refactor: rid-of magic constant by introducing MasternodePayments::PlatformShare

Author: knst

src/masternode/payments.cpp

@@ -22,6 +22,7 @@
 #include <validation.h>
 #include <evo/creditpool.h>
 
+#include <cassert>
 #include <string>
 
 /**
@@ -40,10 +41,9 @@ static bool GetBlockTxOuts(const int nBlockHeight, const CAmount blockReward, st
     bool fMNRewardReallocated =  llmq::utils::IsMNRewardReallocationActive(pindex);
 
     if (fMNRewardReallocated) {
-        const CAmount platformReward = masternodeReward * 0.375;
+        const CAmount platformReward = MasternodePayments::PlatformShare(masternodeReward);
         masternodeReward -= platformReward;
 
-        assert(MoneyRange(platformReward));
         assert(MoneyRange(masternodeReward));
 
         LogPrint(BCLog::MNPAYMENTS, "CMasternodePayments::%s -- MN reward %lld reallocated to credit pool\n", __func__, platformReward);
@@ -345,4 +345,13 @@ void FillBlockPayments(const CSporkManager& sporkManager, CGovernanceManager& go
                             nBlockHeight, blockReward, voutMasternodeStr, txNew.ToString());
 }
 
+CAmount PlatformShare(const CAmount reward)
+{
+    constexpr double platformShare = 0.375;
+    const CAmount platformReward = reward * platformShare;
+    assert(MoneyRange(platformReward));
+
+    return platformReward;
+}
+
 } // namespace MasternodePayments

src/masternode/payments.h

@@ -32,6 +32,13 @@ bool IsBlockPayeeValid(const CSporkManager& sporkManager, CGovernanceManager& go
 void FillBlockPayments(const CSporkManager& sporkManager, CGovernanceManager& governanceManager,
                        CMutableTransaction& txNew, const int nBlockHeight, const CAmount blockReward,
                        std::vector<CTxOut>& voutMasternodePaymentsRet, std::vector<CTxOut>& voutSuperblockPaymentsRet);
+
+/**
+ * this helper returns amount that should be reallocated to platform
+ * it is calculated based on total amount of Masternode rewards (not block reward)
+ */
+CAmount PlatformShare(const CAmount masternodeReward);
+
 } // namespace MasternodePayments
 
 #endif // BITCOIN_MASTERNODE_PAYMENTS_H

src/miner.cpp

@@ -235,7 +235,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
                 bool fMNRewardReallocated = llmq::utils::IsMNRewardReallocationActive(pindexPrev);
                 if (fMNRewardReallocated) {
                     const CAmount masternodeReward = GetMasternodePayment(nHeight, blockReward, Params().GetConsensus().BRRHeight);
-                    const CAmount reallocedReward = masternodeReward * 0.375;
+                    const CAmount reallocedReward = MasternodePayments::PlatformShare(masternodeReward);
                     LogPrint(BCLog::MNPAYMENTS, "%s: add MN reward %lld (%lld) to credit pool\n", __func__, masternodeReward, reallocedReward);
                     creditPoolDiff->AddRewardRealloced(reallocedReward);
                 }

src/test/block_reward_reallocation_tests.cpp

@@ -26,6 +26,7 @@
 #include <llmq/context.h>
 #include <llmq/instantsend.h>
 #include <llmq/utils.h>
+#include <masternode/payments.h>
 #include <util/enumerate.h>
 #include <util/irange.h>
 
@@ -257,7 +258,7 @@ BOOST_FIXTURE_TEST_CASE(block_reward_reallocation, TestChainBRRBeforeActivationS
 
         bool isMNRewardReallocated = llmq::utils::IsMNRewardReallocationActive(::ChainActive().Tip());
         if (isMNRewardReallocated) {
-            CAmount platform_payment = 0.375 * masternode_payment;
+            const CAmount platform_payment = MasternodePayments::PlatformShare(masternode_payment);
             masternode_payment -= platform_payment;
         }
         size_t payment_index = isMNRewardReallocated ? 1 : 0;
@@ -269,7 +270,7 @@ BOOST_FIXTURE_TEST_CASE(block_reward_reallocation, TestChainBRRBeforeActivationS
         // Reward split should reach ~60/40 after reallocation is done
         LOCK(cs_main);
         CAmount masternode_payment = GetMasternodePayment(::ChainActive().Height(), GetBlockSubsidyInner(::ChainActive().Tip()->nBits, ::ChainActive().Height(), consensus_params), 2500);
-        CAmount platform_payment = 0.375 * masternode_payment;
+        const CAmount platform_payment = MasternodePayments::PlatformShare(masternode_payment);
         masternode_payment -= platform_payment;
         const auto pblocktemplate = BlockAssembler(*sporkManager, *governance, *m_node.llmq_ctx, *m_node.evodb, ::ChainstateActive(), *m_node.mempool, Params()).CreateNewBlock(coinbasePubKey);
         BOOST_CHECK_EQUAL(pblocktemplate->block.vtx[0]->GetValueOut(), 9491484944);