Show More
@@ -0,0 +1,359 b'' | |||
|
1 | #!/usr/bin/env python | |
|
2 | """A simple interactive kernel that talks to a frontend over 0MQ. | |
|
3 | ||
|
4 | Things to do: | |
|
5 | ||
|
6 | * Implement `set_parent` logic. Right before doing exec, the Kernel should | |
|
7 | call set_parent on all the PUB objects with the message about to be executed. | |
|
8 | * Implement random port and security key logic. | |
|
9 | * Implement control messages. | |
|
10 | * Implement event loop and poll version. | |
|
11 | """ | |
|
12 | ||
|
13 | #----------------------------------------------------------------------------- | |
|
14 | # Imports | |
|
15 | #----------------------------------------------------------------------------- | |
|
16 | ||
|
17 | # Standard library imports. | |
|
18 | import __builtin__ | |
|
19 | from code import CommandCompiler | |
|
20 | import os | |
|
21 | import sys | |
|
22 | import time | |
|
23 | import traceback | |
|
24 | ||
|
25 | # System library imports. | |
|
26 | import zmq | |
|
27 | ||
|
28 | # Local imports. | |
|
29 | from IPython.external.argparse import ArgumentParser | |
|
30 | from session import Session, Message | |
|
31 | from completer import KernelCompleter | |
|
32 | from .iostream import OutStream | |
|
33 | from .displayhook import DisplayHook | |
|
34 | from .exitpoller import ExitPollerUnix, ExitPollerWindows | |
|
35 | ||
|
36 | #----------------------------------------------------------------------------- | |
|
37 | # Main kernel class | |
|
38 | #----------------------------------------------------------------------------- | |
|
39 | ||
|
40 | class Kernel(object): | |
|
41 | ||
|
42 | def __init__(self, session, reply_socket, pub_socket, req_socket): | |
|
43 | self.session = session | |
|
44 | self.reply_socket = reply_socket | |
|
45 | self.pub_socket = pub_socket | |
|
46 | self.req_socket = req_socket | |
|
47 | self.user_ns = {} | |
|
48 | self.history = [] | |
|
49 | self.compiler = CommandCompiler() | |
|
50 | self.completer = KernelCompleter(self.user_ns) | |
|
51 | ||
|
52 | # Build dict of handlers for message types | |
|
53 | msg_types = [ 'execute_request', 'complete_request', | |
|
54 | 'object_info_request' ] | |
|
55 | self.handlers = {} | |
|
56 | for msg_type in msg_types: | |
|
57 | self.handlers[msg_type] = getattr(self, msg_type) | |
|
58 | ||
|
59 | def abort_queue(self): | |
|
60 | while True: | |
|
61 | try: | |
|
62 | ident = self.reply_socket.recv(zmq.NOBLOCK) | |
|
63 | except zmq.ZMQError, e: | |
|
64 | if e.errno == zmq.EAGAIN: | |
|
65 | break | |
|
66 | else: | |
|
67 | assert self.reply_socket.rcvmore(), "Unexpected missing message part." | |
|
68 | msg = self.reply_socket.recv_json() | |
|
69 | print>>sys.__stdout__, "Aborting:" | |
|
70 | print>>sys.__stdout__, Message(msg) | |
|
71 | msg_type = msg['msg_type'] | |
|
72 | reply_type = msg_type.split('_')[0] + '_reply' | |
|
73 | reply_msg = self.session.msg(reply_type, {'status' : 'aborted'}, msg) | |
|
74 | print>>sys.__stdout__, Message(reply_msg) | |
|
75 | self.reply_socket.send(ident,zmq.SNDMORE) | |
|
76 | self.reply_socket.send_json(reply_msg) | |
|
77 | # We need to wait a bit for requests to come in. This can probably | |
|
78 | # be set shorter for true asynchronous clients. | |
|
79 | time.sleep(0.1) | |
|
80 | ||
|
81 | def execute_request(self, ident, parent): | |
|
82 | try: | |
|
83 | code = parent[u'content'][u'code'] | |
|
84 | except: | |
|
85 | print>>sys.__stderr__, "Got bad msg: " | |
|
86 | print>>sys.__stderr__, Message(parent) | |
|
87 | return | |
|
88 | pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent) | |
|
89 | self.pub_socket.send_json(pyin_msg) | |
|
90 | ||
|
91 | try: | |
|
92 | comp_code = self.compiler(code, '<zmq-kernel>') | |
|
93 | ||
|
94 | # Replace raw_input. Note that is not sufficient to replace | |
|
95 | # raw_input in the user namespace. | |
|
96 | raw_input = lambda prompt='': self.raw_input(prompt, ident, parent) | |
|
97 | __builtin__.raw_input = raw_input | |
|
98 | ||
|
99 | # Configure the display hook. | |
|
100 | sys.displayhook.set_parent(parent) | |
|
101 | ||
|
102 | exec comp_code in self.user_ns, self.user_ns | |
|
103 | except: | |
|
104 | etype, evalue, tb = sys.exc_info() | |
|
105 | tb = traceback.format_exception(etype, evalue, tb) | |
|
106 | exc_content = { | |
|
107 | u'status' : u'error', | |
|
108 | u'traceback' : tb, | |
|
109 | u'ename' : unicode(etype.__name__), | |
|
110 | u'evalue' : unicode(evalue) | |
|
111 | } | |
|
112 | exc_msg = self.session.msg(u'pyerr', exc_content, parent) | |
|
113 | self.pub_socket.send_json(exc_msg) | |
|
114 | reply_content = exc_content | |
|
115 | else: | |
|
116 | reply_content = {'status' : 'ok'} | |
|
117 | ||
|
118 | # Flush output before sending the reply. | |
|
119 | sys.stderr.flush() | |
|
120 | sys.stdout.flush() | |
|
121 | ||
|
122 | # Send the reply. | |
|
123 | reply_msg = self.session.msg(u'execute_reply', reply_content, parent) | |
|
124 | print>>sys.__stdout__, Message(reply_msg) | |
|
125 | self.reply_socket.send(ident, zmq.SNDMORE) | |
|
126 | self.reply_socket.send_json(reply_msg) | |
|
127 | if reply_msg['content']['status'] == u'error': | |
|
128 | self.abort_queue() | |
|
129 | ||
|
130 | def raw_input(self, prompt, ident, parent): | |
|
131 | # Flush output before making the request. | |
|
132 | sys.stderr.flush() | |
|
133 | sys.stdout.flush() | |
|
134 | ||
|
135 | # Send the input request. | |
|
136 | content = dict(prompt=prompt) | |
|
137 | msg = self.session.msg(u'input_request', content, parent) | |
|
138 | self.req_socket.send_json(msg) | |
|
139 | ||
|
140 | # Await a response. | |
|
141 | reply = self.req_socket.recv_json() | |
|
142 | try: | |
|
143 | value = reply['content']['value'] | |
|
144 | except: | |
|
145 | print>>sys.__stderr__, "Got bad raw_input reply: " | |
|
146 | print>>sys.__stderr__, Message(parent) | |
|
147 | value = '' | |
|
148 | return value | |
|
149 | ||
|
150 | def complete_request(self, ident, parent): | |
|
151 | matches = {'matches' : self.complete(parent), | |
|
152 | 'status' : 'ok'} | |
|
153 | completion_msg = self.session.send(self.reply_socket, 'complete_reply', | |
|
154 | matches, parent, ident) | |
|
155 | print >> sys.__stdout__, completion_msg | |
|
156 | ||
|
157 | def complete(self, msg): | |
|
158 | return self.completer.complete(msg.content.line, msg.content.text) | |
|
159 | ||
|
160 | def object_info_request(self, ident, parent): | |
|
161 | context = parent['content']['oname'].split('.') | |
|
162 | object_info = self.object_info(context) | |
|
163 | msg = self.session.send(self.reply_socket, 'object_info_reply', | |
|
164 | object_info, parent, ident) | |
|
165 | print >> sys.__stdout__, msg | |
|
166 | ||
|
167 | def object_info(self, context): | |
|
168 | symbol, leftover = self.symbol_from_context(context) | |
|
169 | if symbol is not None and not leftover: | |
|
170 | doc = getattr(symbol, '__doc__', '') | |
|
