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@@ -1,591 +1,571 b'' | |||
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1 | 1 | """Base classes to manage the interaction with a running kernel. |
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2 | 2 | |
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3 | 3 | Todo |
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4 | 4 | ==== |
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5 | 5 | |
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6 | 6 | * Create logger to handle debugging and console messages. |
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7 | 7 | """ |
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8 | 8 | |
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9 | 9 | #----------------------------------------------------------------------------- |
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10 | 10 | # Copyright (C) 2008-2010 The IPython Development Team |
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11 | 11 | # |
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12 | 12 | # Distributed under the terms of the BSD License. The full license is in |
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13 | 13 | # the file COPYING, distributed as part of this software. |
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14 | 14 | #----------------------------------------------------------------------------- |
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15 | 15 | |
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16 | 16 | #----------------------------------------------------------------------------- |
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17 | 17 | # Imports |
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18 | 18 | #----------------------------------------------------------------------------- |
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19 | 19 | |
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20 | 20 | # Standard library imports. |
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21 | 21 | from Queue import Queue, Empty |
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22 | 22 | from subprocess import Popen |
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23 | 23 | from threading import Thread |
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24 | 24 | import time |
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25 | 25 | |
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26 | 26 | # System library imports. |
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27 | 27 | import zmq |
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28 | 28 | from zmq import POLLIN, POLLOUT, POLLERR |
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29 | 29 | from zmq.eventloop import ioloop |
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30 | 30 | |
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31 | 31 | # Local imports. |
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32 | 32 | from IPython.utils.traitlets import HasTraits, Any, Instance, Type, TCPAddress |
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33 | 33 | from kernel import launch_kernel |
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34 | 34 | from session import Session |
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35 | 35 | |
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36 | 36 | #----------------------------------------------------------------------------- |
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37 | 37 | # Constants and exceptions |
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38 | 38 | #----------------------------------------------------------------------------- |
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39 | 39 | |
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40 | 40 | LOCALHOST = '127.0.0.1' |
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41 | 41 | |
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42 | 42 | class InvalidPortNumber(Exception): |
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43 | 43 | pass |
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44 | 44 | |
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45 | 45 | #----------------------------------------------------------------------------- |
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46 | 46 | # ZMQ Socket Channel classes |
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47 | 47 | #----------------------------------------------------------------------------- |
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48 | 48 | |
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49 | 49 | class ZmqSocketChannel(Thread): |
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50 | 50 | """The base class for the channels that use ZMQ sockets. |
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51 | 51 | """ |
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52 | 52 | context = None |
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53 | 53 | session = None |
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54 | 54 | socket = None |
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55 | 55 | ioloop = None |
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56 | 56 | iostate = None |
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57 | 57 | _address = None |
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58 | 58 | |
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59 | 59 | def __init__(self, context, session, address): |
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60 | 60 | """Create a channel |
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61 | 61 | |
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62 | 62 | Parameters |
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63 | 63 | ---------- |
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64 | 64 | context : :class:`zmq.Context` |
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65 | 65 | The ZMQ context to use. |
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66 | 66 | session : :class:`session.Session` |
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67 | 67 | The session to use. |
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68 | 68 | address : tuple |
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69 | 69 | Standard (ip, port) tuple that the kernel is listening on. |
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70 | 70 | """ |
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71 | 71 | super(ZmqSocketChannel, self).__init__() |
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72 | 72 | self.daemon = True |
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73 | 73 | |
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74 | 74 | self.context = context |
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75 | 75 | self.session = session |
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76 | 76 | if address[1] == 0: |
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77 | 77 | message = 'The port number for a channel cannot be 0.' |
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78 | 78 | raise InvalidPortNumber(message) |
