diff options
Diffstat (limited to 'common/loggers/loggers.go')
-rw-r--r-- | common/loggers/loggers.go | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/common/loggers/loggers.go b/common/loggers/loggers.go new file mode 100644 index 000000000..e711de468 --- /dev/null +++ b/common/loggers/loggers.go @@ -0,0 +1,173 @@ +// 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" + "io" + "io/ioutil" + "log" + "os" + "regexp" + + "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)) +} + +// Logger wraps a *loggers.Logger and some other related logging state. +type Logger struct { + *jww.Notepad + ErrorCounter *jww.Counter + + // This is only set in server mode. + errors *bytes.Buffer +} + +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) +} + +// NewErrorLogger is a convenience function to create an error logger. +func NewErrorLogger() *Logger { + return newBasicLogger(jww.LevelError) +} + +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 + +} + +func newLogger(stdoutThreshold, logThreshold jww.Threshold, outHandle, logHandle io.Writer, saveErrors bool) *Logger { + errorCounter := &jww.Counter{} + outHandle, logHandle = getLogWriters(outHandle, logHandle) + + listeners := []jww.LogListener{jww.LogCounter(errorCounter, jww.LevelError)} + 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...), + ErrorCounter: errorCounter, + errors: errorBuff, + } +} + +func newBasicLogger(t jww.Threshold) *Logger { + return newLogger(t, jww.LevelError, os.Stdout, ioutil.Discard, false) +} |