You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
925 lines
32 KiB
925 lines
32 KiB
4 years ago
|
"""Base class for a kernel that talks to frontends over 0MQ."""
|
||
|
|
|
||
|
|
# Copyright (c) IPython Development Team.
|
||
|
|
# Distributed under the terms of the Modified BSD License.
|
||
|
|
|
||
|
|
from __future__ import print_function
|
||
|
|
|
||
|
|
from datetime import datetime
|
||
|
|
from functools import partial
|
||
|
|
import itertools
|
||
|
|
import logging
|
||
|
|
from signal import signal, default_int_handler, SIGINT
|
||
|
|
import sys
|
||
|
|
import time
|
||
|
|
import uuid
|
||
|
|
|
||
|
|
try:
|
||
|
|
# jupyter_client >= 5, use tz-aware now
|
||
|
|
from jupyter_client.session import utcnow as now
|
||
|
|
except ImportError:
|
||
|
|
# jupyter_client < 5, use local now()
|
||
|
|
now = datetime.now
|
||
|
|
|
||
|
|
from tornado import ioloop
|
||
|
|
from tornado import gen
|
||
|
|
from tornado.queues import PriorityQueue, QueueEmpty
|
||
|
|
import zmq
|
||
|
|
from zmq.eventloop.zmqstream import ZMQStream
|
||
|
|
|
||
|
|
from traitlets.config.configurable import SingletonConfigurable
|
||
|
|
from IPython.core.error import StdinNotImplementedError
|
||
|
|
from ipython_genutils import py3compat
|
||
|
|
from ipython_genutils.py3compat import unicode_type, string_types
|
||
|
|
from ipykernel.jsonutil import json_clean
|
||
|
|
from traitlets import (
|
||
|
|
Any, Instance, Float, Dict, List, Set, Integer, Unicode, Bool,
|
||
|
|
observe, default
|
||
|
|
)
|
||
|
|
|
||
|
|
from jupyter_client.session import Session
|
||
|
|
|
||
|
|
from ._version import kernel_protocol_version
|
||
|
|
|
||
|
|
CONTROL_PRIORITY = 1
|
||
|
|
SHELL_PRIORITY = 10
|
||
|
|
ABORT_PRIORITY = 20
|
||
|
|
|
||
|
|
|
||
|
|
class Kernel(SingletonConfigurable):
|
||
|
|
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
# Kernel interface
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
|
||
|
|
# attribute to override with a GUI
|
||
|
|
eventloop = Any(None)
|
||
|
|
|
||
|
|
@observe('eventloop')
|
||
|
|
def _update_eventloop(self, change):
|
||
|
|
"""schedule call to eventloop from IOLoop"""
|
||
|
|
loop = ioloop.IOLoop.current()
|
||
|
|
if change.new is not None:
|
||
|
|
loop.add_callback(self.enter_eventloop)
|
||
|
|
|
||
|
|
session = Instance(Session, allow_none=True)
|
||
|
|
profile_dir = Instance('IPython.core.profiledir.ProfileDir', allow_none=True)
|
||
|
|
shell_streams = List()
|
||
|
|
control_stream = Instance(ZMQStream, allow_none=True)
|
||
|
|
iopub_socket = Any()
|
||
|
|
iopub_thread = Any()
|
||
|
|
stdin_socket = Any()
|
||
|
|
log = Instance(logging.Logger, allow_none=True)
|
||
|
|
|
||
|
|
# identities:
|
||
|
|
int_id = Integer(-1)
|
||
|
|
ident = Unicode()
|
||
|
|
|
||
|
|
@default('ident')
|
||
|
|
def _default_ident(self):
|
||
|
|
return unicode_type(uuid.uuid4())
|
||
|
|
|
||
|
|
# This should be overridden by wrapper kernels that implement any real
|
||
|
|
# language.
|
||
|
|
language_info = {}
|
||
|
|
|
||
|
|
# any links that should go in the help menu
|
||
|
|
help_links = List()
|
||
|
|
|
||
|
|
# Private interface
|
||
|
|
|
||
|
|
_darwin_app_nap = Bool(True,
|
||
|
|
help="""Whether to use appnope for compatibility with OS X App Nap.
|
||
|
|
|
||
|
|
Only affects OS X >= 10.9.
