# coding: utf-8 """A tornado based IPython notebook server. Authors: * Brian Granger """ #----------------------------------------------------------------------------- # Copyright (C) 2008-2011 The IPython Development Team # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- # stdlib import errno import logging import os import re import select import signal import socket import sys import threading import time import webbrowser # Third party import zmq # Install the pyzmq ioloop. This has to be done before anything else from # tornado is imported. from zmq.eventloop import ioloop # FIXME: ioloop.install is new in pyzmq-2.1.7, so remove this conditional # when pyzmq dependency is updated beyond that. if hasattr(ioloop, 'install'): ioloop.install() else: import tornado.ioloop tornado.ioloop.IOLoop = ioloop.IOLoop from tornado import httpserver from tornado import web # Our own libraries from .kernelmanager import MappingKernelManager from .handlers import (LoginHandler, LogoutHandler, ProjectDashboardHandler, NewHandler, NamedNotebookHandler, MainKernelHandler, KernelHandler, KernelActionHandler, IOPubHandler, ShellHandler, NotebookRootHandler, NotebookHandler, NotebookCopyHandler, RSTHandler, AuthenticatedFileHandler, PrintNotebookHandler, MainClusterHandler, ClusterProfileHandler, ClusterActionHandler ) from .notebookmanager import NotebookManager from .clustermanager import ClusterManager from IPython.config.application import catch_config_error, boolean_flag from IPython.core.application import BaseIPythonApplication from IPython.core.profiledir import ProfileDir from IPython.lib.kernel import swallow_argv from IPython.zmq.session import Session, default_secure from IPython.zmq.zmqshell import ZMQInteractiveShell from IPython.zmq.ipkernel import ( flags as ipkernel_flags, aliases as ipkernel_aliases, IPKernelApp ) from IPython.utils.traitlets import Dict, Unicode, Integer, List, Enum, Bool from IPython.utils import py3compat #----------------------------------------------------------------------------- # Module globals #----------------------------------------------------------------------------- _kernel_id_regex = r"(?P\w+-\w+-\w+-\w+-\w+)" _kernel_action_regex = r"(?Prestart|interrupt)" _notebook_id_regex = r"(?P\w+-\w+-\w+-\w+-\w+)" _profile_regex = r"(?P[a-zA-Z0-9]+)" _cluster_action_regex = r"(?Pstart|stop)" LOCALHOST = '127.0.0.1' _examples = """ ipython notebook # start the notebook ipython notebook --profile=sympy # use the sympy profile ipython notebook --pylab=inline # pylab in inline plotting mode ipython notebook --certfile=mycert.pem # use SSL/TLS certificate ipython notebook --port=5555 --ip=* # Listen on port 5555, all interfaces """ #----------------------------------------------------------------------------- # Helper functions #----------------------------------------------------------------------------- def url_path_join(a,b): if a.endswith('/') and b.startswith('/'): return a[:-1]+b else: return a+b #----------------------------------------------------------------------------- # The Tornado web application #----------------------------------------------------------------------------- class NotebookWebApplication(web.Application): def __init__(self, ipython_app, kernel_manager, notebook_manager, cluster_manager, log, base_project_url, settings_overrides): handlers = [ (r"/", ProjectDashboardHandler), (r"/login", LoginHandler), (r"/logout", LogoutHandler), (r"/new", NewHandler), (r"/%s" % _notebook_id_regex, NamedNotebookHandler), (r"/%s/copy" % _notebook_id_regex, NotebookCopyHandler), (r"/%s/print" % _notebook_id_regex, PrintNotebookHandler), (r"/kernels", MainKernelHandler), (r"/kernels/%s" % _kernel_id_regex, KernelHandler), (r"/kernels/%s/%s" % (_kernel_id_regex, _kernel_action_regex), KernelActionHandler), (r"/kernels/%s/iopub" % _kernel_id_regex, IOPubHandler), (r"/kernels/%s/shell" % _kernel_id_regex, ShellHandler), (r"/notebooks", NotebookRootHandler), (r"/notebooks/%s" % _notebook_id_regex, NotebookHandler), (r"/rstservice/render", RSTHandler), (r"/files/(.