orderbook | Orderbook implementation in go with red black tree

I am trying to access the live price of a crypto currency coin from an exchange webpage through python.

The XPath of the value I want is in /html/body/luno-exchange-app/luno-navigation/div/luno-market/div/section[2]/luno-orderbook/div/luno-spread/div/luno-orderbook-entry[2]/div/span/span and I have been doing the following

I'm following instructions (here) to mirror multiple orderbooks on Binance Exchange on my local machine.

Suppose for simplicity, I wish to mirror orderbooks for 2 symbols: ETHBTC and DOGEBTC (in reality it's 350+).

First I have to buffer the websocket order-update streams:

• wss://stream.binance.com:9443/stream?streams=ETHBTC@depth@100ms
• wss://stream.binance.com:9443/stream?streams=DOGEBTC@depth@100ms

Now I have to download snapshots:

• https://api.binance.com/api/v3/depth?symbol=ETHBTC&limit=1000
• https://api.binance.com/api/v3/depth?symbol=DOGEBTC&limit=1000

As soon as I have the snapshots, I apply the buffer (which is ongoing) to them, yielding a STATE.

After that, all order-updates can simply be applied to the state.

For the updates stream I can do:

I'm following instructions here.

Effectively the problem boils down to this:

I'm trying to calculate a few metrics around an orderbook, and looking for how deep I need to go in to fill an order of $x. I have created a list of lists that shows the price and cumulative asks, and then am finding how deep I need to go under cumulative asks >= x. However, depending on the orderbook and x, sometimes I don't have enough data and end up with a list index out of range error. How can I set some sort of default, None, N/A, whatever, when this is the case.

Note: I feel like there may be a better way than creating a list with the >= and then filtering for first elements of that list, so if that makes solving the index out of range error easier, that'd be great, too.

i have a layout that shows all the orders placed in which i have record of paid and remaining amount also , so i am trying to display the background color of rows as red if remaining field data is more than 0 for this i am trying this method

This is what I tried

The file that I'm running, example_market_data.py,

I am trying to make an order book widget. I am imitating this example on codesandbox where it has a span in td with position: relative and a percent div with its 'positionset toabsolute` and then it dynamically setting the width accordingly.

the code is like this

I have a order book component that is getting data from this websocket endpoint "wss://ws.bitstamp.net"

The subscription is fired inside useEffect