|
||
|
|
"""
|
||
|
|
).tag(config=True)
|
||
|
|
|
||
|
|
# track associations with current request
|
||
|
|
_allow_stdin = Bool(False)
|
||
|
|
_parent_header = Dict()
|
||
|
|
_parent_ident = Any(b'')
|
||
|
|
# Time to sleep after flushing the stdout/err buffers in each execute
|
||
|
|
# cycle. While this introduces a hard limit on the minimal latency of the
|
||
|
|
# execute cycle, it helps prevent output synchronization problems for
|
||
|
|
# clients.
|
||
|
|
# Units are in seconds. The minimum zmq latency on local host is probably
|
||
|
|
# ~150 microseconds, set this to 500us for now. We may need to increase it
|
||
|
|
# a little if it's not enough after more interactive testing.
|
||
|
|
_execute_sleep = Float(0.0005).tag(config=True)
|
||
|
|
|
||
|
|
# Frequency of the kernel's event loop.
|
||
|
|
# Units are in seconds, kernel subclasses for GUI toolkits may need to
|
||
|
|
# adapt to milliseconds.
|
||
|
|
_poll_interval = Float(0.01).tag(config=True)
|
||
|
|
|
||
|
|
stop_on_error_timeout = Float(
|
||
|
|
0.1,
|
||
|
|
config=True,
|
||
|
|
help="""time (in seconds) to wait for messages to arrive
|
||
|
|
when aborting queued requests after an error.
|
||
|
|
|
||
|
|
Requests that arrive within this window after an error
|
||
|
|
will be cancelled.
|
||
|
|
|
||
|
|
Increase in the event of unusually slow network
|
||
|
|
causing significant delays,
|
||
|
|
which can manifest as e.g. "Run all" in a notebook
|
||
|
|
aborting some, but not all, messages after an error.
|
||
|
|
"""
|
||
|
|
)
|
||
|
|
|
||
|
|
# If the shutdown was requested over the network, we leave here the
|
||
|
|
# necessary reply message so it can be sent by our registered atexit
|
||
|
|
# handler. This ensures that the reply is only sent to clients truly at
|
||
|
|
# the end of our shutdown process (which happens after the underlying
|
||
|
|
# IPython shell's own shutdown).
|
||
|
|
_shutdown_message = None
|
||
|
|
|
||
|
|
# This is a dict of port number that the kernel is listening on. It is set
|
||
|
|
# by record_ports and used by connect_request.
|
||
|
|
_recorded_ports = Dict()
|
||
|
|
|
||
|
|
# set of aborted msg_ids
|
||
|
|
aborted = Set()
|
||
|
|
|
||
|
|
# Track execution count here. For IPython, we override this to use the
|
||
|
|
# execution count we store in the shell.
|
||
|
|
execution_count = 0
|
||
|
|
|
||
|
|
msg_types = [
|
||
|
|
'execute_request', 'complete_request',
|
||
|
|
'inspect_request', 'history_request',
|
||
|
|
'comm_info_request', 'kernel_info_request',
|
||
|
|
'connect_request', 'shutdown_request',
|
||
|
|
'is_complete_request',
|
||
|
|
# deprecated:
|
||
|
|
'apply_request',
|
||
|
|
]
|
||
|
|
# add deprecated ipyparallel control messages
|
||
|
|
control_msg_types = msg_types + ['clear_request', 'abort_request']
|
||
|
|
|
||
|
|
def __init__(self, **kwargs):
|
||
|
|
super(Kernel, self).__init__(**kwargs)
|
||
|
|
# Build dict of handlers for message types
|
||
|
|
self.shell_handlers = {}
|
||
|
|
for msg_type in self.msg_types:
|
||
|
|
self.shell_handlers[msg_type] = getattr(self, msg_type)
|
||
|
|
|
||
|
|
self.control_handlers = {}
|
||
|
|
for msg_type in self.control_msg_types:
|
||
|
|
self.control_handlers[msg_type] = getattr(self, msg_type)
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def dispatch_control(self, msg):
|
||
|
|
"""dispatch control requests"""
|
||
|
|
idents, msg = self.session.feed_identities(msg, copy=False)
|
||
|
|
try:
|
||
|
|
msg = self.session.deserialize(msg, content=True, copy=False)
|
||
|
|
except:
|
||
|
|
self.log.error("Invalid Control Message", exc_info=True)
|
||
|
|
return
|
||
|
|
|
||
|
|
self.log.debug("Control received: %s", msg)