171 | else: | |
|
172 | doc = '' | |
|
173 | object_info = dict(docstring = doc) | |
|
174 | return object_info | |
|
175 | ||
|
176 | def symbol_from_context(self, context): | |
|
177 | if not context: | |
|
178 | return None, context | |
|
179 | ||
|
180 | base_symbol_string = context[0] | |
|
181 | symbol = self.user_ns.get(base_symbol_string, None) | |
|
182 | if symbol is None: | |
|
183 | symbol = __builtin__.__dict__.get(base_symbol_string, None) | |
|
184 | if symbol is None: | |
|
185 | return None, context | |
|
186 | ||
|
187 | context = context[1:] | |
|
188 | for i, name in enumerate(context): | |
|
189 | new_symbol = getattr(symbol, name, None) | |
|
190 | if new_symbol is None: | |
|
191 | return symbol, context[i:] | |
|
192 | else: | |
|
193 | symbol = new_symbol | |
|
194 | ||
|
195 | return symbol, [] | |
|
196 | ||
|
197 | def start(self): | |
|
198 | while True: | |
|
199 | ident = self.reply_socket.recv() | |
|
200 | assert self.reply_socket.rcvmore(), "Missing message part." | |
|
201 | msg = self.reply_socket.recv_json() | |
|
202 | omsg = Message(msg) | |
|
203 | print>>sys.__stdout__ | |
|
204 | print>>sys.__stdout__, omsg | |
|
205 | handler = self.handlers.get(omsg.msg_type, None) | |
|
206 | if handler is None: | |
|
207 | print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg | |
|
208 | else: | |
|
209 | handler(ident, omsg) | |
|
210 | ||
|
211 | #----------------------------------------------------------------------------- | |
|
212 | # Kernel main and launch functions | |
|
213 | #----------------------------------------------------------------------------- | |
|
214 | ||
|
215 | def bind_port(socket, ip, port): | |
|
216 | """ Binds the specified ZMQ socket. If the port is less than zero, a random | |
|
217 | port is chosen. Returns the port that was bound. | |
|
218 | """ | |
|
219 | connection = 'tcp://%s' % ip | |
|
220 | if port <= 0: | |
|
221 | port = socket.bind_to_random_port(connection) | |
|
222 | else: | |
|
223 | connection += ':%i' % port | |
|
224 | socket.bind(connection) | |
|
225 | return port | |
|
226 | ||
|
227 | ||
|
228 | def main(): | |
|
229 | """ Main entry point for launching a kernel. | |
|
230 | """ | |
|
231 | # Parse command line arguments. | |
|
232 | parser = ArgumentParser() | |
|
233 | parser.add_argument('--ip', type=str, default='127.0.0.1', | |
|
234 | help='set the kernel\'s IP address [default: local]') | |
|
235 | parser.add_argument('--xrep', type=int, metavar='PORT', default=0, | |
|
236 | help='set the XREP channel port [default: random]') | |
|
237 | parser.add_argument('--pub', type=int, metavar='PORT', default=0, | |
|
238 | help='set the PUB channel port [default: random]') | |
|
239 | parser.add_argument('--req', type=int, metavar='PORT', default=0, | |
|
240 | help='set the REQ channel port [default: random]') | |
|
241 | if sys.platform == 'win32': | |
|
242 | parser.add_argument('--parent', type=int, metavar='HANDLE', | |
|
243 | default=0, help='kill this process if the process ' | |
|
244 | 'with HANDLE dies') | |
|
245 | else: | |
|
246 | parser.add_argument('--parent', action='store_true', | |
|
247 | help='kill this process if its parent dies') | |
|
248 | namespace = parser.parse_args() | |
|
249 | ||
|
250 | # Create a context, a session, and the kernel sockets. | |
|
251 | print >>sys.__stdout__, "Starting the kernel..." | |
|
252 | context = zmq.Context() | |
|
253 | session = Session(username=u'kernel') | |
|
254 | ||
|
255 | reply_socket = context.socket(zmq.XREP) | |
|
256 | xrep_port = bind_port(reply_socket, namespace.ip, namespace.xrep) | |
|
257 | print >>sys.__stdout__, "XREP Channel on port", xrep_port | |
|
258 | ||
|
259 | pub_socket = context.socket(zmq.PUB) | |
|
260 | pub_port = bind_port(pub_socket, namespace.ip, namespace.pub) | |
|
261 | print >>sys.__stdout__, "PUB Channel on port", pub_port | |
|
262 | ||
|
263 | req_socket = context.socket(zmq.XREQ) | |
|
264 | req_port = bind_port(req_socket, namespace.ip, namespace.req) | |
|
265 | print >>sys.__stdout__, "REQ Channel on port", req_port | |
|
266 | ||
|
267 | # Redirect input streams and set a display hook. | |
|
268 | sys.stdout = OutStream(session, pub_socket, u'stdout') | |
|
269 | sys.stderr = OutStream(session, pub_socket, u'stderr') | |
|
270 | sys.displayhook = DisplayHook(session, pub_socket) | |
|
271 | ||
|
272 | # Create the kernel. | |
|
273 | kernel = Kernel(session, reply_socket, pub_socket, req_socket) | |
|
274 | ||
|
275 | # Configure this kernel/process to die on parent termination, if necessary. | |
|
276 | if namespace.parent: | |
|
277 | if sys.platform == 'win32': | |
|
278 | poller = ExitPollerWindows(namespace.parent) | |
|
279 | else: | |
|
280 | poller = ExitPollerUnix() | |
|
281 | poller.start() | |
|
282 | ||
|
283 | # Start the kernel mainloop. | |
|
284 | kernel.start() | |
|
285 | ||
|
286 | ||
|
287 | def launch_kernel(xrep_port=0, pub_port=0, req_port=0, independent=False): | |
|
288 | """ Launches a localhost kernel, binding to the specified ports. | |
|
289 | ||
|
290 | Parameters | |
|
291 | ---------- | |
|
292 | xrep_port : int, optional | |
|
293 | The port to use for XREP channel. | |
|
294 | ||
|
295 | pub_port : int, optional | |
|
296 | The port to use for the SUB channel. | |
|
297 | ||
|
298 | req_port : int, optional | |
|
299 | The port to use for the REQ (raw input) channel. | |
|
300 | ||
|
301 | independent : bool, optional (default False) | |
|
302 | If set, the kernel process is guaranteed to survive if this process | |
|
303 | dies. If not set, an effort is made to ensure that the kernel is killed | |
|
304 | when this process dies. Note that in this case it is still good practice | |
|
305 | to kill kernels manually before exiting. | |
|
306 | ||
|
307 | Returns | |
|
308 | ------- | |
|
309 | A tuple of form: | |
|
310 | (kernel_process, xrep_port, pub_port, req_port) | |
|
311 | where kernel_process is a Popen object and the ports are integers. | |
|
312 | """ | |
|
313 | import socket | |
|
314 | from subprocess import Popen | |
|
315 | ||
|
316 | # Find open ports as necessary. | |
|
317 | ports = [] | |
|
318 | ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + int(req_port <= 0) | |
|
319 | for i in xrange(ports_needed): | |
|
320 | sock = socket.socket() | |
|
321 | sock.bind(('', 0)) | |
|
322 | ports.append(sock) | |
|
323 | for i, sock in enumerate(ports): | |
|
324 | port = sock.getsockname()[1] | |
|
325 | sock.close() | |
|
326 | ports[i] = port | |
|
327 | if xrep_port <= 0: | |
|
328 | xrep_port = ports.pop(0) | |
|
329 | if pub_port <= 0: | |
|
330 | pub_port = ports.pop(0) | |
|
331 | if req_port <= 0: | |
|
332 | req_port = ports.pop(0) | |
|
333 | ||
|
334 | # Spawn a kernel. | |
|
335 | command = 'from IPython.zmq.pykernel import main; main()' | |
|
336 | arguments = [ sys.executable, '-c', command, '--xrep', str(xrep_port), | |
|
337 | '--pub', str(pub_port), '--req', str(req_port) ] | |
