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"""Base class for a kernel that talks to frontends over 0MQ."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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import sys
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import time
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import logging
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import uuid
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from datetime import datetime
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from signal import (
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signal, default_int_handler, SIGINT
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)
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import zmq
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from zmq.eventloop import ioloop
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from zmq.eventloop.zmqstream import ZMQStream
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from IPython.config.configurable import SingletonConfigurable
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from IPython.core.error import StdinNotImplementedError
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from IPython.core import release
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from IPython.utils import py3compat
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from IPython.utils.py3compat import unicode_type, string_types
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from IPython.utils.jsonutil import json_clean
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from IPython.utils.traitlets import (
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Any, Instance, Float, Dict, List, Set, Integer, Unicode, Bool,
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)
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from .session import Session
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class Kernel(SingletonConfigurable):
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#---------------------------------------------------------------------------
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# Kernel interface
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#---------------------------------------------------------------------------
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# attribute to override with a GUI
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eventloop = Any(None)
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def _eventloop_changed(self, name, old, new):
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"""schedule call to eventloop from IOLoop"""
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loop = ioloop.IOLoop.instance()
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loop.add_callback(self.enter_eventloop)
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session = Instance(Session)
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profile_dir = Instance('IPython.core.profiledir.ProfileDir')
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shell_streams = List()
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control_stream = Instance(ZMQStream)
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iopub_socket = Instance(zmq.Socket)
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stdin_socket = Instance(zmq.Socket)
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log = Instance(logging.Logger)
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# identities:
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int_id = Integer(-1)
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ident = Unicode()
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def _ident_default(self):
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return unicode_type(uuid.uuid4())
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# This should be overridden by wrapper kernels that implement any real
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# language.
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language_info = {}
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# any links that should go in the help menu
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help_links = List()
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# Private interface
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_darwin_app_nap = Bool(True, config=True,
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help="""Whether to use appnope for compatiblity with OS X App Nap.
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Only affects OS X >= 10.9.
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"""
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)
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# track associations with current request
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_allow_stdin = Bool(False)
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_parent_header = Dict()
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_parent_ident = Any(b'')
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# Time to sleep after flushing the stdout/err buffers in each execute
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# cycle. While this introduces a hard limit on the minimal latency of the
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# execute cycle, it helps prevent output synchronization problems for
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# clients.
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# Units are in seconds. The minimum zmq latency on local host is probably
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# ~150 microseconds, set this to 500us for now. We may need to increase it
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# a little if it's not enough after more interactive testing.
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_execute_sleep = Float(0.0005, config=True)
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# Frequency of the kernel's event loop.
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# Units are in seconds, kernel subclasses for GUI toolkits may need to
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# adapt to milliseconds.
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_poll_interval = Float(0.05, config=True)
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# If the shutdown was requested over the network, we leave here the
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# necessary reply message so it can be sent by our registered atexit
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# handler. This ensures that the reply is only sent to clients truly at
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# the end of our shutdown process (which happens after the underlying
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# IPython shell's own shutdown).
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_shutdown_message = None
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# This is a dict of port number that the kernel is listening on. It is set
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# by record_ports and used by connect_request.
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_recorded_ports = Dict()
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# set of aborted msg_ids
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aborted = Set()
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# Track execution count here. For IPython, we override this to use the
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# execution count we store in the shell.
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execution_count = 0
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def __init__(self, **kwargs):
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super(Kernel, self).__init__(**kwargs)
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# Build dict of handlers for message types
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msg_types = [ 'execute_request', 'complete_request',
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'inspect_request', 'history_request',
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'kernel_info_request',
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'connect_request', 'shutdown_request',
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'apply_request', 'is_complete_request',
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]
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self.shell_handlers = {}
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for msg_type in msg_types:
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self.shell_handlers[msg_type] = getattr(self, msg_type)
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control_msg_types = msg_types + [ 'clear_request', 'abort_request' ]
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self.control_handlers = {}
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for msg_type in control_msg_types:
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self.control_handlers[msg_type] = getattr(self, msg_type)
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def dispatch_control(self, msg):
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"""dispatch control requests"""
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idents,msg = self.session.feed_identities(msg, copy=False)
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try:
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msg = self.session.deserialize(msg, content=True, copy=False)
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except:
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self.log.error("Invalid Control Message", exc_info=True)
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return
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self.log.debug("Control received: %s", msg)
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# Set the parent message for side effects.
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self.set_parent(idents, msg)
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self._publish_status(u'busy')
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header = msg['header']
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msg_type = header['msg_type']
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handler = self.control_handlers.get(msg_type, None)
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if handler is None:
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self.log.error("UNKNOWN CONTROL MESSAGE TYPE: %r", msg_type)
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else:
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try:
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handler(self.control_stream, idents, msg)
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except Exception:
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self.log.error("Exception in control handler:", exc_info=True)
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sys.stdout.flush()
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sys.stderr.flush()
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self._publish_status(u'idle')
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def dispatch_shell(self, stream, msg):
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"""dispatch shell requests"""
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# flush control requests first
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if self.control_stream:
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self.control_stream.flush()
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idents,msg = self.session.feed_identities(msg, copy=False)
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try:
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msg = self.session.deserialize(msg, content=True, copy=False)
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except:
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self.log.error("Invalid Message", exc_info=True)
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return
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# Set the parent message for side effects.
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self.set_parent(idents, msg)
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self._publish_status(u'busy')
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header = msg['header']
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msg_id = header['msg_id']
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msg_type = msg['header']['msg_type']
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# Print some info about this message and leave a '--->' marker, so it's
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# easier to trace visually the message chain when debugging. Each
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# handler prints its message at the end.
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self.log.debug('\n*** MESSAGE TYPE:%s***', msg_type)
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self.log.debug(' Content: %s\n --->\n ', msg['content'])
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if msg_id in self.aborted:
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self.aborted.remove(msg_id)
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# is it safe to assume a msg_id will not be resubmitted?
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reply_type = msg_type.split('_')[0] + '_reply'
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status = {'status' : 'aborted'}
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md = {'engine' : self.ident}
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md.update(status)
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self.session.send(stream, reply_type, metadata=md,
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content=status, parent=msg, ident=idents)
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return
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handler = self.shell_handlers.get(msg_type, None)
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if handler is None:
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self.log.error("UNKNOWN MESSAGE TYPE: %r", msg_type)
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else:
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# ensure default_int_handler during handler call
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sig = signal(SIGINT, default_int_handler)
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self.log.debug("%s: %s", msg_type, msg)
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try:
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handler(stream, idents, msg)
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except Exception:
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self.log.error("Exception in message handler:", exc_info=True)
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finally:
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signal(SIGINT, sig)
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sys.stdout.flush()
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sys.stderr.flush()
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self._publish_status(u'idle')
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def enter_eventloop(self):
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"""enter eventloop"""
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self.log.info("entering eventloop %s", self.eventloop)
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for stream in self.shell_streams:
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# flush any pending replies,
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# which may be skipped by entering the eventloop
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stream.flush(zmq.POLLOUT)
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# restore default_int_handler
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signal(SIGINT, default_int_handler)
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while self.eventloop is not None:
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try:
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self.eventloop(self)
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except KeyboardInterrupt:
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# Ctrl-C shouldn't crash the kernel
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self.log.error("KeyboardInterrupt caught in kernel")
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continue
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else:
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# eventloop exited cleanly, this means we should stop (right?)
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self.eventloop = None
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break
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self.log.info("exiting eventloop")
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def start(self):
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"""register dispatchers for streams"""
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if self.control_stream:
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self.control_stream.on_recv(self.dispatch_control, copy=False)
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def make_dispatcher(stream):
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def dispatcher(msg):
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return self.dispatch_shell(stream, msg)
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return dispatcher
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for s in self.shell_streams:
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s.on_recv(make_dispatcher(s), copy=False)
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# publish idle status
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self._publish_status('starting')
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def do_one_iteration(self):
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"""step eventloop just once"""
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if self.control_stream:
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self.control_stream.flush()
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for stream in self.shell_streams:
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# handle at most one request per iteration
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stream.flush(zmq.POLLIN, 1)
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stream.flush(zmq.POLLOUT)
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def record_ports(self, ports):
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"""Record the ports that this kernel is using.