|
||
|
|
|
||
|
|
# Set the parent message for side effects.
|
||
|
|
self.set_parent(idents, msg)
|
||
|
|
self._publish_status(u'busy')
|
||
|
|
if self._aborting:
|
||
|
|
self._send_abort_reply(self.control_stream, msg, idents)
|
||
|
|
self._publish_status(u'idle')
|
||
|
|
return
|
||
|
|
|
||
|
|
header = msg['header']
|
||
|
|
msg_type = header['msg_type']
|
||
|
|
|
||
|
|
handler = self.control_handlers.get(msg_type, None)
|
||
|
|
if handler is None:
|
||
|
|
self.log.error("UNKNOWN CONTROL MESSAGE TYPE: %r", msg_type)
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
yield gen.maybe_future(handler(self.control_stream, idents, msg))
|
||
|
|
except Exception:
|
||
|
|
self.log.error("Exception in control handler:", exc_info=True)
|
||
|
|
|
||
|
|
sys.stdout.flush()
|
||
|
|
sys.stderr.flush()
|
||
|
|
self._publish_status(u'idle')
|
||
|
|
# flush to ensure reply is sent
|
||
|
|
self.control_stream.flush(zmq.POLLOUT)
|
||
|
|
|
||
|
|
def should_handle(self, stream, msg, idents):
|
||
|
|
"""Check whether a shell-channel message should be handled
|
||
|
|
|
||
|
|
Allows subclasses to prevent handling of certain messages (e.g. aborted requests).
|
||
|
|
"""
|
||
|
|
msg_id = msg['header']['msg_id']
|
||
|
|
if msg_id in self.aborted:
|
||
|
|
msg_type = msg['header']['msg_type']
|
||
|
|
# is it safe to assume a msg_id will not be resubmitted?
|
||
|
|
self.aborted.remove(msg_id)
|
||
|
|
self._send_abort_reply(stream, msg, idents)
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def dispatch_shell(self, stream, msg):
|
||
|
|
"""dispatch shell requests"""
|
||
|
|
idents, msg = self.session.feed_identities(msg, copy=False)
|
||
|
|
try:
|
||
|
|
msg = self.session.deserialize(msg, content=True, copy=False)
|
||
|
|
except:
|
||
|
|
self.log.error("Invalid Message", exc_info=True)
|
||
|
|
return
|
||
|
|
|
||
|
|
# Set the parent message for side effects.
|
||
|
|
self.set_parent(idents, msg)
|
||
|
|
self._publish_status(u'busy')
|
||
|
|
|
||
|
|
if self._aborting:
|
||
|
|
self._send_abort_reply(stream, msg, idents)
|
||
|
|
self._publish_status(u'idle')
|
||
|
|
# flush to ensure reply is sent before
|
||
|
|
# handling the next request
|
||
|
|
stream.flush(zmq.POLLOUT)
|
||
|
|
return
|
||
|
|
|
||
|
|
msg_type = msg['header']['msg_type']
|
||
|
|
|
||
|
|
# Print some info about this message and leave a '--->' marker, so it's
|
||
|
|
# easier to trace visually the message chain when debugging. Each
|
||
|
|
# handler prints its message at the end.
|
||
|
|
self.log.debug('\n*** MESSAGE TYPE:%s***', msg_type)
|
||
|
|
self.log.debug(' Content: %s\n --->\n ', msg['content'])
|
||
|
|
|
||
|
|
if not self.should_handle(stream, msg, idents):
|
||
|
|
return
|
||
|
|
|
||
|
|
handler = self.shell_handlers.get(msg_type, None)
|
||
|
|
if handler is None:
|
||
|
|
self.log.warning("Unknown message type: %r", msg_type)
|
||
|
|
else:
|
||
|
|
self.log.debug("%s: %s", msg_type, msg)
|
||
|
|
try:
|
||
|
|
self.pre_handler_hook()
|
||
|
|
except Exception:
|
||
|
|
self.log.debug("Unable to signal in pre_handler_hook:", exc_info=True)
|
||
|
|
try:
|
||
|
|
yield gen.maybe_future(handler(stream, idents, msg))
|
||
|
|
except Exception:
|
||
|
|
self.log.error("Exception in message handler:", exc_info=True)
|
||
|
|
finally:
|
||
|
|
try:
|
||
|
|
self.post_handler_hook()
|
||
|
|
except Exception:
|
||
|
|
self.log.debug("Unable to signal in post_handler_hook:", exc_info=True)
|
||
|
|
|
||
|
|
sys.stdout.flush()
|
||
|
|
sys.stderr.flush()
|
||
|
|
self._publish_status(u'idle')
|
||
|
|
# flush to ensure reply is sent before
|
||
|
|
# handling the next request
|
||
|
|
stream.flush(zmq.POLLOUT)
|
||
|
|
|
||
|
|
def pre_handler_hook(self):
|
||
|
|
"""Hook to execute before calling message handler"""
|
||
|
|