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79 | 79 | self._address = address |
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80 | 80 | |
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81 | 81 | def stop(self): |
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82 | 82 | """Stop the channel's activity. |
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83 | 83 | |
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84 | 84 | This calls :method:`Thread.join` and returns when the thread |
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85 | 85 | terminates. :class:`RuntimeError` will be raised if |
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86 | 86 | :method:`self.start` is called again. |
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87 | 87 | """ |
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88 | 88 | self.join() |
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89 | 89 | |
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90 | 90 | @property |
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91 | 91 | def address(self): |
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92 | 92 | """Get the channel's address as an (ip, port) tuple. |
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93 | 93 | |
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94 | 94 | By the default, the address is (localhost, 0), where 0 means a random |
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95 | 95 | port. |
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96 | 96 | """ |
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97 | 97 | return self._address |
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98 | 98 | |
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99 | 99 | def add_io_state(self, state): |
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100 | 100 | """Add IO state to the eventloop. |
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101 | 101 | |
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102 | 102 | Parameters |
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103 | 103 | ---------- |
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104 | 104 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
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105 | 105 | The IO state flag to set. |
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106 | 106 | |
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107 | 107 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
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108 | 108 | """ |
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109 | 109 | def add_io_state_callback(): |
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110 | 110 | if not self.iostate & state: |
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111 | 111 | self.iostate = self.iostate | state |
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112 | 112 | self.ioloop.update_handler(self.socket, self.iostate) |
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113 | 113 | self.ioloop.add_callback(add_io_state_callback) |
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114 | 114 | |
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115 | 115 | def drop_io_state(self, state): |
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116 | 116 | """Drop IO state from the eventloop. |
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117 | 117 | |
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118 | 118 | Parameters |
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119 | 119 | ---------- |
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120 | 120 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
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121 | 121 | The IO state flag to set. |
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122 | 122 | |
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123 | 123 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
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124 | 124 | """ |
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125 | 125 | def drop_io_state_callback(): |
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126 | 126 | if self.iostate & state: |
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127 | 127 | self.iostate = self.iostate & (~state) |
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128 | 128 | self.ioloop.update_handler(self.socket, self.iostate) |
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129 | 129 | self.ioloop.add_callback(drop_io_state_callback) |
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130 | 130 | |
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131 | 131 | |
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132 | 132 | class XReqSocketChannel(ZmqSocketChannel): |
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133 | 133 | """The XREQ channel for issues request/replies to the kernel. |
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134 | 134 | """ |
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135 | 135 | |
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136 | 136 | command_queue = None |
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137 | 137 | |
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138 | 138 | def __init__(self, context, session, address): |
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139 | 139 | self.command_queue = Queue() |
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140 | 140 | super(XReqSocketChannel, self).__init__(context, session, address) |
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141 | 141 | |
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142 | 142 | def run(self): |
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143 | 143 | """The thread's main activity. Call start() instead.""" |
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144 | 144 | self.socket = self.context.socket(zmq.XREQ) |
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145 | 145 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
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146 | 146 | self.socket.connect('tcp://%s:%i' % self.address) |
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147 | 147 | self.ioloop = ioloop.IOLoop() |
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148 | 148 | self.iostate = POLLERR|POLLIN |
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149 | 149 | self.ioloop.add_handler(self.socket, self._handle_events, |
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150 | 150 | self.iostate) |
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151 | 151 | self.ioloop.start() |
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152 | 152 | |
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153 | 153 | def stop(self): |
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154 | 154 | self.ioloop.stop() |
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155 | 155 | super(XReqSocketChannel, self).stop() |
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156 | 156 | |
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157 | 157 | def call_handlers(self, msg): |
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158 | 158 | """This method is called in the ioloop thread when a message arrives. |