*)", AuthenticatedFileHandler, {'path' : notebook_manager.notebook_dir}), (r"/clusters", MainClusterHandler), (r"/clusters/%s/%s" % (_profile_regex, _cluster_action_regex), ClusterActionHandler), (r"/clusters/%s" % _profile_regex, ClusterProfileHandler), ] settings = dict( template_path=os.path.join(os.path.dirname(__file__), "templates"), static_path=os.path.join(os.path.dirname(__file__), "static"), cookie_secret=os.urandom(1024), login_url="/login", ) # allow custom overrides for the tornado web app. settings.update(settings_overrides) # Python < 2.6.5 doesn't accept unicode keys in f(**kwargs), and # base_project_url will always be unicode, which will in turn # make the patterns unicode, and ultimately result in unicode # keys in kwargs to handler._execute(**kwargs) in tornado. # This enforces that base_project_url be ascii in that situation. # # Note that the URLs these patterns check against are escaped, # and thus guaranteed to be ASCII: 'héllo' is really 'h%C3%A9llo'. base_project_url = py3compat.unicode_to_str(base_project_url, 'ascii') # prepend base_project_url onto the patterns that we match new_handlers = [] for handler in handlers: pattern = url_path_join(base_project_url, handler[0]) new_handler = tuple([pattern]+list(handler[1:])) new_handlers.append( new_handler ) super(NotebookWebApplication, self).__init__(new_handlers, **settings) self.kernel_manager = kernel_manager self.notebook_manager = notebook_manager self.cluster_manager = cluster_manager self.ipython_app = ipython_app self.read_only = self.ipython_app.read_only self.log = log #----------------------------------------------------------------------------- # Aliases and Flags #----------------------------------------------------------------------------- flags = dict(ipkernel_flags) flags['no-browser']=( {'NotebookApp' : {'open_browser' : False}}, "Don't open the notebook in a browser after startup." ) flags['no-mathjax']=( {'NotebookApp' : {'enable_mathjax' : False}}, """Disable MathJax MathJax is the javascript library IPython uses to render math/LaTeX. It is very large, so you may want to disable it if you have a slow internet connection, or for offline use of the notebook. When disabled, equations etc. will appear as their untransformed TeX source. """ ) flags['read-only'] = ( {'NotebookApp' : {'read_only' : True}}, """Allow read-only access to notebooks. When using a password to protect the notebook server, this flag allows unauthenticated clients to view the notebook list, and individual notebooks, but not edit them, start kernels, or run code. If no password is set, the server will be entirely read-only. """ ) # Add notebook manager flags flags.update(boolean_flag('script', 'NotebookManager.save_script', 'Auto-save a .py script everytime the .ipynb notebook is saved', 'Do not auto-save .py scripts for every notebook')) # the flags that are specific to the frontend # these must be scrubbed before being passed to the kernel, # or it will raise an error on unrecognized flags notebook_flags = ['no-browser', 'no-mathjax', 'read-only', 'script', 'no-script'] aliases = dict(ipkernel_aliases) aliases.update({ 'ip': 'NotebookApp.ip', 'port': 'NotebookApp.port', 'keyfile': 'NotebookApp.keyfile', 'certfile': 'NotebookApp.certfile', 'notebook-dir': 'NotebookManager.notebook_dir', 'browser': 'NotebookApp.browser', }) # remove ipkernel flags that are singletons, and don't make sense in # multi-kernel evironment: aliases.pop('f', None) notebook_aliases = [u'port', u'ip', u'keyfile', u'certfile', u'notebook-dir'] #----------------------------------------------------------------------------- # NotebookApp #----------------------------------------------------------------------------- class NotebookApp(BaseIPythonApplication): name = 'ipython-notebook' default_config_file_name='ipython_notebook_config.py' description = """ The IPython HTML Notebook. This launches a Tornado based HTML Notebook Server that serves up an HTML5/Javascript Notebook client. """ examples = _examples classes = [IPKernelApp, ZMQInteractiveShell, ProfileDir, Session, MappingKernelManager, NotebookManager] flags = Dict(flags) aliases = Dict(aliases) kernel_argv = List(Unicode) log_level = Enum((0,10,20,30,40,50,'DEBUG','INFO','WARN','ERROR','CRITICAL'), default_value=logging.INFO, config=True, help="Set the log level by value or name.") # create requested profiles by default, if they don't exist: auto_create = Bool(True) # Network related information. ip = Unicode(LOCALHOST, config=True, help="The IP address the notebook server will listen on." ) def _ip_changed(self, name, old, new): if new == u'*': self.ip = u'' port = Integer(8888, config=True, help="The port the notebook server will listen on." ) certfile = Unicode(u'', config=True, help="""The full path to an SSL/TLS certificate file.""" ) keyfile = Unicode(u'', config=True, help="""The full path to a private key file for usage with SSL/TLS.""" ) password = Unicode(u'', config=True, help="""Hashed password to use for web authentication. To generate, type in a python/IPython shell: from IPython.lib import passwd; passwd() The string should be of the form type:salt:hashed-password. """ ) open_browser = Bool(True, config=True, help="""Whether to open in a browser after starting. The specific browser used is platform dependent and determined by the python standard library `webbrowser` module, unless it is overridden using the --browser (NotebookApp.browser) configuration option. """) browser = Unicode(u'', config=True, help="""Specify what command to use to invoke a web browser when opening the notebook. If not specified, the default browser will be determined by the `webbrowser` standard library module, which allows setting of the BROWSER environment variable to override it. """) read_only = Bool(False, config=True, help="Whether to prevent editing/execution of notebooks." ) webapp_settings = Dict(config=True, help="Supply overrides for the tornado.web.Application that the " "IPython notebook uses.") enable_mathjax = Bool(True, config=True, help="""Whether to enable MathJax for typesetting math/TeX MathJax is the javascript library IPython uses to render math/LaTeX. It is very large, so you may want to disable it if you have a slow internet connection, or for offline use of the notebook. When disabled, equations etc. will appear as their untransformed TeX source. """ ) def _enable_mathjax_changed(self, name, old, new): """set mathjax url to empty if mathjax is disabled""" if not new: self.mathjax_url = u'' base_project_url = Unicode('/', config=True, help='''The base URL for the notebook server''') base_kernel_url = Unicode('/', config=True, help='''The base URL for the kernel server''') websocket_host = Unicode("", config=True, help="""The hostname for the websocket server.""" ) mathjax_url = Unicode("", config=True, help="""The url for MathJax.js.""" ) def _mathjax_url_default(self): if not self.enable_mathjax: return u'' static_path = self.webapp_settings.get("static_path", os.path.join(os.path.dirname(__file__), "static")) static_url_prefix = self.webapp_settings.get("static_url_prefix", "/static/") if os.path.exists(os.path.join(static_path, 'mathjax', "MathJax.js")): self.log.info("Using local MathJax") return static_url_prefix+u"mathjax/MathJax.js" else: self.log.info("Using MathJax from CDN") hostname = "cdn.mathjax.org" try: # resolve mathjax cdn alias to cloudfront, because Amazon's SSL certificate # only works on *.cloudfront.net true_host, aliases, IPs = socket.gethostbyname_ex(hostname) # I've run this on a few machines, and some put the right answer in true_host, # while others gave it in the aliases list, so we check both. aliases.insert(0, true_host) except Exception: self.log.warn("Couldn't determine MathJax CDN info") else: for alias in aliases: parts = alias.split('.') # want static foo.cloudfront.net, not dynamic foo.lax3.cloudfront.net if len(parts) == 3 and alias.endswith(".cloudfront.net"): hostname = alias break if not hostname.endswith(".cloudfront.net"): self.log.error("Couldn't resolve CloudFront host, required for HTTPS MathJax.") self.log.error("Loading from https://cdn.mathjax.org will probably fail due to invalid certificate.") self.log.error("For unsecured HTTP access to MathJax use config:") self.log.error("NotebookApp.mathjax_url='http://cdn.mathjax.org/mathjax/latest/MathJax.js'") return u"https://%s/mathjax/latest/MathJax.js" % hostname def _mathjax_url_changed(self, name, old, new): if new and not self.enable_mathjax: # enable_mathjax=False overrides mathjax_url self.mathjax_url = u'' else: self.log.info("Using MathJax: %s", new) def parse_command_line(self, argv=None): super(NotebookApp, self).parse_command_line(argv) if argv is None: argv = sys.argv[1:] # Scrub frontend-specific flags self.kernel_argv = swallow_argv(argv, notebook_aliases, notebook_flags) # Kernel should inherit default config file from frontend self.kernel_argv.append("--KernelApp.parent_appname='%s'"%self.name) def init_configurables(self): # force Session default to be secure default_secure(self.config) # Create a KernelManager and start a kernel. self.kernel_manager = MappingKernelManager( config=self.config, log=self.log, kernel_argv=self.kernel_argv, connection_dir = self.profile_dir.security_dir, ) self.notebook_manager = NotebookManager(config=self.config, log=self.log) self.notebook_manager.list_notebooks() self.cluster_manager = ClusterManager(config=self.config, log=self.log) self.cluster_manager.update_profiles() def init_logging(self): super(NotebookApp, self).init_logging() # This prevents double log messages because tornado use a root logger that # self.log is a child of. The logging module dipatches log messages to a log # and all of its ancenstors until propagate is set to False. self.log.propagate = False def init_webapp(self): """initialize