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Tracking Changes in Raydium Pools: Monitoring External Accounts on Solana

Solana, a popular blockchain platform, provides developers with various features and tools to track and monitor changes to decentralized applications (dApps). One such feature is “onProgramAccountChange,” which allows listeners to detect changes to program accounts, including external accounts. In this article, we will explore how to use “onProgramAccountChange” to track changes in Raydium pools for external accounts.

What is onProgramAccountChange?

“onProgramAccountChange” is an event emitted by the Solana runtime when a program account changes ownership or access control. This event provides listeners with the opportunity to respond to these changes and take action based on the new program account details.

Tracking changes in Raydium pools with onProgramAccountChange

To track changes in Raydium pools for external accounts with onProgramAccountChange, you need to:

• Install the required packages: The solana-program-program-account-change package provides a way to listen for program account changes on Solana.

• Import and initialize the listener: You can create an instance of the ProgramAccountChangeListener class, passing the desired listener function and event type (‘onProgramAccountChange’).

• Listen for changes: Set up a callback function that is called when a change to the program account occurs.

Code example

const { ProgramAccountChangeListener } = require('@solana-program/lib/types');
const { onProgramAccountChange, programProgramAddress } = required('@solana-program/program-program-account-change');
// Import the desired program address for Raydium pools
const raydiumPoolProgramAddress = "Raydium_Pool";
// Configure the listener to detect changes in external accounts
async function listenForChanges(programAccountChange) {
// Define a callback function that is called when a program account change occurs
async function handleProgramAccountChange(event) {
console.log(External account changed: ${event.programId.toString()} -> ${event.newOwner.toString()});
}
//Add the listener to the program address
awaitProgramAccountChange(
programProgramAddress,
raydiumPoolProgramAddress,
handleProgramAccountChange
);
}
// Set up a callback function for initializing the program
async function initializeListener(programAccountChange) {
console.log('Program initialized');
//Add the listener to the program address
awaitProgramAccountChange(
programProgramAddress,
raydiumPoolProgramAddress,
handleProgramAccountChange
);
}
// Initialize listener for changes to external accounts and when the program is initialized
listenForChanges();
initializeListener(programAccountChange);

Tips and Variations

• You can customize the listener function to include additional logic or change its behavior as needed.

• To detect changes to specific types of program accounts (e.g. ExternalProgramAccount), you must define separate callback functions for each account type.

• Test your listeners carefully to make sure they work correctly and produce the expected results.

By following these steps and experimenting with different variations, you can effectively track changes in Raydium pools for external accounts using onProgramAccountChange.

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