# ensure default_int_handler during handler call
|
||
|
|
self.saved_sigint_handler = signal(SIGINT, default_int_handler)
|
||
|
|
|
||
|
|
def post_handler_hook(self):
|
||
|
|
"""Hook to execute after calling message handler"""
|
||
|
|
signal(SIGINT, self.saved_sigint_handler)
|
||
|
|
|
||
|
|
def enter_eventloop(self):
|
||
|
|
"""enter eventloop"""
|
||
|
|
self.log.info("Entering eventloop %s", self.eventloop)
|
||
|
|
# record handle, so we can check when this changes
|
||
|
|
eventloop = self.eventloop
|
||
|
|
if eventloop is None:
|
||
|
|
self.log.info("Exiting as there is no eventloop")
|
||
|
|
return
|
||
|
|
|
||
|
|
def advance_eventloop():
|
||
|
|
# check if eventloop changed:
|
||
|
|
if self.eventloop is not eventloop:
|
||
|
|
self.log.info("exiting eventloop %s", eventloop)
|
||
|
|
return
|
||
|
|
if self.msg_queue.qsize():
|
||
|
|
self.log.debug("Delaying eventloop due to waiting messages")
|
||
|
|
# still messages to process, make the eventloop wait
|
||
|
|
schedule_next()
|
||
|
|
return
|
||
|
|
self.log.debug("Advancing eventloop %s", eventloop)
|
||
|
|
try:
|
||
|
|
eventloop(self)
|
||
|
|
except KeyboardInterrupt:
|
||
|
|
# Ctrl-C shouldn't crash the kernel
|
||
|
|
self.log.error("KeyboardInterrupt caught in kernel")
|
||
|
|
pass
|
||
|
|
if self.eventloop is eventloop:
|
||
|
|
# schedule advance again
|
||
|
|
schedule_next()
|
||
|
|
|
||
|
|
def schedule_next():
|
||
|
|
"""Schedule the next advance of the eventloop"""
|
||
|
|
# flush the eventloop every so often,
|
||
|
|
# giving us a chance to handle messages in the meantime
|
||
|
|
self.log.debug("Scheduling eventloop advance")
|
||
|
|
self.io_loop.call_later(1, advance_eventloop)
|
||
|
|
|
||
|
|
# begin polling the eventloop
|
||
|
|
schedule_next()
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def do_one_iteration(self):
|
||
|
|
"""Process a single shell message
|
||
|
|
|
||
|
|
Any pending control messages will be flushed as well
|
||
|
|
|
||
|
|
.. versionchanged:: 5
|
||
|
|
This is now a coroutine
|
||
|
|
"""
|
||
|
|
# flush messages off of shell streams into the message queue
|
||
|
|
for stream in self.shell_streams:
|
||
|
|
stream.flush()
|
||
|
|
# process all messages higher priority than shell (control),
|
||
|
|
# and at most one shell message per iteration
|
||
|
|
priority = 0
|
||
|
|
while priority is not None and priority < SHELL_PRIORITY:
|
||
|
|
priority = yield self.process_one(wait=False)
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def process_one(self, wait=True):
|
||
|
|
"""Process one request
|
||
|
|
|
||
|
|
Returns priority of the message handled.
|
||
|
|
Returns None if no message was handled.
|
||
|
|
"""
|
||
|
|
if wait:
|
||
|
|
priority, t, dispatch, args = yield self.msg_queue.get()
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
priority, t, dispatch, args = self.msg_queue.get_nowait()
|
||
|
|
except QueueEmpty:
|
||
|
|
return None
|
||
|
|
yield gen.maybe_future(dispatch(*args))
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def dispatch_queue(self):
|
||
|
|
"""Coroutine to preserve order of message handling
|
||
|
|
|
||
|
|
Ensures that only one message is processing at a time,
|
||
|
|
even when the handler is async
|
||
|
|
"""
|
||
|
|
|
||
|
|
while True:
|
||
|
|
# ensure control stream is flushed before processing shell messages
|
||
|
|
if self.control_stream:
|
||
|
|
self.control_stream.flush()
|
||
|
|
# receive the next message and handle it
|
||
|
|
try:
|
||
|
|
yield self.process_one()
|
||
|
|
except Exception:
|
||
|
|
self.log.exception("Error in message handler")
|
||
|
|
|
||
|
|
_message_counter = Any(
|
||
|
|
help="""Monotonic counter of messages
|
||
|
|
|
||
|
|
Ensures messages of the same priority are handled in arrival order.
