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1 | 1 | """An in-process kernel""" |
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2 | 2 | |
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3 | 3 | #----------------------------------------------------------------------------- |
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4 | 4 | # Copyright (C) 2012 The IPython Development Team |
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5 | 5 | # |
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6 | 6 | # Distributed under the terms of the BSD License. The full license is in |
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7 | 7 | # the file COPYING, distributed as part of this software. |
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8 | 8 | #----------------------------------------------------------------------------- |
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9 | 9 | |
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10 | 10 | #----------------------------------------------------------------------------- |
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11 | 11 | # Imports |
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12 | 12 | #----------------------------------------------------------------------------- |
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13 | 13 | |
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14 | 14 | # Standard library imports |
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15 | 15 | from contextlib import contextmanager |
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16 | 16 | import logging |
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17 | 17 | import sys |
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18 | 18 | |
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19 | 19 | # Local imports |
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20 | 20 | from IPython.core.interactiveshell import InteractiveShellABC |
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21 | 21 | from IPython.utils.jsonutil import json_clean |
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22 | 22 | from IPython.utils.traitlets import Any, Enum, Instance, List, Type |
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23 | 23 | from IPython.kernel.zmq.ipkernel import Kernel |
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24 | 24 | from IPython.kernel.zmq.zmqshell import ZMQInteractiveShell |
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25 | 25 | |
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26 | 26 | from .socket import DummySocket |
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27 | 27 | |
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28 | 28 | #----------------------------------------------------------------------------- |
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29 | 29 | # Main kernel class |
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30 | 30 | #----------------------------------------------------------------------------- |
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31 | 31 | |
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32 | 32 | class InProcessKernel(Kernel): |
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33 | 33 | |
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34 | 34 | #------------------------------------------------------------------------- |
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35 | 35 | # InProcessKernel interface |
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36 | 36 | #------------------------------------------------------------------------- |
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37 | 37 | |
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38 | 38 | # The frontends connected to this kernel. |
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39 | 39 | frontends = List( |
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40 | 40 | Instance('IPython.kernel.inprocess.client.InProcessKernelClient') |
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41 | 41 | ) |
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42 | 42 | |
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43 | 43 | # The GUI environment that the kernel is running under. This need not be |
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44 | 44 | # specified for the normal operation for the kernel, but is required for |
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45 | 45 | # IPython's GUI support (including pylab). The default is 'inline' because |
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46 | 46 | # it is safe under all GUI toolkits. |
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47 | 47 | gui = Enum(('tk', 'gtk', 'wx', 'qt', 'qt4', 'inline'), |
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48 | 48 | default_value='inline') |
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49 | 49 | |
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50 | 50 | raw_input_str = Any() |
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51 | 51 | stdout = Any() |
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52 | 52 | stderr = Any() |
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53 | 53 | |
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54 | 54 | #------------------------------------------------------------------------- |
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55 | 55 | # Kernel interface |
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56 | 56 | #------------------------------------------------------------------------- |
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57 | 57 | |
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58 | 58 | shell_class = Type() |
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59 | 59 | shell_streams = List() |
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60 | 60 | control_stream = Any() |
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61 | 61 | iopub_socket = Instance(DummySocket, ()) |
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62 | 62 | stdin_socket = Instance(DummySocket, ()) |
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63 | 63 | |
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64 | 64 | def __init__(self, **traits): |
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65 | 65 | # When an InteractiveShell is instantiated by our base class, it binds |
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66 | 66 | # the current values of sys.stdout and sys.stderr. |
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67 | 67 | with self._redirected_io(): |
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68 | 68 | super(InProcessKernel, self).__init__(**traits) |
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69 | 69 | |
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70 | 70 | self.iopub_socket.on_trait_change(self._io_dispatch, 'message_sent') |
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71 | 71 | self.shell.kernel = self |
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72 | 72 | |
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73 | 73 | def execute_request(self, stream, ident, parent): |
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74 | 74 | """ Override for temporary IO redirection. """ |
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75 | 75 | with self._redirected_io(): |
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76 | 76 | super(InProcessKernel, self).execute_request(stream, ident, parent) |
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77 | 77 | |
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78 | 78 | def start(self): |
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79 | 79 | """ Override registration of dispatchers for streams. """ |
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80 | 80 | self.shell.exit_now = False |
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81 | 81 | |
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82 | 82 | def _abort_queue(self, stream): |
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83 | 83 | """ The in-process kernel doesn't abort requests. """ |
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84 | 84 | pass |
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85 | 85 | |
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86 | 86 | def _raw_input(self, prompt, ident, parent): |
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87 | 87 | # Flush output before making the request. |
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88 | 88 | self.raw_input_str = None |
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89 | 89 | sys.stderr.flush() |
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90 | 90 | sys.stdout.flush() |
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91 | 91 | |
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92 | 92 | # Send the input request. |
