Merge pull request #7108 from takluyver/digging-channels

Refactor kernel channel classes

IPython/kernel/blocking/channels.py

@@ -2,46 +2,59 b''
 
 Useful for test suites and blocking terminal interfaces.
 """
-#-----------------------------------------------------------------------------
-#  Copyright (C) 2013 The IPython Development Team
-#
-#  Distributed under the terms of the BSD License.  The full license is in
-#  the file COPYING.txt, distributed as part of this software.
-#-----------------------------------------------------------------------------
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
 
 try:
     from queue import Queue, Empty  # Py 3
 except ImportError:
     from Queue import Queue, Empty  # Py 2
 
-from IPython.kernel.channels import IOPubChannel, HBChannel, \
-    ShellChannel, StdInChannel
 
-#-----------------------------------------------------------------------------
-# Blocking kernel manager
-#-----------------------------------------------------------------------------
-
-
-class BlockingChannelMixin(object):
-
-    def __init__(self, *args, **kwds):
-        super(BlockingChannelMixin, self).__init__(*args, **kwds)
-        self._in_queue = Queue()
-
-    def call_handlers(self, msg):
-        self._in_queue.put(msg)
+class ZMQSocketChannel(object):
+    """A ZMQ socket in a simple blocking API"""
+    session = None
+    socket = None
+    stream = None
+    _exiting = False
+    proxy_methods = []
+
+    def __init__(self, socket, session, loop=None):
+        """Create a channel.
+
+        Parameters
+        ----------
+        socket : :class:`zmq.Socket`
+            The ZMQ socket to use.
+        session : :class:`session.Session`
+            The session to use.
+        loop
+            Unused here, for other implementations
+        """
+        super(ZMQSocketChannel, self).__init__()
+
+        self.socket = socket
+        self.session = session
+
+    def _recv(self, **kwargs):
+        msg = self.socket.recv_multipart(**kwargs)
+        ident,smsg = self.session.feed_identities(msg)
+        return self.session.deserialize(smsg)
 
     def get_msg(self, block=True, timeout=None):
         """ Gets a message if there is one that is ready. """
-        if timeout is None:
-            # Queue.get(timeout=None) has stupid uninteruptible
-            # behavior, so wait for a week instead
-            timeout = 604800
-        return self._in_queue.get(block, timeout)
+        if block:
+            if timeout is not None:
+                timeout *= 1000  # seconds to ms
+            ready = self.socket.poll(timeout)
+        else:
+            ready = self.socket.poll(timeout=0)
+
+        if ready:
+            return self._recv()
+        else:
+            raise Empty
 
     def get_msgs(self):
         """ Get all messages that are currently ready. """
@@ -55,31 +68,25 b' class BlockingChannelMixin(object):'
 
     def msg_ready(self):
         """ Is there a message that has been received? """
-        return not self._in_queue.empty()
-
-
-class BlockingIOPubChannel(BlockingChannelMixin, IOPubChannel):
-    pass
-
-
-class BlockingShellChannel(BlockingChannelMixin, ShellChannel):
-    def call_handlers(self, msg):
-        if msg['msg_type'] == 'kernel_info_reply':
-            self._handle_kernel_info_reply(msg)
-        return super(BlockingShellChannel, self).call_handlers(msg)
-
-
-class BlockingStdInChannel(BlockingChannelMixin, StdInChannel):
-    pass
+        return bool(self.socket.poll(timeout=0))
 
+    def close(self):
+        if self.socket is not None:
+            try:
+                self.socket.close(linger=0)
+            except Exception:
+                pass
+            self.socket = None
+    stop =  close
 
-class BlockingHBChannel(HBChannel):
+    def is_alive(self):
+        return (self.socket is not None)
 
-    # This kernel needs quicker monitoring, shorten to 1 sec.
-    # less than 0.5s is unreliable, and will get occasional
-    # false reports of missed beats.
-    time_to_dead = 1.
+    def send(self, msg):
+        """Pass a message to the ZMQ socket to send
+        """
+        self.session.send(self.socket, msg)
 
-    def call_handlers(self, since_last_heartbeat):
-        """ Pause beating on missed heartbeat. """
+    def start(self):
         pass
+

IPython/kernel/blocking/client.py

@@ -2,32 +2,38 b''
 
 Useful for test suites and blocking terminal interfaces.
 """
-#-----------------------------------------------------------------------------
-#  Copyright (C) 2013 The IPython Development Team
-#
-#  Distributed under the terms of the BSD License.  The full license is in
-#  the file COPYING.txt, distributed as part of this software.
-#-----------------------------------------------------------------------------
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
+try:
+    from queue import Empty  # Python 3
+except ImportError:
+    from Queue import Empty  # Python 2
 
 from IPython.utils.traitlets import Type
+from IPython.kernel.channels import HBChannel
 from IPython.kernel.client import KernelClient
-from .channels import (
-    BlockingIOPubChannel, BlockingHBChannel,
-    BlockingShellChannel, BlockingStdInChannel
-)
-
-#-----------------------------------------------------------------------------
-# Blocking kernel manager
-#-----------------------------------------------------------------------------
+from .channels import ZMQSocketChannel
 
 class BlockingKernelClient(KernelClient):
+    def wait_for_ready(self):
+        # Wait for kernel info reply on shell channel
+        while True:
+            msg = self.shell_channel.get_msg(block=True)
+            if msg['msg_type'] == 'kernel_info_reply':
+                self._handle_kernel_info_reply(msg)
+                break
+
+        # Flush IOPub channel
+        while True:
+            try:
+                msg = self.iopub_channel.get_msg(block=True, timeout=0.2)
+                print(msg['msg_type'])
+            except Empty:
+                break
 
     # The classes to use for the various channels
-    shell_channel_class = Type(BlockingShellChannel)
-    iopub_channel_class = Type(BlockingIOPubChannel)
-    stdin_channel_class = Type(BlockingStdInChannel)
-    hb_channel_class = Type(BlockingHBChannel)
+    shell_channel_class = Type(ZMQSocketChannel)
+    iopub_channel_class = Type(ZMQSocketChannel)
+    stdin_channel_class = Type(ZMQSocketChannel)
+    hb_channel_class = Type(HBChannel)

IPython/kernel/channels.py

@@ -14,15 +14,10 b' import zmq'
 # import ZMQError in top-level namespace, to avoid ugly attribute-error messages
 # during garbage collection of threads at exit:
 from zmq import ZMQError
-from zmq.eventloop import ioloop, zmqstream
 
 from IPython.core.release import kernel_protocol_version_info
 
-from .channelsabc import (
-    ShellChannelABC, IOPubChannelABC,
-    HBChannelABC, StdInChannelABC,
-)
-from IPython.utils.py3compat import string_types, iteritems
+from .channelsabc import HBChannelABC
 
 #-----------------------------------------------------------------------------
 # Constants and exceptions
@@ -33,52 +28,27 b' major_protocol_version = kernel_protocol_version_info[0]'
 class InvalidPortNumber(Exception):
     pass
 
-#-----------------------------------------------------------------------------
-# Utility functions
-#-----------------------------------------------------------------------------
-
-# some utilities to validate message structure, these might get moved elsewhere
-# if they prove to have more generic utility
-
-def validate_string_list(lst):
-    """Validate that the input is a list of strings.
-
-    Raises ValueError if not."""
-    if not isinstance(lst, list):
-        raise ValueError('input %r must be a list' % lst)
-    for x in lst:
-        if not isinstance(x, string_types):
-            raise ValueError('element %r in list must be a string' % x)
-
-
-def validate_string_dict(dct):
-    """Validate that the input is a dict with string keys and values.
-
-    Raises ValueError if not."""
-    for k,v in iteritems(dct):
-        if not isinstance(k, string_types):
-            raise ValueError('key %r in dict must be a string' % k)
-        if not isinstance(v, string_types):
-            raise ValueError('value %r in dict must be a string' % v)
-
-
-#-----------------------------------------------------------------------------
-# ZMQ Socket Channel classes
-#-----------------------------------------------------------------------------
+class HBChannel(Thread):
+    """The heartbeat channel which monitors the kernel heartbeat.
 
-class ZMQSocketChannel(Thread):
-    """The base class for the channels that use ZMQ sockets."""
+    Note that the heartbeat channel is paused by default. As long as you start
+    this channel, the kernel manager will ensure that it is paused and un-paused
+    as appropriate.
+    """
     context = None
     session = None
     socket = None
-    ioloop = None
-    stream = None
-    _address = None
+    address = None
     _exiting = False
-    proxy_methods = []
+
+    time_to_dead = 1.
+    poller = None
+    _running = None
+    _pause = None
+    _beating = None
 
     def __init__(self, context, session, address):
-        """Create a channel.
+        """Create the heartbeat monitor thread.
 
