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logger.go
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logger.go
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// Copyright 2016 The G3N Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package logger implements an hierarchical logger used by other packages.
package logger
import (
"fmt"
"strings"
"sync"
"time"
)
// Levels to filter log output
const (
DEBUG = iota
INFO
WARN
ERROR
FATAL
)
// Flags used to format the log date/time
const (
// Show date
FDATE = 1 << iota
// Show hour, minutes and seconds
FTIME
// Show milliseconds after FTIME
FMILIS
// Show microseconds after FTIME
FMICROS
// Show nanoseconfs after TIME
FNANOS
)
// List of level names
var levelNames = [...]string{"DEBUG", "INFO", "WARN", "ERROR", "FATAL"}
// Default logger and global mutex
var Default *Logger
var rootLoggers = []*Logger{}
var mutex sync.Mutex
// LoggerWriter is the interface for all logger writers
type LoggerWriter interface {
Write(*Event)
Close()
Sync()
}
// Logger Object state structure
type Logger struct {
name string
prefix string
enabled bool
level int
format int
outputs []LoggerWriter
parent *Logger
children []*Logger
}
// Event is a logger event passed from the logger to its writers.
type Event struct {
time time.Time
level int
usermsg string
fmsg string
}
// creates the default logger
func init() {
Default = New("G3N", nil)
Default.SetFormat(FTIME | FMICROS)
Default.AddWriter(NewConsole(false))
}
// New creates and returns a new logger with the specified name.
// If a parent logger is specified, the created logger inherits the
// parent's configuration.
func New(name string, parent *Logger) *Logger {
self := new(Logger)
self.name = name
self.prefix = name
self.enabled = true
self.level = ERROR
self.format = FDATE | FTIME | FMICROS
self.outputs = make([]LoggerWriter, 0)
self.children = make([]*Logger, 0)
self.parent = parent
if parent != nil {
self.prefix = parent.prefix + "/" + name
self.enabled = parent.enabled
self.level = parent.level
self.format = parent.format
parent.children = append(parent.children, self)
} else {
rootLoggers = append(rootLoggers, self)
}
return self
}
// SetLevel sets the current level of this logger.
// Only log messages with levels with the same or higher
// priorities than the current level will be emitted.
func (l *Logger) SetLevel(level int) {
if level < DEBUG || level > FATAL {
return
}
l.level = level
}
// SetLevelByName sets the current level of this logger by level name:
// debug|info|warn|error|fatal (case ignored.)
// Only log messages with levels with the same or higher
// priorities than the current level will be emitted.
func (l *Logger) SetLevelByName(lname string) error {
var level int
lname = strings.ToUpper(lname)
for level = 0; level < len(levelNames); level++ {
if lname == levelNames[level] {
l.level = level
return nil
}
}
return fmt.Errorf("Invalid log level name: %s", lname)
}
// SetFormat sets the logger date/time message format
func (l *Logger) SetFormat(format int) {
l.format = format
}
// AddWriter adds a writer to the current outputs of this logger.
func (l *Logger) AddWriter(writer LoggerWriter) {
l.outputs = append(l.outputs, writer)
}
// RemoveWriter removes the specified writer from the current outputs of this logger.
func (l *Logger) RemoveWriter(writer LoggerWriter) {
for pos, w := range l.outputs {
if w != writer {
continue
}
l.outputs = append(l.outputs[:pos], l.outputs[pos+1:]...)
}
}
// EnableChild enables or disables this logger child logger with
// the specified name.
func (l *Logger) EnableChild(name string, state bool) {
for _, c := range l.children {
if c.name == name {
c.enabled = state
}
}
}
// Debug emits a DEBUG level log message
func (l *Logger) Debug(format string, v ...interface{}) {
l.Log(DEBUG, format, v...)
}
// Info emits an INFO level log message
func (l *Logger) Info(format string, v ...interface{}) {
l.Log(INFO, format, v...)
}
// Warn emits a WARN level log message
func (l *Logger) Warn(format string, v ...interface{}) {
l.Log(WARN, format, v...)
}
// Error emits an ERROR level log message
func (l *Logger) Error(format string, v ...interface{}) {
l.Log(ERROR, format, v...)
