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# -*- coding: utf-8 -*-
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"""Frontend of ipython working with python-zmq
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Ipython's frontend, is a ipython interface that send request to kernel and proccess the kernel's outputs.
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For more details, see the ipython-zmq design
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010 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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from __future__ import print_function
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import __builtin__
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import sys
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import os
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from Queue import Empty
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import readline
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import rlcompleter
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#-----------------------------------------------------------------------------
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# Imports from ipython
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#-----------------------------------------------------------------------------
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from IPython.external.argparse import ArgumentParser
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from IPython.core.inputsplitter import IPythonInputSplitter
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from IPython.zmq.blockingkernelmanager import BlockingKernelManager as KernelManager
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from IPython.frontend.terminal.console.completer import ClientCompleter2p
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#-----------------------------------------------------------------------------
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# Network Constants
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#-----------------------------------------------------------------------------
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from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS
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class Frontend(object):
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"""This class is a simple frontend to ipython-zmq
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NOTE: this class uses kernelmanager to manipulate sockets
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Parameters:
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-----------
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kernelmanager : object
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instantiated object from class KernelManager in module kernelmanager
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"""
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def __init__(self, kernelmanager):
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self.km = kernelmanager
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self.session_id = self.km.session.session
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self.completer = ClientCompleter2p(self, self.km)
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readline.parse_and_bind("tab: complete")
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readline.parse_and_bind('set show-all-if-ambiguous on')
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readline.set_completer(self.completer.complete)
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history_path = os.path.expanduser('~/.ipython/history')
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if os.path.isfile(history_path):
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rlcompleter.readline.read_history_file(history_path)
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else:
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print("history file cannot be read.")
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self.messages = {}
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self._splitter = IPythonInputSplitter()
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self.code = ""
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self.prompt_count = 0
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self._get_initial_prompt()
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def _get_initial_prompt(self):
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self._execute('', hidden=True)
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def interact(self):
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"""Gets input from console using inputsplitter, then
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while you enter code it can indent and set index id to any input
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"""
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try:
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print()
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self._splitter.push(raw_input('In [%i]: '%self.prompt_count+self.code))
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while self._splitter.push_accepts_more():
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self.code = raw_input('.....: '+' '*self._splitter.indent_spaces)
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self._splitter.push(' '*self._splitter.indent_spaces+self.code)
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self._execute(self._splitter.source,False)
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self._splitter.reset()
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except KeyboardInterrupt:
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print('\nKeyboardInterrupt\n')
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pass
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def start(self):
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"""Start the interaction loop, calling the .interact() method for each
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input cell.
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"""
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while True:
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try:
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self.interact()
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except KeyboardInterrupt:
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print('\nKeyboardInterrupt\n')
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pass
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except EOFError:
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answer = ''
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while True:
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answer = raw_input('\nDo you really want to exit ([y]/n)?')
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if answer == 'y' or answer == '' :
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self.km.shutdown_kernel()
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sys.exit()
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elif answer == 'n':
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break
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def _execute(self, source, hidden = True):
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""" Execute 'source'. If 'hidden', do not show any output.
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See parent class :meth:`execute` docstring for full details.
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"""
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msg_id = self.km.shell_channel.execute(source, hidden)
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while not self.km.shell_channel.msg_ready():
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try:
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self.handle_stdin_channel(timeout=0.1)
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except Empty:
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pass
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self.handle_execute_reply(msg_id)
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def handle_execute_reply(self, msg_id):
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msg = self.km.shell_channel.get_msg()
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if msg["parent_header"]["msg_id"] == msg_id:
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if msg["content"]["status"] == 'ok' :
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self.handle_sub_channel()
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elif msg["content"]["status"] == 'error':
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for frame in msg["content"]["traceback"]:
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print(frame, file=sys.stderr)
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self.prompt_count = msg["content"]["execution_count"] + 1
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def handle_sub_channel(self):
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""" Method to procces subscribe channel's messages
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This method reads a message and processes the content in different
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outputs like stdout, stderr, pyout and status
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Arguments:
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sub_msg: message receive from kernel in the sub socket channel
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capture by kernel manager.
