How can I get the data accounts public key from a accountSubscribe message

Question

How can I determine for which data account the accountSubscribe web-socket message is for if I'm subscribing to multiple data account at ones. The web-socket message doesn't seem to contain the public key of the data account the message is for.

The accountSubscribe method is documented here.

Answer 1

When you make a subscription, the RPC responds with an id that uniquely identifies that particular subscription.

{
  "jsonrpc": "2.0",
  "result": 23784,  // <-- Subscription id
  "id": 1,
}

All notifications for that particular subscription will arrive via the websocket connection carrying that id. Use this to correlate the notification to the original subscription.

{
  "jsonrpc": "2.0",
  "method": "accountNotification",
  "params": {
    "result": { /* ... */ },
    "subscription": 23784  // <-- Subscription id
  }
}

Answer 2

You can subscribe only to one account per RPC client using accountSubscribe. That's why there is no account key.