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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <consensus/validation.h>
#include <index/txindex.h>
#include <net.h>
#include <net_processing.h>
#include <node/blockstorage.h>
#include <node/context.h>
#include <node/types.h>
#include <txmempool.h>
#include <validation.h>
#include <validationinterface.h>
#include <node/transaction.h>
#include <future>
namespace node {
static TransactionError HandleATMPError(const TxValidationState& state, std::string& err_string_out)
{
err_string_out = state.ToString();
if (state.IsInvalid()) {
if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS) {
return TransactionError::MISSING_INPUTS;
}
return TransactionError::MEMPOOL_REJECTED;
} else {
return TransactionError::MEMPOOL_ERROR;
}
}
TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef tx, std::string& err_string, const CAmount& max_tx_fee, bool relay, bool wait_callback)
{
// BroadcastTransaction can be called by RPC or by 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<void> promise;
Txid txid = tx->GetHash();
Wtxid wtxid = tx->GetWitnessHash();
bool callback_set = false;
{
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 doesn't mean the coin is spent, it means the output doesn't exist.
// So if the output does exist, then this transaction exists in the chain.
if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_UTXO_SET;
}
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.
//
// The mempool transaction may have the same or different witness (and
// wtxid) as this transaction. Use the mempool's wtxid for reannouncement.
wtxid = mempool_tx->GetWitnessHash();
} 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 = node.chainman->ProcessTransaction(tx, /*test_accept=*/ true);
if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
return HandleATMPError(result.m_state, err_string);
} else if (result.m_base_fees.value() > max_tx_fee) {
return TransactionError::MAX_FEE_EXCEEDED;
}
}
// Try to submit the transaction to the mempool.
const MempoolAcceptResult result = node.chainman->ProcessTransaction(tx, /*test_accept=*/ false);
if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
return HandleATMPError(result.m_state, err_string);
}
// 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 && node.validation_signals) {
// 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.
node.validation_signals->CallFunctionInValidationInterfaceQueue([&promise] {
promise.set_value();
});
callback_set = true;
}
}
} // cs_main
if (callback_set) {
// Wait until Validation Interface clients have been notified of the
// transaction entering the mempool.
promise.get_future().wait();
}
if (relay) {
node.peerman->RelayTransaction(txid, wtxid);
}
return TransactionError::OK;
}
CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const uint256& hash, uint256& hashBlock, const BlockManager& blockman)
{
if (mempool && !block_index) {
CTransactionRef ptx = mempool->get(hash);
if (ptx) return ptx;
}
if (g_txindex) {
CTransactionRef tx;
uint256 block_hash;
if (g_txindex->FindTx(hash, block_hash, tx)) {
if (!block_index || block_index->GetBlockHash() == block_hash) {
// Don't return the transaction if the provided block hash doesn't match.
// The case where a transaction appears in multiple blocks (e.g. reorgs or
// BIP30) is handled by the block lookup below.
hashBlock = block_hash;
return tx;
}
}
}
if (block_index) {
CBlock block;
if (blockman.ReadBlock(block, *block_index)) {
for (const auto& tx : block.vtx) {
if (tx->GetHash() == hash) {
hashBlock = block_index->GetBlockHash();
return tx;
}
}
}
}
return nullptr;
}
} // namespace node