bokeh.client.connection

Implements a very low level facility for communicating with a Bokeh Server.

Users will always want to use ClientSession instead for standard usage.

class ClientConnection(session: ClientSession, websocket_url: str, io_loop: IOLoop | None = None, arguments: Dict[str, str] | None = None, max_message_size: int = 20971520)

A low-level class used to connect to a Bokeh server.

Public Data Attributes:

connected	Whether we've connected the Websocket and have exchanged initial handshake messages.
io_loop	The Tornado IOLoop this connection is using.
url	The URL of the websocket this Connection is to.
error_reason	The reason of the connection loss encoded as a DISCONNECTED.ErrorReason enum value
error_code	If there was an error that caused a disconnect, this property holds the error code.
error_detail	If there was an error that caused a disconnect, this property holds the error detail.

Public Methods:

__init__(session, websocket_url[, io_loop, ...])	Opens a websocket connection to the server.
connect()
close([why])	Close the Websocket connection.
force_roundtrip()	Force a round-trip request/reply to the server, sometimes needed to avoid race conditions.
loop_until_closed()	Execute a blocking loop that runs and executes event callbacks until the connection is closed (e.g.
pull_doc(document)	Pull a document from the server, overwriting the passed-in document
push_doc(document)	Push a document to the server, overwriting any existing server-side doc.
request_server_info()	Ask for information about the server.
send_message(message)

---

__init__(session: ClientSession, websocket_url: str, io_loop: IOLoop | None = None, arguments: Dict[str, str] | None = None, max_message_size: int = 20971520) → None

Opens a websocket connection to the server.

close(why: str = 'closed') → None

Close the Websocket connection.

force_roundtrip() → None

Force a round-trip request/reply to the server, sometimes needed to avoid race conditions. Mostly useful for testing.

Outside of test suites, this method hurts performance and should not be needed.

Returns

None

loop_until_closed() → None

Execute a blocking loop that runs and executes event callbacks until the connection is closed (e.g. by hitting Ctrl-C).

While this method can be used to run Bokeh application code “outside” the Bokeh server, this practice is HIGHLY DISCOURAGED for any real use case.

pull_doc(document: Document) → None

Pull a document from the server, overwriting the passed-in document

Parameters

document – (Document) The document to overwrite with server content.

Returns

None

push_doc(document: Document) → Message[Any]

Push a document to the server, overwriting any existing server-side doc.

Parameters

document – (Document) A Document to push to the server

Returns

The server reply

request_server_info() → ServerInfo

Ask for information about the server.

Returns

A dictionary of server attributes.

property connected: bool

Whether we’ve connected the Websocket and have exchanged initial handshake messages.

property error_code: int | None

If there was an error that caused a disconnect, this property holds the error code. None otherwise.

property error_detail: str

If there was an error that caused a disconnect, this property holds the error detail. Empty string otherwise.

property error_reason: ErrorReason | None

The reason of the connection loss encoded as a DISCONNECTED.ErrorReason enum value

property io_loop: tornado.ioloop.IOLoop

The Tornado IOLoop this connection is using.

property url: str

The URL of the websocket this Connection is to.

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