tornado webapp and httpserver""" self.web_app = NotebookWebApplication( self, self.kernel_manager, self.notebook_manager, self.cluster_manager, self.log, self.base_project_url, self.webapp_settings ) if self.certfile: ssl_options = dict(certfile=self.certfile) if self.keyfile: ssl_options['keyfile'] = self.keyfile else: ssl_options = None self.web_app.password = self.password self.http_server = httpserver.HTTPServer(self.web_app, ssl_options=ssl_options) if ssl_options is None and not self.ip and not (self.read_only and not self.password): self.log.critical('WARNING: the notebook server is listening on all IP addresses ' 'but not using any encryption or authentication. This is highly ' 'insecure and not recommended.') # Try random ports centered around the default. from random import randint n = 50 # Max number of attempts, keep reasonably large. for port in range(self.port, self.port+5) + [self.port + randint(-2*n, 2*n) for i in range(n-5)]: try: self.http_server.listen(port, self.ip) except socket.error, e: if e.errno != errno.EADDRINUSE: raise self.log.info('The port %i is already in use, trying another random port.' % port) else: self.port = port break def init_signal(self): # FIXME: remove this check when pyzmq dependency is >= 2.1.11 # safely extract zmq version info: try: zmq_v = zmq.pyzmq_version_info() except AttributeError: zmq_v = [ int(n) for n in re.findall(r'\d+', zmq.__version__) ] if 'dev' in zmq.__version__: zmq_v.append(999) zmq_v = tuple(zmq_v) if zmq_v >= (2,1,9): # This won't work with 2.1.7 and # 2.1.9-10 will log ugly 'Interrupted system call' messages, # but it will work signal.signal(signal.SIGINT, self._handle_sigint) signal.signal(signal.SIGTERM, self._signal_stop) def _handle_sigint(self, sig, frame): """SIGINT handler spawns confirmation dialog""" # register more forceful signal handler for ^C^C case signal.signal(signal.SIGINT, self._signal_stop) # request confirmation dialog in bg thread, to avoid # blocking the App thread = threading.Thread(target=self._confirm_exit) thread.daemon = True thread.start() def _restore_sigint_handler(self): """callback for restoring original SIGINT handler""" signal.signal(signal.SIGINT, self._handle_sigint) def _confirm_exit(self): """confirm shutdown on ^C A second ^C, or answering 'y' within 5s will cause shutdown, otherwise original SIGINT handler will be restored. """ # FIXME: remove this delay when pyzmq dependency is >= 2.1.11 time.sleep(0.1) sys.stdout.write("Shutdown Notebook Server (y/[n])? ") sys.stdout.flush() r,w,x = select.select([sys.stdin], [], [], 5) if r: line = sys.stdin.readline() if line.lower().startswith('y'): self.log.critical("Shutdown confirmed") ioloop.IOLoop.instance().stop() return else: print "No answer for 5s:", print "resuming operation..." # no answer, or answer is no: # set it back to original SIGINT handler # use IOLoop.add_callback because signal.signal must be called # from main thread ioloop.IOLoop.instance().add_callback(self._restore_sigint_handler) def _signal_stop(self, sig, frame): self.log.critical("received signal %s, stopping", sig) ioloop.IOLoop.instance().stop() @catch_config_error def initialize(self, argv=None): super(NotebookApp, self).initialize(argv) self.init_configurables() self.init_webapp() self.init_signal() def cleanup_kernels(self): """shutdown all kernels The kernels will shutdown themselves when this process no longer exists, but explicit shutdown allows the KernelManagers to cleanup the connection files. """ self.log.info('Shutting down kernels') km = self.kernel_manager # copy list, since kill_kernel deletes keys for kid in list(km.kernel_ids): km.kill_kernel(kid) def start(self): ip = self.ip if self.ip else '[all ip addresses on your system]' proto = 'https' if self.certfile else 'http' info = self.log.info info("The IPython Notebook is running at: %s://%s:%i%s" % (proto, ip, self.port,self.base_project_url) ) info("Use Control-C to stop this server and shut down all kernels.") if self.open_browser: ip = self.ip or '127.0.0.1' if self.browser: browser = webbrowser.get(self.browser) else: browser = webbrowser.get() b = lambda : browser.open("%s://%s:%i%s" % (proto, ip, self.port, self.base_project_url), new=2) threading.Thread(target=b).start() try: ioloop.IOLoop.instance().start() except KeyboardInterrupt: info("Interrupted...") finally: self.cleanup_kernels() #----------------------------------------------------------------------------- # Main entry point #----------------------------------------------------------------------------- def launch_new_instance(): app = NotebookApp.instance() app.initialize() app.start()