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""" Defines helper functions for creating kernel entry points and process
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launchers.
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"""
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# Standard library imports.
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import socket
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from subprocess import Popen
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import sys
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# System library imports.
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import zmq
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# Local imports.
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from IPython.core.ultratb import FormattedTB
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from IPython.external.argparse import ArgumentParser
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from IPython.utils import io
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from exitpoller import ExitPollerUnix, ExitPollerWindows
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from displayhook import DisplayHook
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from iostream import OutStream
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from session import Session
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def bind_port(socket, ip, port):
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""" Binds the specified ZMQ socket. If the port is zero, a random port is
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chosen. Returns the port that was bound.
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"""
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connection = 'tcp://%s' % ip
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if port <= 0:
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port = socket.bind_to_random_port(connection)
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else:
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connection += ':%i' % port
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socket.bind(connection)
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return port
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def make_argument_parser():
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""" Creates an ArgumentParser for the generic arguments supported by all
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kernel entry points.
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"""
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parser = ArgumentParser()
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parser.add_argument('--ip', type=str, default='127.0.0.1',
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help='set the kernel\'s IP address [default: local]')
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parser.add_argument('--xrep', type=int, metavar='PORT', default=0,
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help='set the XREP channel port [default: random]')
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parser.add_argument('--pub', type=int, metavar='PORT', default=0,
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help='set the PUB channel port [default: random]')
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parser.add_argument('--req', type=int, metavar='PORT', default=0,
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help='set the REQ channel port [default: random]')
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if sys.platform == 'win32':
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parser.add_argument('--parent', type=int, metavar='HANDLE',
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default=0, help='kill this process if the process '
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'with HANDLE dies')
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else:
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parser.add_argument('--parent', action='store_true',
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help='kill this process if its parent dies')
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return parser
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def make_kernel(namespace, kernel_factory,
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out_stream_factory=None, display_hook_factory=None):
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""" Creates a kernel.
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"""
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# Install minimal exception handling
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sys.excepthook = FormattedTB(mode='Verbose', ostream=sys.__stdout__)
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# Create a context, a session, and the kernel sockets.
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io.rprint("Starting the kernel...")
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context = zmq.Context()
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session = Session(username=u'kernel')
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reply_socket = context.socket(zmq.XREP)
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xrep_port = bind_port(reply_socket, namespace.ip, namespace.xrep)
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io.rprint("XREP Channel on port", xrep_port)
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pub_socket = context.socket(zmq.PUB)
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pub_port = bind_port(pub_socket, namespace.ip, namespace.pub)
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io.rprint("PUB Channel on port", pub_port)
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req_socket = context.socket(zmq.XREQ)
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req_port = bind_port(req_socket, namespace.ip, namespace.req)
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io.rprint("REQ Channel on port", req_port)
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# Redirect input streams and set a display hook.
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if out_stream_factory:
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sys.stdout = out_stream_factory(session, pub_socket, u'stdout')
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sys.stderr = out_stream_factory(session, pub_socket, u'stderr')
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if display_hook_factory:
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sys.displayhook = display_hook_factory(session, pub_socket)
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# Create the kernel.
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return kernel_factory(session=session, reply_socket=reply_socket,
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pub_socket=pub_socket, req_socket=req_socket)
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def start_kernel(namespace, kernel):
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""" Starts a kernel.
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"""
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# Configure this kernel/process to die on parent termination, if necessary.
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if namespace.parent:
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if sys.platform == 'win32':
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poller = ExitPollerWindows(namespace.parent)
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else:
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poller = ExitPollerUnix()
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poller.start()
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# Start the kernel mainloop.
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kernel.start()
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def make_default_main(kernel_factory):
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""" Creates the simplest possible kernel entry point.
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"""
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def main():
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namespace = make_argument_parser().parse_args()
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kernel = make_kernel(namespace, kernel_factory, OutStream, DisplayHook)
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start_kernel(namespace, kernel)
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return main
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def base_launch_kernel(code, xrep_port=0, pub_port=0, req_port=0,
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independent=False, extra_arguments=[]):
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""" Launches a localhost kernel, binding to the specified ports.
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Parameters
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----------
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code : str,
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A string of Python code that imports and executes a kernel entry point.
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xrep_port : int, optional
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The port to use for XREP channel.
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pub_port : int, optional
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The port to use for the SUB channel.
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req_port : int, optional
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The port to use for the REQ (raw input) channel.
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independent : bool, optional (default False)
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If set, the kernel process is guaranteed to survive if this process
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dies. If not set, an effort is made to ensure that the kernel is killed
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when this process dies. Note that in this case it is still good practice
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to kill kernels manually before exiting.
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extra_arguments = list, optional
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A list of extra arguments to pass when executing the launch code.
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Returns
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-------
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A tuple of form:
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(kernel_process, xrep_port, pub_port, req_port)
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where kernel_process is a Popen object and the ports are integers.
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"""
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# Find open ports as necessary.
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ports = []
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ports_needed = int(xrep_port <= 0) + int(pub_port <= 0) + int(req_port <= 0)
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for i in xrange(ports_needed):
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sock = socket.socket()
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sock.bind(('', 0))
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ports.append(sock)
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for i, sock in enumerate(ports):
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port = sock.getsockname()[1]
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sock.close()
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ports[i] = port
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if xrep_port <= 0:
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xrep_port = ports.pop(0)
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if pub_port <= 0:
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pub_port = ports.pop(0)
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if req_port <= 0:
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req_port = ports.pop(0)
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# Build the kernel launch command.
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arguments = [ sys.executable, '-c', code, '--xrep', str(xrep_port),
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'--pub', str(pub_port), '--req', str(req_port) ]
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arguments.extend(extra_arguments)
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# Spawn a kernel.
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if independent:
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if sys.platform == 'win32':
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proc = Popen(['start', '/b'] + arguments, shell=True)
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else:
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proc = Popen(arguments, preexec_fn=lambda: os.setsid())
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else:
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if sys.platform == 'win32':
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from _subprocess import DuplicateHandle, GetCurrentProcess, \
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DUPLICATE_SAME_ACCESS
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pid = GetCurrentProcess()
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handle = DuplicateHandle(pid, pid, pid, 0,
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True, # Inheritable by new processes.
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DUPLICATE_SAME_ACCESS)
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proc = Popen(arguments + ['--parent', str(int(handle))])
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else:
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proc = Popen(arguments + ['--parent'])
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return proc, xrep_port, pub_port, req_port
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