Chainparams: Refactor: Decouple IsSuperMajority from Params()

Author: jtimon

src/chainparams.h

@@ -50,9 +50,6 @@ class CChainParams
     const std::vector<unsigned char>& AlertKey() const { return vAlertPubKey; }
     int GetDefaultPort() const { return nDefaultPort; }
     int SubsidyHalvingInterval() const { return consensus.nSubsidyHalvingInterval; }
-    int EnforceBlockUpgradeMajority() const { return consensus.nMajorityEnforceBlockUpgrade; }
-    int RejectBlockOutdatedMajority() const { return consensus.nMajorityRejectBlockOutdated; }
-    int ToCheckBlockUpgradeMajority() const { return consensus.nMajorityWindow; }
 
     /** Used if GenerateBitcoins is called with a negative number of threads */
     int DefaultMinerThreads() const { return nMinerThreads; }

src/main.cpp

@@ -75,10 +75,9 @@ void EraseOrphansFor(NodeId peer);
 
 /**
  * Returns true if there are nRequired or more blocks of minVersion or above
- * in the last Params().ToCheckBlockUpgradeMajority() blocks, starting at pstart 
- * and going backwards.
+ * in the last Consensus::Params::nMajorityWindow blocks, starting at pstart and going backwards.
  */
-static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned int nRequired);
+static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned nRequired, const Consensus::Params& consensusParams);
 static void CheckBlockIndex();
 
 /** Constant stuff for coinbase transactions we create: */
@@ -1747,7 +1746,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
     unsigned int flags = fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE;
 
     // Start enforcing the DERSIG (BIP66) rules, for block.nVersion=3 blocks, when 75% of the network has upgraded:
-    if (block.nVersion >= 3 && IsSuperMajority(3, pindex->pprev, Params().EnforceBlockUpgradeMajority())) {
+    if (block.nVersion >= 3 && IsSuperMajority(3, pindex->pprev, chainparams.GetConsensus().nMajorityEnforceBlockUpgrade, chainparams.GetConsensus())) {
         flags |= SCRIPT_VERIFY_DERSIG;
     }
 
@@ -2644,25 +2643,22 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
     }
 
     // Reject block.nVersion=1 blocks when 95% (75% on testnet) of the network has upgraded:
-    if (block.nVersion < 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityRejectBlockOutdated))
-    {
+    if (block.nVersion < 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))
         return state.Invalid(error("%s: rejected nVersion=1 block", __func__),
                              REJECT_OBSOLETE, "bad-version");
-    }
 
     // Reject block.nVersion=2 blocks when 95% (75% on testnet) of the network has upgraded:
-    if (block.nVersion < 3 && IsSuperMajority(3, pindexPrev, consensusParams.nMajorityRejectBlockOutdated))
-    {
+    if (block.nVersion < 3 && IsSuperMajority(3, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))
         return state.Invalid(error("%s : rejected nVersion=2 block", __func__),
                              REJECT_OBSOLETE, "bad-version");
-    }
 
     return true;
 }
 
 bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIndex * const pindexPrev)
 {
     const int nHeight = pindexPrev == NULL ? 0 : pindexPrev->nHeight + 1;
+    const Consensus::Params& consensusParams = Params().GetConsensus();
 
     // Check that all transactions are finalized
     BOOST_FOREACH(const CTransaction& tx, block.vtx)
@@ -2672,7 +2668,7 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn
 
     // Enforce block.nVersion=2 rule that the coinbase starts with serialized block height
     // if 750 of the last 1,000 blocks are version 2 or greater (51/100 if testnet):
-    if (block.nVersion >= 2 && IsSuperMajority(2, pindexPrev, Params().EnforceBlockUpgradeMajority()))
+    if (block.nVersion >= 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityEnforceBlockUpgrade, consensusParams))
     {
         CScript expect = CScript() << nHeight;
         if (block.vtx[0].vin[0].scriptSig.size() < expect.size() ||
@@ -2779,11 +2775,10 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex** ppindex,
     return true;
 }
 
-static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned int nRequired)
+static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned nRequired, const Consensus::Params& consensusParams)
 {
-    unsigned int nToCheck = Params().ToCheckBlockUpgradeMajority();
     unsigned int nFound = 0;
-    for (unsigned int i = 0; i < nToCheck && nFound < nRequired && pstart != NULL; i++)
+    for (int i = 0; i < consensusParams.nMajorityWindow && nFound < nRequired && pstart != NULL; i++)
     {
         if (pstart->nVersion >= minVersion)
             ++nFound;