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1 : : // Copyright (c) 2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-present The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #include <consensus/validation.h>
7 : : #include <index/txindex.h>
8 : : #include <net.h>
9 : : #include <net_processing.h>
10 : : #include <node/blockstorage.h>
11 : : #include <node/context.h>
12 : : #include <node/types.h>
13 : : #include <txmempool.h>
14 : : #include <validation.h>
15 : : #include <validationinterface.h>
16 : : #include <node/transaction.h>
17 : :
18 : : namespace node {
19 : 188 : static TransactionError HandleATMPError(const TxValidationState& state, std::string& err_string_out)
20 : : {
21 : 188 : err_string_out = state.ToString();
22 [ + - ]: 188 : if (state.IsInvalid()) {
23 [ + + ]: 188 : if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS) {
24 : : return TransactionError::MISSING_INPUTS;
25 : : }
26 : 169 : return TransactionError::MEMPOOL_REJECTED;
27 : : } else {
28 : : return TransactionError::MEMPOOL_ERROR;
29 : : }
30 : : }
31 : :
32 : 188 : TransactionError BroadcastTransaction(NodeContext& node,
33 : : const CTransactionRef tx,
34 : : std::string& err_string,
35 : : const CAmount& max_tx_fee,
36 : : TxBroadcast broadcast_method,
37 : : bool wait_callback)
38 : : {
39 : : // BroadcastTransaction can be called by RPC or by the wallet.
40 : : // chainman, mempool and peerman are initialized before the RPC server and wallet are started
41 : : // and reset after the RPC sever and wallet are stopped.
42 [ - + ]: 188 : assert(node.chainman);
43 [ - + ]: 188 : assert(node.mempool);
44 [ - + ]: 188 : assert(node.peerman);
45 : :
46 : 188 : Txid txid = tx->GetHash();
47 : 188 : Wtxid wtxid = tx->GetWitnessHash();
48 : 188 : bool callback_set = false;
49 : :
50 : 188 : {
51 : 188 : LOCK(cs_main);
52 : :
53 : : // If the transaction is already confirmed in the chain, don't do anything
54 : : // and return early.
55 [ + - + - ]: 188 : CCoinsViewCache &view = node.chainman->ActiveChainstate().CoinsTip();
56 [ - + + + ]: 548636 : for (size_t o = 0; o < tx->vout.size(); o++) {
57 [ + - ]: 548448 : const Coin& existingCoin = view.AccessCoin(COutPoint(txid, o));
58 : : // IsSpent doesn't mean the coin is spent, it means the output doesn't exist.
59 : : // So if the output does exist, then this transaction exists in the chain.
60 [ + - ]: 548448 : if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_UTXO_SET;
61 : : }
62 : :
63 [ + - - + ]: 188 : if (auto mempool_tx = node.mempool->get(txid); mempool_tx) {
64 : : // There's already a transaction in the mempool with this txid. Don't
65 : : // try to submit this transaction to the mempool (since it'll be
66 : : // rejected as a TX_CONFLICT), but do attempt to reannounce the mempool
67 : : // transaction if broadcast_method is not TxBroadcast::MEMPOOL_NO_BROADCAST.
68 : : //
69 : : // The mempool transaction may have the same or different witness (and
70 : : // wtxid) as this transaction. Use the mempool's wtxid for reannouncement.
71 : 0 : wtxid = mempool_tx->GetWitnessHash();
72 : : } else {
73 : : // Transaction is not already in the mempool.
74 : 188 : const bool check_max_fee{max_tx_fee > 0};
75 [ + + ]: 188 : if (check_max_fee || broadcast_method == TxBroadcast::NO_MEMPOOL_PRIVATE_BROADCAST) {
76 : : // First, call ATMP with test_accept and check the fee. If ATMP
77 : : // fails here, return error immediately.
78 [ + - ]: 184 : const MempoolAcceptResult result = node.chainman->ProcessTransaction(tx, /*test_accept=*/ true);
79 [ + - ]: 184 : if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
80 [ + - ]: 184 : return HandleATMPError(result.m_state, err_string);
81 [ # # # # ]: 0 : } else if (check_max_fee && result.m_base_fees.value() > max_tx_fee) {
82 : : return TransactionError::MAX_FEE_EXCEEDED;
83 : : }
84 : 184 : }
85 : :
86 [ + - ]: 4 : switch (broadcast_method) {
87 : 4 : case TxBroadcast::MEMPOOL_NO_BROADCAST:
88 : 4 : case TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL:
89 : : // Try to submit the transaction to the mempool.
