mining.cpp

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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <base58.h>
#include <amount.h>
#include <chain.h>
#include <chainparams.h>
#include <consensus/consensus.h>
#include <consensus/params.h>
#include <consensus/validation.h>
#include <core_io.h>
#include <crypto/equihash.h>
#include <init.h>
#include <validation.h>
#include <miner.h>
#include <net.h>
#include <policy/fees.h>
#include <pow.h>
#include <rpc/blockchain.h>
#include <rpc/mining.h>
#include <rpc/server.h>
#include <txmempool.h>
#include <util.h>
#include <utilstrencodings.h>
#include <validationinterface.h>
#include <warnings.h>

#ifdef ENABLE_GPU
#include <libgpusolver/libgpusolver.h>
#include <libgpusolver/libclwrapper.h>
#endif

#include <timedata.h>
#ifdef ENABLE_WALLET
#include <wallet/wallet.h>
#include <wallet/walletdb.h>
#endif
#include <memory>
#include <stdint.h>
#include <boost/assign/list_of.hpp>
#include <boost/shared_ptr.hpp>

#include <univalue.h>

unsigned int ParseConfirmTarget(const UniValue& value)
{
    int target = value.get_int();
    unsigned int max_target = ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
    if (target < 1 || (unsigned int)target > max_target) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid conf_target, must be between %u - %u", 1, max_target));
    }
    return (unsigned int)target;
}

UniValue GetNetworkHashPS(int lookup, int height) {
    CBlockIndex *pb = chainActive.Tip();

    if (height >= 0 && height < chainActive.Height())
        pb = chainActive[height];

    if (pb == nullptr || !pb->nHeight)
        return 0;

    // If lookup is -1, then use blocks since last difficulty change.
    if (lookup <= 0)
        lookup = pb->nHeight % Params().GetConsensus().DifficultyAdjustmentInterval() + 1;

    // If lookup is larger than chain, then set it to chain length.
    if (lookup > pb->nHeight)
        lookup = pb->nHeight;

    CBlockIndex *pb0 = pb;
    int64_t minTime = pb0->GetBlockTime();
    int64_t maxTime = minTime;
    for (int i = 0; i < lookup; i++) {
        pb0 = pb0->pprev;
        int64_t time = pb0->GetBlockTime();
        minTime = std::min(time, minTime);
        maxTime = std::max(time, maxTime);
    }

    // In case there's a situation where minTime == maxTime, we don't want a divide by zero exception.
    if (minTime == maxTime)
        return 0;

    arith_uint256 workDiff = pb->nChainWork - pb0->nChainWork;
    int64_t timeDiff = maxTime - minTime;

    return workDiff.getdouble() / timeDiff;
}

// TODO(h4x3rotab): Implement RPC `getlocalsolps`, and maybe `getnetworksolps` as a alias of `getnetworkhashps`.

UniValue getnetworkhashps(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            "getnetworkhashps ( nblocks height )\n"
            "\nReturns the estimated network hashes per second based on the last n blocks.\n"
            "Pass in [blocks] to override # of blocks, -1 specifies since last difficulty change.\n"
            "Pass in [height] to estimate the network speed at the time when a certain block was found.\n"
            "\nArguments:\n"
            "1. nblocks     (numeric, optional, default=120) The number of blocks, or -1 for blocks since last difficulty change.\n"
            "2. height      (numeric, optional, default=-1) To estimate at the time of the given height.\n"
            "\nResult:\n"
            "x             (numeric) Hashes per second estimated\n"
            "\nExamples:\n"
            + HelpExampleCli("getnetworkhashps", "")
            + HelpExampleRpc("getnetworkhashps", "")
       );

    LOCK(cs_main);
    return GetNetworkHashPS(!request.params[0].isNull() ? request.params[0].get_int() : 120, !request.params[1].isNull() ? request.params[1].get_int() : -1);
}


