Add getaccumulatorvalues RPC.

Return the accumulator values associated with a particular block height.

Author: presstab

src/rpcblockchain.cpp

@@ -15,6 +15,7 @@
 #include "util.h"
 #include "utilmoneystr.h"
 #include "accumulatormap.h"
+#include "accumulators.h"
 
 #include <stdint.h>
 #include <univalue.h>
@@ -929,6 +930,38 @@ UniValue findserial(const UniValue& params, bool fHelp)
     UniValue ret(UniValue::VOBJ);
     ret.push_back(Pair("success", fSuccess));
     ret.push_back(Pair("txid", txid.GetHex()));
-
     return ret;
 }
+
+UniValue getaccumulatorvalues(const UniValue& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "getaccumulatorvalues \"height\"\n"
+                    "\nReturns the accumulator values associated with a block height\n"
+
+                    "\nArguments:\n"
+                    "1. height   (numeric, required) the height of the checkpoint.\n"
+
+                    "\nExamples:\n" +
+            HelpExampleCli("getaccumulatorvalues", "\"height\"") + HelpExampleRpc("getaccumulatorvalues", "\"height\""));
+
+    int nHeight = params[0].get_int();
+
+    CBlockIndex* pindex = chainActive[nHeight];
+    if (!pindex)
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid block height");
+
+    UniValue ret(UniValue::VARR);
+    for (libzerocoin::CoinDenomination denom : libzerocoin::zerocoinDenomList) {
+        CBigNum bnValue;
+        if(!GetAccumulatorValueFromDB(pindex->nAccumulatorCheckpoint, denom, bnValue))
+            throw JSONRPCError(RPC_DATABASE_ERROR, "failed to find value in database");
+
+        UniValue obj(UniValue::VOBJ);
+        obj.push_back(Pair(std::to_string(denom), bnValue.GetHex()));
+        ret.push_back(obj);
+    }
+
+    return ret;
+}

src/rpcclient.cpp

@@ -140,6 +140,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
         {"searchdzpiv", 0},
         {"searchdzpiv", 1},
         {"searchdzpiv", 2},
+        {"getaccumulatorvalues", 0},
         {"getfeeinfo", 0}
     };
 

src/rpcserver.cpp

@@ -298,6 +298,7 @@ static const CRPCCommand vRPCCommands[] =
 
         /* Block chain and UTXO */
         {"blockchain", "findserial", &findserial, true, false, false},
+        {"blockchain", "getaccumulatorvalues", &getaccumulatorvalues, true, false, false},
         {"blockchain", "getblockchaininfo", &getblockchaininfo, true, false, false},
         {"blockchain", "getbestblockhash", &getbestblockhash, true, false, false},
         {"blockchain", "getblockcount", &getblockcount, true, false, false},

src/rpcserver.h

@@ -291,6 +291,7 @@ extern UniValue verifychain(const UniValue& params, bool fHelp);
 extern UniValue getchaintips(const UniValue& params, bool fHelp);
 extern UniValue invalidateblock(const UniValue& params, bool fHelp);
 extern UniValue reconsiderblock(const UniValue& params, bool fHelp);
+extern UniValue getaccumulatorvalues(const UniValue& params, bool fHelp);
 
 extern UniValue getpoolinfo(const UniValue& params, bool fHelp); // in rpcmasternode.cpp
 extern UniValue masternode(const UniValue& params, bool fHelp);