python3+PyQt5 创建多线程网络应用-TCP客户端和TCP服务器实例

本文在上文的基础上重新实现支持多线程的服务器。

以下为TCP客户端的程序代码：

#!/usr/bin/env python3

import sys
from PyQt5.QtCore import (QByteArray, QDataStream, QDate, QIODevice,
   QRegExp, Qt)
from PyQt5.QtWidgets import (QApplication, QDateEdit, QFrame, QGridLayout,
   QHBoxLayout, QLabel, QLineEdit, QPushButton,
   QWidget)
from PyQt5.QtGui import QRegExpValidator
from PyQt5.QtNetwork import (QTcpSocket,)

MAC = True
try:
 from PyQt5.QtGui import qt_mac_set_native_menubar
except ImportError:
 MAC = False

PORT = 9407
SIZEOF_UINT16 = 2

class BuildingServicesClient(QWidget):

def __init__(self, parent=None):
   super(BuildingServicesClient, self).__init__(parent)

self.socket = QTcpSocket()
   self.nextBlockSize = 0
   self.request = None

roomLabel = QLabel("&Room")
   self.roomEdit = QLineEdit()
   roomLabel.setBuddy(self.roomEdit)
   regex = QRegExp(r"[0-9](?:0[1-9]|[12][0-9]|3[0-4])")
   self.roomEdit.setValidator(QRegExpValidator(regex, self))
   self.roomEdit.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
   dateLabel = QLabel("&Date")
   self.dateEdit = QDateEdit()
   dateLabel.setBuddy(self.dateEdit)
   self.dateEdit.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
   self.dateEdit.setDate(QDate.currentDate().addDays(1))
   self.dateEdit.setDisplayFormat("yyyy-MM-dd")
   responseLabel = QLabel("Response")
   self.responseLabel = QLabel()
   self.responseLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)

self.bookButton = QPushButton("&Book")
   self.bookButton.setEnabled(False)
   self.unBookButton = QPushButton("&Unbook")
   self.unBookButton.setEnabled(False)
   quitButton = QPushButton("&Quit")
   if not MAC:
     self.bookButton.setFocusPolicy(Qt.NoFocus)
     self.unBookButton.setFocusPolicy(Qt.NoFocus)

buttonLayout = QHBoxLayout()
   buttonLayout.addWidget(self.bookButton)
   buttonLayout.addWidget(self.unBookButton)
   buttonLayout.addStretch()
   buttonLayout.addWidget(quitButton)
   layout = QGridLayout()
   layout.addWidget(roomLabel, 0, 0)
   layout.addWidget(self.roomEdit, 0, 1)
   layout.addWidget(dateLabel, 0, 2)
   layout.addWidget(self.dateEdit, 0, 3)
   layout.addWidget(responseLabel, 1, 0)
   layout.addWidget(self.responseLabel, 1, 1, 1, 3)
   layout.addLayout(buttonLayout, 2, 1, 1, 4)
   self.setLayout(layout)

self.socket.connected.connect(self.sendRequest)
   self.socket.readyRead.connect(self.readResponse)
   self.socket.disconnected.connect(self.serverHasStopped)
   #self.connect(self.socket,
   #       SIGNAL("error(QAbstractSocket::SocketError)"),
    #      self.serverHasError)
   self.socket.error.connect(self.serverHasError)
   self.roomEdit.textEdited.connect(self.updateUi)
   self.dateEdit.dateChanged.connect(self.updateUi)

self.bookButton.clicked.connect(self.book)
   self.unBookButton.clicked.connect(self.unBook)
   quitButton.clicked.connect(self.close)

self.setWindowTitle("Building Services")

def updateUi(self):
   enabled = False
   if (self.roomEdit.text() and
     self.dateEdit.date() > QDate.currentDate()):
     enabled = True
   if self.request is not None:
     enabled = False
   self.bookButton.setEnabled(enabled)
   self.unBookButton.setEnabled(enabled)

def closeEvent(self, event):
   self.socket.close()
   event.accept()

def book(self):
   self.issueRequest("BOOK", self.roomEdit.text(),
            self.dateEdit.date())

def unBook(self):
   self.issueRequest("UNBOOK", self.roomEdit.text(),
            self.dateEdit.date())