|
||
|
|
""",
|
||
|
|
)
|
||
|
|
@default('_message_counter')
|
||
|
|
def _message_counter_default(self):
|
||
|
|
return itertools.count()
|
||
|
|
|
||
|
|
def schedule_dispatch(self, priority, dispatch, *args):
|
||
|
|
"""schedule a message for dispatch"""
|
||
|
|
idx = next(self._message_counter)
|
||
|
|
|
||
|
|
self.msg_queue.put_nowait(
|
||
|
|
(
|
||
|
|
priority,
|
||
|
|
idx,
|
||
|
|
dispatch,
|
||
|
|
args,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
# ensure the eventloop wakes up
|
||
|
|
self.io_loop.add_callback(lambda: None)
|
||
|
|
|
||
|
|
def start(self):
|
||
|
|
"""register dispatchers for streams"""
|
||
|
|
self.io_loop = ioloop.IOLoop.current()
|
||
|
|
self.msg_queue = PriorityQueue()
|
||
|
|
self.io_loop.add_callback(self.dispatch_queue)
|
||
|
|
|
||
|
|
|
||
|
|
if self.control_stream:
|
||
|
|
self.control_stream.on_recv(
|
||
|
|
partial(
|
||
|
|
self.schedule_dispatch,
|
||
|
|
CONTROL_PRIORITY,
|
||
|
|
self.dispatch_control,
|
||
|
|
),
|
||
|
|
copy=False,
|
||
|
|
)
|
||
|
|
|
||
|
|
for s in self.shell_streams:
|
||
|
|
if s is self.control_stream:
|
||
|
|
continue
|
||
|
|
s.on_recv(
|
||
|
|
partial(
|
||
|
|
self.schedule_dispatch,
|
||
|
|
SHELL_PRIORITY,
|
||
|
|
self.dispatch_shell,
|
||
|
|
s,
|
||
|
|
),
|
||
|
|
copy=False,
|
||
|
|
)
|
||
|
|
|
||
|
|
# publish idle status
|
||
|
|
self._publish_status('starting')
|
||
|
|
|
||
|
|
|
||
|
|
def record_ports(self, ports):
|
||
|
|
"""Record the ports that this kernel is using.
|
||
|
|
|
||
|
|
The creator of the Kernel instance must call this methods if they
|
||
|
|
want the :meth:`connect_request` method to return the port numbers.
|
||
|
|
"""
|
||
|
|
self._recorded_ports = ports
|
||
|
|
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
# Kernel request handlers
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
|
||
|
|
def _publish_execute_input(self, code, parent, execution_count):
|
||
|
|
"""Publish the code request on the iopub stream."""
|
||
|
|
|
||
|
|
self.session.send(self.iopub_socket, u'execute_input',
|
||
|
|
{u'code':code, u'execution_count': execution_count},
|
||
|
|
parent=parent, ident=self._topic('execute_input')
|
||
|
|
)
|
||
|
|
|
||
|
|
def _publish_status(self, status, parent=None):
|
||
|
|
"""send status (busy/idle) on IOPub"""
|
||
|
|
self.session.send(self.iopub_socket,
|
||
|
|
u'status',
|
||
|
|
{u'execution_state': status},
|
||
|
|
parent=parent or self._parent_header,
|
||
|
|
ident=self._topic('status'),
|
||
|
|
)
|
||
|
|
|
||
|
|
def set_parent(self, ident, parent):
|
||
|
|
"""Set the current parent_header
|
||
|
|
|
||
|
|
Side effects (IOPub messages) and replies are associated with
|
||
|
|
the request that caused them via the parent_header.
|
||
|
|
|
||
|
|
The parent identity is used to route input_request messages
|
||
|
|
on the stdin channel.
|
||
|
|
"""
|
||
|
|
self._parent_ident = ident
|
||
|
|
self._parent_header = parent
|
||
|
|
|
||
|
|
def send_response(self, stream, msg_or_type, content=None, ident=None,
|
||
|
|
buffers=None, track=False, header=None, metadata=None):
|
||
|
|
"""Send a response to the message we're currently processing.
