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logger.go
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logger.go
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package lager
import (
"fmt"
"runtime"
"sync/atomic"
"time"
)
const StackTraceBufferSize = 1024 * 100
type Logger interface {
RegisterSink(Sink)
Session(task string, data ...Data) Logger
SessionName() string
Debug(action string, data ...Data)
Info(action string, data ...Data)
Error(action string, err error, data ...Data)
Fatal(action string, err error, data ...Data)
WithData(Data) Logger
}
type logger struct {
component string
task string
sinks []Sink
sessionID string
nextSession uint32
data Data
}
func NewLogger(component string) Logger {
return &logger{
component: component,
task: component,
sinks: []Sink{},
data: Data{},
}
}
func (l *logger) RegisterSink(sink Sink) {
l.sinks = append(l.sinks, sink)
}
func (l *logger) SessionName() string {
return l.task
}
func (l *logger) Session(task string, data ...Data) Logger {
sid := atomic.AddUint32(&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...),
}
}
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),
}
}
func (l *logger) Debug(action string, data ...Data) {
t := time.Now().UTC()
log := LogFormat{
time: t,
Timestamp: formatTimestamp(t),
Source: l.component,
Message: fmt.Sprintf("%s.%s", l.task, action),
LogLevel: DEBUG,
Data: l.baseData(data...),
}
for _, sink := range l.sinks {
sink.Log(log)
}
}
func (l *logger) Info(action string, data ...Data) {
t := time.Now().UTC()
log := LogFormat{
time: t,
Timestamp: formatTimestamp(t),
Source: l.component,
Message: fmt.Sprintf("%s.%s", l.task, action),
LogLevel: INFO,
Data: l.baseData(data...),
}
for _, sink := range l.sinks {
sink.Log(log)
}
}
func (l *logger) Error(action string, err error, data ...Data) {
logData := l.baseData(data...)
if err != nil {
logData["error"] = err.Error()
}
t := time.Now().UTC()
log := LogFormat{
time: t,
Timestamp: formatTimestamp(t),
Source: l.component,
Message: fmt.Sprintf("%s.%s", l.task, action),
LogLevel: ERROR,
Data: logData,
Error: err,
}
for _, sink := range l.sinks {
sink.Log(log)
}
}
func (l *logger) Fatal(action string, err error, data ...Data) {
logData := l.baseData(data...)
stackTrace := make([]byte, StackTraceBufferSize)
stackSize := runtime.Stack(stackTrace, false)
stackTrace = stackTrace[:stackSize]
if err != nil {
logData["error"] = err.Error()
}
logData["trace"] = string(stackTrace)
t := time.Now().UTC()
log := LogFormat{
time: t,
Timestamp: formatTimestamp(t),
Source: l.component,
Message: fmt.Sprintf("%s.%s", l.task, action),
LogLevel: FATAL,
Data: logData,
Error: err,
}
for _, sink := range l.sinks {
sink.Log(log)
}
panic(err)
}
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 formatTimestamp(t time.Time) string {
return fmt.Sprintf("%.9f", float64(t.UnixNano())/1e9)
}