def eventSourceResource(self, request: IRequest) -> KleinRenderable:
"""
HTML5 EventSource endpoint.
"""
self._log.debug("Event source connected: {id}", id=id(request))
request.setHeader(
HeaderName.contentType.value, ContentType.eventStream.value
)
self.storeObserver.addListener(request)
def disconnected(f: Failure) -> None:
f.trap(ConnectionDone)
self._log.debug("Event source disconnected: {id}", id=id(request))
self.storeObserver.removeListener(request)
def finished(_: Any) -> None:
# We don't expect anything to fire the returned deferred, so
# this should never happen.
self.storeObserver.removeListener(request)
raise AssertionError("This was not expected")
# Handle disconnect
request.notifyFinish().addCallbacks(finished, disconnected)
# Return an unfired deferred, so the connection doesn't close on this
# end...
return Deferred()
def eventSourceResource(self, request: IRequest) -> KleinRenderable:
"""
HTML5 EventSource endpoint.
"""
self._log.debug("Event source connected: {id}", id=id(request))
request.setHeader(
HeaderName.contentType.value, ContentType.eventStream.value
)
self.storeObserver.addListener(request)
def disconnected(f: Failure) -> None:
f.trap(ConnectionDone)
self._log.debug("Event source disconnected: {id}", id=id(request))
self.storeObserver.removeListener(request)
def finished(_: Any) -> None:
# We don't expect anything to fire the returned deferred, so
# this should never happen.
self.storeObserver.removeListener(request)
raise AssertionError("This was not expected")
# Handle disconnect
request.notifyFinish().addCallbacks(finished, disconnected)
# Return an unfired deferred, so the connection doesn't close on this
# end...
return Deferred()
def __init__(self, request: IRequest, frameAncestors: str,
userAgent: UserAgent):
super().__init__(request, frameAncestors, userAgent)
# Present entire page before deciding whether and how to send it
# to the client.
self.__buffer = BytesIO()
self.__writeBytes = self.__buffer.write
self.__connectionLostFailure: Optional[Failure] = None
d = request.notifyFinish()
d.addErrback(self.__connectionLost)