|
||
|
|
|
||
|
|
This accepts all the parameters of :meth:`jupyter_client.session.Session.send`
|
||
|
|
except ``parent``.
|
||
|
|
|
||
|
|
This relies on :meth:`set_parent` having been called for the current
|
||
|
|
message.
|
||
|
|
"""
|
||
|
|
return self.session.send(stream, msg_or_type, content, self._parent_header,
|
||
|
|
ident, buffers, track, header, metadata)
|
||
|
|
|
||
|
|
def init_metadata(self, parent):
|
||
|
|
"""Initialize metadata.
|
||
|
|
|
||
|
|
Run at the beginning of execution requests.
|
||
|
|
"""
|
||
|
|
# FIXME: `started` is part of ipyparallel
|
||
|
|
# Remove for ipykernel 5.0
|
||
|
|
return {
|
||
|
|
'started': now(),
|
||
|
|
}
|
||
|
|
|
||
|
|
def finish_metadata(self, parent, metadata, reply_content):
|
||
|
|
"""Finish populating metadata.
|
||
|
|
|
||
|
|
Run after completing an execution request.
|
||
|
|
"""
|
||
|
|
return metadata
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def execute_request(self, stream, ident, parent):
|
||
|
|
"""handle an execute_request"""
|
||
|
|
|
||
|
|
try:
|
||
|
|
content = parent[u'content']
|
||
|
|
code = py3compat.cast_unicode_py2(content[u'code'])
|
||
|
|
silent = content[u'silent']
|
||
|
|
store_history = content.get(u'store_history', not silent)
|
||
|
|
user_expressions = content.get('user_expressions', {})
|
||
|
|
allow_stdin = content.get('allow_stdin', False)
|
||
|
|
except:
|
||
|
|
self.log.error("Got bad msg: ")
|
||
|
|
self.log.error("%s", parent)
|
||
|
|
return
|
||
|
|
|
||
|
|
stop_on_error = content.get('stop_on_error', True)
|
||
|
|
|
||
|
|
metadata = self.init_metadata(parent)
|
||
|
|
|
||
|
|
# Re-broadcast our input for the benefit of listening clients, and
|
||
|
|
# start computing output
|
||
|
|
if not silent:
|
||
|
|
self.execution_count += 1
|
||
|
|
self._publish_execute_input(code, parent, self.execution_count)
|
||
|
|
|
||
|
|
reply_content = yield gen.maybe_future(
|
||
|
|
self.do_execute(
|
||
|
|
code, silent, store_history,
|
||
|
|
user_expressions, allow_stdin,
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
# Flush output before sending the reply.
|
||
|
|
sys.stdout.flush()
|
||
|
|
sys.stderr.flush()
|
||
|
|
# FIXME: on rare occasions, the flush doesn't seem to make it to the
|
||
|
|
# clients... This seems to mitigate the problem, but we definitely need
|
||
|
|
# to better understand what's going on.
|
||
|
|
if self._execute_sleep:
|
||
|
|
time.sleep(self._execute_sleep)
|
||
|
|
|
||
|
|
# Send the reply.
|
||
|
|
reply_content = json_clean(reply_content)
|
||
|
|
metadata = self.finish_metadata(parent, metadata, reply_content)
|
||
|
|
|
||
|
|
reply_msg = self.session.send(stream, u'execute_reply',
|
||
|
|
reply_content, parent, metadata=metadata,
|
||
|
|
ident=ident)
|
||
|
|
|
||
|
|
self.log.debug("%s", reply_msg)
|
||
|
|
|
||
|
|
if not silent and reply_msg['content']['status'] == u'error' and stop_on_error:
|
||
|
|
yield self._abort_queues()
|
||
|
|
|
||
|
|
def do_execute(self, code, silent, store_history=True,
|
||
|
|
user_expressions=None, allow_stdin=False):
|
||
|
|
"""Execute user code. Must be overridden by subclasses.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def complete_request(self, stream, ident, parent):
|
||
|
|
content = parent['content']
|
||
|
|
code = content['code']
|
||
|
|
cursor_pos = content['cursor_pos']
|
||
|
|
|
||
|
|
matches = yield gen.maybe_future(self.do_complete(code, cursor_pos))
|
||
|
|
matches = json_clean(matches)
|
||
|
|
completion_msg = self.session.send(stream, 'complete_reply',
|
||
|
|
matches, parent, ident)
|
||
|
|
|
||
|
|
def do_complete(self, code, cursor_pos):
|
||
|
|
"""Override in subclasses to find completions.
