Show softfork status in getblockchaininfo

Rebased-From: 5ed10793c2df970d07cecd760c42205e68779e83

src/rpcblockchain.cpp

@@ -466,6 +466,36 @@ Value verifychain(const Array& params, bool fHelp)
     return CVerifyDB().VerifyDB(pcoinsTip, nCheckLevel, nCheckDepth);
 }
 
+/** Implementation of IsSuperMajority with better feedback */
+Object SoftForkMajorityDesc(int minVersion, CBlockIndex* pindex, int nRequired, const Consensus::Params& consensusParams)
+{
+    int nFound = 0;
+    CBlockIndex* pstart = pindex;
+    for (int i = 0; i < consensusParams.nMajorityWindow && pstart != NULL; i++)
+    {
+        if (pstart->nVersion >= minVersion)
+            ++nFound;
+        pstart = pstart->pprev;
+    }
+
+    Object rv;
+    rv.push_back(Pair("status", nFound >= nRequired));
+    rv.push_back(Pair("found", nFound));
+    rv.push_back(Pair("required", nRequired));
+    rv.push_back(Pair("window", consensusParams.nMajorityWindow));
+    return rv;
+}
+
+Object SoftForkDesc(const std::string &name, int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
+{
+    Object rv;
+    rv.push_back(Pair("id", name));
+    rv.push_back(Pair("version", version));
+    rv.push_back(Pair("enforce", SoftForkMajorityDesc(version, pindex, consensusParams.nMajorityEnforceBlockUpgrade, consensusParams)));
+    rv.push_back(Pair("reject", SoftForkMajorityDesc(version, pindex, consensusParams.nMajorityRejectBlockOutdated, consensusParams)));
+    return rv;
+}
+
 Value getblockchaininfo(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() != 0)
@@ -481,6 +511,19 @@ Value getblockchaininfo(const Array& params, bool fHelp)
             "  \"difficulty\": xxxxxx,     (numeric) the current difficulty\n"
             "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
             "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
+            "  \"softforks\": [            (array) status of softforks in progress\n"
+            "     {\n"
+            "        \"id\": \"xxxx\",        (string) name of softfork\n"
+            "        \"version\": xx,         (numeric) block version\n"
+            "        \"enforce\": {           (object) progress toward enforcing the softfork rules for new-version blocks\n"
+            "           \"status\": xx,       (boolean) true if threshold reached\n"
+            "           \"found\": xx,        (numeric) number of blocks with the new version found\n"
+            "           \"required\": xx,     (numeric) number of blocks required to trigger\n"
+            "           \"window\": xx,       (numeric) maximum size of examined window of recent blocks\n"
+            "        },\n"
+            "        \"reject\": { ... }      (object) progress toward rejecting pre-softfork blocks (same fields as \"enforce\")\n"
+            "     }, ...\n"
+            "  ]\n"
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("getblockchaininfo", "")
@@ -498,6 +541,14 @@ Value getblockchaininfo(const Array& params, bool fHelp)
     obj.push_back(Pair("verificationprogress",  Checkpoints::GuessVerificationProgress(Params().Checkpoints(), chainActive.Tip())));
     obj.push_back(Pair("chainwork",             chainActive.Tip()->nChainWork.GetHex()));
     obj.push_back(Pair("pruned",                fPruneMode));
+
+    const Consensus::Params& consensusParams = Params().GetConsensus();
+    CBlockIndex* tip = chainActive.Tip();
+    Array softforks;
+    softforks.push_back(SoftForkDesc("bip34", 2, tip, consensusParams));
+    softforks.push_back(SoftForkDesc("bip66", 3, tip, consensusParams));
+    obj.push_back(Pair("softforks",             softforks));
+
     if (fPruneMode)
     {
         CBlockIndex *block = chainActive.Tip();