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_()
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