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93 | 93 | content = json_clean(dict(prompt=prompt)) |
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94 | 94 | msg = self.session.msg(u'input_request', content, parent) |
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95 | 95 | for frontend in self.frontends: |
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96 | 96 | if frontend.session.session == parent['header']['session']: |
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97 | 97 | frontend.stdin_channel.call_handlers(msg) |
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98 | 98 | break |
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99 | 99 | else: |
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100 | 100 | logging.error('No frontend found for raw_input request') |
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101 | 101 | return str() |
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102 | 102 | |
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103 | 103 | # Await a response. |
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104 | 104 | while self.raw_input_str is None: |
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105 | 105 | frontend.stdin_channel.process_events() |
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106 | 106 | return self.raw_input_str |
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107 | 107 | |
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108 | 108 | #------------------------------------------------------------------------- |
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109 | 109 | # Protected interface |
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110 | 110 | #------------------------------------------------------------------------- |
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111 | 111 | |
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112 | 112 | @contextmanager |
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113 | 113 | def _redirected_io(self): |
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114 | 114 | """ Temporarily redirect IO to the kernel. |
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115 | 115 | """ |
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116 | 116 | sys_stdout, sys_stderr = sys.stdout, sys.stderr |
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117 | 117 | sys.stdout, sys.stderr = self.stdout, self.stderr |
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118 | 118 | yield |
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119 | 119 | sys.stdout, sys.stderr = sys_stdout, sys_stderr |
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120 | 120 | |
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121 | 121 | #------ Trait change handlers -------------------------------------------- |
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122 | 122 | |
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123 | 123 | def _io_dispatch(self): |
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124 | 124 | """ Called when a message is sent to the IO socket. |
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125 | 125 | """ |
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126 | 126 | ident, msg = self.session.recv(self.iopub_socket, copy=False) |
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127 | 127 | for frontend in self.frontends: |
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128 | 128 | frontend.iopub_channel.call_handlers(msg) |
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129 | 129 | |
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130 | 130 | #------ Trait initializers ----------------------------------------------- |
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131 | 131 | |
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132 | 132 | def _log_default(self): |
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133 | 133 | return logging.getLogger(__name__) |
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134 | 134 | |
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135 | 135 | def _session_default(self): |
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136 | 136 | from IPython.kernel.zmq.session import Session |
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137 | 137 | return Session(parent=self) |
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138 | 138 | |
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139 | 139 | def _shell_class_default(self): |
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140 | 140 | return InProcessInteractiveShell |
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141 | 141 | |
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142 | 142 | def _stdout_default(self): |
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143 | 143 | from IPython.kernel.zmq.iostream import OutStream |
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144 | 144 | return OutStream(self.session, self.iopub_socket, u'stdout', pipe=False) |
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145 | 145 | |
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146 | 146 | def _stderr_default(self): |
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147 | 147 | from IPython.kernel.zmq.iostream import OutStream |
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148 | 148 | return OutStream(self.session, self.iopub_socket, u'stderr', pipe=False) |
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149 | 149 | |
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150 | 150 | #----------------------------------------------------------------------------- |
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151 | 151 | # Interactive shell subclass |
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152 | 152 | #----------------------------------------------------------------------------- |
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153 | 153 | |
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154 | 154 | class InProcessInteractiveShell(ZMQInteractiveShell): |
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155 | 155 | |
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156 | 156 | kernel = Instance('IPython.kernel.inprocess.ipkernel.InProcessKernel') |
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157 | 157 | |
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158 | 158 | #------------------------------------------------------------------------- |
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159 | 159 | # InteractiveShell interface |
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160 | 160 | #------------------------------------------------------------------------- |
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161 | 161 | |
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162 | 162 | def enable_gui(self, gui=None): |
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163 | 163 | """Enable GUI integration for the kernel.""" |
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164 | 164 | from IPython.kernel.zmq.eventloops import enable_gui |
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165 | 165 | if not gui: |
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166 | 166 | gui = self.kernel.gui |
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167 | 167 | return enable_gui(gui, kernel=self.kernel) |
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168 | 168 | |
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169 | 169 | def enable_matplotlib(self, gui=None): |
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170 | 170 | """Enable matplotlib integration for the kernel.""" |
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171 | 171 | if not gui: |
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172 | 172 | gui = self.kernel.gui |
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173 |
return super(InProcessInteractiveShell, self).enable_matplotlib( |
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173 | return super(InProcessInteractiveShell, self).enable_matplotlib(gui) | |
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174 | 174 | |
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175 | 175 | def enable_pylab(self, gui=None, import_all=True, welcome_message=False): |
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176 | 176 | """Activate pylab support at runtime.""" |
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177 | 177 | if not gui: |
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178 | 178 | gui = self.kernel.gui |
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179 | 179 | return super(InProcessInteractiveShell, self).enable_pylab(gui, import_all, |
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180 | 180 | welcome_message) |
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181 | 181 | |
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182 | 182 | InteractiveShellABC.register(InProcessInteractiveShell) |
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