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"""Base classes to manage a Client's interaction with a running kernel
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2013 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import absolute_import
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# Standard library imports
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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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# Local imports
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from .channelsabc import (
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ShellChannelABC, IOPubChannelABC,
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HBChannelABC, StdInChannelABC,
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)
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from IPython.utils.py3compat import string_types, iteritems
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#-----------------------------------------------------------------------------
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# Constants and exceptions
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#-----------------------------------------------------------------------------
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class InvalidPortNumber(Exception):
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pass
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#-----------------------------------------------------------------------------
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# Utility functions
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#-----------------------------------------------------------------------------
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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_list(lst):
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"""Validate that the input is a list of strings.
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Raises ValueError if not."""
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if not isinstance(lst, list):
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raise ValueError('input %r must be a list' % lst)
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for x in lst:
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if not isinstance(x, string_types):
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raise ValueError('element %r in list must be a string' % x)
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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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#-----------------------------------------------------------------------------
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# ZMQ Socket Channel classes
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#-----------------------------------------------------------------------------
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class ZMQSocketChannel(Thread):
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"""The base class for the channels that use ZMQ sockets."""
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context = None
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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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_address = None
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_exiting = False
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proxy_methods = []
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def __init__(self, context, session, address):
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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(ZMQSocketChannel, self).__init__()
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self.daemon = True
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self.context = context
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self.session = session
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if isinstance(address, tuple):
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if address[1] == 0:
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message = 'The port number for a channel cannot be 0.'
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raise InvalidPortNumber(message)
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address = "tcp://%s:%i" % address
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self._address = address
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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 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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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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self.call_handlers(self.session.unserialize(smsg))
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class ShellChannel(ZMQSocketChannel):
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"""The shell channel for issuing request/replies to the kernel."""
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command_queue = None
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# flag for whether execute requests should be allowed to call raw_input:
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allow_stdin = True
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proxy_methods = [
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'execute',
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'complete',
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'object_info',
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'history',
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'kernel_info',
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'shutdown',
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]
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def __init__(self, context, session, address):
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super(ShellChannel, self).__init__(context, session, address)
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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.socket = self.context.socket(zmq.DEALER)
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self.socket.setsockopt(zmq.IDENTITY, self.session.bsession)
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self.socket.connect(self.address)
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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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"""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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raise NotImplementedError('call_handlers must be defined in a subclass.')
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def execute(self, code, silent=False, store_history=True,
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user_variables=None, user_expressions=None, allow_stdin=None):
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"""Execute code in the kernel.
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Parameters
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----------
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code : str
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A string of Python code.
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silent : bool, optional (default False)
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If set, the kernel will execute the code as quietly possible, and
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will force store_history to be False.
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store_history : bool, optional (default True)
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If set, the kernel will store command history. This is forced
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to be False if silent is True.
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user_variables : list, optional
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A list of variable names to pull from the user's namespace. They
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will come back as a dict with these names as keys and their
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:func:`repr` as values.
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user_expressions : dict, optional
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A dict mapping names to expressions to be evaluated in the user's
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dict. The expression values are returned as strings formatted using
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:func:`repr`.
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allow_stdin : bool, optional (default self.allow_stdin)
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Flag for whether the kernel can send stdin requests to frontends.
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Some frontends (e.g. the Notebook) do not support stdin requests.
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If raw_input is called from code executed from such a frontend, a
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StdinNotImplementedError will be raised.
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Returns
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-------
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The msg_id of the message sent.
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"""
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if user_variables is None:
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user_variables = []
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if user_expressions is None:
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user_expressions = {}
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if allow_stdin is None:
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allow_stdin = self.allow_stdin
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# Don't waste network traffic if inputs are invalid
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if not isinstance(code, string_types):
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raise ValueError('code %r must be a string' % code)
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validate_string_list(user_variables)
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validate_string_dict(user_expressions)
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# Create class for content/msg creation. Related to, but possibly
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# not in Session.
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content = dict(code=code, silent=silent, store_history=store_history,
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user_variables=user_variables,
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user_expressions=user_expressions,
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allow_stdin=allow_stdin,
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)
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msg = self.session.msg('execute_request', content)
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self._queue_send(msg)
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return msg['header']['msg_id']
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def complete(self, text, line, cursor_pos, block=None):
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"""Tab complete text in the kernel's namespace.
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Parameters
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----------
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text : str
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The text to complete.
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line : str
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The full line of text that is the surrounding context for the
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text to complete.
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cursor_pos : int
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The position of the cursor in the line where the completion was
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requested.
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block : str, optional
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The full block of code in which the completion is being requested.
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Returns
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-------
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The msg_id of the message sent.
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"""
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content = dict(text=text, line=line, block=block, cursor_pos=cursor_pos)
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msg = self.session.msg('complete_request', content)
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self._queue_send(msg)
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return msg['header']['msg_id']
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def object_info(self, oname, detail_level=0):
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"""Get metadata information about an object in the kernel's namespace.
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Parameters
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----------
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oname : str
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A string specifying the object name.
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detail_level : int, optional
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The level of detail for the introspection (0-2)
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Returns
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-------
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The msg_id of the message sent.
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"""
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content = dict(oname=oname, detail_level=detail_level)
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msg = self.session.msg('object_info_request', content)
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self._queue_send(msg)
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return msg['header']['msg_id']
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def history(self, raw=True, output=False, hist_access_type='range', **kwargs):
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"""Get entries from the kernel's history list.
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Parameters
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----------
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raw : bool
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If True, return the raw input.
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output : bool
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If True, then return the output as well.
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hist_access_type : str
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'range' (fill in session, start and stop params), 'tail' (fill in n)
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or 'search' (fill in pattern param).
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session : int
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For a range request, the session from which to get lines. Session
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numbers are positive integers; negative ones count back from the
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current session.
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start : int
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The first line number of a history range.
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stop : int
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The final (excluded) line number of a history range.
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n : int
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The number of lines of history to get for a tail request.
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pattern : str
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The glob-syntax pattern for a search request.
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Returns
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-------
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The msg_id of the message sent.
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"""
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content = dict(raw=raw, output=output, hist_access_type=hist_access_type,
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**kwargs)
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msg = self.session.msg('history_request', content)
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self._queue_send(msg)
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return msg['header']['msg_id']
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def kernel_info(self):
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"""Request kernel info."""
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msg = self.session.msg('kernel_info_request')
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self._queue_send(msg)
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return msg['header']['msg_id']
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def shutdown(self, restart=False):
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"""Request an immediate kernel shutdown.
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Upon receipt of the (empty) reply, client code can safely assume that
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the kernel has shut down and it's safe to forcefully terminate it if
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it's still alive.
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The kernel will send the reply via a function registered with Python's
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atexit module, ensuring it's truly done as the kernel is done with all
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normal operation.
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"""
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# Send quit message to kernel. Once we implement kernel-side setattr,
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# this should probably be done that way, but for now this will do.
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msg = self.session.msg('shutdown_request', {'restart':restart})
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self._queue_send(msg)
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return msg['header']['msg_id']
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class IOPubChannel(ZMQSocketChannel):
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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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def __init__(self, context, session, address):
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super(IOPubChannel, self).__init__(context, session, address)
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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.socket = self.context.socket(zmq.SUB)
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self.socket.setsockopt(zmq.SUBSCRIBE,b'')
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self.socket.setsockopt(zmq.IDENTITY, self.session.bsession)
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self.socket.connect(self.address)
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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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|
"""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.
|
|
|
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.
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"""
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|
raise NotImplementedError('call_handlers must be defined in a subclass.')
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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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|
|
|
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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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|
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|
This method is thread safe.
|
|
|
|
|
|
Parameters
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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):
|
|
|
"""Callback for :method:`self.flush`."""
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|
|
self.stream.flush()
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|
|
self._flushed = True
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|
|
|
|
|
|
|
|
class StdInChannel(ZMQSocketChannel):
|
|
|
"""The stdin channel to handle raw_input requests that the kernel makes."""
|
|
|
|
|
|
msg_queue = None
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|
|
proxy_methods = ['input']
|
|
|
|
|
|
def __init__(self, context, session, address):
|
|
|
super(StdInChannel, self).__init__(context, session, address)
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|
|
self.ioloop = ioloop.IOLoop()
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|
|
|
|
|
def run(self):
|
|
|
"""The thread's main activity. Call start() instead."""
