Utilities/BackgroundService.py

Sat, 05 Jul 2014 15:02:45 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 05 Jul 2014 15:02:45 +0200
changeset 3682
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parent 3670
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child 3821
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permissions
-rw-r--r--

Changed a few files to reference eric6.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2013 - 2014 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5 # pylint: disable=C0103
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6
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7 """
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8 Module implementing a background service for the various checkers and other
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9 python interpreter dependent functions.
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10 """
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11
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12 from __future__ import unicode_literals
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13
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14 import json
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15 import os
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16 import struct
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17 import sys
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18 from zlib import adler32
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19
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20 from PyQt5.QtCore import QProcess, pyqtSignal, QTimer
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21 from PyQt5.QtWidgets import QApplication
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22 from PyQt5.QtNetwork import QTcpServer, QHostAddress
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23
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24 from E5Gui import E5MessageBox
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25 from E5Gui.E5Application import e5App
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26 import Preferences
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27 import Utilities
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28
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29 from eric6config import getConfig
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30
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31
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32 class BackgroundService(QTcpServer):
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33 """
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34 Class implementing the main part of the background service.
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35 """
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36 serviceNotAvailable = pyqtSignal(str, str, str, str)
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37
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38 def __init__(self):
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39 """
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40 Constructor of the BackgroundService class.
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41 """
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42 self.processes = {}
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43 self.connections = {}
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44 self.isWorking = None
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45 self.runningJob = [None, None, None, None]
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46 self.__queue = []
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47 self.services = {}
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48
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49 super(BackgroundService, self).__init__()
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50
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51 networkInterface = Preferences.getDebugger("NetworkInterface")
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52 if networkInterface == "all" or '.' in networkInterface:
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53 self.hostAddress = '127.0.0.1'
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54 else:
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55 self.hostAddress = '::1'
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56 self.listen(QHostAddress(self.hostAddress))
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57
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58 self.newConnection.connect(self.on_newConnection)
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59
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60 port = self.serverPort()
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61 ## Note: Need the port if started external in debugger:
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62 print('BackgroundService listening on: %i' % port)
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63 for pyName in ['Python', 'Python3']:
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64 interpreter = Preferences.getDebugger(
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65 pyName + "Interpreter")
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66 process = self.__startExternalClient(interpreter, port)
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67 if process:
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68 if pyName == 'Python':
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69 pyName = 'Python2'
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70 self.processes[pyName] = process, interpreter
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71
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72 def __startExternalClient(self, interpreter, port):
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73 """
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74 Private method to start the background client as external process.
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75
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76 @param interpreter path and name of the executable to start (string)
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77 @param port socket port to which the interpreter should connect (int)
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78 @return the process object (QProcess or None)
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79 """
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80 if interpreter == "" or not Utilities.isinpath(interpreter):
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81 return None
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82
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83 backgroundClient = os.path.join(
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84 getConfig('ericDir'),
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85 "Utilities", "BackgroundClient.py")
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86 proc = QProcess()
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87 args = [backgroundClient, self.hostAddress, str(port)]
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88 proc.start(interpreter, args)
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89 if not proc.waitForStarted(10000):
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90 proc = None
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91 return proc
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92
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93 def __processQueue(self):
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94 """
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95 Private method to take the next service request and send it to the
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96 client.
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97 """
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98 if self.__queue and self.isWorking is None:
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99 fx, lang, fn, data = self.__queue.pop(0)
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100 self.isWorking = lang
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101 self.runningJob = fx, lang, fn, data
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102 self.__send(fx, lang, fn, data)
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103
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104 def __send(self, fx, lang, fn, data):
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105 """
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106 Private method to send a job request to one of the clients.
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107
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108 @param fx remote function name to execute (str)
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109 @param lang language to connect to (str)
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110 @param fn filename for identification (str)
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111 @param data function argument(s) (any basic datatype)
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112 """
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113 connection = self.connections.get(lang)
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114 if connection is None:
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115 if fx != 'INIT':
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116 # Avoid growing recursion deep which could itself result in an
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117 # exception
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118 QTimer.singleShot(
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119 0,
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120 lambda: self.serviceNotAvailable.emit(
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121 fx, lang, fn, self.tr(
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122 '{0} not configured.').format(lang)))
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123 # Reset flag and continue processing queue
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124 self.isWorking = None
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125 self.__processQueue()
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126 else:
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127 packedData = json.dumps([fx, fn, data])
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128 if sys.version_info[0] == 3:
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129 packedData = bytes(packedData, 'utf-8')
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diff changeset
130 header = struct.pack(
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diff changeset
131 b'!II', len(packedData), adler32(packedData) & 0xffffffff)
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
132 connection.write(header)
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
133 connection.write(packedData)
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
134
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135 def __receive(self, lang):
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parents:
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136 """