}
// Fatal emits a FATAL level log message
func (l *Logger) Fatal(format string, v ...interface{}) {
l.Log(FATAL, format, v...)
}
// Log emits a log message with the specified level
func (l *Logger) Log(level int, format string, v ...interface{}) {
// Ignores message if logger not enabled or with level bellow the current one.
if !l.enabled || level < l.level {
return
}
// Formats date
now := time.Now().UTC()
year, month, day := now.Date()
hour, min, sec := now.Clock()
fdate := []string{}
if l.format&FDATE != 0 {
fdate = append(fdate, fmt.Sprintf("%04d/%02d/%02d", year, month, day))
}
if l.format&FTIME != 0 {
if len(fdate) > 0 {
fdate = append(fdate, "-")
}
fdate = append(fdate, fmt.Sprintf("%02d:%02d:%02d", hour, min, sec))
var sdecs string
if l.format&FMILIS != 0 {
sdecs = fmt.Sprintf(".%.03d", now.Nanosecond()/1000000)
} else if l.format&FMICROS != 0 {
sdecs = fmt.Sprintf(".%.06d", now.Nanosecond()/1000)
} else if l.format&FNANOS != 0 {
sdecs = fmt.Sprintf(".%.09d", now.Nanosecond())
}
fdate = append(fdate, sdecs)
}
// Formats message
usermsg := fmt.Sprintf(format, v...)
prefix := l.prefix
msg := fmt.Sprintf("%s:%s:%s:%s\n", strings.Join(fdate, ""), levelNames[level][:1], prefix, usermsg)
// Log event
var event = Event{
time: now,
level: level,
usermsg: usermsg,
fmsg: msg,
}
// Writes message to this logger and its ancestors.
mutex.Lock()
defer mutex.Unlock()
l.writeAll(&event)
// Close all logger writers
if level == FATAL {
for _, w := range l.outputs {
w.Close()
}
panic("LOG FATAL")
}
}
// write message to this logger output and of all of its ancestors.
func (l *Logger) writeAll(event *Event) {
for _, w := range l.outputs {
w.Write(event)
w.Sync()
}
if l.parent != nil {
l.parent.writeAll(event)
}
}
//
// Functions for the Default Logger
//
// Log emits a log message with the specified level
func Log(level int, format string, v ...interface{}) {
Default.Log(level, format, v...)
}
// SetLevel sets the current level of the default logger.
// Only log messages with levels with the same or higher
// priorities than the current level will be emitted.
func SetLevel(level int) {
Default.SetLevel(level)
}
// SetLevelByName sets the current level of the default logger by level name:
// debug|info|warn|error|fatal (case ignored.)
// Only log messages with levels with the same or higher
// priorities than the current level will be emitted.
func SetLevelByName(lname string) {
Default.SetLevelByName(lname)
}
// SetFormat sets the date/time message format of the default logger.
func SetFormat(format int) {
Default.SetFormat(format)
}
// AddWriter adds a writer to the current outputs of the default logger.
func AddWriter(writer LoggerWriter) {
Default.AddWriter(writer)
}
// Debug emits a DEBUG level log message
func Debug(format string, v ...interface{}) {
Default.Debug(format, v...)
}
// Info emits an INFO level log message
func Info(format string, v ...interface{}) {
Default.Info(format, v...)
}
// Warn emits a WARN level log message
func Warn(format string, v ...interface{}) {
Default.Warn(format, v...)
}
// Error emits an ERROR level log message
func Error(format string, v ...interface{}) {
Default.Error(format, v...)
}
// Fatal emits a FATAL level log message
func Fatal(format string, v ...interface{}) {
Default.Fatal(format, v...)
}
// Find finds a logger with the specified path.
func Find(path string) *Logger {
parts := strings.Split(strings.ToUpper(path), "/")
level := 0
var find func([]*Logger) *Logger
find = func(logs []*Logger) *Logger {
for _, l := range logs {
if l.name != parts[level] {
continue
}
if level == len(parts)-1 {
return l
}
level++
return find(l.children)
}
return nil
}
return find(rootLoggers)
}