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logger.go
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logger.go
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// Copyright (c) 2016 Ventu.io, Oleg Sklyar, contributors
// The use of this source code is governed by a MIT style license found in the LICENSE file
package slog
import (
"errors"
"fmt"
"github.com/KristinaEtc/slf"
stdlog "log"
"os"
"path"
"runtime"
"time"
)
const (
// TraceField defined the key for the field to store trace duration.
TraceField = "trace"
// CallerField defines the key for the caller information.
CallerField = "caller"
// ErrorField can be used by handlers to represent the error in the data field collection.
ErrorField = "error"
traceMessage = "trace"
)
var (
noop = &slf.Noop{}
epoch = time.Time{}
// ExitProcessor is executed on Log(LevelFatal) to terminate the application.
ExitProcessor = func(message string) {
os.Exit(1)
}
)
// rootLogger represents a root logger for a context, all other loggers in the same context
// (with different fields) contain this one to identify the log level and entry handlers.
type rootLogger struct {
minlevel slf.Level
factory *logFactory
caller slf.CallerInfo
}
// logger represents a logger in the context. It is created from the rootlogger by copying its
// fields. "Fields" access is not directly synchronised because fields are written on copy only,
// however it is synchronised indirectly to guarantee timestamp for tracing.
type logger struct {
*rootLogger
// not synced because ro outside of construction in with*
fields map[string]interface{}
caller slf.CallerInfo
err error
// not synced
lasttouch time.Time
lastlevel slf.Level
}
// WithField implements the Logger interface.
func (log *logger) WithField(key string, value interface{}) slf.StructuredLogger {
res := log.copy()
res.fields[key] = value
return res
}
// WithFields implements the Logger interface.
func (log *logger) WithFields(fields slf.Fields) slf.StructuredLogger {
res := log.copy()
for k, v := range fields {
res.fields[k] = v
}
return res
}
// WithCaller implements the Logger interface.
func (log *logger) WithCaller(caller slf.CallerInfo) slf.StructuredLogger {
res := log.copy()
res.caller = caller
return res
}
// WithError implements the Logger interface.
func (log *logger) WithError(err error) slf.Logger {
res := log.copy()
res.err = err
return res
}
// Log implements the Logger interface.
func (log *logger) Log(level slf.Level, message string) slf.Tracer {
return log.log(level, message)
}
// Trace implements the Logger interface.
func (log *logger) Trace(err *error) {
lasttouch := log.lasttouch
level := log.lastlevel
if lasttouch != epoch && level >= log.rootLogger.minlevel {
var entry *entry
if err != nil {
entry = log.entry(level, traceMessage, 2, *err)
} else {
entry = log.entry(level, traceMessage, 2, nil)
}
entry.fields[TraceField] = time.Now().Sub(lasttouch)
log.handleall(entry)
}
log.lasttouch = epoch
}
// Debug implements the Logger interface.
func (log *logger) Debug(message string) slf.Tracer {
return log.log(slf.LevelDebug, message)
}
// Debugf implements the Logger interface.
func (log *logger) Debugf(format string, args ...interface{}) slf.Tracer {
return log.logf(format, slf.LevelDebug, args...)
}
// Info implements the Logger interface.
func (log *logger) Info(message string) slf.Tracer {
return log.log(slf.LevelInfo, message)
}
// Infof implements the Logger interface.
func (log *logger) Infof(format string, args ...interface{}) slf.Tracer {
return log.logf(format, slf.LevelInfo, args...)
}
// Warn implements the Logger interface.
func (log *logger) Warn(message string) slf.Tracer {
return log.log(slf.LevelWarn, message)
}
// Warnf implements the Logger interface.
func (log *logger) Warnf(format string, args ...interface{}) slf.Tracer {
return log.logf(format, slf.LevelWarn, args...)
}
// Error implements the Logger interface.
func (log *logger) Error(message string) slf.Tracer {
return log.log(slf.LevelError, message)
}
// Errorf implements the Logger interface.
func (log *logger) Errorf(format string, args ...interface{}) slf.Tracer {
return log.logf(format, slf.LevelError, args...)
}
// Panic implements the Logger interface.
func (log *logger) Panic(message string) {
log.log(slf.LevelPanic, message)
}
// Panicf implements the Logger interface.
func (log *logger) Panicf(format string, args ...interface{}) {
log.logf(format, slf.LevelPanic, args...)
}
// Fatal implements the Logger interface.
func (log *logger) Fatal(message string) {
log.log(slf.LevelFatal, message)
}
// Fatalf implements the Logger interface.
func (log *logger) Fatalf(format string, args ...interface{}) {
log.logf(format, slf.LevelFatal, args...)
}
// Log implements the Logger interface.
func (log *logger) log(level slf.Level, message string) slf.Tracer {
if level < log.rootLogger.minlevel {
return noop
}
return log.checkedlog(level, message)
}
func (log *logger) logf(format string, level slf.Level, args ...interface{}) slf.Tracer {
if level < log.rootLogger.minlevel {
return noop
}
message := fmt.Sprintf(format, args...)
return log.checkedlog(level, message)
}
func (log *logger) checkedlog(level slf.Level, message string) slf.Tracer {
log.handleall(log.entry(level, message, 4, log.err))
log.lasttouch = time.Now()
log.lastlevel = level
if level == slf.LevelPanic {
panic(errors.New(message))
} else if level == slf.LevelFatal {
ExitProcessor(message)
}
return log
}
func (log *logger) copy() *logger {
res := &logger{
rootLogger: log.rootLogger,
fields: make(map[string]interface{}),
caller: log.caller,
}
for key, value := range log.fields {
res.fields[key] = value
}
return res
}
func (log *logger) entry(level slf.Level, message string, skip int, err error) *entry {
fields := make(map[string]interface{})
for key, value := range log.fields {
fields[key] = value
}
caller := log.caller
if caller < slf.CallerNone {
caller = log.rootLogger.caller
}
if caller == slf.CallerLong || caller == slf.CallerShort {
if _, file, line, ok := runtime.Caller(skip); ok {
if caller == slf.CallerShort {
file = path.Base(file)
}
fields[CallerField] = fmt.Sprintf("%s:%d", file, line)
}
}
return &entry{tm: time.Now(), level: level, message: message, err: err, fields: fields}
}
func (log *logger) handleall(entry *entry) {
f := log.rootLogger.factory
f.RLock()
handlers := make([]EntryHandler, len(f.handlers))
copy(handlers, f.handlers)
f.RUnlock()
for _, handler := range handlers {
if log.factory.concurrent {
go log.handleone(handler, entry)
} else {
log.handleone(handler, entry)
}
}
if log.factory.concurrent {
runtime.Gosched()
}
}
func (log *logger) handleone(h EntryHandler, e *entry) {
if err := h.Handle(e); err != nil {
// fall back to standard logging to output entry handler error
stdlog.Printf("log handler error: %v\n", err.Error())
}
}