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// Copyright (c) 2023 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 exzerolog
import (
"bytes"
"sync"
"github.com/rs/zerolog"
)
// LogWriter wraps a zerolog.Logger and provides an io.Writer with buffering so each written line is logged separately.
type LogWriter struct {
log zerolog.Logger
level zerolog.Level
field string
mu sync.Mutex
buf bytes.Buffer
}
func NewLogWriter(log zerolog.Logger) *LogWriter {
zerolog.Nop()
return &LogWriter{
log: log,
level: zerolog.DebugLevel,
field: zerolog.MessageFieldName,
}
}
func (lw *LogWriter) WithLevel(level zerolog.Level) *LogWriter {
return &LogWriter{
log: lw.log,
level: level,
field: lw.field,
}
}
func (lw *LogWriter) WithField(field string) *LogWriter {
return &LogWriter{
log: lw.log,
level: lw.level,
field: field,
}
}
func (lw *LogWriter) writeLine(data []byte) {
if len(data) == 0 {
return
}
if data[len(data)-1] == '\n' {
data = data[:len(data)-1]
}
if lw.buf.Len() > 0 {
lw.buf.Write(data)
data = lw.buf.Bytes()
lw.buf.Reset()
}
lw.log.WithLevel(lw.level).Bytes(lw.field, data).Send()
}
func (lw *LogWriter) Write(data []byte) (n int, err error) {
lw.mu.Lock()
defer lw.mu.Unlock()
newline := bytes.IndexByte(data, '\n')
if newline == len(data)-1 {
lw.writeLine(data)
} 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])
}
return len(data), nil
}
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