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qlog.go
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qlog.go
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package qlog
import (
"fmt"
"github.com/VukoDrakkeinen/Quasar/datadir"
"os"
"path/filepath"
"strconv"
"sync"
"time"
)
type msgSeverity int
func (this msgSeverity) String() string {
switch this {
case Info:
return "Info"
case Warning:
return "WARNING"
case Error:
return "ERROR"
}
return "-UNKNOWN-"
}
type logMessage struct {
s msgSeverity
t time.Time
m string
}
const (
Info msgSeverity = iota
Warning
Error
)
const (
logTimeFormat = "2006-01-02 15:04:05"
)
type LogWriter interface {
Write(logMessage) error
}
type QLogger struct {
writers []LogWriter
lock sync.Mutex
}
type FileLog struct {
file *os.File
newLined bool
}
type StdLog struct{}
type NullLog struct{}
func (this *FileLog) Write(msg logMessage) (err error) {
if !this.newLined {
_, err = this.file.WriteString("\n")
if err != nil {
return err
}
this.newLined = true
}
bstr := []byte(msg.t.Format(logTimeFormat))
bstr = append(bstr, []byte(" "+msg.s.String()+": [")...)
bstr = append(bstr, []byte(msg.m+"]\n")...)
_, err = this.file.Write(bstr)
return err
}
func (this *StdLog) Write(msg logMessage) (err error) {
switch msg.s {
case Info:
_, err = fmt.Println(msg.m)
case Warning:
_, err = fmt.Println(msg.s.String()+":", msg.m)
case Error:
_, err = fmt.Fprintln(os.Stderr, msg.s.String()+":", msg.m)
}
return err
}
func (this *NullLog) Write(msg logMessage) error { return nil }
var defaultLogger QLogger
var logFilenames map[string]struct{}
var cLock sync.Mutex
func init() {
logFilenames = make(map[string]struct{})
defaultLogger = *New(&StdLog{})
defaultLogger.AddWriter(NewFileLog("debug.log"))
}
func NewFileLog(filename string) LogWriter {
cLock.Lock()
defer cLock.Unlock()
if _, exists := logFilenames[filename]; exists {
Log(Warning, "Attempted to create another LogWriter for file", filename) //...we won't hit an infinite recurrence, will we?
return &NullLog{}
}
path := filepath.Join(datadir.Logs(), filename)
rotateLogs(path)
file, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
if err != nil {
Log(Error, `Unable to open log file "`, filename, `".`)
return &NullLog{}
}
ret := &FileLog{file: file}
logFilenames[filename] = struct{}{}
return ret
}
func New(writers ...LogWriter) *QLogger {
ret := &QLogger{
writers: make([]LogWriter, 0, len(writers)),
}
for _, writer := range writers {
ret.AddWriter(writer)
}
return ret
}
func (this *QLogger) AddWriter(writer LogWriter) {
if _, isNull := writer.(*NullLog); !isNull {
this.writers = append(this.writers, writer)
}
} //TODO?: RemoveWriter?
func rotateLogs(path string) {
if info, err := os.Stat(path); err == nil && info.Size() > 512*1024 {
os.Remove(path + ".9")
for i := int64(8); i > 0; i-- {
os.Rename(path+strconv.FormatInt(i-1, 10), path+strconv.FormatInt(i, 10))
}
os.Rename(path, path+".1")
}
}
func (this *QLogger) Log(s msgSeverity, what ...interface{}) (err error) {
m := fmt.Sprintln(what...)
msg := logMessage{s, time.Now().UTC(), m[:len(m)-1]}
for _, writer := range this.writers {
werr := writer.Write(msg)
if err == nil {
err = werr
}
}
return err
}
func (this *QLogger) Logf(s msgSeverity, format string, what ...interface{}) (err error) {
msg := logMessage{s, time.Now().UTC(), fmt.Sprintf(format, what...)}
for _, writer := range this.writers {
werr := writer.Write(msg)
if err == nil {
err = werr
}
}
return err
}
func Log(s msgSeverity, what ...interface{}) error {
return defaultLogger.Log(s, what...)
}
func Logf(s msgSeverity, format string, what ...interface{}) error {
return defaultLogger.Logf(s, format, what...)
}
/*
func (this *BufferedLog) Write(msg logMessage) {
if len(this.msgs) != cap(this.msgs) {
this.msgs = append(this.msgs, msg)
} else {
copy(this.msgs, this.msgs[1:])
this.msgs[len(this.msgs)-1] = msg
}
}
func (this *BufferedLog) SetBufferSize(i int) {
this.lock.Lock()
defer this.lock.Unlock()
if cap(this.msgs) > i {
newMsgs := make([]logMessage, i)
copy(newMsgs, this.msgs[int(math.Dim(float64(len(this.msgs), float64(i)))):])
this.msgs = newMsgs
} else if cap(this.msgs) < i {
newMsgs := make([]logMessage, 0, i)
newMsgs = append(newMsgs, this.msgs...)
this.msgs = newMsgs
}
}
func (this *BufferedLog) BufferSize() int {
this.lock.Lock()
defer this.lock.Unlock()
return cap(this.msgs)
}
//*/