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