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"""Tornado handlers for kernels."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import json
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import logging
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from tornado import gen, web
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from tornado.concurrent import Future
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from tornado.ioloop import IOLoop
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from IPython.utils.jsonutil import date_default
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from IPython.utils.py3compat import cast_unicode
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from IPython.html.utils import url_path_join, url_escape
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from ...base.handlers import IPythonHandler, json_errors
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from ...base.zmqhandlers import AuthenticatedZMQStreamHandler, deserialize_binary_message
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from IPython.core.release import kernel_protocol_version
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class MainKernelHandler(IPythonHandler):
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@web.authenticated
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@json_errors
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def get(self):
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km = self.kernel_manager
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self.finish(json.dumps(km.list_kernels()))
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@web.authenticated
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@json_errors
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def post(self):
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km = self.kernel_manager
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model = self.get_json_body()
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if model is None:
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model = {
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'name': km.default_kernel_name
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}
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else:
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model.setdefault('name', km.default_kernel_name)
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kernel_id = km.start_kernel(kernel_name=model['name'])
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model = km.kernel_model(kernel_id)
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location = url_path_join(self.base_url, 'api', 'kernels', kernel_id)
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self.set_header('Location', url_escape(location))
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self.set_status(201)
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self.finish(json.dumps(model))
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class KernelHandler(IPythonHandler):
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SUPPORTED_METHODS = ('DELETE', 'GET')
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@web.authenticated
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@json_errors
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def get(self, kernel_id):
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km = self.kernel_manager
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km._check_kernel_id(kernel_id)
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model = km.kernel_model(kernel_id)
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self.finish(json.dumps(model))
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@web.authenticated
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@json_errors
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def delete(self, kernel_id):
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km = self.kernel_manager
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km.shutdown_kernel(kernel_id)
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self.set_status(204)
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self.finish()
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class KernelActionHandler(IPythonHandler):
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@web.authenticated
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@json_errors
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def post(self, kernel_id, action):
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km = self.kernel_manager
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if action == 'interrupt':
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km.interrupt_kernel(kernel_id)
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self.set_status(204)
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if action == 'restart':
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km.restart_kernel(kernel_id)
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model = km.kernel_model(kernel_id)
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self.set_header('Location', '{0}api/kernels/{1}'.format(self.base_url, kernel_id))
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self.write(json.dumps(model))
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self.finish()
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class ZMQChannelHandler(AuthenticatedZMQStreamHandler):
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@property
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def kernel_info_timeout(self):
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return self.settings.get('kernel_info_timeout', 10)
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, getattr(self, 'kernel_id', 'uninitialized'))
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def create_stream(self):
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km = self.kernel_manager
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meth = getattr(km, 'connect_%s' % self.channel)
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self.zmq_stream = meth(self.kernel_id, identity=self.session.bsession)
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def request_kernel_info(self):
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"""send a request for kernel_info"""
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km = self.kernel_manager
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kernel = km.get_kernel(self.kernel_id)
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try:
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# check for previous request
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future = kernel._kernel_info_future
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except AttributeError:
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self.log.debug("Requesting kernel info from %s", self.kernel_id)
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# Create a kernel_info channel to query the kernel protocol version.
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# This channel will be closed after the kernel_info reply is received.
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if self.kernel_info_channel is None:
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self.kernel_info_channel = km.connect_shell(self.kernel_id)
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self.kernel_info_channel.on_recv(self._handle_kernel_info_reply)
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self.session.send(self.kernel_info_channel, "kernel_info_request")
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# store the future on the kernel, so only one request is sent
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kernel._kernel_info_future = self._kernel_info_future
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else:
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if not future.done():
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self.log.debug("Waiting for pending kernel_info request")
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future.add_done_callback(lambda f: self._finish_kernel_info(f.result()))
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return self._kernel_info_future
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def _handle_kernel_info_reply(self, msg):
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"""process the kernel_info_reply
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enabling msg spec adaptation, if necessary
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"""
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idents,msg = self.session.feed_identities(msg)
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try:
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msg = self.session.deserialize(msg)
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except:
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self.log.error("Bad kernel_info reply", exc_info=True)
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self._kernel_info_future.set_result({})
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return
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else:
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info = msg['content']
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self.log.debug("Received kernel info: %s", info)
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if msg['msg_type'] != 'kernel_info_reply' or 'protocol_version' not in info:
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self.log.error("Kernel info request failed, assuming current %s", info)
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info = {}
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self._finish_kernel_info(info)
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# close the kernel_info channel, we don't need it anymore
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if self.kernel_info_channel:
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self.kernel_info_channel.close()
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self.kernel_info_channel = None
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def _finish_kernel_info(self, info):
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"""Finish handling kernel_info reply
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Set up protocol adaptation, if needed,
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and signal that connection can continue.