|
338 | if independent: | |
|
339 | if sys.platform == 'win32': | |
|
340 | proc = Popen(['start', '/b'] + arguments, shell=True) | |
|
341 | else: | |
|
342 | proc = Popen(arguments, preexec_fn=lambda: os.setsid()) | |
|
343 | else: | |
|
344 | if sys.platform == 'win32': | |
|
345 | from _subprocess import DuplicateHandle, GetCurrentProcess, \ | |
|
346 | DUPLICATE_SAME_ACCESS | |
|
347 | pid = GetCurrentProcess() | |
|
348 | handle = DuplicateHandle(pid, pid, pid, 0, | |
|
349 | True, # Inheritable by new processes. | |
|
350 | DUPLICATE_SAME_ACCESS) | |
|
351 | proc = Popen(arguments + ['--parent', str(int(handle))]) | |
|
352 | else: | |
|
353 | proc = Popen(arguments + ['--parent']) | |
|
354 | ||
|
355 | return proc, xrep_port, pub_port, req_port | |
|
356 | ||
|
357 | ||
|
358 | if __name__ == '__main__': | |
|
359 | main() |
@@ -1,359 +1,359 b'' | |||
|
1 | 1 | #!/usr/bin/env python |
|
2 | 2 | """A simple interactive kernel that talks to a frontend over 0MQ. |
|
3 | 3 | |
|
4 | 4 | Things to do: |
|
5 | 5 | |
|
6 | 6 | * Implement `set_parent` logic. Right before doing exec, the Kernel should |
|
7 | 7 | call set_parent on all the PUB objects with the message about to be executed. |
|
8 | 8 | * Implement random port and security key logic. |
|
9 | 9 | * Implement control messages. |
|
10 | 10 | * Implement event loop and poll version. |
|
11 | 11 | """ |
|
12 | 12 | |
|
13 | 13 | #----------------------------------------------------------------------------- |
|
14 | 14 | # Imports |
|
15 | 15 | #----------------------------------------------------------------------------- |
|
16 | 16 | |
|
17 | 17 | # Standard library imports. |
|
18 | 18 | import __builtin__ |
|
19 | 19 | from code import CommandCompiler |
|
20 | 20 | import os |
|
21 | 21 | import sys |
|
22 | 22 | import time |
|
23 | 23 | import traceback |
|
24 | 24 | |
|
25 | 25 | # System library imports. |
|
26 | 26 | import zmq |
|
27 | 27 | |
|
28 | 28 | # Local imports. |
|
29 | 29 | from IPython.external.argparse import ArgumentParser |
|
30 | 30 | from session import Session, Message |
|
31 | 31 | from completer import KernelCompleter |
|
32 | 32 | from .iostream import OutStream |
|
33 | 33 | from .displayhook import DisplayHook |
|
34 | 34 | from .exitpoller import ExitPollerUnix, ExitPollerWindows |
|
35 | 35 | |
|
36 | 36 | #----------------------------------------------------------------------------- |
|
37 | 37 | # Main kernel class |
|
38 | 38 | #----------------------------------------------------------------------------- |
|
39 | 39 | |
|
40 | 40 | class Kernel(object): |
|
41 | 41 | |
|
42 | 42 | def __init__(self, session, reply_socket, pub_socket, req_socket): |
|
43 | 43 | self.session = session |
|
44 | 44 | self.reply_socket = reply_socket |
|
45 | 45 | self.pub_socket = pub_socket |
|
46 | 46 | self.req_socket = req_socket |
|
47 | 47 | self.user_ns = {} |
|
48 | 48 | self.history = [] |
|
49 | 49 | self.compiler = CommandCompiler() |
|
50 | 50 | self.completer = KernelCompleter(self.user_ns) |
|
51 | 51 | |
|
52 | 52 | # Build dict of handlers for message types |
|
53 | 53 | msg_types = [ 'execute_request', 'complete_request', |
|
54 | 54 | 'object_info_request' ] |
|
55 | 55 | self.handlers = {} |
|
56 | 56 | for msg_type in msg_types: |
|
57 | 57 | self.handlers[msg_type] = getattr(self, msg_type) |
|
58 | 58 | |
|
59 | 59 | def abort_queue(self): |
|
60 | 60 | while True: |
|
61 | 61 | try: |
|
62 | 62 | ident = self.reply_socket.recv(zmq.NOBLOCK) |
|
63 | 63 | except zmq.ZMQError, e: |
|
64 | 64 | if e.errno == zmq.EAGAIN: |
|
65 | 65 | break |
|
66 | 66 | else: |
|
67 | 67 | assert self.reply_socket.rcvmore(), "Unexpected missing message part." |
|
68 | 68 | msg = self.reply_socket.recv_json() |
|
69 | 69 | print>>sys.__stdout__, "Aborting:" |
|
70 | 70 | print>>sys.__stdout__, Message(msg) |
|
71 | 71 | msg_type = msg['msg_type'] |
|
72 | 72 | reply_type = msg_type.split('_')[0] + '_reply' |
|
73 | 73 | reply_msg = self.session.msg(reply_type, {'status' : 'aborted'}, msg) |
|
74 | 74 | print>>sys.__stdout__, Message(reply_msg) |
|
75 | 75 | self.reply_socket.send(ident,zmq.SNDMORE) |
|
76 | 76 | self.reply_socket.send_json(reply_msg) |
|
77 | 77 | # We need to wait a bit for requests to come in. This can probably |
|
78 | 78 | # be set shorter for true asynchronous clients. |
|
79 | 79 | time.sleep(0.1) |
|
80 | 80 | |
|
81 | 81 | def execute_request(self, ident, parent): |
|
82 | 82 | try: |
|
83 | 83 | code = parent[u'content'][u'code'] |
|
84 | 84 | except: |
|
85 | 85 | print>>sys.__stderr__, "Got bad msg: " |
|
86 | 86 | print>>sys.__stderr__, Message(parent) |
|
87 | 87 | return |
|
88 | 88 | pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent) |
|
89 | 89 | self.pub_socket.send_json(pyin_msg) |
|
90 | 90 | |
|
91 | 91 | try: |
|
92 | 92 | comp_code = self.compiler(code, '<zmq-kernel>') |
|
93 | 93 | |
|
94 | 94 | # Replace raw_input. Note that is not sufficient to replace |
|
95 | 95 | # raw_input in the user namespace. |
|
96 | 96 | raw_input = lambda prompt='': self.raw_input(prompt, ident, parent) |
|
97 | 97 | __builtin__.raw_input = raw_input |
|
98 | 98 | |
|
99 | 99 | # Configure the display hook. |
|
100 | 100 | sys.displayhook.set_parent(parent) |
|
101 | 101 | |
|
102 | 102 | exec comp_code in self.user_ns, self.user_ns |
|
103 | 103 | except: |
|
104 | 104 | etype, evalue, tb = sys.exc_info() |
|
105 | 105 | tb = traceback.format_exception(etype, evalue, tb) |
|
106 | 106 | exc_content = { |
|
107 | 107 | u'status' : u'error', |
|
108 | 108 | u'traceback' : tb, |
|
109 | 109 | u'ename' : unicode(etype.__name__), |
|
110 | 110 | u'evalue' : unicode(evalue) |
|
111 | 111 | } |
|
112 | 112 | exc_msg = self.session.msg(u'pyerr', exc_content, parent) |
|
113 | 113 | self.pub_socket.send_json(exc_msg) |
|
114 | 114 | reply_content = exc_content |
|
115 | 115 | else: |
|
116 | 116 | reply_content = {'status' : 'ok'} |
|
117 | 117 | |
|
118 | 118 | # Flush output before sending the reply. |
|
119 | 119 | sys.stderr.flush() |
|
120 | 120 | sys.stdout.flush() |
|
121 | 121 | |
|
122 | 122 | # Send the reply. |
|
123 | 123 | reply_msg = self.session.msg(u'execute_reply', reply_content, parent) |
|
124 | 124 | print>>sys.__stdout__, Message(reply_msg) |
|
125 | 125 | self.reply_socket.send(ident, zmq.SNDMORE) |
|
126 | 126 | self.reply_socket.send_json(reply_msg) |
|
127 | 127 | if reply_msg['content']['status'] == u'error': |
|
128 | 128 | self.abort_queue() |
|
129 | 129 | |
|
130 | 130 | def raw_input(self, prompt, ident, parent): |
|
131 | 131 | # Flush output before making the request. |
|
132 | 132 | sys.stderr.flush() |
|
133 | 133 | sys.stdout.flush() |
|
134 | 134 | |
|
135 | 135 | # Send the input request. |
|
136 | 136 | content = dict(prompt=prompt) |
|
137 | 137 | msg = self.session.msg(u'input_request', content, parent) |
|
138 | 138 | self.req_socket.send_json(msg) |
|
139 | 139 | |
|
140 | 140 | # Await a response. |
|
141 | 141 | reply = self.req_socket.recv_json() |
|
142 | 142 | try: |
|
143 | 143 | value = reply['content']['value'] |
|
144 | 144 | except: |
|
145 | 145 | print>>sys.__stderr__, "Got bad raw_input reply: " |
|
146 | 146 | print>>sys.__stderr__, Message(parent) |
|
147 | 147 | value = '' |
|
148 | 148 | return value |
|
149 | 149 | |
|
150 | 150 | def complete_request(self, ident, parent): |
|
151 | 151 | matches = {'matches' : self.complete(parent), |
|
152 | 152 | 'status' : 'ok'} |
|
153 | 153 | completion_msg = self.session.send(self.reply_socket, 'complete_reply', |
|
154 | 154 | matches, parent, ident) |
|
155 | 155 | print >> sys.__stdout__, completion_msg |
|
156 | 156 | |
|
157 | 157 | def complete(self, msg): |
|
158 | 158 | return self.completer.complete(msg.content.line, msg.content.text) |
|
159 | 159 | |
|
160 | 160 | def object_info_request(self, ident, parent): |
|
161 | 161 | context = parent['content']['oname'].split('.') |
|
162 | 162 | object_info = self.object_info(context) |
|
163 | 163 | msg = self.session.send(self.reply_socket, 'object_info_reply', |
|
164 | 164 | object_info, parent, ident) |
|
165 | 165 | print >> sys.__stdout__, msg |
|
166 | 166 | |
|
167 | 167 | def object_info(self, context): |
|
168 | 168 | symbol, leftover = self.symbol_from_context(context) |
|
169 | 169 | if symbol is not None and not leftover: |
|
170 | 170 | doc = getattr(symbol, '__doc__', '') |
|
171 | 171 | else: |
|
172 | 172 | doc = '' |
|
173 | 173 | object_info = dict(docstring = doc) |
|
174 | 174 | return object_info |
|
175 | 175 | |
|
176 | 176 | def symbol_from_context(self, context): |
|
177 | 177 | if not context: |
|
178 | 178 | return None, context |
|
179 | 179 | |
|
180 | 180 | base_symbol_string = context[0] |
|
181 | 181 | symbol = self.user_ns.get(base_symbol_string, None) |
|
182 | 182 | if symbol is None: |
|
183 | 183 | symbol = __builtin__.__dict__.get(base_symbol_string, None) |
|
184 | 184 | if symbol is None: |
|
185 | 185 | return None, context |
|
186 | 186 | |
|
187 | 187 | context = context[1:] |
|
188 | 188 | for i, name in enumerate(context): |
|
189 | 189 | new_symbol = getattr(symbol, name, None) |
|
190 | 190 | if new_symbol is None: |
|
191 | 191 | return symbol, context[i:] |
|
192 | 192 | else: |
|
193 | 193 | symbol = new_symbol |
|
194 | 194 | |
|
195 | 195 | return symbol, [] |
|
196 | 196 | |
|
197 | 197 | def start(self): |
|
198 | 198 | while True: |
|
199 | 199 | ident = self.reply_socket.recv() |
|
200 | 200 | assert self.reply_socket.rcvmore(), "Missing message part." |
|
201 | 201 | msg = self.reply_socket.recv_json() |
|
202 | 202 | omsg = Message(msg) |
|
203 | 203 | print>>sys.__stdout__ |
|
204 | 204 | print>>sys.__stdout__, omsg |
|
205 | 205 | handler = self.handlers.get(omsg.msg_type, None) |
|
206 | 206 | if handler is None: |
|
207 | 207 | print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg |
|
208 | 208 | else: |
|
209 | 209 | handler(ident, omsg) |
|
210 | 210 | |
|
211 | 211 | #----------------------------------------------------------------------------- |
|
212 | 212 | # Kernel main and launch functions |
|
213 | 213 | #----------------------------------------------------------------------------- |
|
214 | 214 | |
|
215 | 215 | def bind_port(socket, ip, port): |
|
216 | 216 | """ Binds the specified ZMQ socket. If the port is less than zero, a random |
|
217 | 217 | port is chosen. Returns the port that was bound. |
|
218 | 218 | """ |
|
219 | 219 | connection = 'tcp://%s' % ip |
|
220 | 220 | if port <= 0: |
|
221 | 221 | port = socket.bind_to_random_port(connection) |
|
222 | 222 | else: |
|
223 | 223 | connection += ':%i' % port |
|
224 | 224 | socket.bind(connection) |
|
225 | 225 | return port |
|
226 | 226 | |
|
227 | 227 | |
|
228 | 228 | def main(): |
|
229 | 229 | """ Main entry point for launching a kernel. |
|
230 | 230 | """ |
|
231 | 231 | # Parse command line arguments. |
|
232 | 232 | parser = ArgumentParser() |
|
233 | 233 | parser.add_argument('--ip', type=str, default='127.0.0.1', |
|
234 | 234 | help='set the kernel\'s IP address [default: local]') |
|
235 | 235 | parser.add_argument('--xrep', type=int, metavar='PORT', default=0, |
|
236 | 236 | help='set the XREP channel port [default: random]') |
|
237 | 237 | parser.add_argument('--pub', type=int, metavar='PORT', default=0, |
|
238 | 238 | help='set the PUB channel port [default: random]') |
|
239 | 239 | parser.add_argument('--req', type=int, metavar='PORT', default=0, |
|
240 | 240 | help='set the REQ channel port [default: random]') |
|
241 | 241 | if sys.platform == 'win32': |
|
242 | 242 | parser.add_argument('--parent', type=int, metavar='HANDLE', |
|
243 | 243 | default=0, help='kill this process if the process ' |
|
244 | 244 | 'with HANDLE dies') |
|
245 | 245 | else: |
|
246 | 246 | parser.add_argument('--parent', action='store_true', |
|
247 | 247 | help='kill this process if its parent dies') |
|
248 | 248 | namespace = parser.parse_args() |
|
249 | 249 | |
|
250 | 250 | # Create a context, a session, and the kernel sockets. |
|
251 | 251 | print >>sys.__stdout__, "Starting the kernel..." |
|
252 | 252 | context = zmq.Context() |
|
253 | 253 | session = Session(username=u'kernel') |
|
254 | 254 | |
|
255 | 255 | reply_socket = context.socket(zmq.XREP) |
|
256 | 256 | xrep_port = bind_port(reply_socket, namespace.ip, namespace.xrep) |
|
257 | 257 | print >>sys.__stdout__, "XREP Channel on port", xrep_port |
|
258 | 258 | |
|
259 | 259 | pub_socket = context.socket(zmq.PUB) |
|
260 | 260 | pub_port = bind_port(pub_socket, namespace.ip, namespace.pub) |
|
261 | 261 | print >>sys.__stdout__, "PUB Channel on port", pub_port |
|
262 | 262 | |
|
263 | 263 | req_socket = context.socket(zmq.XREQ) |
|
264 | 264 | req_port = bind_port(req_socket, namespace.ip, namespace.req) |
|
265 | 265 | print >>sys.__stdout__, "REQ Channel on port", req_port |
|
266 | 266 | |
|
267 | 267 | # Redirect input streams and set a display hook. |
|
268 | 268 | sys.stdout = OutStream(session, pub_socket, u'stdout') |
|
269 | 269 | sys.stderr = OutStream(session, pub_socket, u'stderr') |
|
270 | 270 | sys.displayhook = DisplayHook(session, pub_socket) |
|
271 | 271 | |
|
272 | 272 | # Create the kernel. |
|
273 | 273 | kernel = Kernel(session, reply_socket, pub_socket, req_socket) |
|
274 | 274 | |
|
275 | 275 | # Configure this kernel/process to die on parent termination, if necessary. |
|
276 | 276 | if namespace.parent: |
|
277 | 277 | if sys.platform == 'win32': |
|
278 | 278 | poller = ExitPollerWindows(namespace.parent) |
|
279 | 279 | else: |
|
280 | 280 | poller = ExitPollerUnix() |
|
281 | 281 | poller.start() |
|
282 | 282 | |
|
283 | 283 | # Start the kernel mainloop. |
|
284 | 284 | kernel.start() |
|
285 | 285 | |
|
286 | 286 | |
|
287 | 287 | def launch_kernel(xrep_port=0, pub_port=0, req_port=0, independent=False): |
|
288 | 288 | """ Launches a localhost kernel, binding to the specified ports. |
