common/defaultlog_syslog.go

// +build !windows,!nacl,!plan9

// Copyright © Microsoft <wastore@microsoft.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package common

import (
	"log"
	"log/syslog"
)

// forceLog should rarely be used. It forceable logs an entry to the
// Windows Event Log (on Windows) or to the SysLog (on Linux)
func forceLog(level LogLevel, msg string) {
	if defaultLogger == nil {
		return // Return fast if we failed to create the logger.
	}
	// We are logging it, ensure trailing newline
	if len(msg) == 0 || msg[len(msg)-1] != '\n' {
		msg += "\n" // Ensure trailing newline
	}
	switch level {
	case LogFatal:
		defaultLogger.Fatal(msg)
	case LogPanic:
		defaultLogger.Panic(msg)
	case LogError, LogWarning, LogInfo:
		defaultLogger.Print(msg)
	}
}

var defaultLogger = func() *log.Logger {
	l, _ := syslog.NewLogger(syslog.LOG_USER|syslog.LOG_WARNING, log.LstdFlags)
	return l
}()