Solana: Need help filtering solana transactions from QuickNode streams. Extracting amount of SOL sent and direction of swap
I can guide you thanks to the configuration of a solution to filter and extract specific information from your Solana transactions using Quicknode.
Prerequisite
- You have a QuickNode flow configuration that feeds solana transactions live.
- Your Quicknode configuration allows the streaming of raw payload data data. Otherwise, you will have to implement this feature or use another method to obtain the transaction data.
- You want to extract specific information from each transaction, such as:
– the soil amount sent.
– Management (buy / sell) of the exchange.
Presentation of the solution
To achieve your goal, we will use Quicknode streaming capacities as well as Filter Filter Filter Functions of Solana. We will also use JavaScript for this example, but you can adapt it to other languages if necessary.
Step 1: Configure a basic workflow in Quicknode
First of all, make sure that Quicknode is configured to distribute data from your Solana knot. This generally involves creating a flow earphone and defining it to listen on the subject “Solana” with a range of specific blocks (in this case, the last 100 blocks). You can use libraries like “Quicknode-Stream” or create your own personalized implementation.
Here is a basic example of how you could configure such a listener in JavaScript using QuickNode Streams:
`Javascript
Const {streamlistener} = require ('Quicknode-Streams');
// Create a flow earphone
Const streamlistener = new streamlistener ({
Subject: "Solana",
Startblocknumber: 100, // Start the last 100 blocks
Endblocknumber: Infinity,
});
Streamlistener.on ('block', (block) => {
// do something with the data of each block
console.log (block.data);
});
'
Step 2: Use a library to filter transactions
Now that we have configured our flow earphones, create a function that filters transactions according to the amount of the resolution and the management of the swap. For this example, I will useSolana-Stream-Filterwhich is a popular JavaScript library to filter the Solana transaction data.
First install the required library:
bash
NPM Install Solana-Stream-Filter
'
Then create a new file (for example,Filtertransacts.js) and add the following code:
Javascript
Const {streamfilter} = require ('Solana-Stream-Filter');
// Works to filter transactions according to the soil amount and the management
Filtertransactions asynchronous function (transaction) {
Const Solamount = Transaction.Amount;
Const swapdirection = transaction. Direction;
// Assuming that we have a list of amounts or acceptable directions
if (
! Acceptable for. Including (Solamount) ||
(Swapdirection === 'Buy' && Solamount> AcceptableMOUNTS [0]) ||
(swapdirection === 'Sell' && Solamount
) {
Returns False;
}
True return;
}
// List of acceptable amounts
Const AcceptableMOUNTS = [10, 20]; // replace with your favorite soil amounts
// Create a flow filter
Const filter = new streamfilter ({
transaction,
Filters: {Amount: Acceptable Amounts},
});
// Use the filter in our QuickNode earphones
Streamlistener.on ('block', (block) => {
Const Transactions = Block.Transactions;
For (Constance Const of Transactions) {
If (! Filter. Transaction (Transaction)) {
console.log (filtered out $ {transaction.address}: $ {transaction.amount} – $ {transaction.Direction});
// delete or save the filtered transaction
Filter.remove (transaction);
}
}
});
` ‘
This example assumes that you have a predefined list of amounts and directions acceptable for filtering. You can replace it with your own logic according to your specific needs.
Step 3: Integrate the solution in Quicknode
After implementing the filter step, integrate it into your existing Quicknode configuration.