|
289 | 289 | |
|
290 | 290 | Parameters |
|
291 | 291 | ---------- |
|
292 | 292 | xrep_port : int, optional |
|
293 | 293 | The port to use for XREP channel. |
|
294 | 294 | |
|
295 | 295 | pub_port : int, optional |
|
296 | 296 | The port to use for the SUB channel. |
|
297 | 297 | |
|
298 | 298 | req_port : int, optional |
|
299 | 299 | The port to use for the REQ (raw input) channel. |
|
300 | 300 | |
|
301 | 301 | independent : bool, optional (default False) |
|
302 | 302 | If set, the kernel process is guaranteed to survive if this process |
|
303 | 303 | dies. If not set, an effort is made to ensure that the kernel is killed |
|
304 | 304 | when this process dies. Note that in this case it is still good practice |
|
305 | 305 | to kill kernels manually before exiting. |
|
306 | 306 | |
|
307 | 307 | Returns |
|
308 | 308 | ------- |
|
309 | 309 | A tuple of form: |
|
310 | 310 | (kernel_process, xrep_port, pub_port, req_port) |
|
311 | 311 | where kernel_process is a Popen object and the ports are integers. |
|
312 | 312 | """ |
|
313 | 313 | import socket |
|
314 | 314 | from subprocess import Popen |
|
315 | 315 | |
|
316 | 316 | # Find open ports as necessary. |
|
317 | 317 | ports = [] |
|
318 | 318 | ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + int(req_port <= 0) |
|
319 | 319 | for i in xrange(ports_needed): |
|
320 | 320 | sock = socket.socket() |
|
321 | 321 | sock.bind(('', 0)) |
|
322 | 322 | ports.append(sock) |
|
323 | 323 | for i, sock in enumerate(ports): |
|
324 | 324 | port = sock.getsockname()[1] |
|
325 | 325 | sock.close() |
|
326 | 326 | ports[i] = port |
|
327 | 327 | if xrep_port <= 0: |
|
328 | 328 | xrep_port = ports.pop(0) |
|
329 | 329 | if pub_port <= 0: |
|
330 | 330 | pub_port = ports.pop(0) |
|
331 | 331 | if req_port <= 0: |
|
332 | 332 | req_port = ports.pop(0) |
|
333 | 333 | |
|
334 | 334 | # Spawn a kernel. |
|
335 | command = 'from IPython.zmq.kernel import main; main()' | |
|
335 | command = 'from IPython.zmq.ipkernel import main; main()' | |
|
336 | 336 | arguments = [ sys.executable, '-c', command, '--xrep', str(xrep_port), |
|
337 | 337 | '--pub', str(pub_port), '--req', str(req_port) ] |
|
338 | 338 | if independent: |
|
339 | 339 | if sys.platform == 'win32': |
|
340 | 340 | proc = Popen(['start', '/b'] + arguments, shell=True) |
|
341 | 341 | else: |
|
342 | 342 | proc = Popen(arguments, preexec_fn=lambda: os.setsid()) |
|
343 | 343 | else: |
|
344 | 344 | if sys.platform == 'win32': |
|
345 | 345 | from _subprocess import DuplicateHandle, GetCurrentProcess, \ |
|
346 | 346 | DUPLICATE_SAME_ACCESS |
|
347 | 347 | pid = GetCurrentProcess() |
|
348 | 348 | handle = DuplicateHandle(pid, pid, pid, 0, |
|
349 | 349 | True, # Inheritable by new processes. |
|
350 | 350 | DUPLICATE_SAME_ACCESS) |
|
351 | 351 | proc = Popen(arguments + ['--parent', str(int(handle))]) |
|
352 | 352 | else: |
|
353 | 353 | proc = Popen(arguments + ['--parent']) |
|
354 | 354 | |
|
355 | 355 | return proc, xrep_port, pub_port, req_port |
|
356 | 356 | |
|
357 | 357 | |
|
358 | 358 | if __name__ == '__main__': |
|
359 | 359 | main() |
@@ -1,571 +1,571 b'' | |||
|
1 | 1 | """Base classes to manage the interaction with a running kernel. |
|
2 | 2 | |
|
3 | 3 | Todo |
|
4 | 4 | ==== |
|
5 | 5 | |
|
6 | 6 | * Create logger to handle debugging and console messages. |
|
7 | 7 | """ |
|
8 | 8 | |
|
9 | 9 | #----------------------------------------------------------------------------- |
|
10 | 10 | # Copyright (C) 2008-2010 The IPython Development Team |
|
11 | 11 | # |
|
12 | 12 | # Distributed under the terms of the BSD License. The full license is in |
|
13 | 13 | # the file COPYING, distributed as part of this software. |
|
14 | 14 | #----------------------------------------------------------------------------- |
|
15 | 15 | |
|
16 | 16 | #----------------------------------------------------------------------------- |
|
17 | 17 | # Imports |
|
18 | 18 | #----------------------------------------------------------------------------- |
|
19 | 19 | |
|
20 | 20 | # Standard library imports. |
|
21 | 21 | from Queue import Queue, Empty |
|
22 | 22 | from subprocess import Popen |
|
23 | 23 | from threading import Thread |
|
24 | 24 | import time |
|
25 | 25 | |
|
26 | 26 | # System library imports. |
|
27 | 27 | import zmq |
|
28 | 28 | from zmq import POLLIN, POLLOUT, POLLERR |
|
29 | 29 | from zmq.eventloop import ioloop |
|
30 | 30 | |
|
31 | 31 | # Local imports. |
|
32 | 32 | from IPython.utils.traitlets import HasTraits, Any, Instance, Type, TCPAddress |
|
33 | from kernel import launch_kernel | |
|
33 | from .ipkernel import launch_kernel | |
|
34 | 34 | from session import Session |
|
35 | 35 | |
|
36 | 36 | #----------------------------------------------------------------------------- |
|
37 | 37 | # Constants and exceptions |
|
38 | 38 | #----------------------------------------------------------------------------- |
|
39 | 39 | |
|
40 | 40 | LOCALHOST = '127.0.0.1' |
|
41 | 41 | |
|
42 | 42 | class InvalidPortNumber(Exception): |
|
43 | 43 | pass |
|
44 | 44 | |
|
45 | 45 | #----------------------------------------------------------------------------- |
|
46 | 46 | # ZMQ Socket Channel classes |
|
47 | 47 | #----------------------------------------------------------------------------- |
|
48 | 48 | |
|
49 | 49 | class ZmqSocketChannel(Thread): |
|
50 | 50 | """The base class for the channels that use ZMQ sockets. |
|
51 | 51 | """ |
|
52 | 52 | context = None |
|
53 | 53 | session = None |
|
54 | 54 | socket = None |
|
55 | 55 | ioloop = None |
|
56 | 56 | iostate = None |
|
57 | 57 | _address = None |
|
58 | 58 | |
|
59 | 59 | def __init__(self, context, session, address): |
|
60 | 60 | """Create a channel |
|
61 | 61 | |
|
62 | 62 | Parameters |
|
63 | 63 | ---------- |
|
64 | 64 | context : :class:`zmq.Context` |
|
65 | 65 | The ZMQ context to use. |
|
66 | 66 | session : :class:`session.Session` |
|
67 | 67 | The session to use. |
|
68 | 68 | address : tuple |
|
69 | 69 | Standard (ip, port) tuple that the kernel is listening on. |
|
70 | 70 | """ |
|
71 | 71 | super(ZmqSocketChannel, self).__init__() |
|
72 | 72 | self.daemon = True |
|
73 | 73 | |
|
74 | 74 | self.context = context |
|
75 | 75 | self.session = session |
|
76 | 76 | if address[1] == 0: |
|
77 | 77 | message = 'The port number for a channel cannot be 0.' |
|
78 | 78 | raise InvalidPortNumber(message) |
|
79 | 79 | self._address = address |
|
80 | 80 | |
|
81 | 81 | def stop(self): |
|
82 | 82 | """Stop the channel's activity. |
|
83 | 83 | |
|
84 | 84 | This calls :method:`Thread.join` and returns when the thread |
|
85 | 85 | terminates. :class:`RuntimeError` will be raised if |
|
86 | 86 | :method:`self.start` is called again. |
|
87 | 87 | """ |
|
88 | 88 | self.join() |
|
89 | 89 | |
|
90 | 90 | @property |
|
91 | 91 | def address(self): |
|
92 | 92 | """Get the channel's address as an (ip, port) tuple. |
|
93 | 93 | |
|