         Parameters
         ----------
@@ -89,7 +59,7 b' class ZMQSocketChannel(Thread):'
         address : zmq url
             Standard (ip, port) tuple that the kernel is listening on.
         """
-        super(ZMQSocketChannel, self).__init__()
+        super(HBChannel, self).__init__()
         self.daemon = True
 
         self.context = context
@@ -99,429 +69,16 b' class ZMQSocketChannel(Thread):'
                 message = 'The port number for a channel cannot be 0.'
                 raise InvalidPortNumber(message)
             address = "tcp://%s:%i" % address
-        self._address = address
+        self.address = address
         atexit.register(self._notice_exit)
 
-    def _notice_exit(self):
-        self._exiting = True
-
-    def _run_loop(self):
-        """Run my loop, ignoring EINTR events in the poller"""
-        while True:
-            try:
-                self.ioloop.start()
-            except ZMQError as e:
-                if e.errno == errno.EINTR:
-                    continue
-                else:
-                    raise
-            except Exception:
-                if self._exiting:
-                    break
-                else:
-                    raise
-            else:
-                break
-
-    def stop(self):
-        """Stop the channel's event loop and join its thread.
-
-        This calls :meth:`~threading.Thread.join` and returns when the thread
-        terminates. :class:`RuntimeError` will be raised if
-        :meth:`~threading.Thread.start` is called again.
-        """
-        if self.ioloop is not None:
-            self.ioloop.stop()
-        self.join()
-        self.close()
-    
-    def close(self):
-        if self.ioloop is not None:
-            try:
-                self.ioloop.close(all_fds=True)
-            except Exception:
-                pass
-        if self.socket is not None:
-            try:
-                self.socket.close(linger=0)
-            except Exception:
-                pass
-            self.socket = None
-
-    @property
-    def address(self):
-        """Get the channel's address as a zmq url string.
-
-        These URLS have the form: 'tcp://127.0.0.1:5555'.
-        """
-        return self._address
-
-    def _queue_send(self, msg):
-        """Queue a message to be sent from the IOLoop's thread.
-
-        Parameters
-        ----------
-        msg : message to send
-
-        This is threadsafe, as it uses IOLoop.add_callback to give the loop's
-        thread control of the action.
-        """
-        def thread_send():
-            self.session.send(self.stream, msg)
-        self.ioloop.add_callback(thread_send)
-
-    def _handle_recv(self, msg):
-        """Callback for stream.on_recv.
-
-        Unpacks message, and calls handlers with it.
-        """
-        ident,smsg = self.session.feed_identities(msg)
-        msg = self.session.deserialize(smsg)
-        self.call_handlers(msg)
-
-
-
-class ShellChannel(ZMQSocketChannel):
-    """The shell channel for issuing request/replies to the kernel."""
-
-    command_queue = None
-    # flag for whether execute requests should be allowed to call raw_input:
-    allow_stdin = True
-    proxy_methods = [
-        'execute',
-        'complete',
-        'inspect',
-        'history',
-        'kernel_info',
-        'shutdown',
-        'is_complete',
-    ]
-
-    def __init__(self, context, session, address):
-        super(ShellChannel, self).__init__(context, session, address)
-        self.ioloop = ioloop.IOLoop()
-    
-    def run(self):
-        """The thread's main activity.  Call start() instead."""
-        self.socket = self.context.socket(zmq.DEALER)
-        self.socket.linger = 1000
-        self.socket.setsockopt(zmq.IDENTITY, self.session.bsession)
-        self.socket.connect(self.address)
-        self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
-        self.stream.on_recv(self._handle_recv)
-        self._run_loop()
-
-    def call_handlers(self, msg):
-        """This method is called in the ioloop thread when a message arrives.
-
-        Subclasses should override this method to handle incoming messages.
-        It is important to remember that this method is called in the thread
-        so that some logic must be done to ensure that the application level
-        handlers are called in the application thread.
-        """
-        raise NotImplementedError('call_handlers must be defined in a subclass.')
-
-    def execute(self, code, silent=False, store_history=True,
-                user_expressions=None, allow_stdin=None):
-        """Execute code in the kernel.
-
-        Parameters
-        ----------
-        code : str
-            A string of Python code.
-
-        silent : bool, optional (default False)
-            If set, the kernel will execute the code as quietly possible, and
-            will force store_history to be False.
-
-        store_history : bool, optional (default True)
-            If set, the kernel will store command history.  This is forced
-            to be False if silent is True.
-
-        user_expressions : dict, optional
-            A dict mapping names to expressions to be evaluated in the user's
-            dict. The expression values are returned as strings formatted using
-            :func:`repr`.
-
-        allow_stdin : bool, optional (default self.allow_stdin)
-            Flag for whether the kernel can send stdin requests to frontends.
-
-            Some frontends (e.g. the Notebook) do not support stdin requests.
-            If raw_input is called from code executed from such a frontend, a
-            StdinNotImplementedError will be raised.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
-        if user_expressions is None:
-            user_expressions = {}
-        if allow_stdin is None:
-            allow_stdin = self.allow_stdin
-
-
-        # Don't waste network traffic if inputs are invalid
-        if not isinstance(code, string_types):
-            raise ValueError('code %r must be a string' % code)
-        validate_string_dict(user_expressions)
-
-        # Create class for content/msg creation. Related to, but possibly
-        # not in Session.
-        content = dict(code=code, silent=silent, store_history=store_history,
-                       user_expressions=user_expressions,
-                       allow_stdin=allow_stdin,
-                       )
-        msg = self.session.msg('execute_request', content)
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-    def complete(self, code, cursor_pos=None):
-        """Tab complete text in the kernel's namespace.
-
-        Parameters
-        ----------
-        code : str
-            The context in which completion is requested.
-            Can be anything between a variable name and an entire cell.
-        cursor_pos : int, optional
-            The position of the cursor in the block of code where the completion was requested.
-            Default: ``len(code)``
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
-        if cursor_pos is None:
-            cursor_pos = len(code)
-        content = dict(code=code, cursor_pos=cursor_pos)
-        msg = self.session.msg('complete_request', content)
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-    def inspect(self, code, cursor_pos=None, detail_level=0):
-        """Get metadata information about an object in the kernel's namespace.
-
-        It is up to the kernel to determine the appropriate object to inspect.
-
-        Parameters
-        ----------
-        code : str
-            The context in which info is requested.
-            Can be anything between a variable name and an entire cell.
-        cursor_pos : int, optional
-            The position of the cursor in the block of code where the info was requested.
-            Default: ``len(code)``
-        detail_level : int, optional
-            The level of detail for the introspection (0-2)
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
-        if cursor_pos is None:
-            cursor_pos = len(code)
-        content = dict(code=code, cursor_pos=cursor_pos,
-            detail_level=detail_level,
-        )
-        msg = self.session.msg('inspect_request', content)
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-    def history(self, raw=True, output=False, hist_access_type='range', **kwargs):
-        """Get entries from the kernel's history list.
-
-        Parameters
-        ----------
-        raw : bool
-            If True, return the raw input.
-        output : bool
-            If True, then return the output as well.
-        hist_access_type : str
-            'range' (fill in session, start and stop params), 'tail' (fill in n)
-             or 'search' (fill in pattern param).
-
-        session : int
-            For a range request, the session from which to get lines. Session
-            numbers are positive integers; negative ones count back from the
-            current session.
-        start : int
-            The first line number of a history range.
-        stop : int
-            The final (excluded) line number of a history range.
-
-        n : int
-            The number of lines of history to get for a tail request.
-
-        pattern : str
-            The glob-syntax pattern for a search request.
-
-        Returns
-        -------
-        The msg_id of the message sent.
-        """
-        content = dict(raw=raw, output=output, hist_access_type=hist_access_type,
-                                                                    **kwargs)
-        msg = self.session.msg('history_request', content)
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-    def kernel_info(self):
-        """Request kernel info."""
-        msg = self.session.msg('kernel_info_request')
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-    
-    def _handle_kernel_info_reply(self, msg):
-        """handle kernel info reply
-        
-        sets protocol adaptation version
-        """
-        adapt_version = int(msg['content']['protocol_version'].split('.')[0])
-        if adapt_version != major_protocol_version:
-            self.session.adapt_version = adapt_version
-
-    def shutdown(self, restart=False):
-        """Request an immediate kernel shutdown.
-
-        Upon receipt of the (empty) reply, client code can safely assume that
-        the kernel has shut down and it's safe to forcefully terminate it if
-        it's still alive.
-
-        The kernel will send the reply via a function registered with Python's
-        atexit module, ensuring it's truly done as the kernel is done with all
-        normal operation.
-        """
-        # Send quit message to kernel. Once we implement kernel-side setattr,
-        # this should probably be done that way, but for now this will do.
-        msg = self.session.msg('shutdown_request', {'restart':restart})
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-    def is_complete(self, code):
-        msg = self.session.msg('is_complete_request', {'code': code})
-        self._queue_send(msg)
-        return msg['header']['msg_id']
-
-
-class IOPubChannel(ZMQSocketChannel):
-    """The iopub channel which listens for messages that the kernel publishes.
-
-    This channel is where all output is published to frontends.
-    """
-
-    def __init__(self, context, session, address):
-        super(IOPubChannel, self).__init__(context, session, address)
-        self.ioloop = ioloop.IOLoop()
-
-    def run(self):
-        """The thread's main activity.  Call start() instead."""
-        self.socket = self.context.socket(zmq.SUB)
-        self.socket.linger = 1000
-        self.socket.setsockopt(zmq.SUBSCRIBE,b'')
-        self.socket.setsockopt(zmq.IDENTITY, self.session.bsession)
-        self.socket.connect(self.address)
-        self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
-        self.stream.on_recv(self._handle_recv)
-        self._run_loop()
-
-    def call_handlers(self, msg):
-        """This method is called in the ioloop thread when a message arrives.
-
-        Subclasses should override this method to handle incoming messages.
-        It is important to remember that this method is called in the thread
-        so that some logic must be done to ensure that the application leve
-        handlers are called in the application thread.
-        """
-        raise NotImplementedError('call_handlers must be defined in a subclass.')
-
-    def flush(self, timeout=1.0):
-        """Immediately processes all pending messages on the iopub channel.
-
-        Callers should use this method to ensure that :meth:`call_handlers`
-        has been called for all messages that have been received on the
-        0MQ SUB socket of this channel.
-
-        This method is thread safe.
-
-        Parameters
-        ----------
-        timeout : float, optional
-            The maximum amount of time to spend flushing, in seconds. The
-            default is one second.
-        """
-        # We do the IOLoop callback process twice to ensure that the IOLoop
-        # gets to perform at least one full poll.
-        stop_time = time.time() + timeout
-        for i in range(2):
-            self._flushed = False
-            self.ioloop.add_callback(self._flush)
-            while not self._flushed and time.time() < stop_time:
-                time.sleep(0.01)
-
-    def _flush(self):
-        """Callback for :method:`self.flush`."""
-        self.stream.flush()
-        self._flushed = True
-
-
-class StdInChannel(ZMQSocketChannel):
-    """The stdin channel to handle raw_input requests that the kernel makes."""
-
-    msg_queue = None
-    proxy_methods = ['input']
-
-    def __init__(self, context, session, address):
-        super(StdInChannel, self).__init__(context, session, address)
-        self.ioloop = ioloop.IOLoop()
-
-    def run(self):
-        """The thread's main activity.  Call start() instead."""
-        self.socket = self.context.socket(zmq.DEALER)
-        self.socket.linger = 1000
-        self.socket.setsockopt(zmq.IDENTITY, self.session.bsession)
-        self.socket.connect(self.address)
-        self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
-        self.stream.on_recv(self._handle_recv)
-        self._run_loop()
-
-    def call_handlers(self, msg):
-        """This method is called in the ioloop thread when a message arrives.
-
-        Subclasses should override this method to handle incoming messages.
-        It is important to remember that this method is called in the thread
-        so that some logic must be done to ensure that the application leve
-        handlers are called in the application thread.
-        """
-        raise NotImplementedError('call_handlers must be defined in a subclass.')
-
-    def input(self, string):
-        """Send a string of raw input to the kernel."""
-        content = dict(value=string)
-        msg = self.session.msg('input_reply', content)
-        self._queue_send(msg)
-
-
-class HBChannel(ZMQSocketChannel):
-    """The heartbeat channel which monitors the kernel heartbeat.
-
-    Note that the heartbeat channel is paused by default. As long as you start
-    this channel, the kernel manager will ensure that it is paused and un-paused
-    as appropriate.
-    """
-
-    time_to_dead = 3.0
-    socket = None
-    poller = None
-    _running = None
-    _pause = None
-    _beating = None
-
-    def __init__(self, context, session, address):
-        super(HBChannel, self).__init__(context, session, address)
         self._running = False
-        self._pause =True
+        self._pause = True
         self.poller = zmq.Poller()
 