|
||
|
|
"""
|
||
|
|
return {'matches' : [],
|
||
|
|
'cursor_end' : cursor_pos,
|
||
|
|
'cursor_start' : cursor_pos,
|
||
|
|
'metadata' : {},
|
||
|
|
'status' : 'ok'}
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def inspect_request(self, stream, ident, parent):
|
||
|
|
content = parent['content']
|
||
|
|
|
||
|
|
reply_content = yield gen.maybe_future(
|
||
|
|
self.do_inspect(
|
||
|
|
content['code'], content['cursor_pos'],
|
||
|
|
content.get('detail_level', 0),
|
||
|
|
)
|
||
|
|
)
|
||
|
|
# Before we send this object over, we scrub it for JSON usage
|
||
|
|
reply_content = json_clean(reply_content)
|
||
|
|
msg = self.session.send(stream, 'inspect_reply',
|
||
|
|
reply_content, parent, ident)
|
||
|
|
self.log.debug("%s", msg)
|
||
|
|
|
||
|
|
def do_inspect(self, code, cursor_pos, detail_level=0):
|
||
|
|
"""Override in subclasses to allow introspection.
|
||
|
|
"""
|
||
|
|
return {'status': 'ok', 'data': {}, 'metadata': {}, 'found': False}
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def history_request(self, stream, ident, parent):
|
||
|
|
content = parent['content']
|
||
|
|
|
||
|
|
reply_content = yield gen.maybe_future(self.do_history(**content))
|
||
|
|
|
||
|
|
reply_content = json_clean(reply_content)
|
||
|
|
msg = self.session.send(stream, 'history_reply',
|
||
|
|
reply_content, parent, ident)
|
||
|
|
self.log.debug("%s", msg)
|
||
|
|
|
||
|
|
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 {'status': 'ok', 'history': []}
|
||
|
|
|
||
|
|
def connect_request(self, stream, ident, parent):
|
||
|
|
if self._recorded_ports is not None:
|
||
|
|
content = self._recorded_ports.copy()
|
||
|
|
else:
|
||
|
|
content = {}
|
||
|
|
content['status'] = 'ok'
|
||
|
|
msg = self.session.send(stream, 'connect_reply',
|
||
|
|
content, parent, ident)
|
||
|
|
self.log.debug("%s", msg)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def kernel_info(self):
|
||
|
|
return {
|
||
|
|
'protocol_version': 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):
|
||
|
|
content = {'status': 'ok'}
|
||
|
|
content.update(self.kernel_info)
|
||
|
|
msg = self.session.send(stream, 'kernel_info_reply',
|
||
|
|
content, parent, ident)
|
||
|
|
self.log.debug("%s", msg)
|
||
|
|
|
||
|
|
def comm_info_request(self, stream, ident, parent):
|
||
|
|
content = parent['content']
|
||
|
|
target_name = content.get('target_name', None)
|
||
|
|
|
||
|
|
# Should this be moved to ipkernel?
|
||
|
|
if hasattr(self, 'comm_manager'):
|
||
|
|
comms = {
|
||
|
|
k: dict(target_name=v.target_name)
|
||
|
|
for (k, v) in self.comm_manager.comms.items()
|
||
|
|
if v.target_name == target_name or target_name is None
|
||
|
|
}
|
||
|
|
else:
|
||
|
|
comms = {}
|
||
|
|
reply_content = dict(comms=comms, status='ok')
|
||
|
|
msg = self.session.send(stream, 'comm_info_reply',
|
||
|
|
reply_content, parent, ident)
|
||
|
|
self.log.debug("%s", msg)
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def shutdown_request(self, stream, ident, parent):
|
||
|
|
content = yield gen.maybe_future(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.current()
|
||
|
|
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}
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def is_complete_request(self, stream, ident, parent):
|
||
|
|
content = parent['content']
|
||
|
|
code = content['code']
|
||
|
|
|
||
|
|
reply_content = yield gen.maybe_future(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 (DEPRECATED)
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
|
||
|
|
def apply_request(self, stream, ident, parent):
|
||
|
|
self.log.warning("apply_request is deprecated in kernel_base, moving to ipyparallel.")