def issueRequest(self, action, room, date):
   self.request = QByteArray()
   stream = QDataStream(self.request, QIODevice.WriteOnly)
   stream.setVersion(QDataStream.Qt_5_7)
   stream.writeUInt16(0)
   stream.writeQString(action)
   stream.writeQString(room)
   stream << date
   stream.device().seek(0)
   stream.writeUInt16(self.request.size() - SIZEOF_UINT16)#overwrite seek(0)
   self.updateUi()
   if self.socket.isOpen():
     self.socket.close()
   self.responseLabel.setText("Connecting to server...")
   self.socket.connectToHost("localhost", PORT)

def sendRequest(self):
   self.responseLabel.setText("Sending request...")
   self.nextBlockSize = 0
   self.socket.write(self.request)
   self.request = None

def readResponse(self):
   stream = QDataStream(self.socket)
   stream.setVersion(QDataStream.Qt_5_7)

while True:
     if self.nextBlockSize == 0:
       if self.socket.bytesAvailable() < SIZEOF_UINT16:
         break
       self.nextBlockSize = stream.readUInt16()
     if self.socket.bytesAvailable() < self.nextBlockSize:
       break
     action = ""
     room = ""
     date = QDate()
     #stream >> action >> room
     action=stream.readQString()
     room=stream.readQString()
     if action != "ERROR":
       stream >> date
     if action == "ERROR":
       msg = "Error: {0}".format(room)
     elif action == "BOOK":
       msg = "Booked room {0} for {1}".format(room,date.toString(Qt.ISODate))
     elif action == "UNBOOK":
       msg = "Unbooked room {0} for {1}".format(room,date.toString(Qt.ISODate))
     self.responseLabel.setText(msg)
     self.updateUi()
     self.nextBlockSize = 0

def serverHasStopped(self):
   self.responseLabel.setText(
       "Error: Connection closed by server")
   self.socket.close()

def serverHasError(self, error):
   self.responseLabel.setText("Error: {0}".format(self.socket.errorString()))
   self.socket.close()

app = QApplication(sys.argv)
form = BuildingServicesClient()
form.show()
app.exec_()

以下为TCP服务端的程序代码：

#!/usr/bin/env python3
import bisect
import collections
import sys
from PyQt5.QtCore import (QByteArray, QDataStream, QDate, QReadWriteLock, QThread,QIODevice, Qt)
from PyQt5.QtWidgets import (QApplication, QMessageBox, QPushButton)
from PyQt5.QtNetwork import (QAbstractSocket,QHostAddress, QTcpServer, QTcpSocket)

PORT = 9407
SIZEOF_UINT16 = 2
MAX_BOOKINGS_PER_DAY = 5

# Key = date, value = list of room IDs
Bookings = collections.defaultdict(list)

def printBookings():
 for key in sorted(Bookings):
   print(key, Bookings[key])
 print()

class Thread(QThread):

lock = QReadWriteLock()

def __init__(self, socketId, parent):
   super(Thread, self).__init__(parent)
   self.socketId = socketId

