bokeh.server.server

Provide basic Bokeh server objects that use a Tornado HTTPServer and BokeTornado Tornado Application to service Bokeh Server Applications. There are two public classes in this module:

BaseServer

This is a lightweight class to explicitly coordinate the components needed to run a Bokeh server (A BokehTornado instance, and Tornado HTTPServer and a Tornado IOLoop)

Server

This higher-level convenience class only needs to be configured with Bokeh Application instances, and will automatically create and coordinate the lower level Tornado components.

class BaseServer(io_loop, tornado_app, http_server)

Explicitly coordinate the level Tornado components required to run a Bokeh server:

• A Tornado IOLoop to run the Bokeh server machinery.

• a BokehTornado Tornado application that defines the Bokeh server machinery.

• a Tornado HTTPServer to direct HTTP requests

All three of these components must be passed to BaseServer, which will initialize the BokehTornado instance on the io_loop. The http_server must have been previously created and initialized with the BokehTornado instance.

__init__(io_loop, tornado_app, http_server)

Create a BaseServer instance.

Parameters

• io_loop (IOLoop) – A Tornado IOLoop to run the Bokeh Tornado application on.

• tornado_app (BokehTornado) – An instance of the Bokeh Tornado application that generates Bokeh Documents and Sessions.

• http_server (HTTPServer) – A Tornado HTTPServer to service HTTP requests for Bokeh applications. Should have already be configured with the tornado_app when created.

get_session(app_path, session_id)

Get an active a session by name application path and session ID.

Parameters

• app_path (str) – The configured application path for the application to return a session for.

• session_id (str) – The session ID of the session to retrieve.

Returns

ServerSession

get_sessions(app_path=None)

Gets all currently active sessions for applications.

Parameters

app_path (str, optional) – The configured application path for the application to return sessions for. If None, return active sessions for all applications. (default: None)

Returns

list[ServerSession]

run_until_shutdown()

Run the Bokeh Server until shutdown is requested by the user, either via a Keyboard interrupt (Ctrl-C) or SIGTERM.

Calling this method will start the Tornado IOLoop and block all execution in the calling process.

Returns

None

show(app_path, browser=None, new='tab')

Opens an app in a browser window or tab.

This method is useful for testing or running Bokeh server applications on a local machine but should not call when running Bokeh server for an actual deployment.

Parameters

• app_path (str) – the app path to open The part of the URL after the hostname:port, with leading slash.

• browser (str, optional) – browser to show with (default: None) For systems that support it, the browser argument allows specifying which browser to display in, e.g. “safari”, “firefox”, “opera”, “windows-default” (see the webbrowser module documentation in the standard lib for more details).

• new (str, optional) – window or tab (default: “tab”) If new is ‘tab’, then opens a new tab. If new is ‘window’, then opens a new window.

Returns

None

start()

Install the Bokeh Server and its background tasks on a Tornado IOLoop.

This method does not block and does not affect the state of the Tornado IOLoop You must start and stop the loop yourself, i.e. this method is typically useful when you are already explicitly managing an IOLoop yourself.

To start a Bokeh server and immediately “run forever” in a blocking manner, see run_until_shutdown().

stop(wait=True)

Stop the Bokeh Server.

This stops and removes all Bokeh Server IOLoop callbacks, as well as stops the HTTPServer that this instance was configured with.

Parameters

fast (bool) – Whether to wait for orderly cleanup (default: True)

Returns

None

unlisten()

Stop listening on ports. The server will no longer be usable after calling this function.

Returns

None

property io_loop

The Tornado IOLoop that this Bokeh Server is running on.

class Server(applications, io_loop=None, http_server_kwargs=None, **kwargs)

A high level convenience class to run a Bokeh server.

This class can automatically coordinate the three the base level components required to run a Bokeh server:

• A Tornado IOLoop to run the Bokeh server machinery.

• a BokehTornado Tornado application that defines the Bokeh server machinery.

• a Tornado HTTPServer to direct HTTP requests

This high level Server class has some limitations. In particular, it is not possible to set an explicit io_loop and num_procs other than 1 at the same time. To do that, it is necessary to use BaseServer and coordinate the three components above explicitly.

__init__(applications, io_loop=None, http_server_kwargs=None, **kwargs)

Create a Server instance.

Parameters

• applications (dict[str, Application] or Application or callable) –

  A mapping from URL paths to Application instances, or a single Application to put at the root URL.

  The Application is a factory for Documents, with a new Document initialized for each Session. Each application is identified by a path that corresponds to a URL, like “/” or “/myapp”

  If a single Application is provided, it is mapped to the URL path “/” automatically.

  As a convenience, a callable may also be provided, in which an Application will be created for it using FunctionHandler.

• io_loop (IOLoop, optional) – An explicit Tornado IOLoop to run Bokeh Server code on. If None, IOLoop.current() will be used (default: None)

• http_server_kwargs (dict, optional) –

  Extra arguments passed to tornado.httpserver.HTTPServer.

  E.g. max_buffer_size to specify the maximum upload size. More details can be found at:

  http://www.tornadoweb.org/en/stable/httpserver.html#http-server

  If None, no extra arguments are passed (default: None)

Additionally, the following options may be passed to configure the operation of Server:

Keyword Args:

address (String )

The address the server should listen on for HTTP requests. (default: None)

allow_websocket_origin (List ( String ))

A list of hosts that can connect to the websocket.

This is typically required when embedding a Bokeh server app in an external web site using server_document() or similar.

If None, “localhost” is used. (default: None)

index (String )

A path to a Jinja2 template to use for the index “/” (default: None)

num_procs (Int )

The number of worker processes to start for the HTTP server. If an explicit io_loop is also configured, then num_procs=1 is the only compatible value. Use BaseServer to coordinate an explicit IOLoop with a multi-process HTTP server.

A value of 0 will auto detect number of cores.

Note that due to limitations inherent in Tornado, Windows does not support num_procs values greater than one! In this case consider running multiple Bokeh server instances behind a load balancer. (default: 1)

port (Int )

The port number the server should listen on for HTTP requests. (default: 5006)

prefix (String )

A URL prefix to use for all Bokeh server paths. (default: ‘’)

ssl_certfile (String )

The path to a certificate file for SSL termination. (default: None)

ssl_keyfile (String )

The path to a private key file for SSL termination. (default: None)

ssl_password (String )

A password to decrypt the SSL keyfile, if necessary. (default: None)

use_xheaders (Bool )

Whether to have the Bokeh server override the remote IP and URI scheme and protocol for all requests with X-Real-Ip, X-Forwarded-For, X-Scheme, X-Forwarded-Proto headers (if they are provided). (default: False)

websocket_max_message_size (Int )

Set the Tornado websocket_max_message_size value. (default: 20971520)

Any remaining keyword arguments will be passed as-is to BokehTornado.

property address

The configured address that the server listens on for HTTP requests.

property index

A path to a Jinja2 template to use for index at “/”

property port

The configured port number that the server listens on for HTTP requests.

property prefix

The configured URL prefix to use for all Bokeh server paths.