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@@ -1,892 +1,899 b'' | |||||
1 | """Base classes to manage the interaction with a running kernel. |
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1 | """Base classes to manage the interaction with a running kernel. | |
2 |
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2 | |||
3 | TODO |
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3 | TODO | |
4 | * Create logger to handle debugging and console messages. |
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4 | * Create logger to handle debugging and console messages. | |
5 | """ |
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5 | """ | |
6 |
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6 | |||
7 | #----------------------------------------------------------------------------- |
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7 | #----------------------------------------------------------------------------- | |
8 | # Copyright (C) 2008-2010 The IPython Development Team |
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8 | # Copyright (C) 2008-2010 The IPython Development Team | |
9 | # |
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9 | # | |
10 | # Distributed under the terms of the BSD License. The full license is in |
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10 | # Distributed under the terms of the BSD License. The full license is in | |
11 | # the file COPYING, distributed as part of this software. |
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11 | # the file COPYING, distributed as part of this software. | |
12 | #----------------------------------------------------------------------------- |
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12 | #----------------------------------------------------------------------------- | |
13 |
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13 | |||
14 | #----------------------------------------------------------------------------- |
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14 | #----------------------------------------------------------------------------- | |
15 | # Imports |
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15 | # Imports | |
16 | #----------------------------------------------------------------------------- |
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16 | #----------------------------------------------------------------------------- | |
17 |
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17 | |||
18 | # Standard library imports. |
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18 | # Standard library imports. | |
19 | from Queue import Queue, Empty |
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19 | from Queue import Queue, Empty | |
20 | from subprocess import Popen |
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20 | from subprocess import Popen | |
21 | import signal |
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21 | import signal | |
22 | import sys |
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22 | import sys | |
23 | from threading import Thread |
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23 | from threading import Thread | |
24 | import time |
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24 | import time | |
25 |
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25 | |||
26 | # System library imports. |
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26 | # System library imports. | |
27 | import zmq |
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27 | import zmq | |
28 | from zmq import POLLIN, POLLOUT, POLLERR |
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28 | from zmq import POLLIN, POLLOUT, POLLERR | |
29 | from zmq.eventloop import ioloop |
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29 | from zmq.eventloop import ioloop | |
30 |
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30 | |||
31 | # Local imports. |
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31 | # Local imports. | |
32 | from IPython.utils import io |
|
32 | from IPython.utils import io | |
33 | from IPython.utils.traitlets import HasTraits, Any, Instance, Type, TCPAddress |
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33 | from IPython.utils.traitlets import HasTraits, Any, Instance, Type, TCPAddress | |
34 | from session import Session |
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34 | from session import Session | |
35 |
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35 | |||
36 | #----------------------------------------------------------------------------- |
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36 | #----------------------------------------------------------------------------- | |
37 | # Constants and exceptions |
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37 | # Constants and exceptions | |
38 | #----------------------------------------------------------------------------- |
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38 | #----------------------------------------------------------------------------- | |
39 |
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39 | |||
40 | LOCALHOST = '127.0.0.1' |
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40 | LOCALHOST = '127.0.0.1' | |
41 |
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41 | |||
42 | class InvalidPortNumber(Exception): |
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42 | class InvalidPortNumber(Exception): | |
43 | pass |
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43 | pass | |
44 |
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44 | |||
45 | #----------------------------------------------------------------------------- |
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45 | #----------------------------------------------------------------------------- | |
46 | # Utility functions |
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46 | # Utility functions | |
47 | #----------------------------------------------------------------------------- |
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47 | #----------------------------------------------------------------------------- | |
48 |
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48 | |||
49 | # some utilities to validate message structure, these might get moved elsewhere |
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49 | # some utilities to validate message structure, these might get moved elsewhere | |
50 | # if they prove to have more generic utility |
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50 | # if they prove to have more generic utility | |
51 |
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51 | |||
52 | def validate_string_list(lst): |
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52 | def validate_string_list(lst): | |
53 | """Validate that the input is a list of strings. |
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53 | """Validate that the input is a list of strings. | |
54 |
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54 | |||
55 | Raises ValueError if not.""" |
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55 | Raises ValueError if not.""" | |
56 | if not isinstance(lst, list): |
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56 | if not isinstance(lst, list): | |
57 | raise ValueError('input %r must be a list' % lst) |
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57 | raise ValueError('input %r must be a list' % lst) | |
58 | for x in lst: |
|
58 | for x in lst: | |
59 | if not isinstance(x, basestring): |
|
59 | if not isinstance(x, basestring): | |
60 | raise ValueError('element %r in list must be a string' % x) |
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60 | raise ValueError('element %r in list must be a string' % x) | |
61 |
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61 | |||
62 |
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62 | |||
63 | def validate_string_dict(dct): |
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63 | def validate_string_dict(dct): | |
64 | """Validate that the input is a dict with string keys and values. |
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64 | """Validate that the input is a dict with string keys and values. | |
65 |
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65 | |||
66 | Raises ValueError if not.""" |
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66 | Raises ValueError if not.""" | |
67 | for k,v in dct.iteritems(): |
|
67 | for k,v in dct.iteritems(): | |
68 | if not isinstance(k, basestring): |
|
68 | if not isinstance(k, basestring): | |
69 | raise ValueError('key %r in dict must be a string' % k) |
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69 | raise ValueError('key %r in dict must be a string' % k) | |
70 | if not isinstance(v, basestring): |
|
70 | if not isinstance(v, basestring): | |
71 | raise ValueError('value %r in dict must be a string' % v) |
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71 | raise ValueError('value %r in dict must be a string' % v) | |
72 |
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72 | |||
73 |
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73 | |||
74 | #----------------------------------------------------------------------------- |
