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#!/usr/bin/env python
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"""A simple interactive kernel that talks to a frontend over 0MQ.
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Things to do:
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* Implement `set_parent` logic. Right before doing exec, the Kernel should
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call set_parent on all the PUB objects with the message about to be executed.
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* Implement random port and security key logic.
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* Implement control messages.
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* Implement event loop and poll version.
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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# Standard library imports
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import __builtin__
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import sys
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import time
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import traceback
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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, getsignal, default_int_handler, SIGINT, SIG_IGN
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)
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# System library imports
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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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# Local imports
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from IPython.config.configurable import Configurable
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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 io
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from IPython.utils import py3compat
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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, CaselessStrEnum, List, Set, Integer, Unicode,
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Type
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)
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from serialize import serialize_object, unpack_apply_message
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from session import Session
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from zmqshell import ZMQInteractiveShell
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#-----------------------------------------------------------------------------
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# Main kernel class
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#-----------------------------------------------------------------------------
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protocol_version = list(release.kernel_protocol_version_info)
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ipython_version = list(release.version_info)
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language_version = list(sys.version_info[:3])
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class Kernel(Configurable):
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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_timeout(time.time()+0.1, self.enter_eventloop)
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
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shell_class = Type(ZMQInteractiveShell)
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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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user_module = Any()
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def _user_module_changed(self, name, old, new):
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if self.shell is not None:
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self.shell.user_module = new
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user_ns = Dict(default_value=None)
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def _user_ns_changed(self, name, old, new):
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if self.shell is not None:
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self.shell.user_ns = new
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self.shell.init_user_ns()
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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(uuid.uuid4())
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# Private interface
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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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# A reference to the Python builtin 'raw_input' function.
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# (i.e., __builtin__.raw_input for Python 2.7, builtins.input for Python 3)
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_sys_raw_input = Any()
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# set of aborted msg_ids
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aborted = Set()
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def __init__(self, **kwargs):
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super(Kernel, self).__init__(**kwargs)
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# Initialize the InteractiveShell subclass
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self.shell = self.shell_class.instance(config=self.config,
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profile_dir = self.profile_dir,
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user_module = self.user_module,
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user_ns = self.user_ns,
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)
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self.shell.displayhook.session = self.session
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self.shell.displayhook.pub_socket = self.iopub_socket
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self.shell.displayhook.topic = self._topic('pyout')
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self.shell.display_pub.session = self.session
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self.shell.display_pub.pub_socket = self.iopub_socket
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self.shell.data_pub.session = self.session
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self.shell.data_pub.pub_socket = self.iopub_socket
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# TMP - hack while developing
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self.shell._reply_content = None
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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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'object_info_request', 'history_request',
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'kernel_info_request',
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'connect_request', 'shutdown_request',
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'apply_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.unserialize(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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header = msg['header']
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msg_id = header['msg_id']
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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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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.unserialize(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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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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reply_msg = 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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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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def enter_eventloop(self):
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"""enter eventloop"""
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self.log.info("entering eventloop")
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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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self.shell.exit_now = False
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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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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_pyin(self, code, parent, execution_count):
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"""Publish the code request on the pyin stream."""
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self.session.send(self.iopub_socket, u'pyin',
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{u'code':code, u'execution_count': execution_count},
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parent=parent, ident=self._topic('pyin')
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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,
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ident=self._topic('status'),
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)
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def execute_request(self, stream, ident, parent):
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"""handle an execute_request"""
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self._publish_status(u'busy', parent)
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try:
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content = parent[u'content']
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code = 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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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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md = self._make_metadata(parent['metadata'])
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shell = self.shell # we'll need this a lot here
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# Replace raw_input. Note that is not sufficient to replace
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# raw_input in the user namespace.
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if content.get('allow_stdin', False):
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raw_input = lambda prompt='': self._raw_input(prompt, ident, parent)
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else:
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raw_input = lambda prompt='' : self._no_raw_input()
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if py3compat.PY3:
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self._sys_raw_input = __builtin__.input
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__builtin__.input = raw_input
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else:
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self._sys_raw_input = __builtin__.raw_input
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__builtin__.raw_input = raw_input
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# Set the parent message of the display hook and out streams.
