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@@ -1,535 +1,547 b'' | |||
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1 | 1 | #!/usr/bin/env python |
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2 | 2 | """A simple interactive kernel that talks to a frontend over 0MQ. |
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3 | 3 | |
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4 | 4 | Things to do: |
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5 | 5 | |
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6 | 6 | * Finish implementing `raw_input`. |
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7 | 7 | * Implement `set_parent` logic. Right before doing exec, the Kernel should |
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8 | 8 | call set_parent on all the PUB objects with the message about to be executed. |
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9 | 9 | * Implement random port and security key logic. |
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10 | 10 | * Implement control messages. |
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11 | 11 | * Implement event loop and poll version. |
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12 | 12 | """ |
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13 | 13 | |
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14 | 14 | #----------------------------------------------------------------------------- |
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15 | 15 | # Imports |
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16 | 16 | #----------------------------------------------------------------------------- |
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17 | 17 | |
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18 | 18 | # Standard library imports. |
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19 | 19 | import __builtin__ |
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20 | 20 | from code import CommandCompiler |
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21 | from cStringIO import StringIO | |
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21 | 22 | import os |
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22 | 23 | import sys |
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23 | 24 | from threading import Thread |
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24 | 25 | import time |
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25 | 26 | import traceback |
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26 | 27 | |
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27 | 28 | # System library imports. |
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28 | 29 | import zmq |
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29 | 30 | |
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30 | 31 | # Local imports. |
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31 | 32 | from IPython.external.argparse import ArgumentParser |
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32 | 33 | from session import Session, Message, extract_header |
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33 | 34 | from completer import KernelCompleter |
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34 | 35 | |
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35 | 36 | #----------------------------------------------------------------------------- |
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36 | 37 | # Kernel and stream classes |
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37 | 38 | #----------------------------------------------------------------------------- |
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38 | 39 | |
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39 | 40 | class InStream(object): |
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40 | 41 | """ A file like object that reads from a 0MQ XREQ socket.""" |
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41 | 42 | |
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42 | 43 | def __init__(self, session, socket): |
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43 | 44 | self.session = session |
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44 | 45 | self.socket = socket |
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45 | 46 | |
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46 | 47 | def close(self): |
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47 | 48 | self.socket = None |
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48 | 49 | |
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49 | 50 | def flush(self): |
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50 | 51 | if self.socket is None: |
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51 | 52 | raise ValueError('I/O operation on closed file') |
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52 | 53 | |
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53 | 54 | def isatty(self): |
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54 | 55 | return False |
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55 | 56 | |
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56 | 57 | def next(self): |
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57 | 58 | raise IOError('Seek not supported.') |
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58 | 59 | |
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59 | 60 | def read(self, size=-1): |
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60 | 61 | # FIXME: Do we want another request for this? |
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61 | 62 | string = '\n'.join(self.readlines()) |
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62 | 63 | return self._truncate(string, size) |
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63 | 64 | |
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64 | 65 | def readline(self, size=-1): |
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65 | 66 | if self.socket is None: |
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66 | 67 | raise ValueError('I/O operation on closed file') |
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67 | 68 | else: |
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68 | 69 | content = dict(size=size) |
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69 | 70 | msg = self.session.msg('readline_request', content=content) |
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70 | 71 | reply = self._request(msg) |
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71 | 72 | line = reply['content']['line'] |
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72 | 73 | return self._truncate(line, size) |
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73 | 74 | |
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74 | 75 | def readlines(self, sizehint=-1): |
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75 | 76 | # Sizehint is ignored, as is permitted. |
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76 | 77 | if self.socket is None: |
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77 | 78 | raise ValueError('I/O operation on closed file') |
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78 | 79 | else: |
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79 | 80 | lines = [] |
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80 | 81 | while True: |
