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"""Tornado handlers for the notebook.
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Authors:
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* Brian Granger
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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 logging
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import Cookie
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import time
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import uuid
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from tornado import web
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from tornado import websocket
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from zmq.eventloop import ioloop
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from zmq.utils import jsonapi
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from IPython.external.decorator import decorator
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from IPython.zmq.session import Session
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from IPython.lib.security import passwd_check
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try:
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from docutils.core import publish_string
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except ImportError:
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publish_string = None
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#-----------------------------------------------------------------------------
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# Monkeypatch for Tornado <= 2.1.1 - Remove when no longer necessary!
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#-----------------------------------------------------------------------------
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# Google Chrome, as of release 16, changed its websocket protocol number. The
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# parts tornado cares about haven't really changed, so it's OK to continue
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# accepting Chrome connections, but as of Tornado 2.1.1 (the currently released
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# version as of Oct 30/2011) the version check fails, see the issue report:
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# https://github.com/facebook/tornado/issues/385
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# This issue has been fixed in Tornado post 2.1.1:
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# https://github.com/facebook/tornado/commit/84d7b458f956727c3b0d6710
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# Here we manually apply the same patch as above so that users of IPython can
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# continue to work with an officially released Tornado. We make the
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# monkeypatch version check as narrow as possible to limit its effects; once
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# Tornado 2.1.1 is no longer found in the wild we'll delete this code.
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import tornado
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if tornado.version_info <= (2,1,1):
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def _execute(self, transforms, *args, **kwargs):
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from tornado.websocket import WebSocketProtocol8, WebSocketProtocol76
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self.open_args = args
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self.open_kwargs = kwargs
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# The difference between version 8 and 13 is that in 8 the
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# client sends a "Sec-Websocket-Origin" header and in 13 it's
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# simply "Origin".
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if self.request.headers.get("Sec-WebSocket-Version") in ("7", "8", "13"):
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self.ws_connection = WebSocketProtocol8(self)
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self.ws_connection.accept_connection()
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elif self.request.headers.get("Sec-WebSocket-Version"):
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self.stream.write(tornado.escape.utf8(
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"HTTP/1.1 426 Upgrade Required\r\n"
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"Sec-WebSocket-Version: 8\r\n\r\n"))
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self.stream.close()
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else:
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self.ws_connection = WebSocketProtocol76(self)
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self.ws_connection.accept_connection()
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websocket.WebSocketHandler._execute = _execute
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del _execute
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#-----------------------------------------------------------------------------
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# Decorator for disabling read-only handlers
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#-----------------------------------------------------------------------------
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@decorator
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def not_if_readonly(f, self, *args, **kwargs):
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if self.application.read_only:
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raise web.HTTPError(403, "Notebook server is read-only")
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else:
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return f(self, *args, **kwargs)
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@decorator
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def authenticate_unless_readonly(f, self, *args, **kwargs):
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"""authenticate this page *unless* readonly view is active.
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In read-only mode, the notebook list and print view should
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be accessible without authentication.
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"""
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@web.authenticated
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def auth_f(self, *args, **kwargs):
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return f(self, *args, **kwargs)
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if self.application.read_only:
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return f(self, *args, **kwargs)
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else:
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return auth_f(self, *args, **kwargs)
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#-----------------------------------------------------------------------------
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# Top-level handlers
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#-----------------------------------------------------------------------------
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class RequestHandler(web.RequestHandler):
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"""RequestHandler with default variable setting."""
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def render(*args, **kwargs):
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kwargs.setdefault('message', '')
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return web.RequestHandler.render(*args, **kwargs)
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class AuthenticatedHandler(RequestHandler):
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"""A RequestHandler with an authenticated user."""