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74 | #----------------------------------------------------------------------------- | |
75 | # ZMQ Socket Channel classes |
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75 | # ZMQ Socket Channel classes | |
76 | #----------------------------------------------------------------------------- |
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76 | #----------------------------------------------------------------------------- | |
77 |
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77 | |||
78 | class ZmqSocketChannel(Thread): |
|
78 | class ZmqSocketChannel(Thread): | |
79 | """The base class for the channels that use ZMQ sockets. |
|
79 | """The base class for the channels that use ZMQ sockets. | |
80 | """ |
|
80 | """ | |
81 | context = None |
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81 | context = None | |
82 | session = None |
|
82 | session = None | |
83 | socket = None |
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83 | socket = None | |
84 | ioloop = None |
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84 | ioloop = None | |
85 | iostate = None |
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85 | iostate = None | |
86 | _address = None |
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86 | _address = None | |
87 |
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87 | |||
88 | def __init__(self, context, session, address): |
|
88 | def __init__(self, context, session, address): | |
89 | """Create a channel |
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89 | """Create a channel | |
90 |
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90 | |||
91 | Parameters |
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91 | Parameters | |
92 | ---------- |
|
92 | ---------- | |
93 | context : :class:`zmq.Context` |
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93 | context : :class:`zmq.Context` | |
94 | The ZMQ context to use. |
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94 | The ZMQ context to use. | |
95 | session : :class:`session.Session` |
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95 | session : :class:`session.Session` | |
96 | The session to use. |
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96 | The session to use. | |
97 | address : tuple |
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97 | address : tuple | |
98 | Standard (ip, port) tuple that the kernel is listening on. |
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98 | Standard (ip, port) tuple that the kernel is listening on. | |
99 | """ |
|
99 | """ | |
100 | super(ZmqSocketChannel, self).__init__() |
|
100 | super(ZmqSocketChannel, self).__init__() | |
101 | self.daemon = True |
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101 | self.daemon = True | |
102 |
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102 | |||
103 | self.context = context |
|
103 | self.context = context | |
104 | self.session = session |
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104 | self.session = session | |
105 | if address[1] == 0: |
|
105 | if address[1] == 0: | |
106 | message = 'The port number for a channel cannot be 0.' |
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106 | message = 'The port number for a channel cannot be 0.' | |
107 | raise InvalidPortNumber(message) |
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107 | raise InvalidPortNumber(message) | |
108 | self._address = address |
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108 | self._address = address | |
109 |
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109 | |||
110 | def stop(self): |
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110 | def stop(self): | |
111 | """Stop the channel's activity. |
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111 | """Stop the channel's activity. | |
112 |
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112 | |||
113 | This calls :method:`Thread.join` and returns when the thread |
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113 | This calls :method:`Thread.join` and returns when the thread | |
114 | terminates. :class:`RuntimeError` will be raised if |
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114 | terminates. :class:`RuntimeError` will be raised if | |
115 | :method:`self.start` is called again. |
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115 | :method:`self.start` is called again. | |
116 | """ |
|
116 | """ | |
117 | self.join() |
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117 | self.join() | |
118 |
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118 | |||
119 | @property |
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119 | @property | |
120 | def address(self): |
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120 | def address(self): | |
121 | """Get the channel's address as an (ip, port) tuple. |
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121 | """Get the channel's address as an (ip, port) tuple. | |
122 |
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122 | |||
123 | By the default, the address is (localhost, 0), where 0 means a random |
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123 | By the default, the address is (localhost, 0), where 0 means a random | |
124 | port. |
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124 | port. | |
125 | """ |
|
125 | """ | |
126 | return self._address |
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126 | return self._address | |
127 |
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127 | |||
128 | def add_io_state(self, state): |
|
128 | def add_io_state(self, state): | |
129 | """Add IO state to the eventloop. |
|
129 | """Add IO state to the eventloop. | |
130 |
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130 | |||
131 | Parameters |
|
131 | Parameters | |
132 | ---------- |
|
132 | ---------- | |
133 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
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133 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR | |
134 | The IO state flag to set. |
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134 | The IO state flag to set. | |
135 |
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135 | |||
136 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
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136 | This is thread safe as it uses the thread safe IOLoop.add_callback. | |
137 | """ |
|
137 | """ | |
138 | def add_io_state_callback(): |
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138 | def add_io_state_callback(): | |
139 | if not self.iostate & state: |
|
139 | if not self.iostate & state: | |
140 | self.iostate = self.iostate | state |
|
140 | self.iostate = self.iostate | state | |
141 | self.ioloop.update_handler(self.socket, self.iostate) |
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141 | self.ioloop.update_handler(self.socket, self.iostate) | |
142 | self.ioloop.add_callback(add_io_state_callback) |
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142 | self.ioloop.add_callback(add_io_state_callback) | |
143 |
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143 | |||
144 | def drop_io_state(self, state): |
|
144 | def drop_io_state(self, state): | |
145 | """Drop IO state from the eventloop. |
|
145 | """Drop IO state from the eventloop. | |
146 |
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146 | |||
147 | Parameters |
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147 | Parameters | |
148 | ---------- |
|
148 | ---------- | |
149 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
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149 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR | |
150 | The IO state flag to set. |
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150 | The IO state flag to set. | |
151 |
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151 | |||
152 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
|
152 | This is thread safe as it uses the thread safe IOLoop.add_callback. | |
153 | """ |
|
153 | """ | |
154 | def drop_io_state_callback(): |
|
154 | def drop_io_state_callback(): | |
155 | if self.iostate & state: |
|
155 | if self.iostate & state: | |
156 | self.iostate = self.iostate & (~state) |
|
156 | self.iostate = self.iostate & (~state) | |
157 | self.ioloop.update_handler(self.socket, self.iostate) |
|
157 | self.ioloop.update_handler(self.socket, self.iostate) | |
158 | self.ioloop.add_callback(drop_io_state_callback) |
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158 | self.ioloop.add_callback(drop_io_state_callback) | |
159 |
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159 | |||
160 |
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160 | |||
161 | class XReqSocketChannel(ZmqSocketChannel): |
|
161 | class XReqSocketChannel(ZmqSocketChannel): | |
162 | """The XREQ channel for issues request/replies to the kernel. |
|
162 | """The XREQ channel for issues request/replies to the kernel. | |
163 | """ |
|
163 | """ | |
164 |
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164 | |||
165 | command_queue = None |
|
165 | command_queue = None | |
166 |
|
166 | |||
167 | def __init__(self, context, session, address): |
|
167 | def __init__(self, context, session, address): | |
168 | super(XReqSocketChannel, self).__init__(context, session, address) |
|
168 | super(XReqSocketChannel, self).__init__(context, session, address) | |
169 | self.command_queue = Queue() |
|
169 | self.command_queue = Queue() | |
170 | self.ioloop = ioloop.IOLoop() |
|
170 | self.ioloop = ioloop.IOLoop() | |
171 |
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171 | |||
172 | def run(self): |
|
172 | def run(self): | |
173 | """The thread's main activity. Call start() instead.""" |
|
173 | """The thread's main activity. Call start() instead.""" | |
174 | self.socket = self.context.socket(zmq.XREQ) |
|
174 | self.socket = self.context.socket(zmq.XREQ) | |
175 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
175 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) | |
176 | self.socket.connect('tcp://%s:%i' % self.address) |
|
176 | self.socket.connect('tcp://%s:%i' % self.address) | |
177 | self.iostate = POLLERR|POLLIN |
|
177 | self.iostate = POLLERR|POLLIN | |
178 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
178 | self.ioloop.add_handler(self.socket, self._handle_events, | |
179 | self.iostate) |
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179 | self.iostate) | |
180 | self.ioloop.start() |
|
180 | self.ioloop.start() | |
181 |
|
181 | |||
182 | def stop(self): |
|
182 | def stop(self): | |
183 | self.ioloop.stop() |
|
183 | self.ioloop.stop() | |
184 | super(XReqSocketChannel, self).stop() |
|
184 | super(XReqSocketChannel, self).stop() | |
185 |
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185 | |||
186 | def call_handlers(self, msg): |
|
186 | def call_handlers(self, msg): | |
187 | """This method is called in the ioloop thread when a message arrives. |
|
187 | """This method is called in the ioloop thread when a message arrives. | |
188 |
|
188 | |||
189 | Subclasses should override this method to handle incoming messages. |
|
189 | Subclasses should override this method to handle incoming messages. | |
190 | It is important to remember that this method is called in the thread |
|
190 | It is important to remember that this method is called in the thread | |
191 | so that some logic must be done to ensure that the application leve |
|
191 | so that some logic must be done to ensure that the application leve | |
192 | handlers are called in the application thread. |
|
192 | handlers are called in the application thread. | |
193 | """ |
|
193 | """ | |
194 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
194 | raise NotImplementedError('call_handlers must be defined in a subclass.') | |
195 |
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195 | |||
196 | def execute(self, code, silent=False, |
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196 | def execute(self, code, silent=False, | |
197 | user_variables=None, user_expressions=None): |
|
197 | user_variables=None, user_expressions=None): | |
198 | """Execute code in the kernel. |
|
198 | """Execute code in the kernel. | |
199 |
|
199 | |||
200 | Parameters |
|
200 | Parameters | |
201 | ---------- |
|
201 | ---------- | |
202 | code : str |
|
202 | code : str | |
203 | A string of Python code. |
|
203 | A string of Python code. | |
204 |
|
204 | |||
205 | silent : bool, optional (default False) |
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205 | silent : bool, optional (default False) | |
206 | If set, the kernel will execute the code as quietly possible. |
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206 | If set, the kernel will execute the code as quietly possible. | |
207 |
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207 | |||
208 | user_variables : list, optional |
|
208 | user_variables : list, optional | |
209 | A list of variable names to pull from the user's namespace. They |
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209 | A list of variable names to pull from the user's namespace. They | |
210 | will come back as a dict with these names as keys and their |
|
210 | will come back as a dict with these names as keys and their | |
211 | :func:`repr` as values. |
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211 | :func:`repr` as values. | |
212 |
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212 | |||
213 | user_expressions : dict, optional |
|
213 | user_expressions : dict, optional | |
214 | A dict with string keys and to pull from the user's |
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214 | A dict with string keys and to pull from the user's | |
215 | namespace. They will come back as a dict with these names as keys |
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215 | namespace. They will come back as a dict with these names as keys | |
216 | and their :func:`repr` as values. |
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216 | and their :func:`repr` as values. | |
217 |
|
217 | |||
218 | Returns |
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218 | Returns | |
219 | ------- |
|
219 | ------- | |
220 | The msg_id of the message sent. |
|
220 | The msg_id of the message sent. | |
221 | """ |
|
221 | """ | |
222 | if user_variables is None: |
|
222 | if user_variables is None: | |
223 | user_variables = [] |
|
223 | user_variables = [] | |
224 | if user_expressions is None: |
|
224 | if user_expressions is None: | |
225 | user_expressions = {} |
|
225 | user_expressions = {} | |
226 |
|
226 | |||
227 | # Don't waste network traffic if inputs are invalid |
|
227 | # Don't waste network traffic if inputs are invalid | |
228 | if not isinstance(code, basestring): |
|
228 | if not isinstance(code, basestring): | |
229 | raise ValueError('code %r must be a string' % code) |
|
229 | raise ValueError('code %r must be a string' % code) | |
230 | validate_string_list(user_variables) |
|
230 | validate_string_list(user_variables) | |
231 | validate_string_dict(user_expressions) |
|
231 | validate_string_dict(user_expressions) | |
232 |
|
232 | |||
233 | # Create class for content/msg creation. Related to, but possibly |
|
233 | # Create class for content/msg creation. Related to, but possibly | |
234 | # not in Session. |
|
234 | # not in Session. | |
235 | content = dict(code=code, silent=silent, |
|
235 | content = dict(code=code, silent=silent, | |
236 | user_variables=user_variables, |
|
236 | user_variables=user_variables, | |
237 | user_expressions=user_expressions) |
|
237 | user_expressions=user_expressions) | |
238 | msg = self.session.msg('execute_request', content) |
|
238 | msg = self.session.msg('execute_request', content) | |
239 | self._queue_request(msg) |
|
239 | self._queue_request(msg) | |
240 | return msg['header']['msg_id'] |
|
240 | return msg['header']['msg_id'] | |
241 |
|
241 | |||
242 | def complete(self, text, line, cursor_pos, block=None): |
|
242 | def complete(self, text, line, cursor_pos, block=None): | |
243 | """Tab complete text in the kernel's namespace. |
|
243 | """Tab complete text in the kernel's namespace. | |
244 |
|
244 | |||
245 | Parameters |
|
245 | Parameters | |
246 | ---------- |
|
246 | ---------- | |
247 | text : str |
|
247 | text : str | |
248 | The text to complete. |
|
248 | The text to complete. | |
249 | line : str |
|
249 | line : str | |
250 | The full line of text that is the surrounding context for the |
|
250 | The full line of text that is the surrounding context for the | |
251 | text to complete. |
|
251 | text to complete. | |
252 | cursor_pos : int |
|
252 | cursor_pos : int | |
253 | The position of the cursor in the line where the completion was |
|
253 | The position of the cursor in the line where the completion was | |
254 | requested. |
|
254 | requested. | |
255 | block : str, optional |
|
255 | block : str, optional | |
256 | The full block of code in which the completion is being requested. |
|
256 | The full block of code in which the completion is being requested. | |
257 |
|
257 | |||
258 | Returns |
|
258 | Returns | |
259 | ------- |
|
259 | ------- | |
260 | The msg_id of the message sent. |
|
260 | The msg_id of the message sent. | |
261 | """ |
|
261 | """ | |
262 | content = dict(text=text, line=line, block=block, cursor_pos=cursor_pos) |
|
262 | content = dict(text=text, line=line, block=block, cursor_pos=cursor_pos) | |
263 | msg = self.session.msg('complete_request', content) |
|
263 | msg = self.session.msg('complete_request', content) | |
264 | self._queue_request(msg) |
|
264 | self._queue_request(msg) | |
265 | return msg['header']['msg_id'] |
|
265 | return msg['header']['msg_id'] | |
266 |
|
266 | |||
267 | def object_info(self, oname): |
|
267 | def object_info(self, oname): | |
268 | """Get metadata information about an object. |
|
268 | """Get metadata information about an object. | |
269 |
|
269 | |||
270 | Parameters |
|
270 | Parameters | |
271 | ---------- |
|
271 | ---------- | |
272 | oname : str |
|
272 | oname : str | |
273 | A string specifying the object name. |
|
273 | A string specifying the object name. | |
274 |
|
274 | |||
275 | Returns |
|
275 | Returns | |
276 | ------- |
|
276 | ------- | |
277 | The msg_id of the message sent. |
|
277 | The msg_id of the message sent. | |
278 | """ |
|
278 | """ | |
279 | content = dict(oname=oname) |
|
279 | content = dict(oname=oname) | |
280 | msg = self.session.msg('object_info_request', content) |
|
280 | msg = self.session.msg('object_info_request', content) | |
281 | self._queue_request(msg) |
|
281 | self._queue_request(msg) | |
