// NewClientWithConnection returns a new Client to handle requests to the
// set of services at the other end of the connection.
// An existing connection in the form of a zmq socket together with the zmq
// context they were created with is used
func NewClientWithConnection(ctx *zmq.Context, conn *zmq.Socket) *Client {
// A router socket is the middle-man between client requests and actually sending/receiving on the wire
router, err := ctx.NewSocket(zmq.ROUTER)
if err != nil {
glog.Fatal(err)
}
if err := router.Bind(RouterURL); err != nil {
glog.Fatal(err)
}
client := &Client{
conn: conn,
endpoints: endpoints{
socket: conn,
},
router: router,
ctx: ctx,
}
// Start the proxy in an own routine since it is blocking
go func() {
if err := zmq.Proxy(conn, router, nil); err != nil {
switch zmq.AsErrno(err) {
case zmq.Errno(zmq.ETERM):
glog.Info(err)
case zmq.Errno(syscall.EINTR):
glog.Info(err)
default:
glog.Info(zmq.AsErrno(err))
glog.Info(err)
}
client.Close()
}
}()
// Socket monitor for connect event
monitorURL := "inproc://monitor"
if err := conn.Monitor(monitorURL, zmq.EVENT_CONNECTED|zmq.EVENT_DISCONNECTED); err != nil {
client.Close()
glog.Fatal(err)
}
go client.monitor(monitorURL)
return client
}
/******************************************************************************
* 概述： 订阅退订
* 函数名： dealCmd
* 返回值：
* 参数列表： 参数名 参数类型 取值范围 描述
*
*******************************************************************************/
func (this *ZmqSocket) dealCmd(cmdSocket *zmq4.Socket) (int, error) {
log4.Debug("start deal cmd...")
for { //半包处理
cmdsStr, err0 := cmdSocket.Recv(zmq4.DONTWAIT)
if err0 != nil {
errno1 := zmq4.AsErrno(err0)
switch errno1 {
case zmq4.Errno(syscall.EAGAIN):
return 0, nil
case zmq4.Errno(syscall.EINTR):
continue
default:
log4.Debug("zmq req Get err %v, %d!", errno1, errno1)
}
}
if len(cmdsStr) == 0 {
log4.Debug("deal cmd return")
return 0, nil
}
ss := strings.Split(cmdsStr, " ")
log4.Debug("recv cmd %s", cmdsStr)
for i := 0; i < len(ss); i++ {
if len(ss[i]) == 0 {
continue
}
if ss[i] == "stop" {
// log4.Debug("recv cmd will stop %s %s", this.mreqUrl, this.msubUrl)
cmdSocket.Send("0", 0)
return 1, nil
}
if !this.mChoose {
// log4.Debug("recv cmd ,but notChoose so return")
return 0, nil
}
if ss[i][0] == 'r' {
if err := this.msubSocket.SetSubscribe(ss[i][1:]); err != nil {
log4.Error("SetSubscribe(%s) falied, %s", ss[i][1:], err.Error())
return 0, err
}
log4.Debug("setSubscribe ok %s", ss[i][1:])
continue
}
if ss[i][0] == 'u' {
if err := this.msubSocket.SetUnsubscribe(ss[i][1:]); err != nil {
log4.Error("SetUnSubscribe(%s) falied, %s", ss[i][1:], err.Error())
return 0, err
}
log4.Debug("setUnSubscribe ok %s", ss[i][1:])
continue
}
}
}
return 0, nil
}
func handleGeneralError(err error) {
switch err {
case zmq.ErrorSocketClosed, zmq.ErrorContextClosed:
return
}
switch zmq.AsErrno(err) {
case zmq.ETERM:
return
}
panic(err)
}
func IsEINTR(err error) bool {
switch err.(type) {
case syscall.Errno:
if err == syscall.EINTR {
return true
}
return false
case zmq.Errno:
if zmq.AsErrno(err) == zmq.Errno(syscall.EINTR) {
return true
}
return false
}
return false
}
func handleIOError(err error) bool {
switch err {
case zmq.ErrorSocketClosed, zmq.ErrorContextClosed:
return false
}
switch zmq.AsErrno(err) {
case zmq.Errno(syscall.EAGAIN):
return true
case zmq.ETERM:
return false
}
panic(err)
}
/******************************************************************************
* 概述： Zmq关闭
* 函数名： Close
* 返回值：
* 参数列表： 参数名 参数类型 取值范围 描述
*
*******************************************************************************/
func (this *Zmq) Close() bool {
if this.Mcontext != nil {
if err := this.Mcontext.Term(); err != nil {
switch zmq4.AsErrno(err) {
case zmq4.Errno(syscall.EINTR):
this.Mcontext = nil
return false
case zmq4.ETERM:
this.Mcontext = nil
return true
case zmq4.Errno(syscall.EFAULT):
this.Mcontext = nil
return true
}
}
this.Mcontext = nil
}
log4.Info("conetxt term ok")
return true
}
func (client *Client) monitor(addr string) {