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81 | 82 | line = self.readline() |
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82 | 83 | if line: |
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83 | 84 | lines.append(line) |
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84 | 85 | else: |
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85 | 86 | break |
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86 | 87 | return lines |
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87 | 88 | |
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88 | 89 | def seek(self, offset, whence=None): |
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89 | 90 | raise IOError('Seek not supported.') |
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90 | 91 | |
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91 | 92 | def write(self, string): |
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92 | 93 | raise IOError('Write not supported on a read only stream.') |
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93 | 94 | |
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94 | 95 | def writelines(self, sequence): |
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95 | 96 | raise IOError('Write not supported on a read only stream.') |
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96 | 97 | |
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97 | 98 | def _request(self, msg): |
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98 | 99 | # Flush output before making the request. This ensures, for example, |
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99 | 100 | # that raw_input(prompt) actually gets a prompt written. |
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100 | 101 | sys.stderr.flush() |
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101 | 102 | sys.stdout.flush() |
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102 | 103 | |
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103 | 104 | self.socket.send_json(msg) |
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104 | 105 | while True: |
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105 | 106 | try: |
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106 | 107 | reply = self.socket.recv_json(zmq.NOBLOCK) |
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107 | 108 | except zmq.ZMQError, e: |
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108 | 109 | if e.errno == zmq.EAGAIN: |
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109 | 110 | pass |
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110 | 111 | else: |
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111 | 112 | raise |
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112 | 113 | else: |
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113 | 114 | break |
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114 | 115 | return reply |
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115 | 116 | |
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116 | 117 | def _truncate(self, string, size): |
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117 | 118 | if size >= 0: |
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118 | 119 | if isinstance(string, str): |
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119 | 120 | return string[:size] |
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120 | 121 | elif isinstance(string, unicode): |
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121 | 122 | encoded = string.encode('utf-8')[:size] |
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122 | 123 | return encoded.decode('utf-8', 'ignore') |
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123 | 124 | return string |
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124 | 125 | |
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125 | 126 | |
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126 | 127 | class OutStream(object): |
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127 | 128 | """A file like object that publishes the stream to a 0MQ PUB socket.""" |
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128 | 129 | |
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129 | def __init__(self, session, pub_socket, name, max_buffer=200): | |
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130 | # The time interval between automatic flushes, in seconds. | |
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131 | flush_interval = 0.05 | |
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132 | ||
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133 | def __init__(self, session, pub_socket, name): | |
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130 | 134 | self.session = session |
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131 | 135 | self.pub_socket = pub_socket |
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132 | 136 | self.name = name |
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133 | self._buffer = [] | |
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134 | self._buffer_len = 0 | |
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135 | self.max_buffer = max_buffer | |
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136 | 137 | self.parent_header = {} |
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138 | self._new_buffer() | |
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137 | 139 | |
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138 | 140 | def set_parent(self, parent): |
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139 | 141 | self.parent_header = extract_header(parent) |
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140 | 142 | |
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141 | 143 | def close(self): |
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142 | 144 | self.pub_socket = None |
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143 | 145 | |
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144 | 146 | def flush(self): |
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145 | 147 | if self.pub_socket is None: |
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146 | 148 | raise ValueError(u'I/O operation on closed file') |
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147 | 149 | else: |
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148 |
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149 | data = ''.join(self._buffer) | |
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150 | data = self._buffer.getvalue() | |
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151 | if data: | |
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150 | 152 | content = {u'name':self.name, u'data':data} |
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151 | 153 | msg = self.session.msg(u'stream', content=content, |
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152 | 154 | parent=self.parent_header) |
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153 | 155 | print>>sys.__stdout__, Message(msg) |
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154 | 156 | self.pub_socket.send_json(msg) |
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155 |
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156 |
self._buffer |
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157 | ||
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158 | self._buffer.close() | |
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159 | self._new_buffer() | |
