Creating files to new notebook app.

IPython/frontend/html/notebook/notebookapp.py

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+import datetime
+import json
+import logging
+import os
+import urllib
+import uuid
+from Queue import Queue
+
+import zmq
+
+# Install the pyzmq ioloop. This has to be done before anything else from
+# tornado is imported.
+from zmq.eventloop import ioloop
+import tornado.ioloop
+tornado.ioloop = ioloop
+
+from tornado import httpserver
+from tornado import options
+from tornado import web
+from tornado import websocket
+
+from kernelmanager import KernelManager
+
+options.define("port", default=8888, help="run on the given port", type=int)
+
+_kernel_id_regex = r"(?P<kernel_id>\w+-\w+-\w+-\w+-\w+)"
+_kernel_action_regex = r"(?P<action>restart|interrupt)"
+
+class MainHandler(web.RequestHandler):
+    def get(self):
+        self.render('notebook.html')
+
+
+class KernelHandler(web.RequestHandler):
+
+    def get(self):
+        self.write(json.dumps(self.application.kernel_ids))
+
+    def post(self):
+        kernel_id = self.application.start_kernel()
+        self.write(json.dumps(kernel_id))
+
+
+class KernelActionHandler(web.RequestHandler):
+
+    def post(self, kernel_id, action):
+        # TODO: figure out a better way of handling RPC style calls.
+        if action == 'interrupt':
+            self.application.interrupt_kernel(kernel_id)
+        if action == 'restart':
+            new_kernel_id = self.application.restart_kernel(kernel_id)
+            self.write(json.dumps(new_kernel_id))
+
+
+class ZMQStreamRouter(object):
+
+    def __init__(self, zmq_stream):
+        self.zmq_stream = zmq_stream
+        self._clients = {}
+        self.zmq_stream.on_recv(self._on_zmq_reply)
+
+    def register_client(self, client):
+        client_id = uuid.uuid4()
+        self._clients[client_id] = client
+        return client_id
+
+    def unregister_client(self, client_id):
+        del self._clients[client_id]
+
+    def copy_clients(self, router):
+        # Copy the clients of another router.
+        for client_id, client in router._clients.items():
+            client.router = self
+            self._clients[client_id] = client
+
+
+class IOPubStreamRouter(ZMQStreamRouter):
+
+    def _on_zmq_reply(self, msg_list):
+        for client_id, client in self._clients.items():
+            for msg in msg_list:
+                client.write_message(msg)
+
+    def forward_unicode(self, client_id, msg):
+        # This is a SUB stream that we should never write to.
+        pass
+
+
+class ShellStreamRouter(ZMQStreamRouter):
+
+    def __init__(self, zmq_stream):
+        ZMQStreamRouter.__init__(self, zmq_stream)
+        self._request_queue = Queue()
+
+    def _on_zmq_reply(self, msg_list):
+        client_id = self._request_queue.get(block=False)
+        client = self._clients.get(client_id)
+        if client is not None:
+            for msg in msg_list:
+                client.write_message(msg)
+
+    def forward_unicode(self, client_id, msg):
+        self._request_queue.put(client_id)
+        self.zmq_stream.send_unicode(msg)
+
+
+class ZMQStreamHandler(websocket.WebSocketHandler):
+
+    def initialize(self, stream_name):
+        self.stream_name = stream_name
+
+    def open(self, kernel_id):
+        self.router = self.application.get_router(kernel_id, self.stream_name)
+        self.client_id = self.router.register_client(self)
+        logging.info("Connection open: %s, %s" % (kernel_id, self.client_id))
+
+    def on_message(self, msg):
+        self.router.forward_unicode(self.client_id, msg)
+
+    def on_close(self):
+        self.router.unregister_client(self.client_id)
+        logging.info("Connection closed: %s" % self.client_id)
+
+
+class NotebookRootHandler(web.RequestHandler):
+
+    def get(self):
+        files = os.listdir(os.getcwd())
+        files = [file for file in files if file.endswith(".ipynb")]
+        self.write(json.dumps(files))
+
+
+class NotebookHandler(web.RequestHandler):
+
+    SUPPORTED_METHODS = ("GET", "DELETE", "PUT")
+
+    def find_path(self, filename):
+        filename = urllib.unquote(filename)
+        if not filename.endswith('.ipynb'):
+            raise web.HTTPError(400)
+        path = os.path.join(os.getcwd(), filename)
+        return path
+
+    def get(self, filename):
+        path = self.find_path(filename)
+        if not os.path.isfile(path):
+            raise web.HTTPError(404)
+        info = os.stat(path)
+        self.set_header("Content-Type", "application/unknown")
+        self.set_header("Last-Modified", datetime.datetime.utcfromtimestamp(
+            info.st_mtime))
+        f = open(path, "r")
+        try:
+            self.finish(f.read())
+        finally:
