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"""Utilities for connecting to kernels
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Authors:
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* Min Ragan-Kelley
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 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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import glob
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import json
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import os
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import sys
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from getpass import getpass
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from subprocess import Popen, PIPE
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# external imports
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from IPython.external.ssh import tunnel
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# IPython imports
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from IPython.core.profiledir import ProfileDir
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from IPython.utils.path import filefind, get_ipython_dir
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from IPython.utils.py3compat import str_to_bytes
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#-----------------------------------------------------------------------------
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# Functions
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#-----------------------------------------------------------------------------
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def get_connection_file(app=None):
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"""Return the path to the connection file of an app
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Parameters
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----------
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app : KernelApp instance [optional]
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If unspecified, the currently running app will be used
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"""
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if app is None:
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from IPython.zmq.kernelapp import KernelApp
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if not KernelApp.initialized():
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raise RuntimeError("app not specified, and not in a running Kernel")
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app = KernelApp.instance()
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return filefind(app.connection_file, ['.', app.profile_dir.security_dir])
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def find_connection_file(filename, profile=None):
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"""find a connection file, and return its absolute path.
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The current working directory and the profile's security
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directory will be searched for the file if it is not given by
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absolute path.
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If profile is unspecified, then the current running application's
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profile will be used, or 'default', if not run from IPython.
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If the argument does not match an existing file, it will be interpreted as a
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fileglob, and the matching file in the profile's security dir with
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the latest access time will be used.
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Parameters
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----------
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filename : str
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The connection file or fileglob to search for.
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profile : str [optional]
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The name of the profile to use when searching for the connection file,
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if different from the current IPython session or 'default'.
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Returns
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-------
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str : The absolute path of the connection file.
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"""
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from IPython.core.application import BaseIPythonApplication as IPApp
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try:
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# quick check for absolute path, before going through logic
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return filefind(filename)
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except IOError:
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pass
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if profile is None:
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# profile unspecified, check if running from an IPython app
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if IPApp.initialized():
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app = IPApp.instance()
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profile_dir = app.profile_dir
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else:
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# not running in IPython, use default profile
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profile_dir = ProfileDir.find_profile_dir_by_name(get_ipython_dir(), 'default')
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else:
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# find profiledir by profile name:
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profile_dir = ProfileDir.find_profile_dir_by_name(get_ipython_dir(), profile)
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security_dir = profile_dir.security_dir
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try:
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# first, try explicit name
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return filefind(filename, ['.', security_dir])
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except IOError:
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pass
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# not found by full name
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if '*' in filename:
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# given as a glob already
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pat = filename
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else:
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# accept any substring match
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pat = '*%s*' % filename
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matches = glob.glob( os.path.join(security_dir, pat) )
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if not matches:
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raise IOError("Could not find %r in %r" % (filename, security_dir))
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elif len(matches) == 1:
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return matches[0]
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else:
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# get most recent match, by access time:
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return sorted(matches, key=lambda f: os.stat(f).st_atime)[-1]
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def get_connection_info(connection_file=None, unpack=False, profile=None):
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"""Return the connection information for the current Kernel.
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Parameters
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----------
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connection_file : str [optional]
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The connection file to be used. Can be given by absolute path, or
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IPython will search in the security directory of a given profile.
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If run from IPython,
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If unspecified, the connection file for the currently running
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IPython Kernel will be used, which is only allowed from inside a kernel.
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unpack : bool [default: False]
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if True, return the unpacked dict, otherwise just the string contents
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of the file.
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profile : str [optional]
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The name of the profile to use when searching for the connection file,
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if different from the current IPython session or 'default'.
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Returns
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-------
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The connection dictionary of the current kernel, as string or dict,
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depending on `unpack`.
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"""
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if connection_file is None:
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# get connection file from current kernel
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cf = get_connection_file()
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else:
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# connection file specified, allow shortnames:
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cf = find_connection_file(connection_file, profile=profile)
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with open(cf) as f:
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info = f.read()
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if unpack:
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info = json.loads(info)
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# ensure key is bytes:
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info['key'] = str_to_bytes(info.get('key', ''))
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return info
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def connect_qtconsole(connection_file=None, argv=None, profile=None):
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"""Connect a qtconsole to the current kernel.
