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author | glozow <gloriajzhao@gmail.com> | 2022-04-20 14:04:11 -0700 |
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committer | glozow <gloriajzhao@gmail.com> | 2022-05-30 16:00:41 -0700 |
commit | 21187506311d1703d2bca21ccc17c3a921454b70 (patch) | |
tree | f3d589b7bbb7a77f8d8d666f0d967fb8bc8ab661 /src/test/util/setup_common.cpp | |
parent | 5374dfc4e3da0e6a76f33b42966b4acf446233dc (diff) | |
download | bitcoin-21187506311d1703d2bca21ccc17c3a921454b70.tar.xz |
[test util] to populate mempool with random transactions/packages
Diffstat (limited to 'src/test/util/setup_common.cpp')
-rw-r--r-- | src/test/util/setup_common.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/test/util/setup_common.cpp b/src/test/util/setup_common.cpp index 76bdf37cd7..01f41ccf82 100644 --- a/src/test/util/setup_common.cpp +++ b/src/test/util/setup_common.cpp @@ -43,6 +43,7 @@ #include <validationinterface.h> #include <walletinitinterface.h> +#include <algorithm> #include <functional> #include <stdexcept> @@ -357,6 +358,52 @@ CMutableTransaction TestChain100Setup::CreateValidMempoolTransaction(CTransactio return mempool_txn; } +std::vector<CTransactionRef> TestChain100Setup::PopulateMempool(FastRandomContext& det_rand, size_t num_transactions, bool submit) +{ + std::vector<CTransactionRef> mempool_transactions; + std::deque<std::pair<COutPoint, CAmount>> unspent_prevouts; + std::transform(m_coinbase_txns.begin(), m_coinbase_txns.end(), std::back_inserter(unspent_prevouts), + [](const auto& tx){ return std::make_pair(COutPoint(tx->GetHash(), 0), tx->vout[0].nValue); }); + while (num_transactions > 0 && !unspent_prevouts.empty()) { + // The number of inputs and outputs are random, between 1 and 24. + CMutableTransaction mtx = CMutableTransaction(); + const size_t num_inputs = det_rand.randrange(24) + 1; + CAmount total_in{0}; + for (size_t n{0}; n < num_inputs; ++n) { + if (unspent_prevouts.empty()) break; + const auto& [prevout, amount] = unspent_prevouts.front(); + mtx.vin.push_back(CTxIn(prevout, CScript())); + total_in += amount; + unspent_prevouts.pop_front(); + } + const size_t num_outputs = det_rand.randrange(24) + 1; + // Approximately 1000sat "fee," equal output amounts. + const CAmount amount_per_output = (total_in - 1000) / num_outputs; + for (size_t n{0}; n < num_outputs; ++n) { + CScript spk = CScript() << CScriptNum(num_transactions + n); + mtx.vout.push_back(CTxOut(amount_per_output, spk)); + } + CTransactionRef ptx = MakeTransactionRef(mtx); + mempool_transactions.push_back(ptx); + if (amount_per_output > 2000) { + // If the value is high enough to fund another transaction + fees, keep track of it so + // it can be used to build a more complex transaction graph. Insert randomly into + // unspent_prevouts for extra randomness in the resulting structures. + for (size_t n{0}; n < num_outputs; ++n) { + unspent_prevouts.push_back(std::make_pair(COutPoint(ptx->GetHash(), n), amount_per_output)); + std::swap(unspent_prevouts.back(), unspent_prevouts[det_rand.randrange(unspent_prevouts.size())]); + } + } + if (submit) { + LOCK2(m_node.mempool->cs, cs_main); + LockPoints lp; + m_node.mempool->addUnchecked(CTxMemPoolEntry(ptx, 1000, 0, 1, false, 4, lp)); + } + --num_transactions; + } + return mempool_transactions; +} + CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CMutableTransaction& tx) const { return FromTx(MakeTransactionRef(tx)); |