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159 | 159 | |
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160 | 160 | Subclasses should override this method to handle incoming messages. |
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161 | 161 | It is important to remember that this method is called in the thread |
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162 | 162 | so that some logic must be done to ensure that the application leve |
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163 | 163 | handlers are called in the application thread. |
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164 | 164 | """ |
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165 | 165 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
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166 | 166 | |
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167 | 167 | def execute(self, code): |
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168 | 168 | """Execute code in the kernel. |
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169 | 169 | |
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170 | 170 | Parameters |
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171 | 171 | ---------- |
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172 | 172 | code : str |
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173 | 173 | A string of Python code. |
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174 | 174 | |
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175 | 175 | Returns |
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176 | 176 | ------- |
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177 | 177 | The msg_id of the message sent. |
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178 | 178 | """ |
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179 | 179 | # Create class for content/msg creation. Related to, but possibly |
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180 | 180 | # not in Session. |
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181 | 181 | content = dict(code=code) |
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182 | 182 | msg = self.session.msg('execute_request', content) |
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183 | 183 | self._queue_request(msg) |
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184 | 184 | return msg['header']['msg_id'] |
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185 | 185 | |
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186 | 186 | def complete(self, text, line, block=None): |
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187 | 187 | """Tab complete text, line, block in the kernel's namespace. |
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188 | 188 | |
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189 | 189 | Parameters |
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190 | 190 | ---------- |
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191 | 191 | text : str |
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192 | 192 | The text to complete. |
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193 | 193 | line : str |
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194 | 194 | The full line of text that is the surrounding context for the |
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195 | 195 | text to complete. |
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196 | 196 | block : str |
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197 | 197 | The full block of code in which the completion is being requested. |
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198 | 198 | |
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199 | 199 | Returns |
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200 | 200 | ------- |
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201 | 201 | The msg_id of the message sent. |
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202 | 202 | """ |
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203 | 203 | content = dict(text=text, line=line) |
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204 | 204 | msg = self.session.msg('complete_request', content) |
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205 | 205 | self._queue_request(msg) |
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206 | 206 | return msg['header']['msg_id'] |
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207 | 207 | |
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208 | 208 | def object_info(self, oname): |
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209 | 209 | """Get metadata information about an object. |
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210 | 210 | |
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211 | 211 | Parameters |
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212 | 212 | ---------- |
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213 | 213 | oname : str |
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214 | 214 | A string specifying the object name. |
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215 | 215 | |
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216 | 216 | Returns |
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217 | 217 | ------- |
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218 | 218 | The msg_id of the message sent. |
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219 | 219 | """ |
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220 | 220 | content = dict(oname=oname) |
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221 | 221 | msg = self.session.msg('object_info_request', content) |
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222 | 222 | self._queue_request(msg) |
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223 | 223 | return msg['header']['msg_id'] |
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224 | 224 | |
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225 | 225 | def _handle_events(self, socket, events): |
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226 | 226 | if events & POLLERR: |
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227 | 227 | self._handle_err() |
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228 | 228 | if events & POLLOUT: |
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229 | 229 | self._handle_send() |
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230 | 230 | if events & POLLIN: |
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231 | 231 | self._handle_recv() |
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232 | 232 | |
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233 | 233 | def _handle_recv(self): |
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234 | 234 | msg = self.socket.recv_json() |
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235 | 235 | self.call_handlers(msg) |
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236 | 236 | |
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237 | 237 | def _handle_send(self): |
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238 | 238 | try: |
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239 | 239 | msg = self.command_queue.get(False) |
