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""" A minimal application base mixin for all ZMQ based IPython frontends.
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This is not a complete console app, as subprocess will not be able to receive
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input, there is no real readline support, among other limitations. This is a
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refactoring of what used to be the IPython/qt/console/qtconsoleapp.py
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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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import atexit
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import os
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import signal
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import sys
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import uuid
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from IPython.config.application import boolean_flag
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from IPython.core.profiledir import ProfileDir
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from IPython.kernel.blocking import BlockingKernelClient
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from IPython.kernel import KernelManager
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from IPython.kernel import tunnel_to_kernel, find_connection_file
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from IPython.kernel.kernelspec import NoSuchKernel
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from IPython.utils.path import filefind
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from IPython.utils.traitlets import (
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Dict, List, Unicode, CUnicode, CBool, Any
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)
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from IPython.kernel.zmq.session import Session
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from IPython.kernel.connect import ConnectionFileMixin
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from IPython.utils.localinterfaces import localhost
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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flags = {}
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# the flags that are specific to the frontend
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# these must be scrubbed before being passed to the kernel,
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# or it will raise an error on unrecognized flags
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app_flags = {
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'existing' : ({'IPythonConsoleApp' : {'existing' : 'kernel*.json'}},
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"Connect to an existing kernel. If no argument specified, guess most recent"),
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}
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app_flags.update(boolean_flag(
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'confirm-exit', 'IPythonConsoleApp.confirm_exit',
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"""Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
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to force a direct exit without any confirmation.
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""",
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"""Don't prompt the user when exiting. This will terminate the kernel
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if it is owned by the frontend, and leave it alive if it is external.
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"""
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))
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flags.update(app_flags)
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aliases = {}
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# also scrub aliases from the frontend
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app_aliases = dict(
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ip = 'IPythonConsoleApp.ip',
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transport = 'IPythonConsoleApp.transport',
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hb = 'IPythonConsoleApp.hb_port',
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shell = 'IPythonConsoleApp.shell_port',
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iopub = 'IPythonConsoleApp.iopub_port',
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stdin = 'IPythonConsoleApp.stdin_port',
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existing = 'IPythonConsoleApp.existing',
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f = 'IPythonConsoleApp.connection_file',
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kernel = 'IPythonConsoleApp.kernel_name',
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ssh = 'IPythonConsoleApp.sshserver',
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)
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aliases.update(app_aliases)
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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classes = [KernelManager, ProfileDir, Session]
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class IPythonConsoleApp(ConnectionFileMixin):
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name = 'ipython-console-mixin'
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description = """
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The IPython Mixin Console.
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This class contains the common portions of console client (QtConsole,
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ZMQ-based terminal console, etc). It is not a full console, in that
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launched terminal subprocesses will not be able to accept input.
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The Console using this mixing supports various extra features beyond
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the single-process Terminal IPython shell, such as connecting to
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existing kernel, via:
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ipython <appname> --existing
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as well as tunnel via SSH
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"""
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classes = classes
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flags = Dict(flags)
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aliases = Dict(aliases)
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kernel_manager_class = KernelManager
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kernel_client_class = BlockingKernelClient
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kernel_argv = List(Unicode)
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# frontend flags&aliases to be stripped when building kernel_argv
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frontend_flags = Any(app_flags)
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frontend_aliases = Any(app_aliases)
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# create requested profiles by default, if they don't exist:
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auto_create = CBool(True)
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# connection info:
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sshserver = Unicode('', config=True,
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help="""The SSH server to use to connect to the kernel.""")
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sshkey = Unicode('', config=True,
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help="""Path to the ssh key to use for logging in to the ssh server.""")
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def _connection_file_default(self):
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return 'kernel-%i.json' % os.getpid()
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existing = CUnicode('', config=True,
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help="""Connect to an already running kernel""")
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kernel_name = Unicode('python', config=True,
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help="""The name of the default kernel to start.""")
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confirm_exit = CBool(True, config=True,
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help="""
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Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
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to force a direct exit without any confirmation.""",
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)
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def build_kernel_argv(self, argv=None):
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"""build argv to be passed to kernel subprocess
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Override in subclasses if any args should be passed to the kernel
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"""
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self.kernel_argv = self.extra_args
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def init_connection_file(self):
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"""find the connection file, and load the info if found.
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The current working directory and the current 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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When attempting to connect to an existing kernel and the `--existing`
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argument does not match an existing file, it will be interpreted as a
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fileglob, and the matching file in the current profile's security dir
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with the latest access time will be used.
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After this method is called, self.connection_file contains the *full path*
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to the connection file, never just its name.
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"""
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if self.existing:
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try:
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cf = find_connection_file(self.existing)
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except Exception:
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self.log.critical("Could not find existing kernel connection file %s", self.existing)
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self.exit(1)
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self.log.debug("Connecting to existing kernel: %s" % cf)
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self.connection_file = cf
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else:
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# not existing, check if we are going to write the file
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# and ensure that self.connection_file is a full path, not just the shortname
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try:
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cf = find_connection_file(self.connection_file)
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except Exception:
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# file might not exist
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if self.connection_file == os.path.basename(self.connection_file):
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# just shortname, put it in security dir
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cf = os.path.join(self.profile_dir.security_dir, self.connection_file)
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else:
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cf = self.connection_file
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self.connection_file = cf
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try:
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self.connection_file = filefind(self.connection_file, ['.', self.profile_dir.security_dir])
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except IOError:
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self.log.debug("Connection File not found: %s", self.connection_file)
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return
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# should load_connection_file only be used for existing?