94 | 94 | By the default, the address is (localhost, 0), where 0 means a random |
|
95 | 95 | port. |
|
96 | 96 | """ |
|
97 | 97 | return self._address |
|
98 | 98 | |
|
99 | 99 | def add_io_state(self, state): |
|
100 | 100 | """Add IO state to the eventloop. |
|
101 | 101 | |
|
102 | 102 | Parameters |
|
103 | 103 | ---------- |
|
104 | 104 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
|
105 | 105 | The IO state flag to set. |
|
106 | 106 | |
|
107 | 107 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
|
108 | 108 | """ |
|
109 | 109 | def add_io_state_callback(): |
|
110 | 110 | if not self.iostate & state: |
|
111 | 111 | self.iostate = self.iostate | state |
|
112 | 112 | self.ioloop.update_handler(self.socket, self.iostate) |
|
113 | 113 | self.ioloop.add_callback(add_io_state_callback) |
|
114 | 114 | |
|
115 | 115 | def drop_io_state(self, state): |
|
116 | 116 | """Drop IO state from the eventloop. |
|
117 | 117 | |
|
118 | 118 | Parameters |
|
119 | 119 | ---------- |
|
120 | 120 | state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR |
|
121 | 121 | The IO state flag to set. |
|
122 | 122 | |
|
123 | 123 | This is thread safe as it uses the thread safe IOLoop.add_callback. |
|
124 | 124 | """ |
|
125 | 125 | def drop_io_state_callback(): |
|
126 | 126 | if self.iostate & state: |
|
127 | 127 | self.iostate = self.iostate & (~state) |
|
128 | 128 | self.ioloop.update_handler(self.socket, self.iostate) |
|
129 | 129 | self.ioloop.add_callback(drop_io_state_callback) |
|
130 | 130 | |
|
131 | 131 | |
|
132 | 132 | class XReqSocketChannel(ZmqSocketChannel): |
|
133 | 133 | """The XREQ channel for issues request/replies to the kernel. |
|
134 | 134 | """ |
|
135 | 135 | |
|
136 | 136 | command_queue = None |
|
137 | 137 | |
|
138 | 138 | def __init__(self, context, session, address): |
|
139 | 139 | self.command_queue = Queue() |
|
140 | 140 | super(XReqSocketChannel, self).__init__(context, session, address) |
|
141 | 141 | |
|
142 | 142 | def run(self): |
|
143 | 143 | """The thread's main activity. Call start() instead.""" |
|
144 | 144 | self.socket = self.context.socket(zmq.XREQ) |
|
145 | 145 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
146 | 146 | self.socket.connect('tcp://%s:%i' % self.address) |
|
147 | 147 | self.ioloop = ioloop.IOLoop() |
|
148 | 148 | self.iostate = POLLERR|POLLIN |
|
149 | 149 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
150 | 150 | self.iostate) |
|
151 | 151 | self.ioloop.start() |
|
152 | 152 | |
|
153 | 153 | def stop(self): |
|
154 | 154 | self.ioloop.stop() |
|
155 | 155 | super(XReqSocketChannel, self).stop() |
|
156 | 156 | |
|
157 | 157 | def call_handlers(self, msg): |
|
158 | 158 | """This method is called in the ioloop thread when a message arrives. |
|
159 | 159 | |
|
160 | 160 | Subclasses should override this method to handle incoming messages. |
|
161 | 161 | It is important to remember that this method is called in the thread |
|
162 | 162 | so that some logic must be done to ensure that the application leve |
|
163 | 163 | handlers are called in the application thread. |
|
164 | 164 | """ |
|
165 | 165 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
166 | 166 | |
|
167 | 167 | def execute(self, code): |
|
168 | 168 | """Execute code in the kernel. |
|
169 | 169 | |
|
170 | 170 | Parameters |
|
171 | 171 | ---------- |
|
172 | 172 | code : str |
|
173 | 173 | A string of Python code. |
|
174 | 174 | |
|
175 | 175 | Returns |
|
176 | 176 | ------- |
|
177 | 177 | The msg_id of the message sent. |
|
178 | 178 | """ |
|
179 | 179 | # Create class for content/msg creation. Related to, but possibly |
|
180 | 180 | # not in Session. |
|
181 | 181 | content = dict(code=code) |
|
182 | 182 | msg = self.session.msg('execute_request', content) |
|
183 | 183 | self._queue_request(msg) |
|
184 | 184 | return msg['header']['msg_id'] |
|
185 | 185 | |
|
186 | 186 | def complete(self, text, line, block=None): |
|
187 | 187 | """Tab complete text, line, block in the kernel's namespace. |
|
188 | 188 | |
|
189 | 189 | Parameters |
|
190 | 190 | ---------- |
|
191 | 191 | text : str |
|
192 | 192 | The text to complete. |
|
193 | 193 | line : str |
|
194 | 194 | The full line of text that is the surrounding context for the |
|
195 | 195 | text to complete. |
|
196 | 196 | block : str |
|
197 | 197 | The full block of code in which the completion is being requested. |
|
198 | 198 | |
|
199 | 199 | Returns |
|
200 | 200 | ------- |
|
201 | 201 | The msg_id of the message sent. |
|
202 | 202 | """ |
|
203 | 203 | content = dict(text=text, line=line) |
|
204 | 204 | msg = self.session.msg('complete_request', content) |
|
205 | 205 | self._queue_request(msg) |
|
206 | 206 | return msg['header']['msg_id'] |
|
207 | 207 | |
|
208 | 208 | def object_info(self, oname): |
|
209 | 209 | """Get metadata information about an object. |
|
210 | 210 | |
|
211 | 211 | Parameters |
|
212 | 212 | ---------- |
|
213 | 213 | oname : str |
|
214 | 214 | A string specifying the object name. |
|
215 | 215 | |
|
216 | 216 | Returns |
|
217 | 217 | ------- |
|
218 | 218 | The msg_id of the message sent. |
|
219 | 219 | """ |
|
220 | 220 | content = dict(oname=oname) |
|
221 | 221 | msg = self.session.msg('object_info_request', content) |
|
222 | 222 | self._queue_request(msg) |
|
223 | 223 | return msg['header']['msg_id'] |
|
224 | 224 | |
|
225 | 225 | def _handle_events(self, socket, events): |
|
226 | 226 | if events & POLLERR: |
|
227 | 227 | self._handle_err() |
|
228 | 228 | if events & POLLOUT: |
|
229 | 229 | self._handle_send() |
|
230 | 230 | if events & POLLIN: |
|
231 | 231 | self._handle_recv() |
|
232 | 232 | |
|
233 | 233 | def _handle_recv(self): |
|
234 | 234 | msg = self.socket.recv_json() |
|
235 | 235 | self.call_handlers(msg) |
|
236 | 236 | |
|
237 | 237 | def _handle_send(self): |
|
238 | 238 | try: |
|
239 | 239 | msg = self.command_queue.get(False) |
|
240 | 240 | except Empty: |
|
241 | 241 | pass |
|
242 | 242 | else: |
|
243 | 243 | self.socket.send_json(msg) |
|
244 | 244 | if self.command_queue.empty(): |
|
245 | 245 | self.drop_io_state(POLLOUT) |
|
246 | 246 | |
|
247 | 247 | def _handle_err(self): |
|
248 | 248 | # We don't want to let this go silently, so eventually we should log. |
|
249 | 249 | raise zmq.ZMQError() |
|
250 | 250 | |
|
251 | 251 | def _queue_request(self, msg): |
|
252 | 252 | self.command_queue.put(msg) |
|
253 | 253 | self.add_io_state(POLLOUT) |
|
254 | 254 | |
|
255 | 255 | |
|
256 | 256 | class SubSocketChannel(ZmqSocketChannel): |
|
257 | 257 | """The SUB channel which listens for messages that the kernel publishes. |
|
258 | 258 | """ |
|
259 | 259 | |
|
260 | 260 | def __init__(self, context, session, address): |
|
261 | 261 | super(SubSocketChannel, self).__init__(context, session, address) |
|
262 | 262 | |
|
263 | 263 | def run(self): |
|
264 | 264 | """The thread's main activity. Call start() instead.""" |
|
