✅ Binance (completed previously)
✅ Coinbase Pro (completed in task 12) ✅ Kraken (completed in task 12) ✅ Bybit (completed in this task) ✅ OKX (completed in this task) ✅ Huobi (completed in this task)
This commit is contained in:
Dobromir Popov
660
COBY/connectors/okx_connector.py
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660
COBY/connectors/okx_connector.py
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@ -0,0 +1,660 @@
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"""
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OKX exchange connector implementation.
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Supports WebSocket connections to OKX with their V5 API WebSocket streams.
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"""
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import json
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import hmac
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import hashlib
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import base64
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import time
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from typing import Dict, List, Optional, Any
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from datetime import datetime, timezone
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from ..models.core import OrderBookSnapshot, TradeEvent, PriceLevel
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from ..utils.logging import get_logger, set_correlation_id
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from ..utils.exceptions import ValidationError, ConnectionError
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from ..utils.validation import validate_symbol, validate_price, validate_volume
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from .base_connector import BaseExchangeConnector
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logger = get_logger(__name__)
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class OKXConnector(BaseExchangeConnector):
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"""
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OKX WebSocket connector implementation.
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Supports:
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- V5 API WebSocket streams
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- Order book streams
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- Trade streams
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- Symbol normalization
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- Authentication for private channels
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"""
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# OKX WebSocket URLs
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WEBSOCKET_URL = "wss://ws.okx.com:8443/ws/v5/public"
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WEBSOCKET_PRIVATE_URL = "wss://ws.okx.com:8443/ws/v5/private"
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DEMO_WEBSOCKET_URL = "wss://wspap.okx.com:8443/ws/v5/public?brokerId=9999"
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API_URL = "https://www.okx.com"
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def __init__(self, use_demo: bool = False, api_key: str = None,
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api_secret: str = None, passphrase: str = None):
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"""
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Initialize OKX connector.
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Args:
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use_demo: Whether to use demo environment
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api_key: API key for authentication (optional)
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api_secret: API secret for authentication (optional)
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passphrase: API passphrase for authentication (optional)
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"""
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websocket_url = self.DEMO_WEBSOCKET_URL if use_demo else self.WEBSOCKET_URL
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super().__init__("okx", websocket_url)
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# Authentication credentials (optional)
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self.api_key = api_key
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self.api_secret = api_secret
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self.passphrase = passphrase
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self.use_demo = use_demo
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# OKX-specific message handlers
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self.message_handlers.update({
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'books': self._handle_orderbook_update,
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'trades': self._handle_trade_update,
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'error': self._handle_error_message,
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'subscribe': self._handle_subscription_response,
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'unsubscribe': self._handle_subscription_response
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})
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# Subscription tracking
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self.subscribed_channels = set()
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logger.info(f"OKX connector initialized ({'demo' if use_demo else 'live'})")
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def _get_message_type(self, data: Dict) -> str:
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"""
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Determine message type from OKX message data.
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Args:
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data: Parsed message data
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Returns:
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str: Message type identifier
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"""
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# OKX V5 API message format
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if 'event' in data:
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return data['event'] # 'subscribe', 'unsubscribe', 'error'
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elif 'arg' in data and 'data' in data:
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# Data message
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channel = data['arg'].get('channel', '')
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return channel
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elif 'op' in data:
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return data['op'] # 'ping', 'pong'
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return 'unknown'
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def normalize_symbol(self, symbol: str) -> str:
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"""
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Normalize symbol to OKX format.
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Args:
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symbol: Standard symbol format (e.g., 'BTCUSDT')
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Returns:
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str: OKX symbol format (e.g., 'BTC-USDT')
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"""
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# OKX uses dash-separated format
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if symbol.upper() == 'BTCUSDT':
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return 'BTC-USDT'
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elif symbol.upper() == 'ETHUSDT':
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return 'ETH-USDT'
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elif symbol.upper().endswith('USDT'):
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base = symbol[:-4].upper()
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return f"{base}-USDT"
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elif symbol.upper().endswith('USD'):
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base = symbol[:-3].upper()
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return f"{base}-USD"
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else:
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# Assume it's already in correct format or add dash
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if '-' not in symbol:
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# Try to split common patterns
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if len(symbol) >= 6:
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# Assume last 4 chars are quote currency
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base = symbol[:-4].upper()
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quote = symbol[-4:].upper()
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return f"{base}-{quote}"
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else:
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return symbol.upper()
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else:
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return symbol.upper()
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def _denormalize_symbol(self, okx_symbol: str) -> str:
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"""
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Convert OKX symbol back to standard format.
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Args:
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okx_symbol: OKX symbol format (e.g., 'BTC-USDT')
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Returns:
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str: Standard symbol format (e.g., 'BTCUSDT')
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"""
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if '-' in okx_symbol:
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return okx_symbol.replace('-', '')
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return okx_symbol
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async def subscribe_orderbook(self, symbol: str) -> None:
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"""
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Subscribe to order book updates for a symbol.
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Args:
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symbol: Trading symbol (e.g., 'BTCUSDT')
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"""
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try:
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set_correlation_id()
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okx_symbol = self.normalize_symbol(symbol)
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# Create subscription message
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subscription_msg = {
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"op": "subscribe",
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"args": [
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{
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"channel": "books",
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"instId": okx_symbol
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}
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]
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}
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# Send subscription
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success = await self._send_message(subscription_msg)
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if success:
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# Track subscription
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if symbol not in self.subscriptions:
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self.subscriptions[symbol] = []
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if 'orderbook' not in self.subscriptions[symbol]:
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self.subscriptions[symbol].append('orderbook')
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self.subscribed_channels.add(f"books:{okx_symbol}")
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logger.info(f"Subscribed to order book for {symbol} ({okx_symbol}) on OKX")
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else:
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logger.error(f"Failed to subscribe to order book for {symbol} on OKX")
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except Exception as e:
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logger.error(f"Error subscribing to order book for {symbol}: {e}")
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raise
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async def subscribe_trades(self, symbol: str) -> None:
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"""
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Subscribe to trade updates for a symbol.
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Args:
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symbol: Trading symbol (e.g., 'BTCUSDT')
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"""
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try:
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set_correlation_id()
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okx_symbol = self.normalize_symbol(symbol)
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# Create subscription message
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subscription_msg = {
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"op": "subscribe",
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"args": [
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{
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"channel": "trades",
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"instId": okx_symbol
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}
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]
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}
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# Send subscription
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success = await self._send_message(subscription_msg)
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if success:
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# Track subscription
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if symbol not in self.subscriptions:
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self.subscriptions[symbol] = []
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if 'trades' not in self.subscriptions[symbol]:
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self.subscriptions[symbol].append('trades')
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self.subscribed_channels.add(f"trades:{okx_symbol}")
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logger.info(f"Subscribed to trades for {symbol} ({okx_symbol}) on OKX")
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else:
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logger.error(f"Failed to subscribe to trades for {symbol} on OKX")
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except Exception as e:
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logger.error(f"Error subscribing to trades for {symbol}: {e}")
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raise
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async def unsubscribe_orderbook(self, symbol: str) -> None:
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"""
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Unsubscribe from order book updates for a symbol.
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Args:
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symbol: Trading symbol (e.g., 'BTCUSDT')
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"""
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try:
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okx_symbol = self.normalize_symbol(symbol)
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# Create unsubscription message
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unsubscription_msg = {
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"op": "unsubscribe",
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"args": [
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{
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"channel": "books",
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"instId": okx_symbol
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}
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]
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}
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# Send unsubscription
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success = await self._send_message(unsubscription_msg)
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if success:
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# Remove from tracking
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if symbol in self.subscriptions and 'orderbook' in self.subscriptions[symbol]:
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self.subscriptions[symbol].remove('orderbook')
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if not self.subscriptions[symbol]:
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del self.subscriptions[symbol]
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self.subscribed_channels.discard(f"books:{okx_symbol}")
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logger.info(f"Unsubscribed from order book for {symbol} ({okx_symbol}) on OKX")
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else:
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logger.error(f"Failed to unsubscribe from order book for {symbol} on OKX")
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except Exception as e:
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logger.error(f"Error unsubscribing from order book for {symbol}: {e}")
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raise
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async def unsubscribe_trades(self, symbol: str) -> None:
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"""
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Unsubscribe from trade updates for a symbol.
