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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 provides logging facilities for the NATS server
package logger
import (
"fmt"
"log"
"os"
)
// Logger is the server logger
type Logger struct {
logger *log.Logger
debug bool
trace bool
infoLabel string
warnLabel string
errorLabel string
fatalLabel string
debugLabel string
traceLabel string
logFile *os.File // file pointer for the file logger.
}
// NewStdLogger creates a logger with output directed to Stderr
func NewStdLogger(time, debug, trace, colors, pid bool) *Logger {
flags := 0
if time {
flags = log.LstdFlags | log.Lmicroseconds
}
pre := ""
if pid {
pre = pidPrefix()
}
l := &Logger{
logger: log.New(os.Stderr, pre, flags),
debug: debug,
trace: trace,
}
if colors {
setColoredLabelFormats(l)
} else {
setPlainLabelFormats(l)
}
return l
}
// NewFileLogger creates a logger with output directed to a file
func NewFileLogger(filename string, time, debug, trace, pid bool) *Logger {
fileflags := os.O_WRONLY | os.O_APPEND | os.O_CREATE
f, err := os.OpenFile(filename, fileflags, 0660)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
flags := 0
if time {
flags = log.LstdFlags | log.Lmicroseconds
}
pre := ""
if pid {
pre = pidPrefix()
}
l := &Logger{
logger: log.New(f, pre, flags),
debug: debug,
trace: trace,
logFile: f,
}
setPlainLabelFormats(l)
return l
}
// NewTestLogger creates a logger with output directed to Stderr with a prefix.
// Useful for tracing in tests when multiple servers are in the same pid
func NewTestLogger(prefix string, time bool) *Logger {
flags := 0
if time {
flags = log.LstdFlags | log.Lmicroseconds
}
l := &Logger{
logger: log.New(os.Stderr, prefix, flags),
debug: true,
trace: true,
}
setColoredLabelFormats(l)
return l
}
// Close implements the io.Closer interface to clean up
// resources in the server's logger implementation.
// Caller must ensure threadsafety.
func (l *Logger) Close() error {
if f := l.logFile; f != nil {
l.logFile = nil
return f.Close()
}
return nil
}
// Generate the pid prefix string
func pidPrefix() string {
return fmt.Sprintf("[%d] ", os.Getpid())
}
func setPlainLabelFormats(l *Logger) {
l.infoLabel = "[INF] "
l.debugLabel = "[DBG] "
l.warnLabel = "[WRN] "
l.errorLabel = "[ERR] "
l.fatalLabel = "[FTL] "
l.traceLabel = "[TRC] "
}
func setColoredLabelFormats(l *Logger) {
colorFormat := "[\x1b[%sm%s\x1b[0m] "
l.infoLabel = fmt.Sprintf(colorFormat, "32", "INF")
l.debugLabel = fmt.Sprintf(colorFormat, "36", "DBG")
l.warnLabel = fmt.Sprintf(colorFormat, "0;93", "WRN")
l.errorLabel = fmt.Sprintf(colorFormat, "31", "ERR")
l.fatalLabel = fmt.Sprintf(colorFormat, "31", "FTL")
l.traceLabel = fmt.Sprintf(colorFormat, "33", "TRC")
}
// Noticef logs a notice statement
func (l *Logger) Noticef(format string, v ...interface{}) {
l.logger.Printf(l.infoLabel+format, v...)
}
// Warnf logs a notice statement
func (l *Logger) Warnf(format string, v ...interface{}) {
l.logger.Printf(l.warnLabel+format, v...)
}
// Errorf logs an error statement
func (l *Logger) Errorf(format string, v ...interface{}) {
l.logger.Printf(l.errorLabel+format, v...)
}
// Fatalf logs a fatal error
func (l *Logger) Fatalf(format string, v ...interface{}) {
l.logger.Fatalf(l.fatalLabel+format, v...)
}
// Debugf logs a debug statement
func (l *Logger) Debugf(format string, v ...interface{}) {
if l.debug {
l.logger.Printf(l.debugLabel+format, v...)
}
}
// Tracef logs a trace statement
func (l *Logger) Tracef(format string, v ...interface{}) {
if l.trace {
l.logger.Printf(l.traceLabel+format, v...)
}
}
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