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"""
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while self.km.sub_channel.msg_ready():
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sub_msg = self.km.sub_channel.get_msg()
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if self.session_id == sub_msg['parent_header']['session']:
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if sub_msg['msg_type'] == 'status' :
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if sub_msg["content"]["execution_state"] == "busy" :
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pass
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elif sub_msg['msg_type'] == 'stream' :
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if sub_msg["content"]["name"] == "stdout":
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print(sub_msg["content"]["data"], file=sys.stdout, end="")
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sys.stdout.flush()
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elif sub_msg["content"]["name"] == "stderr" :
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print(sub_msg["content"]["data"], file=sys.stderr, end="")
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sys.stderr.flush()
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elif sub_msg['msg_type'] == 'pyout' :
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print("Out[%i]:"%sub_msg["content"]["execution_count"],
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sub_msg["content"]["data"]["text/plain"],
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file=sys.stdout)
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sys.stdout.flush()
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def handle_stdin_channel(self, timeout=0.1):
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""" Method to capture raw_input
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"""
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msg_rep = self.km.stdin_channel.get_msg(timeout=timeout)
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if self.session_id == msg_rep["parent_header"]["session"] :
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raw_data = raw_input(msg_rep["content"]["prompt"])
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self.km.stdin_channel.input(raw_data)
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def start_frontend():
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""" Entry point for application.
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"""
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# Parse command line arguments.
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parser = ArgumentParser()
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kgroup = parser.add_argument_group('kernel options')
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kgroup.add_argument('-e', '--existing', action='store_true',
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help='connect to an existing kernel')
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kgroup.add_argument('--ip', type=str, default=LOCALHOST,
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help=\
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"set the kernel\'s IP address [default localhost].\
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If the IP address is something other than localhost, then \
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Consoles on other machines will be able to connect\
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to the Kernel, so be careful!")
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kgroup.add_argument('--shell', type=int, metavar='PORT', default=0,
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help='set the XREQ channel port [default random]')
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kgroup.add_argument('--iopub', type=int, metavar='PORT', default=0,
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help='set the SUB channel port [default random]')
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kgroup.add_argument('--stdin', type=int, metavar='PORT', default=0,
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help='set the REP channel port [default random]')
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kgroup.add_argument('--hb', type=int, metavar='PORT', default=0,
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help='set the heartbeat port [default random]')
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egroup = kgroup.add_mutually_exclusive_group()
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egroup.add_argument('--pure', action='store_true', help = \
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'use a pure Python kernel instead of an IPython kernel')
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egroup.add_argument('--pylab', type=str, metavar='GUI', nargs='?',
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const='auto', help = \
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"Pre-load matplotlib and numpy for interactive use. If GUI is not \
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given, the GUI backend is matplotlib's, otherwise use one of: \
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['tk', 'gtk', 'qt', 'wx', 'inline'].")
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egroup.add_argument('--colors', type=str,
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help="Set the color scheme (LightBG,Linux,NoColor). This is guessed\
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based on the pygments style if not set.")
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args = parser.parse_args()
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# parse the colors arg down to current known labels
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if args.colors:
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colors=args.colors.lower()
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if colors in ('lightbg', 'light'):
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colors='lightbg'
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elif colors in ('dark', 'linux'):
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colors='linux'
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else:
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colors='nocolor'
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else:
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colors=None
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# Create a KernelManager and start a kernel.
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kernel_manager = KernelManager(shell_address=(args.ip, args.shell),
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sub_address=(args.ip, args.iopub),
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stdin_address=(args.ip, args.stdin),
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hb_address=(args.ip, args.hb))
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if not args.existing:
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# if not args.ip in LOCAL_IPS+ALL_ALIAS:
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# raise ValueError("Must bind a local ip, such as: %s"%LOCAL_IPS)
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kwargs = dict(ip=args.ip, ipython=True)
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kernel_manager.start_kernel(**kwargs)
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kernel_manager.start_channels()
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frontend=Frontend(kernel_manager)
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return frontend
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if __name__ == "__main__" :
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frontend=start_frontend()
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frontend.start()
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