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log.go
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log.go
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package log
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path"
"runtime"
"sort"
"strings"
"sync"
"time"
)
// Logger logger interface
type Logger interface {
FatalEnabled() bool
ErrorEnabled() bool
WarnEnabled() bool
InfoEnabled() bool
DebugEnabled() bool
Info(v ...interface{})
Infof(format string, v ...interface{})
Debug(v ...interface{})
Debugf(format string, v ...interface{})
Warning(v ...interface{})
Warningf(format string, v ...interface{})
Error(v ...interface{})
Errorf(format string, v ...interface{})
Fatal(v ...interface{})
Fatalf(format string, v ...interface{})
}
const (
// Ldate flags
Ldate = log.Ldate
// Llongfile flags
Llongfile = log.Llongfile
// Lmicroseconds flags
Lmicroseconds = log.Lmicroseconds
// Lshortfile flags
Lshortfile = log.Lshortfile
// LstdFlags flags
LstdFlags = log.LstdFlags
// Ltime flags
Ltime = log.Ltime
)
type (
// Level log level
Level int
// Type log type
Type int
)
const (
fatalLevel = Type(0x1)
errorLevel = Type(0x2)
warnLevel = Type(0x4)
infoLevel = Type(0x8)
debugLevel = Type(0x10)
)
const (
// LogNone log nothing
LogNone = Level(0x0)
// LogFatal log fatal
LogFatal = LogNone | Level(fatalLevel)
// LogError log error & fatal
LogError = LogFatal | Level(errorLevel)
// LogWarn log warn & error & fatal
LogWarn = LogError | Level(warnLevel)
// LogInfo log info & warn & error & fatal
LogInfo = LogWarn | Level(infoLevel)
// LogDebug log debug & info & warn & error & fatal
LogDebug = LogInfo | Level(debugLevel)
// LogAll log all
LogAll = LogDebug
)
const (
formatTimeDay string = "20060102"
formatTimeHour string = "2006010215"
)
var defaultLog = new()
func init() {
SetFlags(Ldate | Ltime | Lmicroseconds | Lmicroseconds)
SetHighlighting(runtime.GOOS != "windows")
}
// FatalEnabled fatal enabled
func FatalEnabled() bool {
return defaultLog.isLevelEnabled(fatalLevel)
}
// ErrorEnabled error enabled
func ErrorEnabled() bool {
return defaultLog.isLevelEnabled(errorLevel)
}
// WarnEnabled warn enabled
func WarnEnabled() bool {
return defaultLog.isLevelEnabled(warnLevel)
}
// InfoEnabled info enabled
func InfoEnabled() bool {
return defaultLog.isLevelEnabled(infoLevel)
}
// DebugEnabled debug enabled
func DebugEnabled() bool {
return defaultLog.isLevelEnabled(debugLevel)
}
// SetLevel set current log level
func SetLevel(level Level) {
defaultLog.SetLevel(level)
}
// GetLogLevel get current log level
func GetLogLevel() Level {
return defaultLog.level
}
// SetOutput set log file use a writer
func SetOutput(out io.Writer) {
defaultLog.SetOutput(out)
}
// SetOutputByName set log file use file name
func SetOutputByName(path string) error {
return defaultLog.SetOutputByName(path)
}
// SetFlags set log flags
func SetFlags(flags int) {
defaultLog._log.SetFlags(flags)
}
// Info info
func Info(v ...interface{}) {
defaultLog.Info(v...)
}
// Infof infof
func Infof(format string, v ...interface{}) {
defaultLog.Infof(format, v...)
}
// Debug debug
func Debug(v ...interface{}) {
defaultLog.Debug(v...)
}
// Debugf debugf
func Debugf(format string, v ...interface{}) {
defaultLog.Debugf(format, v...)
}
// Warning warning
func Warning(v ...interface{}) {
defaultLog.Warning(v...)
}
// Warningf warningf
func Warningf(format string, v ...interface{}) {
defaultLog.Warningf(format, v...)
}
// Error error
func Error(v ...interface{}) {
defaultLog.Error(v...)
}
// Errorf errorf
func Errorf(format string, v ...interface{}) {
defaultLog.Errorf(format, v...)
