Toolbox/SingleApplication.py

Sun, 23 Jun 2013 13:12:38 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sun, 23 Jun 2013 13:12:38 +0200
changeset 2736
86cd4d14b58e
parent 2302
f29e9405c851
child 2525
8b507a9a2d40
child 2965
d133c7edd88a
child 3163
9f50365a0870
permissions
-rw-r--r--

Added a wizard for the Qt5 QRegularExpression class.

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1 # -*- coding: utf-8 -*-
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2
2302
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3 # Copyright (c) 2004 - 2013 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing the single application server and client.
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8 """
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9
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10 from PyQt4.QtNetwork import QLocalServer, QLocalSocket
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11
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12
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13 class SingleApplicationServer(QLocalServer):
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14 """
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15 Class implementing the single application server base class.
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16 """
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17 def __init__(self, name):
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18 """
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19 Constructor
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20
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21 @param name name this server is listening to (string)
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22 """
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23 super().__init__()
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24
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25 res = self.listen(name)
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26 if not res:
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27 # maybe it crashed last time
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28 self.removeServer(name)
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29 self.listen(name)
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30
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31 self.newConnection[()].connect(self.__newConnection)
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32
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33 self.qsock = None
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34
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35 def __newConnection(self):
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36 """
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37 Private slot to handle a new connection.
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38 """
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39 sock = self.nextPendingConnection()
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40
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41 # If we already have a connection, refuse this one. It will be closed
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42 # automatically.
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43 if self.qsock is not None:
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44 return
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45
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46 self.qsock = sock
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47
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48 self.qsock.readyRead[()].connect(self.__parseLine)
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49 self.qsock.disconnected[()].connect(self.__disconnected)
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50
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51 def __parseLine(self):
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52 """
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53 Private method to handle data from the client.
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54 """
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55 while self.qsock and self.qsock.canReadLine():
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56 line = bytes(self.qsock.readLine()).decode()
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57
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58 ## print(line) ##debug
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59
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60 eoc = line.find('<') + 1
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61
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62 boc = line.find('>')
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63 if boc >= 0 and eoc > boc:
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64 # handle the command sent by the client.
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65 cmd = line[boc:eoc]
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66 params = line[eoc:-1]
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67
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68 self.handleCommand(cmd, params)
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69
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70 def __disconnected(self):
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71 """
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72 Private method to handle the closure of the socket.
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73 """
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74 self.qsock = None
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75
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76 def shutdown(self):
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77 """
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78 Public method used to shut down the server.
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79 """
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80 if self.qsock is not None:
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81 self.qsock.readyRead[()].disconnect(self.__parseLine)
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82 self.qsock.disconnected.disconnect(self.__disconnected)
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83
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84 self.qsock = None
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85
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86 self.close()
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87
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88 def handleCommand(self, cmd, params):
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89 """
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90 Public slot to handle the command sent by the client.
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91
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92 <b>Note</b>: This method must be overridden by subclasses.
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93
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94 @param cmd commandstring (string)
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95 @param params parameterstring (string)
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96 """
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97 raise RuntimeError("'handleCommand' must be overridden")
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98
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99
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100 class SingleApplicationClient(object):
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101 """
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102 Class implementing the single application client base class.
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103 """
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104 def __init__(self, name):
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105 """
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106 Constructor
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107
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108 @param name name of the local server to connect to (string)
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109 """
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110 self.name = name
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111 self.connected = False
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112
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113 def connect(self):
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114 """
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115 Public method to connect the single application client to its server.
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116
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117 @return value indicating success or an error number. Value is one of:
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118 <table>
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119 <tr><td>0</td><td>No application is running</td></tr>
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120 <tr><td>1</td><td>Application is already running</td></tr>
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121 </table>
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122 """
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123 self.sock = QLocalSocket()
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124 self.sock.connectToServer(self.name)
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125 if self.sock.waitForConnected(10000):
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126 self.connected = True
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127 return 1
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128 else:
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129 err = self.sock.error()
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130 if err == QLocalSocket.ServerNotFoundError:
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131 return 0
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132 else:
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133 return -err
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134
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135 def disconnect(self):
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136 """
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137 Public method to disconnect from the Single Appliocation server.
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138 """
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139 self.sock.disconnectFromServer()
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140 self.connected = False
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141
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142 def processArgs(self, args):
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143 """
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144 Public method to process the command line args passed to the UI.
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145
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146 <b>Note</b>: This method must be overridden by subclasses.
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147
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148 @param args command line args (list of strings)
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149 """
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150 raise RuntimeError("'processArgs' must be overridden")
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151
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152 def sendCommand(self, cmd):
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153 """
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154 Public method to send the command to the application server.
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155
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156 @param cmd command to be sent (string)
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157 """
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158 if self.connected:
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159 self.sock.write(cmd)
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160 self.sock.flush()
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161
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162 def errstr(self):
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163 """
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164 Public method to return a meaningful error string for the last error.
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165
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166 @return error string for the last error (string)
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167 """
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168 return self.sock.errorString()

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