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The creator of the Kernel instance must call this methods if they
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want the :meth:`connect_request` method to return the port numbers.
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"""
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self._recorded_ports = ports
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#---------------------------------------------------------------------------
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# Kernel request handlers
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#---------------------------------------------------------------------------
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def _make_metadata(self, other=None):
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"""init metadata dict, for execute/apply_reply"""
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new_md = {
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'dependencies_met' : True,
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'engine' : self.ident,
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'started': datetime.now(),
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}
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if other:
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new_md.update(other)
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return new_md
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def _publish_execute_input(self, code, parent, execution_count):
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"""Publish the code request on the iopub stream."""
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self.session.send(self.iopub_socket, u'execute_input',
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{u'code':code, u'execution_count': execution_count},
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parent=parent, ident=self._topic('execute_input')
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)
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def _publish_status(self, status, parent=None):
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"""send status (busy/idle) on IOPub"""
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self.session.send(self.iopub_socket,
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u'status',
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{u'execution_state': status},
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parent=parent or self._parent_header,
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ident=self._topic('status'),
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)
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def set_parent(self, ident, parent):
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"""Set the current parent_header
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Side effects (IOPub messages) and replies are associated with
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the request that caused them via the parent_header.
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The parent identity is used to route input_request messages
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on the stdin channel.
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"""
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self._parent_ident = ident
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self._parent_header = parent
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def send_response(self, stream, msg_or_type, content=None, ident=None,
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buffers=None, track=False, header=None, metadata=None):
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"""Send a response to the message we're currently processing.
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This accepts all the parameters of :meth:`IPython.kernel.zmq.session.Session.send`
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except ``parent``.
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This relies on :meth:`set_parent` having been called for the current
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message.
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"""
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return self.session.send(stream, msg_or_type, content, self._parent_header,
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ident, buffers, track, header, metadata)
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def execute_request(self, stream, ident, parent):
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"""handle an execute_request"""
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try:
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content = parent[u'content']
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code = py3compat.cast_unicode_py2(content[u'code'])
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silent = content[u'silent']
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store_history = content.get(u'store_history', not silent)
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user_expressions = content.get('user_expressions', {})
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allow_stdin = content.get('allow_stdin', False)
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except:
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self.log.error("Got bad msg: ")
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self.log.error("%s", parent)
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return
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stop_on_error = content.get('stop_on_error', True)
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md = self._make_metadata(parent['metadata'])
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# Re-broadcast our input for the benefit of listening clients, and
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# start computing output
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if not silent:
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self.execution_count += 1
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self._publish_execute_input(code, parent, self.execution_count)
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reply_content = self.do_execute(code, silent, store_history,
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user_expressions, allow_stdin)
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# Flush output before sending the reply.
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sys.stdout.flush()
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sys.stderr.flush()
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# FIXME: on rare occasions, the flush doesn't seem to make it to the
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# clients... This seems to mitigate the problem, but we definitely need
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# to better understand what's going on.
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if self._execute_sleep:
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time.sleep(self._execute_sleep)
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# Send the reply.
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reply_content = json_clean(reply_content)
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md['status'] = reply_content['status']
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if reply_content['status'] == 'error' and \
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reply_content['ename'] == 'UnmetDependency':
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md['dependencies_met'] = False
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reply_msg = self.session.send(stream, u'execute_reply',
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reply_content, parent, metadata=md,
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ident=ident)
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self.log.debug("%s", reply_msg)
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if not silent and reply_msg['content']['status'] == u'error' and stop_on_error:
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self._abort_queues()
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def do_execute(self, code, silent, store_history=True,
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user_expressions=None, allow_stdin=False):
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"""Execute user code. Must be overridden by subclasses.