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shell.displayhook.set_parent(parent)
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shell.display_pub.set_parent(parent)
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shell.data_pub.set_parent(parent)
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try:
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sys.stdout.set_parent(parent)
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except AttributeError:
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pass
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try:
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sys.stderr.set_parent(parent)
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except AttributeError:
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pass
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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._publish_pyin(code, parent, shell.execution_count)
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reply_content = {}
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try:
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# FIXME: the shell calls the exception handler itself.
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shell.run_cell(code, store_history=store_history, silent=silent)
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except:
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status = u'error'
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# FIXME: this code right now isn't being used yet by default,
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# because the run_cell() call above directly fires off exception
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# reporting. This code, therefore, is only active in the scenario
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# where runlines itself has an unhandled exception. We need to
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# uniformize this, for all exception construction to come from a
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# single location in the codbase.
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etype, evalue, tb = sys.exc_info()
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tb_list = traceback.format_exception(etype, evalue, tb)
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reply_content.update(shell._showtraceback(etype, evalue, tb_list))
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else:
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status = u'ok'
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finally:
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# Restore raw_input.
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if py3compat.PY3:
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__builtin__.input = self._sys_raw_input
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else:
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__builtin__.raw_input = self._sys_raw_input
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reply_content[u'status'] = status
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# Return the execution counter so clients can display prompts
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reply_content['execution_count'] = shell.execution_count - 1
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# FIXME - fish exception info out of shell, possibly left there by
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# runlines. We'll need to clean up this logic later.
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if shell._reply_content is not None:
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reply_content.update(shell._reply_content)
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e_info = dict(engine_uuid=self.ident, engine_id=self.int_id, method='execute')
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reply_content['engine_info'] = e_info
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# reset after use
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shell._reply_content = None
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if 'traceback' in reply_content:
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self.log.info("Exception in execute request:\n%s", '\n'.join(reply_content['traceback']))
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# At this point, we can tell whether the main code execution succeeded
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# or not. If it did, we proceed to evaluate user_variables/expressions
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if reply_content['status'] == 'ok':
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reply_content[u'user_variables'] = \
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shell.user_variables(content.get(u'user_variables', []))
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reply_content[u'user_expressions'] = \
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shell.user_expressions(content.get(u'user_expressions', {}))
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else:
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# If there was an error, don't even try to compute variables or
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# expressions
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reply_content[u'user_variables'] = {}
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reply_content[u'user_expressions'] = {}
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# Payloads should be retrieved regardless of outcome, so we can both
|
|
|
# recover partial output (that could have been generated early in a
|
|
|
# block, before an error) and clear the payload system always.
|
|
|
reply_content[u'payload'] = shell.payload_manager.read_payload()
|
|
|
# Be agressive about clearing the payload because we don't want
|
|
|
# it to sit in memory until the next execute_request comes in.
|
|
|
shell.payload_manager.clear_payload()
|
|
|
|
|
|
# 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)
|
|
|
|
|
|
md['status'] = reply_content['status']
|
|
|
if reply_content['status'] == 'error' and \
|
|
|
reply_content['ename'] == 'UnmetDependency':
|
|
|
md['dependencies_met'] = False
|
|
|
|
|
|
reply_msg = self.session.send(stream, u'execute_reply',
|
|
|
reply_content, parent, metadata=md,
|
|
|
ident=ident)
|
|
|
|
|
|
self.log.debug("%s", reply_msg)
|
|
|
|
|
|
if not silent and reply_msg['content']['status'] == u'error':
|
|
|
self._abort_queues()
|
|
|
|
|
|
self._publish_status(u'idle', parent)
|
|
|
|
|
|
def complete_request(self, stream, ident, parent):
|
|
|
txt, matches = self._complete(parent)
|
|
|
matches = {'matches' : matches,
|
|
|
'matched_text' : txt,
|
|
|
'status' : 'ok'}
|
|
|
matches = json_clean(matches)
|
|
|
completion_msg = self.session.send(stream, 'complete_reply',
|
|
|
matches, parent, ident)
|
|
|
self.log.debug("%s", completion_msg)
|
|
|
|
|
|
def object_info_request(self, stream, ident, parent):
|
|
|
content = parent['content']
|
|
|
object_info = self.shell.object_inspect(content['oname'],
|
|
|
detail_level = content.get('detail_level', 0)
|
|
|
)
|
|
|
# Before we send this object over, we scrub it for JSON usage
|
|
|
oinfo = json_clean(object_info)
|
|
|
msg = self.session.send(stream, 'object_info_reply',
|
|
|
oinfo, parent, ident)
|
|
|
self.log.debug("%s", msg)
|
|
|
|
|
|
def history_request(self, stream, ident, parent):
