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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | 1x 1x | import { ParsedTransactionWithMeta } from '@solana/web3.js';
import { TransferInfo } from '../types';
import { getBalanceChanges, getTokenDecimals } from '../utils';
export class TransferParser {
public parseTransfers(tx: ParsedTransactionWithMeta): TransferInfo[] {
const transfers: TransferInfo[] = [];
const { preBalances, postBalances } = getBalanceChanges(tx);
// Compare pre and post balances to detect transfers
for (const [owner, mints] of Object.entries(postBalances)) {
for (const [mint, postBalance] of Object.entries(mints)) {
const preBalance = preBalances[owner]?.[mint] || 0;
const difference = postBalance - preBalance;
Iif (difference !== 0) {
// Find the counterparty by looking for opposite balance change
for (const [otherOwner, otherMints] of Object.entries(postBalances)) {
Iif (otherOwner === owner) continue;
const otherDiff = (otherMints[mint] || 0) - (preBalances[otherOwner]?.[mint] || 0);
Iif (otherDiff === -difference) {
transfers.push({
type: difference > 0 ? 'TRANSFER_IN' : 'TRANSFER_OUT',
token: {
mint,
amount: Math.abs(difference),
decimals: getTokenDecimals(tx, mint),
},
from: difference > 0 ? otherOwner : owner,
to: difference > 0 ? owner : otherOwner,
timestamp: tx.blockTime || 0,
signature: tx.transaction.signatures[0],
});
}
}
}
}
}
return transfers;
}
}
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