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logger.go
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logger.go
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// Package logger provides a simple logging package.
package logger
import (
"fmt"
"io"
"log"
"os"
"runtime"
"strings"
"time"
"github.com/fatih/color"
logging "github.com/ipfs/go-log/v2"
)
const (
LEVEL_NOSET = iota
LEVEL_DEBUG
LEVEL_INFO
LEVEL_WARNING
LEVEL_ERROR
LEVEL_FATAL
LEVEL_SUCCESS
)
// This is the set of emoji definition.
const (
FatalEmoji = "☠️"
DebugEmoji = "🐞"
InfoEmoji = "🦋"
SuccessEmoji = "🎉"
ErrorEmoji = "💔"
WarningEmoji = "⚠️"
)
// It contains configuration of logger.
var (
// Level defines the level of the logger. It's a global option and affects
Level = LEVEL_NOSET
FilelineFlag = false
//TimeStamps defines if the output has timestamps or not. It's a global option and affects all methods.
TimeStamps = true
// Color defines if the output has color or not. It's a global option and affects all methods.
Color = true
// BackgroundColor defines if the output has background color or not. It's a global option and affects all methods.
BackgroundColor = false
)
// Debug formats according to a format specifier and writes to standard output.
func Debug(format string, a ...interface{}) {
if Level <= LEVEL_DEBUG {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, DebugEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiBlue)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiBlue).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Info formats according to a format specifier and writes to standard output.
func Info(format string, a ...interface{}) {
if Level <= LEVEL_INFO {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, InfoEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiCyan)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiCyan).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Success formats according to a format specifier and writes to standard output.
func Success(format string, a ...interface{}) {
if Level <= LEVEL_SUCCESS {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, SuccessEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiGreen)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiGreen).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Warning formats according to a format specifier and writes to standard output.
func Warning(format string, a ...interface{}) {
if Level <= LEVEL_WARNING {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, WarningEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiYellow)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiYellow).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Error formats according to a format specifier and writes to standard output.
func Error(format string, a ...interface{}) {
if Level <= LEVEL_ERROR {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, ErrorEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiRed)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiRed).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Fatal formats according to a format specifier and writes to standard output.
func Fatal(format string, a ...interface{}) {
if Level <= LEVEL_FATAL {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, FatalEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgRed)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgWhite)
c.EnableColor()
s = c.Add(color.BgHiRed).Sprintf(s)
}
prefix := generateLogPrefix(FilelineFlag, 2)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
type CompatLogger struct {
PrefixLevel int
Level int
FilelineFlag bool
}
func (l *CompatLogger) Infof(format string, a ...interface{}) {
if l.Level <= LEVEL_INFO {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, InfoEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiCyan)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiCyan).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Debug formats according to a format specifier and writes to standard output.
func (l *CompatLogger) Debugf(format string, a ...interface{}) {
if l.Level <= LEVEL_DEBUG {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, DebugEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiBlue)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiBlue).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Success formats according to a format specifier and writes to standard output.
func (l *CompatLogger) Successf(format string, a ...interface{}) {
if l.Level <= LEVEL_SUCCESS {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, SuccessEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiGreen)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiGreen).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Warning formats according to a format specifier and writes to standard output.
func (l *CompatLogger) Warningf(format string, a ...interface{}) {
if l.Level <= LEVEL_WARNING {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, WarningEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiYellow)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiYellow).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Error formats according to a format specifier and writes to standard output.
func (l *CompatLogger) Errorf(format string, a ...interface{}) {
if l.Level <= LEVEL_ERROR {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, ErrorEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgHiRed)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgHiRed).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
// Fatal formats according to a format specifier and writes to standard output.
func (l *CompatLogger) Fatalf(format string, a ...interface{}) {
if l.Level <= LEVEL_FATAL {
a, w := extractLoggerArguments(format, a...)
s := fmt.Sprintf(emojiLabel(format, FatalEmoji), a...)
if Color && BackgroundColor {
Color = false
}
if Color {
c := color.New(color.FgRed)
c.EnableColor()
s = c.Sprintf(s)
}
if BackgroundColor {
c := color.New(color.FgHiWhite)
c.EnableColor()
s = c.Add(color.BgRed).Sprintf(s)
}
prefixLevel := 3
if l.PrefixLevel > 0 {
prefixLevel = l.PrefixLevel
}
prefix := generateLogPrefix(l.FilelineFlag, prefixLevel)
content := fmt.Sprintf("%s %s", prefix, s)
fmt.Fprint(w, content)
}
}
func extractLoggerArguments(format string, a ...interface{}) ([]interface{}, io.Writer) {
n := strings.Count(format, "%")
if n > len(a) {
n = len(a)
}
var w io.Writer = os.Stdout
if length := n; length > 0 {
// extract an io.Writer at the end of a
if value, ok := a[length-1].(io.Writer); ok {
w = value
a = a[0 : length-1]
}
}
return a, w
}
func emojiLabel(format, label string) string {
if !strings.Contains(format, "\n") {
format = fmt.Sprintf("%s%s", format, "\n")
}
return fmt.Sprintf("%s-%s", label, format)
}
// generateLogPrefix generates a log prefix based on the current time and the file and line number
func generateLogPrefix(filelineFlag bool, prefixLevel int) string {
filelinePrefix := ""
if filelineFlag {
// add file and line number
_, file, line, ok := runtime.Caller(prefixLevel)
if ok {
//get short file name
// file = filepath.Base(file)
filelinePrefix = fmt.Sprintf("%s:%d", file, line)
}
}
if TimeStamps {
t := time.Now()
rfcTime := t.Format(time.RFC3339)
return fmt.Sprintf("%s %s", rfcTime, filelinePrefix)
} else {
return filelinePrefix
}
}
// InitLogger initializes the logger
func InitAndCloseOther() {
c := logging.Config{
Format: logging.ColorizedOutput,
Stdout: false,
Stderr: true,
Level: logging.LevelError,
}
logging.SetupLogging(c)
logging.SetLogLevel("*", "ERROR")
os.Stderr = nil
log.SetOutput(io.Discard)
Level = LEVEL_INFO
}