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
137 Private method to receive the response from the clients.
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
138
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parents: 3209
diff changeset
139 @param lang language of the incomming connection (str)
3159
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parents:
diff changeset
140 """
3241
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3209
diff changeset
141 connection = self.connections[lang]
3159
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
142 header = connection.read(8)
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
143 length, datahash = struct.unpack(b'!II', header)
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
144
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
145 packedData = b''
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
146 while len(packedData) < length:
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
147 connection.waitForReadyRead(50)
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
148 packedData += connection.read(length - len(packedData))
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
149
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
150 assert adler32(packedData) & 0xffffffff == datahash, 'Hashes not equal'
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
151 if sys.version_info[0] == 3:
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
152 packedData = packedData.decode('utf-8')
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents:
diff changeset
153 # "check" if is's a tuple of 3 values
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1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
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parents: 3172
diff changeset
154 fx, fn, data = json.loads(packedData)
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
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parents: 3172
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155
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3172
diff changeset
156 if fx == 'INIT':
3159
02cb2adb4868 First implementation for the BackgroundService.
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parents:
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157 pass
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diff changeset
158 elif fx == 'EXCEPTION':
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159 # Remove connection because it'll close anyway
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160 self.connections.pop(lang, None)
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diff changeset
161 # Call sys.excepthook(type, value, traceback) to emulate the
02cb2adb4868 First implementation for the BackgroundService.
T.Rzepka <Tobias.Rzepka@gmail.com>
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162 # exception which was caught on the client
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5a93c6cdc989 Exception handling for client side implemented.
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diff changeset
163 sys.excepthook(*data)
3579
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parents: 3538
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164 res = E5MessageBox.question(
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parents: 3538
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165 None,
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parents: 3538
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166 self.tr("Restart background client?"),
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parents: 3538
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167 self.tr(
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168 "<p>The background client for <b>{0}</b> has stopped"
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
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169 " due to an exception. It's used by various plug-ins like"
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
170 " the different checkers.</p>"
3581
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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171 "<p>Select"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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172 "<ul>"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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173 "<li><b>'Yes'</b> to restart the client, but abort the"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 3579
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174 " last job</li>"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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175 "<li><b>'Retry'</b> to restart the client and the last"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 3579
diff changeset
176 " job</li>"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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177 "<li><b>'No'</b> to leave the client off.</li>"
03b351be4436 Einige kleinere Korrekturen.
Detlev Offenbach <detlev@die-offenbachs.de>
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178 "</ul></p>"
3579
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179 "<p>Note: The client can be restarted by opening and"
3581
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Detlev Offenbach <detlev@die-offenbachs.de>
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180 " accepting the preferences dialog or reloading/changing"
3579
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
181 " the project.</p>").format(lang),
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
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182 E5MessageBox.Yes | E5MessageBox.No | E5MessageBox.Retry,
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
183 E5MessageBox.Yes)
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diff changeset
184
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parents: 3538
diff changeset
185 if res == E5MessageBox.Retry:
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parents: 3538
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186 self.enqueueRequest(*self.runningJob)
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187 else:
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diff changeset
188 fx, lng, fn, data = self.runningJob
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parents: 3538
diff changeset
189 self.services[(fx, lng)][3](fx, lng, fn, self.tr(
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
190 'An error in Erics background client stopped the service.')
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
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191 )
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
192 if res != E5MessageBox.No:
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193 self.isWorking = None
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parents: 3538
diff changeset
194 self.restartService(lang, True)
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parents: 3538
diff changeset
195 return
3241
957673fc463a Interface for adding different languages to the syntax check, background service
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196 elif data == 'Unknown service.':
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197 callback = self.services.get((fx, lang))
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198 if callback:
957673fc463a Interface for adding different languages to the syntax check, background service
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diff changeset
199 callback[3](fx, lang, fn, data)
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1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
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200 else:
3241
957673fc463a Interface for adding different languages to the syntax check, background service
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diff changeset
201 callback = self.services.get((fx, lang))
3173
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
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diff changeset
202 if callback:
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
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parents: 3172
diff changeset
203 callback[2](fn, *data)
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204
3209
c5432abceb25 CodeStyleChecker moved to background service and done a little cleanup.