265 | 265 | self.socket = self.context.socket(zmq.SUB) |
|
266 | 266 | self.socket.setsockopt(zmq.SUBSCRIBE,'') |
|
267 | 267 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
268 | 268 | self.socket.connect('tcp://%s:%i' % self.address) |
|
269 | 269 | self.ioloop = ioloop.IOLoop() |
|
270 | 270 | self.iostate = POLLIN|POLLERR |
|
271 | 271 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
272 | 272 | self.iostate) |
|
273 | 273 | self.ioloop.start() |
|
274 | 274 | |
|
275 | 275 | def stop(self): |
|
276 | 276 | self.ioloop.stop() |
|
277 | 277 | super(SubSocketChannel, self).stop() |
|
278 | 278 | |
|
279 | 279 | def call_handlers(self, msg): |
|
280 | 280 | """This method is called in the ioloop thread when a message arrives. |
|
281 | 281 | |
|
282 | 282 | Subclasses should override this method to handle incoming messages. |
|
283 | 283 | It is important to remember that this method is called in the thread |
|
284 | 284 | so that some logic must be done to ensure that the application leve |
|
285 | 285 | handlers are called in the application thread. |
|
286 | 286 | """ |
|
287 | 287 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
288 | 288 | |
|
289 | 289 | def flush(self, timeout=1.0): |
|
290 | 290 | """Immediately processes all pending messages on the SUB channel. |
|
291 | 291 | |
|
292 | 292 | Callers should use this method to ensure that :method:`call_handlers` |
|
293 | 293 | has been called for all messages that have been received on the |
|
294 | 294 | 0MQ SUB socket of this channel. |
|
295 | 295 | |
|
296 | 296 | This method is thread safe. |
|
297 | 297 | |
|
298 | 298 | Parameters |
|
299 | 299 | ---------- |
|
300 | 300 | timeout : float, optional |
|
301 | 301 | The maximum amount of time to spend flushing, in seconds. The |
|
302 | 302 | default is one second. |
|
303 | 303 | """ |
|
304 | 304 | # We do the IOLoop callback process twice to ensure that the IOLoop |
|
305 | 305 | # gets to perform at least one full poll. |
|
306 | 306 | stop_time = time.time() + timeout |
|
307 | 307 | for i in xrange(2): |
|
308 | 308 | self._flushed = False |
|
309 | 309 | self.ioloop.add_callback(self._flush) |
|
310 | 310 | while not self._flushed and time.time() < stop_time: |
|
311 | 311 | time.sleep(0.01) |
|
312 | 312 | |
|
313 | 313 | def _handle_events(self, socket, events): |
|
314 | 314 | # Turn on and off POLLOUT depending on if we have made a request |
|
315 | 315 | if events & POLLERR: |
|
316 | 316 | self._handle_err() |
|
317 | 317 | if events & POLLIN: |
|
318 | 318 | self._handle_recv() |
|
319 | 319 | |
|
320 | 320 | def _handle_err(self): |
|
321 | 321 | # We don't want to let this go silently, so eventually we should log. |
|
322 | 322 | raise zmq.ZMQError() |
|
323 | 323 | |
|
324 | 324 | def _handle_recv(self): |
|
325 | 325 | # Get all of the messages we can |
|
326 | 326 | while True: |
|
327 | 327 | try: |
|
328 | 328 | msg = self.socket.recv_json(zmq.NOBLOCK) |
|
329 | 329 | except zmq.ZMQError: |
|
330 | 330 | # Check the errno? |
|
331 | 331 | # Will this trigger POLLERR? |
|
332 | 332 | break |
|
333 | 333 | else: |
|
334 | 334 | self.call_handlers(msg) |
|
335 | 335 | |
|
336 | 336 | def _flush(self): |
|
337 | 337 | """Callback for :method:`self.flush`.""" |
|
338 | 338 | self._flushed = True |
|
339 | 339 | |
|
340 | 340 | |
|
341 | 341 | class RepSocketChannel(ZmqSocketChannel): |
|
342 | 342 | """A reply channel to handle raw_input requests that the kernel makes.""" |
|
343 | 343 | |
|
344 | 344 | msg_queue = None |
|
345 | 345 | |
|
346 | 346 | def __init__(self, context, session, address): |
|
347 | 347 | self.msg_queue = Queue() |
|
348 | 348 | super(RepSocketChannel, self).__init__(context, session, address) |
|
349 | 349 | |
|
350 | 350 | def run(self): |
|
351 | 351 | """The thread's main activity. Call start() instead.""" |
|
352 | 352 | self.socket = self.context.socket(zmq.XREQ) |
|
353 | 353 | self.socket.setsockopt(zmq.IDENTITY, self.session.session) |
|
354 | 354 | self.socket.connect('tcp://%s:%i' % self.address) |
|
355 | 355 | self.ioloop = ioloop.IOLoop() |
|
356 | 356 | self.iostate = POLLERR|POLLIN |
|
357 | 357 | self.ioloop.add_handler(self.socket, self._handle_events, |
|
358 | 358 | self.iostate) |
|
359 | 359 | self.ioloop.start() |
|
360 | 360 | |
|
361 | 361 | def stop(self): |
|
362 | 362 | self.ioloop.stop() |
|
363 | 363 | super(RepSocketChannel, self).stop() |
|
364 | 364 | |
|
365 | 365 | def call_handlers(self, msg): |
|
366 | 366 | """This method is called in the ioloop thread when a message arrives. |
|
367 | 367 | |
|
368 | 368 | Subclasses should override this method to handle incoming messages. |
|
369 | 369 | It is important to remember that this method is called in the thread |
|
370 | 370 | so that some logic must be done to ensure that the application leve |
|
371 | 371 | handlers are called in the application thread. |
|
372 | 372 | """ |
|
373 | 373 | raise NotImplementedError('call_handlers must be defined in a subclass.') |
|
374 | 374 | |
|
375 | 375 | def input(self, string): |
|
376 | 376 | """Send a string of raw input to the kernel.""" |
|
377 | 377 | content = dict(value=string) |
|
378 | 378 | msg = self.session.msg('input_reply', content) |
|
379 | 379 | self._queue_reply(msg) |
|
380 | 380 | |
|
381 | 381 | def _handle_events(self, socket, events): |
|
382 | 382 | if events & POLLERR: |
|
383 | 383 | self._handle_err() |
|
384 | 384 | if events & POLLOUT: |
|
385 | 385 | self._handle_send() |
|
386 | 386 | if events & POLLIN: |
|
387 | 387 | self._handle_recv() |
|
388 | 388 | |
|
389 | 389 | def _handle_recv(self): |
|
390 | 390 | msg = self.socket.recv_json() |
|
391 | 391 | self.call_handlers(msg) |
|
392 | 392 | |
|
393 | 393 | def _handle_send(self): |
|
394 | 394 | try: |
|
395 | 395 | msg = self.msg_queue.get(False) |
|
396 | 396 | except Empty: |
|
397 | 397 | pass |
|
398 | 398 | else: |
|
399 | 399 | self.socket.send_json(msg) |
|
400 | 400 | if self.msg_queue.empty(): |
|
401 | 401 | self.drop_io_state(POLLOUT) |
|
402 | 402 | |
|
403 | 403 | def _handle_err(self): |
|
404 | 404 | # We don't want to let this go silently, so eventually we should log. |
|
405 | 405 | raise zmq.ZMQError() |
|
406 | 406 | |
|
407 | 407 | def _queue_reply(self, msg): |
|
408 | 408 | self.msg_queue.put(msg) |
|
409 | 409 | self.add_io_state(POLLOUT) |
|
410 | 410 | |
|
411 | 411 | |
|
412 | 412 | #----------------------------------------------------------------------------- |
|
413 | 413 | # Main kernel manager class |
|
414 | 414 | #----------------------------------------------------------------------------- |
|
415 | 415 | |
|
416 | 416 | class KernelManager(HasTraits): |
|
417 | 417 | """ Manages a kernel for a frontend. |
|
418 | 418 | |
|
419 | 419 | The SUB channel is for the frontend to receive messages published by the |
|
420 | 420 | kernel. |
|
421 | 421 | |
|
422 | 422 | The REQ channel is for the frontend to make requests of the kernel. |
|