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157 | 160 | |
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158 | 161 | def isatty(self): |
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159 | 162 | return False |
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160 | 163 | |
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161 | 164 | def next(self): |
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162 | 165 | raise IOError('Read not supported on a write only stream.') |
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163 | 166 | |
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164 |
def read(self, size= |
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167 | def read(self, size=-1): | |
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165 | 168 | raise IOError('Read not supported on a write only stream.') |
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166 | 169 | |
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167 | readline=read | |
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170 | def readline(self, size=-1): | |
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171 | raise IOError('Read not supported on a write only stream.') | |
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168 | 172 | |
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169 | def write(self, s): | |
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173 | def write(self, string): | |
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170 | 174 | if self.pub_socket is None: |
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171 | 175 | raise ValueError('I/O operation on closed file') |
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172 | 176 | else: |
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173 |
self._buffer. |
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174 | self._buffer_len += len(s) | |
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175 |
self._ |
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176 | ||
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177 | def _maybe_send(self): | |
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178 | if '\n' in self._buffer[-1]: | |
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179 | self.flush() | |
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180 | if self._buffer_len > self.max_buffer: | |
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181 | self.flush() | |
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177 | self._buffer.write(string) | |
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178 | current_time = time.time() | |
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179 | if self._start <= 0: | |
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180 | self._start = current_time | |
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181 | elif current_time - self._start > self.flush_interval: | |
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182 | self.flush() | |
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182 | 183 | |
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183 | 184 | def writelines(self, sequence): |
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184 | 185 | if self.pub_socket is None: |
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185 | 186 | raise ValueError('I/O operation on closed file') |
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186 | 187 | else: |
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187 | for s in sequence: | |
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188 | self.write(s) | |
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188 | for string in sequence: | |
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189 | self.write(string) | |
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190 | ||
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191 | def _new_buffer(self): | |
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192 | self._buffer = StringIO() | |
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193 | self._start = -1 | |
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189 | 194 | |
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190 | 195 | |
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191 | 196 | class DisplayHook(object): |
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192 | 197 | |
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193 | 198 | def __init__(self, session, pub_socket): |
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194 | 199 | self.session = session |
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195 | 200 | self.pub_socket = pub_socket |
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196 | 201 | self.parent_header = {} |
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197 | 202 | |
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198 | 203 | def __call__(self, obj): |
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199 | 204 | if obj is None: |
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200 | 205 | return |
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201 | 206 | |
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202 | 207 | __builtin__._ = obj |
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203 | 208 | msg = self.session.msg(u'pyout', {u'data':repr(obj)}, |
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204 | 209 | parent=self.parent_header) |
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205 | 210 | self.pub_socket.send_json(msg) |
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206 | 211 | |
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207 | 212 | def set_parent(self, parent): |
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208 | 213 | self.parent_header = extract_header(parent) |
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209 | 214 | |
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210 | 215 | |
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211 | 216 | class Kernel(object): |
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212 | 217 | |
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213 | 218 | def __init__(self, session, reply_socket, pub_socket): |
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214 | 219 | self.session = session |
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215 | 220 | self.reply_socket = reply_socket |
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216 | 221 | self.pub_socket = pub_socket |
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217 | 222 | self.user_ns = {} |
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218 | 223 | self.history = [] |
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219 | 224 | self.compiler = CommandCompiler() |
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220 | 225 | self.completer = KernelCompleter(self.user_ns) |
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221 | 226 | |
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222 | 227 | # Build dict of handlers for message types |
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223 | 228 | msg_types = [ 'execute_request', 'complete_request', |
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224 | 229 | 'object_info_request' ] |
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225 | 230 | self.handlers = {} |
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226 | 231 | for msg_type in msg_types: |
