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"""Tornado handlers for the sessions web service."""
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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 json
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from tornado import web
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from ...base.handlers import IPythonHandler, json_errors
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from IPython.utils.jsonutil import date_default
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from IPython.html.utils import url_path_join, url_escape
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from IPython.kernel.kernelspec import NoSuchKernel
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class SessionRootHandler(IPythonHandler):
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@web.authenticated
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@json_errors
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def get(self):
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# Return a list of running sessions
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sm = self.session_manager
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sessions = sm.list_sessions()
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self.finish(json.dumps(sessions, default=date_default))
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@web.authenticated
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@json_errors
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def post(self):
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# Creates a new session
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#(unless a session already exists for the named nb)
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sm = self.session_manager
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cm = self.contents_manager
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km = self.kernel_manager
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model = self.get_json_body()
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if model is None:
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raise web.HTTPError(400, "No JSON data provided")
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try:
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path = model['notebook']['path']
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except KeyError:
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raise web.HTTPError(400, "Missing field in JSON data: notebook.path")
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try:
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kernel_name = model['kernel']['name']
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except KeyError:
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self.log.debug("No kernel name specified, using default kernel")
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kernel_name = None
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# Check to see if session exists
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if sm.session_exists(path=path):
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model = sm.get_session(path=path)
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else:
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try:
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model = sm.create_session(path=path, kernel_name=kernel_name)
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except NoSuchKernel:
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msg = ("The '%s' kernel is not available. Please pick another "
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"suitable kernel instead, or install that kernel." % kernel_name)
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status_msg = '%s not found' % kernel_name
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self.log.warn('Kernel not found: %s' % kernel_name)
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self.set_status(501)
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self.finish(json.dumps(dict(message=msg, short_message=status_msg)))
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return
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location = url_path_join(self.base_url, 'api', 'sessions', model['id'])
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self.set_header('Location', url_escape(location))
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self.set_status(201)
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self.finish(json.dumps(model, default=date_default))
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class SessionHandler(IPythonHandler):
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SUPPORTED_METHODS = ('GET', 'PATCH', 'DELETE')
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@web.authenticated
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@json_errors
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def get(self, session_id):
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# Returns the JSON model for a single session
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sm = self.session_manager
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model = sm.get_session(session_id=session_id)
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self.finish(json.dumps(model, default=date_default))
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@web.authenticated
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@json_errors
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def patch(self, session_id):
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# Currently, this handler is strictly for renaming notebooks
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sm = self.session_manager
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model = self.get_json_body()
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if model is None:
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raise web.HTTPError(400, "No JSON data provided")
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changes = {}
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if 'notebook' in model:
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notebook = model['notebook']
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if 'path' in notebook:
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changes['path'] = notebook['path']
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sm.update_session(session_id, **changes)
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model = sm.get_session(session_id=session_id)
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self.finish(json.dumps(model, default=date_default))
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@web.authenticated
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@json_errors
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def delete(self, session_id):
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# Deletes the session with given session_id
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sm = self.session_manager
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try:
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sm.delete_session(session_id)
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except KeyError:
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# the kernel was deleted but the session wasn't!
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raise web.HTTPError(410, "Kernel deleted before session")
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self.set_status(204)
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self.finish()
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#-----------------------------------------------------------------------------
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# URL to handler mappings
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#-----------------------------------------------------------------------------
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_session_id_regex = r"(?P<session_id>\w+-\w+-\w+-\w+-\w+)"
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default_handlers = [
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(r"/api/sessions/%s" % _session_id_regex, SessionHandler),
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(r"/api/sessions", SessionRootHandler)
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]
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