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Fix CPFP when tx fee is less than MIN_RELAY #694

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Fix CPFP when tx fee is less than MIN_RELAY #694

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ec53743
Fix CPFP when tx fee is less than MIN_RELAY
Anunayj Feb 28, 2022
28b1486
test: Child pays for parent
Anunayj Feb 28, 2022
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2 changes: 1 addition & 1 deletion lib/mining/template.js
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Original file line number Diff line number Diff line change
Expand Up @@ -654,7 +654,7 @@ class BlockEntry {
item.fee = entry.getFee();
item.rate = entry.getDeltaRate();
item.priority = entry.getPriority(attempt.height);
item.free = entry.getDeltaFee() < policy.getMinFee(entry.size);
item.free = entry.descFee < policy.getMinFee(entry.descSize);
item.sigops = entry.sigops;
item.descRate = entry.getDescRate();
return item;
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80 changes: 79 additions & 1 deletion test/miner-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ const Mempool = require('../lib/mempool/mempool');
const Miner = require('../lib/mining/miner');
const Address = require('../lib/primitives/address');
const MTX = require('../lib/primitives/mtx');
const Coin = require('../lib/primitives/coin');
const MemWallet = require('./util/memwallet');
const {BufferSet} = require('buffer-map');

Expand Down Expand Up @@ -77,6 +78,7 @@ describe('Miner', function() {

let walletAddr;
const txids = new BufferSet();
let coin, parentTX;

it('should generate 20 blocks to wallet address', async () => {
walletAddr = wallet.createReceive().getAddress();
Expand Down Expand Up @@ -110,7 +112,6 @@ describe('Miner', function() {
}

assert.strictEqual(mempool.map.size, 10);

const block = await miner.mineBlock(chain.tip, addr);
await chain.add(block);

Expand Down Expand Up @@ -180,4 +181,81 @@ describe('Miner', function() {
assert(txids.has(block.txs[i].hash()));
}
});

it('should not include free transaction in a block', async () => {
// Miner does not have any room for free TXs
miner.options.minWeight = 0;

const value = 1 * 1e6;
const fee = 0;

// Get a change address
const change = wallet.createChange().getAddress();
const mtx = new MTX();
coin = wallet.getCoins()[0];
mtx.addCoin(coin);
mtx.addOutput(addr, value);
mtx.addOutput(change, coin.value - value - fee); // no fee
wallet.sign(mtx);
parentTX = mtx.toTX();

await mempool.addTX(parentTX, -1);
assert.strictEqual(mempool.map.size, 1);

const block = await miner.mineBlock(chain.tip, addr);
await chain.add(block);

// TX is still in mempool, nothing in block except coinbase
assert.strictEqual(mempool.map.size, 1);
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I think this test block should begin either with a mempool.reset() or assertion that mempool is empty. What might be even better is starting a new describe block called CPFP or something. Especially since the "should not include free transaction in a block" test is basically a duplicate. We know we can't include free TXs in blocks from L127-L165.

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yea I think a separate describe block is better, since this itself got way too long for just miner test. or maybe a complete different test file for CPFP and in future RBF (and other fee bumping mechanisms) might be better.

assert.strictEqual(block.txs.length, 1);
});

it('should fail to double spend the coin - duplicate tx in mempool', async () => {
const value = 1 * 1e6;
const fee = 1000;
const mtx = new MTX();

const change = wallet.createChange().getAddress();
mtx.addCoin(coin);
mtx.addOutput(addr, value);
mtx.addOutput(change, coin.value - value - fee);
wallet.sign(mtx);
const tx = mtx.toTX();

assert.rejects(
async () => await mempool.addTX(tx, -1),
{
code: 'duplicate',
reason: 'bad-txns-inputs-spent'
}
);
// orignal tx is still in mempool
assert.strictEqual(mempool.map.size, 1);
});
Comment on lines +213 to +234
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This looks more like a mempool test than a miner test. Do we need to add it? Is this error already covered in the mempool tests?


it('should include child transaction if child pays enough fee (CPFP)', async () => {
const fee = 1000;

// Fee should be enough for both the first transation and second transaction
assert(fee > 140 + 108);
Comment on lines +239 to +240
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Where did you get these values from (140 and 108)? It might be more clear to see the values pulled from the MempoolEntry itself is possible. In addition, asserting that the descSize and descFee of the parent TX is being updated when child is added to mempool and that the value is correct.

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@Anunayj Anunayj Mar 11, 2022 •
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Oh yea, I'll fix that, sorry mb there, I was supposed to replace that with calculation for fee for both transactions, that was just supposed to be a placeholder


const mtx = new MTX();
const change = wallet.createChange().getAddress();
const coin = Coin.fromTX(parentTX, 1, -1);

mtx.addCoin(coin);
mtx.addOutput(change, coin.value - fee);
wallet.sign(mtx);
const tx = mtx.toTX();
await mempool.addTX(tx, -1);
// Both transactions in mempool
assert.strictEqual(mempool.map.size, 2);

const block = await miner.mineBlock(chain.tip, addr);
await chain.add(block);

// Both transactions should get mined into the block
assert.strictEqual(mempool.map.size, 0);
assert.strictEqual(block.txs.length, 3);
});
});