Mercurial Repositories > eric / file comparison
comparison: eric6/E5Network/E5JsonServer.py
eric6/E5Network/E5JsonServer.py
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- 72ba9635ec5c
- child 8301
- 952a05857e81
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2017 - 2021 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing the JSON based server base class. | |
| 8 """ | |
| 9 | |
| 10 import contextlib | |
| 11 import json | |
| 12 | |
| 13 from PyQt5.QtCore import ( | |
| 14 pyqtSlot, QProcess, QProcessEnvironment, QCoreApplication, QEventLoop, | |
| 15 QTimer | |
| 16 ) | |
| 17 from PyQt5.QtNetwork import QTcpServer, QHostAddress | |
| 18 | |
| 19 from E5Gui import E5MessageBox | |
| 20 | |
| 21 import Preferences | |
| 22 import Utilities | |
| 23 | |
| 24 | |
| 25 class E5JsonServer(QTcpServer): | |
| 26 """ | |
| 27 Class implementing a JSON based server base class. | |
| 28 """ | |
| 29 def __init__(self, name="", multiplex=False, parent=None): | |
| 30 """ | |
| 31 Constructor | |
| 32 | |
| 33 @param name name of the server (used for output only) | |
| 34 @type str | |
| 35 @param multiplex flag indicating a multiplexing server | |
| 36 @type bool | |
| 37 @param parent parent object | |
| 38 @type QObject | |
| 39 """ | |
| 40 super().__init__(parent) | |
| 41 | |
| 42 self.__name = name | |
| 43 self.__multiplex = multiplex | |
| 44 if self.__multiplex: | |
| 45 self.__clientProcesses = {} | |
| 46 self.__connections = {} | |
| 47 else: | |
| 48 self.__clientProcess = None | |
| 49 self.__connection = None | |
| 50 | |
| 51 # setup the network interface | |
| 52 networkInterface = Preferences.getDebugger("NetworkInterface") | |
| 53 if networkInterface == "all" or '.' in networkInterface: | |
| 54 # IPv4 | |
| 55 self.__hostAddress = '127.0.0.1' | |
| 56 else: | |
| 57 # IPv6 | |
| 58 self.__hostAddress = '::1' | |
| 59 self.listen(QHostAddress(self.__hostAddress)) | |
| 60 | |
| 61 self.newConnection.connect(self.handleNewConnection) | |
| 62 | |
| 63 port = self.serverPort() | |
| 64 ## Note: Need the port if client is started external in debugger. | |
| 65 print('JSON server ({1}) listening on: {0:d}' # __IGNORE_WARNING__ | |
| 66 .format(port, self.__name)) | |
| 67 | |
| 68 @pyqtSlot() | |
| 69 def handleNewConnection(self): | |
| 70 """ | |
| 71 Public slot for new incoming connections from a client. | |
| 72 """ | |
| 73 connection = self.nextPendingConnection() | |
| 74 if not connection.isValid(): | |
| 75 return | |
| 76 | |
| 77 if self.__multiplex: | |
| 78 if not connection.waitForReadyRead(3000): | |
| 79 return | |
| 80 idString = bytes(connection.readLine()).decode( | |
| 81 "utf-8", 'backslashreplace').strip() | |
| 82 if idString in self.__connections: | |
| 83 self.__connections[idString].close() | |
| 84 self.__connections[idString] = connection | |
| 85 else: | |
| 86 idString = "" | |
| 87 if self.__connection is not None: | |
| 88 self.__connection.close() | |
| 89 | |
| 90 self.__connection = connection | |
| 91 | |
| 92 connection.readyRead.connect( | |
| 93 lambda: self.__receiveJson(idString)) | |
| 94 connection.disconnected.connect( | |
| 95 lambda: self.__handleDisconnect(idString)) | |
| 96 | |
| 97 @pyqtSlot() | |
| 98 def __handleDisconnect(self, idString): | |
| 99 """ | |
| 100 Private slot handling a disconnect of the client. | |
| 101 | |
| 102 @param idString id of the connection been disconnected | |
| 103 @type str | |
| 104 """ | |
| 105 if idString: | |
| 106 if idString in self.__connections: | |
| 107 self.__connections[idString].close() | |