+    def _notice_exit(self):
+        self._exiting = True
+
     def _create_socket(self):
         if self.socket is not None:
             # close previous socket, before opening a new one
@@ -621,7 +178,16 b' class HBChannel(ZMQSocketChannel):'
     def stop(self):
         """Stop the channel's event loop and join its thread."""
         self._running = False
-        super(HBChannel, self).stop()
+        self.join()
+        self.close()
+
+    def close(self):
+        if self.socket is not None:
+            try:
+                self.socket.close(linger=0)
+            except Exception:
+                pass
+            self.socket = None
 
     def call_handlers(self, since_last_heartbeat):
         """This method is called in the ioloop thread when a message arrives.
@@ -631,14 +197,7 b' class HBChannel(ZMQSocketChannel):'
         so that some logic must be done to ensure that the application level
         handlers are called in the application thread.
         """
-        raise NotImplementedError('call_handlers must be defined in a subclass.')
+        pass
 
 
-#---------------------------------------------------------------------#-----------------------------------------------------------------------------
-# ABC Registration
-#-----------------------------------------------------------------------------
-
-ShellChannelABC.register(ShellChannel)
-IOPubChannelABC.register(IOPubChannel)
 HBChannelABC.register(HBChannel)
-StdInChannelABC.register(StdInChannel)

IPython/kernel/channelsabc.py

@@ -24,70 +24,6 b' class ChannelABC(with_metaclass(abc.ABCMeta, object)):'
         pass
 
 
-class ShellChannelABC(ChannelABC):
-    """ShellChannel ABC.
-
-    The docstrings for this class can be found in the base implementation:
-
-    `IPython.kernel.channels.ShellChannel`
-    """
-
-    @abc.abstractproperty
-    def allow_stdin(self):
-        pass
-
-    @abc.abstractmethod
-    def execute(self, code, silent=False, store_history=True,
-                user_expressions=None, allow_stdin=None):
-        pass
-
-    @abc.abstractmethod
-    def complete(self, text, line, cursor_pos, block=None):
-        pass
-
-    @abc.abstractmethod
-    def inspect(self, oname, detail_level=0):
-        pass
-
-    @abc.abstractmethod
-    def history(self, raw=True, output=False, hist_access_type='range', **kwargs):
-        pass
-
-    @abc.abstractmethod
-    def kernel_info(self):
-        pass
-
-    @abc.abstractmethod
-    def shutdown(self, restart=False):
-        pass
-
-
-class IOPubChannelABC(ChannelABC):
-    """IOPubChannel ABC.
-
-    The docstrings for this class can be found in the base implementation:
-
-    `IPython.kernel.channels.IOPubChannel`
-    """
-
-    @abc.abstractmethod
-    def flush(self, timeout=1.0):
-        pass
-
-
-class StdInChannelABC(ChannelABC):
-    """StdInChannel ABC.
-
-    The docstrings for this class can be found in the base implementation:
-
-    `IPython.kernel.channels.StdInChannel`
-    """
-
-    @abc.abstractmethod
-    def input(self, string):
-        pass
-
-
 class HBChannelABC(ChannelABC):
     """HBChannel ABC.
 

IPython/kernel/client.py

@@ -4,6 +4,8 b''
 # Distributed under the terms of the Modified BSD License.
 
 from __future__ import absolute_import
+from IPython.kernel.channels import major_protocol_version
+from IPython.utils.py3compat import string_types, iteritems
 
 import zmq
 
@@ -11,15 +13,25 b' from IPython.utils.traitlets import ('
     Any, Instance, Type,
 )
 
-from .zmq.session import Session
-from .channels import (
-    ShellChannel, IOPubChannel,
-    HBChannel, StdInChannel,
-)
+from .channelsabc import (ChannelABC, HBChannelABC)
 from .clientabc import KernelClientABC
 from .connect import ConnectionFileMixin
 
 
+# some utilities to validate message structure, these might get moved elsewhere
+# if they prove to have more generic utility
+
+def validate_string_dict(dct):
+    """Validate that the input is a dict with string keys and values.
+
+    Raises ValueError if not."""
+    for k,v in iteritems(dct):
+        if not isinstance(k, string_types):
+            raise ValueError('key %r in dict must be a string' % k)
+        if not isinstance(v, string_types):
+            raise ValueError('value %r in dict must be a string' % v)
+
+
 class KernelClient(ConnectionFileMixin):
     """Communicates with a single kernel on any host via zmq channels.
 
@@ -42,10 +54,10 b' class KernelClient(ConnectionFileMixin):'
         return zmq.Context.instance()
 
     # The classes to use for the various channels
-    shell_channel_class = Type(ShellChannel)
-    iopub_channel_class = Type(IOPubChannel)
-    stdin_channel_class = Type(StdInChannel)
-    hb_channel_class = Type(HBChannel)
+    shell_channel_class = Type(ChannelABC)
+    iopub_channel_class = Type(ChannelABC)
+    stdin_channel_class = Type(ChannelABC)
+    hb_channel_class = Type(HBChannelABC)
 
     # Protected traits
     _shell_channel = Any
@@ -53,6 +65,9 b' class KernelClient(ConnectionFileMixin):'
     _stdin_channel = Any
     _hb_channel = Any
 
+    # flag for whether execute requests should be allowed to call raw_input:
+    allow_stdin = True
+
     #--------------------------------------------------------------------------
     # Channel proxy methods
     #--------------------------------------------------------------------------
@@ -87,19 +102,14 b' class KernelClient(ConnectionFileMixin):'
         """
         if shell:
             self.shell_channel.start()
-            for method in self.shell_channel.proxy_methods:
-                setattr(self, method, getattr(self.shell_channel, method))
+            self.kernel_info()
         if iopub:
             self.iopub_channel.start()
-            for method in self.iopub_channel.proxy_methods:
-                setattr(self, method, getattr(self.iopub_channel, method))
         if stdin:
             self.stdin_channel.start()
-            for method in self.stdin_channel.proxy_methods:
-                setattr(self, method, getattr(self.stdin_channel, method))
-            self.shell_channel.allow_stdin = True
+            self.allow_stdin = True
         else:
-            self.shell_channel.allow_stdin = False
+            self.allow_stdin = False
         if hb:
             self.hb_channel.start()
 
@@ -123,14 +133,17 b' class KernelClient(ConnectionFileMixin):'
         return (self.shell_channel.is_alive() or self.iopub_channel.is_alive() or
                 self.stdin_channel.is_alive() or self.hb_channel.is_alive())
 
