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""" Defines a KernelClient that provides signals and slots.
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"""
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import atexit
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import errno
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from threading import Thread
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import time
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import zmq
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# import ZMQError in top-level namespace, to avoid ugly attribute-error messages
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# during garbage collection of threads at exit:
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from zmq import ZMQError
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from zmq.eventloop import ioloop, zmqstream
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from IPython.external.qt import QtCore
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# Local imports
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from IPython.utils.traitlets import Type
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from IPython.kernel.channels import HBChannel,\
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make_shell_socket, make_iopub_socket, make_stdin_socket
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from IPython.kernel import KernelClient
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from .kernel_mixins import (QtHBChannelMixin, QtKernelClientMixin)
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from .util import SuperQObject
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class QtHBChannel(QtHBChannelMixin, HBChannel):
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pass
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from IPython.core.release import kernel_protocol_version_info
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from IPython.kernel.channelsabc import (
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ShellChannelABC, IOPubChannelABC, StdInChannelABC,
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)
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from IPython.utils.py3compat import string_types, iteritems
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major_protocol_version = kernel_protocol_version_info[0]
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class InvalidPortNumber(Exception):
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pass
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# some utilities to validate message structure, these might get moved elsewhere
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# if they prove to have more generic utility
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def validate_string_dict(dct):
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"""Validate that the input is a dict with string keys and values.
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Raises ValueError if not."""
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for k,v in iteritems(dct):
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if not isinstance(k, string_types):
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raise ValueError('key %r in dict must be a string' % k)
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if not isinstance(v, string_types):
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raise ValueError('value %r in dict must be a string' % v)
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class QtZMQSocketChannel(SuperQObject, Thread):
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"""The base class for the channels that use ZMQ sockets."""
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session = None
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socket = None
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ioloop = None
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stream = None
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_exiting = False
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proxy_methods = []
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# Emitted when the channel is started.
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started = QtCore.Signal()
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# Emitted when the channel is stopped.
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stopped = QtCore.Signal()
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message_received = QtCore.Signal(object)
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#---------------------------------------------------------------------------
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# InProcessChannel interface
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#---------------------------------------------------------------------------
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def call_handlers_later(self, *args, **kwds):
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""" Call the message handlers later.
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"""
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do_later = lambda: self.call_handlers(*args, **kwds)
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QtCore.QTimer.singleShot(0, do_later)
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def process_events(self):
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""" Process any pending GUI events.
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"""
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QtCore.QCoreApplication.instance().processEvents()
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def __init__(self, socket, session):
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"""Create a channel.
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Parameters
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----------
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context : :class:`zmq.Context`
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The ZMQ context to use.
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session : :class:`session.Session`
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The session to use.
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address : zmq url
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Standard (ip, port) tuple that the kernel is listening on.
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"""
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super(QtZMQSocketChannel, self).__init__()
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self.daemon = True
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self.socket = socket
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self.session = session
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atexit.register(self._notice_exit)
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def _notice_exit(self):
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self._exiting = True
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def _run_loop(self):
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"""Run my loop, ignoring EINTR events in the poller"""
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while True:
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try:
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self.ioloop.start()
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except ZMQError as e:
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if e.errno == errno.EINTR:
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continue
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else:
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raise
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except Exception:
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if self._exiting:
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break
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else:
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raise
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else:
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break
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def start(self):
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""" Reimplemented to emit signal.
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"""
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super(QtZMQSocketChannel, self).start()
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self.started.emit()
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def stop(self):
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"""Stop the channel's event loop and join its thread.
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This calls :meth:`~threading.Thread.join` and returns when the thread
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terminates. :class:`RuntimeError` will be raised if
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:meth:`~threading.Thread.start` is called again.
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"""
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if self.ioloop is not None:
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self.ioloop.stop()
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self.join()
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self.close()
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self.stopped.emit()
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def close(self):
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if self.ioloop is not None:
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try:
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self.ioloop.close(all_fds=True)
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except Exception:
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pass
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if self.socket is not None:
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try:
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self.socket.close(linger=0)
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except Exception:
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pass
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self.socket = None
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@property
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def address(self):
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"""Get the channel's address as a zmq url string.
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These URLS have the form: 'tcp://127.0.0.1:5555'.
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"""
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return self._address
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def _queue_send(self, msg):
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"""Queue a message to be sent from the IOLoop's thread.
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Parameters
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----------
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msg : message to send
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This is threadsafe, as it uses IOLoop.add_callback to give the loop's
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thread control of the action.
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"""
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def thread_send():
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self.session.send(self.stream, msg)
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self.ioloop.add_callback(thread_send)
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def _handle_recv(self, msg):
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"""Callback for stream.on_recv.
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Unpacks message, and calls handlers with it.
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"""
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ident,smsg = self.session.feed_identities(msg)
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msg = self.session.deserialize(smsg)
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self.call_handlers(msg)
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def call_handlers(self, msg):
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"""This method is called in the ioloop thread when a message arrives.
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Subclasses should override this method to handle incoming messages.
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It is important to remember that this method is called in the thread
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so that some logic must be done to ensure that the application level
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handlers are called in the application thread.
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"""
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# Emit the generic signal.
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self.message_received.emit(msg)
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class QtShellChannel(QtZMQSocketChannel):
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"""The shell channel for issuing request/replies to the kernel."""
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# Emitted when a reply has been received for the corresponding request type.
