Utilities/SingleApplication.py

Sat, 02 Jan 2010 18:52:53 +0000

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 02 Jan 2010 18:52:53 +0000
changeset 18
3b1f5d872fd7
parent 13
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child 97
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permissions
-rw-r--r--

More renaming to eric5.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2004 - 2010 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.QtCore import SIGNAL
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11 from PyQt4.QtNetwork import QLocalServer, QLocalSocket
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12
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13 import Utilities
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14
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15 class SingleApplicationServer(QLocalServer):
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16 """
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17 Class implementing the single application server base class.
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18 """
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19 def __init__(self, name):
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20 """
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21 Constructor
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22
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23 @param name name this server is listening to (string)
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24 """
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25 QLocalServer.__init__(self)
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26
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27 res = self.listen(name)
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28 if not res:
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29 # maybe it crashed last time
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30 self.removeServer(name)
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31 self.listen(name)
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32
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33 self.connect(self, SIGNAL("newConnection()"), self.__newConnection)
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34
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35 self.qsock = None
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36
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37 def __newConnection(self):
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38 """
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39 Private slot to handle a new connection.
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40 """
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41 sock = self.nextPendingConnection()
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42
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43 # If we already have a connection, refuse this one. It will be closed
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44 # automatically.
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45 if self.qsock is not None:
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46 return
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47
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48 self.qsock = sock
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49
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50 self.connect(self.qsock, SIGNAL('readyRead()'), self.__parseLine)
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51 self.connect(self.qsock, SIGNAL('disconnected()'), self.__disconnected)
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52
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53 def __parseLine(self):
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54 """
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55 Private method to handle data from the client.
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56 """
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57 while self.qsock and self.qsock.canReadLine():
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58 line = bytes(self.qsock.readLine()).decode()
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59
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60 ## print(line) ##debug
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61
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62 eoc = line.find('<') + 1
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63
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64 boc = line.find('>')
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65 if boc >= 0 and eoc > boc:
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66 # handle the command sent by the client.
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67 cmd = line[boc:eoc]
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68 params = line[eoc:-1]
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69
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70 self.handleCommand(cmd, params)
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71
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72 def __disconnected(self):
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73 """
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74 Private method to handle the closure of the socket.
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75 """
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76 self.qsock = None
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77
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78 def shutdown(self):
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79 """
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80 Public method used to shut down the server.
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81 """
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82 if self.qsock is not None:
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83 self.disconnect(self.qsock, SIGNAL('readyRead()'), self.__parseLine)
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84 self.disconnect(self.qsock, SIGNAL('disconnected()'), self.__disconnected)
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85
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86 self.qsock = None
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87
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88 self.close()
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89
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90 def handleCommand(self, cmd, params):
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91 """
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92 Public slot to handle the command sent by the client.
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93
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94 <b>Note</b>: This method must be overridden by subclasses.
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95
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96 @param cmd commandstring (string)
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97 @param params parameterstring (string)
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98 """
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99 raise RuntimeError("'handleCommand' must be overridden")
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100
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101 class SingleApplicationClient(object):
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102 """
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103 Class implementing the single application client base class.
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104 """
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105 def __init__(self, name):
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106 """
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107 Constructor
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108
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109 @param name name of the local server to connect to (string)
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110 """
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111 self.name = name
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112 self.connected = False
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113
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114 def connect(self):
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115 """
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116 Public method to connect the single application client to its server.
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117
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118 @return value indicating success or an error number. Value is one of:
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119 <table>
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120 <tr><td>0</td><td>No application is running</td></tr>
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121 <tr><td>1</td><td>Application is already running</td></tr>
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122 </table>
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123 """
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124 self.sock = QLocalSocket()
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125 self.sock.connectToServer(self.name)
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126 if self.sock.waitForConnected(10000):
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127 self.connected = True
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128 return 1
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129 else:
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130 err = self.sock.error()
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131 if err == QLocalSocket.ServerNotFoundError:
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132 return 0
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133 else:
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134 return -err
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135
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136 def disconnect(self):
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137 """
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138 Public method to disconnect from the Single Appliocation server.
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139 """
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140 self.sock.disconnectFromServer()
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141 self.connected = False
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142
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143 def processArgs(self, args):
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144 """
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145 Public method to process the command line args passed to the UI.
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146
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147 <b>Note</b>: This method must be overridden by subclasses.
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148
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149 @param args command line args (list of strings)
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150 """
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151 raise RuntimeError("'processArgs' must be overridden")
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152
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153 def sendCommand(self, cmd):
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154 """
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155 Public method to send the command to the application server.
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156
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157 @param cmd command to be sent (string)
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158 """
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159 if self.connected:
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160 self.sock.write(cmd)
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161 self.sock.flush()
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162
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163 def errstr(self):
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164 """
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165 Public method to return a meaningful error string for the last error.
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166
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167 @return error string for the last error (string)
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168 """
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169 return self.sock.errorString()

eric ide

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