Adds 'should reject and refund a pegout when fee per kb is above valu…

lib/constants.js

@@ -117,6 +117,13 @@ const PEGIN_V1_RSKT_PREFIX_HEX =  '52534b54';
 const MINIMUM_PEGOUT_AMOUNT_IN_SATOSHIS = 250_000;
 const DEFAULT_RSK_ADDRESS_FUNDING_IN_BTC = 0.5;
 
+const FEE_PER_KB_CHANGER_PRIVATE_KEY = '6a4b49312b91e203ddfb9bc2d900ebbd46fbede46a7462e770bedcb11ad405e9';
+const FEE_PER_KB_CHANGER_ADDRESS = '53f8f6dabd612b6137215ddd7758bb5cdd638922';
+
+const FEE_PER_KB_RESPONSE_CODES = {
+  SUCCESSFUL_VOTE: 1,
+};
+
 module.exports = {
   KEY_TYPE_BTC,
   KEY_TYPE_RSK,
@@ -143,4 +150,7 @@ module.exports = {
   MINIMUM_PEGOUT_AMOUNT_IN_SATOSHIS,
   DEFAULT_RSK_ADDRESS_FUNDING_IN_BTC,
   PEGOUT_REJECTION_REASONS,
+  FEE_PER_KB_CHANGER_PRIVATE_KEY,
+  FEE_PER_KB_CHANGER_ADDRESS,
+  FEE_PER_KB_RESPONSE_CODES,
 };

lib/rsk-utils.js

@@ -6,7 +6,12 @@ const { getRskTransactionHelpers } = require('../lib/rsk-tx-helper-provider');
 const { wait, retryWithCheck, removePrefix0x } = require('./utils');
 const { waitForBitcoinMempoolToGetTxs } = require('./btc-utils');
 const { getLogger } = require('../logger');
-const { PEGOUT_EVENTS } = require('./constants');
+const {
+  PEGOUT_EVENTS,
+  FEE_PER_KB_CHANGER_PRIVATE_KEY,
+  FEE_PER_KB_CHANGER_ADDRESS,
+  FEE_PER_KB_RESPONSE_CODES,
+} = require('./constants');
 const BtcTransactionHelper = require('btc-transaction-helper/btc-transaction-helper');
 
 const BTC_TO_RSK_MINIMUM_ACCEPTABLE_CONFIRMATIONS = 3;
@@ -502,7 +507,27 @@ const getFedsPubKeys = async (bridge) => {
     FEDS_PUBKEYS_LIST.push(removePrefix0x(fedPubKey));
   }
   return FEDS_PUBKEYS_LIST;
-}
+};
+
+/**
+ * Calls `Bridge::voteFeePerKbChange` to set a new fee per kb.
+ * @param {RskTransactionHelper} rskTxHelper 
+ * @param {number} feePerKbInSatoshis the value to be set as the new fee per kb
+ */
+const setFeePerKb = async (rskTxHelper, feePerKbInSatoshis) => {
+
+  await rskTxHelper.getClient().eth.personal.importRawKey(FEE_PER_KB_CHANGER_PRIVATE_KEY, '');
+  await rskTxHelper.getClient().eth.personal.unlockAccount(FEE_PER_KB_CHANGER_ADDRESS, '');
+  const bridge = getBridge(rskTxHelper.getClient());
+
+  await sendTxWithCheck(rskTxHelper, bridge.methods.voteFeePerKbChange(feePerKbInSatoshis), FEE_PER_KB_CHANGER_ADDRESS, (result) => {
+    expect(Number(result)).to.equal(FEE_PER_KB_RESPONSE_CODES.SUCCESSFUL_VOTE);
+  });
+
+  const finalFeePerKb = await bridge.methods.getFeePerKb().call();
+  expect(Number(finalFeePerKb)).to.equal(Number(feePerKbInSatoshis));
+
+};
 
 module.exports = {
   mineAndSync,
@@ -522,4 +547,5 @@ module.exports = {
   waitAndUpdateBridge,
   sendTransaction,
   getPegoutEventsInBlockRange,
+  setFeePerKb,
 };

lib/tests/2wp.js

@@ -5,7 +5,7 @@ const { getBridge } = require('../precompiled-abi-forks-util');
 const { getBtcClient } = require('../btc-client-provider');
 const { getRskTransactionHelper, getRskTransactionHelpers } = require('../rsk-tx-helper-provider');
 const { satoshisToBtc, btcToSatoshis, satoshisToWeis } = require('@rsksmart/btc-eth-unit-converter');
-const { findEventInBlock, triggerRelease, getPegoutEventsInBlockRange } = require('../rsk-utils');
+const { findEventInBlock, triggerRelease, getPegoutEventsInBlockRange, setFeePerKb } = require('../rsk-utils');
 const {
   PEGIN_REJECTION_REASONS,
   PEGIN_UNREFUNDABLE_REASONS,
@@ -774,6 +774,51 @@ const execute = (description, getRskHost) => {
 
