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logger.go
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logger.go
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package zlog
import (
"fmt"
"io"
"os"
"sync"
"time"
)
type Logger struct {
mu sync.Mutex
out io.Writer
prefix string
// Color handling
useColor bool
currentColor color
}
type LogLevel uint8
type color []byte
const (
prefixFormat = "%s [%s] %s: "
)
const (
LOG_FATAL LogLevel = iota
LOG_ERROR LogLevel = iota
LOG_WARN LogLevel = iota
LOG_INFO LogLevel = iota
LOG_DEBUG LogLevel = iota
LOG_TRACE LogLevel = iota
)
const (
colorRed = "\x1b[31m"
colorGreen = "\x1b[32m"
colorYellow = "\x1b[33m"
colorBlue = "\x1b[34m"
colorMagenta = "\x1b[35m"
colorCyan = "\x1b[36m"
colorReset = "\033[0m"
)
var (
red color = []byte(colorRed)
green color = []byte(colorGreen)
yellow color = []byte(colorYellow)
blue color = []byte(colorBlue)
magenta color = []byte(colorMagenta)
cyan color = []byte(colorCyan)
reset color = []byte(colorReset)
)
var (
levelNames = []string{"FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE"}
colors = []color{red, magenta, yellow, green, blue, reset, reset}
)
var (
defaultLogger = New(os.Stderr, "log")
)
func (level LogLevel) String() string {
if level > LOG_TRACE {
level = LOG_TRACE
}
return levelNames[level]
}
func (level LogLevel) Color() color {
if level > LOG_TRACE {
level = LOG_TRACE
}
return colors[level]
}
func New(out io.Writer, prefix string) *Logger {
useColor := false
file, ok := out.(*os.File)
if ok {
stats, _ := file.Stat()
// Check to see if output is a terminal
if (stats.Mode() & os.ModeCharDevice) != 0 {
useColor = true
}
}
logger := Logger{
out: out,
prefix: prefix,
useColor: useColor,
}
return &logger
}
func (logger *Logger) Fatal(v ...interface{}) {
logger.doPrint(LOG_FATAL, v...)
os.Exit(1)
}
func (logger *Logger) Fatalf(format string, v ...interface{}) {
logger.doPrintf(LOG_FATAL, format, v...)
os.Exit(1)
}
func (logger *Logger) Error(v ...interface{}) {
logger.doPrint(LOG_ERROR, v...)
}
func (logger *Logger) Errorf(format string, v ...interface{}) {
logger.doPrintf(LOG_ERROR, format, v...)
}
func (logger *Logger) Warn(v ...interface{}) {
logger.doPrint(LOG_WARN, v...)
}
func (logger *Logger) Warnf(format string, v ...interface{}) {
logger.doPrintf(LOG_WARN, format, v...)
}
func (logger *Logger) Info(v ...interface{}) {
logger.doPrint(LOG_INFO, v...)
}
func (logger *Logger) Infof(format string, v ...interface{}) {
logger.doPrintf(LOG_INFO, format, v...)
}
func (logger *Logger) Debug(v ...interface{}) {
logger.doPrint(LOG_DEBUG, v...)
}
func (logger *Logger) Debugf(format string, v ...interface{}) {
logger.doPrintf(LOG_DEBUG, format, v...)
}
func (logger *Logger) Trace(v ...interface{}) {
logger.doPrint(LOG_TRACE, v...)
}
func (logger *Logger) Tracef(format string, v ...interface{}) {
logger.doPrintf(LOG_TRACE, format, v...)
}
func Fatal(v ...interface{}) {
defaultLogger.Fatal(v...)
}
func Fatalf(format string, v ...interface{}) {
defaultLogger.Fatalf(format, v...)
}
func Error(v ...interface{}) {
defaultLogger.Error(v...)
}
func Errorf(format string, v ...interface{}) {
defaultLogger.Errorf(format, v...)
}
func Warn(v ...interface{}) {
defaultLogger.Warn(v...)
}
func Warnf(format string, v ...interface{}) {
defaultLogger.Warnf(format, v...)
}
func Debug(v ...interface{}) {
defaultLogger.Debug(v...)
}
func Debugf(format string, v ...interface{}) {
defaultLogger.Debugf(format, v...)
}
func Info(v ...interface{}) {
defaultLogger.Info(v...)
}
func Infof(format string, v ...interface{}) {
defaultLogger.Infof(format, v...)
}
func Trace(v ...interface{}) {
defaultLogger.Trace(v...)
}
func Tracef(format string, v ...interface{}) {
defaultLogger.Tracef(format, v...)
}
func (logger *Logger) Print(level LogLevel, v ...interface{}) {
if level > LOG_TRACE {
level = LOG_TRACE
}
logger.doPrint(level, v...)
if level == LOG_FATAL {
os.Exit(1)
}
}
func (logger *Logger) Printf(level LogLevel, format string, v ...interface{}) {
if level > LOG_TRACE {
level = LOG_TRACE
}
logger.doPrintf(level, format, v...)
if level == LOG_FATAL {
os.Exit(1)
}
}
func Print(level LogLevel, v ...interface{}) {
defaultLogger.Print(level, v...)
}
func Printf(level LogLevel, format string, v ...interface{}) {
defaultLogger.Printf(level, format, v...)
}
func (logger *Logger) setColor(c color) {
logger.currentColor = c
}
func (logger *Logger) clearColor() {
logger.currentColor = reset
}
func (logger *Logger) doPrint(level LogLevel, v ...interface{}) {
timestamp := time.Now().Format(time.StampMilli)
logger.mu.Lock()
defer logger.mu.Unlock()
// Handle color output
if logger.useColor {
logger.out.Write(colors[level])
defer logger.out.Write(reset)
}
// Write the line out
fmt.Fprintf(logger.out, prefixFormat, timestamp, level.String(), logger.prefix)
fmt.Fprint(logger.out, v...)
logger.out.Write([]byte{'\n'})
}
func (logger *Logger) doPrintf(level LogLevel, format string, v ...interface{}) {
timestamp := time.Now().Format(time.StampMilli)
logger.mu.Lock()
defer logger.mu.Unlock()
// Handle color
if logger.useColor {
logger.out.Write(colors[level])
defer logger.out.Write(reset)
}
// Write the line out
fmt.Fprintf(logger.out, prefixFormat, timestamp, level.String(), logger.prefix)
fmt.Fprintf(logger.out, format, v...)
logger.out.Write([]byte{'\n'})
}