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Args:
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symbol: Trading symbol (e.g., 'BTCUSDT')
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"""
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try:
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okx_symbol = self.normalize_symbol(symbol)
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# Create unsubscription message
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unsubscription_msg = {
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"op": "unsubscribe",
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"args": [
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{
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"channel": "trades",
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"instId": okx_symbol
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}
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]
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}
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# Send unsubscription
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success = await self._send_message(unsubscription_msg)
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if success:
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# Remove from tracking
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if symbol in self.subscriptions and 'trades' in self.subscriptions[symbol]:
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self.subscriptions[symbol].remove('trades')
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if not self.subscriptions[symbol]:
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del self.subscriptions[symbol]
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self.subscribed_channels.discard(f"trades:{okx_symbol}")
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logger.info(f"Unsubscribed from trades for {symbol} ({okx_symbol}) on OKX")
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else:
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logger.error(f"Failed to unsubscribe from trades for {symbol} on OKX")
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except Exception as e:
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logger.error(f"Error unsubscribing from trades for {symbol}: {e}")
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raise
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async def get_symbols(self) -> List[str]:
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"""
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Get list of available trading symbols from OKX.
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Returns:
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List[str]: List of available symbols in standard format
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"""
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try:
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import aiohttp
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api_url = "https://www.okx.com"
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async with aiohttp.ClientSession() as session:
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async with session.get(f"{api_url}/api/v5/public/instruments",
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params={"instType": "SPOT"}) as response:
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if response.status == 200:
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data = await response.json()
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if data.get('code') != '0':
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logger.error(f"OKX API error: {data.get('msg')}")
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return []
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symbols = []
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instruments = data.get('data', [])
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for instrument in instruments:
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if instrument.get('state') == 'live':
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inst_id = instrument.get('instId', '')
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# Convert to standard format
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standard_symbol = self._denormalize_symbol(inst_id)
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symbols.append(standard_symbol)
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logger.info(f"Retrieved {len(symbols)} symbols from OKX")
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return symbols
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else:
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logger.error(f"Failed to get symbols from OKX: HTTP {response.status}")
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return []
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except Exception as e:
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logger.error(f"Error getting symbols from OKX: {e}")
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return []
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async def get_orderbook_snapshot(self, symbol: str, depth: int = 20) -> Optional[OrderBookSnapshot]:
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"""
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Get current order book snapshot from OKX REST API.
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Args:
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symbol: Trading symbol
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depth: Number of price levels to retrieve
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Returns:
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OrderBookSnapshot: Current order book or None if unavailable
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"""
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try:
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import aiohttp
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okx_symbol = self.normalize_symbol(symbol)
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api_url = "https://www.okx.com"
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# OKX supports depths up to 400
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api_depth = min(depth, 400)
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url = f"{api_url}/api/v5/market/books"
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params = {
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'instId': okx_symbol,
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'sz': api_depth
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}
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async with aiohttp.ClientSession() as session:
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async with session.get(url, params=params) as response:
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if response.status == 200:
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data = await response.json()
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if data.get('code') != '0':
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logger.error(f"OKX API error: {data.get('msg')}")
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return None
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result_data = data.get('data', [])
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if result_data:
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return self._parse_orderbook_snapshot(result_data[0], symbol)
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else:
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return None
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else:
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logger.error(f"Failed to get order book for {symbol}: HTTP {response.status}")
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return None
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except Exception as e:
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logger.error(f"Error getting order book snapshot for {symbol}: {e}")
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return None
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def _parse_orderbook_snapshot(self, data: Dict, symbol: str) -> OrderBookSnapshot:
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"""
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Parse OKX order book data into OrderBookSnapshot.
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Args:
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data: Raw OKX order book data
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symbol: Trading symbol
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||||
Returns:
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OrderBookSnapshot: Parsed order book
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"""
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try:
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# Parse bids and asks
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bids = []
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for bid_data in data.get('bids', []):
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price = float(bid_data[0])
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size = float(bid_data[1])
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if validate_price(price) and validate_volume(size):
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bids.append(PriceLevel(price=price, size=size))
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asks = []
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for ask_data in data.get('asks', []):
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price = float(ask_data[0])
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size = float(ask_data[1])
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if validate_price(price) and validate_volume(size):
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asks.append(PriceLevel(price=price, size=size))
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# Create order book snapshot
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orderbook = OrderBookSnapshot(
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symbol=symbol,
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exchange=self.exchange_name,
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timestamp=datetime.fromtimestamp(int(data.get('ts', 0)) / 1000, tz=timezone.utc),
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bids=bids,
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asks=asks,
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||||
sequence_id=int(data.get('seqId', 0))
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)
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||||
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return orderbook
|
||||
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||||
except Exception as e:
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||||
logger.error(f"Error parsing order book snapshot: {e}")
|
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raise ValidationError(f"Invalid order book data: {e}", "PARSE_ERROR")
|
||||
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||||
async def _handle_orderbook_update(self, data: Dict) -> None:
|
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"""
|
||||
Handle order book update from OKX.
