Determining how much data is currently in receive buffer

I'm using the ws library on Node for my server. The browser sends a large amount of data to the server over the websocket. I'm finding that it's sometimes too fast and node is running out of memory, I'm assuming because the receive buffer is filling up. I'm trying to find a way to detect how much data is currently in node's receive buffer, so I can implement basic flow control. I'd prefer not to use a solution like websocket-stream, because I'm already multiplexing my control packets and multiple data streams over a single websocket, and I'd prefer not to re-architect the entire system to support multiple separate websocket connections. Also I'd prefer not to be constantly opening and closing websockets.

ws

You can see the source here including a README which describes what the thing does.

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