refactor: Use typesafe Wtxid in compact block encoding message, instead of ambiguous uint256.

Wtxid/Txid types introduced in bitcoin#28107

Author: AngusP

src/blockencodings.cpp

@@ -40,14 +40,14 @@ void CBlockHeaderAndShortTxIDs::FillShortTxIDSelector() const {
     shorttxidk1 = shorttxidhash.GetUint64(1);
 }
 
-uint64_t CBlockHeaderAndShortTxIDs::GetShortID(const uint256& txhash) const {
+uint64_t CBlockHeaderAndShortTxIDs::GetShortID(const Wtxid& wtxid) const {
     static_assert(SHORTTXIDS_LENGTH == 6, "shorttxids calculation assumes 6-byte shorttxids");
-    return SipHashUint256(shorttxidk0, shorttxidk1, txhash) & 0xffffffffffffL;
+    return SipHashUint256(shorttxidk0, shorttxidk1, wtxid) & 0xffffffffffffL;
 }
 
 
 
-ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<uint256, CTransactionRef>>& extra_txn) {
+ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<Wtxid, CTransactionRef>>& extra_txn) {
     if (cmpctblock.header.IsNull() || (cmpctblock.shorttxids.empty() && cmpctblock.prefilledtxn.empty()))
         return READ_STATUS_INVALID;
     if (cmpctblock.shorttxids.size() + cmpctblock.prefilledtxn.size() > MAX_BLOCK_WEIGHT / MIN_SERIALIZABLE_TRANSACTION_WEIGHT)

src/blockencodings.h

@@ -111,7 +111,7 @@ class CBlockHeaderAndShortTxIDs {
 
     CBlockHeaderAndShortTxIDs(const CBlock& block);
 
-    uint64_t GetShortID(const uint256& txhash) const;
+    uint64_t GetShortID(const Wtxid& wtxid) const;
 
     size_t BlockTxCount() const { return shorttxids.size() + prefilledtxn.size(); }
 
@@ -142,7 +142,7 @@ class PartiallyDownloadedBlock {
     explicit PartiallyDownloadedBlock(CTxMemPool* poolIn) : pool(poolIn) {}
 
     // extra_txn is a list of extra transactions to look at, in <witness hash, reference> form
-    ReadStatus InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<uint256, CTransactionRef>>& extra_txn);
+    ReadStatus InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<Wtxid, CTransactionRef>>& extra_txn);
     bool IsTxAvailable(size_t index) const;
     ReadStatus FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing);
 };

src/net_processing.cpp

@@ -1006,7 +1006,7 @@ class PeerManagerImpl final : public PeerManager
     /** Orphan/conflicted/etc transactions that are kept for compact block reconstruction.
      *  The last -blockreconstructionextratxn/DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN of
      *  these are kept in a ring buffer */
-    std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_msgproc_mutex);
+    std::vector<std::pair<Wtxid, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_msgproc_mutex);
     /** Offset into vExtraTxnForCompact to insert the next tx */
     size_t vExtraTxnForCompactIt GUARDED_BY(g_msgproc_mutex) = 0;
 

src/test/blockencodings_tests.cpp

@@ -14,7 +14,7 @@
 
 #include <boost/test/unit_test.hpp>
 
-std::vector<std::pair<uint256, CTransactionRef>> extra_txn;
+std::vector<std::pair<Wtxid, CTransactionRef>> extra_txn;
 
 BOOST_FIXTURE_TEST_SUITE(blockencodings_tests, RegTestingSetup)
 
@@ -126,7 +126,7 @@ class TestHeaderAndShortIDs {
     explicit TestHeaderAndShortIDs(const CBlock& block) :
         TestHeaderAndShortIDs(CBlockHeaderAndShortTxIDs{block}) {}
 
-    uint64_t GetShortID(const uint256& txhash) const {
+    uint64_t GetShortID(const Wtxid& txhash) const {
         DataStream stream{};
         stream << *this;
         CBlockHeaderAndShortTxIDs base;
@@ -155,8 +155,8 @@ BOOST_AUTO_TEST_CASE(NonCoinbasePreforwardRTTest)
         shortIDs.prefilledtxn.resize(1);
         shortIDs.prefilledtxn[0] = {1, block.vtx[1]};
         shortIDs.shorttxids.resize(2);
-        shortIDs.shorttxids[0] = shortIDs.GetShortID(block.vtx[0]->GetHash());
-        shortIDs.shorttxids[1] = shortIDs.GetShortID(block.vtx[2]->GetHash());
+        shortIDs.shorttxids[0] = shortIDs.GetShortID(block.vtx[0]->GetWitnessHash());
+        shortIDs.shorttxids[1] = shortIDs.GetShortID(block.vtx[2]->GetWitnessHash());
 
         DataStream stream{};
         stream << shortIDs;
@@ -226,7 +226,7 @@ BOOST_AUTO_TEST_CASE(SufficientPreforwardRTTest)
         shortIDs.prefilledtxn[0] = {0, block.vtx[0]};
         shortIDs.prefilledtxn[1] = {1, block.vtx[2]}; // id == 1 as it is 1 after index 1
         shortIDs.shorttxids.resize(1);
-        shortIDs.shorttxids[0] = shortIDs.GetShortID(block.vtx[1]->GetHash());
+        shortIDs.shorttxids[0] = shortIDs.GetShortID(block.vtx[1]->GetWitnessHash());
 
         DataStream stream{};
         stream << shortIDs;

src/test/fuzz/partially_downloaded_block.cpp

@@ -60,7 +60,7 @@ FUZZ_TARGET(partially_downloaded_block, .init = initialize_pdb)
     // The coinbase is always available
     available.insert(0);
 
-    std::vector<std::pair<uint256, CTransactionRef>> extra_txn;
+    std::vector<std::pair<Wtxid, CTransactionRef>> extra_txn;
     for (size_t i = 1; i < block->vtx.size(); ++i) {
         auto tx{block->vtx[i]};