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def get_current_user(self):
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user_id = self.get_secure_cookie("username")
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# For now the user_id should not return empty, but it could eventually
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if user_id == '':
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user_id = 'anonymous'
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if user_id is None:
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# prevent extra Invalid cookie sig warnings:
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self.clear_cookie('username')
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if not self.application.password and not self.application.read_only:
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user_id = 'anonymous'
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return user_id
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@property
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def logged_in(self):
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"""Is a user currently logged in?
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"""
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user = self.get_current_user()
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return (user and not user == 'anonymous')
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@property
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def login_available(self):
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"""May a user proceed to log in?
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This returns True if login capability is available, irrespective of
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whether the user is already logged in or not.
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"""
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return bool(self.application.password)
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@property
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def read_only(self):
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"""Is the notebook read-only?
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"""
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return self.application.read_only
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@property
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def ws_url(self):
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"""websocket url matching the current request
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turns http[s]://host[:port] into
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ws[s]://host[:port]
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"""
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proto = self.request.protocol.replace('http', 'ws')
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return "%s://%s" % (proto, self.request.host)
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class AuthenticatedFileHandler(AuthenticatedHandler, web.StaticFileHandler):
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"""static files should only be accessible when logged in"""
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@authenticate_unless_readonly
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def get(self, path):
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return web.StaticFileHandler.get(self, path)
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class ProjectDashboardHandler(AuthenticatedHandler):
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@authenticate_unless_readonly
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def get(self):
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nbm = self.application.notebook_manager
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project = nbm.notebook_dir
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self.render(
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'projectdashboard.html', project=project,
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base_project_url=u'/', base_kernel_url=u'/',
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read_only=self.read_only,
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logged_in=self.logged_in,
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login_available=self.login_available
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)
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class LoginHandler(AuthenticatedHandler):
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def _render(self, message=None):
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self.render('login.html',
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next=self.get_argument('next', default='/'),
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read_only=self.read_only,
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logged_in=self.logged_in,
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login_available=self.login_available,
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message=message
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)
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def get(self):
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if self.current_user:
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self.redirect(self.get_argument('next', default='/'))
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else:
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self._render()
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def post(self):
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pwd = self.get_argument('password', default=u'')
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if self.application.password:
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if passwd_check(self.application.password, pwd):
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self.set_secure_cookie('username', str(uuid.uuid4()))
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else:
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self._render(message={'error': 'Invalid password'})
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return
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self.redirect(self.get_argument('next', default='/'))
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class LogoutHandler(AuthenticatedHandler):
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def get(self):
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self.clear_cookie('username')
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if self.login_available:
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message = {'info': 'Successfully logged out.'}
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else:
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message = {'warning': 'Cannot log out. Notebook authentication '
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'is disabled.'}
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self.render('logout.html',
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read_only=self.read_only,
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logged_in=self.logged_in,
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login_available=self.login_available,
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message=message)
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class NewHandler(AuthenticatedHandler):
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@web.authenticated
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def get(self):
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nbm = self.application.notebook_manager
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project = nbm.notebook_dir
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notebook_id = nbm.new_notebook()
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self.render(
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'notebook.html', project=project,
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notebook_id=notebook_id,
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base_project_url=u'/', base_kernel_url=u'/',
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kill_kernel=False,
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read_only=False,
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logged_in=self.logged_in,
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login_available=self.login_available,
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mathjax_url=self.application.ipython_app.mathjax_url,
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)
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class NamedNotebookHandler(AuthenticatedHandler):
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@authenticate_unless_readonly
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def get(self, notebook_id):
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nbm = self.application.notebook_manager
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project = nbm.notebook_dir
