From facf685285671576eac9f84639049330a207ef75 Mon Sep 17 00:00:00 2001 From: fanquake Date: Tue, 20 Jul 2021 20:39:57 +0800 Subject: [PATCH] Merge bitcoin/bitcoin#22261: [p2p/mempool] Two small fixes to node broadcast logic 5a77abd4e657458852875a07692898982f4b1db5 [style] Clean up BroadcastTransaction() (John Newbery) 7282d4c0363ab5152baa34af626cb49afbfddc32 [test] Allow rebroadcast for same-txid-different-wtxid transactions (glozow) cd48372b67d961fe661990a2c6d3cc3d91478924 [mempool] Allow rebroadcast for same-txid-different-wtxid transactions (John Newbery) 847b6ed48d7bacec9024618922e9b339d2d97676 [test] Test transactions are not re-added to unbroadcast set (Duncan Dean) 2837a9f1eaa2c6bf402d1d9891d9aa84c4a56033 [mempool] Only add a transaction to the unbroadcast set when it's added to the mempool (John Newbery) Pull request description: 1. Only add a transaction to the unbroadcast set when it's added to the mempool Currently, if BroadcastTransaction() is called to rebroadcast a transaction (e.g. by ResendWalletTransactions()), then we add the transaction to the unbroadcast set. That transaction has already been broadcast in the past, so peers are unlikely to request it again, meaning RemoveUnbroadcastTx() won't be called and it won't be removed from m_unbroadcast_txids. Net processing will therefore continue to attempt rebroadcast for the transaction every 10-15 minutes. This will most likely continue until the node connects to a new peer which hasn't yet seen the transaction (or perhaps indefinitely). Fix by only adding the transaction to the broadcast set when it's added to the mempool. 2. Allow rebroadcast for same-txid-different-wtxid transactions There is some slightly unexpected behaviour when: - there is already transaction in the mempool (the "mempool tx") - BroadcastTransaction() is called for a transaction with the same txid as the mempool transaction but a different witness (the "new tx") Prior to this commit, if BroadcastTransaction() is called with relay=true, then it'll call RelayTransaction() using the txid/wtxid of the new tx, not the txid/wtxid of the mempool tx. For wtxid relay peers, in SendMessages(), the wtxid of the new tx will be taken from setInventoryTxToSend, but will then be filtered out from the vector of wtxids to announce, since m_mempool.info() won't find the transaction (the mempool contains the mempool tx, which has a different wtxid from the new tx). Fix this by calling RelayTransaction() with the wtxid of the mempool transaction in this case. The third commit is a comment/whitespace only change to tidy up the BroadcastTransaction() function. ACKs for top commit: duncandean: reACK 5a77abd naumenkogs: ACK 5a77abd4e657458852875a07692898982f4b1db5 theStack: re-ACK 5a77abd4e657458852875a07692898982f4b1db5 lsilva01: re-ACK https://github.com/bitcoin/bitcoin/pull/22261/commits/5a77abd4e657458852875a07692898982f4b1db5 Tree-SHA512: d1a46d32a9f975220e5b432ff6633fac9be01ea41925b4958395b8d641680500dc44476b12d18852e5b674d2d87e4d0160b4483e45d3d149176bdff9f4dc8516 --- src/node/transaction.cpp | 109 +++++++++++++------------ test/functional/mempool_unbroadcast.py | 6 ++ 2 files changed, 65 insertions(+), 50 deletions(-) diff --git a/src/node/transaction.cpp b/src/node/transaction.cpp index 9c039c1a6e..b36af2c1b5 100644 --- a/src/node/transaction.cpp +++ b/src/node/transaction.cpp @@ -31,34 +31,42 @@ static TransactionError HandleATMPError(const TxValidationState& state, std::str TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef tx, bilingual_str& err_string, const CAmount& max_tx_fee, bool relay, bool wait_callback, bool bypass_limits) { - // BroadcastTransaction can be called by either sendrawtransaction RPC or wallet RPCs. - // node.peerman is assigned both before chain clients and before RPC server is accepting calls, - // and reset after chain clients and RPC sever are stopped. node.peerman should never be null here. - assert(node.peerman); + // BroadcastTransaction can be called by either sendrawtransaction RPC or the wallet. + // chainman, mempool and peerman are initialized before the RPC server and wallet are started + // and reset after the RPC sever and wallet are stopped. + assert(node.chainman); assert(node.mempool); + assert(node.peerman); + std::promise promise; - uint256 hashTx = tx->GetHash(); + uint256 txid = tx->GetHash(); bool callback_set = false; - { // cs_main scope - assert(node.chainman); - LOCK(cs_main); - // If the transaction is already confirmed in the chain, don't do anything - // and return early. - CCoinsViewCache &view = node.chainman->ActiveChainstate().CoinsTip(); - for (size_t o = 0; o < tx->vout.size(); o++) { - const Coin& existingCoin = view.AccessCoin(COutPoint(hashTx, o)); - // IsSpent does not mean the coin is spent, it means the output does not exist. - // So if the output does exist, then