     });
 
+    it('should reject and refund a pegout when fee per kb is above value', async () => {
+
+      // Arrange
+
+      // Create a pegin for the sender to ensure there is enough funds to pegout and because this is the natural process
+      const senderRecipientInfo = await createSenderRecipientInfo(rskTxHelper, btcTxHelper);
+      await fundRskAccountThroughAPegin(rskTxHelper, btcTxHelper, senderRecipientInfo.btcSenderAddressInfo);
+
+      const initial2wpBalances = await get2wpBalances(rskTxHelper, btcTxHelper);
+      const initialBtcRecipientAddressBalanceInSatoshis = await getBtcAddressBalanceInSatoshis(btcTxHelper, senderRecipientInfo.btcSenderAddressInfo.address);
+      const initialRskSenderBalanceInWeisBN = await rskTxHelper.getBalance(senderRecipientInfo.rskRecipientRskAddressInfo.address);
+      const pegoutValueInSatoshis = MINIMUM_PEGOUT_AMOUNT_IN_SATOSHIS - 1;
+
+      const initialFeePerKb = Number(await bridge.methods.getFeePerKb().call());
+      // We just need to have a feePerKB that will cause the pegout to rejected due to FEE_ABOVE_VALUE reason.
+      // This value is way bigger than what we need, but actual calculation is complex and and estimation so we cannot know for sure.
+      // That's we we just use a big enough value. The MINIMUM_PEGOUT_AMOUNT_IN_SATOSHIS is perfect for this in this case.
+      const newFeePerKbInSatoshis = MINIMUM_PEGOUT_AMOUNT_IN_SATOSHIS;
+      await setFeePerKb(rskTxHelper, newFeePerKbInSatoshis);
+
+      // Act
+
+      const pegoutTransaction = await sendTxToBridge(rskTxHelper, new BN(satoshisToWeis(pegoutValueInSatoshis)), senderRecipientInfo.rskRecipientRskAddressInfo.address);
+
+      // Assert
+
+      await assertExpectedReleaseRequestRejectedEventIsEmitted(senderRecipientInfo.rskRecipientRskAddressInfo.address, pegoutValueInSatoshis, PEGOUT_REJECTION_REASONS.FEE_ABOVE_VALUE);
+
+      await assert2wpBalanceIsUnchanged(initial2wpBalances);
+
+      // The rsk sender balance is the same as the initial balance minus the gas fee, because the pegout amount was refunded.
+      const finalRskSenderBalanceInWeisBN = await rskTxHelper.getBalance(senderRecipientInfo.rskRecipientRskAddressInfo.address);
+      const gasFee = pegoutTransaction.gasUsed * pegoutTransaction.effectiveGasPrice;
+      const expectedRskSenderBalanceInWeisBN = initialRskSenderBalanceInWeisBN.sub(new BN(`${gasFee}`));
+      expect(finalRskSenderBalanceInWeisBN.eq(expectedRskSenderBalanceInWeisBN)).to.be.true;
+
+      // The btc recipient address balance is the same as the initial balance, because the pegout didn't go though.
+      const finalBtcRecipientBalanceInSatoshis = await getBtcAddressBalanceInSatoshis(btcTxHelper, senderRecipientInfo.btcSenderAddressInfo.address);
+      expect(finalBtcRecipientBalanceInSatoshis).to.be.equal(initialBtcRecipientAddressBalanceInSatoshis);
+
+      // Setting fee per kb back to its original value
+      await setFeePerKb(rskTxHelper, initialFeePerKb);
+
+    });
+
   });
 
 };
@@ -940,4 +985,3 @@ const assertExpectedReleaseRequestRejectedEventIsEmitted = async (rskSenderAddre
 module.exports = {
   execute,
 };
-