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240 | 240 | except Empty: |
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241 | 241 | pass |
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242 | 242 | else: |
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243 | 243 | self.socket.send_json(msg) |
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244 | 244 | if self.command_queue.empty(): |
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245 | 245 | self.drop_io_state(POLLOUT) |
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246 | 246 | |
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247 | 247 | def _handle_err(self): |
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248 | 248 | # We don't want to let this go silently, so eventually we should log. |
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249 | 249 | raise zmq.ZMQError() |
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250 | 250 | |
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251 | 251 | def _queue_request(self, msg): |
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252 | 252 | self.command_queue.put(msg) |
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253 | 253 | self.add_io_state(POLLOUT) |
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254 | 254 | |
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255 | 255 | |
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256 | 256 | class SubSocketChannel(ZmqSocketChannel): |
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257 | 257 | """The SUB channel which listens for messages that the kernel publishes. |
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258 | 258 | """ |
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259 | 259 | |
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260 | 260 | def __init__(self, context, session, address): |
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261 | 261 | super(SubSocketChannel, self).__init__(context, session, address) |
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262 | 262 | |
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263 | 263 | def run(self): |
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264 | 264 | """The thread's main activity. Call start() instead.""" |
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265 | 265 | self.socket = self.context.socket(zmq.SUB) |
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266 | 266 | self.socket.setsockopt(zmq.SUBSCRIBE,'') |
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267 | 267 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
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268 | 268 | self.socket.connect('tcp://%s:%i' % self.address) |
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269 | 269 | self.ioloop = ioloop.IOLoop() |
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270 | 270 | self.iostate = POLLIN|POLLERR |
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271 | 271 | self.ioloop.add_handler(self.socket, self._handle_events, |
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272 | 272 | self.iostate) |
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273 | 273 | self.ioloop.start() |
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274 | 274 | |
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275 | 275 | def stop(self): |
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276 | 276 | self.ioloop.stop() |
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277 | 277 | super(SubSocketChannel, self).stop() |
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278 | 278 | |
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279 | 279 | def call_handlers(self, msg): |
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280 | 280 | """This method is called in the ioloop thread when a message arrives. |
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281 | 281 | |
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282 | 282 | Subclasses should override this method to handle incoming messages. |
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283 | 283 | It is important to remember that this method is called in the thread |
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284 | 284 | so that some logic must be done to ensure that the application leve |
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285 | 285 | handlers are called in the application thread. |
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286 | 286 | """ |
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287 | 287 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
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288 | 288 | |
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289 | 289 | def flush(self, timeout=1.0): |
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290 | 290 | """Immediately processes all pending messages on the SUB channel. |
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291 | 291 | |
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292 | 292 | Callers should use this method to ensure that :method:`call_handlers` |
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293 | 293 | has been called for all messages that have been received on the |
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294 | 294 | 0MQ SUB socket of this channel. |
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295 | 295 | |
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296 | 296 | This method is thread safe. |
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297 | 297 | |
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298 | 298 | Parameters |
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299 | 299 | ---------- |
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300 | 300 | timeout : float, optional |
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301 | 301 | The maximum amount of time to spend flushing, in seconds. The |
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302 | 302 | default is one second. |
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303 | 303 | """ |
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304 | 304 | # We do the IOLoop callback process twice to ensure that the IOLoop |
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305 | 305 | # gets to perform at least one full poll. |
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306 | 306 | stop_time = time.time() + timeout |
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307 | 307 | for i in xrange(2): |
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308 | 308 | self._flushed = False |
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309 | 309 | self.ioloop.add_callback(self._flush) |
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310 | 310 | while not self._flushed and time.time() < stop_time: |
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311 | 311 | time.sleep(0.01) |
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312 | 312 | |
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313 | 313 | def _handle_events(self, socket, events): |
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314 | 314 | # Turn on and off POLLOUT depending on if we have made a request |
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315 | 315 | if events & POLLERR: |
