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"""A simple engine that talks to a controller over 0MQ.
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it handles registration, etc. and launches a kernel
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connected to the Controller's Schedulers.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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import sys
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import time
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from getpass import getpass
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import zmq
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from zmq.eventloop import ioloop, zmqstream
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from IPython.utils.localinterfaces import localhost
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from IPython.utils.traitlets import (
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Instance, Dict, Integer, Type, Float, Unicode, CBytes, Bool
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)
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from IPython.utils.py3compat import cast_bytes
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from ipython_parallel.controller.heartmonitor import Heart
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from ipython_parallel.factory import RegistrationFactory
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from ipython_parallel.util import disambiguate_url
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from IPython.kernel.zmq.ipkernel import IPythonKernel as Kernel
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from IPython.kernel.zmq.kernelapp import IPKernelApp
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class EngineFactory(RegistrationFactory):
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"""IPython engine"""
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# configurables:
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out_stream_factory=Type('IPython.kernel.zmq.iostream.OutStream', config=True,
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help="""The OutStream for handling stdout/err.
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Typically 'IPython.kernel.zmq.iostream.OutStream'""")
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display_hook_factory=Type('IPython.kernel.zmq.displayhook.ZMQDisplayHook', config=True,
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help="""The class for handling displayhook.
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Typically 'IPython.kernel.zmq.displayhook.ZMQDisplayHook'""")
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location=Unicode(config=True,
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help="""The location (an IP address) of the controller. This is
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used for disambiguating URLs, to determine whether
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loopback should be used to connect or the public address.""")
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timeout=Float(5.0, config=True,
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help="""The time (in seconds) to wait for the Controller to respond
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to registration requests before giving up.""")
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max_heartbeat_misses=Integer(50, config=True,
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help="""The maximum number of times a check for the heartbeat ping of a
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controller can be missed before shutting down the engine.
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If set to 0, the check is disabled.""")
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sshserver=Unicode(config=True,
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help="""The SSH server to use for tunneling connections to the Controller.""")
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sshkey=Unicode(config=True,
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help="""The SSH private key file to use when tunneling connections to the Controller.""")
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paramiko=Bool(sys.platform == 'win32', config=True,
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help="""Whether to use paramiko instead of openssh for tunnels.""")
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@property
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def tunnel_mod(self):
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from zmq.ssh import tunnel
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return tunnel
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# not configurable:
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connection_info = Dict()
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user_ns = Dict()
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id = Integer(allow_none=True)
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registrar = Instance('zmq.eventloop.zmqstream.ZMQStream')
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kernel = Instance(Kernel)
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hb_check_period=Integer()
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# States for the heartbeat monitoring
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# Initial values for monitored and pinged must satisfy "monitored > pinged == False" so that
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# during the first check no "missed" ping is reported. Must be floats for Python 3 compatibility.
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_hb_last_pinged = 0.0
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_hb_last_monitored = 0.0
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_hb_missed_beats = 0
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# The zmq Stream which receives the pings from the Heart
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_hb_listener = None
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bident = CBytes()
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ident = Unicode()
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def _ident_changed(self, name, old, new):
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self.bident = cast_bytes(new)
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using_ssh=Bool(False)
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def __init__(self, **kwargs):
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super(EngineFactory, self).__init__(**kwargs)
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self.ident = self.session.session
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def init_connector(self):
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"""construct connection function, which handles tunnels."""
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self.using_ssh = bool(self.sshkey or self.sshserver)
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if self.sshkey and not self.sshserver:
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# We are using ssh directly to the controller, tunneling localhost to localhost
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self.sshserver = self.url.split('://')[1].split(':')[0]
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if self.using_ssh:
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if self.tunnel_mod.try_passwordless_ssh(self.sshserver, self.sshkey, self.paramiko):
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password=False
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else:
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password = getpass("SSH Password for %s: "%self.sshserver)
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else:
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password = False
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def connect(s, url):
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url = disambiguate_url(url, self.location)
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if self.using_ssh:
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self.log.debug("Tunneling connection to %s via %s", url, self.sshserver)
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return self.tunnel_mod.tunnel_connection(s, url, self.sshserver,
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keyfile=self.sshkey, paramiko=self.paramiko,
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password=password,
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)
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else:
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return s.connect(url)
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def maybe_tunnel(url):
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"""like connect, but don't complete the connection (for use by heartbeat)"""
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url = disambiguate_url(url, self.location)
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if self.using_ssh:
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self.log.debug("Tunneling connection to %s via %s", url, self.sshserver)
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url, tunnelobj = self.tunnel_mod.open_tunnel(url, self.sshserver,
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keyfile=self.sshkey, paramiko=self.paramiko,
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password=password,
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)
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return str(url)
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return connect, maybe_tunnel
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def register(self):
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"""send the registration_request"""
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self.log.info("Registering with controller at %s"%self.url)
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ctx = self.context
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connect,maybe_tunnel = self.init_connector()
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reg = ctx.socket(zmq.DEALER)
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reg.setsockopt(zmq.IDENTITY, self.bident)
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connect(reg, self.url)
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self.registrar = zmqstream.ZMQStream(reg, self.loop)
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content = dict(uuid=self.ident)
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self.registrar.on_recv(lambda msg: self.complete_registration(msg, connect, maybe_tunnel))
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# print (self.session.key)
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self.session.send(self.registrar, "registration_request", content=content)
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def _report_ping(self, msg):
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"""Callback for when the heartmonitor.Heart receives a ping"""
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#self.log.debug("Received a ping: %s", msg)
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self._hb_last_pinged = time.time()
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def complete_registration(self, msg, connect, maybe_tunnel):
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# print msg
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self.loop.remove_timeout(self._abort_timeout)
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ctx = self.context
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loop = self.loop
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identity = self.bident
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idents,msg = self.session.feed_identities(msg)
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msg = self.session.deserialize(msg)
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content = msg['content']
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info = self.connection_info
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def url(key):
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"""get zmq url for given channel"""
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return str(info["interface"] + ":%i" % info[key])
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if content['status'] == 'ok':
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self.id = int(content['id'])
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# launch heartbeat
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# possibly forward hb ports with tunnels
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hb_ping = maybe_tunnel(url('hb_ping'))
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hb_pong = maybe_tunnel(url('hb_pong'))
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hb_monitor = None
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if self.max_heartbeat_misses > 0:
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# Add a monitor socket which will record the last time a ping was seen
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mon = self.context.socket(zmq.SUB)
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mport = mon.bind_to_random_port('tcp://%s' % localhost())
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mon.setsockopt(zmq.SUBSCRIBE, b"")
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self._hb_listener = zmqstream.ZMQStream(mon, self.loop)
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self._hb_listener.on_recv(self._report_ping)
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hb_monitor = "tcp://%s:%i" % (localhost(), mport)
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heart = Heart(hb_ping, hb_pong, hb_monitor , heart_id=identity)
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heart.start()
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# create Shell Connections (MUX, Task, etc.):
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shell_addrs = url('mux'), url('task')
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# Use only one shell stream for mux and tasks
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stream = zmqstream.ZMQStream(ctx.socket(zmq.ROUTER), loop)
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stream.setsockopt(zmq.IDENTITY, identity)
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shell_streams = [stream]
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for addr in shell_addrs:
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connect(stream, addr)
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# control stream:
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control_addr = url('control')
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control_stream = zmqstream.ZMQStream(ctx.socket(zmq.ROUTER), loop)
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control_stream.setsockopt(zmq.IDENTITY, identity)
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connect(control_stream, control_addr)
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# create iopub stream:
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iopub_addr = url('iopub')
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iopub_socket = ctx.socket(zmq.PUB)
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iopub_socket.setsockopt(zmq.IDENTITY, identity)
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connect(iopub_socket, iopub_addr)
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# disable history:
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self.config.HistoryManager.hist_file = ':memory:'
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# Redirect input streams and set a display hook.
