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