79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
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// mauLogger - A logger for Go programs
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// Copyright (c) 2021 Tulir Asokan
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package maulogger
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import (
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"bytes"
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"io"
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"sync"
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)
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// LogWriter is a buffered io.Writer that writes lines to a Logger.
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type LogWriter struct {
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log Logger
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lock sync.Mutex
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level Level
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buf bytes.Buffer
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}
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func (log *BasicLogger) Writer(level Level) io.WriteCloser {
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return &LogWriter{
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log: log,
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level: level,
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}
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}
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func (log *Sublogger) Writer(level Level) io.WriteCloser {
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return &LogWriter{
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log: log,
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level: level,
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}
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}
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func (lw *LogWriter) writeLine(data []byte) {
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if lw.buf.Len() == 0 {
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if len(data) == 0 {
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return
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}
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lw.log.Logln(lw.level, string(data))
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} else {
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lw.buf.Write(data)
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lw.log.Logln(lw.level, lw.buf.String())
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lw.buf.Reset()
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}
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}
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// Write will write lines from the given data to the buffer. If the data doesn't end with a line break,
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// everything after the last line break will be buffered until the next Write or Close call.
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func (lw *LogWriter) Write(data []byte) (int, error) {
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lw.lock.Lock()
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newline := bytes.IndexByte(data, '\n')
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if newline == len(data)-1 {
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lw.writeLine(data[:len(data)-1])
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} else if newline < 0 {
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lw.buf.Write(data)
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} else {
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lines := bytes.Split(data, []byte("\n"))
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for _, line := range lines[:len(lines)-1] {
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lw.writeLine(line)
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}
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lw.buf.Write(lines[len(lines)-1])
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}
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lw.lock.Unlock()
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return len(data), nil
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}
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// Close will flush remaining data in the buffer into the logger.
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func (lw *LogWriter) Close() error {
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lw.lock.Lock()
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lw.log.Logln(lw.level, lw.buf.String())
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lw.buf.Reset()
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lw.lock.Unlock()
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return nil
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}
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