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# as it is now, this allows reusing ports if an existing
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# file is requested
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try:
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self.load_connection_file()
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except Exception:
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self.log.error("Failed to load connection file: %r", self.connection_file, exc_info=True)
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self.exit(1)
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def init_ssh(self):
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"""set up ssh tunnels, if needed."""
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if not self.existing or (not self.sshserver and not self.sshkey):
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return
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self.load_connection_file()
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transport = self.transport
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ip = self.ip
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if transport != 'tcp':
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self.log.error("Can only use ssh tunnels with TCP sockets, not %s", transport)
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sys.exit(-1)
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if self.sshkey and not self.sshserver:
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# specifying just the key implies that we are connecting directly
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self.sshserver = ip
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ip = localhost()
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# build connection dict for tunnels:
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info = dict(ip=ip,
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shell_port=self.shell_port,
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iopub_port=self.iopub_port,
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stdin_port=self.stdin_port,
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hb_port=self.hb_port
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)
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self.log.info("Forwarding connections to %s via %s"%(ip, self.sshserver))
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# tunnels return a new set of ports, which will be on localhost:
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self.ip = localhost()
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try:
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newports = tunnel_to_kernel(info, self.sshserver, self.sshkey)
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except:
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# even catch KeyboardInterrupt
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self.log.error("Could not setup tunnels", exc_info=True)
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self.exit(1)
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self.shell_port, self.iopub_port, self.stdin_port, self.hb_port = newports
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cf = self.connection_file
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base,ext = os.path.splitext(cf)
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base = os.path.basename(base)
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self.connection_file = os.path.basename(base)+'-ssh'+ext
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self.log.info("To connect another client via this tunnel, use:")
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self.log.info("--existing %s" % self.connection_file)
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def _new_connection_file(self):
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cf = ''
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while not cf:
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# we don't need a 128b id to distinguish kernels, use more readable
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# 48b node segment (12 hex chars). Users running more than 32k simultaneous
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# kernels can subclass.
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ident = str(uuid.uuid4()).split('-')[-1]
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cf = os.path.join(self.profile_dir.security_dir, 'kernel-%s.json' % ident)
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# only keep if it's actually new. Protect against unlikely collision
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# in 48b random search space
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cf = cf if not os.path.exists(cf) else ''
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return cf
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def init_kernel_manager(self):
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# Don't let Qt or ZMQ swallow KeyboardInterupts.
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if self.existing:
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self.kernel_manager = None
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return
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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# Create a KernelManager and start a kernel.
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try:
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self.kernel_manager = self.kernel_manager_class(
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ip=self.ip,
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session=self.session,
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transport=self.transport,
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shell_port=self.shell_port,
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iopub_port=self.iopub_port,
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stdin_port=self.stdin_port,
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hb_port=self.hb_port,
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connection_file=self.connection_file,
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kernel_name=self.kernel_name,
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parent=self,
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ipython_dir=self.ipython_dir,
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)
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except NoSuchKernel:
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self.log.critical("Could not find kernel %s", self.kernel_name)
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self.exit(1)
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self.kernel_manager.client_factory = self.kernel_client_class
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# FIXME: remove special treatment of IPython kernels
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kwargs = {}
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if self.kernel_manager.ipython_kernel:
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kwargs['extra_arguments'] = self.kernel_argv
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self.kernel_manager.start_kernel(**kwargs)
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atexit.register(self.kernel_manager.cleanup_ipc_files)
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if self.sshserver:
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# ssh, write new connection file
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self.kernel_manager.write_connection_file()
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# in case KM defaults / ssh writing changes things:
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km = self.kernel_manager
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self.shell_port=km.shell_port
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self.iopub_port=km.iopub_port
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self.stdin_port=km.stdin_port
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self.hb_port=km.hb_port
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self.connection_file = km.connection_file
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atexit.register(self.kernel_manager.cleanup_connection_file)
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def init_kernel_client(self):
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if self.kernel_manager is not None:
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self.kernel_client = self.kernel_manager.client()
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else:
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self.kernel_client = self.kernel_client_class(
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session=self.session,
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ip=self.ip,
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transport=self.transport,
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shell_port=self.shell_port,
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iopub_port=self.iopub_port,
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stdin_port=self.stdin_port,
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hb_port=self.hb_port,
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connection_file=self.connection_file,
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parent=self,
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)
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self.kernel_client.start_channels()
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def initialize(self, argv=None):
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"""
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Classes which mix this class in should call:
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IPythonConsoleApp.initialize(self,argv)
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"""
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self.init_connection_file()
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self.init_ssh()
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self.init_kernel_manager()
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self.init_kernel_client()
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