}
// Fatal fatal
func Fatal(v ...interface{}) {
defaultLog.Fatal(v...)
}
// Fatalf fatalf
func Fatalf(format string, v ...interface{}) {
defaultLog.Fatalf(format, v...)
}
// SetLevelByString set log by string level
func SetLevelByString(level string) {
defaultLog.SetLevelByString(level)
}
// SetHighlighting set highlighting log
func SetHighlighting(highlighting bool) {
defaultLog.SetHighlighting(highlighting)
}
// SetRotateByDay set default log rotate by day
func SetRotateByDay() {
defaultLog.SetRotateByDay()
}
// SetRotateByHour set default log rotate by hour
func SetRotateByHour() {
defaultLog.SetRotateByHour()
}
// SetLogCount set log count
func SetLogCount(value int) {
defaultLog.SetLogCount(value)
}
type logger struct {
_log *log.Logger
level Level
highlighting bool
dailyRolling bool
hourRolling bool
logCount int
fileName string
logSuffix string
fd *os.File
lock sync.Mutex
}
func (l *logger) SetHighlighting(highlighting bool) {
l.highlighting = highlighting
}
func (l *logger) SetLevel(level Level) {
l.level = level
}
func (l *logger) SetLevelByString(level string) {
l.level = stringToLogLevel(level)
}
func (l *logger) SetLogCount(value int) {
l.logCount = value
}
func (l *logger) SetRotateByDay() {
l.dailyRolling = true
l.logSuffix = genDayTime(time.Now())
}
func (l *logger) SetRotateByHour() {
l.hourRolling = true
l.logSuffix = genHourTime(time.Now())
}
func (l *logger) rotate() error {
l.lock.Lock()
defer l.lock.Unlock()
var suffix string
if l.dailyRolling {
suffix = genDayTime(time.Now())
} else if l.hourRolling {
suffix = genHourTime(time.Now())
} else {
return nil
}
// Notice: if suffix is not equal to l.LogSuffix, then rotate
if suffix != l.logSuffix {
err := l.doRotate(suffix)
if err != nil {
return err
}
}
return nil
}
func (l *logger) doRotate(suffix string) error {
// Notice: Not check error, is this ok?
l.fd.Close()
lastFileName := l.fileName + "." + l.logSuffix
err := os.Rename(l.fileName, lastFileName)
if err != nil {
return err
}
err = l.SetOutputByName(l.fileName)
if err != nil {
return err
}
l.logSuffix = suffix
return l.removeLogs()
}
func (l *logger) removeLogs() error {
dir := path.Dir(l.fileName)
files, err := ioutil.ReadDir(dir)
if err != nil {
return err
}
var logFiles []os.FileInfo
for _, file := range files {
if strings.HasPrefix(file.Name(), l.fileName) {
logFiles = append(logFiles, file)
}
}
if l.logCount == 0 {
l.logCount = 10
}
n := len(logFiles) - l.logCount
if n <= 0 {
return nil
}
sort.Slice(logFiles, func(i, j int) bool {
return logFiles[i].ModTime().Before(logFiles[j].ModTime())
})
for i := 0; i < n; i++ {
err = os.Remove(path.Join(dir, logFiles[i].Name()))
if err != nil {
return err
}
}
return nil
}
func (l *logger) SetOutput(out io.Writer) {
l._log = log.New(out, l._log.Prefix(), l._log.Flags())
}
func (l *logger) SetOutputByName(path string) error {
f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666)
if err != nil {
log.Fatal(err)
}
l.SetOutput(f)
l.fileName = path
l.fd = f
return err
}
func (l *logger) log(t Type, v ...interface{}) {
l.logWithPrefix(t, "", v...)
}
func (l *logger) logWithPrefix(t Type, prefix string, v ...interface{}) {
if l.level|Level(t) != l.level {
return
}
err := l.rotate()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
v1 := make([]interface{}, len(v)+2)
logStr, logColor := logTypeToString(t)
if l.highlighting {
if prefix == "" {
v1[0] = "\033" + logColor + "m[" + logStr + "]"
} else {
v1[0] = "\033" + logColor + "m[" + logStr + "] " + prefix + ":"
}
copy(v1[1:], v)
v1[len(v)+1] = "\033[0m"
} else {
if prefix == "" {
v1[0] = "[" + logStr + "]"
} else {
v1[0] = "[" + logStr + "] " + prefix + ":"
}
copy(v1[1:], v)
v1[len(v)+1] = ""
}
s := fmt.Sprintln(v1...)
l._log.Output(4, s)
}
func (l *logger) logf(t Type, format string, v ...interface{}) {
l.logfWithPrefix(t, format, "", v...)
