127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
// Copyright (C) 2010, Kyle Lemons <kyle@kylelemons.net>. All rights reserved.
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package log4go
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import (
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"bytes"
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"fmt"
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"io"
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"strings"
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)
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const (
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FORMAT_DEFAULT = "[%D %T] [%L] (%S) %M"
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FORMAT_SHORT = "[%t %d] [%L] %M"
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FORMAT_ABBREV = "[%L] %M"
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)
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type formatCacheType struct {
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LastUpdateSeconds int64
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shortTime, shortDate string
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longTime, longDate string
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}
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var formatCache = &formatCacheType{}
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// Known format codes:
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// %T - Time (15:04:05 MST)
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// %t - Time (15:04)
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// %D - Date (2006/01/02)
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// %d - Date (01/02/06)
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// %L - Level (FNST, FINE, DEBG, TRAC, WARN, EROR, CRIT)
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// %S - Source
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// %M - Message
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// Ignores unknown formats
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// Recommended: "[%D %T] [%L] (%S) %M"
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func FormatLogRecord(format string, rec *LogRecord) string {
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if rec == nil {
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return "<nil>"
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}
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if len(format) == 0 {
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return ""
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}
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out := bytes.NewBuffer(make([]byte, 0, 64))
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secs := rec.Created.UnixNano() / 1e9
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cache := *formatCache
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if cache.LastUpdateSeconds != secs {
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month, day, year := rec.Created.Month(), rec.Created.Day(), rec.Created.Year()
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hour, minute, second := rec.Created.Hour(), rec.Created.Minute(), rec.Created.Second()
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zone, _ := rec.Created.Zone()
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updated := &formatCacheType{
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LastUpdateSeconds: secs,
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shortTime: fmt.Sprintf("%02d:%02d", hour, minute),
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shortDate: fmt.Sprintf("%02d/%02d/%02d", day, month, year%100),
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longTime: fmt.Sprintf("%02d:%02d:%02d %s", hour, minute, second, zone),
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longDate: fmt.Sprintf("%04d/%02d/%02d", year, month, day),
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}
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cache = *updated
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formatCache = updated
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}
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// Split the string into pieces by % signs
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pieces := bytes.Split([]byte(format), []byte{'%'})
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// Iterate over the pieces, replacing known formats
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for i, piece := range pieces {
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if i > 0 && len(piece) > 0 {
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switch piece[0] {
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case 'T':
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out.WriteString(cache.longTime)
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case 't':
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out.WriteString(cache.shortTime)
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case 'D':
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out.WriteString(cache.longDate)
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case 'd':
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out.WriteString(cache.shortDate)
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case 'L':
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out.WriteString(levelStrings[rec.Level])
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case 'S':
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out.WriteString(rec.Source)
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case 's':
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slice := strings.Split(rec.Source, "/")
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out.WriteString(slice[len(slice)-1])
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case 'M':
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out.WriteString(rec.Message)
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}
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if len(piece) > 1 {
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out.Write(piece[1:])
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}
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} else if len(piece) > 0 {
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out.Write(piece)
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}
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}
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out.WriteByte('\n')
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return out.String()
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}
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// This is the standard writer that prints to standard output.
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type FormatLogWriter chan *LogRecord
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// This creates a new FormatLogWriter
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func NewFormatLogWriter(out io.Writer, format string) FormatLogWriter {
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records := make(FormatLogWriter, LogBufferLength)
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go records.run(out, format)
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return records
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}
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func (w FormatLogWriter) run(out io.Writer, format string) {
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for rec := range w {
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fmt.Fprint(out, FormatLogRecord(format, rec))
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}
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}
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// This is the FormatLogWriter's output method. This will block if the output
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// buffer is full.
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func (w FormatLogWriter) LogWrite(rec *LogRecord) {
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w <- rec
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}
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// Close stops the logger from sending messages to standard output. Attempts to
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// send log messages to this logger after a Close have undefined behavior.
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func (w FormatLogWriter) Close() {
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close(w)
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}
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