282 | return msg['header']['msg_id'] |
|
282 | return msg['header']['msg_id'] | |
283 |
|
283 | |||
284 | def history(self, index=None, raw=False, output=True): |
|
284 | def history(self, index=None, raw=False, output=True): | |
285 | """Get the history list. |
|
285 | """Get the history list. | |
286 |
|
286 | |||
287 | Parameters |
|
287 | Parameters | |
288 | ---------- |
|
288 | ---------- | |
289 | index : n or (n1, n2) or None |
|
289 | index : n or (n1, n2) or None | |
290 | If n, then the last entries. If a tuple, then all in |
|
290 | If n, then the last entries. If a tuple, then all in | |
291 | range(n1, n2). If None, then all entries. Raises IndexError if |
|
291 | range(n1, n2). If None, then all entries. Raises IndexError if | |
292 | the format of index is incorrect. |
|
292 | the format of index is incorrect. | |
293 | raw : bool |
|
293 | raw : bool | |
294 | If True, return the raw input. |
|
294 | If True, return the raw input. | |
295 | output : bool |
|
295 | output : bool | |
296 | If True, then return the output as well. |
|
296 | If True, then return the output as well. | |
297 |
|
297 | |||
298 | Returns |
|
298 | Returns | |
299 | ------- |
|
299 | ------- | |
300 | The msg_id of the message sent. |
|
300 | The msg_id of the message sent. | |
301 | """ |
|
301 | """ | |
302 | content = dict(index=index, raw=raw, output=output) |
|
302 | content = dict(index=index, raw=raw, output=output) | |
303 | msg = self.session.msg('history_request', content) |
|
303 | msg = self.session.msg('history_request', content) | |
304 | self._queue_request(msg) |
|
304 | self._queue_request(msg) | |
305 | return msg['header']['msg_id'] |
|
305 | return msg['header']['msg_id'] | |
306 |
|
306 | |||
307 | def shutdown(self): |
|
307 | def shutdown(self): | |
308 | """Request an immediate kernel shutdown. |
|
308 | """Request an immediate kernel shutdown. | |
309 |
|
309 | |||
310 | Upon receipt of the (empty) reply, client code can safely assume that |
|
310 | Upon receipt of the (empty) reply, client code can safely assume that | |
311 | the kernel has shut down and it's safe to forcefully terminate it if |
|
311 | the kernel has shut down and it's safe to forcefully terminate it if | |
312 | it's still alive. |
|
312 | it's still alive. | |
313 |
|
313 | |||
314 | The kernel will send the reply via a function registered with Python's |
|
314 | The kernel will send the reply via a function registered with Python's | |
315 | atexit module, ensuring it's truly done as the kernel is done with all |
|
315 | atexit module, ensuring it's truly done as the kernel is done with all | |
316 | normal operation. |
|
316 | normal operation. | |
317 | """ |
|
317 | """ | |
318 | # Send quit message to kernel. Once we implement kernel-side setattr, |
|
318 | # Send quit message to kernel. Once we implement kernel-side setattr, | |
319 | # this should probably be done that way, but for now this will do. |
|
319 | # this should probably be done that way, but for now this will do. | |
320 | msg = self.session.msg('shutdown_request', {}) |
|
320 | msg = self.session.msg('shutdown_request', {}) | |
321 | self._queue_request(msg) |
|
321 | self._queue_request(msg) | |
322 | return msg['header']['msg_id'] |
|
322 | return msg['header']['msg_id'] | |
323 |
|
323 | |||
324 | def _handle_events(self, socket, events): |
|
324 | def _handle_events(self, socket, events): | |
325 | if events & POLLERR: |
|
325 | if events & POLLERR: | |
326 | self._handle_err() |
|
326 | self._handle_err() | |
327 | if events & POLLOUT: |
|
327 | if events & POLLOUT: | |
328 | self._handle_send() |
|
328 | self._handle_send() | |
329 | if events & POLLIN: |
|
329 | if events & POLLIN: | |
330 | self._handle_recv() |
|
330 | self._handle_recv() | |
331 |
|
331 | |||
332 | def _handle_recv(self): |
|
332 | def _handle_recv(self): | |
333 | msg = self.socket.recv_json() |
|
333 | msg = self.socket.recv_json() | |
334 | self.call_handlers(msg) |
|
334 | self.call_handlers(msg) | |
335 |
|
335 | |||
336 | def _handle_send(self): |
|
336 | def _handle_send(self): | |
337 | try: |
|
337 | try: | |
338 | msg = self.command_queue.get(False) |
|
338 | msg = self.command_queue.get(False) | |
339 | except Empty: |
|
339 | except Empty: | |
340 | pass |
|
340 | pass | |
341 | else: |
|
341 | else: | |
342 | self.socket.send_json(msg) |
|
342 | self.socket.send_json(msg) | |
343 | if self.command_queue.empty(): |
|
343 | if self.command_queue.empty(): | |
344 | self.drop_io_state(POLLOUT) |
|
344 | self.drop_io_state(POLLOUT) | |
345 |
|
345 | |||
346 | def _handle_err(self): |
|
346 | def _handle_err(self): | |
347 | # We don't want to let this go silently, so eventually we should log. |
|
347 | # We don't want to let this go silently, so eventually we should log. | |
348 | raise zmq.ZMQError() |
|
348 | raise zmq.ZMQError() | |
349 |
|
349 | |||
350 | def _queue_request(self, msg): |
|
350 | def _queue_request(self, msg): | |
351 | self.command_queue.put(msg) |
|
351 | self.command_queue.put(msg) | |
352 | self.add_io_state(POLLOUT) |
|
352 | self.add_io_state(POLLOUT) | |
353 |
|
353 | |||
354 |
|
354 | |||
355 | class SubSocketChannel(ZmqSocketChannel): |
|
355 | class SubSocketChannel(ZmqSocketChannel): | |
356 | """The SUB channel which listens for messages that the kernel publishes. |
|
356 | """The SUB channel which listens for messages that the kernel publishes. | |
357 | """ |
|
357 | """ | |
358 |
|
358 | |||
359 | def __init__(self, context, session, address): |
|
359 | def __init__(self, context, session, address): | |
360 | super(SubSocketChannel, self).__init__(context, session, address) |
|
360 | super(SubSocketChannel, self).__init__(context, session, address) | |
361 | self.ioloop = ioloop.IOLoop() |
|
361 | self.ioloop = ioloop.IOLoop() | |
362 |
|
362 | |||
363 | def run(self): |
|
363 | def run(self): | |
364 | """The thread's main activity. Call start() instead.""" |
|
364 | """The thread's main activity. Call start() instead.""" | |
365 | self.socket = self.context.socket(zmq.SUB) |
|
365 | self.socket = self.context.socket(zmq.SUB) | |
366 | self.socket.setsockopt(zmq.SUBSCRIBE,'') |
|
366 | self.socket.setsockopt(zmq.SUBSCRIBE,'') | |
367 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
367 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) | |
368 | self.socket.connect('tcp://%s:%i' % self.address) |
|
368 | self.socket.connect('tcp://%s:%i' % self.address) | |
369 | self.iostate = POLLIN|POLLERR |
|
369 | self.iostate = POLLIN|POLLERR | |
370 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
370 | self.ioloop.add_handler(self.socket, self._handle_events, | |
371 | self.iostate) |
|
371 | self.iostate) | |
372 | self.ioloop.start() |
|
372 | self.ioloop.start() | |
373 |
|
373 | |||
374 | def stop(self): |
|
374 | def stop(self): | |
375 | self.ioloop.stop() |
|
375 | self.ioloop.stop() | |
376 | super(SubSocketChannel, self).stop() |
|
376 | super(SubSocketChannel, self).stop() | |
377 |
|
377 | |||
378 | def call_handlers(self, msg): |
|
378 | def call_handlers(self, msg): | |
379 | """This method is called in the ioloop thread when a message arrives. |
|
379 | """This method is called in the ioloop thread when a message arrives. | |
380 |
|
380 | |||
381 | Subclasses should override this method to handle incoming messages. |
|
381 | Subclasses should override this method to handle incoming messages. | |
382 | It is important to remember that this method is called in the thread |
|
382 | It is important to remember that this method is called in the thread | |
383 | so that some logic must be done to ensure that the application leve |
|
383 | so that some logic must be done to ensure that the application leve | |
384 | handlers are called in the application thread. |
|
384 | handlers are called in the application thread. | |
385 | """ |
|
385 | """ | |
386 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
386 | raise NotImplementedError('call_handlers must be defined in a subclass.') | |
387 |
|
387 | |||
388 | def flush(self, timeout=1.0): |
|
388 | def flush(self, timeout=1.0): | |
389 | """Immediately processes all pending messages on the SUB channel. |
|
389 | """Immediately processes all pending messages on the SUB channel. | |
390 |
|
390 | |||
391 | Callers should use this method to ensure that :method:`call_handlers` |
|
391 | Callers should use this method to ensure that :method:`call_handlers` | |
392 | has been called for all messages that have been received on the |
|
392 | has been called for all messages that have been received on the | |
393 | 0MQ SUB socket of this channel. |
|
393 | 0MQ SUB socket of this channel. | |
394 |
|
394 | |||
395 | This method is thread safe. |
|
395 | This method is thread safe. | |
396 |
|
396 | |||
397 | Parameters |
|
397 | Parameters | |
398 | ---------- |
|
398 | ---------- | |
399 | timeout : float, optional |
|
399 | timeout : float, optional | |
400 | The maximum amount of time to spend flushing, in seconds. The |
|
400 | The maximum amount of time to spend flushing, in seconds. The | |
401 | default is one second. |
|
401 | default is one second. | |
402 | """ |
|
402 | """ | |
403 | # We do the IOLoop callback process twice to ensure that the IOLoop |
|
403 | # We do the IOLoop callback process twice to ensure that the IOLoop | |
404 | # gets to perform at least one full poll. |
