {
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elog.Printf("can't create syslog: %s", err)
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return logdefault()
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}
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return logger
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}
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fd, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0600)
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if err != nil {
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elog.Printf("can't open log file %s: %s", name, err)
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return logdefault()
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}
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logger := log.New(fd, os.Args[0], log.LstdFlags)
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logger.Printf("new log started")
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return logger
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}
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