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227 | 232 | self.handlers[msg_type] = getattr(self, msg_type) |
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228 | 233 | |
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229 | 234 | def abort_queue(self): |
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230 | 235 | while True: |
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231 | 236 | try: |
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232 | 237 | ident = self.reply_socket.recv(zmq.NOBLOCK) |
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233 | 238 | except zmq.ZMQError, e: |
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234 | 239 | if e.errno == zmq.EAGAIN: |
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235 | 240 | break |
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236 | 241 | else: |
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237 | 242 | assert self.reply_socket.rcvmore(), "Unexpected missing message part." |
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238 | 243 | msg = self.reply_socket.recv_json() |
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239 | 244 | print>>sys.__stdout__, "Aborting:" |
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240 | 245 | print>>sys.__stdout__, Message(msg) |
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241 | 246 | msg_type = msg['msg_type'] |
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242 | 247 | reply_type = msg_type.split('_')[0] + '_reply' |
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243 | 248 | reply_msg = self.session.msg(reply_type, {'status' : 'aborted'}, msg) |
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244 | 249 | print>>sys.__stdout__, Message(reply_msg) |
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245 | 250 | self.reply_socket.send(ident,zmq.SNDMORE) |
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246 | 251 | self.reply_socket.send_json(reply_msg) |
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247 | 252 | # We need to wait a bit for requests to come in. This can probably |
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248 | 253 | # be set shorter for true asynchronous clients. |
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249 | 254 | time.sleep(0.1) |
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250 | 255 | |
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251 | 256 | def execute_request(self, ident, parent): |
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252 | 257 | try: |
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253 | 258 | code = parent[u'content'][u'code'] |
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254 | 259 | except: |
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255 | 260 | print>>sys.__stderr__, "Got bad msg: " |
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256 | 261 | print>>sys.__stderr__, Message(parent) |
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257 | 262 | return |
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258 | 263 | pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent) |
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259 | 264 | self.pub_socket.send_json(pyin_msg) |
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265 | ||
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260 | 266 | try: |
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261 | 267 | comp_code = self.compiler(code, '<zmq-kernel>') |
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262 | 268 | sys.displayhook.set_parent(parent) |
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263 | 269 | exec comp_code in self.user_ns, self.user_ns |
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264 | 270 | except: |
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265 | 271 | result = u'error' |
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266 | 272 | etype, evalue, tb = sys.exc_info() |
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267 | 273 | tb = traceback.format_exception(etype, evalue, tb) |
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268 | 274 | exc_content = { |
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269 | 275 | u'status' : u'error', |
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270 | 276 | u'traceback' : tb, |
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271 | 277 | u'ename' : unicode(etype.__name__), |
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272 | 278 | u'evalue' : unicode(evalue) |
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273 | 279 | } |
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274 | 280 | exc_msg = self.session.msg(u'pyerr', exc_content, parent) |
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275 | 281 | self.pub_socket.send_json(exc_msg) |
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276 | 282 | reply_content = exc_content |
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277 | 283 | else: |
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278 | 284 | reply_content = {'status' : 'ok'} |
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285 | ||
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286 | # Flush output before sending the reply. | |
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287 | sys.stderr.flush() | |
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288 | sys.stdout.flush() | |
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289 | ||
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290 | # Send the reply. | |
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279 | 291 | reply_msg = self.session.msg(u'execute_reply', reply_content, parent) |
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280 | 292 | print>>sys.__stdout__, Message(reply_msg) |
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281 | 293 | self.reply_socket.send(ident, zmq.SNDMORE) |
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282 | 294 | self.reply_socket.send_json(reply_msg) |
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283 | 295 | if reply_msg['content']['status'] == u'error': |
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284 | 296 | self.abort_queue() |
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285 | 297 | |
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286 | 298 | def complete_request(self, ident, parent): |
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287 | 299 | matches = {'matches' : self.complete(parent), |
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288 | 300 | 'status' : 'ok'} |
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289 | 301 | completion_msg = self.session.send(self.reply_socket, 'complete_reply', |
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290 | 302 | matches, parent, ident) |
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291 | 303 | print >> sys.__stdout__, completion_msg |
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292 | 304 | |
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293 | 305 | def complete(self, msg): |
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294 | 306 | return self.completer.complete(msg.content.line, msg.content.text) |
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295 | 307 | |
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296 | 308 | def object_info_request(self, ident, parent): |
