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Ethereum: Binance SpotWebsocketClient Not Sending Responses for a Subscribed Symbol
As a cryptocurrency trader, getting real-time updates from a reliable source is crucial to making informed decisions. One such source is the Binance Spot WebSocket API, which provides a way to connect to the Ethereum blockchain and receive market data in real-time. However, when using the BinanceSpotWebsocketClient library, there’s an issue that can prevent it from sending responses for subscribed symbols.
The Issue: Subscription Unsubscribed
In your code snippet, you’re creating a new instance of the SpotWebsocketClient class and passing in the subscription details. However, when you subscribe to a specific symbol using the subscribe method, you might not be explicitly unsubscribing from it afterwards. If this happens, the client will continue to send data for that subscribed symbol even after you’ve removed yourself from the list.
The Solution: Using unsubscribe Method
To resolve this issue, you should always call the unsubscribe method when unsubscribing from a subscription. Here’s an updated version of your code with this fix:
import json
import datetime
from binance.websocket.spot.websocket_client import SpotWebsocketClient
def safe_json_load(data):
return data
def safe_json_dump(data):
return json.dumps(data)
class BinanceSpotWebsocketClient:
def __init__(self, symbol, secretKey, apiEndpoint):
self.symbol = symbol
self.secretKey = secretKey
self.apiEndpoint = apiEndpoint
self.subscriptions = {}
def subscribe(self, symbol, callback=None):
if symbol not in self.subscriptions:
self.subscriptions[symbol] = None
response = safe_json_load(callback)
if response is None:
raise ValueError("Invalid subscription")
self._subscribe(symbol, response)
def unsubscribe(self, symbol):
if symbol not in self.subscriptions:
return
del self.subscriptions[symbol]
Call the callback function to trigger an unsubscribed event
if symbol in self.callbackFunctions:
self.callbackFunctions[symbol]()
def _subscribe(self, symbol, data):
This method is called when a subscription is created
print(f"Subscribed to {symbol} for real-time updates")
def sendRealtimeData(self, symbol):
This method can be used to retrieve real-time data for a specific symbol
pass
Usage example:
client = BinanceSpotWebsocketClient(
"ETH",
Symbol
"YOUR_SECRET_KEY",
Secret key
"
API endpoint
)
def onRealtimeDataReceived(data):
print(f"{data['symbol']} updated to {data['newPrice']}")
client.subscribe("ETH", onRealtimeDataReceived)
Testing the Code
You can test this code by running it in a Jupyter Notebook. Make sure you have installed binance library and also make sure that you have replaced "YOUR_SECRET_KEY" with your actual Binance secret key.
Once you’ve created an instance of the BinanceSpotWebsocketClient, you can subscribe to a specific symbol using the subscribe method, which will trigger real-time data updates for that symbol. You can then unsubscribe from a subscription by calling the unsubscribe method when you’re ready to stop receiving updates.
By following these steps, you should be able to resolve the issue with your code and ensure that it’s sending responses for subscribed symbols.