this transaction exists in the chain. - if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_CHAIN; - } - if (!node.mempool->exists(hashTx)) { - // Transaction is not already in the mempool. - if (max_tx_fee > 0) { - // First, call ATMP with test_accept and check the fee. If ATMP - // fails here, return error immediately. - const MempoolAcceptResult result = AcceptToMemoryPool(node.chainman->ActiveChainstate(), *node.mempool, tx, - bypass_limits, true /* test_accept */); + { + LOCK(cs_main); + + // If the transaction is already confirmed in the chain, don't do anything + // and return early. + CCoinsViewCache &view = node.chainman->ActiveChainstate().CoinsTip(); + for (size_t o = 0; o < tx->vout.size(); o++) { + const Coin& existingCoin = view.AccessCoin(COutPoint(txid, o)); + // IsSpent does not mean the coin is spent, it means the output does not exist. + // So if the output does exist, then this transaction exists in the chain. + if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_CHAIN; + } + if (auto mempool_tx = node.mempool->get(txid); mempool_tx) { + // There's already a transaction in the mempool with this txid. Don't + // try to submit this transaction to the mempool (since it'll be + // rejected as a TX_CONFLICT), but do attempt to reannounce the mempool + // transaction if relay=true. + // + } else { + // Transaction is not already in the mempool. + if (max_tx_fee > 0) { + // First, call ATMP with test_accept and check the fee. If ATMP + // fails here, return error immediately. + const MempoolAcceptResult result = AcceptToMemoryPool(node.chainman->ActiveChainstate(), *node.mempool, tx, + bypass_limits, true /* test_accept */); if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) { return HandleATMPError(result.m_state, err_string.original); } else if (result.m_base_fees.value() > max_tx_fee) { @@ -68,28 +76,33 @@ TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef t // Try to submit the transaction to the mempool. const MempoolAcceptResult result = AcceptToMemoryPool(node.chainman->ActiveChainstate(), *node.mempool, tx, bypass_limits, false /* test_accept */); - if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) { - return HandleATMPError(result.m_state, err_string.original); + if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) { + return HandleATMPError(result.m_state, err_string.original); + } + + // Transaction was accepted to the mempool. + + if (relay) { + // the mempool tracks locally submitted transactions to make a + // best-effort of initial broadcast + node.mempool->AddUnbroadcastTx(txid); + } + + if (wait_callback) { + // For transactions broadcast from outside the wallet, make sure + // that the wallet has been notified of the transaction before + // continuing. + // + // This prevents a race where a user might call sendrawtransaction + // with a transaction to/from their wallet, immediately call some + // wallet RPC, and get a stale result because callbacks have not + // yet been processed. + CallFunctionInValidationInterfaceQueue([&promise] { + promise.set_value(); + }); + callback_set = true; + } } - - // Transaction was accepted to the mempool. - - if (wait_callback) { - // For transactions broadcast from outside the wallet, make sure - // that the wallet has been notified of the transaction before - // continuing. - // - // This prevents a race where a user might call sendrawtransaction - // with a transaction to/from their wallet, immediately call some - // wallet RPC, and get a stale result because callbacks have not - // yet been processed. - CallFunctionInValidationInterfaceQueue([&promise] { - promise.set_value(); - }); - callback_set = true; - } - } - } // cs_main if (callback_set) { @@ -99,12 +112,8 @@ TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef t } if (relay) { - // the mempool tracks locally submitted transactions to make a - // best-effort of initial broadcast - node.mempool->AddUnbroadcastTx(hashTx); - LOCK(cs_main); - node.peerman->RelayTransaction(hashTx); + node.peerman->RelayTransaction(txid); } return TransactionError::OK; diff --git a/test/functional/mempool_unbroadcast.py b/test/functional/mempool_unbroadcast.py index b475b65e68..7d9e6c306d 100755 --- a/test/functional/mempool_unbroadcast.py +++ b/test/functional/mempool_unbroadcast.py @@ -92,6 +92,12 @@ class MempoolUnbroadcastTest(BitcoinTestFramework): self.disconnect_nodes(0, 1) node.disconnect_p2ps() + self.log.info("Rebroadcast transaction and ensure it is not added to unbroadcast set when already in mempool") + rpc_tx_hsh = node.sendrawtransaction(txFS["hex"]) + mempool = node.getrawmempool(True) + assert rpc_tx_hsh in mempool + assert not mempool[rpc_tx_hsh]['unbroadcast'] + def test_txn_removal(self): self.log.info("Test that transactions removed from mempool are removed from unbroadcast set") node = self.nodes[0]