s, err := client.ctx.NewSocket(zmq.PAIR)
if err != nil {
glog.Fatal(err)
}
defer s.Close()
if err := s.Connect(addr); err != nil {
glog.Fatal(err)
}
for {
evtType, addr, _, err := s.RecvEvent(0)
if err != nil {
switch zmq.AsErrno(err) {
case zmq.Errno(zmq.ETERM):
glog.Info(err)
case zmq.Errno(syscall.EINTR):
glog.Info(err)
default:
glog.Error(err)
}
break
}
// Only care about events for our added endpoints
if end, ok := client.endpoints.get(addr); ok {
switch evtType {
case zmq.EVENT_CONNECTED:
// Flag endpoint as connected
if !end.alive {
close(end.connected)
} else {
glog.Info("zrpc: reconnected to ", end.address)
}
case zmq.EVENT_DISCONNECTED:
glog.Infof("zrpc: %s disconnected ", end.address)
}
}
}
}
func main() {
// Socket to talk to server
fmt.Println("Connecting to hello world server...")
client, _ := zmq.NewSocket(zmq.REQ)
defer client.Close()
client.Connect("tcp://localhost:5555")
// Without signal handling, Go will exit on signal, even if the signal was caught by ZeroMQ
chSignal := make(chan os.Signal, 1)
signal.Notify(chSignal, syscall.SIGHUP, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
LOOP:
for {
client.Send("HELLO", 0)
fmt.Println("Sent: HELLO")
reply, err := client.Recv(0)
if err != nil {
if zmq.AsErrno(err) == zmq.Errno(syscall.EINTR) {
// signal was caught by 0MQ
log.Println("Client Recv:", err)
break
} else {
// some error occurred
log.Panicln(err)
}
}
fmt.Println("Received:", reply)
time.Sleep(time.Second)
select {
case sig := <-chSignal:
// signal was caught by Go
log.Println("Signal:", sig)
break LOOP
default:
}
}
}
/******************************************************************************
* 概述： 事件处理
* 函数名： dealMonitorEvent
* 返回值： error
* 参数列表： 参数名 参数类型 取值范围 描述
* isReq bool 是否为req事件
*
*******************************************************************************/
func (this *ZmqSocket) dealMonitorEvent(s *zmq4.Socket, isReq bool) error {
log4.Debug("start dealMonitorEvent...")
for {
a, b, c, err := s.RecvEvent(0)
//if runtime.GOOS == "windows" && len(b) == 0 && c == 0 {
// log4.Debug("monitor eagan windows")
// return nil
//}
if err != nil {
errno1 := zmq4.AsErrno(err)
switch errno1 {
case zmq4.Errno(syscall.EAGAIN):
log4.Debug("monitor eagan ")
return nil
case zmq4.Errno(syscall.EINTR):
log4.Debug("monitor EINTR")
continue
default:
log4.Debug("zmq req Get err %v, %d!", errno1, errno1)
}
}
if a == 0 {
// log4.Debug("monitor return")
return nil
}
switch a {
case zmq4.EVENT_CONNECTED:
log4.Info("sub or req monitor event CONNECTED, url:%s %s", this.mreqUrl, this.mreqUrl)
this.mchooseMutex.Lock()
defer this.mchooseMutex.Unlock()
if isReq {
this.mreqOK = true
} else {
this.msubOK = true
}
if this.mstateChFlag && this.mreqOK && this.msubOK {
this.mstateChFlag = false
select {
case this.mstateCh <- true:
default:
}
}
// this.mok++
case zmq4.EVENT_DISCONNECTED:
log4.Error("sub or req monitor event DISCONNECTED, url:%s %s", this.mreqUrl, this.mreqUrl)
this.mchooseMutex.Lock()
defer this.mchooseMutex.Unlock()
if isReq {
this.mreqOK = false
} else {
this.msubOK = false
}
// this.mok--
if this.mChoose {
this.mChoose = false
topics := this.mzmq.MdataCache.GetSdsTopic()
for i := 0; i < len(*topics); i++ {
if err := this.msubSocket.SetUnsubscribe((*topics)[i]); err != nil {
log4.Error("SetUnSubscribe(%s) falied, %s", (*topics)[i], err.Error())
}
}
this.mzmq.Mevent.UpdateWorkSocket()
}
case zmq4.EVENT_CLOSED:
// this.mchooseMutex.Lock()
// this.mok
// if this.mChoose{
// this.mChoose = false
// this.mevent.UpdateWorkSocket()
// log4.Error("sdssdk zmqreq monitor event CLOSED", b, c)
// }
// this.mchooseMutex.UnLock()
default:
log4.Debug("zmqreq monitor unknow event err", a, b, c, err)
}
}
return nil
}
/******************************************************************************
* 概述： 接收处理推送信息
* 函数名： dealSub
* 返回值：
* 参数列表： 参数名 参数类型 取值范围 描述
*
*******************************************************************************/
func (this *ZmqSocket) dealSub(soc *zmq4.Socket, msgHeadFlag *bool) error {
// log4.Debug("start deal sub0...")