#if defined(ENABLE_GPU) &&  defined(USE_CUDA)
#include <../cuda/eqcuda.hpp>

static bool cb_cancel() 
{
    return false;
}

static bool cb_validate(std::vector<unsigned char> sols, unsigned char *pblockdata, int thrid)
{
    bool ret = false;
    CBlock *pblock = (CBlock *)pblockdata;  

    do 
    {
        pblock->nSolution = sols;
        CChainParams chainparams = Params();
        arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits);
        if (UintToArith256(pblock->GetHash()) > hashTarget) 
        {
            break;
        }
        // Found a solution
        SetThreadPriority(THREAD_PRIORITY_NORMAL);
        
        if (!CheckEquihashSolution(pblock, chainparams ))
        {
            LogPrintf("CheckBlockHeader(): Equihash solution invalid at height %d\n", pblock->nHeight);
            break;
        }

        // Check proof of work matches claimed amount
        if (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, true, chainparams.GetConsensus())) 
        {
            CBlock dumpBlock(*pblock); 
            LogPrintf("Dump block: Height %d, others ==   %s \n", pblock->nHeight, dumpBlock.ToString());
            break;
        }

        SetThreadPriority(THREAD_PRIORITY_LOWEST);
        ret = true;
    }while(0);

    return ret;
}
#endif


UniValue generateBlocks(std::shared_ptr<CReserveScript> coinbaseScript, int nGenerate, uint64_t nMaxTries, bool keepScript)
{
    static const int nInnerLoopCount = 0x10000;
    int nHeightEnd = 0;
    int nHeight = 0;
    int nCounter = 0;
    int headerlen = 0;

    {   // Don't keep cs_main locked
        LOCK(cs_main);
        nHeight = chainActive.Height();
        nHeightEnd = nHeight+nGenerate;
    }
    unsigned int nExtraNonce = 0;
    UniValue blockHashes(UniValue::VARR);
    const CChainParams& params = Params();
    unsigned int n = params.EquihashN();
    unsigned int k = params.EquihashK();

    GPUConfig conf;
    memset(&conf,0,sizeof(GPUConfig));

    conf.useGPU = gArgs.GetBoolArg("-G", false) || gArgs.GetBoolArg("-GPU", false);
    conf.selGPU = gArgs.GetArg("-deviceid", 0);
    conf.allGPU = gArgs.GetBoolArg("-allgpu", 0);
    conf.forceGenProcLimit = gArgs.GetBoolArg("-forcenolimit", false);

    uint8_t * header = NULL;
#ifdef ENABLE_GPU
    GPUSolver * g_solver = NULL;
    if( conf.useGPU )
    {        
        header = (uint8_t *) calloc(CBlockHeader::HEADER_NEWSIZE, sizeof(uint8_t));
        LogPrint(BCLog::POW, "Using Equihash solver GPU\n");
    }    
#endif

    while (nHeight < nHeightEnd)
    {

        //std::unique_ptr<CBlockTemplate> pblocktemplate(BlockAssembler(Params()).CreateNewBlock(coinbaseScript->reserveScript));
        std::unique_ptr<CBlockTemplate> pblocktemplate(BlockAssembler(Params()).CreateNewBlock(coinbaseScript->reserveScript, true, nullptr, 0, GetAdjustedTime()+POW_MINER_MAX_TIME));

        if (!pblocktemplate.get())
            throw JSONRPCError(RPC_INTERNAL_ERROR, "Couldn't create new block");
        nCounter = 0;
        CBlock *pblock = &pblocktemplate->block;
        {
            LOCK(cs_main);
            IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
        }

        n = params.EquihashN(pblock->nHeight);
        k = params.EquihashK(pblock->nHeight);

        LogPrintf("Using Equihash solver with n = %u, k = %u\n", n, k);

        if (pblock->nHeight < (uint32_t)params.GetConsensus().FABHeight)
        {
            // Solve sha256d.
            while (nMaxTries > 0 && (int)pblock->nNonce.GetUint64(0) < nInnerLoopCount &&
                   !CheckProofOfWork(pblock->GetHash(), pblock->nBits, false, Params().GetConsensus())) 
            {
                pblock->nNonce = ArithToUint256(UintToArith256(pblock->nNonce) + 1);
                --nMaxTries;
            }
            if ((int)pblock->nNonce.GetUint64(0) == nInnerLoopCount) 
                continue;
        
        } 
        else
        {
            // Solve Equihash.
            // I = the block header minus nonce and solution.
            CEquihashInput I{*pblock};
            CDataStream ss(SER_NETWORK, PROTOCOL_VERSION );
            ss << I;

            crypto_generichash_blake2b_state eh_state;
            if( conf.useGPU )
            {
#ifdef ENABLE_GPU
                memcpy(header, &ss[0], ss.size());
                if( !g_solver )
                    g_solver = new GPUSolver(conf.currentPlatform, conf.currentDevice, n, k);
#endif
            }
            else
            {
                // Solve Equihash.
                EhInitialiseState(n, k, eh_state);
                // H(I||...
                crypto_generichash_blake2b_update(&eh_state, (unsigned char*)&ss[0], ss.size());
            }

            while ( nMaxTries > 0  && nCounter < nInnerLoopCount ) 
            {
                crypto_generichash_blake2b_state curr_state;
                curr_state = eh_state;

                // Yes, there is a chance every nonce could fail to satisfy the -regtest
                // target -- 1 in 2^(2^256). That ain't gonna happen
                pblock->nNonce = ArithToUint256(UintToArith256(pblock->nNonce) + 1);
                ++nCounter;

                if( conf.useGPU )
                {
#ifdef ENABLE_GPU
                    headerlen = ((uint32_t)(nHeight+1) < (uint32_t)params.GetConsensus().ContractHeight) ? CBlockHeader::HEADER_SIZE : CBlockHeader::HEADER_NEWSIZE;
                    for (size_t i = 0; i < FABCOIN_NONCE_LEN; ++i)
                        header[ headerlen-32 + i] = pblock->nNonce.begin()[i];
#endif
                }
                else
                {
                    // H(I||V||...
                    curr_state = eh_state;
                    crypto_generichash_blake2b_update(&curr_state, pblock->nNonce.begin(), pblock->nNonce.size());
                }

                // (x_1, x_2, ...) = A(I, V, n, k)
                std::function<bool(std::vector<unsigned char>)> validBlock =
                    [&pblock](std::vector<unsigned char> soln) 
                {
                    pblock->nSolution = soln;
                    // TODO(h4x3rotab): Add metrics counter like Zcash? `solutionTargetChecks.increment();`
                    // TODO(h4x3rotab): Maybe switch to EhBasicSolve and better deal with `nMaxTries`?
                    return CheckProofOfWork(pblock->GetHash(), pblock->nBits, true, Params().GetConsensus());
                };

                bool found = false;
                if( conf.useGPU )
                {
#ifdef ENABLE_GPU
                    found = g_solver->run(n, k, header, headerlen, pblock->nNonce, validBlock, false, curr_state);
#endif
                }
                else
                    found = EhBasicSolveUncancellable(n, k, curr_state, validBlock);
                --nMaxTries;
                // TODO(h4x3rotab): Add metrics counter like Zcash? `ehSolverRuns.increment();`
                if (found) break;
            }
        }

        if (nMaxTries == 0)
            break;
        if (nCounter == nInnerLoopCount) 
            continue;

        std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
        if (!ProcessNewBlock(Params(), shared_pblock, true, nullptr))
            throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
        ++nHeight;
        blockHashes.push_back(pblock->GetHash().GetHex());

        //mark script as important because it was used at least for one coinbase output if the script came from the wallet
        if (keepScript)
        {
            coinbaseScript->KeepScript();
        }
    }

    if( conf.useGPU )
    {
#ifdef ENABLE_GPU
        delete g_solver;
        free(header);
#endif
    }

    return blockHashes;
}

UniValue generatetoaddress(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 2 || request.params.size() > 3)
        throw std::runtime_error(
            "generatetoaddress nblocks address (maxtries)\n"
            "\nMine blocks immediately to a specified address (before the RPC call returns)\n"
            "\nArguments:\n"
            "1. nblocks      (numeric, required) How many blocks are generated immediately.\n"
            "2. address      (string, required) The address to send the newly generated fabcoin to.\n"
            "3. maxtries     (numeric, optional) How many iterations to try (default = 1000000).\n"
            "\nResult:\n"
            "[ blockhashes ]     (array) hashes of blocks generated\n"
            "\nExamples:\n"
            "\nGenerate 11 blocks to myaddress\n"
            + HelpExampleCli("generatetoaddress", "11 \"myaddress\"")
        );

    if (!Params().MineBlocksOnDemand())
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "This method can only be used on regtest");

    int nGenerate = request.params[0].get_int();
    uint64_t nMaxTries = 1000000;
    if (!request.params[2].isNull()) {
        nMaxTries = request.params[2].get_int();
    }

    CFabcoinAddress address(request.params[1].get_str());
    if (!address.IsValid())
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Error: Invalid address");

    std::shared_ptr<CReserveScript> coinbaseScript = std::make_shared<CReserveScript>();
    coinbaseScript->reserveScript = GetScriptForDestination(address.Get());

    return generateBlocks(coinbaseScript, nGenerate, nMaxTries, false);
}

UniValue getmininginfo(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getmininginfo\n"
            "\nReturns a json object containing mining-related information."
            "\nResult:\n"
            "{\n"
            "  \"blocks\": nnn,             (numeric) The current block\n"
            "  \"currentblocksize\": nnn,   (numeric) The last block size\n"
            "  \"currentblockweight\": nnn, (numeric) The last block weight\n"
            "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
            "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
            "  \"errors\": \"...\"            (string) Current errors\n"
            "  \"networkhashps\": nnn,      (numeric) The network hashes per second\n"
            "  \"pooledtx\": n              (numeric) The size of the mempool\n"
            "  \"chain\": \"xxxx\",           (string) current network name as defined in BIP70 (main, test, regtest)\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmininginfo", "")
            + HelpExampleRpc("getmininginfo", "")
        );


    LOCK(cs_main);

    UniValue obj(UniValue::VOBJ);
    obj.push_back(Pair("blocks",           (int)chainActive.Height()));
    obj.push_back(Pair("currentblockweight", (uint64_t)nLastBlockWeight));
    obj.push_back(Pair("currentblocktx",   (uint64_t)nLastBlockTx));
    obj.push_back(Pair("difficulty",       (double)GetDifficulty()));
    obj.push_back(Pair("errors",           GetWarnings("statusbar")));
    obj.push_back(Pair("networkhashps",    getnetworkhashps(request)));
    obj.push_back(Pair("pooledtx",         (uint64_t)mempool.size()));
    obj.push_back(Pair("chain",            Params().NetworkIDString()));
    return obj;
}


// NOTE: Unlike wallet RPC (which use FAB values), mining RPCs follow GBT (BIP 22) in using liu amounts
UniValue prioritisetransaction(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 3)
        throw std::runtime_error(
            "prioritisetransaction <txid> <dummy value> <fee delta>\n"
            "Accepts the transaction into mined blocks at a higher (or lower) priority\n"
            "\nArguments:\n"
            "1. \"txid\"       (string, required) The transaction id.\n"
            "2. dummy          (numeric, optional) API-Compatibility for previous API. Must be zero or null.\n"
            "                  DEPRECATED. For forward compatibility use named arguments and omit this parameter.\n"
            "3. fee_delta      (numeric, required) The fee value (in liu) to add (or subtract, if negative).\n"
            "                  The fee is not actually paid, only the algorithm for selecting transactions into a block\n"
            "                  considers the transaction as it would have paid a higher (or lower) fee.\n"
            "\nResult:\n"
            "true              (boolean) Returns true\n"
            "\nExamples:\n"
            + HelpExampleCli("prioritisetransaction", "\"txid\" 0.0 10000")
            + HelpExampleRpc("prioritisetransaction", "\"txid\", 0.0, 10000")
        );

