ref: c011b4667f3e1e3c6ecea2fe8f251578884c53b6
dir: /common/loggers/loggers.go/
// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package loggers
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"regexp"
"runtime"
"time"
"github.com/gohugoio/hugo/common/terminal"
jww "github.com/spf13/jwalterweatherman"
)
var (
// Counts ERROR logs to the global jww logger.
GlobalErrorCounter *jww.Counter
)
func init() {
GlobalErrorCounter = &jww.Counter{}
jww.SetLogListeners(jww.LogCounter(GlobalErrorCounter, jww.LevelError))
}
func LoggerToWriterWithPrefix(logger *log.Logger, prefix string) io.Writer {
return prefixWriter{
logger: logger,
prefix: prefix,
}
}
type prefixWriter struct {
logger *log.Logger
prefix string
}
func (w prefixWriter) Write(p []byte) (n int, err error) {
w.logger.Printf("%s: %s", w.prefix, p)
return len(p), nil
}
// Logger wraps a *loggers.Logger and some other related logging state.
type Logger struct {
*jww.Notepad
// The writer that represents stdout.
// Will be ioutil.Discard when in quiet mode.
Out io.Writer
ErrorCounter *jww.Counter
WarnCounter *jww.Counter
// This is only set in server mode.
errors *bytes.Buffer
}
// PrintTimerIfDelayed prints a time statement to the FEEDBACK logger
// if considerable time is spent.
func (l *Logger) PrintTimerIfDelayed(start time.Time, name string) {
elapsed := time.Since(start)
milli := int(1000 * elapsed.Seconds())
if milli < 500 {
return
}
l.FEEDBACK.Printf("%s in %v ms", name, milli)
}
func (l *Logger) PrintTimer(start time.Time, name string) {
elapsed := time.Since(start)
milli := int(1000 * elapsed.Seconds())
l.FEEDBACK.Printf("%s in %v ms", name, milli)
}
func (l *Logger) Errors() string {
if l.errors == nil {
return ""
}
return ansiColorRe.ReplaceAllString(l.errors.String(), "")
}
// Reset resets the logger's internal state.
func (l *Logger) Reset() {
l.ErrorCounter.Reset()
if l.errors != nil {
l.errors.Reset()
}
}
// NewLogger creates a new Logger for the given thresholds
func NewLogger(stdoutThreshold, logThreshold jww.Threshold, outHandle, logHandle io.Writer, saveErrors bool) *Logger {
return newLogger(stdoutThreshold, logThreshold, outHandle, logHandle, saveErrors)
}
// NewDebugLogger is a convenience function to create a debug logger.
func NewDebugLogger() *Logger {
return NewBasicLogger(jww.LevelDebug)
}
// NewWarningLogger is a convenience function to create a warning logger.
func NewWarningLogger() *Logger {
return NewBasicLogger(jww.LevelWarn)
}
// NewInfoLogger is a convenience function to create a info logger.
func NewInfoLogger() *Logger {
return NewBasicLogger(jww.LevelInfo)
}
// NewErrorLogger is a convenience function to create an error logger.
func NewErrorLogger() *Logger {
return NewBasicLogger(jww.LevelError)
}
// NewBasicLogger creates a new basic logger writing to Stdout.
func NewBasicLogger(t jww.Threshold) *Logger {
return newLogger(t, jww.LevelError, os.Stdout, ioutil.Discard, false)
}
// NewBasicLoggerForWriter creates a new basic logger writing to w.
func NewBasicLoggerForWriter(t jww.Threshold, w io.Writer) *Logger {
return newLogger(t, jww.LevelError, w, ioutil.Discard, false)
}
var (
ansiColorRe = regexp.MustCompile("(?s)\\033\\[\\d*(;\\d*)*m")
errorRe = regexp.MustCompile("^(ERROR|FATAL|WARN)")
)
type ansiCleaner struct {
w io.Writer
}
func (a ansiCleaner) Write(p []byte) (n int, err error) {
return a.w.Write(ansiColorRe.ReplaceAll(p, []byte("")))
}
type labelColorizer struct {
w io.Writer
}
func (a labelColorizer) Write(p []byte) (n int, err error) {
replaced := errorRe.ReplaceAllStringFunc(string(p), func(m string) string {
switch m {
case "ERROR", "FATAL":
return terminal.Error(m)
case "WARN":
return terminal.Warning(m)
default:
return m
}
})
// io.MultiWriter will abort if we return a bigger write count than input
// bytes, so we lie a little.
_, err = a.w.Write([]byte(replaced))
return len(p), err
}
// InitGlobalLogger initializes the global logger, used in some rare cases.
func InitGlobalLogger(stdoutThreshold, logThreshold jww.Threshold, outHandle, logHandle io.Writer) {
outHandle, logHandle = getLogWriters(outHandle, logHandle)
jww.SetStdoutOutput(outHandle)
jww.SetLogOutput(logHandle)
jww.SetLogThreshold(logThreshold)
jww.SetStdoutThreshold(stdoutThreshold)
}
func getLogWriters(outHandle, logHandle io.Writer) (io.Writer, io.Writer) {
isTerm := terminal.IsTerminal(os.Stdout)
if logHandle != ioutil.Discard && isTerm {
// Remove any Ansi coloring from log output
logHandle = ansiCleaner{w: logHandle}
}
if isTerm {
outHandle = labelColorizer{w: outHandle}
}
return outHandle, logHandle
}
type fatalLogWriter int
func (s fatalLogWriter) Write(p []byte) (n int, err error) {
trace := make([]byte, 1500)
runtime.Stack(trace, true)
fmt.Printf("\n===========\n\n%s\n", trace)
os.Exit(-1)
return 0, nil
}
var fatalLogListener = func(t jww.Threshold) io.Writer {
if t != jww.LevelError {
// Only interested in ERROR
return nil
}
return new(fatalLogWriter)
}
func newLogger(stdoutThreshold, logThreshold jww.Threshold, outHandle, logHandle io.Writer, saveErrors bool) *Logger {
errorCounter := &jww.Counter{}
warnCounter := &jww.Counter{}
outHandle, logHandle = getLogWriters(outHandle, logHandle)
listeners := []jww.LogListener{jww.LogCounter(errorCounter, jww.LevelError), jww.LogCounter(warnCounter, jww.LevelWarn)}
var errorBuff *bytes.Buffer
if saveErrors {
errorBuff = new(bytes.Buffer)
errorCapture := func(t jww.Threshold) io.Writer {
if t != jww.LevelError {
// Only interested in ERROR
return nil
}
return errorBuff
}
listeners = append(listeners, errorCapture)
}
return &Logger{
Notepad: jww.NewNotepad(stdoutThreshold, logThreshold, outHandle, logHandle, "", log.Ldate|log.Ltime, listeners...),
Out: outHandle,
ErrorCounter: errorCounter,
WarnCounter: warnCounter,
errors: errorBuff,
}
}