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#!/usr/bin/env python
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"""
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Kernel adapted from kernel.py to use ZMQ Streams
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Standard library imports.
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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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from code import CommandCompiler
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from datetime import datetime
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from pprint import pprint
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# System library imports.
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import zmq
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from zmq.eventloop import ioloop, zmqstream
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# Local imports.
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from IPython.utils.traitlets import Instance, List, Int, Dict, Set, Unicode
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from IPython.zmq.completer import KernelCompleter
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from IPython.parallel.error import wrap_exception
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from IPython.parallel.factory import SessionFactory
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from IPython.parallel.util import serialize_object, unpack_apply_message
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def printer(*args):
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pprint(args, stream=sys.__stdout__)
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class _Passer(zmqstream.ZMQStream):
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"""Empty class that implements `send()` that does nothing.
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Subclass ZMQStream for Session typechecking
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"""
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def __init__(self, *args, **kwargs):
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pass
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def send(self, *args, **kwargs):
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pass
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send_multipart = send
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#-----------------------------------------------------------------------------
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# Main kernel class
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#-----------------------------------------------------------------------------
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class Kernel(SessionFactory):
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#---------------------------------------------------------------------------
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# Kernel interface
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#---------------------------------------------------------------------------
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# kwargs:
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exec_lines = List(Unicode, config=True,
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help="List of lines to execute")
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int_id = Int(-1)
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user_ns = Dict(config=True, help="""Set the user's namespace of the Kernel""")
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control_stream = Instance(zmqstream.ZMQStream)
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task_stream = Instance(zmqstream.ZMQStream)
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iopub_stream = Instance(zmqstream.ZMQStream)
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client = Instance('IPython.parallel.Client')
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# internals
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shell_streams = List()
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compiler = Instance(CommandCompiler, (), {})
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completer = Instance(KernelCompleter)
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aborted = Set()
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shell_handlers = Dict()
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control_handlers = Dict()
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def _set_prefix(self):
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self.prefix = "engine.%s"%self.int_id
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def _connect_completer(self):
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self.completer = KernelCompleter(self.user_ns)
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def __init__(self, **kwargs):
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super(Kernel, self).__init__(**kwargs)
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self._set_prefix()
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self._connect_completer()
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self.on_trait_change(self._set_prefix, 'id')
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self.on_trait_change(self._connect_completer, 'user_ns')
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# Build dict of handlers for message types
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for msg_type in ['execute_request', 'complete_request', 'apply_request',
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'clear_request']:
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self.shell_handlers[msg_type] = getattr(self, msg_type)
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for msg_type in ['shutdown_request', 'abort_request']+self.shell_handlers.keys():
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self.control_handlers[msg_type] = getattr(self, msg_type)
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self._initial_exec_lines()
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def _wrap_exception(self, method=None):
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e_info = dict(engine_uuid=self.ident, engine_id=self.int_id, method=method)
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content=wrap_exception(e_info)
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return content
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def _initial_exec_lines(self):
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s = _Passer()
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content = dict(silent=True, user_variable=[],user_expressions=[])
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for line in self.exec_lines:
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self.log.debug("executing initialization: %s"%line)
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content.update({'code':line})
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msg = self.session.msg('execute_request', content)
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self.execute_request(s, [], msg)
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#-------------------- control handlers -----------------------------
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def abort_queues(self):
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for stream in self.shell_streams:
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if stream:
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self.abort_queue(stream)
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def abort_queue(self, stream):
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while True:
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idents,msg = self.session.recv(stream, zmq.NOBLOCK, content=True)
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if msg is None:
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return
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self.log.info("Aborting:")
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self.log.info(str(msg))
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msg_type = msg['msg_type']
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reply_type = msg_type.split('_')[0] + '_reply'
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# reply_msg = self.session.msg(reply_type, {'status' : 'aborted'}, msg)
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# self.reply_socket.send(ident,zmq.SNDMORE)
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# self.reply_socket.send_json(reply_msg)
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reply_msg = self.session.send(stream, reply_type,
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content={'status' : 'aborted'}, parent=msg, ident=idents)[0]
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self.log.debug(str(reply_msg))
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# We need to wait a bit for requests to come in. This can probably
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# be set shorter for true asynchronous clients.
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time.sleep(0.05)
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def abort_request(self, stream, ident, parent):
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"""abort a specifig msg by id"""
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msg_ids = parent['content'].get('msg_ids', None)
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if isinstance(msg_ids, basestring):
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msg_ids = [msg_ids]
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if not msg_ids:
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self.abort_queues()
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for mid in msg_ids:
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self.aborted.add(str(mid))
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content = dict(status='ok')
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reply_msg = self.session.send(stream, 'abort_reply', content=content,
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parent=parent, ident=ident)
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self.log.debug(str(reply_msg))
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def shutdown_request(self, stream, ident, parent):
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"""kill ourself. This should really be handled in an external process"""
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try:
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self.abort_queues()
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except:
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content = self._wrap_exception('shutdown')
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else:
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content = dict(parent['content'])
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content['status'] = 'ok'
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msg = self.session.send(stream, 'shutdown_reply',
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content=content, parent=parent, ident=ident)
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self.log.debug(str(msg))
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dc = ioloop.DelayedCallback(lambda : sys.exit(0), 1000, self.loop)
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dc.start()
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def dispatch_control(self, msg):
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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.unpack_message(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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handler = self.control_handlers.get(msg['msg_type'], None)
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if handler is None:
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self.log.error("UNKNOWN CONTROL MESSAGE TYPE: %r"%msg['msg_type'])
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else:
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handler(self.control_stream, idents, msg)
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#-------------------- queue helpers ------------------------------
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def check_dependencies(self, dependencies):
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if not dependencies:
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return True
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if len(dependencies) == 2 and dependencies[0] in 'any all'.split():
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anyorall = dependencies[0]
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dependencies = dependencies[1]
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else:
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anyorall = 'all'
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results = self.client.get_results(dependencies,status_only=True)
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if results['status'] != 'ok':
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return False
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if anyorall == 'any':
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if not results['completed']:
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return False
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else:
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if results['pending']:
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return False
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return True
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def check_aborted(self, msg_id):
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return msg_id in self.aborted
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#-------------------- queue handlers -----------------------------
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def clear_request(self, stream, idents, parent):
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"""Clear our namespace."""
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self.user_ns = {}
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msg = self.session.send(stream, 'clear_reply', ident=idents, parent=parent,
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content = dict(status='ok'))
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self._initial_exec_lines()
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def execute_request(self, stream, ident, parent):
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self.log.debug('execute request %s'%parent)
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try:
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code = parent[u'content'][u'code']
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except:
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self.log.error("Got bad msg: %s"%parent, exc_info=True)
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return
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self.session.send(self.iopub_stream, u'pyin', {u'code':code},parent=parent,
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ident='%s.pyin'%self.prefix)
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started = datetime.now()
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try:
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comp_code = self.compiler(code, '<zmq-kernel>')
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# allow for not overriding displayhook
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if hasattr(sys.displayhook, 'set_parent'):
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sys.displayhook.set_parent(parent)
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sys.stdout.set_parent(parent)
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sys.stderr.set_parent(parent)
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exec comp_code in self.user_ns, self.user_ns
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except:
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exc_content = self._wrap_exception('execute')
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# exc_msg = self.session.msg(u'pyerr', exc_content, parent)
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self.session.send(self.iopub_stream, u'pyerr', exc_content, parent=parent,
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ident='%s.pyerr'%self.prefix)
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reply_content = exc_content
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else:
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reply_content = {'status' : 'ok'}
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reply_msg = self.session.send(stream, u'execute_reply', reply_content, parent=parent,
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ident=ident, subheader = dict(started=started))
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self.log.debug(str(reply_msg))
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if reply_msg['content']['status'] == u'error':
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self.abort_queues()
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def complete_request(self, stream, ident, parent):
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matches = {'matches' : self.complete(parent),
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'status' : 'ok'}
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completion_msg = self.session.send(stream, 'complete_reply',
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matches, parent, ident)
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# print >> sys.__stdout__, completion_msg
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def complete(self, msg):
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return self.completer.complete(msg.content.line, msg.content.text)
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def apply_request(self, stream, ident, parent):
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# flush previous reply, so this request won't block it
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stream.flush(zmq.POLLOUT)