// this.mchooseMutex.RLocker()
if !this.mChoose {
// this.mchooseMutex.RUnlock()
return nil
}
log4.Debug("start deal sub...")
// this.mchooseMutex.RUnlock()
for {
if *msgHeadFlag {
topic, err := soc.Recv(zmq4.DONTWAIT)
if err != nil {
errno1 := zmq4.AsErrno(err)
switch errno1 {
case zmq4.Errno(syscall.EAGAIN):
return nil
case zmq4.Errno(syscall.EINTR):
continue
default:
log4.Debug("zmq req Get err %v, %d!", errno1, errno1)
}
}
if len(topic) == 0 {
// log4.Debug("sub return1")
return nil
}
// log4.Debug("recv sub head =", topic)
*msgHeadFlag = false
} else {
stream, err2 := soc.RecvBytes(zmq4.DONTWAIT)
if err2 != nil {
errno1 := zmq4.AsErrno(err2)
switch errno1 {
case zmq4.Errno(syscall.EAGAIN):
return nil
case zmq4.Errno(syscall.EINTR):
continue
default:
log4.Debug("zmq req Get err %v, %d!", errno1, errno1)
}
}
if len(stream) == 0 {
// log4.Debug("sub return2")
return nil
}
*msgHeadFlag = true
frm, err3 := common.UnwrapBaseProto(stream)
if err3 != nil {
log4.Error("UnwrapBaseProto falied, %s", err3.Error())
return err3
}
mid := common.UnOffset(*frm.GetBody().Mid, 4)
if mid[4-1] == 200 {
log4.Error("sdssdk zmqsub get mid == 200 err")
continue
}
res, err4 := common.UnwrapResponse(frm.GetBody().Mdata)
if err4 != nil {
log4.Error("sdssdk sub UnwrapResponse error:", err4)
continue
}
this.mzmq.MdataCache.UpdatePoints(res)
}
}
return nil
}
// Start registers a zmq endpoint at passed address answering requests for registered services
func (server *Server) Start(addr string) {
// Don't use the global context to avoid package level confusion
ctx, err := zmq.NewContext()
if err != nil {
glog.Fatal(err)
}
// A router socket handles the actual connection
sock, _ := ctx.NewSocket(zmq.ROUTER)
server.conn = sock
// If no prefix is passed, default to tcp
if !strings.HasPrefix(addr, "tcp://") {
addr = "tcp://" + addr
}
server.conn.Bind(addr)
glog.Info("Server listening on ", addr)
// Socket monitor
monitorURL := "inproc://monitor"
if err := server.conn.Monitor(monitorURL, zmq.EVENT_ACCEPTED|zmq.EVENT_DISCONNECTED); err != nil {
glog.Fatal(err)
}
go server.monitor(ctx, monitorURL)
// A dealer socket multiplexes requests to workers
mux, _ := ctx.NewSocket(zmq.DEALER)
defer mux.Close()
mux.Bind("inproc://mux")
// Start backing worker processes
for i := 0; i < server.numWorkers; i++ {
go func(i int) {
worker, _ := ctx.NewSocket(zmq.REP)
defer worker.Close()
worker.Connect("inproc://mux")
glog.V(2).Infof("Started worker #%d", i)
for {
if server.closing {
glog.Warning(ErrShutdown)
break
}
reqBytes, err := worker.RecvBytes(0)
if err != nil {
switch zmq.AsErrno(err) {
// If was interrupted there is no need to log as an error
case zmq.Errno(zmq.ETERM):
glog.Info(err)
default:
// Error receiving is usually fatal
glog.Error(err)
}
break
}
// Decode the request envelope
req := &Request{}
if err := proto.Unmarshal(reqBytes, req); err != nil {
glog.Error(err)
sendError(worker, nil, err)
continue
}
// Make sure it's not expired on arrival
if req.Expires != nil {
if time.Unix(*req.Expires, 0).Before(time.Now()) {
glog.Infof("discarding expired message: '%s'", req.UUID)
sendError(worker, req, NewExpiredError("message expired on arrival"))