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"""
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raise NotImplementedError
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def complete_request(self, stream, ident, parent):
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content = parent['content']
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code = content['code']
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cursor_pos = content['cursor_pos']
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matches = self.do_complete(code, cursor_pos)
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matches = json_clean(matches)
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completion_msg = self.session.send(stream, 'complete_reply',
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matches, parent, ident)
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self.log.debug("%s", completion_msg)
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def do_complete(self, code, cursor_pos):
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"""Override in subclasses to find completions.
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"""
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return {'matches' : [],
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'cursor_end' : cursor_pos,
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'cursor_start' : cursor_pos,
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'metadata' : {},
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'status' : 'ok'}
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def inspect_request(self, stream, ident, parent):
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content = parent['content']
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reply_content = self.do_inspect(content['code'], content['cursor_pos'],
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content.get('detail_level', 0))
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# Before we send this object over, we scrub it for JSON usage
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reply_content = json_clean(reply_content)
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msg = self.session.send(stream, 'inspect_reply',
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reply_content, parent, ident)
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self.log.debug("%s", msg)
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def do_inspect(self, code, cursor_pos, detail_level=0):
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"""Override in subclasses to allow introspection.
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"""
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return {'status': 'ok', 'data':{}, 'metadata':{}, 'found':False}
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def history_request(self, stream, ident, parent):
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content = parent['content']
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reply_content = self.do_history(**content)
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reply_content = json_clean(reply_content)
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msg = self.session.send(stream, 'history_reply',
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reply_content, parent, ident)
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self.log.debug("%s", msg)
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|
def do_history(self, hist_access_type, output, raw, session=None, start=None,
|
|
|
stop=None, n=None, pattern=None, unique=False):
|
|
|
"""Override in subclasses to access history.
|
|
|
"""
|
|
|
return {'history': []}
|
|
|
|
|
|
def connect_request(self, stream, ident, parent):
|
|
|
if self._recorded_ports is not None:
|
|
|
content = self._recorded_ports.copy()
|
|
|
else:
|
|
|
content = {}
|
|
|
msg = self.session.send(stream, 'connect_reply',
|
|
|
content, parent, ident)
|
|
|
self.log.debug("%s", msg)
|
|
|
|
|
|
@property
|
|
|
def kernel_info(self):
|
|
|
return {
|
|
|
'protocol_version': release.kernel_protocol_version,
|
|
|
'implementation': self.implementation,
|
|
|
'implementation_version': self.implementation_version,
|
|
|
'language_info': self.language_info,
|
|
|
'banner': self.banner,
|
|
|
'help_links': self.help_links,
|
|
|
}
|
|
|
|
|
|
def kernel_info_request(self, stream, ident, parent):
|
|
|
msg = self.session.send(stream, 'kernel_info_reply',
|
|
|
self.kernel_info, parent, ident)
|
|
|
self.log.debug("%s", msg)
|
|
|
|
|
|
def shutdown_request(self, stream, ident, parent):
|
|
|
content = self.do_shutdown(parent['content']['restart'])
|
|
|
self.session.send(stream, u'shutdown_reply', content, parent, ident=ident)
|
|
|
# same content, but different msg_id for broadcasting on IOPub
|
|
|
self._shutdown_message = self.session.msg(u'shutdown_reply',
|
|
|
content, parent
|
|
|
)
|
|
|
|
|
|
self._at_shutdown()
|
|
|
# call sys.exit after a short delay
|
|
|
loop = ioloop.IOLoop.instance()
|
|
|
loop.add_timeout(time.time()+0.1, loop.stop)
|
|
|
|
|
|
def do_shutdown(self, restart):
|
|
|
"""Override in subclasses to do things when the frontend shuts down the
|
|
|
kernel.
|
|
|
"""
|
|
|
return {'status': 'ok', 'restart': restart}
|
|
|
|
|
|
def is_complete_request(self, stream, ident, parent):
|
|
|
content = parent['content']
|
|
|
code = content['code']
|
|
|
|
|
|
reply_content = self.do_is_complete(code)
|
|
|
reply_content = json_clean(reply_content)
|
|
|
reply_msg = self.session.send(stream, 'is_complete_reply',
|
|
|
reply_content, parent, ident)
|
|
|
self.log.debug("%s", reply_msg)
|
|
|
|
|
|
def do_is_complete(self, code):
|
|
|
"""Override in subclasses to find completions.