|
|
|
# We need to pull these out, as passing **kwargs doesn't work with
|
|
|
# unicode keys before Python 2.6.5.
|
|
|
hist_access_type = parent['content']['hist_access_type']
|
|
|
raw = parent['content']['raw']
|
|
|
output = parent['content']['output']
|
|
|
if hist_access_type == 'tail':
|
|
|
n = parent['content']['n']
|
|
|
hist = self.shell.history_manager.get_tail(n, raw=raw, output=output,
|
|
|
include_latest=True)
|
|
|
|
|
|
elif hist_access_type == 'range':
|
|
|
session = parent['content']['session']
|
|
|
start = parent['content']['start']
|
|
|
stop = parent['content']['stop']
|
|
|
hist = self.shell.history_manager.get_range(session, start, stop,
|
|
|
raw=raw, output=output)
|
|
|
|
|
|
elif hist_access_type == 'search':
|
|
|
n = parent['content'].get('n')
|
|
|
unique = parent['content'].get('unique', False)
|
|
|
pattern = parent['content']['pattern']
|
|
|
hist = self.shell.history_manager.search(
|
|
|
pattern, raw=raw, output=output, n=n, unique=unique)
|
|
|
|
|
|
else:
|
|
|
hist = []
|
|
|
hist = list(hist)
|
|
|
content = {'history' : hist}
|
|
|
content = json_clean(content)
|
|
|
msg = self.session.send(stream, 'history_reply',
|
|
|
content, parent, ident)
|
|
|
self.log.debug("Sending history reply with %i entries", len(hist))
|
|
|
|
|
|
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)
|
|
|
|
|
|
def kernel_info_request(self, stream, ident, parent):
|
|
|
vinfo = {
|
|
|
'protocol_version': protocol_version,
|
|
|
'ipython_version': ipython_version,
|
|
|
'language_version': language_version,
|
|
|
'language': 'python',
|
|
|
}
|
|
|
msg = self.session.send(stream, 'kernel_info_reply',
|
|
|
vinfo, parent, ident)
|
|
|
self.log.debug("%s", msg)
|
|
|
|
|
|
def shutdown_request(self, stream, ident, parent):
|
|
|
self.shell.exit_now = True
|
|
|
content = dict(status='ok')
|
|
|
content.update(parent['content'])
|
|
|
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)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# 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
|
|
|
|
|
|
self._publish_status(u'busy', parent)
|
|
|
|
|
|
# Set the parent message of the display hook and out streams.
|
|
|
shell = self.shell
|
|
|
shell.displayhook.set_parent(parent)
|
|
|
shell.display_pub.set_parent(parent)
|
|
|
shell.data_pub.set_parent(parent)
|
|
|
try:
|
|
|
sys.stdout.set_parent(parent)
|
|
|
except AttributeError:
|
|
|
pass
|
|
|
try:
|
|
|
sys.stderr.set_parent(parent)
|
|
|
except AttributeError:
|
|
|
pass
|
|
|
|
|
|
# pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent)
|
|
|
# self.iopub_socket.send(pyin_msg)
|
|
|
# self.session.send(self.iopub_socket, u'pyin', {u'code':code},parent=parent)
|
|
|
md = self._make_metadata(parent['metadata'])
|
|
|
try:
|
|
|
working = shell.user_ns
|
|
|
|
|
|
prefix = "_"+str(msg_id).replace("-","")+"_"
|
|
|
|
|
|
f,args,kwargs = unpack_apply_message(bufs, working, copy=False)
|
|
|
|
|
|
fname = getattr(f, '__name__', 'f')
|
|
|
|
|
|
fname = prefix+"f"
|
|
|
argname = prefix+"args"
|
|
|
kwargname = prefix+"kwargs"
|
|
|
resultname = prefix+"result"
|
|
|
|
|
|
ns = { fname : f, argname : args, kwargname : kwargs , resultname : None }
|
|
|
# print ns
|
|
|
working.update(ns)
|
|
|
code = "%s = %s(*%s,**%s)" % (resultname, fname, argname, kwargname)
|
|
|
try:
|
|
|
exec code in shell.user_global_ns, shell.user_ns
|
|
|
result = working.get(resultname)
|
|
|
finally:
|
|
|
for key in ns.iterkeys():
|
|
|
working.pop(key)
|
|
|
|
|
|
result_buf = serialize_object(result,
|
|
|
buffer_threshold=self.session.buffer_threshold,
|
|
|
item_threshold=self.session.item_threshold,
|
|
|
)
|
|
|
|
|
|
except:
|
|
|
# invoke IPython traceback formatting
|
|
|
shell.showtraceback()
