mirror of
https://github.com/aljazceru/bitfinex-api-py.git
synced 2025-12-19 14:54:21 +01:00
109 lines
3.9 KiB
Python
109 lines
3.9 KiB
Python
from typing import Literal, TypeVar, Callable, cast
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import asyncio, json, uuid, websockets
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from ..handlers import PublicChannelsHandler
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from ..exceptions import ConnectionNotOpen, TooManySubscriptions
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_HEARTBEAT = "hb"
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F = TypeVar("F", bound=Callable[..., Literal[None]])
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def _require_websocket_connection(function: F) -> F:
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async def wrapper(self, *args, **kwargs):
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if self.websocket is None or not self.websocket.open:
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raise ConnectionNotOpen("No open connection with the server.")
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await function(self, *args, **kwargs)
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return cast(F, wrapper)
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class BfxWebsocketBucket:
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VERSION = 2
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MAXIMUM_SUBSCRIPTIONS_AMOUNT = 25
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def __init__(self, host, event_emitter):
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self.host, self.event_emitter, self.on_open_event = host, event_emitter, asyncio.locks.Event()
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self.websocket, self.subscriptions, self.pendings = None, {}, []
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self.handler = PublicChannelsHandler(event_emitter=self.event_emitter)
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async def connect(self):
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async def _connection():
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async with websockets.connect(self.host) as websocket:
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self.websocket = websocket
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self.on_open_event.set()
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await self.__recover_state()
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async for message in websocket:
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message = json.loads(message)
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if isinstance(message, dict):
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if message["event"] == "subscribed" and (chan_id := message["chanId"]):
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self.pendings = \
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[ pending for pending in self.pendings if pending["subId"] != message["subId"] ]
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self.subscriptions[chan_id] = message
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self.event_emitter.emit("subscribed", message)
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elif message["event"] == "unsubscribed" and (chan_id := message["chanId"]):
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if message["status"] == "OK":
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del self.subscriptions[chan_id]
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elif message["event"] == "error":
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self.event_emitter.emit("wss-error", message["code"], message["msg"])
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if isinstance(message, list):
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if (chan_id := message[0]) and message[1] != _HEARTBEAT:
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self.handler.handle(self.subscriptions[chan_id], *message[1:])
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try:
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await _connection()
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except websockets.exceptions.ConnectionClosedError as error:
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if error.code in (1006, 1012):
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self.on_open_event.clear()
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async def __recover_state(self):
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for pending in self.pendings:
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await self.websocket.send(json.dumps(pending))
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for _, subscription in self.subscriptions.items():
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await self.subscribe(**subscription)
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self.subscriptions.clear()
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@_require_websocket_connection
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async def subscribe(self, channel, sub_id=None, **kwargs):
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if len(self.subscriptions) + len(self.pendings) == BfxWebsocketBucket.MAXIMUM_SUBSCRIPTIONS_AMOUNT:
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raise TooManySubscriptions("The client has reached the maximum number of subscriptions.")
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subscription = {
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**kwargs,
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"event": "subscribe",
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"channel": channel,
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"subId": sub_id or str(uuid.uuid4()),
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}
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self.pendings.append(subscription)
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await self.websocket.send(json.dumps(subscription))
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@_require_websocket_connection
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async def unsubscribe(self, chan_id):
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await self.websocket.send(json.dumps({
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"event": "unsubscribe",
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"chanId": chan_id
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}))
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@_require_websocket_connection
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async def close(self, code=1000, reason=str()):
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await self.websocket.close(code=code, reason=reason)
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def get_chan_id(self, sub_id):
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for subscription in self.subscriptions.values():
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if subscription["subId"] == sub_id:
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return subscription["chanId"]
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