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316 | 316 | self._handle_err() |
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317 | 317 | if events & POLLIN: |
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318 | 318 | self._handle_recv() |
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319 | 319 | |
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320 | 320 | def _handle_err(self): |
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321 | 321 | # We don't want to let this go silently, so eventually we should log. |
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322 | 322 | raise zmq.ZMQError() |
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323 | 323 | |
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324 | 324 | def _handle_recv(self): |
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325 | 325 | # Get all of the messages we can |
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326 | 326 | while True: |
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327 | 327 | try: |
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328 | 328 | msg = self.socket.recv_json(zmq.NOBLOCK) |
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329 | 329 | except zmq.ZMQError: |
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330 | 330 | # Check the errno? |
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331 | 331 | # Will this trigger POLLERR? |
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332 | 332 | break |
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333 | 333 | else: |
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334 | 334 | self.call_handlers(msg) |
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335 | 335 | |
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336 | 336 | def _flush(self): |
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337 | 337 | """Callback for :method:`self.flush`.""" |
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338 | 338 | self._flushed = True |
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339 | 339 | |
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340 | 340 | |
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341 | 341 | class RepSocketChannel(ZmqSocketChannel): |
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342 | 342 | """A reply channel to handle raw_input requests that the kernel makes.""" |
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343 | 343 | |
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344 | 344 | msg_queue = None |
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345 | 345 | |
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346 | 346 | def __init__(self, context, session, address): |
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347 | 347 | self.msg_queue = Queue() |
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348 | 348 | super(RepSocketChannel, self).__init__(context, session, address) |
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349 | 349 | |
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350 | 350 | def run(self): |
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351 | 351 | """The thread's main activity. Call start() instead.""" |
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352 | 352 | self.socket = self.context.socket(zmq.XREQ) |
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353 | 353 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
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354 | 354 | self.socket.connect('tcp://%s:%i' % self.address) |
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355 | 355 | self.ioloop = ioloop.IOLoop() |
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356 | 356 | self.iostate = POLLERR|POLLIN |
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357 | 357 | self.ioloop.add_handler(self.socket, self._handle_events, |
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358 | 358 | self.iostate) |
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359 | 359 | self.ioloop.start() |
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360 | 360 | |
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361 | 361 | def stop(self): |
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362 | 362 | self.ioloop.stop() |
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363 | 363 | super(RepSocketChannel, self).stop() |
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364 | 364 | |
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365 | 365 | def call_handlers(self, msg): |
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366 | 366 | """This method is called in the ioloop thread when a message arrives. |
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367 | 367 | |
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368 | 368 | Subclasses should override this method to handle incoming messages. |
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369 | 369 | It is important to remember that this method is called in the thread |
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370 | 370 | so that some logic must be done to ensure that the application leve |
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371 | 371 | handlers are called in the application thread. |
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372 | 372 | """ |
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373 | 373 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
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374 | 374 | |
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375 | 375 | def input(self, string): |
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376 | 376 | """Send a string of raw input to the kernel.""" |
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377 | 377 | content = dict(value=string) |
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378 | 378 | msg = self.session.msg('input_reply', content) |
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379 | 379 | self._queue_reply(msg) |
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380 | 380 | |
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381 | 381 | def _handle_events(self, socket, events): |
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382 | 382 | if events & POLLERR: |
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383 | 383 | self._handle_err() |
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384 | 384 | if events & POLLOUT: |
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385 | 385 | self._handle_send() |
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386 | 386 | if events & POLLIN: |
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387 | 387 | self._handle_recv() |
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388 | 388 | |
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389 | 389 | def _handle_recv(self): |
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390 | 390 | msg = self.socket.recv_json() |
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391 | 391 | self.call_handlers(msg) |
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392 | 392 | |
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393 | 393 | def _handle_send(self): |
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394 | 394 | try: |
