Source code for bokeh.server.connection

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# Copyright (c) 2012 - 2021, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
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''' Provides the ``ServerSession`` class.

'''

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# Boilerplate
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from __future__ import annotations

import logging # isort:skip
log = logging.getLogger(__name__)

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# Imports
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# Standard library imports
from typing import TYPE_CHECKING, Any, Awaitable

## Bokeh imports
if TYPE_CHECKING:
    from ..document.events import DocumentPatchedEvent
    from ..protocol import Protocol, messages as msg
    from ..protocol.message import Message
    from .contexts import ApplicationContext
    from .session import ServerSession
    from .views.ws import WSHandler

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# Globals and constants
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__all__ = (
    'ServerConnection',
)

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# General API
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[docs]class ServerConnection: ''' Wraps a websocket connection to a client. .. autoclasstoc:: ''' _session: ServerSession | None def __init__(self, protocol: Protocol, socket: WSHandler, application_context: ApplicationContext, session: ServerSession) -> None: self._protocol = protocol self._socket = socket self._application_context = application_context self._session = session self._session.subscribe(self) self._ping_count = 0 @property def session(self) -> ServerSession: assert self._session is not None return self._session @property def application_context(self) -> ApplicationContext: return self._application_context
[docs] def detach_session(self) -> None: """Allow the session to be discarded and don't get change notifications from it anymore""" if self._session is not None: self._session.unsubscribe(self) self._session = None
def ok(self, message: Message[Any]) -> msg.ok: return self.protocol.create('OK', message.header['msgid']) def error(self, message: Message[Any], text: str) -> msg.error: return self.protocol.create('ERROR', message.header['msgid'], text)
[docs] def send_patch_document(self, event: DocumentPatchedEvent) -> Awaitable[None]: """ Sends a PATCH-DOC message, returning a Future that's completed when it's written out. """ msg = self.protocol.create('PATCH-DOC', [event]) # yes, *return* the awaitable, it will be awaited when pending writes are processed return self._socket.send_message(msg)
def send_ping(self) -> None: self._socket.ping(str(self._ping_count).encode("utf-8")) self._ping_count += 1 @property def protocol(self) -> Protocol: return self._protocol
#----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------