    LOCK(cs_main);

    uint256 hash = ParseHashStr(request.params[0].get_str(), "txid");
    CAmount nAmount = request.params[2].get_int64();

    if (!(request.params[1].isNull() || request.params[1].get_real() == 0)) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Priority is no longer supported, dummy argument to prioritisetransaction must be 0.");
    }

    mempool.PrioritiseTransaction(hash, nAmount);
    return true;
}


// NOTE: Assumes a conclusive result; if result is inconclusive, it must be handled by caller
static UniValue BIP22ValidationResult(const CValidationState& state)
{
    if (state.IsValid())
        return NullUniValue;

    std::string strRejectReason = state.GetRejectReason();
    if (state.IsError())
        throw JSONRPCError(RPC_VERIFY_ERROR, strRejectReason);
    if (state.IsInvalid())
    {
        if (strRejectReason.empty())
            return "rejected";
        return strRejectReason;
    }
    // Should be impossible
    return "valid?";
}

std::string gbt_vb_name(const Consensus::DeploymentPos pos) {
    const struct VBDeploymentInfo& vbinfo = VersionBitsDeploymentInfo[pos];
    std::string s = vbinfo.name;
    if (!vbinfo.gbt_force) {
        s.insert(s.begin(), '!');
    }
    return s;
}

UniValue getblocktemplate(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 1)
        throw std::runtime_error(
            "getblocktemplate ( TemplateRequest )\n"
            "\nIf the request parameters include a 'mode' key, that is used to explicitly select between the default 'template' request or a 'proposal'.\n"
            "It returns data needed to construct a block to work on.\n"
            "For full specification, see BIPs 22, 23, 9, and 145:\n"
            "    https://github.com/fabcoin/bips/blob/master/bip-0022.mediawiki\n"
            "    https://github.com/fabcoin/bips/blob/master/bip-0023.mediawiki\n"
            "    https://github.com/fabcoin/bips/blob/master/bip-0009.mediawiki#getblocktemplate_changes\n"
            "    https://github.com/fabcoin/bips/blob/master/bip-0145.mediawiki\n"

            "\nArguments:\n"
            "1. template_request         (json object, optional) A json object in the following spec\n"
            "     {\n"
            "       \"mode\":\"template\"    (string, optional) This must be set to \"template\", \"proposal | proposal_legacy \", or omitted\n"
            "       \"capabilities\":[     (array, optional) A list of strings\n"
            "           \"support\"          (string) client side supported feature, 'longpoll', 'coinbasetxn', 'coinbasevalue', 'proposal', 'serverlist', 'workid'\n"
            "           ,...\n"
            "       ],\n"
            "       \"rules\":[            (array, optional) A list of strings\n"
            "           \"support\"          (string) client side supported softfork deployment\n"
            "           ,...\n"
            "       ]\n"
            "     }\n"
            "\n"