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try:
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content = parent[u'content']
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bufs = parent[u'buffers']
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msg_id = parent['header']['msg_id']
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# bound = parent['header'].get('bound', False)
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except:
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self.log.error("Got bad msg: %s"%parent, exc_info=True)
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return
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# pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent)
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# self.iopub_stream.send(pyin_msg)
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# self.session.send(self.iopub_stream, u'pyin', {u'code':code},parent=parent)
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sub = {'dependencies_met' : True, 'engine' : self.ident,
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'started': datetime.now()}
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try:
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# allow for not overriding displayhook
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if hasattr(sys.displayhook, 'set_parent'):
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sys.displayhook.set_parent(parent)
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sys.stdout.set_parent(parent)
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sys.stderr.set_parent(parent)
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# exec "f(*args,**kwargs)" in self.user_ns, self.user_ns
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working = self.user_ns
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# suffix =
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prefix = "_"+str(msg_id).replace("-","")+"_"
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f,args,kwargs = unpack_apply_message(bufs, working, copy=False)
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# if bound:
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# bound_ns = Namespace(working)
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# args = [bound_ns]+list(args)
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fname = getattr(f, '__name__', 'f')
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fname = prefix+"f"
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argname = prefix+"args"
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kwargname = prefix+"kwargs"
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resultname = prefix+"result"
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ns = { fname : f, argname : args, kwargname : kwargs , resultname : None }
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# print ns
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working.update(ns)
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code = "%s=%s(*%s,**%s)"%(resultname, fname, argname, kwargname)
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try:
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exec code in working,working
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result = working.get(resultname)
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finally:
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for key in ns.iterkeys():
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working.pop(key)
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# if bound:
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# working.update(bound_ns)
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packed_result,buf = serialize_object(result)
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result_buf = [packed_result]+buf
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except:
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exc_content = self._wrap_exception('apply')
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# exc_msg = self.session.msg(u'pyerr', exc_content, parent)
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self.session.send(self.iopub_stream, u'pyerr', exc_content, parent=parent,
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ident='%s.pyerr'%self.prefix)
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reply_content = exc_content
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result_buf = []
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if exc_content['ename'] == 'UnmetDependency':
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sub['dependencies_met'] = False
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else:
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reply_content = {'status' : 'ok'}
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# put 'ok'/'error' status in header, for scheduler introspection:
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sub['status'] = reply_content['status']
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reply_msg = self.session.send(stream, u'apply_reply', reply_content,
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parent=parent, ident=ident,buffers=result_buf, subheader=sub)
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# flush i/o
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# should this be before reply_msg is sent, like in the single-kernel code,
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# or should nothing get in the way of real results?
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sys.stdout.flush()
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sys.stderr.flush()
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def dispatch_queue(self, stream, msg):
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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.unpack_message(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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if self.check_aborted(msg_id):
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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['msg_type'].split('_')[0] + '_reply'
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status = {'status' : 'aborted'}
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reply_msg = self.session.send(stream, reply_type, subheader=status,
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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['msg_type'], None)
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if handler is None:
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self.log.error("UNKNOWN MESSAGE TYPE: %r"%msg['msg_type'])
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else:
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handler(stream, idents, msg)
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def start(self):
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#### stream mode:
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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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self.control_stream.on_err(printer)
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def make_dispatcher(stream):
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def dispatcher(msg):
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return self.dispatch_queue(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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s.on_err(printer)
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if self.iopub_stream:
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self.iopub_stream.on_err(printer)
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#### while True mode:
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# while True:
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# idle = True
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# try:
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# msg = self.shell_stream.socket.recv_multipart(
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# zmq.NOBLOCK, copy=False)
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# except zmq.ZMQError, e:
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# if e.errno != zmq.EAGAIN:
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# raise e
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# else:
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# idle=False
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# self.dispatch_queue(self.shell_stream, msg)
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#
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# if not self.task_stream.empty():
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# idle=False
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# msg = self.task_stream.recv_multipart()
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# self.dispatch_queue(self.task_stream, msg)
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# if idle:
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# # don't busywait
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# time.sleep(1e-3)
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