+    ioloop = None  # Overridden in subclasses that use pyzmq event loop
+
     @property
     def shell_channel(self):
         """Get the shell channel object for this kernel."""
         if self._shell_channel is None:
             url = self._make_url('shell')
             self.log.debug("connecting shell channel to %s", url)
+            socket = self.connect_shell(identity=self.session.bsession)
             self._shell_channel = self.shell_channel_class(
-                self.context, self.session, url
+                socket, self.session, self.ioloop
             )
         return self._shell_channel
 
@@ -140,8 +153,9 b' class KernelClient(ConnectionFileMixin):'
         if self._iopub_channel is None:
             url = self._make_url('iopub')
             self.log.debug("connecting iopub channel to %s", url)
+            socket = self.connect_iopub()
             self._iopub_channel = self.iopub_channel_class(
-                self.context, self.session, url
+                socket, self.session, self.ioloop
             )
         return self._iopub_channel
 
@@ -151,8 +165,9 b' class KernelClient(ConnectionFileMixin):'
         if self._stdin_channel is None:
             url = self._make_url('stdin')
             self.log.debug("connecting stdin channel to %s", url)
+            socket = self.connect_stdin(identity=self.session.bsession)
             self._stdin_channel = self.stdin_channel_class(
-                self.context, self.session, url
+                socket, self.session, self.ioloop
             )
         return self._stdin_channel
 
@@ -179,8 +194,193 b' class KernelClient(ConnectionFileMixin):'
             return True
 
 
-#-----------------------------------------------------------------------------
-# ABC Registration
-#-----------------------------------------------------------------------------
+    # Methods to send specific messages on channels
+    def execute(self, code, silent=False, store_history=True,
+                user_expressions=None, allow_stdin=None):
+        """Execute code in the kernel.
+
+        Parameters
+        ----------
+        code : str
+            A string of Python code.
+
+        silent : bool, optional (default False)
+            If set, the kernel will execute the code as quietly possible, and
+            will force store_history to be False.
+
+        store_history : bool, optional (default True)
+            If set, the kernel will store command history.  This is forced
+            to be False if silent is True.
+
+        user_expressions : dict, optional
+            A dict mapping names to expressions to be evaluated in the user's
+            dict. The expression values are returned as strings formatted using
+            :func:`repr`.
+
+        allow_stdin : bool, optional (default self.allow_stdin)
+            Flag for whether the kernel can send stdin requests to frontends.
+
+            Some frontends (e.g. the Notebook) do not support stdin requests.
+            If raw_input is called from code executed from such a frontend, a
+            StdinNotImplementedError will be raised.
+
+        Returns
+        -------
+        The msg_id of the message sent.
+        """
+        if user_expressions is None:
+            user_expressions = {}
+        if allow_stdin is None:
+            allow_stdin = self.allow_stdin
+
+
+        # Don't waste network traffic if inputs are invalid
+        if not isinstance(code, string_types):
+            raise ValueError('code %r must be a string' % code)
+        validate_string_dict(user_expressions)
+
+        # Create class for content/msg creation. Related to, but possibly
+        # not in Session.
+        content = dict(code=code, silent=silent, store_history=store_history,
+                       user_expressions=user_expressions,
+                       allow_stdin=allow_stdin,
+                       )
+        msg = self.session.msg('execute_request', content)
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def complete(self, code, cursor_pos=None):
+        """Tab complete text in the kernel's namespace.
+
+        Parameters
+        ----------
+        code : str
+            The context in which completion is requested.
+            Can be anything between a variable name and an entire cell.
+        cursor_pos : int, optional
+            The position of the cursor in the block of code where the completion was requested.
+            Default: ``len(code)``
+
+        Returns
+        -------
+        The msg_id of the message sent.
+        """
+        if cursor_pos is None:
+            cursor_pos = len(code)
+        content = dict(code=code, cursor_pos=cursor_pos)
+        msg = self.session.msg('complete_request', content)
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def inspect(self, code, cursor_pos=None, detail_level=0):
+        """Get metadata information about an object in the kernel's namespace.
+
+        It is up to the kernel to determine the appropriate object to inspect.
+
+        Parameters
+        ----------
+        code : str
+            The context in which info is requested.
+            Can be anything between a variable name and an entire cell.
+        cursor_pos : int, optional
+            The position of the cursor in the block of code where the info was requested.
+            Default: ``len(code)``
+        detail_level : int, optional
+            The level of detail for the introspection (0-2)
+
+        Returns
+        -------
+        The msg_id of the message sent.
+        """
+        if cursor_pos is None:
+            cursor_pos = len(code)
+        content = dict(code=code, cursor_pos=cursor_pos,
+            detail_level=detail_level,
+        )
+        msg = self.session.msg('inspect_request', content)
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def history(self, raw=True, output=False, hist_access_type='range', **kwargs):
+        """Get entries from the kernel's history list.
+
+        Parameters
+        ----------
+        raw : bool
+            If True, return the raw input.
+        output : bool
+            If True, then return the output as well.
+        hist_access_type : str
+            'range' (fill in session, start and stop params), 'tail' (fill in n)
+             or 'search' (fill in pattern param).
+
+        session : int
+            For a range request, the session from which to get lines. Session
+            numbers are positive integers; negative ones count back from the
+            current session.
+        start : int
+            The first line number of a history range.
+        stop : int
+            The final (excluded) line number of a history range.
+
+        n : int
+            The number of lines of history to get for a tail request.
+
+        pattern : str
+            The glob-syntax pattern for a search request.
+
+        Returns
+        -------
+        The msg_id of the message sent.
+        """
+        content = dict(raw=raw, output=output, hist_access_type=hist_access_type,
+                                                                    **kwargs)
+        msg = self.session.msg('history_request', content)
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def kernel_info(self):
+        """Request kernel info."""
+        msg = self.session.msg('kernel_info_request')
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def _handle_kernel_info_reply(self, msg):
+        """handle kernel info reply
+
+        sets protocol adaptation version
+        """
+        adapt_version = int(msg['content']['protocol_version'].split('.')[0])
+        if adapt_version != major_protocol_version:
+            self.session.adapt_version = adapt_version
+
+    def shutdown(self, restart=False):
+        """Request an immediate kernel shutdown.
+
+        Upon receipt of the (empty) reply, client code can safely assume that
+        the kernel has shut down and it's safe to forcefully terminate it if
+        it's still alive.
+
+        The kernel will send the reply via a function registered with Python's
+        atexit module, ensuring it's truly done as the kernel is done with all
+        normal operation.
+        """
+        # Send quit message to kernel. Once we implement kernel-side setattr,
+        # this should probably be done that way, but for now this will do.
+        msg = self.session.msg('shutdown_request', {'restart':restart})
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def is_complete(self, code):
+        msg = self.session.msg('is_complete_request', {'code': code})
+        self.shell_channel.send(msg)
+        return msg['header']['msg_id']
+
+    def input(self, string):
+        """Send a string of raw input to the kernel."""
+        content = dict(value=string)
+        msg = self.session.msg('input_reply', content)
+        self.stdin_channel.send(msg)
+
 
 KernelClientABC.register(KernelClient)

IPython/kernel/inprocess/__init__.py

@@ -1,7 +1,5 b''
 from .channels import (
-    InProcessShellChannel,
-    InProcessIOPubChannel,
-    InProcessStdInChannel,
+    InProcessChannel,
     InProcessHBChannel,
 )
 

IPython/kernel/inprocess/blocking.py

@@ -9,35 +9,55 b' Useful for test suites and blocking terminal interfaces.'
 #  the file COPYING.txt, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
+try:
+    from queue import Queue, Empty  # Py 3
+except ImportError:
+    from Queue import Queue, Empty  # Py 2
 
 # IPython imports
 from IPython.utils.io import raw_print
 from IPython.utils.traitlets import Type
-from IPython.kernel.blocking.channels import BlockingChannelMixin
+#from IPython.kernel.blocking.channels import BlockingChannelMixin
 
 # Local imports
 from .channels import (
-    InProcessShellChannel,
-    InProcessIOPubChannel,
-    InProcessStdInChannel,
+    InProcessChannel,
 )
 from .client import InProcessKernelClient
 
-#-----------------------------------------------------------------------------
-# Blocking kernel manager
-#-----------------------------------------------------------------------------
+class BlockingInProcessChannel(InProcessChannel):
+
+    def __init__(self, *args, **kwds):
+        super(BlockingInProcessChannel, self).__init__(*args, **kwds)
+        self._in_queue = Queue()
 
-class BlockingInProcessShellChannel(BlockingChannelMixin, InProcessShellChannel):
-    pass
+    def call_handlers(self, msg):
+        self._in_queue.put(msg)
+
+    def get_msg(self, block=True, timeout=None):
+        """ Gets a message if there is one that is ready. """
+        if timeout is None:
+            # Queue.get(timeout=None) has stupid uninteruptible
+            # behavior, so wait for a week instead
+            timeout = 604800
+        return self._in_queue.get(block, timeout)
+
+    def get_msgs(self):
+        """ Get all messages that are currently ready. """
+        msgs = []
+        while True:
+            try:
+                msgs.append(self.get_msg(block=False))
+            except Empty:
+                break
+        return msgs
 
-class BlockingInProcessIOPubChannel(BlockingChannelMixin, InProcessIOPubChannel):
-    pass
+    def msg_ready(self):
+        """ Is there a message that has been received? """
+        return not self._in_queue.empty()
 
-class BlockingInProcessStdInChannel(BlockingChannelMixin, InProcessStdInChannel):
 
+class BlockingInProcessStdInChannel(BlockingInProcessChannel):
     def call_handlers(self, msg):
         """ Overridden for the in-process channel.
 
