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// Copyright 2012-2018 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package logger logs to the windows event log
package logger
import (
"fmt"
"os"
"strings"
"golang.org/x/sys/windows/svc/eventlog"
)
var natsEventSource = "NATS-Server"
// SetSyslogName sets the name to use for the system log event source
func SetSyslogName(name string) {
natsEventSource = name
}
// SysLogger logs to the windows event logger
type SysLogger struct {
writer *eventlog.Log
debug bool
trace bool
}
// NewSysLogger creates a log using the windows event logger
func NewSysLogger(debug, trace bool) *SysLogger {
if err := eventlog.InstallAsEventCreate(natsEventSource, eventlog.Info|eventlog.Error|eventlog.Warning); err != nil {
if !strings.Contains(err.Error(), "registry key already exists") {
panic(fmt.Sprintf("could not access event log: %v", err))
}
}
w, err := eventlog.Open(natsEventSource)
if err != nil {
panic(fmt.Sprintf("could not open event log: %v", err))
}
return &SysLogger{
writer: w,
debug: debug,
trace: trace,
}
}
// NewRemoteSysLogger creates a remote event logger
func NewRemoteSysLogger(fqn string, debug, trace bool) *SysLogger {
w, err := eventlog.OpenRemote(fqn, natsEventSource)
if err != nil {
panic(fmt.Sprintf("could not open event log: %v", err))
}
return &SysLogger{
writer: w,
debug: debug,
trace: trace,
}
}
func formatMsg(tag, format string, v ...interface{}) string {
orig := fmt.Sprintf(format, v...)
return fmt.Sprintf("pid[%d][%s]: %s", os.Getpid(), tag, orig)
}
// Noticef logs a notice statement
func (l *SysLogger) Noticef(format string, v ...interface{}) {
l.writer.Info(1, formatMsg("NOTICE", format, v...))
}
// Noticef logs a notice statement
func (l *SysLogger) Warnf(format string, v ...interface{}) {
l.writer.Info(1, formatMsg("WARN", format, v...))
}
// Fatalf logs a fatal error
func (l *SysLogger) Fatalf(format string, v ...interface{}) {
msg := formatMsg("FATAL", format, v...)
l.writer.Error(5, msg)
panic(msg)
}
// Errorf logs an error statement
func (l *SysLogger) Errorf(format string, v ...interface{}) {
l.writer.Error(2, formatMsg("ERROR", format, v...))
}
// Debugf logs a debug statement
func (l *SysLogger) Debugf(format string, v ...interface{}) {
if l.debug {
l.writer.Info(3, formatMsg("DEBUG", format, v...))
}
}
// Tracef logs a trace statement
func (l *SysLogger) Tracef(format string, v ...interface{}) {
if l.trace {
l.writer.Info(4, formatMsg("TRACE", format, v...))
}
}
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