|
|
|
"""
|
|
|
return {'status' : 'unknown',
|
|
|
}
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Engine methods
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def apply_request(self, stream, ident, parent):
|
|
|
try:
|
|
|
content = parent[u'content']
|
|
|
bufs = parent[u'buffers']
|
|
|
msg_id = parent['header']['msg_id']
|
|
|
except:
|
|
|
self.log.error("Got bad msg: %s", parent, exc_info=True)
|
|
|
return
|
|
|
|
|
|
md = self._make_metadata(parent['metadata'])
|
|
|
|
|
|
reply_content, result_buf = self.do_apply(content, bufs, msg_id, md)
|
|
|
|
|
|
# put 'ok'/'error' status in header, for scheduler introspection:
|
|
|
md['status'] = reply_content['status']
|
|
|
|
|
|
# flush i/o
|
|
|
sys.stdout.flush()
|
|
|
sys.stderr.flush()
|
|
|
|
|
|
self.session.send(stream, u'apply_reply', reply_content,
|
|
|
parent=parent, ident=ident,buffers=result_buf, metadata=md)
|
|
|
|
|
|
def do_apply(self, content, bufs, msg_id, reply_metadata):
|
|
|
"""Override in subclasses to support the IPython parallel framework.
|
|
|
"""
|
|
|
raise NotImplementedError
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Control messages
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def abort_request(self, stream, ident, parent):
|
|
|
"""abort a specific msg by id"""
|
|
|
msg_ids = parent['content'].get('msg_ids', None)
|
|
|
if isinstance(msg_ids, string_types):
|
|
|
msg_ids = [msg_ids]
|
|
|
if not msg_ids:
|
|
|
self._abort_queues()
|
|
|
for mid in msg_ids:
|
|
|
self.aborted.add(str(mid))
|
|
|
|
|
|
content = dict(status='ok')
|
|
|
reply_msg = self.session.send(stream, 'abort_reply', content=content,
|
|
|
parent=parent, ident=ident)
|
|
|
self.log.debug("%s", reply_msg)
|
|
|
|
|
|
def clear_request(self, stream, idents, parent):
|
|
|
"""Clear our namespace."""
|
|
|
content = self.do_clear()
|
|
|
self.session.send(stream, 'clear_reply', ident=idents, parent=parent,
|
|
|
content = content)
|
|
|
|
|
|
def do_clear(self):
|
|
|
"""Override in subclasses to clear the namespace
|
|
|
|
|
|
This is only required for IPython.parallel.
|
|
|
"""
|
|
|
raise NotImplementedError
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _topic(self, topic):
|
|
|
"""prefixed topic for IOPub messages"""
|
|
|
if self.int_id >= 0:
|
|
|
base = "engine.%i" % self.int_id
|
|
|
else:
|
|
|
base = "kernel.%s" % self.ident
|
|
|
|
|
|
return py3compat.cast_bytes("%s.%s" % (base, topic))
|
|
|
|
|
|
def _abort_queues(self):
|
|
|
for stream in self.shell_streams:
|
|
|
if stream:
|
|
|
self._abort_queue(stream)
|
|
|
|
|
|
def _abort_queue(self, stream):
|
|
|
poller = zmq.Poller()
|
|
|
poller.register(stream.socket, zmq.POLLIN)
|
|
|
while True:
|
|
|
idents,msg = self.session.recv(stream, zmq.NOBLOCK, content=True)
|
|
|
if msg is None:
|
|
|
return
|
|
|
|
|
|
self.log.info("Aborting:")
|
|
|
self.log.info("%s", msg)
|
|
|
msg_type = msg['header']['msg_type']
|
|
|
reply_type = msg_type.split('_')[0] + '_reply'
|
|
|
|
|
|
status = {'status' : 'aborted'}
|
|
|
md = {'engine' : self.ident}
|
|
|
md.update(status)
|
|
|
reply_msg = self.session.send(stream, reply_type, metadata=md,
|
|
|
content=status, parent=msg, ident=idents)
|
|
|
self.log.debug("%s", reply_msg)
|
|
|
# We need to wait a bit for requests to come in. This can probably
|
|
|
# be set shorter for true asynchronous clients.
|
|
|
poller.poll(50)
|
|
|
|
|
|
|
|
|
def _no_raw_input(self):
|
|
|
"""Raise StdinNotImplentedError if active frontend doesn't support
|
|
|
stdin."""
