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logger.go
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logger.go
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package logger
import (
"bytes"
"encoding/json"
"fmt"
"github.com/chenglch/goconserver/common"
"strings"
"time"
)
const (
EVENT_TYPE = "event" // some event like connected or disconnected
CONSOLE_TYPE = "console" // console message
REMAIN_TYPE = "remain" // last incomplete record
)
func init() {
LOGGER_INIT_MAP[LINE_LOGGER] = NewLineLogger
LOGGER_INIT_MAP[BYTE_LOGGER] = NewByteLogger
}
func NewLineBuf(Type string, message string, node string, LogTimestamp bool) *LineBuf {
buf := &LineBuf{Type: Type, Message: message, Node: node}
if LogTimestamp {
buf.Date = time.Now().Format("2006-01-02 15:04:05.00000")
}
return buf
}
type LineBuf struct {
Type string `json:"type"`
Message string `json:"message"`
Node string `json:"node"`
Date string `json:"date,omitempty"`
}
func (self *LineBuf) Marshal() ([]byte, error) {
buf, err := json.Marshal(self)
if err != nil {
return nil, err
}
return buf, nil
}
func NewLineLogger() Logger {
logger := LineLogger{
publishers: make([]Publisher, 0),
bufChan: make(chan []byte, serverConfig.Global.Worker),
}
go logger.run()
return &logger
}
type LineLogger struct {
publishers []Publisher
bufChan chan []byte
}
func (self *LineLogger) Register(publisher Publisher) {
self.publishers = append(self.publishers, publisher)
}
func (self *LineLogger) MakeRecord(node string, b []byte, last *RemainBuffer) error {
var err error
var buf []byte
p := 0
if last.Buf != nil {
b = append(last.Buf, b...)
}
for i := 0; i < len(b); i++ {
if b[i] == '\n' {
lineBuf := NewLineBuf(CONSOLE_TYPE, string(b[p:i]), node, serverConfig.Console.LogTimestamp)
p = i + 1
buf, err = lineBuf.Marshal()
if err != nil {
plog.ErrorNode(node, err)
continue
}
self.bufChan <- append(buf, []byte{'\n'}...)
}
}
if len(b[p:]) >= 4096 {
lineBuf := NewLineBuf(CONSOLE_TYPE, string(b[p:]), node, serverConfig.Console.LogTimestamp)
buf, err = lineBuf.Marshal()
if err != nil {
plog.ErrorNode(node, err)
}
self.bufChan <- append(buf, []byte{'\n'}...)
p = len(b)
}
copyLast(last, b[p:])
return nil
}
func (self *LineLogger) PromptLast(node string, last *RemainBuffer) error {
var err error
var buf []byte
if last.Buf != nil {
message := string(last.Buf)
if message == "" {
return nil
}
lineBuf := NewLineBuf(REMAIN_TYPE, message, node, serverConfig.Console.LogTimestamp)
buf, err = lineBuf.Marshal()
if err != nil {
plog.ErrorNode(node, err)
return err
}
self.bufChan <- append(buf, []byte{'\n'}...)
}
return nil
}
func (self *LineLogger) emit(buf []byte) {
for _, publisher := range self.publishers {
publishChan, err := publisher.GetPublishChan()
if err == common.ErrUnsupported {
continue
}
if err != nil {
plog.Error(fmt.Sprintf("Could not get the publish channel, Error: ", err))
continue
}
select {
case publishChan <- buf:
case <-time.After(common.PIPELINE_SEND_INTERVAL * 2):
plog.Warn(fmt.Sprintf("Timeout for waiting publisher %s", publisher.GetName()))
}
}
}
func (self *LineLogger) Fetch(node string, count int) (string, error) {
return "", common.ErrLoggerType
}
func (self *LineLogger) Prompt(node string, message string) error {
var err error
var buf []byte
lineBuf := NewLineBuf(EVENT_TYPE, message, node, serverConfig.Console.LogTimestamp)
buf, err = lineBuf.Marshal()
if err != nil {
plog.ErrorNode(node, err)
return err
}
self.bufChan <- append(buf, []byte{'\n'}...)
return nil
}
func (self *LineLogger) run() {
buf := new(bytes.Buffer)
plog.Debug("Starting line logger")
ticker := time.NewTicker(common.PIPELINE_SEND_INTERVAL)
// timeout may block data
for {
select {
case b := <-self.bufChan:
buf.Write(b)
if buf.Len() > 8192 {
// too large, send immediately
self.emit(buf.Bytes())
// slice in channel is transferred by reference
buf = new(bytes.Buffer)
}
case <-ticker.C:
if buf.Len() > 0 {
// send buf to the channel
self.emit(buf.Bytes())
buf = new(bytes.Buffer)
}
}
}
}
func NewByteLogger() Logger {
return &ByteLogger{publishers: make([]Publisher, 0)}
}
type ByteLogger struct {
publishers []Publisher
}
func (self *ByteLogger) Register(publisher Publisher) {
self.publishers = append(self.publishers, publisher)
}
func (self *ByteLogger) insertStamp(b []byte) ([]byte, error) {
var buf bytes.Buffer
p := 0
defer func() {
// butes.Buffer may panic with ErrTooLarge
if r := recover(); r != nil {
plog.Error(r)
}
}()
for i := 0; i < len(b); i++ {
if b[i] == '\n' {
buf.Write(b[p:i]) // ignore retnru value as err is always nil
buf.WriteString("\n[" + time.Now().Format("2006-01-02 15:04:05") + "] ")
p = i + 1
}
}
if p != len(b) {
buf.Write(b[p:])
}
return buf.Bytes(), nil
}
func (self *ByteLogger) MakeRecord(node string, b []byte, last *RemainBuffer) error {
// FileLogger do not left the buffer that has not been emited
var err error
if serverConfig.Console.LogTimestamp {
b, err = self.insertStamp(b)
if err != nil {
plog.ErrorNode(node, err)
return err
}
}
for _, publisher := range self.publishers {
err = publisher.Publish(node, b)
if err != nil {
plog.ErrorNode(node, err)
continue
}
}
return nil
}
func (self *ByteLogger) Fetch(node string, count int) (string, error) {
var err error
var content string
for _, publisher := range self.publishers {
content, err = publisher.Load(node, count)
if err != nil {
continue
}
// Got the content, stop trying
break
}
if err != nil {
plog.ErrorNode(node, err)
return "", err
}
return content, nil
}
func (self *ByteLogger) Prompt(node string, message string) error {
var err error
if !strings.HasSuffix(message, "\r\n") {
message = message + "\r\n"
}
if serverConfig.Console.LogTimestamp {
message = "\r\n[" + time.Now().Format("2006-01-02 15:04:05") + "] " + message
}
for _, publisher := range self.publishers {
err = publisher.Publish(node, []byte(message))
if err != nil {
plog.ErrorNode(node, err)
continue
}
}
return nil
}
func (self *ByteLogger) PromptLast(node string, last *RemainBuffer) error {
return nil
}