""" A minimal application using the Qt console-style IPython frontend. This is not a complete console app, as subprocess will not be able to receive input, there is no real readline support, among other limitations. Authors: * Evan Patterson * Min RK * Erik Tollerud * Fernando Perez * Bussonnier Matthias * Thomas Kluyver """ #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- # stdlib imports import json import os import signal import sys import uuid # System library imports from IPython.external.qt import QtGui # Local imports from IPython.config.application import boolean_flag, catch_config_error from IPython.core.application import BaseIPythonApplication from IPython.core.profiledir import ProfileDir from IPython.lib.kernel import tunnel_to_kernel, find_connection_file from IPython.frontend.qt.console.frontend_widget import FrontendWidget from IPython.frontend.qt.console.ipython_widget import IPythonWidget from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget from IPython.frontend.qt.console import styles from IPython.frontend.qt.console.mainwindow import MainWindow from IPython.frontend.qt.kernelmanager import QtKernelManager from IPython.utils.path import filefind from IPython.utils.py3compat import str_to_bytes from IPython.utils.traitlets import ( Dict, List, Unicode, Integer, CaselessStrEnum, CBool, Any ) from IPython.zmq.ipkernel import ( flags as ipkernel_flags, aliases as ipkernel_aliases, IPKernelApp ) from IPython.zmq.session import Session, default_secure from IPython.zmq.zmqshell import ZMQInteractiveShell #----------------------------------------------------------------------------- # Network Constants #----------------------------------------------------------------------------- from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS #----------------------------------------------------------------------------- # Globals #----------------------------------------------------------------------------- _examples = """ ipython qtconsole # start the qtconsole ipython qtconsole --pylab=inline # start with pylab in inline plotting mode """ #----------------------------------------------------------------------------- # Aliases and Flags #----------------------------------------------------------------------------- flags = dict(ipkernel_flags) qt_flags = { 'existing' : ({'IPythonQtConsoleApp' : {'existing' : 'kernel*.json'}}, "Connect to an existing kernel. If no argument specified, guess most recent"), 'pure' : ({'IPythonQtConsoleApp' : {'pure' : True}}, "Use a pure Python kernel instead of an IPython kernel."), 'plain' : ({'ConsoleWidget' : {'kind' : 'plain'}}, "Disable rich text support."), } qt_flags.update(boolean_flag( 'gui-completion', 'ConsoleWidget.gui_completion', "use a GUI widget for tab completion", "use plaintext output for completion" )) qt_flags.update(boolean_flag( 'confirm-exit', 'IPythonQtConsoleApp.confirm_exit', """Set to display confirmation dialog on exit. You can always use 'exit' or 'quit', to force a direct exit without any confirmation. """, """Don't prompt the user when exiting. This will terminate the kernel if it is owned by the frontend, and leave it alive if it is external. """ )) flags.update(qt_flags) aliases = dict(ipkernel_aliases) qt_aliases = dict( hb = 'IPythonQtConsoleApp.hb_port', shell = 'IPythonQtConsoleApp.shell_port', iopub = 'IPythonQtConsoleApp.iopub_port', stdin = 'IPythonQtConsoleApp.stdin_port', ip = 'IPythonQtConsoleApp.ip', existing = 'IPythonQtConsoleApp.existing', f = 'IPythonQtConsoleApp.connection_file', style = 'IPythonWidget.syntax_style', stylesheet = 'IPythonQtConsoleApp.stylesheet', colors = 'ZMQInteractiveShell.colors', editor = 'IPythonWidget.editor', paging = 'ConsoleWidget.paging', ssh = 'IPythonQtConsoleApp.sshserver', ) aliases.update(qt_aliases) #----------------------------------------------------------------------------- # Classes #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # IPythonQtConsole #----------------------------------------------------------------------------- class IPythonQtConsoleApp(BaseIPythonApplication): name = 'ipython-qtconsole' default_config_file_name='ipython_config.py' description = """ The IPython QtConsole. This launches a Console-style application using Qt. It is not a full console, in that launched terminal subprocesses will not be able to accept input. The QtConsole supports various extra features beyond the Terminal IPython shell, such as inline plotting with matplotlib, via: ipython qtconsole --pylab=inline as well as saving your session as HTML, and printing the output. """ examples = _examples classes = [IPKernelApp, IPythonWidget, ZMQInteractiveShell, ProfileDir, Session] flags = Dict(flags) aliases = Dict(aliases) kernel_argv = List(Unicode) # create requested profiles by default, if they don't exist: auto_create = CBool(True) # connection info: ip = Unicode(LOCALHOST, config=True, help="""Set the kernel\'s IP address [default localhost]. If the IP address is something other than localhost, then Consoles on other machines will be able to connect to the Kernel, so be careful!""" ) sshserver = Unicode('', config=True, help="""The SSH server to use to connect to the kernel.""") sshkey = Unicode('', config=True, help="""Path to the ssh key to use for logging in to the ssh server.""") hb_port = Integer(0, config=True, help="set the heartbeat port [default: random]") shell_port = Integer(0, config=True, help="set the shell (XREP) port [default: random]") iopub_port = Integer(0, config=True, help="set the iopub (PUB) port [default: random]") stdin_port = Integer(0, config=True, help="set the stdin (XREQ) port [default: random]") connection_file = Unicode('', config=True, help="""JSON file in which to store connection info [default: kernel-.json] This file will contain the IP, ports, and authentication key needed to connect clients to this kernel. By default, this file will be created in the security-dir of the current profile, but can be specified by absolute path. """) def _connection_file_default(self): return 'kernel-%i.json' % os.getpid() existing = Unicode('', config=True, help="""Connect to an already running kernel""") stylesheet = Unicode('', config=True, help="path to a custom CSS stylesheet") pure = CBool(False, config=True, help="Use a pure Python kernel instead of an IPython kernel.") plain = CBool(False, config=True, help="Use a plaintext widget instead of rich text (plain can't print/save).") def _pure_changed(self, name, old, new): kind = 'plain' if self.plain else 'rich' self.config.ConsoleWidget.kind = kind if self.pure: self.widget_factory = FrontendWidget elif self.plain: self.widget_factory = IPythonWidget else: self.widget_factory = RichIPythonWidget _plain_changed = _pure_changed confirm_exit = CBool(True, config=True, help=""" Set to display confirmation dialog on exit. You can always use 'exit' or 'quit', to force a direct exit without any confirmation.""", ) # the factory for creating a widget widget_factory = Any(RichIPythonWidget) def parse_command_line(self, argv=None): super(IPythonQtConsoleApp, self).parse_command_line(argv) if argv is None: argv = sys.argv[1:] self.kernel_argv = list(argv) # copy # kernel should inherit default config file from frontend self.kernel_argv.append("--KernelApp.parent_appname='%s'"%self.name) # Scrub frontend-specific flags swallow_next = False was_flag = False # copy again, in case some aliases have the same name as a flag # argv = list(self.kernel_argv) for a in argv: if swallow_next: swallow_next = False # last arg was an alias, remove the next one # *unless* the last alias has a no-arg flag version, in which # case, don't swallow the next arg if it's also a flag: if not (was_flag and a.startswith('-')): self.kernel_argv.remove(a) continue if a.startswith('-'): split = a.lstrip('-').split('=') alias = split[0] if alias in qt_aliases: self.kernel_argv.remove(a) if len(split) == 1: # alias passed with arg via space swallow_next = True # could have been a flag that matches an alias, e.g. `existing` # in which case, we might not swallow the next arg was_flag = alias in qt_flags elif alias in qt_flags: # strip flag, but don't swallow next, as flags don't take args self.kernel_argv.remove(a) def init_connection_file(self): """find the connection file, and load the info if found. The current working directory and the current