|
||
|
|
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.init_metadata(parent)
|
||
|
|
|
||
|
|
reply_content, result_buf = self.do_apply(content, bufs, msg_id, md)
|
||
|
|
|
||
|
|
# flush i/o
|
||
|
|
sys.stdout.flush()
|
||
|
|
sys.stderr.flush()
|
||
|
|
|
||
|
|
md = self.finish_metadata(parent, md, reply_content)
|
||
|
|
|
||
|
|
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):
|
||
|
|
"""DEPRECATED"""
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
# Control messages (DEPRECATED)
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
|
||
|
|
def abort_request(self, stream, ident, parent):
|
||
|
|
"""abort a specific msg by id"""
|
||
|
|
self.log.warning("abort_request is deprecated in kernel_base. It is only part of IPython parallel")
|
||
|
|
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."""
|
||
|
|
self.log.warning("clear_request is deprecated in kernel_base. It is only part of IPython parallel")
|
||
|
|
content = self.do_clear()
|
||
|
|
self.session.send(stream, 'clear_reply', ident=idents, parent=parent,
|
||
|
|
content = content)
|
||
|
|
|
||
|
|
def do_clear(self):
|
||
|
|
"""DEPRECATED since 4.0.3"""
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
# Protected interface
|
||
|
|
#---------------------------------------------------------------------------
|
||
|
|
|
||
|
|
def _topic(self, topic):
|
||
|
|
"""prefixed topic for IOPub messages"""
|
||
|
|
base = "kernel.%s" % self.ident
|
||
|
|
|
||
|
|
return py3compat.cast_bytes("%s.%s" % (base, topic))
|
||
|
|
|
||
|
|
_aborting = Bool(False)
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def _abort_queues(self):
|
||
|
|
for stream in self.shell_streams:
|
||
|
|
stream.flush()
|
||
|
|
self._aborting = True
|
||
|
|
|
||
|
|
self.schedule_dispatch(
|
||
|
|
ABORT_PRIORITY,
|
||
|
|
self._dispatch_abort,
|
||
|
|
)
|
||
|
|
|
||
|
|
@gen.coroutine
|
||
|
|
def _dispatch_abort(self):
|
||
|
|
self.log.info("Finishing abort")
|
||
|
|
yield gen.sleep(self.stop_on_error_timeout)
|
||
|
|
self._aborting = False
|
||
|
|
|
||
|
|
def _send_abort_reply(self, stream, msg, idents):
|
||
|
|
"""Send a reply to an aborted request"""
|
||
|
|
self.log.info("Aborting:")
|
||
|
|
self.log.info("%s", msg)
|
||
|
|
reply_type = msg['header']['msg_type'].rsplit('_', 1)[0] + '_reply'
|
||
|
|
status = {'status': 'aborted'}
|
||
|
|
md = {'engine': self.ident}
|
||
|
|
md.update(status)
|
||
|
|
self.session.send(
|
||
|
|
stream, reply_type, metadata=md,
|
||
|
|
content=status, parent=msg, ident=idents,
|
||
|
|
)
|
||
|
|
|
||
|
|
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='', stream=None):
|
||
|
|
"""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."
|
||
|
|
)
|
||
|
|
if stream is not None:
|
||
|
|
import warnings
|
||
|
|
warnings.warn("The `stream` parameter of `getpass.getpass` will have no effect when using ipykernel",
|
||
|
|
UserWarning, stacklevel=2)
|
||
|
|
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(str(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:
|
||
|
|
# Use polling with select() so KeyboardInterrupts can get
|
||
|
|
# through; doing a blocking recv() means stdin reads are
|
||
|
|
# uninterruptible on Windows. We need a timeout because
|
||
|
|
# zmq.select() is also uninterruptible, but at least this
|
||
|
|
# way reads get noticed immediately and KeyboardInterrupts
|
||
|
|
# get noticed fairly quickly by human response time standards.
|
||
|
|
rlist, _, xlist = zmq.select(
|
||
|
|
[self.stdin_socket], [], [self.stdin_socket], 0.01
|
||
|
|
)
|
||
|
|
if rlist or xlist:
|
||
|
|
ident, reply = self.session.recv(self.stdin_socket)
|
||
|
|
if (ident, reply) != (None, None):
|
||
|
|
break
|
||
|
|
except KeyboardInterrupt:
|
||
|
|
# re-raise KeyboardInterrupt, to truncate traceback
|
||
|
|
raise KeyboardInterrupt("Interrupted by user") from None
|
||
|
|
except Exception as e:
|
||
|
|
self.log.warning("Invalid Message:", exc_info=True)
|
||
|
|
|
||
|
|
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.
|
||
|
|
"""
|
||
|
|
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 ]
|