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rpc: reserve space for UniValue variables in blockToJSON

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- Reserving space avoid reallocation, this provide noticeable
  performance increase in verbosity level 1, 2.

Github-Pull: #31179
Rebased-From: 28e3392d11355b1160dc1a7a5557081728a02840
This commit is contained in:
ismaelsadeeq 2024-10-28 13:03:11 +01:00 committed by Luke Dashjr
parent 1c894b355e
commit 5dcab5edf5
2 changed files with 4 additions and 0 deletions
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3
src/core_write.cpp
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@ -183,6 +183,7 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
entry.pushKV("locktime", (int64_t)tx.nLockTime);
UniValue vin{UniValue::VARR};
vin.reserve(tx.vin.size());
// If available, use Undo data to calculate the fee. Note that txundo == nullptr
// for coinbase transactions and for transactions where undo data is unavailable.
@ -205,6 +206,7 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
}
if (!tx.vin[i].scriptWitness.IsNull()) {
UniValue txinwitness(UniValue::VARR);
txinwitness.reserve(tx.vin[i].scriptWitness.stack.size());
for (const auto& item : tx.vin[i].scriptWitness.stack) {
txinwitness.push_back(HexStr(item));
}
@ -234,6 +236,7 @@ void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry
entry.pushKV("vin", vin);
UniValue vout(UniValue::VARR);
vout.reserve(tx.vout.size());
for (unsigned int i = 0; i < tx.vout.size(); i++) {
const CTxOut& txout = tx.vout[i];

1
src/rpc/blockchain.cpp
View File

@ -171,6 +171,7 @@ UniValue blockToJSON(BlockManager& blockman, const CBlock& block, const CBlockIn
result.pushKV("size", (int)::GetSerializeSize(block, PROTOCOL_VERSION));
result.pushKV("weight", (int)::GetBlockWeight(block));
UniValue txs(UniValue::VARR);
txs.reserve(block.vtx.size());
switch (verbosity) {
case TxVerbosity::SHOW_TXID: