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logger.go
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logger.go
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package logutil
import (
"bytes"
"fmt"
"io"
"runtime"
"strings"
"sync"
"time"
)
// Logger defines the interface to use for our logging interface.
// All methods should be thread safe (i.e. multiple go routines can
// call these methods simultaneously).
type Logger interface {
// The three usual interfaces, format should not contain the trailing '\n'
Infof(format string, v ...interface{})
Warningf(format string, v ...interface{})
Errorf(format string, v ...interface{})
// Printf will just display information on stdout when possible,
// and will not add any '\n'.
Printf(format string, v ...interface{})
}
// The logger levels are used to store individual logging events
const (
// the usual logging levels
LOGGER_INFO = iota
LOGGER_WARNING
LOGGER_ERROR
// for messages that may contains non-logging events
LOGGER_CONSOLE
)
// LoggerEvent is used to manage individual logging events. It is used
// by ChannelLogger and MemoryLogger.
type LoggerEvent struct {
Time time.Time
Level int
File string
Line int
Value string
}
// ToBuffer formats an individual LoggerEvent into a buffer, without the
// final '\n'
func (event *LoggerEvent) ToBuffer(buf *bytes.Buffer) {
// Avoid Fprintf, for speed. The format is so simple that we
// can do it quickly by hand. It's worth about 3X. Fprintf is hard.
// Lmmdd hh:mm:ss.uuuuuu file:line]
switch event.Level {
case LOGGER_INFO:
buf.WriteByte('I')
case LOGGER_WARNING:
buf.WriteByte('W')
case LOGGER_ERROR:
buf.WriteByte('E')
case LOGGER_CONSOLE:
buf.WriteString(event.Value)
return
}
_, month, day := event.Time.Date()
hour, minute, second := event.Time.Clock()
twoDigits(buf, int(month))
twoDigits(buf, day)
buf.WriteByte(' ')
twoDigits(buf, hour)
buf.WriteByte(':')
twoDigits(buf, minute)
buf.WriteByte(':')
twoDigits(buf, second)
buf.WriteByte('.')
nDigits(buf, 6, event.Time.Nanosecond()/1000, '0')
buf.WriteByte(' ')
buf.WriteString(event.File)
buf.WriteByte(':')
someDigits(buf, event.Line)
buf.WriteByte(']')
buf.WriteByte(' ')
buf.WriteString(event.Value)
}
// String returns the line in one string
func (event *LoggerEvent) String() string {
buf := new(bytes.Buffer)
event.ToBuffer(buf)
return buf.String()
}
// ChannelLogger is a Logger that sends the logging events through a channel for
// consumption.
type ChannelLogger chan LoggerEvent
// NewChannelLogger returns a ChannelLogger fo the given size
func NewChannelLogger(size int) ChannelLogger {
return make(chan LoggerEvent, size)
}
// Infof is part of the Logger interface
func (cl ChannelLogger) Infof(format string, v ...interface{}) {
file, line := fileAndLine(2)
(chan LoggerEvent)(cl) <- LoggerEvent{
Time: time.Now(),
Level: LOGGER_INFO,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
}
}
// Warningf is part of the Logger interface
func (cl ChannelLogger) Warningf(format string, v ...interface{}) {
file, line := fileAndLine(2)
(chan LoggerEvent)(cl) <- LoggerEvent{
Time: time.Now(),
Level: LOGGER_WARNING,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
}
}
// Errorf is part of the Logger interface
func (cl ChannelLogger) Errorf(format string, v ...interface{}) {
file, line := fileAndLine(2)
(chan LoggerEvent)(cl) <- LoggerEvent{
Time: time.Now(),
Level: LOGGER_ERROR,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
}
}
// Errorf is part of the Logger interface
func (cl ChannelLogger) Printf(format string, v ...interface{}) {
file, line := fileAndLine(2)
(chan LoggerEvent)(cl) <- LoggerEvent{
Time: time.Now(),
Level: LOGGER_CONSOLE,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
}
}
// MemoryLogger keeps the logging events in memory.
// All protected by a mutex.
type MemoryLogger struct {
mu sync.Mutex
Events []LoggerEvent
}
// NewMemoryLogger returns a new MemoryLogger
func NewMemoryLogger() *MemoryLogger {
return &MemoryLogger{}
}
// Infof is part of the Logger interface
func (ml *MemoryLogger) Infof(format string, v ...interface{}) {
file, line := fileAndLine(2)
ml.mu.Lock()
defer ml.mu.Unlock()
ml.Events = append(ml.Events, LoggerEvent{
Time: time.Now(),
Level: LOGGER_INFO,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
})
}
// Warningf is part of the Logger interface
func (ml *MemoryLogger) Warningf(format string, v ...interface{}) {
file, line := fileAndLine(2)
ml.mu.Lock()
defer ml.mu.Unlock()
ml.Events = append(ml.Events, LoggerEvent{
Time: time.Now(),
Level: LOGGER_WARNING,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
})
}
// Errorf is part of the Logger interface
func (ml *MemoryLogger) Errorf(format string, v ...interface{}) {
file, line := fileAndLine(2)
ml.mu.Lock()
defer ml.mu.Unlock()
ml.Events = append(ml.Events, LoggerEvent{
Time: time.Now(),
Level: LOGGER_ERROR,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
})
}
// Printf is part of the Logger interface
func (ml *MemoryLogger) Printf(format string, v ...interface{}) {
file, line := fileAndLine(2)
ml.mu.Lock()
defer ml.mu.Unlock()
ml.Events = append(ml.Events, LoggerEvent{
Time: time.Now(),
Level: LOGGER_CONSOLE,
File: file,
Line: line,
Value: fmt.Sprintf(format, v...),
})
}
// String returns all the lines in one String, separated by '\n'
func (ml *MemoryLogger) String() string {
buf := new(bytes.Buffer)
ml.mu.Lock()
defer ml.mu.Unlock()
for _, event := range ml.Events {
event.ToBuffer(buf)
buf.WriteByte('\n')
}
return buf.String()
}
// LoggerWriter is an adapter that implements the io.Writer interface.
type LoggerWriter struct {
logger Logger
}
// NewLoggerWriter returns an io.Writer on top of the logger
func NewLoggerWriter(logger Logger) io.Writer {
return LoggerWriter{
logger: logger,
}
}
// Write implements io.Writer
func (lw LoggerWriter) Write(p []byte) (n int, err error) {
if len(p) == 0 {
return 0, nil
}
lw.logger.Printf("%v", string(p))
return len(p), nil
}
// TeeLogger is a Logger that sends its logs to two underlying logger
type TeeLogger struct {
One, Two Logger
}
func NewTeeLogger(one, two Logger) *TeeLogger {
return &TeeLogger{
One: one,
Two: two,
}
}
func (tl *TeeLogger) Infof(format string, v ...interface{}) {
tl.One.Infof(format, v...)
tl.Two.Infof(format, v...)
}
func (tl *TeeLogger) Warningf(format string, v ...interface{}) {
tl.One.Warningf(format, v...)
tl.Two.Warningf(format, v...)
}
func (tl *TeeLogger) Errorf(format string, v ...interface{}) {
tl.One.Errorf(format, v...)
tl.Two.Errorf(format, v...)
}
func (tl *TeeLogger) Printf(format string, v ...interface{}) {
tl.One.Printf(format, v...)
tl.Two.Printf(format, v...)
}
// array for fast int -> string conversion
const digits = "0123456789"
// twoDigits adds a zero-prefixed two-digit integer to buf
func twoDigits(buf *bytes.Buffer, value int) {
buf.WriteByte(digits[value/10])
buf.WriteByte(digits[value%10])
}
// nDigits adds an n-digit integer d to buf
// padding with pad on the left.
// It assumes d >= 0.
func nDigits(buf *bytes.Buffer, n, d int, pad byte) {
tmp := make([]byte, n)
j := n - 1
for ; j >= 0 && d > 0; j-- {
tmp[j] = digits[d%10]
d /= 10
}
for ; j >= 0; j-- {
tmp[j] = pad
}
buf.Write(tmp)
}
// someDigits adds a zero-prefixed variable-width integer to buf
func someDigits(buf *bytes.Buffer, d int) {
// Print into the top, then copy down.
tmp := make([]byte, 10)
j := 10
for {
j--
tmp[j] = digits[d%10]
d /= 10
if d == 0 {
break
}
}
buf.Write(tmp[j:])
}
// fileAndLine returns the caller's file and line 2 levels above
func fileAndLine(depth int) (string, int) {
_, file, line, ok := runtime.Caller(depth)
if !ok {
return "???", 1
}
slash := strings.LastIndex(file, "/")
if slash >= 0 {
file = file[slash+1:]
}
return file, line
}