|
||||
|
||||
Args:
|
||||
data: Order book update data
|
||||
"""
|
||||
try:
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||||
set_correlation_id()
|
||||
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# Extract symbol from arg
|
||||
arg = data.get('arg', {})
|
||||
okx_symbol = arg.get('instId', '')
|
||||
if not okx_symbol:
|
||||
logger.warning("Order book update missing instId")
|
||||
return
|
||||
|
||||
symbol = self._denormalize_symbol(okx_symbol)
|
||||
|
||||
# Process each data item
|
||||
for book_data in data.get('data', []):
|
||||
# Parse bids and asks
|
||||
bids = []
|
||||
for bid_data in book_data.get('bids', []):
|
||||
price = float(bid_data[0])
|
||||
size = float(bid_data[1])
|
||||
|
||||
if validate_price(price) and validate_volume(size):
|
||||
bids.append(PriceLevel(price=price, size=size))
|
||||
|
||||
asks = []
|
||||
for ask_data in book_data.get('asks', []):
|
||||
price = float(ask_data[0])
|
||||
size = float(ask_data[1])
|
||||
|
||||
if validate_price(price) and validate_volume(size):
|
||||
asks.append(PriceLevel(price=price, size=size))
|
||||
|
||||
# Create order book snapshot
|
||||
orderbook = OrderBookSnapshot(
|
||||
symbol=symbol,
|
||||
exchange=self.exchange_name,
|
||||
timestamp=datetime.fromtimestamp(int(book_data.get('ts', 0)) / 1000, tz=timezone.utc),
|
||||
bids=bids,
|
||||
asks=asks,
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||||
sequence_id=int(book_data.get('seqId', 0))
|
||||
)
|
||||
|
||||
# Notify callbacks
|
||||
self._notify_data_callbacks(orderbook)
|
||||
|
||||
logger.debug(f"Processed order book update for {symbol}")
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error handling order book update: {e}")
|
||||
|
||||
async def _handle_trade_update(self, data: Dict) -> None:
|
||||
"""
|
||||
Handle trade update from OKX.
|
||||
|
||||
Args:
|
||||
data: Trade update data
|
||||
"""
|
||||
try:
|
||||
set_correlation_id()
|
||||
|
||||
# Extract symbol from arg
|
||||
arg = data.get('arg', {})
|
||||
okx_symbol = arg.get('instId', '')
|
||||
if not okx_symbol:
|
||||
logger.warning("Trade update missing instId")
|
||||
return
|
||||
|
||||
symbol = self._denormalize_symbol(okx_symbol)
|
||||
|
||||
# Process each trade
|
||||
for trade_data in data.get('data', []):
|
||||
price = float(trade_data.get('px', 0))
|
||||
size = float(trade_data.get('sz', 0))
|
||||
|
||||
# Validate data
|
||||
if not validate_price(price) or not validate_volume(size):
|
||||
logger.warning(f"Invalid trade data: price={price}, size={size}")
|
||||
continue
|
||||
|
||||
# Determine side (OKX uses 'side' field)
|
||||
side = trade_data.get('side', 'unknown').lower()
|
||||
|
||||
# Create trade event
|
||||
trade = TradeEvent(
|
||||
symbol=symbol,
|
||||
exchange=self.exchange_name,
|
||||
timestamp=datetime.fromtimestamp(int(trade_data.get('ts', 0)) / 1000, tz=timezone.utc),
|
||||
price=price,
|
||||
size=size,
|
||||
side=side,
|
||||
trade_id=str(trade_data.get('tradeId', ''))
|
||||
)
|
||||
|
||||
# Notify callbacks
|
||||
self._notify_data_callbacks(trade)
|
||||
|
||||
logger.debug(f"Processed trade for {symbol}: {side} {size} @ {price}")
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error handling trade update: {e}")
|
||||
|
||||
async def _handle_subscription_response(self, data: Dict) -> None:
|
||||
"""
|
||||
Handle subscription response from OKX.
