113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
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// Copyright 2012-2014 Apcera Inc. All rights reserved.
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// +build !windows
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package logger
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import (
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"fmt"
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"log"
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"log/syslog"
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"net/url"
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"os"
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"strings"
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)
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// SysLogger provides a system logger facility
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type SysLogger struct {
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writer *syslog.Writer
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debug bool
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trace bool
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}
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// GetSysLoggerTag generates the tag name for use in syslog statements. If
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// the executable is linked, the name of the link will be used as the tag,
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// otherwise, the name of the executable is used. "gnatsd" is the default
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// for the NATS server.
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func GetSysLoggerTag() string {
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procName := os.Args[0]
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if strings.ContainsRune(procName, os.PathSeparator) {
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parts := strings.FieldsFunc(procName, func(c rune) bool {
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return c == os.PathSeparator
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})
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procName = parts[len(parts)-1]
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}
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return procName
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}
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// NewSysLogger creates a new system logger
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func NewSysLogger(debug, trace bool) *SysLogger {
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w, err := syslog.New(syslog.LOG_DAEMON|syslog.LOG_NOTICE, GetSysLoggerTag())
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if err != nil {
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log.Fatalf("error connecting to syslog: %q", err.Error())
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}
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return &SysLogger{
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writer: w,
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debug: debug,
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trace: trace,
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}
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}
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// NewRemoteSysLogger creates a new remote system logger
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func NewRemoteSysLogger(fqn string, debug, trace bool) *SysLogger {
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network, addr := getNetworkAndAddr(fqn)
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w, err := syslog.Dial(network, addr, syslog.LOG_DEBUG, GetSysLoggerTag())
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if err != nil {
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log.Fatalf("error connecting to syslog: %q", err.Error())
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}
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return &SysLogger{
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writer: w,
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debug: debug,
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trace: trace,
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}
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}
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func getNetworkAndAddr(fqn string) (network, addr string) {
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u, err := url.Parse(fqn)
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if err != nil {
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log.Fatal(err)
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}
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network = u.Scheme
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if network == "udp" || network == "tcp" {
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addr = u.Host
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} else if network == "unix" {
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addr = u.Path
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} else {
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log.Fatalf("error invalid network type: %q", u.Scheme)
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}
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return
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}
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// Noticef logs a notice statement
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func (l *SysLogger) Noticef(format string, v ...interface{}) {
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l.writer.Notice(fmt.Sprintf(format, v...))
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}
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// Fatalf logs a fatal error
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func (l *SysLogger) Fatalf(format string, v ...interface{}) {
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l.writer.Crit(fmt.Sprintf(format, v...))
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}
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// Errorf logs an error statement
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func (l *SysLogger) Errorf(format string, v ...interface{}) {
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l.writer.Err(fmt.Sprintf(format, v...))
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}
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// Debugf logs a debug statement
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func (l *SysLogger) Debugf(format string, v ...interface{}) {
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if l.debug {
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l.writer.Debug(fmt.Sprintf(format, v...))
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}
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}
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// Tracef logs a trace statement
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func (l *SysLogger) Tracef(format string, v ...interface{}) {
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if l.trace {
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l.writer.Notice(fmt.Sprintf(format, v...))
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}
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}
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