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297 | 309 | context = parent['content']['oname'].split('.') |
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298 | 310 | object_info = self.object_info(context) |
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299 | 311 | msg = self.session.send(self.reply_socket, 'object_info_reply', |
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300 | 312 | object_info, parent, ident) |
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301 | 313 | print >> sys.__stdout__, msg |
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302 | 314 | |
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303 | 315 | def object_info(self, context): |
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304 | 316 | symbol, leftover = self.symbol_from_context(context) |
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305 | 317 | if symbol is not None and not leftover: |
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306 | 318 | doc = getattr(symbol, '__doc__', '') |
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307 | 319 | else: |
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308 | 320 | doc = '' |
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309 | 321 | object_info = dict(docstring = doc) |
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310 | 322 | return object_info |
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311 | 323 | |
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312 | 324 | def symbol_from_context(self, context): |
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313 | 325 | if not context: |
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314 | 326 | return None, context |
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315 | 327 | |
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316 | 328 | base_symbol_string = context[0] |
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317 | 329 | symbol = self.user_ns.get(base_symbol_string, None) |
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318 | 330 | if symbol is None: |
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319 | 331 | symbol = __builtin__.__dict__.get(base_symbol_string, None) |
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320 | 332 | if symbol is None: |
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321 | 333 | return None, context |
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322 | 334 | |
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323 | 335 | context = context[1:] |
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324 | 336 | for i, name in enumerate(context): |
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325 | 337 | new_symbol = getattr(symbol, name, None) |
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326 | 338 | if new_symbol is None: |
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327 | 339 | return symbol, context[i:] |
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328 | 340 | else: |
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329 | 341 | symbol = new_symbol |
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330 | 342 | |
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331 | 343 | return symbol, [] |
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332 | 344 | |
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333 | 345 | def start(self): |
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334 | 346 | while True: |
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335 | 347 | ident = self.reply_socket.recv() |
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336 | 348 | assert self.reply_socket.rcvmore(), "Unexpected missing message part." |
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337 | 349 | msg = self.reply_socket.recv_json() |
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338 | 350 | omsg = Message(msg) |
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339 | 351 | print>>sys.__stdout__ |
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340 | 352 | print>>sys.__stdout__, omsg |
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341 | 353 | handler = self.handlers.get(omsg.msg_type, None) |
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342 | 354 | if handler is None: |
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343 | 355 | print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg |
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344 | 356 | else: |
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345 | 357 | handler(ident, omsg) |
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346 | 358 | |
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347 | 359 | #----------------------------------------------------------------------------- |
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348 | 360 | # Kernel main and launch functions |
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349 | 361 | #----------------------------------------------------------------------------- |
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350 | 362 | |
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351 | 363 | class ExitPollerUnix(Thread): |
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352 | 364 | """ A Unix-specific daemon thread that terminates the program immediately |
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353 | 365 | when this process' parent process no longer exists. |
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354 | 366 | """ |
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355 | 367 | |
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356 | 368 | def __init__(self): |
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357 | 369 | super(ExitPollerUnix, self).__init__() |
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358 | 370 | self.daemon = True |
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359 | 371 | |
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360 | 372 | def run(self): |
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361 | 373 | # We cannot use os.waitpid because it works only for child processes. |
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362 | 374 | from errno import EINTR |
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363 | 375 | while True: |
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364 | 376 | try: |
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365 | 377 | if os.getppid() == 1: |
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366 | 378 | os._exit(1) |
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367 | 379 | time.sleep(1.0) |
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368 | 380 | except OSError, e: |
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369 | 381 | if e.errno == EINTR: |
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370 | 382 | continue |
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371 | 383 | raise |
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372 | 384 | |
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373 | 385 | class ExitPollerWindows(Thread): |
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374 | 386 | """ A Windows-specific daemon thread that terminates the program immediately |
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375 | 387 | when a Win32 handle is signaled. |
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376 | 388 | """ |
