orderbook | Efficient implementation of an exchange orderbook | Cryptocurrency library

Sorry I cannot give all the code. Basically, I am retrieving the OrderBook of a few hundred cryptocurrencies every second. Every time I retrieve it I need to add it into an excel readable file for another department. Every excel will save all the data in one day. The retrieved order book record will be something that looks like this.

time | exchange | price | quantity | side

unit time| BINANCE | 1.00 | 90925 | ask

I have tried pd.excelwriter append, read_csv combine write_csv and appending to pre-saved pandaframe.

However, all these options are too slow to get under 1 second even I boosted the code with cython. Websocket with thread only takes 0.2s to retrieve the data so we have 0.8s to append. Something is fixed: Python should be the language, my co-worker only knows python, the saving format must be any file extension that excel can read as the other department doesn't know coding.

Can someone help me with some ideas? I can do the implementation myself. Just want some idea.

I'm trying to parse a JSON blob that looks like this:

I'm trying to wrap an API using rust, so long no problems but one endpoint is giving me a big pain in the head.

the endpoint returns a valid JSON as the other endpoints from this API.

The problem is when I try to work with the response I get the following error:

Forgive me if this is an obvious fix as I am very much a novice when it comes to C++.

For my assignment, we were given some starter code that simulates a command-line crypto trading platform. Originally, you would be prompted to type in commands 1 to 6 to do things like print exchange stats, make an offer, print the wallet and such. For my assignment, I've been asked to create an advisor bot that takes in string commands such as 'help' and processes this to return the appropriate output.

Naturally, since there was already a system in place to do this with integers as inputs, I tried to tweak the functions (I didn't do a lot yet) so they take string commands instead and output accordingly.

Before anything else, I would like to know why the function getUserOption and input is underlined red in the while loop of the init function, but in the actual function there are no errors:

This is the contents of the header file

Im using a mutation observer to observe the changes that happen to an

element. when observing, i get the following output:
...

I have an app getting data from a websocket connection that is really fast and is causing errors with the data in state. I'm. passing an array of just 15 items into a child component, however it is an array of tuples. When I map it, I need to deconstruct each tuple to render each item. However, every 30 seconds or so the component is receiving data that is corrupted and causing the erorr:

TypeError: Cannot read properties of undefined (reading '0')

At the line item[0] because item is undefined. I have tried several types of logic to make this mapping conditional based on the contents of the property. Below is Array.isArray(topAsks[0]), i have also tried topAsks.length > 2. However it is still going past and trying to map the undefined array.

Is there a better way to do this? That is being able to check that it is not undefined before mapping?

Also above commented out I was thinking of doing this with a for loop and then mapping each single array (bypassing the need to access an inner array), seems weird, but perhaps that is an effective way of doing this?

I'm looking for a solution for a performance optimisation I'm trying to get in place for some code I've got consuming a financial market orderbook, basically the JSON object I'm getting back has an array type property containing hundreds/thousands of order objects however I'm only interested in the top 10 to 20 of these (needs to be dynamically determined). From a performance perspective I'd prefer to just skip deserializing & adding every item in the array after I've added the ones I need. To clarify it's always the FIRST 10 to 20 items in the array I actually need, everything after this can be excluded.

Is there any way to achieve this in Json.NET? I've been looking at JsonConverters but can't figure it out.

My main issue might be not understanding some conventions in the Camel documents.

https://camel.apache.org/components/latest/mongodb-component.html#_delete_operations

They have a camel route commented out, and two Java objects being defined, which are not commented out. What are they trying to indicate? Where are these objects at in a project?

Anyway, I'm subscribed to a JMS queue that I have another camel route publishing to. The message is a JSON string, which I save to a Mongo DB. But what I'd like to do is remove any current documents (based on criteria) and replace it with the new message.

The cryptofeed is a python library that uses asyncio library to get real-time prices of different Crypto Exchanges. In this short program, we try to run the cryptofeed FeedHandler in an independent thread. An example of the code is shown below: