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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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# Standard library imports.
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import __builtin__
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from code import CommandCompiler
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import os
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import sys
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import time
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import traceback
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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.config.configurable import Configurable
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from IPython.zmq.zmqshell import ZMQInteractiveShell
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from IPython.external.argparse import ArgumentParser
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from IPython.utils.traitlets import Instance
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from IPython.zmq.session import Session, Message
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from completer import KernelCompleter
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from iostream import OutStream
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from displayhook import DisplayHook
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from exitpoller import ExitPollerUnix, ExitPollerWindows
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#-----------------------------------------------------------------------------
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# Main kernel class
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#-----------------------------------------------------------------------------
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class Kernel(Configurable):
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
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session = Instance('IPython.zmq.session.Session')
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reply_socket = Instance('zmq.Socket')
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pub_socket = Instance('zmq.Socket')
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req_socket = Instance('zmq.Socket')
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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 = ZMQInteractiveShell.instance()
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self.shell.displayhook.session = self.session
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self.shell.displayhook.pub_socket = self.pub_socket
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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' ]
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self.handlers = {}
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for msg_type in msg_types:
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self.handlers[msg_type] = getattr(self, msg_type)
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def abort_queue(self):
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while True:
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try:
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ident = self.reply_socket.recv(zmq.NOBLOCK)
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except zmq.ZMQError, e:
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if e.errno == zmq.EAGAIN:
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break
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else:
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assert self.reply_socket.rcvmore(), "Unexpected missing message part."
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msg = self.reply_socket.recv_json()
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print>>sys.__stdout__, "Aborting:"
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print>>sys.__stdout__, Message(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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print>>sys.__stdout__, Message(reply_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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# 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(0.1)
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def execute_request(self, ident, 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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print>>sys.__stderr__, "Got bad msg: "
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print>>sys.__stderr__, Message(parent)
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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.pub_socket.send_json(pyin_msg)
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try:
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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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raw_input = lambda prompt='': self.raw_input(prompt, ident, parent)
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__builtin__.raw_input = raw_input
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# Set the parent message of the display hook.
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self.shell.displayhook.set_parent(parent)
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self.shell.runlines(code)
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# exec comp_code in self.user_ns, self.user_ns
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except:
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etype, evalue, tb = sys.exc_info()
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tb = traceback.format_exception(etype, evalue, tb)
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exc_content = {
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u'status' : u'error',
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u'traceback' : tb,
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u'ename' : unicode(etype.__name__),
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u'evalue' : unicode(evalue)
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}
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exc_msg = self.session.msg(u'pyerr', exc_content, parent)
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self.pub_socket.send_json(exc_msg)
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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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# Flush output before sending the reply.
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sys.stderr.flush()
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sys.stdout.flush()
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# Send the reply.
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reply_msg = self.session.msg(u'execute_reply', reply_content, parent)
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print>>sys.__stdout__, Message(reply_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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if reply_msg['content']['status'] == u'error':
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self.abort_queue()
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def raw_input(self, prompt, ident, parent):
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# Flush output before making the request.
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sys.stderr.flush()
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sys.stdout.flush()
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# Send the input request.
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content = dict(prompt=prompt)
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msg = self.session.msg(u'input_request', content, parent)
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self.req_socket.send_json(msg)
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# Await a response.
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reply = self.req_socket.recv_json()
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try:
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value = reply['content']['value']
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except:
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print>>sys.__stderr__, "Got bad raw_input reply: "
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print>>sys.__stderr__, Message(parent)
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value = ''
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return value
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def complete_request(self, 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(self.reply_socket, '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.shell.complete(msg.content.line)
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def object_info_request(self, ident, parent):
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context = parent['content']['oname'].split('.')
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object_info = self.object_info(context)
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msg = self.session.send(self.reply_socket, 'object_info_reply',
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object_info, parent, ident)
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print >> sys.__stdout__, msg
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def object_info(self, context):
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symbol, leftover = self.symbol_from_context(context)
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if symbol is not None and not leftover:
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doc = getattr(symbol, '__doc__', '')
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else:
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doc = ''
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object_info = dict(docstring = doc)
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return object_info
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def symbol_from_context(self, context):
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if not context:
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return None, context
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base_symbol_string = context[0]
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symbol = self.shell.user_ns.get(base_symbol_string, None)
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if symbol is None:
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symbol = __builtin__.__dict__.get(base_symbol_string, None)
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if symbol is None:
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return None, context
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context = context[1:]
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for i, name in enumerate(context):
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new_symbol = getattr(symbol, name, None)
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if new_symbol is None:
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return symbol, context[i:]
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else:
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symbol = new_symbol
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return symbol, []
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def start(self):
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while True:
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ident = self.reply_socket.recv()
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assert self.reply_socket.rcvmore(), "Missing message part."
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msg = self.reply_socket.recv_json()
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omsg = Message(msg)
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print>>sys.__stdout__
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print>>sys.__stdout__, omsg
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handler = self.handlers.get(omsg.msg_type, None)
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if handler is None:
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print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg
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else:
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handler(ident, omsg)
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#-----------------------------------------------------------------------------
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# Kernel main and launch functions
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#-----------------------------------------------------------------------------
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def bind_port(socket, ip, port):
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""" Binds the specified ZMQ socket. If the port is less than zero, a random
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port is 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 main():
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""" Main entry point for launching a kernel.
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"""
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# Parse command line arguments.
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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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namespace = parser.parse_args()
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# Create a context, a session, and the kernel sockets.
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print >>sys.__stdout__, "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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print >>sys.__stdout__, "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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print >>sys.__stdout__, "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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print >>sys.__stdout__, "REQ Channel on port", req_port
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# Redirect input streams. This needs to be done before the Kernel is done
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# because currently the Kernel creates a ZMQInteractiveShell, which
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# holds references to sys.stdout and sys.stderr.
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sys.stdout = OutStream(session, pub_socket, u'stdout')
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sys.stderr = OutStream(session, pub_socket, u'stderr')
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# Create the kernel.
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kernel = Kernel(
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session=session, reply_socket=reply_socket,
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pub_socket=pub_socket, req_socket=req_socket
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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 launch_kernel(xrep_port=0, pub_port=0, req_port=0, independent=False):
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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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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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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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import socket
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from subprocess import Popen
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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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# Spawn a kernel.
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command = 'from IPython.zmq.ipkernel import main; main()'
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arguments = [ sys.executable, '-c', command, '--xrep', str(xrep_port),
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'--pub', str(pub_port), '--req', str(req_port) ]
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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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if __name__ == '__main__':
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main()
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