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377 | 389 | |
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378 | 390 | def __init__(self, handle): |
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379 | 391 | super(ExitPollerWindows, self).__init__() |
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380 | 392 | self.daemon = True |
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381 | 393 | self.handle = handle |
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382 | 394 | |
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383 | 395 | def run(self): |
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384 | 396 | from _subprocess import WaitForSingleObject, WAIT_OBJECT_0, INFINITE |
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385 | 397 | result = WaitForSingleObject(self.handle, INFINITE) |
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386 | 398 | if result == WAIT_OBJECT_0: |
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387 | 399 | os._exit(1) |
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388 | 400 | |
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389 | 401 | |
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390 | 402 | def bind_port(socket, ip, port): |
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391 | 403 | """ Binds the specified ZMQ socket. If the port is less than zero, a random |
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392 | 404 | port is chosen. Returns the port that was bound. |
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393 | 405 | """ |
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394 | 406 | connection = 'tcp://%s' % ip |
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395 | 407 | if port <= 0: |
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396 | 408 | port = socket.bind_to_random_port(connection) |
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397 | 409 | else: |
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398 | 410 | connection += ':%i' % port |
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399 | 411 | socket.bind(connection) |
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400 | 412 | return port |
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401 | 413 | |
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402 | 414 | |
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403 | 415 | def main(): |
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404 | 416 | """ Main entry point for launching a kernel. |
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405 | 417 | """ |
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406 | 418 | # Parse command line arguments. |
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407 | 419 | parser = ArgumentParser() |
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408 | 420 | parser.add_argument('--ip', type=str, default='127.0.0.1', |
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409 | 421 | help='set the kernel\'s IP address [default: local]') |
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410 | 422 | parser.add_argument('--xrep', type=int, metavar='PORT', default=0, |
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411 | 423 | help='set the XREP channel port [default: random]') |
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412 | 424 | parser.add_argument('--pub', type=int, metavar='PORT', default=0, |
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413 | 425 | help='set the PUB channel port [default: random]') |
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414 | 426 | parser.add_argument('--req', type=int, metavar='PORT', default=0, |
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415 | 427 | help='set the REQ channel port [default: random]') |
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416 | 428 | if sys.platform == 'win32': |
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417 | 429 | parser.add_argument('--parent', type=int, metavar='HANDLE', |
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418 | 430 | default=0, help='kill this process if the process ' |
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419 | 431 | 'with HANDLE dies') |
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420 | 432 | else: |
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421 | 433 | parser.add_argument('--parent', action='store_true', |
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422 | 434 | help='kill this process if its parent dies') |
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423 | 435 | namespace = parser.parse_args() |
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424 | 436 | |
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425 | 437 | # Create a context, a session, and the kernel sockets. |
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426 | 438 | print >>sys.__stdout__, "Starting the kernel..." |
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427 | 439 | context = zmq.Context() |
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428 | 440 | session = Session(username=u'kernel') |
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429 | 441 | |
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430 | 442 | reply_socket = context.socket(zmq.XREP) |
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431 | 443 | xrep_port = bind_port(reply_socket, namespace.ip, namespace.xrep) |
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432 | 444 | print >>sys.__stdout__, "XREP Channel on port", xrep_port |
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433 | 445 | |
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434 | 446 | pub_socket = context.socket(zmq.PUB) |
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435 | 447 | pub_port = bind_port(pub_socket, namespace.ip, namespace.pub) |
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436 | 448 | print >>sys.__stdout__, "PUB Channel on port", pub_port |
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437 | 449 | |
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438 | 450 | req_socket = context.socket(zmq.XREQ) |
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439 | 451 | req_port = bind_port(req_socket, namespace.ip, namespace.req) |
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440 | 452 | print >>sys.__stdout__, "REQ Channel on port", req_port |
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441 | 453 | |
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442 | 454 | # Redirect input streams and set a display hook. |
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443 | 455 | sys.stdin = InStream(session, req_socket) |
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444 | 456 | sys.stdout = OutStream(session, pub_socket, u'stdout') |
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445 | 457 | sys.stderr = OutStream(session, pub_socket, u'stderr') |
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446 | 458 | sys.displayhook = DisplayHook(session, pub_socket) |
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447 | 459 | |
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448 | 460 | # Create the kernel. |
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449 | 461 | kernel = Kernel(session, reply_socket, pub_socket) |
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450 | 462 | |
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451 | 463 | # Configure this kernel/process to die on parent termination, if necessary. |