|
404 | # gets to perform at least one full poll. | |
405 | stop_time = time.time() + timeout |
|
405 | stop_time = time.time() + timeout | |
406 | for i in xrange(2): |
|
406 | for i in xrange(2): | |
407 | self._flushed = False |
|
407 | self._flushed = False | |
408 | self.ioloop.add_callback(self._flush) |
|
408 | self.ioloop.add_callback(self._flush) | |
409 | while not self._flushed and time.time() < stop_time: |
|
409 | while not self._flushed and time.time() < stop_time: | |
410 | time.sleep(0.01) |
|
410 | time.sleep(0.01) | |
411 |
|
411 | |||
412 | def _handle_events(self, socket, events): |
|
412 | def _handle_events(self, socket, events): | |
413 | # Turn on and off POLLOUT depending on if we have made a request |
|
413 | # Turn on and off POLLOUT depending on if we have made a request | |
414 | if events & POLLERR: |
|
414 | if events & POLLERR: | |
415 | self._handle_err() |
|
415 | self._handle_err() | |
416 | if events & POLLIN: |
|
416 | if events & POLLIN: | |
417 | self._handle_recv() |
|
417 | self._handle_recv() | |
418 |
|
418 | |||
419 | def _handle_err(self): |
|
419 | def _handle_err(self): | |
420 | # We don't want to let this go silently, so eventually we should log. |
|
420 | # We don't want to let this go silently, so eventually we should log. | |
421 | raise zmq.ZMQError() |
|
421 | raise zmq.ZMQError() | |
422 |
|
422 | |||
423 | def _handle_recv(self): |
|
423 | def _handle_recv(self): | |
424 | # Get all of the messages we can |
|
424 | # Get all of the messages we can | |
425 | while True: |
|
425 | while True: | |
426 | try: |
|
426 | try: | |
427 | msg = self.socket.recv_json(zmq.NOBLOCK) |
|
427 | msg = self.socket.recv_json(zmq.NOBLOCK) | |
428 | except zmq.ZMQError: |
|
428 | except zmq.ZMQError: | |
429 | # Check the errno? |
|
429 | # Check the errno? | |
430 | # Will this trigger POLLERR? |
|
430 | # Will this trigger POLLERR? | |
431 | break |
|
431 | break | |
432 | else: |
|
432 | else: | |
433 | self.call_handlers(msg) |
|
433 | self.call_handlers(msg) | |
434 |
|
434 | |||
435 | def _flush(self): |
|
435 | def _flush(self): | |
436 | """Callback for :method:`self.flush`.""" |
|
436 | """Callback for :method:`self.flush`.""" | |
437 | self._flushed = True |
|
437 | self._flushed = True | |
438 |
|
438 | |||
439 |
|
439 | |||
440 | class RepSocketChannel(ZmqSocketChannel): |
|
440 | class RepSocketChannel(ZmqSocketChannel): | |
441 | """A reply channel to handle raw_input requests that the kernel makes.""" |
|
441 | """A reply channel to handle raw_input requests that the kernel makes.""" | |
442 |
|
442 | |||
443 | msg_queue = None |
|
443 | msg_queue = None | |
444 |
|
444 | |||
445 | def __init__(self, context, session, address): |
|
445 | def __init__(self, context, session, address): | |
446 | super(RepSocketChannel, self).__init__(context, session, address) |
|
446 | super(RepSocketChannel, self).__init__(context, session, address) | |
447 | self.ioloop = ioloop.IOLoop() |
|
447 | self.ioloop = ioloop.IOLoop() | |
448 | self.msg_queue = Queue() |
|
448 | self.msg_queue = Queue() | |
449 |
|
449 | |||
450 | def run(self): |
|
450 | def run(self): | |
451 | """The thread's main activity. Call start() instead.""" |
|
451 | """The thread's main activity. Call start() instead.""" | |
452 | self.socket = self.context.socket(zmq.XREQ) |
|
452 | self.socket = self.context.socket(zmq.XREQ) | |
453 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
453 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) | |
454 | self.socket.connect('tcp://%s:%i' % self.address) |
|
454 | self.socket.connect('tcp://%s:%i' % self.address) | |
455 | self.iostate = POLLERR|POLLIN |
|
455 | self.iostate = POLLERR|POLLIN | |
456 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
456 | self.ioloop.add_handler(self.socket, self._handle_events, | |
457 | self.iostate) |
|
457 | self.iostate) | |
458 | self.ioloop.start() |
|
458 | self.ioloop.start() | |
459 |
|
459 | |||
460 | def stop(self): |
|
460 | def stop(self): | |
461 | self.ioloop.stop() |
|
461 | self.ioloop.stop() | |
462 | super(RepSocketChannel, self).stop() |
|
462 | super(RepSocketChannel, self).stop() | |
463 |
|
463 | |||
464 | def call_handlers(self, msg): |
|
464 | def call_handlers(self, msg): | |
465 | """This method is called in the ioloop thread when a message arrives. |
|
465 | """This method is called in the ioloop thread when a message arrives. | |
466 |
|
466 | |||
467 | Subclasses should override this method to handle incoming messages. |
|
467 | Subclasses should override this method to handle incoming messages. | |
468 | It is important to remember that this method is called in the thread |
|
468 | It is important to remember that this method is called in the thread | |
469 | so that some logic must be done to ensure that the application leve |
|
469 | so that some logic must be done to ensure that the application leve | |
470 | handlers are called in the application thread. |
|
470 | handlers are called in the application thread. | |
471 | """ |
|
471 | """ | |
472 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
472 | raise NotImplementedError('call_handlers must be defined in a subclass.') | |
473 |
|
473 | |||
474 | def input(self, string): |
|
474 | def input(self, string): | |
475 | """Send a string of raw input to the kernel.""" |
|
475 | """Send a string of raw input to the kernel.""" | |
476 | content = dict(value=string) |
|
476 | content = dict(value=string) | |
477 | msg = self.session.msg('input_reply', content) |
|
477 | msg = self.session.msg('input_reply', content) | |
478 | self._queue_reply(msg) |
|
478 | self._queue_reply(msg) | |
479 |
|
479 | |||
480 | def _handle_events(self, socket, events): |
|
480 | def _handle_events(self, socket, events): | |
481 | if events & POLLERR: |
|
481 | if events & POLLERR: | |
482 | self._handle_err() |
|
482 | self._handle_err() | |
483 | if events & POLLOUT: |
|
483 | if events & POLLOUT: | |
484 | self._handle_send() |
|
484 | self._handle_send() | |
485 | if events & POLLIN: |
|
485 | if events & POLLIN: | |
486 | self._handle_recv() |
|
486 | self._handle_recv() | |
487 |
|
487 | |||
488 | def _handle_recv(self): |
|
488 | def _handle_recv(self): | |
489 | msg = self.socket.recv_json() |
|
489 | msg = self.socket.recv_json() | |
490 | self.call_handlers(msg) |
|
490 | self.call_handlers(msg) | |
491 |
|
491 | |||
492 | def _handle_send(self): |
|
492 | def _handle_send(self): | |
493 | try: |
|
493 | try: | |
494 | msg = self.msg_queue.get(False) |
|
494 | msg = self.msg_queue.get(False) | |
495 | except Empty: |
|
495 | except Empty: | |
496 | pass |
|
496 | pass | |
497 | else: |
|
497 | else: | |
498 | self.socket.send_json(msg) |
|
498 | self.socket.send_json(msg) | |
499 | if self.msg_queue.empty(): |
|
499 | if self.msg_queue.empty(): | |
500 | self.drop_io_state(POLLOUT) |
|
500 | self.drop_io_state(POLLOUT) | |
501 |
|
501 | |||
502 | def _handle_err(self): |
|
502 | def _handle_err(self): | |
503 | # We don't want to let this go silently, so eventually we should log. |
|
503 | # We don't want to let this go silently, so eventually we should log. | |
504 | raise zmq.ZMQError() |
|
504 | raise zmq.ZMQError() | |
505 |
|
505 | |||
506 | def _queue_reply(self, msg): |
|
506 | def _queue_reply(self, msg): | |
507 | self.msg_queue.put(msg) |
|
507 | self.msg_queue.put(msg) | |
508 | self.add_io_state(POLLOUT) |
|
508 | self.add_io_state(POLLOUT) | |
509 |
|
509 | |||
510 |
|
510 | |||
511 | class HBSocketChannel(ZmqSocketChannel): |
|
511 | class HBSocketChannel(ZmqSocketChannel): | |
512 | """The heartbeat channel which monitors the kernel heartbeat. |
|
512 | """The heartbeat channel which monitors the kernel heartbeat. | |
513 |
|
513 | |||
514 | Note that the heartbeat channel is paused by default. As long as you start |
|
514 | Note that the heartbeat channel is paused by default. As long as you start | |
515 | this channel, the kernel manager will ensure that it is paused and un-paused |
|
515 | this channel, the kernel manager will ensure that it is paused and un-paused | |
516 | as appropriate. |
|
516 | as appropriate. | |
517 | """ |
|
517 | """ | |
518 |
|
518 | |||
519 | time_to_dead = 3.0 |
|
519 | time_to_dead = 3.0 | |
520 | socket = None |
|
520 | socket = None | |
521 | poller = None |
|
521 | poller = None | |
522 | _running = None |
|
522 | _running = None | |
523 | _pause = None |
|
523 | _pause = None | |
524 |
|
524 | |||
525 | def __init__(self, context, session, address): |
|
525 | def __init__(self, context, session, address): | |
526 | super(HBSocketChannel, self).__init__(context, session, address) |
|
526 | super(HBSocketChannel, self).__init__(context, session, address) | |
527 | self._running = False |
|
527 | self._running = False | |
528 | self._pause = True |
|
528 | self._pause = True | |
529 |
|
529 | |||
530 | def _create_socket(self): |
|
530 | def _create_socket(self): | |
531 | self.socket = self.context.socket(zmq.REQ) |
|
531 | self.socket = self.context.socket(zmq.REQ) | |
532 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
532 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) | |
533 | self.socket.connect('tcp://%s:%i' % self.address) |
|
533 | self.socket.connect('tcp://%s:%i' % self.address) | |
534 | self.poller = zmq.Poller() |
|
534 | self.poller = zmq.Poller() | |