}
func (l *logger) logfWithPrefix(t Type, format string, prefix string, v ...interface{}) {
if l.level|Level(t) != l.level {
return
}
err := l.rotate()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
logStr, logColor := logTypeToString(t)
var s string
if l.highlighting {
if prefix == "" {
s = "\033" + logColor + "m[" + logStr + "] " + fmt.Sprintf(format, v...) + "\033[0m"
} else {
s = "\033" + logColor + "m[" + logStr + "] " + prefix + ": " + fmt.Sprintf(format, v...) + "\033[0m"
}
} else {
if prefix == "" {
s = "[" + logStr + "] " + fmt.Sprintf(format, v...)
} else {
s = "[" + logStr + "] " + prefix + ": " + fmt.Sprintf(format, v...)
}
}
l._log.Output(4, s)
}
// FatalEnabled fatal enabled
func (l *logger) FatalEnabled() bool {
return l.isLevelEnabled(fatalLevel)
}
// ErrorEnabled error enabled
func (l *logger) ErrorEnabled() bool {
return l.isLevelEnabled(errorLevel)
}
// WarnEnabled warn enabled
func (l *logger) WarnEnabled() bool {
return l.isLevelEnabled(warnLevel)
}
// InfoEnabled info enabled
func (l *logger) InfoEnabled() bool {
return l.isLevelEnabled(infoLevel)
}
// DebugEnabled debug enabled
func (l *logger) DebugEnabled() bool {
return l.isLevelEnabled(debugLevel)
}
func (l *logger) isLevelEnabled(target Type) bool {
return int(l.level)&int(target) != 0
}
func (l *logger) Fatal(v ...interface{}) {
l.log(fatalLevel, v...)
os.Exit(-1)
}
func (l *logger) Fatalf(format string, v ...interface{}) {
l.logf(fatalLevel, format, v...)
os.Exit(-1)
}
func (l *logger) Error(v ...interface{}) {
l.log(errorLevel, v...)
}
func (l *logger) Errorf(format string, v ...interface{}) {
l.logf(errorLevel, format, v...)
}
func (l *logger) Warning(v ...interface{}) {
l.log(warnLevel, v...)
}
func (l *logger) Warningf(format string, v ...interface{}) {
l.logf(warnLevel, format, v...)
}
func (l *logger) Debug(v ...interface{}) {
l.log(debugLevel, v...)
}
func (l *logger) Debugf(format string, v ...interface{}) {
l.logf(debugLevel, format, v...)
}
func (l *logger) Info(v ...interface{}) {
l.log(infoLevel, v...)
}
func (l *logger) Infof(format string, v ...interface{}) {
l.logf(infoLevel, format, v...)
}
func stringToLogLevel(level string) Level {
switch level {
case "fatal":
return LogFatal
case "error":
return LogError
case "warn":
return LogWarn
case "warning":
return LogWarn
case "debug":
return LogDebug
case "info":
return LogInfo
}
return LogAll
}
func logTypeToString(t Type) (string, string) {
switch t {
case fatalLevel:
return "fatal", "[0;31"
case errorLevel:
return "error", "[0;31"
case warnLevel:
return "warning", "[0;33"
case debugLevel:
return "debug", "[0;36"
case infoLevel:
return "info", "[0;37"
}
return "unknown", "[0;37"
}
func genDayTime(t time.Time) string {
return t.Format(formatTimeDay)
}
func genHourTime(t time.Time) string {
return t.Format(formatTimeHour)
}
func new() *logger {
return newLogger(os.Stderr, "")
}
func newLogger(w io.Writer, prefix string) *logger {
return &logger{_log: log.New(w, prefix, LstdFlags), level: LogAll, highlighting: true}
}