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452 | 464 | if namespace.parent: |
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453 | 465 | if sys.platform == 'win32': |
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454 | 466 | poller = ExitPollerWindows(namespace.parent) |
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455 | 467 | else: |
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456 | 468 | poller = ExitPollerUnix() |
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457 | 469 | poller.start() |
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458 | 470 | |
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459 | 471 | # Start the kernel mainloop. |
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460 | 472 | kernel.start() |
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461 | 473 | |
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462 | 474 | |
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463 | 475 | def launch_kernel(xrep_port=0, pub_port=0, req_port=0, independent=False): |
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464 | 476 | """ Launches a localhost kernel, binding to the specified ports. |
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465 | 477 | |
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466 | 478 | Parameters |
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467 | 479 | ---------- |
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468 | 480 | xrep_port : int, optional |
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469 | 481 | The port to use for XREP channel. |
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470 | 482 | |
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471 | 483 | pub_port : int, optional |
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472 | 484 | The port to use for the SUB channel. |
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473 | 485 | |
|
474 | 486 | req_port : int, optional |
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475 | 487 | The port to use for the REQ (raw input) channel. |
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476 | 488 | |
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477 | 489 | independent : bool, optional (default False) |
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478 | 490 | If set, the kernel process is guaranteed to survive if this process |
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479 | 491 | dies. If not set, an effort is made to ensure that the kernel is killed |
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480 | 492 | when this process dies. Note that in this case it is still good practice |
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481 | 493 | to kill kernels manually before exiting. |
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482 | 494 | |
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483 | 495 | Returns |
|
484 | 496 | ------- |
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485 | 497 | A tuple of form: |
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486 | 498 | (kernel_process, xrep_port, pub_port, req_port) |
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487 | 499 | where kernel_process is a Popen object and the ports are integers. |
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488 | 500 | """ |
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489 | 501 | import socket |
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490 | 502 | from subprocess import Popen |
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491 | 503 | |
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492 | 504 | # Find open ports as necessary. |
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493 | 505 | ports = [] |
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494 | 506 | ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + int(req_port <= 0) |
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495 | 507 | for i in xrange(ports_needed): |
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496 | 508 | sock = socket.socket() |
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497 | 509 | sock.bind(('', 0)) |
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498 | 510 | ports.append(sock) |
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499 | 511 | for i, sock in enumerate(ports): |
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500 | 512 | port = sock.getsockname()[1] |
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501 | 513 | sock.close() |
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502 | 514 | ports[i] = port |
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503 | 515 | if xrep_port <= 0: |
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504 | 516 | xrep_port = ports.pop(0) |
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505 | 517 | if pub_port <= 0: |
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506 | 518 | pub_port = ports.pop(0) |
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507 | 519 | if req_port <= 0: |
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508 | 520 | req_port = ports.pop(0) |
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509 | 521 | |
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510 | 522 | # Spawn a kernel. |
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511 | 523 | command = 'from IPython.zmq.kernel import main; main()' |
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512 | 524 | arguments = [ sys.executable, '-c', command, '--xrep', str(xrep_port), |
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513 | 525 | '--pub', str(pub_port), '--req', str(req_port) ] |
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514 | 526 | if independent: |
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515 | 527 | if sys.platform == 'win32': |
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516 | 528 | proc = Popen(['start', '/b'] + arguments, shell=True) |
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517 | 529 | else: |
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518 | 530 | proc = Popen(arguments, preexec_fn=lambda: os.setsid()) |
|
519 | 531 | else: |
|
520 | 532 | if sys.platform == 'win32': |
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521 | 533 | from _subprocess import DuplicateHandle, GetCurrentProcess, \ |
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522 | 534 | DUPLICATE_SAME_ACCESS |
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523 | 535 | pid = GetCurrentProcess() |
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524 | 536 | handle = DuplicateHandle(pid, pid, pid, 0, |
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525 | 537 | True, # Inheritable by new processes. |
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526 | 538 | DUPLICATE_SAME_ACCESS) |
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527 | 539 | proc = Popen(arguments + ['--parent', str(int(handle))]) |
|
528 | 540 | else: |
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529 | 541 | proc = Popen(arguments + ['--parent']) |
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530 | 542 | |
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531 | 543 | return proc, xrep_port, pub_port, req_port |
|
532 | 544 | |
|
533 | 545 | |
|
534 | 546 | if __name__ == '__main__': |
|
535 | 547 | main() |
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