async def get_tracking_pairs(self) -> Dict[str, OrderBookTrackerEntry]:
# Get the currently active markets
async with aiohttp.ClientSession() as client:
trading_pairs: List[str] = await self.get_trading_pairs()
retval: Dict[str, OrderBookTrackerEntry] = {}
number_of_pairs: int = len(trading_pairs)
for index, trading_pair in enumerate(trading_pairs):
try:
snapshot: Dict[str, Any] = await self.get_snapshot(
client, trading_pair, 1000)
snapshot_timestamp: float = time.time()
snapshot_msg: OrderBookMessage = BinanceOrderBook.snapshot_message_from_exchange(
snapshot,
snapshot_timestamp,
metadata={"trading_pair": trading_pair})
order_book: OrderBook = self.order_book_create_function()
order_book.apply_snapshot(snapshot_msg.bids,
snapshot_msg.asks,
snapshot_msg.update_id)
retval[trading_pair] = OrderBookTrackerEntry(
trading_pair, snapshot_timestamp, order_book)
self.logger().info(
f"Initialized order book for {trading_pair}. "
f"{index+1}/{number_of_pairs} completed.")
# Each 1000 limit snapshot costs 10 requests and Binance rate limit is 20 requests per second.
await asyncio.sleep(1.0)
except Exception:
self.logger().error(
f"Error getting snapshot for {trading_pair}. ",
exc_info=True)
await asyncio.sleep(5)
return retval
async def listen_for_order_book_snapshots(self, ev_loop: asyncio.BaseEventLoop, output: asyncio.Queue):
while True:
try:
async with aiohttp.ClientSession() as client:
for trading_pair in self._trading_pairs:
try:
snapshot: Dict[str, Any] = await self.get_snapshot(client, trading_pair)
snapshot_timestamp: float = time.time()
snapshot_msg: OrderBookMessage = BinanceOrderBook.snapshot_message_from_exchange(
snapshot,
snapshot_timestamp,
metadata={"trading_pair": trading_pair}
)
output.put_nowait(snapshot_msg)
self.logger().debug(f"Saved order book snapshot for {trading_pair}")
# Be careful not to go above Binance's API rate limits.
await asyncio.sleep(5.0)
except asyncio.CancelledError:
raise
except Exception:
self.logger().error("Unexpected error.", exc_info=True)
await asyncio.sleep(5.0)
this_hour: pd.Timestamp = pd.Timestamp.utcnow().replace(minute=0, second=0, microsecond=0)
next_hour: pd.Timestamp = this_hour + pd.Timedelta(hours=1)
delta: float = next_hour.timestamp() - time.time()
await asyncio.sleep(delta)
except asyncio.CancelledError:
raise
except Exception:
self.logger().error("Unexpected error.", exc_info=True)
await asyncio.sleep(5.0)
async def get_new_order_book(self, trading_pair: str) -> OrderBook:
async with aiohttp.ClientSession() as client:
snapshot: Dict[str, Any] = await self.get_snapshot(client, trading_pair, 1000)
snapshot_timestamp: float = time.time()
snapshot_msg: OrderBookMessage = BinanceOrderBook.snapshot_message_from_exchange(
snapshot,
snapshot_timestamp,
metadata={"trading_pair": trading_pair}
)
order_book = self.order_book_create_function()
order_book.apply_snapshot(snapshot_msg.bids, snapshot_msg.asks, snapshot_msg.update_id)
return order_book