+            f.close()
+
+    def put(self, filename):
+        path = self.find_path(filename)
+        f = open(path, "w")
+        f.write(self.request.body)
+        f.close()
+        self.finish()
+
+    def delete(self, filename):
+        path = self.find_path(filename)
+        if not os.path.isfile(path):
+            raise web.HTTPError(404)
+        os.unlink(path)
+        self.set_status(204)
+        self.finish()
+
+
+class NotebookApplication(web.Application):
+
+    def __init__(self):
+        handlers = [
+            (r"/", MainHandler),
+            (r"/kernels", KernelHandler),
+            (r"/kernels/%s/%s" % (_kernel_id_regex, _kernel_action_regex), KernelActionHandler),
+            (r"/kernels/%s/iopub" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='iopub')),
+            (r"/kernels/%s/shell" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='shell')),
+            (r"/notebooks", NotebookRootHandler),
+            (r"/notebooks/([^/]+)", NotebookHandler)
+        ]
+        settings = dict(
+            template_path=os.path.join(os.path.dirname(__file__), "templates"),
+            static_path=os.path.join(os.path.dirname(__file__), "static"),
+        )
+        web.Application.__init__(self, handlers, **settings)
+
+        self.context = zmq.Context()
+        self.kernel_manager = KernelManager(self.context)
+        self._session_dict = {}
+        self._routers = {}
+
+    #-------------------------------------------------------------------------
+    # Methods for managing kernels and sessions
+    #-------------------------------------------------------------------------
+
+    @property
+    def kernel_ids(self):
+        return self.kernel_manager.kernel_ids
+
+    def start_kernel(self):
+        kernel_id = self.kernel_manager.start_kernel()
+        logging.info("Kernel started: %s" % kernel_id)
+        self.start_session(kernel_id)
+        return kernel_id
+
+    def interrupt_kernel(self, kernel_id):
+        self.kernel_manager.interrupt_kernel(kernel_id)
+        logging.info("Kernel interrupted: %s" % kernel_id)
+
+    def restart_kernel(self, kernel_id):
+        # Create the new kernel first so we can move the clients over.
+        new_kernel_id = self.start_kernel()
+
+        # Copy the clients over to the new routers.
+        old_iopub_router = self.get_router(kernel_id, 'iopub')
+        old_shell_router = self.get_router(kernel_id, 'shell')
+        new_iopub_router = self.get_router(new_kernel_id, 'iopub')
+        new_shell_router = self.get_router(new_kernel_id, 'shell')
+        new_iopub_router.copy_clients(old_iopub_router)
+        new_shell_router.copy_clients(old_shell_router)
+
+        # Now shutdown the old session and the kernel.
+        # TODO: This causes a hard crash in ZMQStream.close, which sets
+        # self.socket to None to hastily. We will need to fix this in PyZMQ
+        # itself. For now, we just leave the old kernel running :(
+        # sm = self.kernel_manager.get_session_manager(kernel_id)
+        # session_id = self._session_dict[kernel_id]
+        # sm.stop_session(session_id)
+        # self.kernel_manager.kill_kernel(kernel_id)
+
+        logging.info("Kernel restarted")
+        return new_kernel_id
+
+    def start_session(self, kernel_id):
+        sm = self.kernel_manager.get_session_manager(kernel_id)
+        session_id = sm.start_session()
+        self._session_dict[kernel_id] = session_id
+        iopub_stream = sm.get_iopub_stream(session_id)
+        shell_stream = sm.get_shell_stream(session_id)
+        iopub_router = IOPubStreamRouter(iopub_stream)
+        shell_router = ShellStreamRouter(shell_stream)
+        self._routers[(kernel_id, session_id, 'iopub')] = iopub_router
+        self._routers[(kernel_id, session_id, 'shell')] = shell_router
+        logging.info("Session started: %s, %s" % (kernel_id, session_id))
+
+    def stop_session(self, kernel_id):
+        # TODO: finish this!
+        sm = self.kernel_manager.get_session_manager(kernel_id)
+        session_id = self._session_dict[kernel_id]
+
+    def get_router(self, kernel_id, stream_name):
+        session_id = self._session_dict[kernel_id]
+        router = self._routers[(kernel_id, session_id, stream_name)]
+        return router
+
+
+def main():
+    options.parse_command_line()
+    application = NotebookApplication()
+    http_server = httpserver.HTTPServer(application)
+    http_server.listen(options.options.port)
+    print "IPython Notebook running at: http://127.0.0.1:8888"
+    print "The github master of tornado is required to run this server:"
+    print "    https://github.com/facebook/tornado/tree/master/tornado"
+    ioloop.IOLoop.instance().start()
+
+
+if __name__ == "__main__":
+    main()
+