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395 | 395 | msg = self.msg_queue.get(False) |
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396 | 396 | except Empty: |
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397 | 397 | pass |
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398 | 398 | else: |
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399 | 399 | self.socket.send_json(msg) |
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400 | 400 | if self.msg_queue.empty(): |
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401 | 401 | self.drop_io_state(POLLOUT) |
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402 | 402 | |
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403 | 403 | def _handle_err(self): |
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404 | 404 | # We don't want to let this go silently, so eventually we should log. |
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405 | 405 | raise zmq.ZMQError() |
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406 | 406 | |
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407 | 407 | def _queue_reply(self, msg): |
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408 | 408 | self.msg_queue.put(msg) |
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409 | 409 | self.add_io_state(POLLOUT) |
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410 | 410 | |
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411 | 411 | |
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412 | 412 | #----------------------------------------------------------------------------- |
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413 | 413 | # Main kernel manager class |
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414 | 414 | #----------------------------------------------------------------------------- |
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415 | 415 | |
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416 | 416 | class KernelManager(HasTraits): |
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417 | 417 | """ Manages a kernel for a frontend. |
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418 | 418 | |
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419 | 419 | The SUB channel is for the frontend to receive messages published by the |
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420 | 420 | kernel. |
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421 | 421 | |
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422 | 422 | The REQ channel is for the frontend to make requests of the kernel. |
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423 | 423 | |
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424 | 424 | The REP channel is for the kernel to request stdin (raw_input) from the |
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425 | 425 | frontend. |
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426 | 426 | """ |
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427 | 427 | # The PyZMQ Context to use for communication with the kernel. |
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428 | context = Instance(zmq.Context) | |
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428 | context = Instance(zmq.Context,(),{}) | |
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429 | 429 | |
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430 | 430 | # The Session to use for communication with the kernel. |
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431 | session = Instance(Session) | |
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431 | session = Instance(Session,(),{}) | |
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432 | 432 | |
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433 | 433 | # The kernel process with which the KernelManager is communicating. |
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434 | 434 | kernel = Instance(Popen) |
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435 | 435 | |
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436 | 436 | # The classes to use for the various channels. |
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437 | 437 | xreq_channel_class = Type(XReqSocketChannel) |
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438 | 438 | sub_channel_class = Type(SubSocketChannel) |
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439 | 439 | rep_channel_class = Type(RepSocketChannel) |
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440 | 440 | |
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441 | 441 | # Protected traits. |
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442 |
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443 |
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444 |
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442 | xreq_address = TCPAddress((LOCALHOST, 0)) | |
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443 | sub_address = TCPAddress((LOCALHOST, 0)) | |
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444 | rep_address = TCPAddress((LOCALHOST, 0)) | |
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445 | 445 | _xreq_channel = Any |
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446 | 446 | _sub_channel = Any |
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447 | 447 | _rep_channel = Any |
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448 | 448 | |
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449 | def __init__(self, xreq_address=None, sub_address=None, rep_address=None, | |
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450 | context=None, session=None): | |
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451 | super(KernelManager, self).__init__() | |
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452 | self._xreq_address = (LOCALHOST, 0) if xreq_address is None else xreq_address | |
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453 | self._sub_address = (LOCALHOST, 0) if sub_address is None else sub_address | |
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454 | self._rep_address = (LOCALHOST, 0) if rep_address is None else rep_address | |
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455 | self.context = zmq.Context() if context is None else context | |
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456 | self.session = Session() if session is None else session | |
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457 | super(KernelManager, self).__init__() | |
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449 | def __init__(self, **kwargs): | |
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450 | super(KernelManager, self).__init__(**kwargs) | |
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458 | 451 | |
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459 | 452 | #--------------------------------- ----------------------------------------- |
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460 | 453 | # Channel management methods: |
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461 | 454 | #-------------------------------------------------------------------------- |
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462 | 455 | |