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if not nbm.notebook_exists(notebook_id):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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self.render(
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'notebook.html', project=project,
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notebook_id=notebook_id,
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base_project_url=u'/', base_kernel_url=u'/',
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kill_kernel=False,
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read_only=self.read_only,
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logged_in=self.logged_in,
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login_available=self.login_available,
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mathjax_url=self.application.ipython_app.mathjax_url,
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)
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class PrintNotebookHandler(AuthenticatedHandler):
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@authenticate_unless_readonly
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def get(self, notebook_id):
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nbm = self.application.notebook_manager
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project = nbm.notebook_dir
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if not nbm.notebook_exists(notebook_id):
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raise web.HTTPError(404, u'Notebook does not exist: %s' % notebook_id)
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self.render(
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'printnotebook.html', project=project,
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notebook_id=notebook_id,
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base_project_url=u'/', base_kernel_url=u'/',
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kill_kernel=False,
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read_only=self.read_only,
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logged_in=self.logged_in,
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login_available=self.login_available,
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mathjax_url=self.application.ipython_app.mathjax_url,
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)
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#-----------------------------------------------------------------------------
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# Kernel handlers
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#-----------------------------------------------------------------------------
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class MainKernelHandler(AuthenticatedHandler):
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@web.authenticated
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def get(self):
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km = self.application.kernel_manager
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self.finish(jsonapi.dumps(km.kernel_ids))
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@web.authenticated
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def post(self):
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km = self.application.kernel_manager
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notebook_id = self.get_argument('notebook', default=None)
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kernel_id = km.start_kernel(notebook_id)
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data = {'ws_url':self.ws_url,'kernel_id':kernel_id}
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self.set_header('Location', '/'+kernel_id)
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self.finish(jsonapi.dumps(data))
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class KernelHandler(AuthenticatedHandler):
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SUPPORTED_METHODS = ('DELETE')
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@web.authenticated
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def delete(self, kernel_id):
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km = self.application.kernel_manager
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km.kill_kernel(kernel_id)
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self.set_status(204)
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self.finish()
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class KernelActionHandler(AuthenticatedHandler):
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@web.authenticated
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def post(self, kernel_id, action):
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km = self.application.kernel_manager
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if action == 'interrupt':
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km.interrupt_kernel(kernel_id)
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self.set_status(204)
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if action == 'restart':
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new_kernel_id = km.restart_kernel(kernel_id)
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data = {'ws_url':self.ws_url,'kernel_id':new_kernel_id}
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self.set_header('Location', '/'+new_kernel_id)
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self.write(jsonapi.dumps(data))
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self.finish()
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class ZMQStreamHandler(websocket.WebSocketHandler):
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|
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def _reserialize_reply(self, msg_list):
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"""Reserialize a reply message using JSON.
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This takes the msg list from the ZMQ socket, unserializes it using
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self.session and then serializes the result using JSON. This method
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should be used by self._on_zmq_reply to build messages that can
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be sent back to the browser.
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"""
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idents, msg_list = self.session.feed_identities(msg_list)
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msg = self.session.unserialize(msg_list)
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try:
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msg['header'].pop('date')
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except KeyError:
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pass
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|
try:
|
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msg['parent_header'].pop('date')
|
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|
except KeyError:
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pass
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|
msg.pop('buffers')
|
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return jsonapi.dumps(msg)
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|
|
|
|
|
def _on_zmq_reply(self, msg_list):
|
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try:
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msg = self._reserialize_reply(msg_list)
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except:
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|
|
self.application.log.critical("Malformed message: %r" % msg_list)
|
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|
else:
|
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self.write_message(msg)
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|
|
|
|
|
|
|
|
class AuthenticatedZMQStreamHandler(ZMQStreamHandler):
|
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|
|
|
|
def open(self, kernel_id):
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|
self.kernel_id = kernel_id.decode('ascii')
|
|
|
try:
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|
|
cfg = self.application.ipython_app.config
|
|
|
except AttributeError:
|
|
|
# protect from the case where this is run from something other than
|
|
|
# the notebook app:
|
|
|
cfg = None
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|
|
self.session = Session(config=cfg)
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|
|
self.save_on_message = self.on_message
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|
self.on_message = self.on_first_message
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|
|
|
|
|
def get_current_user(self):
|
|
|
user_id = self.get_secure_cookie("username")
|
|
|
if user_id == '' or (user_id is None and not self.application.password):
|
|
|
user_id = 'anonymous'
|
|
|
return user_id
|
|
|
|
|
|
def _inject_cookie_message(self, msg):
|
|
|
"""Inject the first message, which is the document cookie,
|
|
|
for authentication."""
|
|
|
if isinstance(msg, unicode):
|
|
|
# Cookie can't constructor doesn't accept unicode strings for some reason
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|
|
msg = msg.encode('utf8', 'replace')
|
|
|
try:
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|
|
self.request._cookies = Cookie.SimpleCookie(msg)
|
|
|
except:
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|
|
logging.warn("couldn't parse cookie string: %s",msg, exc_info=True)
|
|
|
|
|
|
def on_first_message(self, msg):
|
|
|
self._inject_cookie_message(msg)
|
|
|
if self.get_current_user() is None:
|
|
|
logging.warn("Couldn't authenticate WebSocket connection")
|
|
|
raise web.HTTPError(403)
|
|
|
self.on_message = self.save_on_message
|
|
|
|
|
|
|
|
|
class IOPubHandler(AuthenticatedZMQStreamHandler):
|
|
|
|
|
|
def initialize(self, *args, **kwargs):
|
|
|
self._kernel_alive = True
|
|
|
self._beating = False
|
|
|
self.iopub_stream = None
|
|
|
self.hb_stream = None
|
|
|
|
|
|
def on_first_message(self, msg):
|
|
|
try:
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|
super(IOPubHandler, self).on_first_message(msg)
|
|
|
except web.HTTPError:
|
|
|
self.close()
|
|
|
return
|
|
|
km = self.application.kernel_manager
|
|
|
self.time_to_dead = km.time_to_dead
|
|
|
self.first_beat = km.first_beat
|
|
|
kernel_id = self.kernel_id
|
|
|
try:
|
|
|
self.iopub_stream = km.create_iopub_stream(kernel_id)
|
|
|
self.hb_stream = km.create_hb_stream(kernel_id)
|
|
|
except web.HTTPError:
|
|
|
# WebSockets don't response to traditional error codes so we
|
|
|
# close the connection.
|
|
|
if not self.stream.closed():
|
|
|
self.stream.close()
|
|
|
self.close()
|
|
|
else:
|
|
|
self.iopub_stream.on_recv(self._on_zmq_reply)
|
|
|
self.start_hb(self.kernel_died)
|
|
|
|
|
|
def on_message(self, msg):
|
|
|
pass
|
|
|
|
|
|
def on_close(self):
|
|
|
# This method can be called twice, once by self.kernel_died and once
|
|
|
# from the WebSocket close event. If the WebSocket connection is
|
|
|
# closed before the ZMQ streams are setup, they could be None.
|
|
|
self.stop_hb()
|
|
|
if self.iopub_stream is not None and not self.iopub_stream.closed():
|
|
|
self.iopub_stream.on_recv(None)
|
|
|
self.iopub_stream.close()
|
|
|
if self.hb_stream is not None and not self.hb_stream.closed():
|
|
|
self.hb_stream.close()
|
|
|
|
|
|
def start_hb(self, callback):
|
|
|
"""Start the heartbeating and call the callback if the kernel dies."""
|
|
|
if not self._beating:
|
|
|
self._kernel_alive = True
|
|
|
|
|
|
def ping_or_dead():
|
|
|
self.hb_stream.flush()
|
|
|
if self._kernel_alive:
|
|
|
self._kernel_alive = False
|
|
|
self.hb_stream.send(b'ping')
|
|
|
# flush stream to force immediate socket send
|
|
|
self.hb_stream.flush()
|
|
|
else:
|
|
|
try:
|
|
|
callback()
|
|
|
except:
|
|
|
pass
|
|
|
finally:
|
|
|
self.stop_hb()
|
|
|
|
|
|
def beat_received(msg):
|
|
|
self._kernel_alive = True
|
|
|
|
|
|
self.hb_stream.on_recv(beat_received)
|
|
|
loop = ioloop.IOLoop.instance()
|
|
|
self._hb_periodic_callback = ioloop.PeriodicCallback(ping_or_dead, self.time_to_dead*1000, loop)
|
|
|
loop.add_timeout(time.time()+self.first_beat, self._really_start_hb)
|
|
|
self._beating= True
|
|
|
|
|
|
def _really_start_hb(self):
|
|
|
"""callback for delayed heartbeat start
|
|
|
|
|
|
Only start the hb loop if we haven't been closed during the wait.
