/
session.receive.go
265 lines (221 loc) · 7.04 KB
/
session.receive.go
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package road
import (
"context"
"errors"
"fmt"
"github.com/lixianmin/got/loom"
"github.com/lixianmin/got/mathx"
"github.com/lixianmin/got/timex"
"github.com/lixianmin/logo"
"github.com/lixianmin/road/component"
"github.com/lixianmin/road/conn/message"
"github.com/lixianmin/road/conn/packet"
"github.com/lixianmin/road/epoll"
"github.com/lixianmin/road/ifs"
"github.com/lixianmin/road/route"
"github.com/lixianmin/road/serialize"
"github.com/lixianmin/road/util"
"reflect"
"time"
)
/********************************************************************
created: 2020-08-31
author: lixianmin
Copyright (C) - All Rights Reserved
*********************************************************************/
func (my *sessionImpl) goSessionLoop(later loom.Later) {
defer my.Close()
var receivedChan = my.conn.GetReceivedChan()
var closeChan = my.wc.C()
var app = my.app
var heartbeatInterval = app.heartbeatInterval
var heartbeatTimer = app.wheelSecond.NewTimer(heartbeatInterval)
var stepRateLimitTokens = mathx.MaxI32(1, int32(float64(heartbeatInterval)/float64(time.Second)*float64(app.rateLimitBySecond)))
var fetus = &sessionFetus{
lastAt: time.Now(),
heartbeatTimeout: heartbeatInterval * 3,
rateLimitTokens: stepRateLimitTokens,
rateLimitWindow: 2 * stepRateLimitTokens,
}
for {
select {
case <-heartbeatTimer.C:
heartbeatTimer.Reset()
// 使用时间窗口限制令牌数
fetus.rateLimitTokens = mathx.MinI32(fetus.rateLimitWindow, fetus.rateLimitTokens+stepRateLimitTokens)
if err := my.onHeartbeat(fetus); err != nil {
logo.Info("close session(%d) by onHeartbeat(), err=%q", my.id, err)
return
}
case msg := <-receivedChan:
fetus.lastAt = time.Now()
fetus.rateLimitTokens--
if err := my.onReceivedMessage(fetus, msg); err != nil {
logo.Info("close session(%d) by onReceivedMessage(), err=%q", my.id, err)
return
}
//case task := <-my.tasks.C:
// _ = task.Do(my)
case <-closeChan:
logo.Info("close session(%d) by calling session.Close()", my.id)
return
}
}
}
func (my *sessionImpl) onHeartbeat(fetus *sessionFetus) error {
// 如果在一个心跳时间后还没有收到握手消息,就断开链接。
// 登录验证之类的事情是在机会在onHandShaken事件中验证的
if !fetus.isHandshakeReceived {
return errors.New("don't received handshake, disconnect")
}
var passedTime = time.Now().Sub(fetus.lastAt)
if passedTime > fetus.heartbeatTimeout {
return fmt.Errorf("session heartbeat timeout, lastAt=%q, heartbeatTimeout=%s", fetus.lastAt.Format(timex.Layout), fetus.heartbeatTimeout)
}
// 发送心跳包,如果网络是通的,收到心跳返回时会刷新 lastAt
if err := my.writeBytes(my.app.heartbeatPacketData); err != nil {
return fmt.Errorf("failed to write in conn: %s", err.Error())
}
// 注意:libpitaya的heartbeat部分好像是问题的,只能在应用层自己做ping/pong
//logo.Debug("session(%d) sent heartbeat", my.id)
return nil
}
func (my *sessionImpl) onReceivedMessage(fetus *sessionFetus, msg epoll.Message) error {
var err = msg.Err
if err != nil {
return msg.Err
}
packets, err := my.app.packetDecoder.Decode(msg.Data)
if err != nil {
var err1 = fmt.Errorf("failed to decode message: %s", err.Error())
return err1
}
// process all packet
for i := range packets {
var p = packets[i]
switch p.Type {
case packet.Handshake:
if err := my.onReceivedHandshake(fetus, p); err != nil {
return err
}
case packet.HandshakeAck:
// handshake的流程是 client (request) --> server (response) --> client (ack) --> server (received ack)
logo.Debug("session(%d) received handshake ACK", my.id)
case packet.Data:
if err := my.onReceivedData(fetus, p); err != nil {
return err
}
case packet.Heartbeat:
//logo.Debug("session(%d) received heartbeat", my.id)
}
}
return nil
}
// 如果长时间收不到握手消息,服务器会主动断开链接
func (my *sessionImpl) onReceivedHandshake(fetus *sessionFetus, p *packet.Packet) error {
fetus.isHandshakeReceived = true
var err = my.writeBytes(my.app.handshakeResponseData)
if err == nil {
my.onHandShaken.Invoke()
}
return err
}
func (my *sessionImpl) onReceivedData(fetus *sessionFetus, p *packet.Packet) error {
item, err := my.decodeReceivedData(p)
if err != nil {
var err1 = fmt.Errorf("failed to process packet: %s", err.Error())
return err1
}
// 如果令牌数耗尽,则拒绝处理,并给客户端报错
needReply := item.msg.Type != message.Notify
//logo.Debug("needReplay=%v, message=%v", needReply, item.msg)
if fetus.rateLimitTokens <= 0 {
if needReply {
var msg = message.Message{Type: message.Response, Id: item.msg.Id}
var data, err1 = my.encodeMessageMayError(msg, ErrTriggerRateLimit)
if err1 != nil {
return err1
}
var err2 = my.writeBytes(data)
if err2 != nil {
return err2
}
}
// 如果单位时间内消耗令牌太多,则直接断开网络
if fetus.rateLimitTokens <= -fetus.rateLimitWindow {
return ErrKickedByRateLimit
}
return nil
}
// 取handler,准备处理协议
handler, err := my.app.getHandler(item.route)
if err != nil {
return err
}
payload, err := processReceivedData(item, handler, my.app.serializer, my.app.hookCallback)
if needReply {
var msg = message.Message{Type: message.Response, Id: item.msg.Id, Data: payload}
var data, err1 = my.encodeMessageMayError(msg, err)
if err1 != nil {
return err1
}
return my.writeBytes(data)
}
return nil
}
func (my *sessionImpl) decodeReceivedData(p *packet.Packet) (receivedItem, error) {
msg, err := message.Decode(p.Data)
if err != nil {
return receivedItem{}, err
}
r, err := route.Decode(msg.Route)
if err != nil {
return receivedItem{}, err
}
var ctx = context.WithValue(context.Background(), ifs.CtxKeySession, my)
var item = receivedItem{
ctx: ctx,
route: r,
msg: msg,
}
return item, nil
}
func processReceivedData(data receivedItem, handler *component.Handler, serializer serialize.Serializer, hookCallback HookFunc) ([]byte, error) {
// First unmarshal the handler arg that will be passed to
// both handler and pipeline functions
arg, err := unmarshalHandlerArg(handler, serializer, data.msg.Data)
if err != nil {
return nil, err
}
var args []reflect.Value
if arg != nil {
args = []reflect.Value{handler.Receiver, reflect.ValueOf(data.ctx), reflect.ValueOf(arg)}
} else {
args = []reflect.Value{handler.Receiver, reflect.ValueOf(data.ctx)}
}
resp, err := hookCallback(func() (i interface{}, e error) {
return util.PCall(handler.Method, args)
})
if err != nil {
return nil, err
}
ret, err := util.SerializeOrRaw(serializer, resp)
if err != nil {
return nil, err
}
return ret, nil
}
func unmarshalHandlerArg(handler *component.Handler, serializer serialize.Serializer, payload []byte) (interface{}, error) {
if handler.IsRawArg {
return payload, nil
}
var arg interface{}
if handler.Type != nil {
arg = reflect.New(handler.Type.Elem()).Interface()
err := serializer.Unmarshal(payload, arg)
if err != nil {
return nil, err
}
}
return arg, nil
}