T.Rzepka <Tobias.Rzepka@gmail.com>
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diff changeset
205 self.isWorking = None
3173
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diff changeset
206 self.__processQueue()
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diff changeset
207
3579
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208 def preferencesOrProjectChanged(self):
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parents: 3538
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209 """
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diff changeset
210 Public slot to restart the built in languages.
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
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211 """
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parents: 3538
diff changeset
212 for pyName in ['Python', 'Python3']:
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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parents: 3538
diff changeset
213 interpreter = Preferences.getDebugger(
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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parents: 3538
diff changeset
214 pyName + "Interpreter")
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215
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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parents: 3538
diff changeset
216 if pyName == 'Python':
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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parents: 3538
diff changeset
217 pyName = 'Python2'
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218
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diff changeset
219 # Tweak the processes list to reflect the changed interpreter
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220 proc, inter = self.processes.pop(pyName, [None, None])
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parents: 3538
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221 self.processes[pyName] = proc, interpreter
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diff changeset
222
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diff changeset
223 self.restartService(pyName)
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diff changeset
224
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diff changeset
225 def restartService(self, language, forceKill=False):
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226 """
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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parents: 3538
diff changeset
227 Public method to restart a given lanuage.
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diff changeset
228
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diff changeset
229 @param language to restart (str)
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diff changeset
230 @keyparam forceKill flag to kill a running task (bool)
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diff changeset
231 """
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
232 try:
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diff changeset
233 proc, interpreter = self.processes.pop(language)
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T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
234 except KeyError:
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T.Rzepka <Tobias.Rzepka@gmail.com>
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diff changeset
235 return
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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diff changeset
236
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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diff changeset
237 # Don't kill a process if it's still working
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diff changeset
238 if not forceKill:
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diff changeset
239 while self.isWorking is not None:
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diff changeset
240 QApplication.processEvents()
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parents: 3538
diff changeset
241
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diff changeset
242 conn = self.connections.pop(language, None)
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diff changeset
243 if conn:
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diff changeset
244 conn.blockSignals(True)
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diff changeset
245 conn.close()
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T.Rzepka <Tobias.Rzepka@gmail.com>
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diff changeset
246 if proc:
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T.Rzepka <Tobias.Rzepka@gmail.com>
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diff changeset
247 proc.close()
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diff changeset
248
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diff changeset
249 port = self.serverPort()
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250 process = self.__startExternalClient(interpreter, port)
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diff changeset
251 if process:
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diff changeset
252 self.processes[language] = process, interpreter
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parents: 3538
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253
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254 def enqueueRequest(self, fx, lang, fn, data):
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255 """
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256 Public method implementing a queued processing of incomming events.
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257
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258 Dublicate service requests updates an older request to avoid overrun or
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259 starving of the services.
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260 @param fx function name of the service (str)
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261 @param lang language to connect to (str)
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262 @param fn filename for identification (str)
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263 @param data function argument(s) (any basic datatype(s))
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264 """
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265 args = [fx, lang, fn, data]
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266 if fx == 'INIT':
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267 self.__queue.insert(0, args)
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268 else:
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269 for pendingArg in self.__queue:
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270 # Check if it's the same service request (fx, lang, fn equal)
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271 if pendingArg[:3] == args[:3]:
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272 # Update the data
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273 pendingArg[3] = args[3]
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274 break
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275 else:
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276 self.__queue.append(args)
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277 self.__processQueue()
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278
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279 def serviceConnect(
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280 self, fx, lang, modulepath, module, callback,
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281 onErrorCallback=None):
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282 """
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283 Public method to announce a new service to the background
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284 service/client.
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285
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286 @param fx function name of the service (str)
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287 @param lang language of the new service (str)
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288 @param modulepath full path to the module (str)
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289 @param module name to import (str)
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290 @param callback function on service response (function)
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291 @param onErrorCallback function if client isn't available (function)
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292 """
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293 self.services[(fx, lang)] = \
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294 modulepath, module, callback, onErrorCallback
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295 self.enqueueRequest('INIT', lang, fx, [modulepath, module])
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296 if onErrorCallback:
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297 self.serviceNotAvailable.connect(onErrorCallback)
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298
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299 def serviceDisconnect(self, fx, lang):
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300 """
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301 Public method to remove the service from the service list.