def run(self):
   socket = QTcpSocket()
   if not socket.setSocketDescriptor(self.socketId):
     #self.emit(SIGNAL("error(int)"), socket.error())
     self.error.connect(socket.error)
     return
   while socket.state() == QAbstractSocket.ConnectedState:
     nextBlockSize = 0
     stream = QDataStream(socket)
     stream.setVersion(QDataStream.Qt_5_7)
     if (socket.waitForReadyRead() and
       socket.bytesAvailable() >= SIZEOF_UINT16):
       nextBlockSize = stream.readUInt16()
     else:
       self.sendError(socket, "Cannot read client request")
       return
     if socket.bytesAvailable() < nextBlockSize:
       if (not socket.waitForReadyRead(60000) or
         socket.bytesAvailable() < nextBlockSize):
         self.sendError(socket, "Cannot read client data")
         return
     action = ""
     room = ""
     date = QDate()
     action=stream.readQString()
     if action in ("BOOK", "UNBOOK"):
       room=stream.readQString()
       stream >> date
       try:
         Thread.lock.lockForRead()
         bookings = Bookings.get(date.toPyDate())
       finally:
         Thread.lock.unlock()
       uroom = str(room)
     if action == "BOOK":
       newlist = False
       try:
         Thread.lock.lockForRead()
         if bookings is None:
           newlist = True
       finally:
         Thread.lock.unlock()
       if newlist:
         try:
           Thread.lock.lockForWrite()
           bookings = Bookings[date.toPyDate()]
         finally:
           Thread.lock.unlock()
       error = None
       insert = False
       try:
         Thread.lock.lockForRead()
         if len(bookings) < MAX_BOOKINGS_PER_DAY:
           if uroom in bookings:
             error = "Cannot accept duplicate booking"
           else:
             insert = True
         else:
           error = "{0} is fully booked".format(date.toString(Qt.ISODate))
       finally:
         Thread.lock.unlock()
       if insert:
         try:
           Thread.lock.lockForWrite()
           bisect.insort(bookings, uroom)
         finally:
           Thread.lock.unlock()
         self.sendReply(socket, action, room, date)
       else:
         self.sendError(socket, error)
     elif action == "UNBOOK":
       error = None
       remove = False
       try:
         Thread.lock.lockForRead()
         if bookings is None or uroom not in bookings:
           error = "Cannot unbook nonexistent booking"
         else:
           remove = True
       finally:
         Thread.lock.unlock()
       if remove:
         try:
           Thread.lock.lockForWrite()
           bookings.remove(uroom)
         finally:
           Thread.lock.unlock()
         self.sendReply(socket, action, room, date)
       else:
         self.sendError(socket, error)
     else:
       self.sendError(socket, "Unrecognized request")
     socket.waitForDisconnected()
     try:
       Thread.lock.lockForRead()
       printBookings()
     finally:
       Thread.lock.unlock()

def sendError(self, socket, msg):
   reply = QByteArray()
   stream = QDataStream(reply, QIODevice.WriteOnly)
   stream.setVersion(QDataStream.Qt_5_7)
   stream.writeUInt16(0)
   stream.writeQString("ERROR")
   stream.writeQString(msg)
   stream.device().seek(0)
   stream.writeUInt16(reply.size() - SIZEOF_UINT16)
   socket.write(reply)

def sendReply(self, socket, action, room, date):
   reply = QByteArray()
   stream = QDataStream(reply, QIODevice.WriteOnly)
   stream.setVersion(QDataStream.Qt_5_7)
   stream.writeUInt16(0)
   stream.writeQString(action)
   stream.writeQString(room)
   stream<<date
   stream.device().seek(0)
   stream.writeUInt16(reply.size() - SIZEOF_UINT16)
   socket.write(reply)

class TcpServer(QTcpServer):

def __init__(self, parent=None):
   super(TcpServer, self).__init__(parent)

def incomingConnection(self, socketId):
   thread = Thread(socketId, self)
   #self.connect(thread, SIGNAL("finished()"),
   #       thread, SLOT("deleteLater()"))
   thread.finished.connect(thread.deleteLater)
   thread.start()

class BuildingServicesDlg(QPushButton):

def __init__(self, parent=None):
   super(BuildingServicesDlg, self).__init__(
       "&Close Server", parent)
   self.setWindowFlags(Qt.WindowStaysOnTopHint)

self.loadBookings()
   self.tcpServer = TcpServer(self)
   if not self.tcpServer.listen(QHostAddress("0.0.0.0"), PORT):
     QMessageBox.critical(self, "Building Services Server","Failed to start server: {0}".format(self.tcpServer.errorString()))
     self.close()
     return

self.clicked.connect(self.close)
   font = self.font()
   font.setPointSize(24)
   self.setFont(font)
   self.setWindowTitle("Building Services Server")

def loadBookings(self):
   # Generate fake data
   import random

today = QDate.currentDate()
   for i in range(10):
     date = today.addDays(random.randint(7, 60))
     for j in range(random.randint(1, MAX_BOOKINGS_PER_DAY)):
       # Rooms are 001..534 excl. 100, 200, ..., 500
       floor = random.randint(0, 5)
       room = random.randint(1, 34)
       bookings = Bookings[date.toPyDate()]
       if len(bookings) >= MAX_BOOKINGS_PER_DAY:
         continue
       bisect.insort(bookings, "{0:1d}{1:02d}".format(
              floor, room))
   printBookings()

app = QApplication(sys.argv)
form = BuildingServicesDlg()
form.show()
form.move(0, 0)
app.exec_()

来源：https://blog.csdn.net/xiaoyangyang20/article/details/71375442