profile's security directory will be searched for the file if it is not given by absolute path. When attempting to connect to an existing kernel and the `--existing` argument does not match an existing file, it will be interpreted as a fileglob, and the matching file in the current profile's security dir with the latest access time will be used. """ if self.existing: try: cf = find_connection_file(self.existing) except Exception: self.log.critical("Could not find existing kernel connection file %s", self.existing) self.exit(1) self.log.info("Connecting to existing kernel: %s" % cf) self.connection_file = cf # should load_connection_file only be used for existing? # as it is now, this allows reusing ports if an existing # file is requested try: self.load_connection_file() except Exception: self.log.error("Failed to load connection file: %r", self.connection_file, exc_info=True) self.exit(1) def load_connection_file(self): """load ip/port/hmac config from JSON connection file""" # this is identical to KernelApp.load_connection_file # perhaps it can be centralized somewhere? try: fname = filefind(self.connection_file, ['.', self.profile_dir.security_dir]) except IOError: self.log.debug("Connection File not found: %s", self.connection_file) return self.log.debug(u"Loading connection file %s", fname) with open(fname) as f: s = f.read() cfg = json.loads(s) if self.ip == LOCALHOST and 'ip' in cfg: # not overridden by config or cl_args self.ip = cfg['ip'] for channel in ('hb', 'shell', 'iopub', 'stdin'): name = channel + '_port' if getattr(self, name) == 0 and name in cfg: # not overridden by config or cl_args setattr(self, name, cfg[name]) if 'key' in cfg: self.config.Session.key = str_to_bytes(cfg['key']) def init_ssh(self): """set up ssh tunnels, if needed.""" if not self.sshserver and not self.sshkey: return if self.sshkey and not self.sshserver: # specifying just the key implies that we are connecting directly self.sshserver = self.ip self.ip = LOCALHOST # build connection dict for tunnels: info = dict(ip=self.ip, shell_port=self.shell_port, iopub_port=self.iopub_port, stdin_port=self.stdin_port, hb_port=self.hb_port ) self.log.info("Forwarding connections to %s via %s"%(self.ip, self.sshserver)) # tunnels return a new set of ports, which will be on localhost: self.ip = LOCALHOST try: newports = tunnel_to_kernel(info, self.sshserver, self.sshkey) except: # even catch KeyboardInterrupt self.log.error("Could not setup tunnels", exc_info=True) self.exit(1) self.shell_port, self.iopub_port, self.stdin_port, self.hb_port = newports cf = self.connection_file base,ext = os.path.splitext(cf) base = os.path.basename(base) self.connection_file = os.path.basename(base)+'-ssh'+ext self.log.critical("To connect another client via this tunnel, use:") self.log.critical("--existing %s" % self.connection_file) def _new_connection_file(self): return os.path.join(self.profile_dir.security_dir, 'kernel-%s.json' % uuid.uuid4()) def init_kernel_manager(self): # Don't let Qt or ZMQ swallow KeyboardInterupts. signal.signal(signal.SIGINT, signal.SIG_DFL) sec = self.profile_dir.security_dir try: cf = filefind(self.connection_file, ['.', sec]) except IOError: # file might not exist if self.connection_file == os.path.basename(self.connection_file): # just shortname, put it in security dir cf = os.path.join(sec, self.connection_file) else: cf = self.connection_file # Create a KernelManager and start a kernel. self.kernel_manager = QtKernelManager( ip=self.ip, shell_port=self.shell_port, iopub_port=self.iopub_port, stdin_port=self.stdin_port, hb_port=self.hb_port, connection_file=cf, config=self.config, ) # start the kernel if not self.existing: kwargs = dict(ipython=not self.pure) kwargs['extra_arguments'] = self.kernel_argv self.kernel_manager.start_kernel(**kwargs) elif self.sshserver: # ssh, write new connection file self.kernel_manager.write_connection_file() self.kernel_manager.start_channels() def new_frontend_master(self): """ Create and return new frontend attached to new kernel, launched on localhost. """ ip = self.ip if self.ip in LOCAL_IPS else LOCALHOST kernel_manager = QtKernelManager( ip=ip, connection_file=self._new_connection_file(), config=self.config, ) # start