Logger package for gitea repositories
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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package log
import (
"bytes"
"fmt"
"io"
"regexp"
"strings"
"sync"
)
type byteArrayWriter []byte
func (b *byteArrayWriter) Write(p []byte) (int, error) {
*b = append(*b, p...)
return len(p), nil
}
// WriterLogger represent a basic logger for Gitea
type WriterLogger struct {
out io.WriteCloser
mu sync.Mutex
Level Level `json:"level"`
StacktraceLevel Level `json:"stacktraceLevel"`
Flags Flags `json:"flags"`
Prefix string `json:"prefix"`
Colorize bool `json:"colorize"`
Expression string `json:"expression"`
regexp *regexp.Regexp
}
// NewWriterLogger creates a new WriterLogger from the provided WriteCloser.
// Optionally the level can be changed at the same time.
func (logger *WriterLogger) NewWriterLogger(out io.WriteCloser, level ...Level) {
logger.mu.Lock()
defer logger.mu.Unlock()
logger.out = out
switch logger.Flags {
case 0:
logger.Flags = LstdFlags
case -1:
logger.Flags = 0
}
if len(level) > 0 {
logger.Level = level[0]
}
logger.createExpression()
}
func (logger *WriterLogger) createExpression() {
if len(logger.Expression) > 0 {
var err error
logger.regexp, err = regexp.Compile(logger.Expression)
if err != nil {
logger.regexp = nil
}
}
}
// GetLevel returns the logging level for this logger
func (logger *WriterLogger) GetLevel() Level {
return logger.Level
}
// GetStacktraceLevel returns the stacktrace logging level for this logger
func (logger *WriterLogger) GetStacktraceLevel() Level {
return logger.StacktraceLevel
}
// Copy of cheap integer to fixed-width decimal to ascii from logger.
func itoa(buf *[]byte, i int, wid int) {
var logger [20]byte
bp := len(logger) - 1
for i >= 10 || wid > 1 {
wid--
q := i / 10
logger[bp] = byte('0' + i - q*10)
bp--
i = q
}
// i < 10
logger[bp] = byte('0' + i)
*buf = append(*buf, logger[bp:]...)
}
func (logger *WriterLogger) createMsg(buf *[]byte, event *Event) {
*buf = append(*buf, logger.Prefix...)
t := event.time
if logger.Flags&(Ldate|Ltime|Lmicroseconds) != 0 {
if logger.Colorize {
*buf = append(*buf, fgCyanBytes...)
}
if logger.Flags&LUTC != 0 {
t = t.UTC()
}
if logger.Flags&Ldate != 0 {
year, month, day := t.Date()
itoa(buf, year, 4)
*buf = append(*buf, '/')
itoa(buf, int(month), 2)
*buf = append(*buf, '/')
itoa(buf, day, 2)
*buf = append(*buf, ' ')
}
if logger.Flags&(Ltime|Lmicroseconds) != 0 {
hour, min, sec := t.Clock()
itoa(buf, hour, 2)
*buf = append(*buf, ':')
itoa(buf, min, 2)
*buf = append(*buf, ':')
itoa(buf, sec, 2)
if logger.Flags&Lmicroseconds != 0 {
*buf = append(*buf, '.')
itoa(buf, t.Nanosecond()/1e3, 6)
}
*buf = append(*buf, ' ')
}
if logger.Colorize {
*buf = append(*buf, resetBytes...)
}
}
if logger.Flags&(Lshortfile|Llongfile) != 0 {
if logger.Colorize {
*buf = append(*buf, fgGreenBytes...)
}
file := event.filename
if logger.Flags&Lmedfile == Lmedfile {
startIndex := len(file) - 20
if startIndex > 0 {
file = "..." + file[startIndex:]
}
} else if logger.Flags&Lshortfile != 0 {
startIndex := strings.LastIndexByte(file, '/')
if startIndex > 0 && startIndex < len(file) {
file = file[startIndex+1:]
}
}
*buf = append(*buf, file...)
*buf = append(*buf, ':')
itoa(buf, event.line, -1)
if logger.Flags&(Lfuncname|Lshortfuncname) != 0 {
*buf = append(*buf, ':')
} else {
if logger.Colorize {
*buf = append(*buf, resetBytes...)
}
*buf = append(*buf, ' ')
}
}
if logger.Flags&(Lfuncname|Lshortfuncname) != 0 {
if logger.Colorize {
*buf = append(*buf, fgGreenBytes...)
}
funcname := event.caller
if logger.Flags&Lshortfuncname != 0 {
lastIndex := strings.LastIndexByte(funcname, '.')
if lastIndex > 0 && len(funcname) > lastIndex+1 {
funcname = funcname[lastIndex+1:]
}
}
*buf = append(*buf, funcname...)
if logger.Colorize {
*buf = append(*buf, resetBytes...)
}
*buf = append(*buf, ' ')
}
if logger.Flags&(Llevel|Llevelinitial) != 0 {
level := strings.ToUpper(event.level.String())
if logger.Colorize {
*buf = append(*buf, levelToColor[event.level]...)
}
*buf = append(*buf, '[')
if logger.Flags&Llevelinitial != 0 {
*buf = append(*buf, level[0])
} else {
*buf = append(*buf, level...)
}
*buf = append(*buf, ']')
if logger.Colorize {
*buf = append(*buf, resetBytes...)
}
*buf = append(*buf, ' ')
}
var msg = []byte(event.msg)
if len(msg) > 0 && msg[len(msg)-1] == '\n' {
msg = msg[:len(msg)-1]
}
pawMode := allowColor
if !logger.Colorize {
pawMode = removeColor
}
baw := byteArrayWriter(*buf)
(&protectedANSIWriter{
w: &baw,
mode: pawMode,
}).Write(msg)
*buf = baw
if event.stacktrace != "" && logger.StacktraceLevel <= event.level {
lines := bytes.Split([]byte(event.stacktrace), []byte("\n"))
if len(lines) > 1 {
for _, line := range lines {
*buf = append(*buf, "\n\t"...)
*buf = append(*buf, line...)
}
}
*buf = append(*buf, '\n')
}
*buf = append(*buf, '\n')
}
// LogEvent logs the event to the internal writer
func (logger *WriterLogger) LogEvent(event *Event) error {
if logger.Level > event.level {
return nil
}
logger.mu.Lock()
defer logger.mu.Unlock()
if !logger.Match(event) {
return nil
}
var buf []byte
logger.createMsg(&buf, event)
_, err := logger.out.Write(buf)
return err
}
// Match checks if the given event matches the logger's regexp expression
func (logger *WriterLogger) Match(event *Event) bool {
if logger.regexp == nil {
return true
}
if logger.regexp.Match([]byte(fmt.Sprintf("%s:%d:%s", event.filename, event.line, event.caller))) {
return true
}
// Match on the non-colored msg - therefore strip out colors
var msg []byte
baw := byteArrayWriter(msg)
(&protectedANSIWriter{
w: &baw,
mode: removeColor,
}).Write([]byte(event.msg))
msg = baw
return logger.regexp.Match(msg)
}
// Close the base logger
func (logger *WriterLogger) Close() {
logger.mu.Lock()
defer logger.mu.Unlock()
if logger.out != nil {
logger.out.Close()
}
}
// GetName returns empty for these provider loggers
func (logger *WriterLogger) GetName() string {
return ""
}