423 | 423 | |
|
424 | 424 | The REP channel is for the kernel to request stdin (raw_input) from the |
|
425 | 425 | frontend. |
|
426 | 426 | """ |
|
427 | 427 | # The PyZMQ Context to use for communication with the kernel. |
|
428 | 428 | context = Instance(zmq.Context,(),{}) |
|
429 | 429 | |
|
430 | 430 | # The Session to use for communication with the kernel. |
|
431 | 431 | session = Instance(Session,(),{}) |
|
432 | 432 | |
|
433 | 433 | # The kernel process with which the KernelManager is communicating. |
|
434 | 434 | kernel = Instance(Popen) |
|
435 | 435 | |
|
436 | 436 | # The classes to use for the various channels. |
|
437 | 437 | xreq_channel_class = Type(XReqSocketChannel) |
|
438 | 438 | sub_channel_class = Type(SubSocketChannel) |
|
439 | 439 | rep_channel_class = Type(RepSocketChannel) |
|
440 | 440 | |
|
441 | 441 | # Protected traits. |
|
442 | 442 | xreq_address = TCPAddress((LOCALHOST, 0)) |
|
443 | 443 | sub_address = TCPAddress((LOCALHOST, 0)) |
|
444 | 444 | rep_address = TCPAddress((LOCALHOST, 0)) |
|
445 | 445 | _xreq_channel = Any |
|
446 | 446 | _sub_channel = Any |
|
447 | 447 | _rep_channel = Any |
|
448 | 448 | |
|
449 | 449 | def __init__(self, **kwargs): |
|
450 | 450 | super(KernelManager, self).__init__(**kwargs) |
|
451 | 451 | |
|
452 | 452 | #--------------------------------- ----------------------------------------- |
|
453 | 453 | # Channel management methods: |
|
454 | 454 | #-------------------------------------------------------------------------- |
|
455 | 455 | |
|
456 | 456 | def start_channels(self): |
|
457 | 457 | """Starts the channels for this kernel. |
|
458 | 458 | |
|
459 | 459 | This will create the channels if they do not exist and then start |
|
460 | 460 | them. If port numbers of 0 are being used (random ports) then you |
|
461 | 461 | must first call :method:`start_kernel`. If the channels have been |
|
462 | 462 | stopped and you call this, :class:`RuntimeError` will be raised. |
|
463 | 463 | """ |
|
464 | 464 | self.xreq_channel.start() |
|
465 | 465 | self.sub_channel.start() |
|
466 | 466 | self.rep_channel.start() |
|
467 | 467 | |
|
468 | 468 | def stop_channels(self): |
|
469 | 469 | """Stops the channels for this kernel. |
|
470 | 470 | |
|
471 | 471 | This stops the channels by joining their threads. If the channels |
|
472 | 472 | were not started, :class:`RuntimeError` will be raised. |
|
473 | 473 | """ |
|
474 | 474 | self.xreq_channel.stop() |
|
475 | 475 | self.sub_channel.stop() |
|
476 | 476 | self.rep_channel.stop() |
|
477 | 477 | |
|
478 | 478 | @property |
|
479 | 479 | def channels_running(self): |
|
480 | 480 | """Are all of the channels created and running?""" |
|
481 | 481 | return self.xreq_channel.is_alive() \ |
|
482 | 482 | and self.sub_channel.is_alive() \ |
|
483 | 483 | and self.rep_channel.is_alive() |
|
484 | 484 | |
|
485 | 485 | #-------------------------------------------------------------------------- |
|
486 | 486 | # Kernel process management methods: |
|
487 | 487 | #-------------------------------------------------------------------------- |
|
488 | 488 | |
|
489 | 489 | def start_kernel(self): |
|
490 | 490 | """Starts a kernel process and configures the manager to use it. |
|
491 | 491 | |
|
492 | 492 | If random ports (port=0) are being used, this method must be called |
|
493 | 493 | before the channels are created. |
|
494 | 494 | """ |
|
495 | 495 | xreq, sub, rep = self.xreq_address, self.sub_address, self.rep_address |
|
496 | 496 | if xreq[0] != LOCALHOST or sub[0] != LOCALHOST or rep[0] != LOCALHOST: |
|
497 | 497 | raise RuntimeError("Can only launch a kernel on localhost." |
|
498 | 498 | "Make sure that the '*_address' attributes are " |
|
499 | 499 | "configured properly.") |
|
500 | 500 | |
|
501 | 501 | self.kernel, xrep, pub, req = launch_kernel( |
|
502 | 502 | xrep_port=xreq[1], pub_port=sub[1], req_port=rep[1]) |
|
503 | 503 | self.xreq_address = (LOCALHOST, xrep) |
|
504 | 504 | self.sub_address = (LOCALHOST, pub) |
|
505 | 505 | self.rep_address = (LOCALHOST, req) |
|
506 | 506 | |
|
507 | 507 | @property |
|
508 | 508 | def has_kernel(self): |
|
509 | 509 | """Returns whether a kernel process has been specified for the kernel |
|
510 | 510 | manager. |
|
511 | 511 | """ |
|
512 | 512 | return self.kernel is not None |
|
513 | 513 | |
|
514 | 514 | def kill_kernel(self): |
|
515 | 515 | """ Kill the running kernel. """ |
|
516 | 516 | if self.kernel is not None: |
|
517 | 517 | self.kernel.kill() |
|
518 | 518 | self.kernel = None |
|
519 | 519 | else: |
|
520 | 520 | raise RuntimeError("Cannot kill kernel. No kernel is running!") |
|
521 | 521 | |
|
522 | 522 | def signal_kernel(self, signum): |
|
523 | 523 | """ Sends a signal to the kernel. """ |
|
524 | 524 | if self.kernel is not None: |
|
525 | 525 | self.kernel.send_signal(signum) |
|
526 | 526 | else: |
|
527 | 527 | raise RuntimeError("Cannot signal kernel. No kernel is running!") |
|
528 | 528 | |
|
529 | 529 | @property |
|
530 | 530 | def is_alive(self): |
|
531 | 531 | """Is the kernel process still running?""" |
|
532 | 532 | if self.kernel is not None: |
|
533 | 533 | if self.kernel.poll() is None: |
|
534 | 534 | return True |
|
535 | 535 | else: |
|
536 | 536 | return False |
|
537 | 537 | else: |
|
538 | 538 | # We didn't start the kernel with this KernelManager so we don't |
|
539 | 539 | # know if it is running. We should use a heartbeat for this case. |
|
540 | 540 | return True |
|
541 | 541 | |
|
542 | 542 | #-------------------------------------------------------------------------- |
|
543 | 543 | # Channels used for communication with the kernel: |
|
544 | 544 | #-------------------------------------------------------------------------- |
|
545 | 545 | |
|
546 | 546 | @property |
|
547 | 547 | def xreq_channel(self): |
|
548 | 548 | """Get the REQ socket channel object to make requests of the kernel.""" |
|
549 | 549 | if self._xreq_channel is None: |
|
550 | 550 | self._xreq_channel = self.xreq_channel_class(self.context, |
|
551 | 551 | self.session, |
|
552 | 552 | self.xreq_address) |
|
553 | 553 | return self._xreq_channel |
|
554 | 554 | |
|
555 | 555 | @property |
|
556 | 556 | def sub_channel(self): |
|
557 | 557 | """Get the SUB socket channel object.""" |
|
558 | 558 | if self._sub_channel is None: |
|
559 | 559 | self._sub_channel = self.sub_channel_class(self.context, |
|
560 | 560 | self.session, |
|
561 | 561 | self.sub_address) |
|
562 | 562 | return self._sub_channel |
|
563 | 563 | |
|
564 | 564 | @property |
|
565 | 565 | def rep_channel(self): |
|
566 | 566 | """Get the REP socket channel object to handle stdin (raw_input).""" |
|
567 | 567 | if self._rep_channel is None: |
|
568 | 568 | self._rep_channel = self.rep_channel_class(self.context, |
|
569 | 569 | self.session, |
|
570 | 570 | self.rep_address) |
|
571 | 571 | return self._rep_channel |
General Comments 0
You need to be logged in to leave comments.
Login now