            "\nResult:\n"
            "{\n"
            "  \"version\" : n,                    (numeric) The preferred block version\n"
            "  \"rules\" : [ \"rulename\", ... ],    (array of strings) specific block rules that are to be enforced\n"
            "  \"vbavailable\" : {                 (json object) set of pending, supported versionbit (BIP 9) softfork deployments\n"
            "      \"rulename\" : bitnumber          (numeric) identifies the bit number as indicating acceptance and readiness for the named softfork rule\n"
            "      ,...\n"
            "  },\n"
            "  \"vbrequired\" : n,                 (numeric) bit mask of versionbits the server requires set in submissions\n"
            "  \"previousblockhash\" : \"xxxx\",     (string) The hash of current highest block\n"
            "  \"transactions\" : [                (array) contents of non-coinbase transactions that should be included in the next block\n"
            "      {\n"
            "         \"data\" : \"xxxx\",             (string) transaction data encoded in hexadecimal (byte-for-byte)\n"
            "         \"txid\" : \"xxxx\",             (string) transaction id encoded in little-endian hexadecimal\n"
            "         \"hash\" : \"xxxx\",             (string) hash encoded in little-endian hexadecimal (including witness data)\n"
            "         \"depends\" : [                (array) array of numbers \n"
            "             n                          (numeric) transactions before this one (by 1-based index in 'transactions' list) that must be present in the final block if this one is\n"
            "             ,...\n"
            "         ],\n"
            "         \"fee\": n,                    (numeric) difference in value between transaction inputs and outputs (in lius); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn't one\n"
            "         \"sigops\" : n,                (numeric) total SigOps cost, as counted for purposes of block limits; if key is not present, sigop cost is unknown and clients MUST NOT assume it is zero\n"
            "         \"weight\" : n,                (numeric) total transaction weight, as counted for purposes of block limits\n"
            "         \"required\" : true|false      (boolean) if provided and true, this transaction must be in the final block\n"
            "      }\n"
            "      ,...\n"
            "  ],\n"
            "  \"coinbaseaux\" : {                 (json object) data that should be included in the coinbase's scriptSig content\n"
            "      \"flags\" : \"xx\"                  (string) key name is to be ignored, and value included in scriptSig\n"
            "  },\n"
            "  \"coinbasevalue\" : n,              (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in lius)\n"
            "  \"coinbasetxn\" : { ... },          (json object) information for coinbase transaction\n"
            "  \"target\" : \"xxxx\",                (string) The hash target\n"
            "  \"mintime\" : xxx,                  (numeric) The minimum timestamp appropriate for next block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mutable\" : [                     (array of string) list of ways the block template may be changed \n"
            "     \"value\"                          (string) A way the block template may be changed, e.g. 'time', 'transactions', 'prevblock'\n"
            "     ,...\n"
            "  ],\n"
            "  \"noncerange\" : \"00000000ffffffff\",(string) A range of valid nonces\n"
            "  \"sigoplimit\" : n,                 (numeric) limit of sigops in blocks\n"
            "  \"sizelimit\" : n,                  (numeric) limit of block size\n"
            "  \"weightlimit\" : n,                (numeric) limit of block weight\n"
            "  \"curtime\" : ttt,                  (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"bits\" : \"xxxxxxxx\",              (string) compressed target of next block\n"
            "  \"height\" : n                      (numeric) The height of the next block\n"
            "}\n"

            "\nExamples:\n"
            + HelpExampleCli("getblocktemplate", "")
            + HelpExampleRpc("getblocktemplate", "")
         );

    LOCK(cs_main);

    std::string strMode = "template";
    UniValue lpval = NullUniValue;
    std::set<std::string> setClientRules;
    int64_t nMaxVersionPreVB = -1;
    if (!request.params[0].isNull())
    {
        const UniValue& oparam = request.params[0].get_obj();
        const UniValue& modeval = find_value(oparam, "mode");
        if (modeval.isStr())
            strMode = modeval.get_str();
        else if (modeval.isNull())
        {
            /* Do nothing */
        }
        else
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
        lpval = find_value(oparam, "longpollid");

        if (strMode == "proposal" || strMode == "proposal_legacy"  )
        {
            const UniValue& dataval = find_value(oparam, "data");
            if (!dataval.isStr())
                throw JSONRPCError(RPC_TYPE_ERROR, "Missing data String key for proposal");

            CBlock block;

            if (!DecodeHexBlk(block, dataval.get_str())){
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");
            }

            uint256 hash = block.GetHash();
            BlockMap::iterator mi = mapBlockIndex.find(hash);
            if (mi != mapBlockIndex.end()) {
                CBlockIndex *pindex = mi->second;
                if (pindex->IsValid(BLOCK_VALID_SCRIPTS))
                    return "duplicate";
                if (pindex->nStatus & BLOCK_FAILED_MASK)
                    return "duplicate-invalid";
                return "duplicate-inconclusive";
            }

            CBlockIndex* const pindexPrev = chainActive.Tip();
            // TestBlockValidity only supports blocks built on the current Tip
            if (block.hashPrevBlock != pindexPrev->GetBlockHash())
                return "inconclusive-not-best-prevblk";
            if (block.nHeight != (uint32_t)pindexPrev->nHeight + 1)
                return "inconclusive-bad-height";
            CValidationState state;
            TestBlockValidity(state, Params(), block, pindexPrev, false, true);
            return BIP22ValidationResult(state);
        }