|
|
|
# FIXME - fish exception info out of shell, possibly left there by
|
|
|
# run_code. We'll need to clean up this logic later.
|
|
|
reply_content = {}
|
|
|
if shell._reply_content is not None:
|
|
|
reply_content.update(shell._reply_content)
|
|
|
e_info = dict(engine_uuid=self.ident, engine_id=self.int_id, method='apply')
|
|
|
reply_content['engine_info'] = e_info
|
|
|
# reset after use
|
|
|
shell._reply_content = None
|
|
|
|
|
|
self.session.send(self.iopub_socket, u'pyerr', reply_content, parent=parent,
|
|
|
ident=self._topic('pyerr'))
|
|
|
self.log.info("Exception in apply request:\n%s", '\n'.join(reply_content['traceback']))
|
|
|
result_buf = []
|
|
|
|
|
|
if reply_content['ename'] == 'UnmetDependency':
|
|
|
md['dependencies_met'] = False
|
|
|
else:
|
|
|
reply_content = {'status' : 'ok'}
|
|
|
|
|
|
# put 'ok'/'error' status in header, for scheduler introspection:
|
|
|
md['status'] = reply_content['status']
|
|
|
|
|
|
# flush i/o
|
|
|
sys.stdout.flush()
|
|
|
sys.stderr.flush()
|
|
|
|
|
|
reply_msg = self.session.send(stream, u'apply_reply', reply_content,
|
|
|
parent=parent, ident=ident,buffers=result_buf, metadata=md)
|
|
|
|
|
|
self._publish_status(u'idle', parent)
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Control messages
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def abort_request(self, stream, ident, parent):
|
|
|
"""abort a specifig msg by id"""
|
|
|
msg_ids = parent['content'].get('msg_ids', None)
|
|
|
if isinstance(msg_ids, basestring):
|
|
|
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.shell.reset(False)
|
|
|
msg = self.session.send(stream, 'clear_reply', ident=idents, parent=parent,
|
|
|
content = dict(status='ok'))
|
|
|
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# Protected interface
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def _wrap_exception(self, method=None):
|
|
|
# import here, because _wrap_exception is only used in parallel,
|
|
|
# and parallel has higher min pyzmq version
|
|
|
from IPython.parallel.error import wrap_exception
|
|
|
e_info = dict(engine_uuid=self.ident, engine_id=self.int_id, method=method)
|
|
|
content = wrap_exception(e_info)
|
|
|
return content
|
|
|
|
|
|
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 _raw_input(self, prompt, ident, parent):
|
|
|
# Flush output before making the request.
|
|
|
sys.stderr.flush()
|
|
|
sys.stdout.flush()
|
|
|
|
|
|
# Send the input request.
|
|
|
content = json_clean(dict(prompt=prompt))
|
|
|
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)
|
|
|
else:
|
|
|
break
|
|
|
try:
|
|
|
value = reply['content']['value']
|
|
|
except:
|
|
|
self.log.error("Got bad raw_input reply: ")
|
|
|
self.log.error("%s", parent)
|
|
|
value = ''
|
|
|
if value == '\x04':
|
|
|
# EOF
|
|
|
raise EOFError
|
|
|
return value
|
|
|
|
|
|
def _complete(self, msg):
|
|
|
c = msg['content']
|
|
|
try:
|
|
|
cpos = int(c['cursor_pos'])
|
|
|
except:
|
|
|
# If we don't get something that we can convert to an integer, at
|
|
|
# least attempt the completion guessing the cursor is at the end of
|
|
|
# the text, if there's any, and otherwise of the line
|
|
|
cpos = len(c['text'])
|
|
|
if cpos==0:
|
|
|
cpos = len(c['line'])
|
|
|
return self.shell.complete(c['text'], c['line'], cpos)
|
|
|
|
|
|
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 ]
|
|
|
|
|
|
|
