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       1                 :            : // Copyright (c) 2010 Satoshi Nakamoto
       2                 :            : // Copyright (c) 2009-2021 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 <txmempool.h>
      13                 :            : #include <validation.h>
      14                 :            : #include <validationinterface.h>
      15                 :            : #include <node/transaction.h>
      16                 :            : 
      17                 :            : #include <future>
      18                 :            : 
      19                 :            : namespace node {
      20                 :          0 : static TransactionError HandleATMPError(const TxValidationState& state, std::string& err_string_out)
      21                 :            : {
      22                 :          0 :     err_string_out = state.ToString();
      23         [ #  # ]:          0 :     if (state.IsInvalid()) {
      24         [ #  # ]:          0 :         if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS) {
      25                 :          0 :             return TransactionError::MISSING_INPUTS;
      26                 :            :         }
      27                 :          2 :         return TransactionError::MEMPOOL_REJECTED;
      28                 :            :     } else {
      29                 :          0 :         return TransactionError::MEMPOOL_ERROR;
      30                 :            :     }
      31                 :          0 : }
      32                 :            : 
      33                 :          0 : TransactionError BroadcastTransaction(NodeContext& node, const CTransactionRef tx, std::string& err_string, const CAmount& max_tx_fee, bool relay, bool wait_callback)
      34                 :            : {
      35                 :            :     // BroadcastTransaction can be called by either sendrawtransaction RPC or the wallet.
      36                 :            :     // chainman, mempool and peerman are initialized before the RPC server and wallet are started
      37                 :            :     // and reset after the RPC sever and wallet are stopped.
      38         [ #  # ]:          0 :     assert(node.chainman);
      39         [ #  # ]:          0 :     assert(node.mempool);
      40         [ #  # ]:          0 :     assert(node.peerman);
      41                 :            : 
      42                 :          0 :     std::promise<void> promise;
      43         [ #  # ]:          0 :     Txid txid = tx->GetHash();
      44 [ #  # ][ #  # ]:          0 :     uint256 wtxid = tx->GetWitnessHash();
      45                 :          0 :     bool callback_set = false;
      46                 :            : 
      47                 :            :     {
      48 [ #  # ][ #  # ]:          0 :         LOCK(cs_main);
      49                 :            : 
      50                 :            :         // If the transaction is already confirmed in the chain, don't do anything
      51                 :            :         // and return early.
      52 [ #  # ][ #  # ]:          0 :         CCoinsViewCache &view = node.chainman->ActiveChainstate().CoinsTip();
      53         [ #  # ]:          0 :         for (size_t o = 0; o < tx->vout.size(); o++) {
      54 [ #  # ][ #  # ]:          0 :             const Coin& existingCoin = view.AccessCoin(COutPoint(txid, o));
      55                 :            :             // IsSpent doesn't mean the coin is spent, it means the output doesn't exist.
      56                 :            :             // So if the output does exist, then this transaction exists in the chain.
      57 [ #  # ][ #  # ]:          0 :             if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_CHAIN;
      58                 :          0 :         }
      59                 :            : 
      60 [ #  # ][ #  # ]:          0 :         if (auto mempool_tx = node.mempool->get(txid); mempool_tx) {
         [ #  # ][ #  # ]
      61                 :            :             // There's already a transaction in the mempool with this txid. Don't
      62                 :            :             // try to submit this transaction to the mempool (since it'll be
      63                 :            :             // rejected as a TX_CONFLICT), but do attempt to reannounce the mempool
      64                 :            :             // transaction if relay=true.
      65                 :            :             //
      66                 :            :             // The mempool transaction may have the same or different witness (and
      67                 :            :             // wtxid) as this transaction. Use the mempool's wtxid for reannouncement.
      68 [ #  # ][ #  # ]:          0 :             wtxid = mempool_tx->GetWitnessHash();
      69                 :          0 :         } else {
      70                 :            :             // Transaction is not already in the mempool.
      71         [ #  # ]:          0 :             if (max_tx_fee > 0) {
      72                 :            :                 // First, call ATMP with test_accept and check the fee. If ATMP
      73                 :            :                 // fails here, return error immediately.
      74         [ #  # ]:          0 :                 const MempoolAcceptResult result = node.chainman->ProcessTransaction(tx, /*test_accept=*/ true);
      75         [ #  # ]:          0 :                 if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
      76         [ #  # ]:          0 :                     return HandleATMPError(result.m_state, err_string);
      77 [ #  # ][ #  # ]:          0 :                 } else if (result.m_base_fees.value() > max_tx_fee) {
      78                 :          0 :                     return TransactionError::MAX_FEE_EXCEEDED;
      79                 :            :                 }
      80         [ #  # ]:          0 :             }
      81                 :            :             // Try to submit the transaction to the mempool.