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execute_reply = QtCore.Signal(object)
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complete_reply = QtCore.Signal(object)
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inspect_reply = QtCore.Signal(object)
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history_reply = QtCore.Signal(object)
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kernel_info_reply = QtCore.Signal(object)
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def __init__(self, socket, session):
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super(QtShellChannel, self).__init__(socket, session)
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self.ioloop = ioloop.IOLoop()
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def run(self):
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"""The thread's main activity. Call start() instead."""
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self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
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self.stream.on_recv(self._handle_recv)
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self._run_loop()
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def call_handlers(self, msg):
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super(QtShellChannel, self).call_handlers(msg)
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# Catch kernel_info_reply for message spec adaptation
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msg_type = msg['header']['msg_type']
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if msg_type == 'kernel_info_reply':
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self._handle_kernel_info_reply(msg)
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# Emit specific signals
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signal = getattr(self, msg_type, None)
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if signal:
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signal.emit(msg)
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def _handle_kernel_info_reply(self, msg):
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"""handle kernel info reply
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sets protocol adaptation version
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"""
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adapt_version = int(msg['content']['protocol_version'].split('.')[0])
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if adapt_version != major_protocol_version:
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self.session.adapt_version = adapt_version
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class QtIOPubChannel(QtZMQSocketChannel):
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"""The iopub channel which listens for messages that the kernel publishes.
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This channel is where all output is published to frontends.
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"""
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# Emitted when a message of type 'stream' is received.
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stream_received = QtCore.Signal(object)
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# Emitted when a message of type 'execute_input' is received.
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execute_input_received = QtCore.Signal(object)
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# Emitted when a message of type 'execute_result' is received.
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execute_result_received = QtCore.Signal(object)
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# Emitted when a message of type 'error' is received.
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error_received = QtCore.Signal(object)
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# Emitted when a message of type 'display_data' is received
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display_data_received = QtCore.Signal(object)
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# Emitted when a crash report message is received from the kernel's
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# last-resort sys.excepthook.
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crash_received = QtCore.Signal(object)
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# Emitted when a shutdown is noticed.
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shutdown_reply_received = QtCore.Signal(object)
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def __init__(self, socket, session):
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super(QtIOPubChannel, self).__init__(socket, session)
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self.ioloop = ioloop.IOLoop()
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def run(self):
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"""The thread's main activity. Call start() instead."""
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self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
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self.stream.on_recv(self._handle_recv)
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self._run_loop()
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def call_handlers(self, msg):
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super(QtIOPubChannel, self).call_handlers(msg)
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# Emit signals for specialized message types.
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msg_type = msg['header']['msg_type']
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signal = getattr(self, msg_type + '_received', None)
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if signal:
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signal.emit(msg)
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def flush(self, timeout=1.0):
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"""Immediately processes all pending messages on the iopub channel.
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Callers should use this method to ensure that :meth:`call_handlers`
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has been called for all messages that have been received on the
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0MQ SUB socket of this channel.
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This method is thread safe.
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Parameters
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----------
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timeout : float, optional
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The maximum amount of time to spend flushing, in seconds. The
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default is one second.
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"""
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# We do the IOLoop callback process twice to ensure that the IOLoop
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# gets to perform at least one full poll.
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stop_time = time.time() + timeout
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for i in range(2):
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self._flushed = False
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self.ioloop.add_callback(self._flush)
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while not self._flushed and time.time() < stop_time:
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time.sleep(0.01)
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def _flush(self):
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"""Callback for :method:`self.flush`."""
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self.stream.flush()
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self._flushed = True
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class QtStdInChannel(QtZMQSocketChannel):
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"""The stdin channel to handle raw_input requests that the kernel makes."""
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msg_queue = None
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proxy_methods = ['input']
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# Emitted when an input request is received.
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input_requested = QtCore.Signal(object)
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def __init__(self, socket, session):
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super(QtStdInChannel, self).__init__(socket, session)
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self.ioloop = ioloop.IOLoop()
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def run(self):
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"""The thread's main activity. Call start() instead."""
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self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
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self.stream.on_recv(self._handle_recv)
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self._run_loop()
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def call_handlers(self, msg):
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super(QtStdInChannel, self).call_handlers(msg)
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# Emit signals for specialized message types.
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msg_type = msg['header']['msg_type']
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if msg_type == 'input_request':
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self.input_requested.emit(msg)
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ShellChannelABC.register(QtShellChannel)
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IOPubChannelABC.register(QtIOPubChannel)
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StdInChannelABC.register(QtStdInChannel)
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class QtKernelClient(QtKernelClientMixin, KernelClient):
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""" A KernelClient that provides signals and slots.
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"""
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def start_channels(self, shell=True, iopub=True, stdin=True, hb=True):
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if shell:
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self.shell_channel.kernel_info_reply.connect(self._handle_kernel_info_reply)
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super(QtKernelClient, self).start_channels(shell, iopub, stdin, hb)
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def _handle_kernel_info_reply(self, msg):
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super(QtKernelClient, self)._handle_kernel_info_reply(msg)
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self.shell_channel.kernel_info_reply.disconnect(self._handle_kernel_info_reply)
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iopub_channel_class = Type(QtIOPubChannel)
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shell_channel_class = Type(QtShellChannel)
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stdin_channel_class = Type(QtStdInChannel)
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hb_channel_class = Type(QtHBChannel)
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