the kernel kwargs = dict(ipython=not self.pure) kwargs['extra_arguments'] = self.kernel_argv kernel_manager.start_kernel(**kwargs) kernel_manager.start_channels() widget = self.widget_factory(config=self.config, local_kernel=True) widget.kernel_manager = kernel_manager widget._existing = False widget._may_close = True widget._confirm_exit = self.confirm_exit return widget def new_frontend_slave(self, current_widget): """Create and return a new frontend attached to an existing kernel. Parameters ---------- current_widget : IPythonWidget The IPythonWidget whose kernel this frontend is to share """ kernel_manager = QtKernelManager( connection_file=current_widget.kernel_manager.connection_file, config = self.config, ) kernel_manager.load_connection_file() kernel_manager.start_channels() widget = self.widget_factory(config=self.config, local_kernel=False) widget._existing = True widget._may_close = False widget._confirm_exit = False widget.kernel_manager = kernel_manager return widget def init_qt_elements(self): # Create the widget. self.app = QtGui.QApplication([]) base_path = os.path.abspath(os.path.dirname(__file__)) icon_path = os.path.join(base_path, 'resources', 'icon', 'IPythonConsole.svg') self.app.icon = QtGui.QIcon(icon_path) QtGui.QApplication.setWindowIcon(self.app.icon) local_kernel = (not self.existing) or self.ip in LOCAL_IPS self.widget = self.widget_factory(config=self.config, local_kernel=local_kernel) self.widget._existing = self.existing self.widget._may_close = not self.existing self.widget._confirm_exit = self.confirm_exit self.widget.kernel_manager = self.kernel_manager self.window = MainWindow(self.app, confirm_exit=self.confirm_exit, new_frontend_factory=self.new_frontend_master, slave_frontend_factory=self.new_frontend_slave, ) self.window.log = self.log self.window.add_tab_with_frontend(self.widget) self.window.init_menu_bar() # we need to populate the 'Magic Menu' once the kernel has answer at least once self.kernel_manager.shell_channel.first_reply.connect(self.window.pop.trigger) self.window.setWindowTitle('Python' if self.pure else 'IPython') def init_colors(self): """Configure the coloring of the widget""" # Note: This will be dramatically simplified when colors # are removed from the backend. if self.pure: # only IPythonWidget supports styling return # parse the colors arg down to current known labels try: colors = self.config.ZMQInteractiveShell.colors except AttributeError: colors = None try: style = self.config.IPythonWidget.syntax_style except AttributeError: style = None # find the value for colors: if colors: colors=colors.lower() if colors in ('lightbg', 'light'): colors='lightbg' elif colors in ('dark', 'linux'): colors='linux' else: colors='nocolor' elif style: if style=='bw': colors='nocolor' elif styles.dark_style(style): colors='linux' else: colors='lightbg' else: colors=None # Configure the style. widget = self.widget if style: widget.style_sheet = styles.sheet_from_template(style, colors) widget.syntax_style = style widget._syntax_style_changed() widget._style_sheet_changed() elif colors: # use a default style widget.set_default_style(colors=colors) else: # this is redundant for now, but allows the widget's # defaults to change widget.set_default_style() if self.stylesheet: # we got an expicit stylesheet if os.path.isfile(self.stylesheet): with open(self.stylesheet) as f: sheet = f.read() widget.style_sheet = sheet widget._style_sheet_changed() else: raise IOError("Stylesheet %r not found."%self.stylesheet) @catch_config_error def initialize(self, argv=None): super(IPythonQtConsoleApp, self).initialize(argv) self.init_connection_file() default_secure(self.config) self.init_ssh() self.init_kernel_manager() self.init_qt_elements() self.init_colors() def start(self): # draw the window self.window.show() # Start the application main loop. self.app.exec_() #----------------------------------------------------------------------------- # Main entry point #----------------------------------------------------------------------------- def main(): app = IPythonQtConsoleApp() app.initialize() app.start() if __name__ == '__main__': main()