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hockclient.go
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/
hockclient.go
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package hockevent
import (
"time"
zmq "github.com/pebbe/zmq4"
"github.com/sirupsen/logrus"
)
var log = logrus.New()
type HockClient interface {
Send(toSend <-chan HockEvent)
Recv() <-chan HockEvent
Stop()
}
func Connect(target string) (HockClient, error) {
log.Infof("ZMQ Connecting to %q", target)
var err error
c := &hockClient{}
c.ctx, err = zmq.NewContext()
if err != nil {
return nil, err
}
c.socket, err = c.ctx.NewSocket(zmq.PAIR)
if err != nil {
return nil, err
}
err = c.socket.Connect(target)
if err != nil {
return nil, err
}
c.recv = make(chan HockEvent, 100)
// Sender routine
go func() {
var err error
for err != zmq.ErrorSocketClosed {
if c.toSend != nil {
for p := range c.toSend {
pdata := Serialize(p)
_, err = c.socket.Send(pdata, 0)
}
} else {
time.Sleep(time.Second)
log.Error("No send channel")
}
}
}()
// Receiver routine
go func() {
var err error
var msg string
var event HockEvent
defer close(c.recv)
for err != zmq.ErrorSocketClosed {
msg, err = c.socket.Recv(0)
if err != nil {
if err != zmq.ErrorMoreExpected {
log.Errorf("error receiving message: %s", err)
}
continue
}
event, err = Deserialize([]byte(msg))
if err == nil {
c.recv <- event
} else {
log.Errorf("error parsing msg %q: %s", msg, err)
}
}
}()
return c, nil
}
type hockClient struct {
ctx *zmq.Context
socket *zmq.Socket
toSend <-chan HockEvent
recv chan HockEvent
}
func (h *hockClient) Send(toSend <-chan HockEvent) {
h.toSend = toSend
}
func (h *hockClient) Recv() <-chan HockEvent {
return h.recv
}
func (h *hockClient) Stop() {
_ = h.socket.Close()
_ = h.ctx.Term()
}