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logger.go
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logger.go
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package miso
import (
"bytes"
"context"
"fmt"
"runtime"
"strings"
"sync"
"github.com/natefinch/lumberjack"
"github.com/sirupsen/logrus"
)
const (
callerField = "caller"
)
type CTFormatter struct {
}
func init() {
logrus.SetReportCaller(false) // it's now set manually using Rail
// for convenience
logrus.SetFormatter(CustomFormatter())
}
const (
traceSpanIdWidth = 16
fnWidth = 30
levelWidth = 5
)
var (
logBufPool = sync.Pool{
New: func() any {
return &bytes.Buffer{}
},
}
)
func (c *CTFormatter) Format(entry *logrus.Entry) ([]byte, error) {
var fn string
caller, ok := entry.Data[callerField]
if ok {
fn = " " + caller.(string)
}
var traceId string
var spanId string
fields := entry.Data
if fields != nil {
if v, ok := fields[XTraceId].(string); ok {
traceId = v
}
if v, ok := fields[XSpanId].(string); ok {
spanId = v
}
}
levelstr := toLevelStr(entry.Level)
// s := fmt.Sprintf("%s %-5s [%-16v,%-16v]%-30s : %s\n", entry.Time.Format("2006-01-02 15:04:05.000"), levelstr, traceId, spanId, fn, entry.Message)
// return UnsafeStr2Byt(s), nil
b := logBufPool.Get().(*bytes.Buffer)
defer putLogBuf(b)
b.WriteString(entry.Time.Format("2006-01-02 15:04:05.000"))
b.WriteByte(' ')
b.WriteString(levelstr)
if len(levelstr) < levelWidth {
b.WriteString(Spaces(levelWidth - len(levelstr)))
}
b.WriteString(" [")
b.WriteString(traceId)
if len(traceId) < traceSpanIdWidth {
b.WriteString(Spaces(traceSpanIdWidth - len(traceId)))
}
b.WriteByte(',')
b.WriteString(spanId)
if len(spanId) < traceSpanIdWidth {
b.WriteString(Spaces(traceSpanIdWidth - len(spanId)))
}
b.WriteString("] ")
b.WriteString(fn)
if len(fn) < fnWidth {
b.WriteString(Spaces(fnWidth - len(fn)))
}
b.WriteString(" : ")
b.WriteString(entry.Message)
b.WriteByte('\n')
return b.Bytes(), nil
}
func putLogBuf(b *bytes.Buffer) {
b.Reset()
logBufPool.Put(b)
}
type NewRollingLogFileParam struct {
Filename string // filename
MaxSize int // max file size in mb
MaxAge int // max age in day
MaxBackups int // max number of files
}
// Create rolling file based logger
func BuildRollingLogFileWriter(p NewRollingLogFileParam) *lumberjack.Logger {
return &lumberjack.Logger{
Filename: p.Filename,
MaxSize: p.MaxSize, // megabytes
MaxAge: p.MaxAge, // days
MaxBackups: p.MaxBackups, // num of files
LocalTime: true,
Compress: false,
}
}
func toLevelStr(level logrus.Level) string {
switch level {
case logrus.TraceLevel:
return "TRACE"
case logrus.DebugLevel:
return "DEBUG"
case logrus.InfoLevel:
return "INFO"
case logrus.WarnLevel:
return "WARN"
case logrus.ErrorLevel:
return "ERROR"
case logrus.FatalLevel:
return "FATAL"
case logrus.PanicLevel:
return "PANIC"
}
return "UNKNOWN"
}
// Get custom formatter logrus
func CustomFormatter() logrus.Formatter {
return &CTFormatter{}
}
// Get pre-configured TextFormatter for logrus
func PreConfiguredFormatter() logrus.Formatter {
return &logrus.TextFormatter{
FullTimestamp: true,
}
}
// Return logger with tracing infomation
func TraceLogger(ctx context.Context) *logrus.Entry {
return logrus.WithFields(logrus.Fields{XSpanId: ctx.Value(XSpanId), XTraceId: ctx.Value(XTraceId)})
}
// Check whether current log level is DEBUG
func IsDebugLevel() bool {
return logrus.GetLevel() == logrus.DebugLevel
}
// Parse log level
func ParseLogLevel(logLevel string) (logrus.Level, bool) {
logLevel = strings.ToUpper(logLevel)
switch logLevel {
case "INFO":
return logrus.InfoLevel, true
case "DEBUG":
return logrus.DebugLevel, true
case "WARN":
return logrus.WarnLevel, true
case "ERROR":
return logrus.ErrorLevel, true
case "TRACE":
return logrus.TraceLevel, true
case "FATAL":
return logrus.FatalLevel, true
case "PANIC":
return logrus.PanicLevel, true
}
return logrus.InfoLevel, false
}
func Tracef(format string, args ...interface{}) {
logrus.WithField(callerField, getCallerFn()).Tracef(format, args...)
}
func Debugf(format string, args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.DebugLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Debugf(format, args...)
}
func Infof(format string, args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.InfoLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Infof(format, args...)
}
func Warnf(format string, args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.WarnLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Warnf(format, args...)
}
func Errorf(format string, args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.ErrorLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Errorf(format, args...)
}
func Fatalf(format string, args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.FatalLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Fatalf(format, args...)
}
func Debug(args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.DebugLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Debug(args...)
}
func Info(args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.InfoLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Info(args...)
}
func Warn(args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.WarnLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Warn(args...)
}
func Error(args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.ErrorLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Error(args...)
}
func Fatal(args ...interface{}) {
if !logrus.IsLevelEnabled(logrus.FatalLevel) {
return
}
logrus.WithField(callerField, getCallerFn()).Fatal(args...)
}
func SetLogLevel(level string) {
ll, ok := ParseLogLevel(level)
if !ok {
return
}
logrus.SetLevel(ll)
}
// reduce alloc, logger calls getCallerFn very frequently, we have to optimize it as much as possible.
var callerUintptrPool = sync.Pool{
New: func() any {
p := make([]uintptr, 4)
return &p
},
}
func getCallerFn() string {
pcs := callerUintptrPool.Get().(*[]uintptr)
defer putCallerUintptrPool(pcs)
depth := runtime.Callers(3, *pcs)
frames := runtime.CallersFrames((*pcs)[:depth])
// we only need the first frame
for f, next := frames.Next(); next; {
return unsafeGetShortFnName(f.Function)
}
return ""
}
func putCallerUintptrPool(pcs *[]uintptr) {
for i := range *pcs {
(*pcs)[i] = 0 // zero the values, just in case
}
callerUintptrPool.Put(pcs)
}
// func getCaller(level int) *runtime.Frame {
// pcs := make([]uintptr, level+1) // we only need the first frame
// depth := runtime.Callers(level, pcs)
// frames := runtime.CallersFrames(pcs[:depth])
// for f, next := frames.Next(); next; {
// return &f //nolint:scopelint
// }
// return nil
// }
func getShortFnName(fn string) string {
j := strings.LastIndex(fn, "/")
if j < 0 {
return fn
}
return string([]rune(fn)[j+1:])
}
func unsafeGetShortFnName(fn string) string {
j := strings.LastIndexByte(fn, '/')
if j < 0 {
return fn
}
return UnsafeByt2Str(UnsafeStr2Byt(fn)[j+1:])
}
func Printlnf(pat string, args ...any) {
fmt.Printf(pat+"\n", args...)
}