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logger.go
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logger.go
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package lager
import (
"fmt"
"runtime"
"strconv"
"strings"
"sync/atomic"
"time"
)
// StackTraceBufferSize is a constant which defines stack track buffer size
const StackTraceBufferSize = 1024 * 100
// Logger is a interface
type Logger interface {
RegisterSink(Sink)
Session(task string, data ...Data) Logger
SessionName() string
Debug(action string, data ...Data)
Info(action string, data ...Data)
Warn(action string, data ...Data)
Error(action string, err error, data ...Data)
Fatal(action string, err error, data ...Data)
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
Warnf(format string, args ...interface{})
Errorf(err error, format string, args ...interface{})
Fatalf(err error, format string, args ...interface{})
WithData(Data) Logger
}
type logger struct {
component string
task string
sinks []Sink
sessionID string
nextSession uint64
data Data
logFormatText bool
logHideLineno bool
}
// NewLoggerExt is a function which returns logger struct object
func NewLoggerExt(component string, isFormatText, isHideLineno bool) Logger {
return &logger{
component: component,
task: component,
sinks: []Sink{},
data: Data{},
logFormatText: isFormatText,
logHideLineno: isHideLineno,
}
}
// NewLogger is a function used to get new logger object
func NewLogger(component string) Logger {
return NewLoggerExt(component, true, false)
}
// RegisterSink is a function used to register sink
func (l *logger) RegisterSink(sink Sink) {
l.sinks = append(l.sinks, sink)
}
// SessionName is used to get the session name
func (l *logger) SessionName() string {
return l.task
}
// Session is a function which returns logger details for that session
func (l *logger) Session(task string, data ...Data) Logger {
sid := atomic.AddUint64(&l.nextSession, 1)
var sessionIDStr string
if l.sessionID != "" {
sessionIDStr = fmt.Sprintf("%s.%d", l.sessionID, sid)
} else {
sessionIDStr = fmt.Sprintf("%d", sid)
}
return &logger{
component: l.component,
task: fmt.Sprintf("%s.%s", l.task, task),
sinks: l.sinks,
sessionID: sessionIDStr,
data: l.baseData(data...),
}
}
// WithData which adds data to the logger object
func (l *logger) WithData(data Data) Logger {
return &logger{
component: l.component,
task: l.task,
sinks: l.sinks,
sessionID: l.sessionID,
data: l.baseData(data),
}
}
// Find the sink need to log
func (l *logger) activeSinks(loglevel LogLevel) []Sink {
ss := make([]Sink, len(l.sinks))
idx := 0
for _, itf := range l.sinks {
if s, ok := itf.(*writerSink); ok && loglevel < s.minLogLevel {
continue
}
if s, ok := itf.(*ReconfigurableSink); ok && loglevel < LogLevel(s.minLogLevel) {
continue
}
ss[idx] = itf
idx++
}
return ss[:idx]
}
func (l *logger) log(loglevel LogLevel, action string, err error, data ...Data) {
ss := l.activeSinks(loglevel)
if len(ss) == 0 {
return
}
l.logs(ss, loglevel, action, err, data...)
}
func (l *logger) logs(ss []Sink, loglevel LogLevel, action string, err error, data ...Data) {
logData := l.baseData(data...)
if err != nil {
logData["error"] = err.Error()
}
if loglevel == FATAL {
stackTrace := make([]byte, StackTraceBufferSize)
stackSize := runtime.Stack(stackTrace, false)
stackTrace = stackTrace[:stackSize]
logData["trace"] = string(stackTrace)
}
log := LogFormat{
Timestamp: currentTimestamp(),
Message: action,
LogLevel: loglevel,
Data: logData,
}
// add file, lineno
if !l.logHideLineno {
addExtLogInfo(&log)
}
var logInfo string
for _, sink := range l.sinks {
if l.logFormatText {
levelStr := FormatLogLevel(log.LogLevel)
extraData, ok := log.Data["error"].(string)
if ok && extraData != "" {
extraData = " error: " + extraData
}
var b strings.Builder
b.WriteString(log.Timestamp)
b.WriteString(" ")
b.WriteString(levelStr)
b.WriteString(" ")
b.WriteString(log.File)
b.WriteString(" ")
b.WriteString(log.Message)
if extraData != "" {
b.WriteString(extraData)
}
logInfo = b.String()
sink.Log(loglevel, []byte(logInfo))
} else {
logInfo, jsErr := log.ToJSON()
if jsErr != nil {
fmt.Printf("[lager] ToJSON() ERROR! action: %s, jserr: %s, log: %+v", action, jsErr, log)
// also output json marshal error event to sink
log.Data = Data{"Data": fmt.Sprint(logData)}
jsonErrData, _ := log.ToJSON()
sink.Log(ERROR, jsonErrData)
continue
}
sink.Log(loglevel, logInfo)
}
}
if loglevel == FATAL {
panic(err)
}
}
func (l *logger) Debug(action string, data ...Data) {
l.log(DEBUG, action, nil, data...)
}
func (l *logger) Info(action string, data ...Data) {
l.log(INFO, action, nil, data...)
}
func (l *logger) Warn(action string, data ...Data) {
l.log(WARN, action, nil, data...)
}
func (l *logger) Error(action string, err error, data ...Data) {
l.log(ERROR, action, err, data...)
}
func (l *logger) Fatal(action string, err error, data ...Data) {
l.log(FATAL, action, err, data...)
}
func (l *logger) logf(loglevel LogLevel, err error, format string, args ...interface{}) {
ss := l.activeSinks(loglevel)
if len(ss) == 0 {
return
}
logmsg := fmt.Sprintf(format, args...)
l.logs(ss, loglevel, logmsg, err)
}
func (l *logger) Debugf(format string, args ...interface{}) {
l.logf(DEBUG, nil, format, args...)
}
func (l *logger) Infof(format string, args ...interface{}) {
l.logf(INFO, nil, format, args...)
}
func (l *logger) Warnf(format string, args ...interface{}) {
l.logf(WARN, nil, format, args...)
}
func (l *logger) Errorf(err error, format string, args ...interface{}) {
l.logf(ERROR, err, format, args...)
}
func (l *logger) Fatalf(err error, format string, args ...interface{}) {
l.logf(FATAL, err, format, args...)
}
func (l *logger) baseData(givenData ...Data) Data {
data := Data{}
for k, v := range l.data {
data[k] = v
}
if len(givenData) > 0 {
for _, dataArg := range givenData {
for key, val := range dataArg {
data[key] = val
}
}
}
if l.sessionID != "" {
data["session"] = l.sessionID
}
return data
}
func currentTimestamp() string {
//return time.Now().Format("2006-01-02 15:04:05.000 -07:00")
return time.Now().Format("2006-01-02 15:04:05.000")
}
func addExtLogInfo(logf *LogFormat) {
for i := 4; i <= 5; i++ {
_, file, line, ok := runtime.Caller(i)
if strings.Index(file, "st_lager.go") > 0 {
continue
}
if ok {
idx := strings.LastIndex(file, "src")
switch {
case idx >= 0:
logf.File = file[idx+4:]
default:
logf.File = file
}
// depth: 2
indexFunc := func(file string) string {
backup := "/" + file
lastSlashIndex := strings.LastIndex(backup, "/")
if lastSlashIndex < 0 {
return backup
}
secondLastSlashIndex := strings.LastIndex(backup[:lastSlashIndex], "/")
if secondLastSlashIndex < 0 {
return backup[lastSlashIndex+1:]
}
return backup[secondLastSlashIndex+1:]
}
logf.File = indexFunc(logf.File) + ":" + strconv.Itoa(line)
}
break
}
}