      82         [ #  # ]:          0 :             const MempoolAcceptResult result = node.chainman->ProcessTransaction(tx, /*test_accept=*/ false);
      83         [ #  # ]:          0 :             if (result.m_result_type != MempoolAcceptResult::ResultType::VALID) {
      84         [ #  # ]:          0 :                 return HandleATMPError(result.m_state, err_string);
      85                 :            :             }
      86                 :            : 
      87                 :            :             // Transaction was accepted to the mempool.
      88                 :            : 
      89         [ #  # ]:          0 :             if (relay) {
      90                 :            :                 // the mempool tracks locally submitted transactions to make a
      91                 :            :                 // best-effort of initial broadcast
      92 [ #  # ][ #  # ]:          0 :                 node.mempool->AddUnbroadcastTx(txid);
      93                 :          0 :             }
      94                 :            : 
      95         [ #  # ]:          0 :             if (wait_callback) {
      96                 :            :                 // For transactions broadcast from outside the wallet, make sure
      97                 :            :                 // that the wallet has been notified of the transaction before
      98                 :            :                 // continuing.
      99                 :            :                 //
     100                 :            :                 // This prevents a race where a user might call sendrawtransaction
     101                 :            :                 // with a transaction to/from their wallet, immediately call some
     102                 :            :                 // wallet RPC, and get a stale result because callbacks have not
     103                 :            :                 // yet been processed.
     104         [ #  # ]:          0 :                 CallFunctionInValidationInterfaceQueue([&promise] {
     105                 :          0 :                     promise.set_value();
     106                 :          0 :                 });
     107                 :          0 :                 callback_set = true;
     108                 :          0 :             }
     109         [ #  # ]:          0 :         }
     110         [ #  # ]:          0 :     } // cs_main
     111                 :            : 
     112         [ #  # ]:          0 :     if (callback_set) {
     113                 :            :         // Wait until Validation Interface clients have been notified of the
     114                 :            :         // transaction entering the mempool.
     115 [ #  # ][ #  # ]:          0 :         promise.get_future().wait();
     116                 :          0 :     }
     117                 :            : 
     118         [ #  # ]:          0 :     if (relay) {
     119 [ #  # ][ #  # ]:          0 :         node.peerman->RelayTransaction(txid, wtxid);
     120                 :          0 :     }
     121                 :            : 
     122                 :          0 :     return TransactionError::OK;
     123                 :          0 : }
     124                 :            : 
     125                 :          0 : CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const uint256& hash, uint256& hashBlock, const BlockManager& blockman)
     126                 :            : {
     127 [ #  # ][ #  # ]:          0 :     if (mempool && !block_index) {
     128                 :          0 :         CTransactionRef ptx = mempool->get(hash);
     129         [ #  # ]:          0 :         if (ptx) return ptx;
     130         [ #  # ]:          0 :     }
     131         [ #  # ]:          0 :     if (g_txindex) {
     132                 :          0 :         CTransactionRef tx;
     133         [ #  # ]:          0 :         uint256 block_hash;
     134 [ #  # ][ #  # ]:          0 :         if (g_txindex->FindTx(hash, block_hash, tx)) {
     135 [ #  # ][ #  # ]:          0 :             if (!block_index || block_index->GetBlockHash() == block_hash) {
         [ #  # ][ #  # ]
     136                 :            :                 // Don't return the transaction if the provided block hash doesn't match.
     137                 :            :                 // The case where a transaction appears in multiple blocks (e.g. reorgs or
     138                 :            :                 // BIP30) is handled by the block lookup below.
     139                 :          0 :                 hashBlock = block_hash;
     140                 :          0 :                 return tx;
     141                 :            :             }
     142                 :          0 :         }
     143         [ #  # ]:          0 :     }
     144         [ #  # ]:          0 :     if (block_index) {
     145                 :          0 :         CBlock block;
     146 [ #  # ][ #  # ]:          0 :         if (blockman.ReadBlockFromDisk(block, *block_index)) {
     147         [ #  # ]:          0 :             for (const auto& tx : block.vtx) {
     148 [ #  # ][ #  # ]:          0 :                 if (tx->GetHash() == hash) {
                 [ #  # ]
     149         [ #  # ]:          0 :                     hashBlock = block_index->GetBlockHash();
     150                 :          0 :                     return tx;
     151                 :            :                 }
     152                 :            :             }
     153                 :          0 :         }
     154         [ #  # ]:          0 :     }
     155                 :          0 :     return nullptr;
     156                 :          0 : }
     157                 :            : } // namespace node