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"""
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protocol_version = info.get('protocol_version', kernel_protocol_version)
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if protocol_version != kernel_protocol_version:
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self.session.adapt_version = int(protocol_version.split('.')[0])
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self.log.info("Kernel %s speaks protocol %s", self.kernel_id, protocol_version)
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if not self._kernel_info_future.done():
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self._kernel_info_future.set_result(info)
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def initialize(self):
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super(ZMQChannelHandler, self).initialize()
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self.zmq_stream = None
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self.kernel_id = None
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self.kernel_info_channel = None
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self._kernel_info_future = Future()
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@gen.coroutine
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def pre_get(self):
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# authenticate first
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super(ZMQChannelHandler, self).pre_get()
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# then request kernel info, waiting up to a certain time before giving up.
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# We don't want to wait forever, because browsers don't take it well when
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# servers never respond to websocket connection requests.
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future = self.request_kernel_info()
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def give_up():
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"""Don't wait forever for the kernel to reply"""
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if future.done():
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return
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self.log.warn("Timeout waiting for kernel_info reply from %s", self.kernel_id)
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future.set_result({})
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loop = IOLoop.current()
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loop.add_timeout(loop.time() + self.kernel_info_timeout, give_up)
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# actually wait for it
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yield future
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@gen.coroutine
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def get(self, kernel_id):
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self.kernel_id = cast_unicode(kernel_id, 'ascii')
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yield super(ZMQChannelHandler, self).get(kernel_id=kernel_id)
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def open(self, kernel_id):
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super(ZMQChannelHandler, self).open()
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try:
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self.create_stream()
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except web.HTTPError as e:
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self.log.error("Error opening stream: %s", e)
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# WebSockets don't response to traditional error codes so we
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# close the connection.
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if not self.stream.closed():
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self.stream.close()
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self.close()
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else:
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self.zmq_stream.on_recv(self._on_zmq_reply)
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def on_message(self, msg):
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if self.zmq_stream is None:
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return
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elif self.zmq_stream.closed():
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self.log.info("%s closed, closing websocket.", self)
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self.close()
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return
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if isinstance(msg, bytes):
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msg = deserialize_binary_message(msg)
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else:
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msg = json.loads(msg)
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self.session.send(self.zmq_stream, msg)
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def on_close(self):
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# This method can be called twice, once by self.kernel_died and once
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# from the WebSocket close event. If the WebSocket connection is
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# closed before the ZMQ streams are setup, they could be None.
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if self.zmq_stream is not None and not self.zmq_stream.closed():
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self.zmq_stream.on_recv(None)
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# close the socket directly, don't wait for the stream
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socket = self.zmq_stream.socket
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self.zmq_stream.close()
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socket.close()
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class IOPubHandler(ZMQChannelHandler):
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channel = 'iopub'
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def create_stream(self):
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super(IOPubHandler, self).create_stream()
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km = self.kernel_manager
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km.add_restart_callback(self.kernel_id, self.on_kernel_restarted)
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km.add_restart_callback(self.kernel_id, self.on_restart_failed, 'dead')
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def on_close(self):
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km = self.kernel_manager
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if self.kernel_id in km:
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km.remove_restart_callback(
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self.kernel_id, self.on_kernel_restarted,
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)
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km.remove_restart_callback(
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self.kernel_id, self.on_restart_failed, 'dead',
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)
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super(IOPubHandler, self).on_close()
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def _send_status_message(self, status):
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msg = self.session.msg("status",
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{'execution_state': status}
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)
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self.write_message(json.dumps(msg, default=date_default))
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def on_kernel_restarted(self):
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logging.warn("kernel %s restarted", self.kernel_id)
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self._send_status_message('restarting')
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def on_restart_failed(self):
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logging.error("kernel %s restarted failed!", self.kernel_id)
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self._send_status_message('dead')
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def on_message(self, msg):
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"""IOPub messages make no sense"""
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pass
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class ShellHandler(ZMQChannelHandler):
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channel = 'shell'
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class StdinHandler(ZMQChannelHandler):
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channel = 'stdin'
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#-----------------------------------------------------------------------------
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# URL to handler mappings
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#-----------------------------------------------------------------------------
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_kernel_id_regex = r"(?P<kernel_id>\w+-\w+-\w+-\w+-\w+)"
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_kernel_action_regex = r"(?P<action>restart|interrupt)"
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default_handlers = [
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(r"/api/kernels", MainKernelHandler),
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(r"/api/kernels/%s" % _kernel_id_regex, KernelHandler),
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(r"/api/kernels/%s/%s" % (_kernel_id_regex, _kernel_action_regex), KernelActionHandler),
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(r"/api/kernels/%s/iopub" % _kernel_id_regex, IOPubHandler),
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(r"/api/kernels/%s/shell" % _kernel_id_regex, ShellHandler),
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(r"/api/kernels/%s/stdin" % _kernel_id_regex, StdinHandler)
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]
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