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This is useful for connecting a second qtconsole to a kernel, or to a
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local notebook.
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Parameters
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----------
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connection_file : str [optional]
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The connection file to be used. Can be given by absolute path, or
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IPython will search in the security directory of a given profile.
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If run from IPython,
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If unspecified, the connection file for the currently running
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IPython Kernel will be used, which is only allowed from inside a kernel.
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argv : list [optional]
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Any extra args to be passed to the console.
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profile : str [optional]
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The name of the profile to use when searching for the connection file,
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if different from the current IPython session or 'default'.
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Returns
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-------
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subprocess.Popen instance running the qtconsole frontend
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"""
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argv = [] if argv is None else argv
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if connection_file is None:
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# get connection file from current kernel
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cf = get_connection_file()
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else:
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cf = find_connection_file(connection_file, profile=profile)
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cmd = ';'.join([
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"from IPython.frontend.qt.console import qtconsoleapp",
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"qtconsoleapp.main()"
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])
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return Popen([sys.executable, '-c', cmd, '--existing', cf] + argv, stdout=PIPE, stderr=PIPE)
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def tunnel_to_kernel(connection_info, sshserver, sshkey=None):
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"""tunnel connections to a kernel via ssh
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This will open four SSH tunnels from localhost on this machine to the
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ports associated with the kernel. They can be either direct
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localhost-localhost tunnels, or if an intermediate server is necessary,
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the kernel must be listening on a public IP.
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Parameters
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----------
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connection_info : dict or str (path)
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Either a connection dict, or the path to a JSON connection file
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sshserver : str
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The ssh sever to use to tunnel to the kernel. Can be a full
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`user@server:port` string. ssh config aliases are respected.
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sshkey : str [optional]
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Path to file containing ssh key to use for authentication.
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Only necessary if your ssh config does not already associate
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a keyfile with the host.
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Returns
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-------
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(shell, iopub, stdin, hb) : ints
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The four ports on localhost that have been forwarded to the kernel.
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"""
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if isinstance(connection_info, basestring):
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# it's a path, unpack it
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with open(connection_info) as f:
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connection_info = json.loads(f.read())
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cf = connection_info
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lports = tunnel.select_random_ports(4)
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rports = cf['shell_port'], cf['iopub_port'], cf['stdin_port'], cf['hb_port']
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remote_ip = cf['ip']
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if tunnel.try_passwordless_ssh(sshserver, sshkey):
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password=False
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else:
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password = getpass("SSH Password for %s: "%sshserver)
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for lp,rp in zip(lports, rports):
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tunnel.ssh_tunnel(lp, rp, sshserver, remote_ip, sshkey, password)
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return tuple(lports)
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def swallow_argv(argv, aliases=None, flags=None):
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"""strip frontend-specific aliases and flags from an argument list
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For use primarily in frontend apps that want to pass a subset of command-line
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arguments through to a subprocess, where frontend-specific flags and aliases
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should be removed from the list.
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Parameters
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----------
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argv : list(str)
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The starting argv, to be filtered
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aliases : container of aliases (dict, list, set, etc.)
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The frontend-specific aliases to be removed
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flags : container of flags (dict, list, set, etc.)
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The frontend-specific flags to be removed
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Returns
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-------
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argv : list(str)
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The argv list, excluding flags and aliases that have been stripped
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"""
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if aliases is None:
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aliases = set()
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if flags is None:
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flags = set()
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stripped = list(argv) # copy
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swallow_next = False
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was_flag = False
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for a in argv:
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if swallow_next:
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swallow_next = False
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# last arg was an alias, remove the next one
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# *unless* the last alias has a no-arg flag version, in which
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# case, don't swallow the next arg if it's also a flag:
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if not (was_flag and a.startswith('-')):
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stripped.remove(a)
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continue
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if a.startswith('-'):
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split = a.lstrip('-').split('=')
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alias = split[0]
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if alias in aliases:
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stripped.remove(a)
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if len(split) == 1:
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# alias passed with arg via space
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swallow_next = True
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# could have been a flag that matches an alias, e.g. `existing`
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# in which case, we might not swallow the next arg
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was_flag = alias in flags
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elif alias in flags and len(split) == 1:
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# strip flag, but don't swallow next, as flags don't take args
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stripped.remove(a)
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# return shortened list
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return stripped
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