File size: 1,952 Bytes
1905805 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | import asyncio
from typing import List, AsyncGenerator
'''ObserverClient asynchronously handles events in queue populated by an ObserverServer'''
class BaseObserverClient():
def __init__(self, server = None):
self.server = None
if server:
self.listen(server)
self.queue = asyncio.Queue()
self.event_listener = None
def listen(self, server):
if self.server:
self.close()
self.server = server
self.server.join(self)
self.event_listener = asyncio.create_task(self._event_listener())
def close(self):
self.server.detach(self)
self.server = None
async def _event_listener(self):
while True:
next_event = await self.queue.get()
await self.handle_event(next_event['event'], next_event['payload'])
# To Be Implement
async def handle_event(self, event_id: str, payload) -> None:
raise NotImplementedError
'''ObserverServer adds events and payloads to all listening client queues.'''
class ObserverServer():
def __init__(self):
self.clients: List[ObserverClient] = []
def join(self, client):
if client not in self.clients:
self.clients.append(client)
def detach(self, client):
if client in self.clients:
self.clients.remove(client)
async def broadcast_event(self, event_id: str, payload: dict = {}):
for client in self.clients:
await client.queue.put({
"event": event_id,
"payload": payload
})
async def broadcast_stream(self, event_id: str, payload_stream: AsyncGenerator):
async for payload in payload_stream:
for client in self.clients:
await client.queue.put({
"event": event_id,
"payload": payload
}) |