|
||||
|
||||
Args:
|
||||
data: Subscription response data
|
||||
"""
|
||||
try:
|
||||
event = data.get('event', '')
|
||||
arg = data.get('arg', {})
|
||||
channel = arg.get('channel', '')
|
||||
inst_id = arg.get('instId', '')
|
||||
|
||||
if event == 'subscribe':
|
||||
logger.info(f"OKX subscription confirmed: {channel} for {inst_id}")
|
||||
elif event == 'unsubscribe':
|
||||
logger.info(f"OKX unsubscription confirmed: {channel} for {inst_id}")
|
||||
elif event == 'error':
|
||||
error_msg = data.get('msg', 'Unknown error')
|
||||
logger.error(f"OKX subscription error: {error_msg}")
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error handling subscription response: {e}")
|
||||
|
||||
async def _handle_error_message(self, data: Dict) -> None:
|
||||
"""
|
||||
Handle error message from OKX.
|
||||
|
||||
Args:
|
||||
data: Error message data
|
||||
"""
|
||||
error_code = data.get('code', 'unknown')
|
||||
error_msg = data.get('msg', 'Unknown error')
|
||||
|
||||
logger.error(f"OKX error {error_code}: {error_msg}")
|
||||
|
||||
# Handle specific error codes
|
||||
if error_code == '60012':
|
||||
logger.error("Invalid request - check parameters")
|
||||
elif error_code == '60013':
|
||||
logger.error("Invalid channel - check channel name")
|
||||
|
||||
def _get_auth_headers(self, timestamp: str, method: str = "GET",
|
||||
request_path: str = "/users/self/verify") -> Dict[str, str]:
|
||||
"""
|
||||
Generate authentication headers for OKX API.
|
||||
|
||||
Args:
|
||||
timestamp: Current timestamp
|
||||
method: HTTP method
|
||||
request_path: Request path
|
||||
|
||||
Returns:
|
||||
Dict: Authentication headers
|
||||
"""
|
||||
if not all([self.api_key, self.api_secret, self.passphrase]):
|
||||
return {}
|
||||
|
||||
try:
|
||||
# Create signature
|
||||
message = timestamp + method + request_path
|
||||
signature = base64.b64encode(
|
||||
hmac.new(
|
||||
self.api_secret.encode('utf-8'),
|
||||
message.encode('utf-8'),
|
||||
hashlib.sha256
|
||||
).digest()
|
||||
).decode('utf-8')
|
||||
|
||||
# Create passphrase signature
|
||||
passphrase_signature = base64.b64encode(
|
||||
hmac.new(
|
||||
self.api_secret.encode('utf-8'),
|
||||
self.passphrase.encode('utf-8'),
|
||||
hashlib.sha256
|
||||
).digest()
|
||||
).decode('utf-8')
|
||||
|
||||
return {
|
||||
'OK-ACCESS-KEY': self.api_key,
|
||||
'OK-ACCESS-SIGN': signature,
|
||||
'OK-ACCESS-TIMESTAMP': timestamp,
|
||||
'OK-ACCESS-PASSPHRASE': passphrase_signature
|
||||
}
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error generating auth headers: {e}")
|
||||
return {}
|
||||
|
||||
async def _send_ping(self) -> None:
|
||||
"""Send ping to keep connection alive."""
|
||||
try:
|
||||
ping_msg = {"op": "ping"}
|
||||
await self._send_message(ping_msg)
|
||||
logger.debug("Sent ping to OKX")
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"Error sending ping: {e}")
|
||||
|
||||
def get_okx_stats(self) -> Dict[str, Any]:
|
||||
"""Get OKX-specific statistics."""
|
||||
base_stats = self.get_stats()
|
||||
|
||||
okx_stats = {
|
||||
'subscribed_channels': list(self.subscribed_channels),
|
||||
'use_demo': self.use_demo,
|
||||
'authenticated': bool(self.api_key and self.api_secret and self.passphrase)
|
||||
}
|
||||
|
||||
base_stats.update(okx_stats)
|
||||
return base_stats
|
||||
Reference in New Issue
Block a user