def _on_service_acceptance_event(self, event, server):
"""Handle a service invocation event."""
service_acceptance = event.service_acceptance
if service_acceptance is None:
return
call = service_acceptance.call
call.accept(self._completion_queue, call)
# TODO(nathaniel): Metadata support.
call.premetadata()
call.read(call)
method = service_acceptance.method.decode()
self._rpc_states[call] = _common.CommonRPCState(
_common.WriteState(_LowWrite.OPEN, _common.HighWrite.OPEN,
[]), 1, self._request_deserializers[method],
self._response_serializers[method])
ticket = tickets.FrontToBackPacket(
call, 0, tickets.Kind.COMMENCEMENT, method,
interfaces.ServicedSubscription.Kind.FULL, None, None,
service_acceptance.deadline - time.time())
self._rear_link.accept_front_to_back_ticket(ticket)
server.service(None)
def _invoke(self, operation_id, name, high_state, payload, timeout):
"""Invoke an RPC.
Args:
operation_id: Any object to be used as an operation ID for the RPC.
name: The RPC method name.
high_state: A _common.HighWrite value representing the "high write state"
of the RPC.
payload: A payload object for the RPC or None if no payload was given at
invocation-time.
timeout: A duration of time in seconds to allow for the RPC.
"""
request_serializer = self._request_serializers[name]
call = _low.Call(self._channel, self._completion_queue, name,
self._host,
time.time() + timeout)
if self._metadata_transformer is not None:
metadata = self._metadata_transformer([])
for metadata_key, metadata_value in metadata:
call.add_metadata(metadata_key, metadata_value)
call.invoke(self._completion_queue, operation_id, operation_id)
outstanding = set(_INVOCATION_EVENT_KINDS)
if payload is None:
if high_state is _common.HighWrite.CLOSED:
call.complete(operation_id)
low_state = _LowWrite.CLOSED
outstanding.add(_low.Event.Kind.COMPLETE_ACCEPTED)
else:
low_state = _LowWrite.OPEN
else:
serialized_payload = request_serializer(payload)
call.write(serialized_payload, operation_id)
outstanding.add(_low.Event.Kind.WRITE_ACCEPTED)
low_state = _LowWrite.ACTIVE
write_state = _common.WriteState(low_state, high_state, [])
common_state = _common.CommonRPCState(
write_state, 0, self._response_deserializers[name],
request_serializer)
self._rpc_states[operation_id] = _RPCState(call, outstanding, True,
common_state)
if not self._spinning:
self._pool.submit(self._spin, self._completion_queue)
self._spinning = True