continue
}
}
serviceName := path.Dir(strings.TrimPrefix(req.GetPath(), "zrpc://"))
methodName := path.Base(req.GetPath())
// Make sure a handler for this request exists
server.mu.RLock()
service, ok := server.serviceMap[serviceName]
server.mu.RUnlock()
if !ok {
err := fmt.Sprintf("service '%s' is not served", serviceName)
if serviceName == "." {
err = "no service name passed"
}
glog.Warning(err)
sendError(worker, req, errors.New(err))
continue
}
// Make sure the message is registered for this server
if mType, ok := service.method[methodName]; ok {
// Decode the incoming request message
var argv reflect.Value
argIsValue := false // if true, need to indirect before calling.
if mType.ArgType.Kind() == reflect.Ptr {
argv = reflect.New(mType.ArgType.Elem())
} else {
argv = reflect.New(mType.ArgType)
argIsValue = true
}
// argv guaranteed to be a pointer now.
if err := proto.Unmarshal(req.Payload, argv.Interface().(proto.Message)); err != nil {
glog.Error(err)
sendError(worker, req, err)
continue
}
if argIsValue {
argv = reflect.Indirect(argv)
}
glog.V(3).Infof("Received '%s' (%s)", argv.Type().Elem(), req.UUID)
// Invoke the method, providing a new value for the reply (if expected)
var (
returnValues []reflect.Value
replyv reflect.Value
)
if mType.ReplyType != nil {
replyv = reflect.New(mType.ReplyType.Elem())
returnValues = mType.method.Func.Call([]reflect.Value{service.rcvr, argv, replyv})
} else {
returnValues = mType.method.Func.Call([]reflect.Value{service.rcvr, argv})
}
// The return value for the method is an error.
errInter := returnValues[0].Interface()
if errInter != nil {
err := errInter.(error)
sendError(worker, req, err)
continue
}
// Envelope the response message
envelope := &Response{
Path: req.Path,
UUID: req.UUID,
}
// Marshal the response message (if exists)
if mType.ReplyType != nil {
replyBytes, err := proto.Marshal(replyv.Interface().(proto.Message))
if err != nil {
glog.Error(err)
sendError(worker, req, err)
continue
}
envelope.Payload = replyBytes
}
// Marshal the envelope
envBytes, err := proto.Marshal(envelope)
if err != nil {
glog.Error(err)
sendError(worker, req, err)
continue
}
// Send the response
if _, err := worker.SendBytes(envBytes, 0); err != nil {
// Since we could not send, we could not send an error either, just log
glog.Error(err)
}
if mType.ReplyType != nil {
glog.V(3).Infof("Replied '%s' (%s)", mType.ReplyType.Elem(), envelope.UUID)
} else {
glog.V(3).Infof("Replied nil (%s)", envelope.UUID)
}
} else {
// If reached here, the message was not handled by the server
glog.V(1).Infof("message '%s' is not handled by this service", methodName)
sendError(worker, req, fmt.Errorf("message '%s' is not handled by this service", methodName))
}
}
glog.Infof("Closing worker #%d", i)
}(i + 1)
}
// This is blocking so we put it last
if err := zmq.Proxy(sock, mux, nil); err != nil {
switch zmq.AsErrno(err) {
// If was interrupted there is no need to log as an error
case zmq.Errno(syscall.EINTR):
glog.Info(err)
case zmq.Errno(zmq.ETERM):
glog.Info(err)
default:
glog.Error(err)
}
}
// Since it was blocking we could safely close the server if reached here
server.Close()
}