535 | self.poller.register(self.socket, zmq.POLLIN) |
|
535 | self.poller.register(self.socket, zmq.POLLIN) | |
536 |
|
536 | |||
537 | def run(self): |
|
537 | def run(self): | |
538 | """The thread's main activity. Call start() instead.""" |
|
538 | """The thread's main activity. Call start() instead.""" | |
539 | self._create_socket() |
|
539 | self._create_socket() | |
540 | self._running = True |
|
540 | self._running = True | |
541 | while self._running: |
|
541 | while self._running: | |
542 | if self._pause: |
|
542 | if self._pause: | |
543 | time.sleep(self.time_to_dead) |
|
543 | time.sleep(self.time_to_dead) | |
544 | else: |
|
544 | else: | |
545 | since_last_heartbeat = 0.0 |
|
545 | since_last_heartbeat = 0.0 | |
546 | request_time = time.time() |
|
546 | request_time = time.time() | |
547 | try: |
|
547 | try: | |
548 | #io.rprint('Ping from HB channel') # dbg |
|
548 | #io.rprint('Ping from HB channel') # dbg | |
549 | self.socket.send_json('ping') |
|
549 | self.socket.send_json('ping') | |
550 | except zmq.ZMQError, e: |
|
550 | except zmq.ZMQError, e: | |
551 | #io.rprint('*** HB Error:', e) # dbg |
|
551 | #io.rprint('*** HB Error:', e) # dbg | |
552 | if e.errno == zmq.EFSM: |
|
552 | if e.errno == zmq.EFSM: | |
553 | #io.rprint('sleep...', self.time_to_dead) # dbg |
|
553 | #io.rprint('sleep...', self.time_to_dead) # dbg | |
554 | time.sleep(self.time_to_dead) |
|
554 | time.sleep(self.time_to_dead) | |
555 | self._create_socket() |
|
555 | self._create_socket() | |
556 | else: |
|
556 | else: | |
557 | raise |
|
557 | raise | |
558 | else: |
|
558 | else: | |
559 | while True: |
|
559 | while True: | |
560 | try: |
|
560 | try: | |
561 | self.socket.recv_json(zmq.NOBLOCK) |
|
561 | self.socket.recv_json(zmq.NOBLOCK) | |
562 | except zmq.ZMQError, e: |
|
562 | except zmq.ZMQError, e: | |
563 | #io.rprint('*** HB Error 2:', e) # dbg |
|
563 | #io.rprint('*** HB Error 2:', e) # dbg | |
564 | if e.errno == zmq.EAGAIN: |
|
564 | if e.errno == zmq.EAGAIN: | |
565 | before_poll = time.time() |
|
565 | before_poll = time.time() | |
566 | until_dead = self.time_to_dead - (before_poll - |
|
566 | until_dead = self.time_to_dead - (before_poll - | |
567 | request_time) |
|
567 | request_time) | |
568 |
|
568 | |||
569 | # When the return value of poll() is an empty |
|
569 | # When the return value of poll() is an empty | |
570 | # list, that is when things have gone wrong |
|
570 | # list, that is when things have gone wrong | |
571 | # (zeromq bug). As long as it is not an empty |
|
571 | # (zeromq bug). As long as it is not an empty | |
572 | # list, poll is working correctly even if it |
|
572 | # list, poll is working correctly even if it | |
573 | # returns quickly. Note: poll timeout is in |
|
573 | # returns quickly. Note: poll timeout is in | |
574 | # milliseconds. |
|
574 | # milliseconds. | |
575 | self.poller.poll(1000*until_dead) |
|
575 | self.poller.poll(1000*until_dead) | |
576 |
|
576 | |||
577 | since_last_heartbeat = time.time()-request_time |
|
577 | since_last_heartbeat = time.time()-request_time | |
578 | if since_last_heartbeat > self.time_to_dead: |
|
578 | if since_last_heartbeat > self.time_to_dead: | |
579 | self.call_handlers(since_last_heartbeat) |
|
579 | self.call_handlers(since_last_heartbeat) | |
580 | break |
|
580 | break | |
581 | else: |
|
581 | else: | |
582 | # FIXME: We should probably log this instead. |
|
582 | # FIXME: We should probably log this instead. | |
583 | raise |
|
583 | raise | |
584 | else: |
|
584 | else: | |
585 | until_dead = self.time_to_dead - (time.time() - |
|
585 | until_dead = self.time_to_dead - (time.time() - | |
586 | request_time) |
|
586 | request_time) | |
587 | if until_dead > 0.0: |
|
587 | if until_dead > 0.0: | |
588 | #io.rprint('sleep...', self.time_to_dead) # dbg |
|
588 | #io.rprint('sleep...', self.time_to_dead) # dbg | |
589 | time.sleep(until_dead) |
|
589 | time.sleep(until_dead) | |
590 | break |
|
590 | break | |
591 |
|
591 | |||
592 | def pause(self): |
|
592 | def pause(self): | |
593 | """Pause the heartbeat.""" |
|
593 | """Pause the heartbeat.""" | |
594 | self._pause = True |
|
594 | self._pause = True | |
595 |
|
595 | |||
596 | def unpause(self): |
|
596 | def unpause(self): | |
597 | """Unpause the heartbeat.""" |
|
597 | """Unpause the heartbeat.""" | |
598 | self._pause = False |
|
598 | self._pause = False | |
599 |
|
599 | |||
600 | def is_beating(self): |
|
600 | def is_beating(self): | |
601 | """Is the heartbeat running and not paused.""" |
|
601 | """Is the heartbeat running and not paused.""" | |
602 | if self.is_alive() and not self._pause: |
|
602 | if self.is_alive() and not self._pause: | |
603 | return True |
|
603 | return True | |
604 | else: |
|
604 | else: | |
605 | return False |
|
605 | return False | |
606 |
|
606 | |||
607 | def stop(self): |
|
607 | def stop(self): | |
608 | self._running = False |
|
608 | self._running = False | |
609 | super(HBSocketChannel, self).stop() |
|
609 | super(HBSocketChannel, self).stop() | |
610 |
|
610 | |||
611 | def call_handlers(self, since_last_heartbeat): |
|
611 | def call_handlers(self, since_last_heartbeat): | |
612 | """This method is called in the ioloop thread when a message arrives. |
|
612 | """This method is called in the ioloop thread when a message arrives. | |
613 |
|
613 | |||
614 | Subclasses should override this method to handle incoming messages. |
|
614 | Subclasses should override this method to handle incoming messages. | |
615 | It is important to remember that this method is called in the thread |
|
615 | It is important to remember that this method is called in the thread | |
616 | so that some logic must be done to ensure that the application leve |
|
616 | so that some logic must be done to ensure that the application leve | |
617 | handlers are called in the application thread. |
|
617 | handlers are called in the application thread. | |
618 | """ |
|
618 | """ | |
619 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
619 | raise NotImplementedError('call_handlers must be defined in a subclass.') | |
620 |
|
620 | |||
621 |
|
621 | |||
622 | #----------------------------------------------------------------------------- |
|
622 | #----------------------------------------------------------------------------- | |
623 | # Main kernel manager class |
|
623 | # Main kernel manager class | |
624 | #----------------------------------------------------------------------------- |
|
624 | #----------------------------------------------------------------------------- | |
625 |
|
625 | |||
626 | class KernelManager(HasTraits): |
|
626 | class KernelManager(HasTraits): | |
627 | """ Manages a kernel for a frontend. |
|
627 | """ Manages a kernel for a frontend. | |
628 |
|
628 | |||
629 | The SUB channel is for the frontend to receive messages published by the |
|
629 | The SUB channel is for the frontend to receive messages published by the | |
630 | kernel. |
|
630 | kernel. | |
631 |
|
631 | |||
632 | The REQ channel is for the frontend to make requests of the kernel. |
|
632 | The REQ channel is for the frontend to make requests of the kernel. | |
633 |
|
633 | |||
634 | The REP channel is for the kernel to request stdin (raw_input) from the |
|
634 | The REP channel is for the kernel to request stdin (raw_input) from the | |
635 | frontend. |
|
635 | frontend. | |
636 | """ |
|
636 | """ | |
637 | # The PyZMQ Context to use for communication with the kernel. |
|
637 | # The PyZMQ Context to use for communication with the kernel. | |
638 | context = Instance(zmq.Context,(),{}) |
|
638 | context = Instance(zmq.Context,(),{}) | |
639 |
|
639 | |||
640 | # The Session to use for communication with the kernel. |
|
640 | # The Session to use for communication with the kernel. | |
641 | session = Instance(Session,(),{}) |
|
641 | session = Instance(Session,(),{}) | |
642 |
|
642 | |||
643 | # The kernel process with which the KernelManager is communicating. |
|
643 | # The kernel process with which the KernelManager is communicating. | |
644 | kernel = Instance(Popen) |
|
644 | kernel = Instance(Popen) | |
645 |
|
645 | |||
646 | # The addresses for the communication channels. |
|
646 | # The addresses for the communication channels. | |
647 | xreq_address = TCPAddress((LOCALHOST, 0)) |
|
647 | xreq_address = TCPAddress((LOCALHOST, 0)) | |
648 | sub_address = TCPAddress((LOCALHOST, 0)) |
|
648 | sub_address = TCPAddress((LOCALHOST, 0)) | |
649 | rep_address = TCPAddress((LOCALHOST, 0)) |
|
649 | rep_address = TCPAddress((LOCALHOST, 0)) | |
650 | hb_address = TCPAddress((LOCALHOST, 0)) |
|
650 | hb_address = TCPAddress((LOCALHOST, 0)) | |
651 |
|
651 | |||
652 | # The classes to use for the various channels. |
|
652 | # The classes to use for the various channels. | |
653 | xreq_channel_class = Type(XReqSocketChannel) |
|
653 | xreq_channel_class = Type(XReqSocketChannel) | |
654 | sub_channel_class = Type(SubSocketChannel) |
|
654 | sub_channel_class = Type(SubSocketChannel) | |
655 | rep_channel_class = Type(RepSocketChannel) |
|
655 | rep_channel_class = Type(RepSocketChannel) | |
656 | hb_channel_class = Type(HBSocketChannel) |
|
656 | hb_channel_class = Type(HBSocketChannel) | |
657 |
|
657 | |||
658 | # Protected traits. |
|
658 | # Protected traits. | |
659 | _launch_args = Any |
|
659 | _launch_args = Any | |
660 | _xreq_channel = Any |
|