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463 | 456 | def start_channels(self): |
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464 | 457 | """Starts the channels for this kernel. |
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465 | 458 | |
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466 | 459 | This will create the channels if they do not exist and then start |
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467 | 460 | them. If port numbers of 0 are being used (random ports) then you |
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468 | 461 | must first call :method:`start_kernel`. If the channels have been |
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469 | 462 | stopped and you call this, :class:`RuntimeError` will be raised. |
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470 | 463 | """ |
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471 | 464 | self.xreq_channel.start() |
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472 | 465 | self.sub_channel.start() |
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473 | 466 | self.rep_channel.start() |
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474 | 467 | |
|
475 | 468 | def stop_channels(self): |
|
476 | 469 | """Stops the channels for this kernel. |
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477 | 470 | |
|
478 | 471 | This stops the channels by joining their threads. If the channels |
|
479 | 472 | were not started, :class:`RuntimeError` will be raised. |
|
480 | 473 | """ |
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481 | 474 | self.xreq_channel.stop() |
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482 | 475 | self.sub_channel.stop() |
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483 | 476 | self.rep_channel.stop() |
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484 | 477 | |
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485 | 478 | @property |
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486 | 479 | def channels_running(self): |
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487 | 480 | """Are all of the channels created and running?""" |
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488 | 481 | return self.xreq_channel.is_alive() \ |
|
489 | 482 | and self.sub_channel.is_alive() \ |
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490 | 483 | and self.rep_channel.is_alive() |
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491 | 484 | |
|
492 | 485 | #-------------------------------------------------------------------------- |
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493 | 486 | # Kernel process management methods: |
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494 | 487 | #-------------------------------------------------------------------------- |
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495 | 488 | |
|
496 | 489 | def start_kernel(self): |
|
497 | 490 | """Starts a kernel process and configures the manager to use it. |
|
498 | 491 | |
|
499 | 492 | If random ports (port=0) are being used, this method must be called |
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500 | 493 | before the channels are created. |
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501 | 494 | """ |
|
502 | 495 | xreq, sub, rep = self.xreq_address, self.sub_address, self.rep_address |
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503 | 496 | if xreq[0] != LOCALHOST or sub[0] != LOCALHOST or rep[0] != LOCALHOST: |
|
504 | 497 | raise RuntimeError("Can only launch a kernel on localhost." |
|
505 | 498 | "Make sure that the '*_address' attributes are " |
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506 | 499 | "configured properly.") |
|
507 | 500 | |
|
508 | 501 | self.kernel, xrep, pub, req = launch_kernel( |
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509 | 502 | xrep_port=xreq[1], pub_port=sub[1], req_port=rep[1]) |
|
510 |
self. |
|
|
511 |
self. |
|
|
512 |
self. |
|
|
503 | self.xreq_address = (LOCALHOST, xrep) | |
|
504 | self.sub_address = (LOCALHOST, pub) | |
|
505 | self.rep_address = (LOCALHOST, req) | |
|
513 | 506 | |
|
514 | 507 | @property |
|
515 | 508 | def has_kernel(self): |
|
516 | 509 | """Returns whether a kernel process has been specified for the kernel |
|
517 | 510 | manager. |
|
518 | 511 | """ |
|
519 | 512 | return self.kernel is not None |
|
520 | 513 | |
|
521 | 514 | def kill_kernel(self): |
|
522 | 515 | """ Kill the running kernel. """ |
|
523 | 516 | if self.kernel is not None: |
|
524 | 517 | self.kernel.kill() |
|
525 | 518 | self.kernel = None |
|
526 | 519 | else: |
|
527 | 520 | raise RuntimeError("Cannot kill kernel. No kernel is running!") |
|
528 | 521 | |
|
529 | 522 | def signal_kernel(self, signum): |
|
530 | 523 | """ Sends a signal to the kernel. """ |
|
531 | 524 | if self.kernel is not None: |
|
532 | 525 | self.kernel.send_signal(signum) |
|
533 | 526 | else: |
|
534 | 527 | raise RuntimeError("Cannot signal kernel. No kernel is running!") |
|
535 | 528 | |
|
536 | 529 | @property |
|
537 | 530 | def is_alive(self): |
|
538 | 531 | """Is the kernel process still running?""" |
|
539 | 532 | if self.kernel is not None: |
|
540 | 533 | if self.kernel.poll() is None: |
|
541 | 534 | return True |
|
542 | 535 | else: |
|
543 | 536 | return False |
|
544 | 537 | else: |
|
545 | 538 | # We didn't start the kernel with this KernelManager so we don't |
|
546 | 539 | # know if it is running. We should use a heartbeat for this case. |
|
547 | 540 | return True |
|
548 | 541 | |
|
549 | 542 | #-------------------------------------------------------------------------- |
|
550 | 543 | # Channels used for communication with the kernel: |
|
551 | 544 | #-------------------------------------------------------------------------- |
|
552 | 545 | |
|
553 | 546 | @property |
|
554 | 547 | def xreq_channel(self): |
|
555 | 548 | """Get the REQ socket channel object to make requests of the kernel.""" |
|
556 | 549 | if self._xreq_channel is None: |
|
557 | 550 | self._xreq_channel = self.xreq_channel_class(self.context, |
|
558 | 551 | self.session, |
|
559 | 552 | self.xreq_address) |
|
560 | 553 | return self._xreq_channel |
|
561 | 554 | |
|
562 | 555 | @property |
|
563 | 556 | def sub_channel(self): |
|
564 | 557 | """Get the SUB socket channel object.""" |
|
565 | 558 | if self._sub_channel is None: |
|
566 | 559 | self._sub_channel = self.sub_channel_class(self.context, |
|
567 | 560 | self.session, |
|
568 | 561 | self.sub_address) |
|
569 | 562 | return self._sub_channel |
|
570 | 563 | |
|
571 | 564 | @property |
|
572 | 565 | def rep_channel(self): |
|
573 | 566 | """Get the REP socket channel object to handle stdin (raw_input).""" |
|
574 | 567 | if self._rep_channel is None: |
|
575 | 568 | self._rep_channel = self.rep_channel_class(self.context, |
|
576 | 569 | self.session, |
|
577 | 570 | self.rep_address) |
|
578 | 571 | return self._rep_channel |
|
579 | ||
|
580 | @property | |
|
581 | def xreq_address(self): | |
|
582 | return self._xreq_address | |
|
583 | ||
|
584 | @property | |
|
585 | def sub_address(self): | |
|
586 | return self._sub_address | |
|
587 | ||
|
588 | @property | |
|
589 | def rep_address(self): | |
|
590 | return self._rep_address | |
|
591 |
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