| 108 del self.__connections[idString] | |
| 109 else: | |
| 110 if self.__connection is not None: | |
| 111 self.__connection.close() | |
| 112 | |
| 113 self.__connection = None | |
| 114 | |
| 115 def connectionNames(self): | |
| 116 """ | |
| 117 Public method to get the list of active connection names. | |
| 118 | |
| 119 If this is not a multiplexing server, an empty list is returned. | |
| 120 | |
| 121 @return list of active connection names | |
| 122 @rtype list of str | |
| 123 """ | |
| 124 if self.__multiplex: | |
| 125 return list(self.__connections.keys()) | |
| 126 else: | |
| 127 return [] | |
| 128 | |
| 129 @pyqtSlot() | |
| 130 def __receiveJson(self, idString): | |
| 131 """ | |
| 132 Private slot handling received data from the client. | |
| 133 | |
| 134 @param idString id of the connection been disconnected | |
| 135 @type str | |
| 136 """ | |
| 137 if idString: | |
| 138 try: | |
| 139 connection = self.__connections[idString] | |
| 140 except KeyError: | |
| 141 connection = None | |
| 142 else: | |
| 143 connection = self.__connection | |
| 144 | |
| 145 while connection and connection.canReadLine(): | |
| 146 data = connection.readLine() | |
| 147 jsonLine = bytes(data).decode("utf-8", 'backslashreplace') | |
| 148 | |
| 149 #- print("JSON Server ({0}): {1}".format(self.__name, jsonLine)) | |
| 150 #- this is for debugging only | |
| 151 | |
| 152 try: | |
| 153 clientDict = json.loads(jsonLine.strip()) | |
| 154 except (TypeError, ValueError) as err: | |
| 155 E5MessageBox.critical( | |
| 156 None, | |
| 157 self.tr("JSON Protocol Error"), | |
| 158 self.tr("""<p>The response received from the client""" | |
| 159 """ could not be decoded. Please report""" | |
| 160 """ this issue with the received data to the""" | |
| 161 """ eric bugs email address.</p>""" | |
| 162 """<p>Error: {0}</p>""" | |
| 163 """<p>Data:<br/>{1}</p>""").format( | |
| 164 str(err), Utilities.html_encode(jsonLine.strip())), | |
| 165 E5MessageBox.StandardButtons( | |
| 166 E5MessageBox.Ok)) | |
| 167 return | |
| 168 | |
| 169 self.handleCall(clientDict["method"], clientDict["params"]) | |
| 170 | |
| 171 def sendJson(self, command, params, flush=False, idString=""): | |
| 172 """ | |
| 173 Public method to send a single command to a client. | |
| 174 | |
| 175 @param command command name to be sent | |
| 176 @type str | |
| 177 @param params dictionary of named parameters for the command | |
| 178 @type dict | |
| 179 @param flush flag indicating to flush the data to the socket | |
| 180 @type bool | |
| 181 @param idString id of the connection to send data to | |
| 182 @type str | |
| 183 """ | |
| 184 commandDict = { | |
| 185 "jsonrpc": "2.0", | |
| 186 "method": command, | |
| 187 "params": params, | |
| 188 } | |
| 189 cmd = json.dumps(commandDict) + '\n' | |
| 190 | |
| 191 if idString: | |
| 192 try: | |
| 193 connection = self.__connections[idString] | |
| 194 except KeyError: | |
| 195 connection = None | |
| 196 else: | |
| 197 connection = self.__connection | |
| 198 | |
| 199 if connection is not None: | |
| 200 data = cmd.encode('utf8', 'backslashreplace') | |
| 201 length = "{0:09d}".format(len(data)) | |
| 202 connection.write(length.encode() + data) | |
| 203 if flush: | |
| 204 connection.flush() | |
| 205 | |
| 206 def startClient(self, interpreter, clientScript, clientArgs, idString="", | |
| 207 environment=None): | |
| 208 """ | |
| 209 Public method to start a client process. | |
| 210 | |
| 211 @param interpreter interpreter to be used for the client | |
| 212 @type str | |