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if self.out_stream_factory:
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sys.stdout = self.out_stream_factory(self.session, iopub_socket, u'stdout')
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sys.stdout.topic = cast_bytes('engine.%i.stdout' % self.id)
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sys.stderr = self.out_stream_factory(self.session, iopub_socket, u'stderr')
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sys.stderr.topic = cast_bytes('engine.%i.stderr' % self.id)
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if self.display_hook_factory:
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sys.displayhook = self.display_hook_factory(self.session, iopub_socket)
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sys.displayhook.topic = cast_bytes('engine.%i.execute_result' % self.id)
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self.kernel = Kernel(parent=self, int_id=self.id, ident=self.ident, session=self.session,
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control_stream=control_stream, shell_streams=shell_streams, iopub_socket=iopub_socket,
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loop=loop, user_ns=self.user_ns, log=self.log)
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self.kernel.shell.display_pub.topic = cast_bytes('engine.%i.displaypub' % self.id)
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# periodically check the heartbeat pings of the controller
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# Should be started here and not in "start()" so that the right period can be taken
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# from the hubs HeartBeatMonitor.period
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if self.max_heartbeat_misses > 0:
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# Use a slightly bigger check period than the hub signal period to not warn unnecessary
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self.hb_check_period = int(content['hb_period'])+10
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self.log.info("Starting to monitor the heartbeat signal from the hub every %i ms." , self.hb_check_period)
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self._hb_reporter = ioloop.PeriodicCallback(self._hb_monitor, self.hb_check_period, self.loop)
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self._hb_reporter.start()
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else:
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self.log.info("Monitoring of the heartbeat signal from the hub is not enabled.")
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# FIXME: This is a hack until IPKernelApp and IPEngineApp can be fully merged
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app = IPKernelApp(parent=self, shell=self.kernel.shell, kernel=self.kernel, log=self.log)
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app.init_profile_dir()
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app.init_code()
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self.kernel.start()
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else:
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self.log.fatal("Registration Failed: %s"%msg)
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raise Exception("Registration Failed: %s"%msg)
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self.log.info("Completed registration with id %i"%self.id)
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def abort(self):
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self.log.fatal("Registration timed out after %.1f seconds"%self.timeout)
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if self.url.startswith('127.'):
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self.log.fatal("""
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If the controller and engines are not on the same machine,
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you will have to instruct the controller to listen on an external IP (in ipcontroller_config.py):
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c.HubFactory.ip='*' # for all interfaces, internal and external
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c.HubFactory.ip='192.168.1.101' # or any interface that the engines can see
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or tunnel connections via ssh.
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""")
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self.session.send(self.registrar, "unregistration_request", content=dict(id=self.id))
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time.sleep(1)
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sys.exit(255)
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def _hb_monitor(self):
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"""Callback to monitor the heartbeat from the controller"""
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self._hb_listener.flush()
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if self._hb_last_monitored > self._hb_last_pinged:
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self._hb_missed_beats += 1
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self.log.warn("No heartbeat in the last %s ms (%s time(s) in a row).", self.hb_check_period, self._hb_missed_beats)
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else:
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#self.log.debug("Heartbeat received (after missing %s beats).", self._hb_missed_beats)
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self._hb_missed_beats = 0
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if self._hb_missed_beats >= self.max_heartbeat_misses:
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self.log.fatal("Maximum number of heartbeats misses reached (%s times %s ms), shutting down.",
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self.max_heartbeat_misses, self.hb_check_period)
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self.session.send(self.registrar, "unregistration_request", content=dict(id=self.id))
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self.loop.stop()
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self._hb_last_monitored = time.time()
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def start(self):
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loop = self.loop
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def _start():
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self.register()
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self._abort_timeout = loop.add_timeout(loop.time() + self.timeout, self.abort)
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self.loop.add_callback(_start)
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