660 | _xreq_channel = Any | |
661 | _sub_channel = Any |
|
661 | _sub_channel = Any | |
662 | _rep_channel = Any |
|
662 | _rep_channel = Any | |
663 | _hb_channel = Any |
|
663 | _hb_channel = Any | |
664 |
|
664 | |||
665 | #-------------------------------------------------------------------------- |
|
665 | #-------------------------------------------------------------------------- | |
666 | # Channel management methods: |
|
666 | # Channel management methods: | |
667 | #-------------------------------------------------------------------------- |
|
667 | #-------------------------------------------------------------------------- | |
668 |
|
668 | |||
669 | def start_channels(self, xreq=True, sub=True, rep=True, hb=True): |
|
669 | def start_channels(self, xreq=True, sub=True, rep=True, hb=True): | |
670 | """Starts the channels for this kernel. |
|
670 | """Starts the channels for this kernel. | |
671 |
|
671 | |||
672 | This will create the channels if they do not exist and then start |
|
672 | This will create the channels if they do not exist and then start | |
673 | them. If port numbers of 0 are being used (random ports) then you |
|
673 | them. If port numbers of 0 are being used (random ports) then you | |
674 | must first call :method:`start_kernel`. If the channels have been |
|
674 | must first call :method:`start_kernel`. If the channels have been | |
675 | stopped and you call this, :class:`RuntimeError` will be raised. |
|
675 | stopped and you call this, :class:`RuntimeError` will be raised. | |
676 | """ |
|
676 | """ | |
677 | if xreq: |
|
677 | if xreq: | |
678 | self.xreq_channel.start() |
|
678 | self.xreq_channel.start() | |
679 | if sub: |
|
679 | if sub: | |
680 | self.sub_channel.start() |
|
680 | self.sub_channel.start() | |
681 | if rep: |
|
681 | if rep: | |
682 | self.rep_channel.start() |
|
682 | self.rep_channel.start() | |
683 | if hb: |
|
683 | if hb: | |
684 | self.hb_channel.start() |
|
684 | self.hb_channel.start() | |
685 |
|
685 | |||
686 | def stop_channels(self): |
|
686 | def stop_channels(self): | |
687 | """Stops all the running channels for this kernel. |
|
687 | """Stops all the running channels for this kernel. | |
688 | """ |
|
688 | """ | |
689 | if self.xreq_channel.is_alive(): |
|
689 | if self.xreq_channel.is_alive(): | |
690 | self.xreq_channel.stop() |
|
690 | self.xreq_channel.stop() | |
691 | if self.sub_channel.is_alive(): |
|
691 | if self.sub_channel.is_alive(): | |
692 | self.sub_channel.stop() |
|
692 | self.sub_channel.stop() | |
693 | if self.rep_channel.is_alive(): |
|
693 | if self.rep_channel.is_alive(): | |
694 | self.rep_channel.stop() |
|
694 | self.rep_channel.stop() | |
695 | if self.hb_channel.is_alive(): |
|
695 | if self.hb_channel.is_alive(): | |
696 | self.hb_channel.stop() |
|
696 | self.hb_channel.stop() | |
697 |
|
697 | |||
698 | @property |
|
698 | @property | |
699 | def channels_running(self): |
|
699 | def channels_running(self): | |
700 | """Are any of the channels created and running?""" |
|
700 | """Are any of the channels created and running?""" | |
701 | return (self.xreq_channel.is_alive() or self.sub_channel.is_alive() or |
|
701 | return (self.xreq_channel.is_alive() or self.sub_channel.is_alive() or | |
702 | self.rep_channel.is_alive() or self.hb_channel.is_alive()) |
|
702 | self.rep_channel.is_alive() or self.hb_channel.is_alive()) | |
703 |
|
703 | |||
704 | #-------------------------------------------------------------------------- |
|
704 | #-------------------------------------------------------------------------- | |
705 | # Kernel process management methods: |
|
705 | # Kernel process management methods: | |
706 | #-------------------------------------------------------------------------- |
|
706 | #-------------------------------------------------------------------------- | |
707 |
|
707 | |||
708 | def start_kernel(self, **kw): |
|
708 | def start_kernel(self, **kw): | |
709 | """Starts a kernel process and configures the manager to use it. |
|
709 | """Starts a kernel process and configures the manager to use it. | |
710 |
|
710 | |||
711 | If random ports (port=0) are being used, this method must be called |
|
711 | If random ports (port=0) are being used, this method must be called | |
712 | before the channels are created. |
|
712 | before the channels are created. | |
713 |
|
713 | |||
714 | Parameters: |
|
714 | Parameters: | |
715 | ----------- |
|
715 | ----------- | |
716 | ipython : bool, optional (default True) |
|
716 | ipython : bool, optional (default True) | |
717 | Whether to use an IPython kernel instead of a plain Python kernel. |
|
717 | Whether to use an IPython kernel instead of a plain Python kernel. | |
718 | """ |
|
718 | """ | |
719 | xreq, sub, rep, hb = self.xreq_address, self.sub_address, \ |
|
719 | xreq, sub, rep, hb = self.xreq_address, self.sub_address, \ | |
720 | self.rep_address, self.hb_address |
|
720 | self.rep_address, self.hb_address | |
721 | if xreq[0] != LOCALHOST or sub[0] != LOCALHOST or \ |
|
721 | if xreq[0] != LOCALHOST or sub[0] != LOCALHOST or \ | |
722 | rep[0] != LOCALHOST or hb[0] != LOCALHOST: |
|
722 | rep[0] != LOCALHOST or hb[0] != LOCALHOST: | |
723 | raise RuntimeError("Can only launch a kernel on localhost." |
|
723 | raise RuntimeError("Can only launch a kernel on localhost." | |
724 | "Make sure that the '*_address' attributes are " |
|
724 | "Make sure that the '*_address' attributes are " | |
725 | "configured properly.") |
|
725 | "configured properly.") | |
726 |
|
726 | |||
727 | self._launch_args = kw.copy() |
|
727 | self._launch_args = kw.copy() | |
728 | if kw.pop('ipython', True): |
|
728 | if kw.pop('ipython', True): | |
729 | from ipkernel import launch_kernel |
|
729 | from ipkernel import launch_kernel | |
730 | else: |
|
730 | else: | |
731 | from pykernel import launch_kernel |
|
731 | from pykernel import launch_kernel | |
732 | self.kernel, xrep, pub, req, hb = launch_kernel( |
|
732 | self.kernel, xrep, pub, req, hb = launch_kernel( | |
733 | xrep_port=xreq[1], pub_port=sub[1], |
|
733 | xrep_port=xreq[1], pub_port=sub[1], | |
734 | req_port=rep[1], hb_port=hb[1], **kw) |
|
734 | req_port=rep[1], hb_port=hb[1], **kw) | |
735 | self.xreq_address = (LOCALHOST, xrep) |
|
735 | self.xreq_address = (LOCALHOST, xrep) | |
736 | self.sub_address = (LOCALHOST, pub) |
|
736 | self.sub_address = (LOCALHOST, pub) | |
737 | self.rep_address = (LOCALHOST, req) |
|
737 | self.rep_address = (LOCALHOST, req) | |
738 | self.hb_address = (LOCALHOST, hb) |
|
738 | self.hb_address = (LOCALHOST, hb) | |
739 |
|
739 | |||
740 | def shutdown_kernel(self): |
|
740 | def shutdown_kernel(self): | |
741 | """ Attempts to the stop the kernel process cleanly. If the kernel |
|
741 | """ Attempts to the stop the kernel process cleanly. If the kernel | |
742 | cannot be stopped, it is killed, if possible. |
|
742 | cannot be stopped, it is killed, if possible. | |
743 | """ |
|
743 | """ | |
744 | # FIXME: Shutdown does not work on Windows due to ZMQ errors! |
|
744 | # FIXME: Shutdown does not work on Windows due to ZMQ errors! | |
745 | if sys.platform == 'win32': |
|
745 | if sys.platform == 'win32': | |
746 | self.kill_kernel() |
|
746 | self.kill_kernel() | |
747 | return |
|
747 | return | |
748 |
|
748 | |||
749 | # Pause the heart beat channel if it exists. |
|
749 | # Pause the heart beat channel if it exists. | |
750 | if self._hb_channel is not None: |
|
750 | if self._hb_channel is not None: | |
751 | self._hb_channel.pause() |
|
751 | self._hb_channel.pause() | |
752 |
|
752 | |||
753 | # Don't send any additional kernel kill messages immediately, to give |
|
753 | # Don't send any additional kernel kill messages immediately, to give | |
754 | # the kernel a chance to properly execute shutdown actions. Wait for at |
|
754 | # the kernel a chance to properly execute shutdown actions. Wait for at | |
755 | # most 1s, checking every 0.1s. |
|
755 | # most 1s, checking every 0.1s. | |
756 | self.xreq_channel.shutdown() |
|
756 | self.xreq_channel.shutdown() | |
757 | for i in range(10): |
|
757 | for i in range(10): | |
758 | if self.is_alive: |
|
758 | if self.is_alive: | |
759 | time.sleep(0.1) |
|
759 | time.sleep(0.1) | |
760 | else: |
|
760 | else: | |
761 | break |
|
761 | break | |
762 | else: |
|
762 | else: | |
763 | # OK, we've waited long enough. |
|
763 | # OK, we've waited long enough. | |
764 | if self.has_kernel: |
|
764 | if self.has_kernel: | |
765 | self.kill_kernel() |
|
765 | self.kill_kernel() | |
766 |
|
766 | |||
767 | def restart_kernel(self, now=False): |
|
767 | def restart_kernel(self, now=False): | |
768 | """Restarts a kernel with the same arguments that were used to launch |
|
768 | """Restarts a kernel with the same arguments that were used to launch | |
769 | it. If the old kernel was launched with random ports, the same ports |
|
769 | it. If the old kernel was launched with random ports, the same ports | |
770 | will be used for the new kernel. |
|
770 | will be used for the new kernel. | |
771 |
|
771 | |||
772 | Parameters |
|
772 | Parameters | |
773 | ---------- |
|
773 | ---------- | |
774 | now : bool, optional |
|
774 | now : bool, optional | |
775 | If True, the kernel is forcefully restarted *immediately*, without |
|
775 | If True, the kernel is forcefully restarted *immediately*, without | |