|
|
|
self.socket = self.context.socket(zmq.DEALER)
|
|
|
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.poller = zmq.Poller()
|
|
|
|
|
|
def _create_socket(self):
|
|
|
if self.socket is not None:
|
|
|
# close previous socket, before opening a new one
|
|
|
self.poller.unregister(self.socket)
|
|
|
self.socket.close()
|
|
|
self.socket = self.context.socket(zmq.REQ)
|
|
|
self.socket.setsockopt(zmq.LINGER, 0)
|
|
|
self.socket.connect(self.address)
|
|
|
|
|
|
self.poller.register(self.socket, zmq.POLLIN)
|
|
|
|
|
|
def _poll(self, start_time):
|
|
|
"""poll for heartbeat replies until we reach self.time_to_dead.
|
|
|
|
|
|
Ignores interrupts, and returns the result of poll(), which
|
|
|
will be an empty list if no messages arrived before the timeout,
|
|
|
or the event tuple if there is a message to receive.
|
|
|
"""
|
|
|
|
|
|
until_dead = self.time_to_dead - (time.time() - start_time)
|
|
|
# ensure poll at least once
|
|
|
until_dead = max(until_dead, 1e-3)
|
|
|
events = []
|
|
|
while True:
|
|
|
try:
|
|
|
events = self.poller.poll(1000 * until_dead)
|
|
|
except ZMQError as e:
|
|
|
if e.errno == errno.EINTR:
|
|
|
# ignore interrupts during heartbeat
|
|
|
# this may never actually happen
|
|
|
until_dead = self.time_to_dead - (time.time() - start_time)
|
|
|
until_dead = max(until_dead, 1e-3)
|
|
|
pass
|
|
|
else:
|
|
|
raise
|
|
|
except Exception:
|
|
|
if self._exiting:
|
|
|
break
|
|
|
else:
|
|
|
raise
|
|
|
else:
|
|
|
break
|
|
|
return events
|
|
|
|
|
|
def run(self):
|
|
|
"""The thread's main activity. Call start() instead."""
|
|
|
self._create_socket()
|
|
|
self._running = True
|
|
|
self._beating = True
|
|
|
|
|
|
while self._running:
|
|
|
if self._pause:
|
|
|
# just sleep, and skip the rest of the loop
|
|
|
time.sleep(self.time_to_dead)
|
|
|
continue
|
|
|
|
|
|
since_last_heartbeat = 0.0
|
|
|
# io.rprint('Ping from HB channel') # dbg
|
|
|
# no need to catch EFSM here, because the previous event was
|
|
|
# either a recv or connect, which cannot be followed by EFSM
|
|
|
self.socket.send(b'ping')
|
|
|
request_time = time.time()
|
|
|
ready = self._poll(request_time)
|
|
|
if ready:
|
|
|
self._beating = True
|
|
|
# the poll above guarantees we have something to recv
|
|
|
self.socket.recv()
|
|
|
# sleep the remainder of the cycle
|
|
|
remainder = self.time_to_dead - (time.time() - request_time)
|
|
|
if remainder > 0:
|
|
|
time.sleep(remainder)
|
|
|
continue
|
|
|
else:
|
|
|
# nothing was received within the time limit, signal heart failure
|
|
|
self._beating = False
|
|
|
since_last_heartbeat = time.time() - request_time
|
|
|
self.call_handlers(since_last_heartbeat)
|
|
|
# and close/reopen the socket, because the REQ/REP cycle has been broken
|
|
|
self._create_socket()
|
|
|
continue
|
|
|
|
|
|
def pause(self):
|
|
|
"""Pause the heartbeat."""
|
|
|
self._pause = True
|
|
|
|
|
|
def unpause(self):
|
|
|
"""Unpause the heartbeat."""
|
|
|
self._pause = False
|
|
|
|
|
|
def is_beating(self):
|
|
|
"""Is the heartbeat running and responsive (and not paused)."""
|
|
|
if self.is_alive() and not self._pause and self._beating:
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
|
|
|
def stop(self):
|
|
|
"""Stop the channel's event loop and join its thread."""
|
|
|
self._running = False
|
|
|
super(HBChannel, self).stop()
|
|
|
|
|
|
def call_handlers(self, since_last_heartbeat):
|
|
|
"""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.')
|
|
|
|
|
|
|
|
|
#---------------------------------------------------------------------#-----------------------------------------------------------------------------
|
|
|
# ABC Registration
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
ShellChannelABC.register(ShellChannel)
|
|
|
IOPubChannelABC.register(IOPubChannel)
|
|
|
HBChannelABC.register(HBChannel)
|
|
|
StdInChannelABC.register(StdInChannel)
|
|
|
|
