async def _broadcaster_evaluate(self, addr, commands):
search_replies = []
version_requested = False
for command in commands:
if isinstance(command, ca.VersionRequest):
version_requested = True
elif isinstance(command, ca.SearchRequest):
pv_name = command.name
try:
known_pv = self[pv_name] is not None
except KeyError:
known_pv = False
if known_pv:
# responding with an IP of `None` tells client to get IP
# address from the datagram.
search_replies.append(
ca.SearchResponse(self.port, None, command.cid,
ca.DEFAULT_PROTOCOL_VERSION)
)
if search_replies:
if version_requested:
bytes_to_send = self.broadcaster.send(ca.VersionResponse(13),
*search_replies)
else:
bytes_to_send = self.broadcaster.send(*search_replies)
for udp_sock in self.udp_socks.values():
try:
await udp_sock.sendto(bytes_to_send, addr)
except OSError as exc:
host, port = addr
raise CaprotoNetworkError(f"Failed to send to {host}:{port}") from exc
async def _broadcaster_queue_iteration(self, addr, messages):
self.broadcaster.process_commands(messages)
found_pv_to_cid = {}
saw_empty_channel_list = False
for message in messages:
if isinstance(message, pva.SearchRequest):
if len(message.channels) == 0:
# This is apparently a special "I'm looking for servers"
# message
saw_empty_channel_list = True
for channel in message.channels:
try:
channel['id']
name = channel['channel_name']
self[name]
except KeyError:
...
else:
found_pv_to_cid[name] = channel['id']
if found_pv_to_cid or saw_empty_channel_list:
search_replies = [
self.broadcaster.search_response(pv_to_cid=found_pv_to_cid, )
]
bytes_to_send = self.broadcaster.send(*search_replies)
# TODO: why send this back on all sockets?
for udp_sock in self.udp_socks.values():
try:
await udp_sock.sendto(bytes_to_send, addr)
except OSError as exc:
host, port = addr
raise CaprotoNetworkError(
f"Failed to send to {host}:{port}") from exc