machankura/mempool
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Improve prioritized transaction detection algorithm

Browse Source
This commit is contained in:
Mononaut
2024-08-17 00:14:33 +00:00
parent db10ab9aae
commit 248cef7718
8 changed files with 201 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
backend/src/api/audit.ts
View File

@@ -2,6 +2,7 @@ import config from '../config';
import logger from '../logger';
import { MempoolTransactionExtended, MempoolBlockWithTransactions } from '../mempool.interfaces';
import rbfCache from './rbf-cache';
import transactionUtils from './transaction-utils';
const PROPAGATION_MARGIN = 180; // in seconds, time since a transaction is first seen after which it is assumed to have propagated to all miners
@@ -15,7 +16,8 @@ class Audit {
const matches: string[] = []; // present in both mined block and template
const added: string[] = []; // present in mined block, not in template
const unseen: string[] = []; // present in the mined block, not in our mempool
const prioritized: string[] = []; // higher in the block than would be expected by in-band feerate alone
let prioritized: string[] = []; // higher in the block than would be expected by in-band feerate alone
let deprioritized: string[] = []; // lower in the block than would be expected by in-band feerate alone
const fresh: string[] = []; // missing, but firstSeen or lastBoosted within PROPAGATION_MARGIN
const rbf: string[] = []; // either missing or present, and either part of a full-rbf replacement, or a conflict with the mined block
const accelerated: string[] = []; // prioritized by the mempool accelerator
@@ -133,23 +135,7 @@ class Audit {
totalWeight += tx.weight;
}
// identify "prioritized" transactions
let lastEffectiveRate = 0;
// Iterate over the mined template from bottom to top (excluding the coinbase)
// Transactions should appear in ascending order of mining priority.
for (let i = transactions.length - 1; i > 0; i--) {
const blockTx = transactions[i];
// If a tx has a lower in-band effective fee rate than the previous tx,
// it must have been prioritized out-of-band (in order to have a higher mining priority)
// so exclude from the analysis.
if ((blockTx.effectiveFeePerVsize || 0) < lastEffectiveRate) {
prioritized.push(blockTx.txid);
// accelerated txs may or may not have their prioritized fee rate applied, so don't use them as a reference
} else if (!isAccelerated[blockTx.txid]) {
lastEffectiveRate = blockTx.effectiveFeePerVsize || 0;
}
}
({ prioritized, deprioritized } = transactionUtils.identifyPrioritizedTransactions(transactions, 'effectiveFeePerVsize'));
// transactions missing from near the end of our template are probably not being censored
let overflowWeightRemaining = overflowWeight - (config.MEMPOOL.BLOCK_WEIGHT_UNITS - totalWeight);