776 | having a chance to do any cleanup action. Otherwise the kernel is |
|
776 | having a chance to do any cleanup action. Otherwise the kernel is | |
777 | given 1s to clean up before a forceful restart is issued. |
|
777 | given 1s to clean up before a forceful restart is issued. | |
778 |
|
778 | |||
779 | In all cases the kernel is restarted, the only difference is whether |
|
779 | In all cases the kernel is restarted, the only difference is whether | |
780 | it is given a chance to perform a clean shutdown or not. |
|
780 | it is given a chance to perform a clean shutdown or not. | |
781 | """ |
|
781 | """ | |
782 | if self._launch_args is None: |
|
782 | if self._launch_args is None: | |
783 | raise RuntimeError("Cannot restart the kernel. " |
|
783 | raise RuntimeError("Cannot restart the kernel. " | |
784 | "No previous call to 'start_kernel'.") |
|
784 | "No previous call to 'start_kernel'.") | |
785 | else: |
|
785 | else: | |
786 | if self.has_kernel: |
|
786 | if self.has_kernel: | |
787 | if now: |
|
787 | if now: | |
788 | self.kill_kernel() |
|
788 | self.kill_kernel() | |
789 | else: |
|
789 | else: | |
790 | self.shutdown_kernel() |
|
790 | self.shutdown_kernel() | |
791 | self.start_kernel(**self._launch_args) |
|
791 | self.start_kernel(**self._launch_args) | |
792 |
|
792 | |||
793 | # FIXME: Messages get dropped in Windows due to probable ZMQ bug |
|
793 | # FIXME: Messages get dropped in Windows due to probable ZMQ bug | |
794 | # unless there is some delay here. |
|
794 | # unless there is some delay here. | |
795 | if sys.platform == 'win32': |
|
795 | if sys.platform == 'win32': | |
796 | time.sleep(0.2) |
|
796 | time.sleep(0.2) | |
797 |
|
797 | |||
798 | @property |
|
798 | @property | |
799 | def has_kernel(self): |
|
799 | def has_kernel(self): | |
800 | """Returns whether a kernel process has been specified for the kernel |
|
800 | """Returns whether a kernel process has been specified for the kernel | |
801 | manager. |
|
801 | manager. | |
802 | """ |
|
802 | """ | |
803 | return self.kernel is not None |
|
803 | return self.kernel is not None | |
804 |
|
804 | |||
805 | def kill_kernel(self): |
|
805 | def kill_kernel(self): | |
806 | """ Kill the running kernel. """ |
|
806 | """ Kill the running kernel. """ | |
807 | if self.has_kernel: |
|
807 | if self.has_kernel: | |
808 | # Pause the heart beat channel if it exists. |
|
808 | # Pause the heart beat channel if it exists. | |
809 | if self._hb_channel is not None: |
|
809 | if self._hb_channel is not None: | |
810 | self._hb_channel.pause() |
|
810 | self._hb_channel.pause() | |
811 |
|
811 | |||
812 | self.kernel.kill() |
|
812 | # Attempt to kill the kernel. | |
|
813 | try: | |||
|
814 | self.kernel.kill() | |||
|
815 | except OSError, e: | |||
|
816 | # In Windows, we will get an Access Denied error if the process | |||
|
817 | # has already terminated. Ignore it. | |||
|
818 | if not (sys.platform == 'win32' and e.winerror == 5): | |||
|
819 | raise | |||
813 | self.kernel = None |
|
820 | self.kernel = None | |
814 | else: |
|
821 | else: | |
815 | raise RuntimeError("Cannot kill kernel. No kernel is running!") |
|
822 | raise RuntimeError("Cannot kill kernel. No kernel is running!") | |
816 |
|
823 | |||
817 | def interrupt_kernel(self): |
|
824 | def interrupt_kernel(self): | |
818 | """ Interrupts the kernel. Unlike ``signal_kernel``, this operation is |
|
825 | """ Interrupts the kernel. Unlike ``signal_kernel``, this operation is | |
819 | well supported on all platforms. |
|
826 | well supported on all platforms. | |
820 | """ |
|
827 | """ | |
821 | if self.has_kernel: |
|
828 | if self.has_kernel: | |
822 | if sys.platform == 'win32': |
|
829 | if sys.platform == 'win32': | |
823 | from parentpoller import ParentPollerWindows as Poller |
|
830 | from parentpoller import ParentPollerWindows as Poller | |
824 | Poller.send_interrupt(self.kernel.win32_interrupt_event) |
|
831 | Poller.send_interrupt(self.kernel.win32_interrupt_event) | |
825 | else: |
|
832 | else: | |
826 | self.kernel.send_signal(signal.SIGINT) |
|
833 | self.kernel.send_signal(signal.SIGINT) | |
827 | else: |
|
834 | else: | |
828 | raise RuntimeError("Cannot interrupt kernel. No kernel is running!") |
|
835 | raise RuntimeError("Cannot interrupt kernel. No kernel is running!") | |
829 |
|
836 | |||
830 | def signal_kernel(self, signum): |
|
837 | def signal_kernel(self, signum): | |
831 | """ Sends a signal to the kernel. Note that since only SIGTERM is |
|
838 | """ Sends a signal to the kernel. Note that since only SIGTERM is | |
832 | supported on Windows, this function is only useful on Unix systems. |
|
839 | supported on Windows, this function is only useful on Unix systems. | |
833 | """ |
|
840 | """ | |
834 | if self.has_kernel: |
|
841 | if self.has_kernel: | |
835 | self.kernel.send_signal(signum) |
|
842 | self.kernel.send_signal(signum) | |
836 | else: |
|
843 | else: | |
837 | raise RuntimeError("Cannot signal kernel. No kernel is running!") |
|
844 | raise RuntimeError("Cannot signal kernel. No kernel is running!") | |
838 |
|
845 | |||
839 | @property |
|
846 | @property | |
840 | def is_alive(self): |
|
847 | def is_alive(self): | |
841 | """Is the kernel process still running?""" |
|
848 | """Is the kernel process still running?""" | |
842 | # FIXME: not using a heartbeat means this method is broken for any |
|
849 | # FIXME: not using a heartbeat means this method is broken for any | |
843 | # remote kernel, it's only capable of handling local kernels. |
|
850 | # remote kernel, it's only capable of handling local kernels. | |
844 | if self.has_kernel: |
|
851 | if self.has_kernel: | |
845 | if self.kernel.poll() is None: |
|
852 | if self.kernel.poll() is None: | |
846 | return True |
|
853 | return True | |
847 | else: |
|
854 | else: | |
848 | return False |
|
855 | return False | |
849 | else: |
|
856 | else: | |
850 | # We didn't start the kernel with this KernelManager so we don't |
|
857 | # We didn't start the kernel with this KernelManager so we don't | |
851 | # know if it is running. We should use a heartbeat for this case. |
|
858 | # know if it is running. We should use a heartbeat for this case. | |
852 | return True |
|
859 | return True | |
853 |
|
860 | |||
854 | #-------------------------------------------------------------------------- |
|
861 | #-------------------------------------------------------------------------- | |
855 | # Channels used for communication with the kernel: |
|
862 | # Channels used for communication with the kernel: | |
856 | #-------------------------------------------------------------------------- |
|
863 | #-------------------------------------------------------------------------- | |
857 |
|
864 | |||
858 | @property |
|
865 | @property | |
859 | def xreq_channel(self): |
|
866 | def xreq_channel(self): | |
860 | """Get the REQ socket channel object to make requests of the kernel.""" |
|
867 | """Get the REQ socket channel object to make requests of the kernel.""" | |
861 | if self._xreq_channel is None: |
|
868 | if self._xreq_channel is None: | |
862 | self._xreq_channel = self.xreq_channel_class(self.context, |
|
869 | self._xreq_channel = self.xreq_channel_class(self.context, | |
863 | self.session, |
|
870 | self.session, | |
864 | self.xreq_address) |
|
871 | self.xreq_address) | |
865 | return self._xreq_channel |
|
872 | return self._xreq_channel | |
866 |
|
873 | |||
867 | @property |
|
874 | @property | |
868 | def sub_channel(self): |
|
875 | def sub_channel(self): | |
869 | """Get the SUB socket channel object.""" |
|
876 | """Get the SUB socket channel object.""" | |
870 | if self._sub_channel is None: |
|
877 | if self._sub_channel is None: | |
871 | self._sub_channel = self.sub_channel_class(self.context, |
|
878 | self._sub_channel = self.sub_channel_class(self.context, | |
872 | self.session, |
|
879 | self.session, | |
873 | self.sub_address) |
|
880 | self.sub_address) | |
874 | return self._sub_channel |
|
881 | return self._sub_channel | |
875 |
|
882 | |||
876 | @property |
|
883 | @property | |
877 | def rep_channel(self): |
|
884 | def rep_channel(self): | |
878 | """Get the REP socket channel object to handle stdin (raw_input).""" |
|
885 | """Get the REP socket channel object to handle stdin (raw_input).""" | |
879 | if self._rep_channel is None: |
|
886 | if self._rep_channel is None: | |
880 | self._rep_channel = self.rep_channel_class(self.context, |
|
887 | self._rep_channel = self.rep_channel_class(self.context, | |
881 | self.session, |
|
888 | self.session, | |
882 | self.rep_address) |
|
889 | self.rep_address) | |
883 | return self._rep_channel |
|
890 | return self._rep_channel | |
884 |
|
891 | |||
885 | @property |
|
892 | @property | |
886 | def hb_channel(self): |
|
893 | def hb_channel(self): | |
887 | """Get the REP socket channel object to handle stdin (raw_input).""" |
|
894 | """Get the REP socket channel object to handle stdin (raw_input).""" | |
888 | if self._hb_channel is None: |
|
895 | if self._hb_channel is None: | |
889 | self._hb_channel = self.hb_channel_class(self.context, |
|
896 | self._hb_channel = self.hb_channel_class(self.context, | |
890 | self.session, |
|
897 | self.session, | |
891 | self.hb_address) |
|
898 | self.hb_address) | |
892 | return self._hb_channel |
|
899 | return self._hb_channel |
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