| 213 @param clientScript path to the client script | |
| 214 @type str | |
| 215 @param clientArgs list of arguments for the client | |
| 216 @param idString id of the client to be started | |
| 217 @type str | |
| 218 @param environment dictionary of environment settings to pass | |
| 219 @type dict | |
| 220 @return flag indicating a successful client start | |
| 221 @rtype bool | |
| 222 """ | |
| 223 if interpreter == "" or not Utilities.isinpath(interpreter): | |
| 224 return False | |
| 225 | |
| 226 proc = QProcess() | |
| 227 proc.setProcessChannelMode( | |
| 228 QProcess.ProcessChannelMode.ForwardedChannels) | |
| 229 if environment is not None: | |
| 230 env = QProcessEnvironment() | |
| 231 for key, value in list(environment.items()): | |
| 232 env.insert(key, value) | |
| 233 proc.setProcessEnvironment(env) | |
| 234 args = [clientScript, self.__hostAddress, str(self.serverPort())] | |
| 235 if idString: | |
| 236 args.append(idString) | |
| 237 args.extend(clientArgs) | |
| 238 proc.start(interpreter, args) | |
| 239 if not proc.waitForStarted(10000): | |
| 240 proc = None | |
| 241 | |
| 242 if idString: | |
| 243 self.__clientProcesses[idString] = proc | |
| 244 if proc: | |
| 245 timer = QTimer() | |
| 246 timer.setSingleShot(True) | |
| 247 timer.start(30000) # 30s timeout | |
| 248 while ( | |
| 249 idString not in self.connectionNames() and | |
| 250 timer.isActive() | |
| 251 ): | |
| 252 # Give the event loop the chance to process the new | |
| 253 # connection of the client (= slow start). | |
| 254 QCoreApplication.processEvents( | |
| 255 QEventLoop.ProcessEventsFlag.ExcludeUserInputEvents) | |
| 256 else: | |
| 257 self.__clientProcess = proc | |
| 258 | |
| 259 return proc is not None | |
| 260 | |
| 261 def stopClient(self, idString=""): | |
| 262 """ | |
| 263 Public method to stop a client process. | |
| 264 | |
| 265 @param idString id of the client to be stopped | |
| 266 @type str | |
| 267 """ | |
| 268 self.sendJson("Exit", {}, flush=True, idString=idString) | |
| 269 | |
| 270 if idString: | |
| 271 try: | |
| 272 connection = self.__connections[idString] | |
| 273 except KeyError: | |
| 274 connection = None | |
| 275 else: | |
| 276 connection = self.__connection | |
| 277 if connection is not None: | |
| 278 connection.waitForDisconnected() | |
| 279 | |
| 280 if idString: | |
| 281 with contextlib.suppress(KeyError): | |
| 282 self .__clientProcesses[idString].close() | |
| 283 del self.__clientProcesses[idString] | |
| 284 else: | |
| 285 if self.__clientProcess is not None: | |
| 286 self.__clientProcess.close() | |
| 287 self.__clientProcess = None | |
| 288 | |
| 289 def stopAllClients(self): | |
| 290 """ | |
| 291 Public method to stop all clients. | |
| 292 """ | |
| 293 clientNames = self.connectionNames()[:] | |
| 294 for clientName in clientNames: | |
| 295 self.stopClient(clientName) | |
| 296 | |
| 297 ####################################################################### | |
| 298 ## The following methods should be overridden by derived classes | |
| 299 ####################################################################### | |
| 300 | |
| 301 def handleCall(self, method, params): | |
| 302 """ | |
| 303 Public method to handle a method call from the client. | |
| 304 | |
| 305 Note: This is an empty implementation that must be overridden in | |
| 306 derived classes. | |
| 307 | |
| 308 @param method requested method name | |
| 309 @type str | |
| 310 @param params dictionary with method specific parameters | |
| 311 @type dict | |
| 312 """ | |
| 313 pass |