@@ -48,11 +68,27 b' class BlockingInProcessStdInChannel(BlockingChannelMixin, InProcessStdInChannel)'
             _raw_input = self.client.kernel._sys_raw_input
             prompt = msg['content']['prompt']
             raw_print(prompt, end='')
-            self.input(_raw_input())
+            self.client.input(_raw_input())
 
 class BlockingInProcessKernelClient(InProcessKernelClient):
 
     # The classes to use for the various channels.
-    shell_channel_class = Type(BlockingInProcessShellChannel)
-    iopub_channel_class = Type(BlockingInProcessIOPubChannel)
+    shell_channel_class = Type(BlockingInProcessChannel)
+    iopub_channel_class = Type(BlockingInProcessChannel)
     stdin_channel_class = Type(BlockingInProcessStdInChannel)
+
+    def wait_for_ready(self):
+        # Wait for kernel info reply on shell channel
+        while True:
+            msg = self.shell_channel.get_msg(block=True)
+            if msg['msg_type'] == 'kernel_info_reply':
+                self._handle_kernel_info_reply(msg)
+                break
+
+        # Flush IOPub channel
+        while True:
+            try:
+                msg = self.iopub_channel.get_msg(block=True, timeout=0.2)
+                print(msg['msg_type'])
+            except Empty:
+                break

IPython/kernel/inprocess/channels.py

@@ -3,10 +3,7 b''
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-from IPython.kernel.channelsabc import (
-    ShellChannelABC, IOPubChannelABC,
-    HBChannelABC, StdInChannelABC,
-)
+from IPython.kernel.channelsabc import HBChannelABC
 
 from .socket import DummySocket
 
@@ -23,10 +20,6 b' class InProcessChannel(object):'
         self.client = client
         self._is_alive = False
 
-    #--------------------------------------------------------------------------
-    # Channel interface
-    #--------------------------------------------------------------------------
-
     def is_alive(self):
         return self._is_alive
 
@@ -43,9 +36,9 b' class InProcessChannel(object):'
         """
         raise NotImplementedError('call_handlers must be defined in a subclass.')
 
-    #--------------------------------------------------------------------------
-    # InProcessChannel interface
-    #--------------------------------------------------------------------------
+    def flush(self, timeout=1.0):
+        pass
+
 
     def call_handlers_later(self, *args, **kwds):
         """ Call the message handlers later.
@@ -65,117 +58,31 b' class InProcessChannel(object):'
         raise NotImplementedError
 
 
-class InProcessShellChannel(InProcessChannel):
-    """See `IPython.kernel.channels.ShellChannel` for docstrings."""
-
-    # flag for whether execute requests should be allowed to call raw_input
-    allow_stdin = True
-    proxy_methods = [
-        'execute',
-        'complete',
-        'inspect',
-        'history',
-        'shutdown',
-        'kernel_info',
-    ]
-
-    #--------------------------------------------------------------------------
-    # ShellChannel interface
-    #--------------------------------------------------------------------------
-
-    def execute(self, code, silent=False, store_history=True,
-                user_expressions={}, allow_stdin=None):
-        if allow_stdin is None:
-            allow_stdin = self.allow_stdin
-        content = dict(code=code, silent=silent, store_history=store_history,
-                       user_expressions=user_expressions,
-                       allow_stdin=allow_stdin)
-        msg = self.client.session.msg('execute_request', content)
-        self._dispatch_to_kernel(msg)
-        return msg['header']['msg_id']
-
-    def complete(self, code, cursor_pos=None):
-        if cursor_pos is None:
-            cursor_pos = len(code)
-        content = dict(code=code, cursor_pos=cursor_pos)
-        msg = self.client.session.msg('complete_request', content)
-        self._dispatch_to_kernel(msg)
-        return msg['header']['msg_id']
-
-    def inspect(self, code, cursor_pos=None, detail_level=0):
-        if cursor_pos is None:
-            cursor_pos = len(code)
-        content = dict(code=code, cursor_pos=cursor_pos,
-            detail_level=detail_level,
-        )
-        msg = self.client.session.msg('inspect_request', content)
-        self._dispatch_to_kernel(msg)
-        return msg['header']['msg_id']
-
-    def history(self, raw=True, output=False, hist_access_type='range', **kwds):
-        content = dict(raw=raw, output=output,
-                       hist_access_type=hist_access_type, **kwds)
-        msg = self.client.session.msg('history_request', content)
-        self._dispatch_to_kernel(msg)
-        return msg['header']['msg_id']
-
-    def shutdown(self, restart=False):
-        # FIXME: What to do here?
-        raise NotImplementedError('Cannot shutdown in-process kernel')
-
-    def kernel_info(self):
-        """Request kernel info."""
-        msg = self.client.session.msg('kernel_info_request')
-        self._dispatch_to_kernel(msg)
-        return msg['header']['msg_id']
-
-    #--------------------------------------------------------------------------
-    # Protected interface
-    #--------------------------------------------------------------------------
-
-    def _dispatch_to_kernel(self, msg):
-        """ Send a message to the kernel and handle a reply.
-        """
-        kernel = self.client.kernel
-        if kernel is None:
-            raise RuntimeError('Cannot send request. No kernel exists.')
-
-        stream = DummySocket()
-        self.client.session.send(stream, msg)
-        msg_parts = stream.recv_multipart()
-        kernel.dispatch_shell(stream, msg_parts)
-
-        idents, reply_msg = self.client.session.recv(stream, copy=False)
-        self.call_handlers_later(reply_msg)
 
+class InProcessHBChannel(object):
+    """A dummy heartbeat channel interface for in-process kernels.
 
-class InProcessIOPubChannel(InProcessChannel):
-    """See `IPython.kernel.channels.IOPubChannel` for docstrings."""
+    Normally we use the heartbeat to check that the kernel process is alive.
+    When the kernel is in-process, that doesn't make sense, but clients still
+    expect this interface.
+    """
 
-    def flush(self, timeout=1.0):
-        pass
-
-
-class InProcessStdInChannel(InProcessChannel):
-    """See `IPython.kernel.channels.StdInChannel` for docstrings."""
-
-    proxy_methods = ['input']
-
-    def input(self, string):
-        kernel = self.client.kernel
-        if kernel is None:
-            raise RuntimeError('Cannot send input reply. No kernel exists.')
-        kernel.raw_input_str = string
+    time_to_dead = 3.0
 
+    def __init__(self, client=None):
+        super(InProcessHBChannel, self).__init__()
+        self.client = client
+        self._is_alive = False
+        self._pause = True
 
-class InProcessHBChannel(InProcessChannel):
-    """See `IPython.kernel.channels.HBChannel` for docstrings."""
+    def is_alive(self):
+        return self._is_alive
 
-    time_to_dead = 3.0
+    def start(self):
+        self._is_alive = True
 
-    def __init__(self, *args, **kwds):
-        super(InProcessHBChannel, self).__init__(*args, **kwds)
-        self._pause = True
+    def stop(self):
+        self._is_alive = False
 
     def pause(self):
         self._pause = True
@@ -186,11 +93,5 b' class InProcessHBChannel(InProcessChannel):'
     def is_beating(self):
         return not self._pause
 
-#-----------------------------------------------------------------------------
-# ABC Registration
-#-----------------------------------------------------------------------------
 
-ShellChannelABC.register(InProcessShellChannel)
-IOPubChannelABC.register(InProcessIOPubChannel)
 HBChannelABC.register(InProcessHBChannel)
-StdInChannelABC.register(InProcessStdInChannel)

IPython/kernel/inprocess/client.py

@@ -12,16 +12,15 b''
 #-----------------------------------------------------------------------------
 
 # IPython imports
+from IPython.kernel.inprocess.socket import DummySocket
 from IPython.utils.traitlets import Type, Instance
 from IPython.kernel.clientabc import KernelClientABC
 from IPython.kernel.client import KernelClient
 
 # Local imports
 from .channels import (
-    InProcessShellChannel,
-    InProcessIOPubChannel,
+    InProcessChannel,
     InProcessHBChannel,
-    InProcessStdInChannel,
 
 )
 
@@ -40,9 +39,9 b' class InProcessKernelClient(KernelClient):'
     """
 
     # The classes to use for the various channels.
-    shell_channel_class = Type(InProcessShellChannel)
-    iopub_channel_class = Type(InProcessIOPubChannel)
-    stdin_channel_class = Type(InProcessStdInChannel)
+    shell_channel_class = Type(InProcessChannel)
+    iopub_channel_class = Type(InProcessChannel)
+    stdin_channel_class = Type(InProcessChannel)
     hb_channel_class = Type(InProcessHBChannel)
 
     kernel = Instance('IPython.kernel.inprocess.ipkernel.InProcessKernel')
@@ -79,6 +78,76 b' class InProcessKernelClient(KernelClient):'
             self._hb_channel = self.hb_channel_class(self)
         return self._hb_channel
 
