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Optimizing Solana Transaction History Scanning with a Multi-machine Architecture
As a developer building a service that monitors and manages Solana transactions, I faced a challenge with my multi-machine architecture. By default, both instances process logs in isolation, which can lead to inconsistencies in data collection and potentially missed transactions.
The Problem: Lack of Data Consistency
If one instance is down, it will still receive new transaction logs, but the other instance will not have access to them. This can cause problems if you rely on the same batch of transactions for processing or validation.
To solve this problem, I turned to Solana’s built-in logging mechanism and implemented a simple solution to examine the transaction history block by block:
Reading Transaction History Block by Block
Here’s an overview of my approach:
- Set Up Logging
: Configure both instances with the same logger to record logs.
- Create a Transaction Checker Function: Write a separate function that listens for Solana transactions and updates our database or in-memory data structure accordingly.
This is where things get interesting – we can now examine the transaction history block by block without collisions:
const transactions = {}; // Initialize an empty object to store all transactions
const logger = ...; // Set up the logger instance
async function logTransaction(transaction) {
try {
const transactionHash = transaction.hash;
if (!transactions[transactionHash]) {
transactions[transactionHash] = {};
}
for (const key in transactions[transactionHash]) {
transactions[transactionHash][key].push(transaction);
}
} catch (error) {
logger.error('Error processing transaction:', error);
}
}
async function scanTransactionHistoryByBlock(blockNumber) {
const blockInfo = await getBlockInfo(blockNumber);
const transactionsInThisBlock = [];
for (const input blockInfo.transactions) {
if (entry.type === 'transaction') {
logTransaction(entry);
}
// Add any other relevant data from the transaction to our database
}
}
Example use case
Here is an example of how we can use this function to examine the transaction history based on a given block number:
const blockchain = ...; // Assume we have access to the blockchain instance
async function main() {
const blocknumber = 12345;
await scanTransactionHistoryByBlock(blockNumber);
}
This approach ensures that our service remains consistent even if an instance is down, providing a reliable way to process and validate transactions on Solana.