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