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import logging
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import os
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import zmq
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# Install the pyzmq ioloop. This has to be done before anything else from
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# tornado is imported.
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from zmq.eventloop import ioloop
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import tornado.ioloop
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tornado.ioloop = ioloop
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from tornado import httpserver
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from tornado import options
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from tornado import web
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from kernelmanager import KernelManager
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from handlers import (
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MainHandler, KernelHandler, KernelActionHandler, ZMQStreamHandler,
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NotebookRootHandler, NotebookHandler
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)
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from routers import IOPubStreamRouter, ShellStreamRouter
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options.define("port", default=8888, help="run on the given port", type=int)
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_kernel_id_regex = r"(?P<kernel_id>\w+-\w+-\w+-\w+-\w+)"
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_kernel_action_regex = r"(?P<action>restart|interrupt)"
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class NotebookWebApplication(web.Application):
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def __init__(self):
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handlers = [
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(r"/", MainHandler),
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(r"/kernels", KernelHandler),
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(r"/kernels/%s/%s" % (_kernel_id_regex, _kernel_action_regex), KernelActionHandler),
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(r"/kernels/%s/iopub" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='iopub')),
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(r"/kernels/%s/shell" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='shell')),
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(r"/notebooks", NotebookRootHandler),
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(r"/notebooks/([^/]+)", NotebookHandler)
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]
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settings = dict(
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template_path=os.path.join(os.path.dirname(__file__), "templates"),
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static_path=os.path.join(os.path.dirname(__file__), "static"),
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)
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web.Application.__init__(self, handlers, **settings)
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self.context = zmq.Context()
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self.kernel_manager = KernelManager(self.context)
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self._session_dict = {}
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self._routers = {}
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#-------------------------------------------------------------------------
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# Methods for managing kernels and sessions
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#-------------------------------------------------------------------------
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@property
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def kernel_ids(self):
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return self.kernel_manager.kernel_ids
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def start_kernel(self):
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kernel_id = self.kernel_manager.start_kernel()
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logging.info("Kernel started: %s" % kernel_id)
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self.start_session(kernel_id)
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return kernel_id
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def interrupt_kernel(self, kernel_id):
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self.kernel_manager.interrupt_kernel(kernel_id)
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logging.info("Kernel interrupted: %s" % kernel_id)
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def restart_kernel(self, kernel_id):
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# Create the new kernel first so we can move the clients over.
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new_kernel_id = self.start_kernel()
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# Copy the clients over to the new routers.
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old_iopub_router = self.get_router(kernel_id, 'iopub')
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old_shell_router = self.get_router(kernel_id, 'shell')
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new_iopub_router = self.get_router(new_kernel_id, 'iopub')
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new_shell_router = self.get_router(new_kernel_id, 'shell')
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new_iopub_router.copy_clients(old_iopub_router)
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new_shell_router.copy_clients(old_shell_router)
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# Now shutdown the old session and the kernel.
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# TODO: This causes a hard crash in ZMQStream.close, which sets
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# self.socket to None to hastily. We will need to fix this in PyZMQ
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# itself. For now, we just leave the old kernel running :(
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# sm = self.kernel_manager.get_session_manager(kernel_id)
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# session_id = self._session_dict[kernel_id]
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# sm.stop_session(session_id)
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# self.kernel_manager.kill_kernel(kernel_id)
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logging.info("Kernel restarted")
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return new_kernel_id
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def start_session(self, kernel_id):
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sm = self.kernel_manager.get_session_manager(kernel_id)
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session_id = sm.start_session()
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self._session_dict[kernel_id] = session_id
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iopub_stream = sm.get_iopub_stream(session_id)
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shell_stream = sm.get_shell_stream(session_id)
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iopub_router = IOPubStreamRouter(iopub_stream)
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shell_router = ShellStreamRouter(shell_stream)
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self._routers[(kernel_id, session_id, 'iopub')] = iopub_router
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self._routers[(kernel_id, session_id, 'shell')] = shell_router
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logging.info("Session started: %s, %s" % (kernel_id, session_id))
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def stop_session(self, kernel_id):
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# TODO: finish this!
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sm = self.kernel_manager.get_session_manager(kernel_id)
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session_id = self._session_dict[kernel_id]
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def get_router(self, kernel_id, stream_name):
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session_id = self._session_dict[kernel_id]
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router = self._routers[(kernel_id, session_id, stream_name)]
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return router
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def launch_new_instance():
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options.parse_command_line()
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application = NotebookWebApplication()
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http_server = httpserver.HTTPServer(application)
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http_server.listen(options.options.port)
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print "IPython Notebook running at: http://127.0.0.1:8888"
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print "The github master of tornado is required to run this server:"
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print " https://github.com/facebook/tornado/tree/master/tornado"
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ioloop.IOLoop.instance().start()
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if __name__ == "__main__":
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main()
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