90 : 4 : {
91 : 4 : const MempoolAcceptResult result =
92 [ + - ]: 4 : node.chainman->ProcessTransaction(tx, /*test_accept=*/false);
93 [ + - ]: 4 : if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
94 [ + - ]: 4 : return HandleATMPError(result.m_state, err_string);
95 : : }
96 : 4 : }
97 : : // Transaction was accepted to the mempool.
98 : :
99 [ # # ]: 0 : if (broadcast_method == TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL) {
100 : : // the mempool tracks locally submitted transactions to make a
101 : : // best-effort of initial broadcast
102 [ # # ]: 0 : node.mempool->AddUnbroadcastTx(txid);
103 : : }
104 : : break;
105 : : case TxBroadcast::NO_MEMPOOL_PRIVATE_BROADCAST:
106 : : break;
107 : : }
108 : :
109 [ # # # # ]: 0 : if (wait_callback && node.validation_signals) {
110 : : // For transactions broadcast from outside the wallet, make sure
111 : : // that the wallet has been notified of the transaction before
112 : : // continuing.
113 : : //
114 : : // This prevents a race where a user might call sendrawtransaction
115 : : // with a transaction to/from their wallet, immediately call some
116 : : // wallet RPC, and get a stale result because callbacks have not
117 : : // yet been processed.
118 : : callback_set = true;
119 : : }
120 [ - - ]: 188 : }
121 : 188 : } // cs_main
122 : :
123 [ # # ]: 0 : if (callback_set) {
124 : : // Wait until Validation Interface clients have been notified of the
125 : : // transaction entering the mempool.
126 : 0 : node.validation_signals->SyncWithValidationInterfaceQueue();
127 : : }
128 : :
129 [ # # # ]: 0 : switch (broadcast_method) {
130 : : case TxBroadcast::MEMPOOL_NO_BROADCAST:
131 : : break;
132 : 0 : case TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL:
133 : 0 : node.peerman->InitiateTxBroadcastToAll(txid, wtxid);
134 : 0 : break;
135 : 0 : case TxBroadcast::NO_MEMPOOL_PRIVATE_BROADCAST:
136 : 0 : node.peerman->InitiateTxBroadcastPrivate(tx);
137 : 0 : break;
138 : : }
139 : :
140 : : return TransactionError::OK;
141 : : }
142 : :
143 : 3 : CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const Txid& hash, const BlockManager& blockman, uint256& hashBlock)
144 : : {
145 [ + + ]: 3 : if (mempool && !block_index) {
146 : 2 : CTransactionRef ptx = mempool->get(hash);
147 [ + - ]: 2 : if (ptx) return ptx;
148 : 3 : }
149 [ - + ]: 3 : if (g_txindex) {
150 : 0 : CTransactionRef tx;
151 : 0 : uint256 block_hash;
152 [ # # # # ]: 0 : if (g_txindex->FindTx(hash, block_hash, tx)) {
153 [ # # # # ]: 0 : if (!block_index || block_index->GetBlockHash() == block_hash) {
154 : : // Don't return the transaction if the provided block hash doesn't match.
155 : : // The case where a transaction appears in multiple blocks (e.g. reorgs or
156 : : // BIP30) is handled by the block lookup below.
157 : 0 : hashBlock = block_hash;
158 [ # # ]: 0 : return tx;
159 : : }
160 : : }
161 : 0 : }
162 [ + + ]: 3 : if (block_index) {
163 : 1 : CBlock block;
164 [ + - + - ]: 1 : if (blockman.ReadBlock(block, *block_index)) {
165 [ + + ]: 2 : for (const auto& tx : block.vtx) {
166 [ - + ]: 1 : if (tx->GetHash() == hash) {
167 : 0 : hashBlock = block_index->GetBlockHash();
168 [ # # ]: 0 : return tx;
169 : : }
170 : : }
171 : : }
172 : 1 : }
173 : 3 : return nullptr;
174 : : }
175 : : } // namespace node
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