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import asyncio
import json
import logging
import os
from typing import Type
from ttun_server.redis import RedisConnectionPool
from ttun_server.types import Message
logger = logging.getLogger(__name__)
class BaseProxyQueue:
def __init__(self, identifier: str):
self.identifier = identifier
@classmethod
async def create_for_identifier(cls, identifier: str) -> 'BaseProxyQueue':
raise NotImplementedError(f'Please implement create_for_identifier')
@classmethod
async def get_for_identifier(cls, identifier: str) -> Type['self']:
assert await cls.has_connection(identifier)
return cls(identifier)
@classmethod
async def has_connection(cls, identifier) -> bool:
raise NotImplementedError(f'Please implement has_connection')
async def enqueue(self, message: Message):
raise NotImplementedError(f'Please implement send_request')
async def dequeue(self) -> Message:
raise NotImplementedError(f'Please implement handle_requests')
async def delete(self):
raise NotImplementedError(f'Please implement delete')
class MemoryProxyQueue(BaseProxyQueue):
connections: dict[str, asyncio.Queue] = {}
@classmethod
async def has_connection(cls, identifier) -> bool:
return identifier in cls.connections
@classmethod
async def create_for_identifier(cls, identifier: str) -> 'MemoryProxyQueue':
instance = cls(identifier)
cls.connections[identifier] = asyncio.Queue()
return instance
async def enqueue(self, message: Message):
return await self.__class__.connections[self.identifier].put(message)
async def dequeue(self) -> Message:
return await self.__class__.connections[self.identifier].get()
async def delete(self):
del self.__class__.connections[self.identifier]
class RedisProxyQueue(BaseProxyQueue):
def __init__(self, identifier):
super().__init__(identifier)
self.pubsub = RedisConnectionPool()\
.get_connection()\
.pubsub()
self.subscription_queue = asyncio.Queue()
@classmethod
async def create_for_identifier(cls, identifier: str) -> 'BaseProxyQueue':
instance = cls(identifier)
await instance.pubsub.subscribe(f'request_{identifier}')
return instance
@classmethod
async def get_for_identifier(cls, identifier: str) -> 'RedisProxyQueue':
instance: 'RedisProxyQueue' = await super().get_for_identifier(identifier)
await instance.pubsub.subscribe(f'response_{identifier}')
return instance
@classmethod
async def has_connection(cls, identifier) -> bool:
logger.debug(await RedisConnectionPool.get_connection().pubsub_channels())
return f'request_{identifier}' in {
channel.decode()
for channel
in await RedisConnectionPool \
.get_connection() \
.pubsub_channels()
}
async def wait_for_message(self):
async for message in self.pubsub.listen():
match message['type']:
case 'subscribe':
continue
case _:
return message['data']
async def enqueue(self, message: Message):
await RedisConnectionPool \
.get_connection() \
.publish(self.identifier, json.dumps(message))
async def dequeue(self) -> Message:
message = await self.wait_for_message()
return json.loads(message)
async def delete(self):
await self.pubsub.unsubscribe(f'request_{self.identifier}')
await RedisConnectionPool.get_connection()\
.srem('connections', self.identifier)
class ProxyQueueMeta(type):
def __new__(cls, name, superclasses, attributes):
return RedisProxyQueue \
if 'REDIS_URL' in os.environ \
else MemoryProxyQueue
class ProxyQueue(BaseProxyQueue, metaclass=ProxyQueueMeta):
pass
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