|
|
|
"""
|
|
|
if self._beating and not self.hb_stream.closed():
|
|
|
self._hb_periodic_callback.start()
|
|
|
|
|
|
def stop_hb(self):
|
|
|
"""Stop the heartbeating and cancel all related callbacks."""
|
|
|
if self._beating:
|
|
|
self._beating = False
|
|
|
self._hb_periodic_callback.stop()
|
|
|
if not self.hb_stream.closed():
|
|
|
self.hb_stream.on_recv(None)
|
|
|
|
|
|
def kernel_died(self):
|
|
|
self.application.kernel_manager.delete_mapping_for_kernel(self.kernel_id)
|
|
|
self.application.log.error("Kernel %s failed to respond to heartbeat", self.kernel_id)
|
|
|
self.write_message(
|
|
|
{'header': {'msg_type': 'status'},
|
|
|
'parent_header': {},
|
|
|
'content': {'execution_state':'dead'}
|
|
|
}
|
|
|
)
|
|
|
self.on_close()
|
|
|
|
|
|
|
|
|
class ShellHandler(AuthenticatedZMQStreamHandler):
|
|
|
|
|
|
def initialize(self, *args, **kwargs):
|
|
|
self.shell_stream = None
|
|
|
|
|
|
def on_first_message(self, msg):
|
|
|
try:
|
|
|
super(ShellHandler, self).on_first_message(msg)
|
|
|
except web.HTTPError:
|
|
|
self.close()
|
|
|
return
|
|
|
km = self.application.kernel_manager
|
|
|
self.max_msg_size = km.max_msg_size
|
|
|
kernel_id = self.kernel_id
|
|
|
try:
|
|
|
self.shell_stream = km.create_shell_stream(kernel_id)
|
|
|
except web.HTTPError:
|
|
|
# WebSockets don't response to traditional error codes so we
|
|
|
# close the connection.
|
|
|
if not self.stream.closed():
|
|
|
self.stream.close()
|
|
|
self.close()
|
|
|
else:
|
|
|
self.shell_stream.on_recv(self._on_zmq_reply)
|
|
|
|
|
|
def on_message(self, msg):
|
|
|
if len(msg) < self.max_msg_size:
|
|
|
msg = jsonapi.loads(msg)
|
|
|
self.session.send(self.shell_stream, msg)
|
|
|
|
|
|
def on_close(self):
|
|
|
# Make sure the stream exists and is not already closed.
|
|
|
if self.shell_stream is not None and not self.shell_stream.closed():
|
|
|
self.shell_stream.close()
|
|
|
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Notebook web service handlers
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class NotebookRootHandler(AuthenticatedHandler):
|
|
|
|
|
|
@authenticate_unless_readonly
|
|
|
def get(self):
|
|
|
|
|
|
nbm = self.application.notebook_manager
|
|
|
files = nbm.list_notebooks()
|
|
|
self.finish(jsonapi.dumps(files))
|
|
|
|
|
|
@web.authenticated
|
|
|
def post(self):
|
|
|
nbm = self.application.notebook_manager
|
|
|
body = self.request.body.strip()
|
|
|
format = self.get_argument('format', default='json')
|
|
|
name = self.get_argument('name', default=None)
|
|
|
if body:
|
|
|
notebook_id = nbm.save_new_notebook(body, name=name, format=format)
|
|
|
else:
|
|
|
notebook_id = nbm.new_notebook()
|
|
|
self.set_header('Location', '/'+notebook_id)
|
|
|
self.finish(jsonapi.dumps(notebook_id))
|
|
|
|
|
|
|
|
|
class NotebookHandler(AuthenticatedHandler):
|
|
|
|
|
|
SUPPORTED_METHODS = ('GET', 'PUT', 'DELETE')
|
|
|
|
|
|
@authenticate_unless_readonly
|
|
|
def get(self, notebook_id):
|
|
|
nbm = self.application.notebook_manager
|
|
|
format = self.get_argument('format', default='json')
|
|
|
last_mod, name, data = nbm.get_notebook(notebook_id, format)
|
|
|
|
|
|
if format == u'json':
|
|
|
self.set_header('Content-Type', 'application/json')
|
|
|
self.set_header('Content-Disposition','attachment; filename="%s.ipynb"' % name)
|
|
|
elif format == u'py':
|
|
|
self.set_header('Content-Type', 'application/x-python')
|
|
|
self.set_header('Content-Disposition','attachment; filename="%s.py"' % name)
|
|
|
self.set_header('Last-Modified', last_mod)
|
|
|
self.finish(data)
|
|
|
|
|
|
@web.authenticated
|
|
|
def put(self, notebook_id):
|
|
|
nbm = self.application.notebook_manager
|
|
|
format = self.get_argument('format', default='json')
|
|
|
name = self.get_argument('name', default=None)
|
|
|
nbm.save_notebook(notebook_id, self.request.body, name=name, format=format)
|
|
|
self.set_status(204)
|
|
|
self.finish()
|
|
|
|
|
|
@web.authenticated
|
|
|
def delete(self, notebook_id):
|
|
|
nbm = self.application.notebook_manager
|
|
|
nbm.delete_notebook(notebook_id)
|
|
|
self.set_status(204)
|
|
|
self.finish()
|
|
|
|
|
|
|
|
|
class NotebookCopyHandler(AuthenticatedHandler):
|
|
|
|
|
|
@web.authenticated
|
|
|
def get(self, notebook_id):
|
|
|
nbm = self.application.notebook_manager
|
|
|
project = nbm.notebook_dir
|
|
|
notebook_id = nbm.copy_notebook(notebook_id)
|
|
|
self.render(
|
|
|
'notebook.html', project=project,
|
|
|
notebook_id=notebook_id,
|
|
|
base_project_url=u'/', base_kernel_url=u'/',
|
|
|
kill_kernel=False,
|
|
|
read_only=False,
|
|
|
logged_in=self.logged_in,
|
|
|
login_available=self.login_available,
|
|
|
mathjax_url=self.application.ipython_app.mathjax_url,
|
|
|
)
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# RST web service handlers
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class RSTHandler(AuthenticatedHandler):
|
|
|
|
|
|
@web.authenticated
|
|
|
def post(self):
|
|
|
if publish_string is None:
|
|
|
raise web.HTTPError(503, u'docutils not available')
|
|
|
body = self.request.body.strip()
|
|
|
source = body
|
|
|
# template_path=os.path.join(os.path.dirname(__file__), u'templates', u'rst_template.html')
|
|
|
defaults = {'file_insertion_enabled': 0,
|
|
|
'raw_enabled': 0,
|
|
|
'_disable_config': 1,
|
|
|
'stylesheet_path': 0
|
|
|
# 'template': template_path
|
|
|
}
|
|
|
try:
|
|
|
html = publish_string(source, writer_name='html',
|
|
|
settings_overrides=defaults
|
|
|
)
|
|
|
except:
|
|
|
raise web.HTTPError(400, u'Invalid RST')
|
|
|
print html
|
|
|
self.set_header('Content-Type', 'text/html')
|
|
|
self.finish(html)
|
|
|
|
|
|
|
|
|
|