+    # Methods for sending specific messages
+    # -------------------------------------
+
+    def execute(self, code, silent=False, store_history=True,
+                user_expressions={}, allow_stdin=None):
+        if allow_stdin is None:
+            allow_stdin = self.allow_stdin
+        content = dict(code=code, silent=silent, store_history=store_history,
+                       user_expressions=user_expressions,
+                       allow_stdin=allow_stdin)
+        msg = self.session.msg('execute_request', content)
+        self._dispatch_to_kernel(msg)
+        return msg['header']['msg_id']
+
+    def complete(self, code, cursor_pos=None):
+        if cursor_pos is None:
+            cursor_pos = len(code)
+        content = dict(code=code, cursor_pos=cursor_pos)
+        msg = self.session.msg('complete_request', content)
+        self._dispatch_to_kernel(msg)
+        return msg['header']['msg_id']
+
+    def inspect(self, code, cursor_pos=None, detail_level=0):
+        if cursor_pos is None:
+            cursor_pos = len(code)
+        content = dict(code=code, cursor_pos=cursor_pos,
+            detail_level=detail_level,
+        )
+        msg = self.session.msg('inspect_request', content)
+        self._dispatch_to_kernel(msg)
+        return msg['header']['msg_id']
+
+    def history(self, raw=True, output=False, hist_access_type='range', **kwds):
+        content = dict(raw=raw, output=output,
+                       hist_access_type=hist_access_type, **kwds)
+        msg = self.session.msg('history_request', content)
+        self._dispatch_to_kernel(msg)
+        return msg['header']['msg_id']
+
+    def shutdown(self, restart=False):
+        # FIXME: What to do here?
+        raise NotImplementedError('Cannot shutdown in-process kernel')
+
+    def kernel_info(self):
+        """Request kernel info."""
+        msg = self.session.msg('kernel_info_request')
+        self._dispatch_to_kernel(msg)
+        return msg['header']['msg_id']
+
+    def input(self, string):
+        if self.kernel is None:
+            raise RuntimeError('Cannot send input reply. No kernel exists.')
+        self.kernel.raw_input_str = string
+
+
+    def _dispatch_to_kernel(self, msg):
+        """ Send a message to the kernel and handle a reply.
+        """
+        kernel = self.kernel
+        if kernel is None:
+            raise RuntimeError('Cannot send request. No kernel exists.')
+
+        stream = DummySocket()
+        self.session.send(stream, msg)
+        msg_parts = stream.recv_multipart()
+        kernel.dispatch_shell(stream, msg_parts)
+
+        idents, reply_msg = self.session.recv(stream, copy=False)
+        self.shell_channel.call_handlers_later(reply_msg)
+
 
 #-----------------------------------------------------------------------------
 # ABC Registration

IPython/kernel/inprocess/tests/test_kernel.py

@@ -26,6 +26,7 b' class InProcessKernelTestCase(unittest.TestCase):'
         self.km.start_kernel()
         self.kc = BlockingInProcessKernelClient(kernel=self.km.kernel)
         self.kc.start_channels()
+        self.kc.wait_for_ready()
 
     @skipif_not_matplotlib
     def test_pylab(self):
@@ -61,7 +62,7 b' class InProcessKernelTestCase(unittest.TestCase):'
 
         kc = BlockingInProcessKernelClient(kernel=kernel)
         kernel.frontends.append(kc)
-        kc.shell_channel.execute('print("bar")')
+        kc.execute('print("bar")')
         msg = get_stream_message(kc)
         self.assertEqual(msg['content']['text'], 'bar\n')
 

IPython/kernel/inprocess/tests/test_kernelmanager.py

@@ -51,6 +51,7 b' class InProcessKernelManagerTestCase(unittest.TestCase):'
         km.start_kernel()
         kc = BlockingInProcessKernelClient(kernel=km.kernel)
         kc.start_channels()
+        kc.wait_for_ready()
         kc.execute('foo = 1')
         self.assertEquals(km.kernel.shell.user_ns['foo'], 1)
 
@@ -61,6 +62,7 b' class InProcessKernelManagerTestCase(unittest.TestCase):'
         km.start_kernel()
         kc = BlockingInProcessKernelClient(kernel=km.kernel)
         kc.start_channels()
+        kc.wait_for_ready()
         km.kernel.shell.push({'my_bar': 0, 'my_baz': 1})
         kc.complete('my_ba', 5)
         msg = kc.get_shell_msg()
@@ -75,6 +77,7 b' class InProcessKernelManagerTestCase(unittest.TestCase):'
         km.start_kernel()
         kc = BlockingInProcessKernelClient(kernel=km.kernel)
         kc.start_channels()
+        kc.wait_for_ready()
         km.kernel.shell.user_ns['foo'] = 1
         kc.inspect('foo')
         msg = kc.get_shell_msg()
@@ -91,6 +94,7 b' class InProcessKernelManagerTestCase(unittest.TestCase):'
         km.start_kernel()
         kc = BlockingInProcessKernelClient(kernel=km.kernel)
         kc.start_channels()
+        kc.wait_for_ready()
         kc.execute('%who')
         kc.history(hist_access_type='tail', n=1)
         msg = kc.shell_channel.get_msgs()[-1]

IPython/kernel/manager.py

@@ -420,17 +420,8 b" def start_new_kernel(startup_timeout=60, kernel_name='python', **kwargs):"
     km.start_kernel(**kwargs)
     kc = km.client()
     kc.start_channels()
+    kc.wait_for_ready()
 
-    kc.kernel_info()
-    kc.get_shell_msg(block=True, timeout=startup_timeout)
-
-    # Flush channels
-    for channel in (kc.shell_channel, kc.iopub_channel):
-        while True:
-            try:
-                channel.get_msg(block=True, timeout=0.1)
-            except Empty:
-                break
     return km, kc
 
 @contextmanager

IPython/kernel/zmq/tests/test_embed_kernel.py

@@ -92,6 +92,7 b' def setup_kernel(cmd):'
     client = BlockingKernelClient(connection_file=connection_file)
     client.load_connection_file()
     client.start_channels()
+    client.wait_for_ready()
     
     try:
         yield client

IPython/nbconvert/preprocessors/execute.py

@@ -46,7 +46,7 b' class ExecutePreprocessor(Preprocessor):'
         if cell.cell_type != 'code':
             return cell, resources
         try:
-            outputs = self.run_cell(self.kc.shell_channel, self.kc.iopub_channel, cell)
+            outputs = self.run_cell(cell)
         except Exception as e:
             self.log.error("failed to run cell: " + repr(e))
             self.log.error(str(cell.source))
@@ -54,13 +54,13 b' class ExecutePreprocessor(Preprocessor):'
         cell.outputs = outputs
         return cell, resources
 
-    def run_cell(self, shell, iopub, cell):
-        msg_id = shell.execute(cell.source)
+    def run_cell(self, cell):
+        msg_id = self.kc.execute(cell.source)
         self.log.debug("Executing cell:\n%s", cell.source)
         # wait for finish, with timeout
         while True:
             try:
-                msg = shell.get_msg(timeout=self.timeout)
+                msg = self.kc.shell_channel.get_msg(timeout=self.timeout)
             except Empty:
                 self.log.error("Timeout waiting for execute reply")
                 raise
@@ -74,7 +74,7 b' class ExecutePreprocessor(Preprocessor):'
 
         while True:
             try:
-                msg = iopub.get_msg(timeout=self.timeout)
+                msg = self.kc.iopub_channel.get_msg(timeout=self.timeout)
             except Empty:
                 self.log.warn("Timeout waiting for IOPub output")
                 break

IPython/qt/client.py

@@ -1,37 +1,249 b''
 """ Defines a KernelClient that provides signals and slots.
 """
+import atexit
+import errno
+from threading import Thread
+import time
+
+import zmq
+# import ZMQError in top-level namespace, to avoid ugly attribute-error messages
+# during garbage collection of threads at exit:
+from zmq import ZMQError
+from zmq.eventloop import ioloop, zmqstream
+
+from IPython.external.qt import QtCore
 
 # Local imports
-from IPython.utils.traitlets import Type
-from IPython.kernel.channels import (
-    ShellChannel, IOPubChannel, StdInChannel, HBChannel
-)
+from IPython.utils.traitlets import Type, Instance
+from IPython.kernel.channels import HBChannel
 from IPython.kernel import KernelClient
 
-from .kernel_mixins import (
-    QtShellChannelMixin, QtIOPubChannelMixin,
-    QtStdInChannelMixin, QtHBChannelMixin,
-    QtKernelClientMixin
-)
+from .kernel_mixins import QtKernelClientMixin
+from .util import SuperQObject
 
-class QtShellChannel(QtShellChannelMixin, ShellChannel):
-    pass
+class QtHBChannel(SuperQObject, HBChannel):
+    # A longer timeout than the base class
+    time_to_dead = 3.0
 
-class QtIOPubChannel(QtIOPubChannelMixin, IOPubChannel):
-    pass
+    # Emitted when the kernel has died.
+    kernel_died = QtCore.Signal(object)
 
-class QtStdInChannel(QtStdInChannelMixin, StdInChannel):
-    pass
+    def call_handlers(self, since_last_heartbeat):
+        """ Reimplemented to emit signals instead of making callbacks.
+        """
+        # Emit the generic signal.
+        self.kernel_died.emit(since_last_heartbeat)
+
+from IPython.core.release import kernel_protocol_version_info
 
-class QtHBChannel(QtHBChannelMixin, HBChannel):
+major_protocol_version = kernel_protocol_version_info[0]
+
+class InvalidPortNumber(Exception):
     pass
 
