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listener.go
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listener.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package getty
import (
"sync"
"sync/atomic"
"time"
)
import (
"github.com/eolinker/apinto/dubbo-getty"
hessian "github.com/apache/dubbo-go-hessian2"
gxtime "github.com/dubbogo/gost/time"
perrors "github.com/pkg/errors"
)
import (
"dubbo.apache.org/dubbo-go/v3/common/constant"
"dubbo.apache.org/dubbo-go/v3/common/logger"
"dubbo.apache.org/dubbo-go/v3/protocol/invocation"
"dubbo.apache.org/dubbo-go/v3/remoting"
)
const (
WritePkg_Timeout = 5 * time.Second // TODO: WritePkg_Timeout will entry *.yml
)
var (
errTooManySessions = perrors.New("too many sessions")
errHeartbeatReadTimeout = perrors.New("heartbeat read timeout")
)
type rpcSession struct {
session getty.Session
reqNum int32
}
func (s *rpcSession) AddReqNum(num int32) {
atomic.AddInt32(&s.reqNum, num)
}
func (s *rpcSession) GetReqNum() int32 {
return atomic.LoadInt32(&s.reqNum)
}
type RpcServerHandler struct {
maxSessionNum int
sessionTimeout time.Duration
sessionMap map[getty.Session]*rpcSession
rwlock sync.RWMutex
server *Server
timeoutTimes int
}
func NewRpcServerHandler(maxSessionNum int, sessionTimeout time.Duration, serverP *Server) *RpcServerHandler {
return &RpcServerHandler{
maxSessionNum: maxSessionNum,
sessionTimeout: sessionTimeout,
sessionMap: make(map[getty.Session]*rpcSession),
server: serverP,
}
}
// OnOpen call server session opened, add the session to getty server session list. also onOpen
// will check the max getty server session number
func (h *RpcServerHandler) OnOpen(session getty.Session) error {
var err error
h.rwlock.RLock()
if h.maxSessionNum <= len(h.sessionMap) {
err = errTooManySessions
}
h.rwlock.RUnlock()
if err != nil {
return perrors.WithStack(err)
}
logger.Infof("got session:%s", session.Stat())
h.rwlock.Lock()
h.sessionMap[session] = &rpcSession{session: session}
h.rwlock.Unlock()
return nil
}
// OnError the getty server session has errored, so remove the session from the getty server session list
func (h *RpcServerHandler) OnError(session getty.Session, err error) {
logger.Infof("session{%s} got error{%v}, will be closed.", session.Stat(), err)
h.rwlock.Lock()
delete(h.sessionMap, session)
h.rwlock.Unlock()
}
// OnClose close the session, remove it from the getty server list
func (h *RpcServerHandler) OnClose(session getty.Session) {
logger.Infof("session{%s} is closing......", session.Stat())
h.rwlock.Lock()
delete(h.sessionMap, session)
h.rwlock.Unlock()
}
// OnMessage get request from getty client, update the session reqNum and reply response to client
func (h *RpcServerHandler) OnMessage(session getty.Session, pkg interface{}) {
h.rwlock.Lock()
if _, ok := h.sessionMap[session]; ok {
h.sessionMap[session].reqNum++
}
h.rwlock.Unlock()
decodeResult, drOK := pkg.(*remoting.DecodeResult)
if !drOK || decodeResult == ((*remoting.DecodeResult)(nil)) {
logger.Errorf("illegal package{%#v}", pkg)
return
}
if !decodeResult.IsRequest {
res := decodeResult.Result.(*remoting.Response)
if res.Event {
logger.Debugf("get rpc heartbeat response{%#v}", res)
if res.Error != nil {
logger.Errorf("rpc heartbeat response{error: %#v}", res.Error)
}
res.Handle()
return
}
logger.Errorf("illegal package but not heartbeat. {%#v}", pkg)
return
}
req := decodeResult.Result.(*remoting.Request)
resp := remoting.NewResponse(req.ID, req.Version)
resp.Status = hessian.Response_OK
resp.Event = req.Event
resp.SerialID = req.SerialID
resp.Version = "2.0.2"
// heartbeat
if req.Event {
logger.Debugf("get rpc heartbeat request{%#v}", resp)
reply(session, resp)
return
}
invoc, ok := req.Data.(*invocation.RPCInvocation)
if !ok {
panic("create invocation occur some exception for the type is not suitable one.")
}
attachments := invoc.Attachments()
session.LocalAddr()
attachments[constant.LocalAddr] = session.LocalAddr()
attachments[constant.RemoteAddr] = session.RemoteAddr()
result := h.server.requestHandler(invoc)
if !req.TwoWay {
return
}
resp.Result = result
reply(session, resp)
}
// OnCron check the session health periodic. if the session's sessionTimeout has reached, just close the session
func (h *RpcServerHandler) OnCron(session getty.Session) {
var (
flag bool
active time.Time
)
h.rwlock.RLock()
if _, ok := h.sessionMap[session]; ok {
active = session.GetActive()
if h.sessionTimeout.Nanoseconds() < time.Since(active).Nanoseconds() {
flag = true
logger.Warnf("session{%s} timeout{%s}, reqNum{%d}",
session.Stat(), time.Since(active).String(), h.sessionMap[session].reqNum)
}
}
h.rwlock.RUnlock()
if flag {
h.rwlock.Lock()
delete(h.sessionMap, session)
h.rwlock.Unlock()
session.Close()
}
heartbeatCallBack := func(err error) {
if err != nil {
logger.Warnf("failed to send heartbeat, error{%v}", err)
if h.timeoutTimes >= 3 {
h.rwlock.Lock()
delete(h.sessionMap, session)
h.rwlock.Unlock()
session.Close()
return
}
h.timeoutTimes++
return
}
h.timeoutTimes = 0
}
if err := heartbeat(session, h.server.conf.heartbeatTimeout, heartbeatCallBack); err != nil {
logger.Warnf("failed to send heartbeat, error{%v}", err)
}
}
func reply(session getty.Session, resp *remoting.Response) {
if totalLen, sendLen, err := session.WritePkg(resp, WritePkg_Timeout); err != nil {
if sendLen != 0 && totalLen != sendLen {
logger.Warnf("start to close the session at replying because %d of %d bytes data is sent success. err:%+v", sendLen, totalLen, err)
go session.Close()
}
logger.Errorf("WritePkg error: %#v, %#v", perrors.WithStack(err), resp)
}
}
func heartbeat(session getty.Session, timeout time.Duration, callBack func(err error)) error {
req := remoting.NewRequest("2.0.2")
req.TwoWay = true
req.Event = true
resp := remoting.NewPendingResponse(req.ID)
remoting.AddPendingResponse(resp)
totalLen, sendLen, err := session.WritePkg(req, -1)
if sendLen != 0 && totalLen != sendLen {
logger.Warnf("start to close the session at heartbeat because %d of %d bytes data is sent success. err:%+v", sendLen, totalLen, err)
go session.Close()
}
go func() {
var err1 error
select {
case <-gxtime.After(timeout):
err1 = errHeartbeatReadTimeout
case <-resp.Done:
err1 = resp.Err
}
callBack(err1)
}()
return perrors.WithStack(err)
}