Bugfix: Use pre-BIP141 sigops until segwit activates

Author: luke-jr

src/rpc/mining.cpp

@@ -546,6 +546,9 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
     UpdateTime(pblock, consensusParams, pindexPrev);
     pblock->nNonce = 0;
 
+    // NOTE: If at some point we support pre-segwit miners post-segwit-activation, this needs to take segwit support into consideration
+    const bool fPreSegWit = (THRESHOLD_ACTIVE != VersionBitsState(pindexPrev, consensusParams, Consensus::DEPLOYMENT_SEGWIT, versionbitscache));
+
     UniValue aCaps(UniValue::VARR); aCaps.push_back("proposal");
 
     UniValue transactions(UniValue::VARR);
@@ -574,7 +577,12 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
 
         int index_in_template = i - 1;
         entry.push_back(Pair("fee", pblocktemplate->vTxFees[index_in_template]));
-        entry.push_back(Pair("sigops", pblocktemplate->vTxSigOpsCost[index_in_template]));
+        int64_t nTxSigOps = pblocktemplate->vTxSigOpsCost[index_in_template];
+        if (fPreSegWit) {
+            assert(nTxSigOps % WITNESS_SCALE_FACTOR == 0);
+            nTxSigOps /= WITNESS_SCALE_FACTOR;
+        }
+        entry.push_back(Pair("sigops", nTxSigOps));
         entry.push_back(Pair("weight", GetTransactionWeight(tx)));
 
         transactions.push_back(entry);
@@ -657,7 +665,12 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
     result.push_back(Pair("mintime", (int64_t)pindexPrev->GetMedianTimePast()+1));
     result.push_back(Pair("mutable", aMutable));
     result.push_back(Pair("noncerange", "00000000ffffffff"));
-    result.push_back(Pair("sigoplimit", (int64_t)MAX_BLOCK_SIGOPS_COST));
+    int64_t nSigOpLimit = MAX_BLOCK_SIGOPS_COST;
+    if (fPreSegWit) {
+        assert(nSigOpLimit % WITNESS_SCALE_FACTOR == 0);
+        nSigOpLimit /= WITNESS_SCALE_FACTOR;
+    }
+    result.push_back(Pair("sigoplimit", nSigOpLimit));
     result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SERIALIZED_SIZE));
     result.push_back(Pair("weightlimit", (int64_t)MAX_BLOCK_WEIGHT));
     result.push_back(Pair("curtime", pblock->GetBlockTime()));