|
|
|
raise StdinNotImplementedError("raw_input was called, but this "
|
|
|
"frontend does not support stdin.")
|
|
|
|
|
|
def getpass(self, prompt=''):
|
|
|
"""Forward getpass to frontends
|
|
|
|
|
|
Raises
|
|
|
------
|
|
|
StdinNotImplentedError if active frontend doesn't support stdin.
|
|
|
"""
|
|
|
if not self._allow_stdin:
|
|
|
raise StdinNotImplementedError(
|
|
|
"getpass was called, but this frontend does not support input requests."
|
|
|
)
|
|
|
return self._input_request(prompt,
|
|
|
self._parent_ident,
|
|
|
self._parent_header,
|
|
|
password=True,
|
|
|
)
|
|
|
|
|
|
def raw_input(self, prompt=''):
|
|
|
"""Forward raw_input to frontends
|
|
|
|
|
|
Raises
|
|
|
------
|
|
|
StdinNotImplentedError if active frontend doesn't support stdin.
|
|
|
"""
|
|
|
if not self._allow_stdin:
|
|
|
raise StdinNotImplementedError(
|
|
|
"raw_input was called, but this frontend does not support input requests."
|
|
|
)
|
|
|
return self._input_request(prompt,
|
|
|
self._parent_ident,
|
|
|
self._parent_header,
|
|
|
password=False,
|
|
|
)
|
|
|
|
|
|
def _input_request(self, prompt, ident, parent, password=False):
|
|
|
# Flush output before making the request.
|
|
|
sys.stderr.flush()
|
|
|
sys.stdout.flush()
|
|
|
# flush the stdin socket, to purge stale replies
|
|
|
while True:
|
|
|
try:
|
|
|
self.stdin_socket.recv_multipart(zmq.NOBLOCK)
|
|
|
except zmq.ZMQError as e:
|
|
|
if e.errno == zmq.EAGAIN:
|
|
|
break
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
# Send the input request.
|
|
|
content = json_clean(dict(prompt=prompt, password=password))
|
|
|
self.session.send(self.stdin_socket, u'input_request', content, parent,
|
|
|
ident=ident)
|
|
|
|
|
|
# Await a response.
|
|
|
while True:
|
|
|
try:
|
|
|
ident, reply = self.session.recv(self.stdin_socket, 0)
|
|
|
except Exception:
|
|
|
self.log.warn("Invalid Message:", exc_info=True)
|
|
|
except KeyboardInterrupt:
|
|
|
# re-raise KeyboardInterrupt, to truncate traceback
|
|
|
raise KeyboardInterrupt
|
|
|
else:
|
|
|
break
|
|
|
try:
|
|
|
value = py3compat.unicode_to_str(reply['content']['value'])
|
|
|
except:
|
|
|
self.log.error("Bad input_reply: %s", parent)
|
|
|
value = ''
|
|
|
if value == '\x04':
|
|
|
# EOF
|
|
|
raise EOFError
|
|
|
return value
|
|
|
|
|
|
def _at_shutdown(self):
|
|
|
"""Actions taken at shutdown by the kernel, called by python's atexit.
|
|
|
"""
|
|
|
# io.rprint("Kernel at_shutdown") # dbg
|
|
|
if self._shutdown_message is not None:
|
|
|
self.session.send(self.iopub_socket, self._shutdown_message, ident=self._topic('shutdown'))
|
|
|
self.log.debug("%s", self._shutdown_message)
|
|
|
[ s.flush(zmq.POLLOUT) for s in self.shell_streams ]
|
|
|
|