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302
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303 @param fx function name of the service (function)
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304 @param lang language of the service (str)
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305 """
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306 serviceArgs = self.services.pop((fx, lang), None)
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307 if serviceArgs and serviceArgs[3]:
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308 self.serviceNotAvailable.disconnect(serviceArgs[3])
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309
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310 def on_newConnection(self):
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311 """
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312 Private slot for new incomming connections from the clients.
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313 """
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314 connection = self.nextPendingConnection()
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315 if not connection.waitForReadyRead(1000):
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316 return
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317 lang = connection.read(64)
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318 if sys.version_info[0] == 3:
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319 lang = lang.decode('utf-8')
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320 # Avoid hanging of eric on shutdown
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321 if self.connections.get(lang):
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322 self.connections[lang].close()
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323 if self.isWorking == lang:
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324 self.isWorking = None
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325 self.connections[lang] = connection
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326 connection.readyRead.connect(
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327 lambda x=lang: self.__receive(x))
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328 connection.disconnected.connect(
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329 lambda x=lang: self.on_disconnectSocket(x))
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330
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331 for (fx, lng), args in self.services.items():
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332 if lng == lang:
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333 # Register service with modulepath and module
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334 self.enqueueRequest('INIT', lng, fx, args[:2])
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335
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336 # Syntax check the open editors again
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337 try:
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338 vm = e5App().getObject("ViewManager")
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339 except KeyError:
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340 return
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diff changeset
341 for editor in vm.getOpenEditors():
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diff changeset
342 if editor.getLanguage() == lang:
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343 QTimer.singleShot(0, editor.checkSyntax)
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344
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345 def on_disconnectSocket(self, lang):
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346 """
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347 Private slot called when connection to a client is lost.
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348
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349 @param lang client language which connection is lost (str)
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350 """
3579
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351 conn = self.connections.pop(lang, None)
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352 if conn:
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353 conn.close()
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diff changeset
354 fx, lng, fn, data = self.runningJob
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diff changeset
355 if fx != 'INIT' and lng == lang:
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diff changeset
356 self.services[(fx, lng)][3](fx, lng, fn, self.tr(
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diff changeset
357 'Erics background client disconnected because of an'
eccd12461319 BackgroundService: Restart of the client in different situations handled.
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diff changeset
358 ' unknown reason.')
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diff changeset
359 )
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360 self.isWorking = None
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diff changeset
361
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diff changeset
362 res = E5MessageBox.yesNo(
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diff changeset
363 None,
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diff changeset
364 self.tr('Background client disconnected.'),
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diff changeset
365 self.tr(
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diff changeset
366 'The background client for <b>{0}</b> disconnect because'
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parents: 3538
diff changeset
367 ' of an unknown reason.<br>Should it be restarted?'
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368 ).format(lang),
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diff changeset
369 yesDefault=True)
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diff changeset
370 if res:
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diff changeset
371 self.restartService(lang)
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diff changeset
372
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373 def shutdown(self):
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374 """
3591
2f2a4a76dd22 Corrected a bunch of source docu issues.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 3581
diff changeset
375 Public method to cleanup the connections and processes when eric is
2f2a4a76dd22 Corrected a bunch of source docu issues.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 3581
diff changeset
376 shuting down.
3173
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3172
diff changeset
377 """
3579
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
378 for connection in self.connections.values():
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
379 # Prevent calling of on_disconnectSocket
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
380 connection.blockSignals(True)
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
381 connection.close()
3173
1fb284abe46e Interface to add user-defined services, e.g. in plugins. Auto syntax check working. Little cleanup.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3172
diff changeset
382
3579
eccd12461319 BackgroundService: Restart of the client in different situations handled.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3538
diff changeset
383 for process, interpreter in self.processes.values():
3505
84e7cee47d10 Start the background client always as external process.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3484
diff changeset
384 process.close()
84e7cee47d10 Start the background client always as external process.
T.Rzepka <Tobias.Rzepka@gmail.com>
parents: 3484
diff changeset
385 process = None

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