Python不捕获zeromq消息

Question

我有一个小程序，在那里我没有收到来自服务器的响应。

这是在Ubuntu14.04上使用python3.4和最新的zeromq和pyqt5。

客户端GUI向服务器发送一条消息，服务器将得到该消息并进行响应，但客户端看不到响应。

以下是代码：

miniServer.py：

import os
import sys
import time
import zmq
from zmq.eventloop import ioloop
from zmq.eventloop.zmqstream import ZMQStream

# Prepare for client socket
ctx = zmq.Context.instance()
sIn = ctx.socket(zmq.PULL)
urlIn = 'tcp://127.0.0.1:1234'
sIn.bind(urlIn)
# Prepare for sockets to GUI and Web
guiCalled = False
webCalled = False
urlGui = 'tcp://127.0.0.1:2345'
urlWeb = 'tcp://127.0.0.1:3456'
sGUI = None
sWeb = None

def __GetConfig__(sender, data):
    if "GUI" == sender:
        print("Sending back config list to GUI")
        sGUI.send_string("From Server to GUI")
    elif "WEB" == sender:
        sWeb.send_string("From Server to Web")
def __CheckGUICalled__():
    # Used to only connnect once
    global guiCalled
    global sGUI
    if not guiCalled:
        print("Connected to client GUI at port 2345")
        guiCalled = True
        sGUI = ctx.socket(zmq.PUSH)
        sGUI.connect(urlGui)
def __CheckWebCalled__():
    # Used to only connnect once
    global webCalled
    global sWeb
    if not webCalled:
        webCalled = True
        sWeb = ctx.socket(zmq.PUSH)
        sWeb.connect(urlWeb)

actions = {
    "GET_CONFIG": __GetConfig__}
clients = {
    "GUI": __CheckGUICalled__,
    "WEB": __CheckWebCalled__}

def check_msg(msg):
    newStr = msg[0].decode("utf-8", "strict")
    if newStr.count(":") == 2:
        [sender, command, data] = newStr.split(":")
        print("Sender: " + sender + ", Command: " + command + ", Data: " + data)
        # connect if not already done
        clients.get(sender, lambda: None)()
        # execute the command sent from client
        actions.get(command, lambda: None)(sender, data)

# register the check_msg callback to be fired
# whenever there is a message on our socket
stream = ZMQStream(sIn)
stream.on_recv(check_msg)

# Setup callback handling the XMOS
tic = time.time()
def xmos_handler():
    # just testing
    print("Loop time: %.3f" % (time.time() - tic))

pc = ioloop.PeriodicCallback(xmos_handler, 200)
pc.start()

# start the eventloop
ioloop.IOLoop.instance().start()

miniGUI.py：

import os
import sys
import zmq
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from zmq.eventloop.zmqstream import ZMQStream

# prepare out socket to server
ctx = zmq.Context.instance()
sOut = ctx.socket(zmq.PUSH)
sOut.connect('tcp://127.0.0.1:1234')

# handle inputs from server
def check_msg(msg):
    newStr = msg[0].decode("utf-8", "strict")
    print("Message: " + newStr + " received")
sIn = ctx.socket(zmq.PULL)
sIn.bind('tcp://127.0.0.1:2345')
stream = ZMQStream(sIn)
stream.on_recv(check_msg)

# setup window
class Form(QWidget):
    def __init__(self, parent=None):
        super(Form, self).__init__(parent)
        nameLabel = QLabel("Name:")
        self.nameLine = QLineEdit()
        self.submitButton = QPushButton("Submit")
        buttonLayout1 = QVBoxLayout()
        buttonLayout1.addWidget(nameLabel)
        buttonLayout1.addWidget(self.nameLine)
        buttonLayout1.addWidget(self.submitButton)
        self.submitButton.clicked.connect(self.submitContact)
        mainLayout = QGridLayout()
        mainLayout.addLayout(buttonLayout1, 0, 1)
        self.setLayout(mainLayout)
        self.setWindowTitle("For Test: GUI:GET_CONFIG:0")

    def submitContact(self):
        name = self.nameLine.text()
        sOut.send_string(name)
        print("Message " + name + " sent")

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    screen = Form()
    screen.show()
    sys.exit(app.exec_())

首先在一次启动服务器：

丙酮3.4 miniServer.py

然后是GUI：

丙酮3.4 miniGUI.py

在编辑小部件中写入字符串：

GUI:GET_CONFIG:0

然后按下submit按钮将在服务器控制台上打印：

发送方: GUI，命令: GET_CONFIG，数据:0 连接到端口2345的客户端GUI 将配置列表发送回GUI

而在GUI控制台上，

GUI:GET_CONFIG:0发送的消息

书面形式，而预期结果应是：

GUI:GET_CONFIG:0发送的消息 消息:从服务器到GUI接收

我做错了什么？

Answer 1

解决方案是使用套接字类型REQ/REP，而不是PUSH/PULL，这使得代码更加简洁。