 
+class QtZMQSocketChannel(SuperQObject):
+    """A ZMQ socket emitting a Qt signal when a message is received."""
+    session = None
+    socket = None
+    ioloop = None
+    stream = None
+
+    message_received = QtCore.Signal(object)
+
+    def process_events(self):
+        """ Process any pending GUI events.
+        """
+        QtCore.QCoreApplication.instance().processEvents()
+
+    def __init__(self, socket, session, loop):
+        """Create a channel.
+
+        Parameters
+        ----------
+        socket : :class:`zmq.Socket`
+            The ZMQ socket to use.
+        session : :class:`session.Session`
+            The session to use.
+        loop
+            A pyzmq ioloop to connect the socket to using a ZMQStream
+        """
+        super(QtZMQSocketChannel, self).__init__()
+
+        self.socket = socket
+        self.session = session
+        self.ioloop = loop
+
+        self.stream = zmqstream.ZMQStream(self.socket, self.ioloop)
+        self.stream.on_recv(self._handle_recv)
+
+    _is_alive = False
+    def is_alive(self):
+        return self._is_alive
+
+    def start(self):
+        self._is_alive = True
+
+    def stop(self):
+        self._is_alive = False
+
+    def close(self):
+        if self.socket is not None:
+            try:
+                self.socket.close(linger=0)
+            except Exception:
+                pass
+            self.socket = None
+
+    def send(self, msg):
+        """Queue a message to be sent from the IOLoop's thread.
+
+        Parameters
+        ----------
+        msg : message to send
+
+        This is threadsafe, as it uses IOLoop.add_callback to give the loop's
+        thread control of the action.
+        """
+        def thread_send():
+            self.session.send(self.stream, msg)
+        self.ioloop.add_callback(thread_send)
+
+    def _handle_recv(self, msg):
+        """Callback for stream.on_recv.
+
+        Unpacks message, and calls handlers with it.
+        """
+        ident,smsg = self.session.feed_identities(msg)
+        msg = self.session.deserialize(smsg)
+        self.call_handlers(msg)
+
+    def call_handlers(self, msg):
+        """This method is called in the ioloop thread when a message arrives.
+
+        Subclasses should override this method to handle incoming messages.
+        It is important to remember that this method is called in the thread
+        so that some logic must be done to ensure that the application level
+        handlers are called in the application thread.
+        """
+        # Emit the generic signal.
+        self.message_received.emit(msg)
+
+    def flush(self, timeout=1.0):
+        """Immediately processes all pending messages on this channel.
+
+        This is only used for the IOPub channel.
+
+        Callers should use this method to ensure that :meth:`call_handlers`
+        has been called for all messages that have been received on the
+        0MQ SUB socket of this channel.
+
+        This method is thread safe.
+
+        Parameters
+        ----------
+        timeout : float, optional
+            The maximum amount of time to spend flushing, in seconds. The
+            default is one second.
+        """
+        # We do the IOLoop callback process twice to ensure that the IOLoop
+        # gets to perform at least one full poll.
+        stop_time = time.time() + timeout
+        for i in range(2):
+            self._flushed = False
+            self.ioloop.add_callback(self._flush)
+            while not self._flushed and time.time() < stop_time:
+                time.sleep(0.01)
+
+    def _flush(self):
+        """Callback for :method:`self.flush`."""
+        self.stream.flush()
+        self._flushed = True
+
+
+class IOLoopThread(Thread):
+    """Run a pyzmq ioloop in a thread to send and receive messages
+    """
+    def __init__(self, loop):
+        super(IOLoopThread, self).__init__()
+        self.daemon = True
+        atexit.register(self._notice_exit)
+        self.ioloop = loop or ioloop.IOLoop()
+
+    def _notice_exit(self):
+        self._exiting = True
+
+    def run(self):
+        """Run my loop, ignoring EINTR events in the poller"""
+        while True:
+            try:
+                self.ioloop.start()
+            except ZMQError as e:
+                if e.errno == errno.EINTR:
+                    continue
+                else:
+                    raise
+            except Exception:
+                if self._exiting:
+                    break
+                else:
+                    raise
+            else:
+                break
+
+    def stop(self):
+        """Stop the channel's event loop and join its thread.
+
+        This calls :meth:`~threading.Thread.join` and returns when the thread
+        terminates. :class:`RuntimeError` will be raised if
+        :meth:`~threading.Thread.start` is called again.
+        """
+        if self.ioloop is not None:
+            self.ioloop.stop()
+        self.join()
+        self.close()
+
+    def close(self):
+        if self.ioloop is not None:
+            try:
+                self.ioloop.close(all_fds=True)
+            except Exception:
+                pass
+
+
 class QtKernelClient(QtKernelClientMixin, KernelClient):
     """ A KernelClient that provides signals and slots.
     """
 
-    iopub_channel_class = Type(QtIOPubChannel)
-    shell_channel_class = Type(QtShellChannel)
-    stdin_channel_class = Type(QtStdInChannel)
+    _ioloop = None
+    @property
+    def ioloop(self):
+        if self._ioloop is None:
+            self._ioloop = ioloop.IOLoop()
+        return self._ioloop
+
+    ioloop_thread = Instance(IOLoopThread)
+
+    def start_channels(self, shell=True, iopub=True, stdin=True, hb=True):
+        if shell:
+            self.shell_channel.message_received.connect(self._check_kernel_info_reply)
+
+        self.ioloop_thread = IOLoopThread(self.ioloop)
+        self.ioloop_thread.start()
+
+        super(QtKernelClient, self).start_channels(shell, iopub, stdin, hb)
+
+    def _check_kernel_info_reply(self, msg):
+        if msg['msg_type'] == 'kernel_info_reply':
+            self._handle_kernel_info_reply(msg)
+            self.shell_channel.message_received.disconnect(self._check_kernel_info_reply)
+
+    def stop_channels(self):
+        super(QtKernelClient, self).stop_channels()
+        if self.ioloop_thread.is_alive():
+            self.ioloop_thread.stop()
+
+    iopub_channel_class = Type(QtZMQSocketChannel)
+    shell_channel_class = Type(QtZMQSocketChannel)
+    stdin_channel_class = Type(QtZMQSocketChannel)
     hb_channel_class = Type(QtHBChannel)

IPython/qt/console/frontend_widget.py

@@ -82,6 +82,8 b' class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):'
     # The text to show when the kernel is (re)started.
     banner = Unicode(config=True)
     kernel_banner = Unicode()
+    # Whether to show the banner
+    _display_banner = Bool(False)
 
     # An option and corresponding signal for overriding the default kernel
     # interrupt behavior.
@@ -464,7 +466,7 b' class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):'
         self.kernel_client.iopub_channel.flush()
 
         def callback(line):
-            self.kernel_client.stdin_channel.input(line)
+            self.kernel_client.input(line)
         if self._reading:
             self.log.debug("Got second input request, assuming first was interrupted.")
             self._reading = False

IPython/qt/console/history_console_widget.py

@@ -225,7 +225,7 b' class HistoryConsoleWidget(ConsoleWidget):'
         return self._history[-n:]
 
     def _request_update_session_history_length(self):
-        msg_id = self.kernel_client.shell_channel.execute('',
+        msg_id = self.kernel_client.execute('',
             silent=True,
             user_expressions={
                 'hlen':'len(get_ipython().history_manager.input_hist_raw)',

IPython/qt/console/ipython_widget.py

@@ -203,7 +203,7 b' class IPythonWidget(FrontendWidget):'
                 self._retrying_history_request = True
                 # wait out the kernel's queue flush, which is currently timed at 0.1s
                 time.sleep(0.25)
-                self.kernel_client.shell_channel.history(hist_access_type='tail',n=1000)
+                self.kernel_client.history(hist_access_type='tail',n=1000)
             else:
                 self._retrying_history_request = False
             return
@@ -296,12 +296,11 b' class IPythonWidget(FrontendWidget):'
         # The reply will trigger %guiref load provided language=='python'
         self.kernel_client.kernel_info()
 
-        self.kernel_client.shell_channel.history(hist_access_type='tail',
-                                                  n=1000)
+        self.kernel_client.history(hist_access_type='tail', n=1000)
     
     def _load_guiref_magic(self):
         """Load %guiref magic."""
-        self.kernel_client.shell_channel.execute('\n'.join([
+        self.kernel_client.execute('\n'.join([
             "try:",
             "    _usage",
             "except:",
@@ -385,7 +384,7 b' class IPythonWidget(FrontendWidget):'
         """
         # If a number was not specified, make a prompt number request.
         if number is None:
-            msg_id = self.kernel_client.shell_channel.execute('', silent=True)
+            msg_id = self.kernel_client.execute('', silent=True)
             info = self._ExecutionRequest(msg_id, 'prompt')
             self._request_info['execute'][msg_id] = info
             return

IPython/qt/inprocess.py

@@ -2,38 +2,73 b''
 """
 
 # Local imports.
+from IPython.external.qt import QtCore
 from IPython.kernel.inprocess import (
-    InProcessShellChannel, InProcessIOPubChannel, InProcessStdInChannel,
     InProcessHBChannel, InProcessKernelClient, InProcessKernelManager,
 )
+from IPython.kernel.inprocess.channels import InProcessChannel
 
 from IPython.utils.traitlets import Type
+from .util import SuperQObject
 from .kernel_mixins import (
-    QtShellChannelMixin, QtIOPubChannelMixin,
-    QtStdInChannelMixin, QtHBChannelMixin, QtKernelClientMixin,
-    QtKernelManagerMixin,
+    QtKernelClientMixin, QtKernelManagerMixin,
 )
 
+class QtInProcessChannel(SuperQObject, InProcessChannel):
+    # Emitted when the channel is started.
+    started = QtCore.Signal()
 
-class QtInProcessShellChannel(QtShellChannelMixin, InProcessShellChannel):
-    pass
+    # Emitted when the channel is stopped.
+    stopped = QtCore.Signal()
 
-class QtInProcessIOPubChannel(QtIOPubChannelMixin, InProcessIOPubChannel):
-    pass
+    # Emitted when any message is received.
+    message_received = QtCore.Signal(object)
 
-class QtInProcessStdInChannel(QtStdInChannelMixin, InProcessStdInChannel):
-    pass
+    def start(self):
+        """ Reimplemented to emit signal.
+        """
+        super(QtInProcessChannel, self).start()
+        self.started.emit()
+
+    def stop(self):
+        """ Reimplemented to emit signal.
+        """
+        super(QtInProcessChannel, self).stop()
+        self.stopped.emit()
+
+    def call_handlers_later(self, *args, **kwds):
+        """ Call the message handlers later.
+        """
+        do_later = lambda: self.call_handlers(*args, **kwds)
+        QtCore.QTimer.singleShot(0, do_later)
+
+    def call_handlers(self, msg):
+        self.message_received.emit(msg)
+
+    def process_events(self):
+        """ Process any pending GUI events.
+        """
+        QtCore.QCoreApplication.instance().processEvents()
+
+    def flush(self, timeout=1.0):
+        """ Reimplemented to ensure that signals are dispatched immediately.
+        """
+        super(QtInProcessChannel, self).flush()
+        self.process_events()
+
+
+class QtInProcessHBChannel(SuperQObject, InProcessHBChannel):
+    # This signal will never be fired, but it needs to exist
+    kernel_died = QtCore.Signal()
 
-class QtInProcessHBChannel(QtHBChannelMixin, InProcessHBChannel):
-    pass
 
 class QtInProcessKernelClient(QtKernelClientMixin, InProcessKernelClient):
     """ An in-process KernelManager with signals and slots.
     """
 
-    iopub_channel_class = Type(QtInProcessIOPubChannel)
-    shell_channel_class = Type(QtInProcessShellChannel)
-    stdin_channel_class = Type(QtInProcessStdInChannel)
+    iopub_channel_class = Type(QtInProcessChannel)
+    shell_channel_class = Type(QtInProcessChannel)
+    stdin_channel_class = Type(QtInProcessChannel)
     hb_channel_class = Type(QtInProcessHBChannel)
 
 class QtInProcessKernelManager(QtKernelManagerMixin, InProcessKernelManager):

IPython/qt/kernel_mixins.py

@@ -9,146 +9,6 b' from IPython.utils.traitlets import HasTraits, Type'
 from .util import MetaQObjectHasTraits, SuperQObject
 
 
-class ChannelQObject(SuperQObject):
-
-    # Emitted when the channel is started.
-    started = QtCore.Signal()
-
-    # Emitted when the channel is stopped.
-    stopped = QtCore.Signal()
-
-    def start(self):
-        """ Reimplemented to emit signal.
-        """
-        super(ChannelQObject, self).start()
-        self.started.emit()
-
-    def stop(self):
-        """ Reimplemented to emit signal.
-        """
-        super(ChannelQObject, self).stop()
-        self.stopped.emit()
-
-    #---------------------------------------------------------------------------
-    # InProcessChannel interface
-    #---------------------------------------------------------------------------
-
-    def call_handlers_later(self, *args, **kwds):
-        """ Call the message handlers later.
-        """
-        do_later = lambda: self.call_handlers(*args, **kwds)
-        QtCore.QTimer.singleShot(0, do_later)
-
-    def process_events(self):
-        """ Process any pending GUI events.
-        """
-        QtCore.QCoreApplication.instance().processEvents()
-
-
-class QtShellChannelMixin(ChannelQObject):
-
-    # Emitted when any message is received.
-    message_received = QtCore.Signal(object)
-
-    # Emitted when a reply has been received for the corresponding request type.
-    execute_reply = QtCore.Signal(object)
-    complete_reply = QtCore.Signal(object)
-    inspect_reply = QtCore.Signal(object)
-    history_reply = QtCore.Signal(object)
-    kernel_info_reply = QtCore.Signal(object)
-
-    def call_handlers(self, msg):
-        """ Reimplemented to emit signals instead of making callbacks.
-        """
-        # Emit the generic signal.
-        self.message_received.emit(msg)
-
-        # Emit signals for specialized message types.
-        msg_type = msg['header']['msg_type']
-        if msg_type == 'kernel_info_reply':
-            self._handle_kernel_info_reply(msg)
-        
-        signal = getattr(self, msg_type, None)
-        if signal:
-            signal.emit(msg)
-
-
-class QtIOPubChannelMixin(ChannelQObject):
-
-    # Emitted when any message is received.
-    message_received = QtCore.Signal(object)
-
-    # Emitted when a message of type 'stream' is received.
-    stream_received = QtCore.Signal(object)
-
-    # Emitted when a message of type 'execute_input' is received.
-    execute_input_received = QtCore.Signal(object)
-
-    # Emitted when a message of type 'execute_result' is received.
-    execute_result_received = QtCore.Signal(object)
-
-    # Emitted when a message of type 'error' is received.
-    error_received = QtCore.Signal(object)
-
-    # Emitted when a message of type 'display_data' is received
-    display_data_received = QtCore.Signal(object)
-
-    # Emitted when a crash report message is received from the kernel's
-    # last-resort sys.excepthook.
-    crash_received = QtCore.Signal(object)
-
-    # Emitted when a shutdown is noticed.
-    shutdown_reply_received = QtCore.Signal(object)
-
-    def call_handlers(self, msg):
-        """ Reimplemented to emit signals instead of making callbacks.
-        """
-        # Emit the generic signal.
-        self.message_received.emit(msg)
-        # Emit signals for specialized message types.
-        msg_type = msg['header']['msg_type']
-        signal = getattr(self, msg_type + '_received', None)
-        if signal:
-            signal.emit(msg)
-
-    def flush(self):
-        """ Reimplemented to ensure that signals are dispatched immediately.
-        """
-        super(QtIOPubChannelMixin, self).flush()
-        QtCore.QCoreApplication.instance().processEvents()
-
-
-class QtStdInChannelMixin(ChannelQObject):
-
-    # Emitted when any message is received.
-    message_received = QtCore.Signal(object)
-
-    # Emitted when an input request is received.
-    input_requested = QtCore.Signal(object)
-
-    def call_handlers(self, msg):
-        """ Reimplemented to emit signals instead of making callbacks.
-        """
-        # Emit the generic signal.
-        self.message_received.emit(msg)
-
-        # Emit signals for specialized message types.
-        msg_type = msg['header']['msg_type']
-        if msg_type == 'input_request':
-            self.input_requested.emit(msg)
-
-
-class QtHBChannelMixin(ChannelQObject):
-
-    # Emitted when the kernel has died.
-    kernel_died = QtCore.Signal(object)
-
-    def call_handlers(self, since_last_heartbeat):
-        """ Reimplemented to emit signals instead of making callbacks.
-        """
-        self.kernel_died.emit(since_last_heartbeat)
-
-
 class QtKernelRestarterMixin(MetaQObjectHasTraits('NewBase', (HasTraits, SuperQObject), {})):
 
     _timer = None
@@ -171,12 +31,6 b" class QtKernelClientMixin(MetaQObjectHasTraits('NewBase', (HasTraits, SuperQObje"
     # Emitted when the kernel client has stopped listening.
     stopped_channels = QtCore.Signal()
 
-    # Use Qt-specific channel classes that emit signals.
-    iopub_channel_class = Type(QtIOPubChannelMixin)
-    shell_channel_class = Type(QtShellChannelMixin)
-    stdin_channel_class = Type(QtStdInChannelMixin)
-    hb_channel_class = Type(QtHBChannelMixin)
-
     #---------------------------------------------------------------------------
     # 'KernelClient' interface
     #---------------------------------------------------------------------------

IPython/terminal/console/completer.py

@@ -36,7 +36,7 b' class ZMQCompleter(IPCompleter):'
         
         # send completion request to kernel
         # Give the kernel up to 0.5s to respond
-        msg_id = self.client.shell_channel.complete(
+        msg_id = self.client.complete(
             code=line,
             cursor_pos=cursor_pos,
         )

IPython/terminal/console/interactiveshell.py

@@ -157,8 +157,8 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
         # flush stale replies, which could have been ignored, due to missed heartbeats
         while self.client.shell_channel.msg_ready():
             self.client.shell_channel.get_msg()
-        # shell_channel.execute takes 'hidden', which is the inverse of store_hist
-        msg_id = self.client.shell_channel.execute(cell, not store_history)
+        # execute takes 'hidden', which is the inverse of store_hist
+        msg_id = self.client.execute(cell, not store_history)
         
         # first thing is wait for any side effects (output, stdin, etc.)
         self._executing = True
@@ -399,7 +399,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
             # only send stdin reply if there *was not* another request
             # or execution finished while we were reading.
             if not (self.client.stdin_channel.msg_ready() or self.client.shell_channel.msg_ready()):
-                self.client.stdin_channel.input(raw_data)
+                self.client.input(raw_data)
 
     def mainloop(self, display_banner=False):
         while True:
@@ -414,7 +414,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
                 # handling seems rather unpredictable...
                 self.write("\nKeyboardInterrupt in interact()\n")
 
-        self.client.shell_channel.shutdown()
+        self.client.shutdown()
     
     def _banner1_default(self):
         return "IPython Console {version}\n".format(version=release.version)