        const UniValue& aClientRules = find_value(oparam, "rules");
        if (aClientRules.isArray()) {
            for (unsigned int i = 0; i < aClientRules.size(); ++i) {
                const UniValue& v = aClientRules[i];
                setClientRules.insert(v.get_str());
            }
        } else {
            // NOTE: It is important that this NOT be read if versionbits is supported
            const UniValue& uvMaxVersion = find_value(oparam, "maxversion");
            if (uvMaxVersion.isNum()) {
                nMaxVersionPreVB = uvMaxVersion.get_int64();
            }
        }
    }

    if (strMode != "template")
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");

    if(!g_connman)
        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");

    if (g_connman->GetNodeCount(CConnman::CONNECTIONS_ALL) == 0)
        throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Fabcoin is not connected!");

    if (IsInitialBlockDownload())
        throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Fabcoin is downloading blocks...");

    static unsigned int nTransactionsUpdatedLast;

    if (!lpval.isNull())
    {
        // Wait to respond until either the best block changes, OR a minute has passed and there are more transactions
        uint256 hashWatchedChain;
        boost::system_time checktxtime;
        unsigned int nTransactionsUpdatedLastLP;

        if (lpval.isStr())
        {
            // Format: <hashBestChain><nTransactionsUpdatedLast>
            std::string lpstr = lpval.get_str();

            hashWatchedChain.SetHex(lpstr.substr(0, 64));
            nTransactionsUpdatedLastLP = atoi64(lpstr.substr(64));
        }
        else
        {
            // NOTE: Spec does not specify behaviour for non-string longpollid, but this makes testing easier
            hashWatchedChain = chainActive.Tip()->GetBlockHash();
            nTransactionsUpdatedLastLP = nTransactionsUpdatedLast;
        }

        // Release the wallet and main lock while waiting
        LEAVE_CRITICAL_SECTION(cs_main);
        {
            checktxtime = boost::get_system_time() + boost::posix_time::minutes(1);

            boost::unique_lock<boost::mutex> lock(csBestBlock);
            while (chainActive.Tip()->GetBlockHash() == hashWatchedChain && IsRPCRunning())
            {
                if (!cvBlockChange.timed_wait(lock, checktxtime))
                {
                    // Timeout: Check transactions for update
                    if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLastLP)
                        break;
                    checktxtime += boost::posix_time::seconds(10);
                }
            }
        }
        ENTER_CRITICAL_SECTION(cs_main);

        if (!IsRPCRunning())
            throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Shutting down");
        // TODO: Maybe recheck connections/IBD and (if something wrong) send an expires-immediately template to stop miners?
    }

    const struct VBDeploymentInfo& segwit_info = VersionBitsDeploymentInfo[Consensus::DEPLOYMENT_SEGWIT];
    // If the caller is indicating segwit support, then allow CreateNewBlock()
    // to select witness transactions, after segwit activates (otherwise
    // don't).
    bool fSupportsSegwit = setClientRules.find(segwit_info.name) != setClientRules.end();

    // Update block
    static CBlockIndex* pindexPrev;
    static int64_t nStart;
    static std::unique_ptr<CBlockTemplate> pblocktemplate;
    // Cache whether the last invocation was with segwit support, to avoid returning
    // a segwit-block to a non-segwit caller.
    static bool fLastTemplateSupportsSegwit = true;
    if (pindexPrev != chainActive.Tip() ||
        (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5) ||
        fLastTemplateSupportsSegwit != fSupportsSegwit)
    {
        // Clear pindexPrev so future calls make a new block, despite any failures from here on
        pindexPrev = nullptr;

        // Store the pindexBest used before CreateNewBlock, to avoid races
        nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
        CBlockIndex* pindexPrevNew = chainActive.Tip();
        nStart = GetTime();
        fLastTemplateSupportsSegwit = fSupportsSegwit;

        // Create new block
        CScript scriptDummy = CScript() << OP_TRUE;
        pblocktemplate = BlockAssembler(Params()).CreateNewBlock(scriptDummy, fSupportsSegwit);
        if (!pblocktemplate)
            throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");

        // Need to update only after we know CreateNewBlock succeeded
        pindexPrev = pindexPrevNew;
    }
    CBlock* pblock = &pblocktemplate->block; // pointer for convenience
    const Consensus::Params& consensusParams = Params().GetConsensus();

    // Update nTime
    UpdateTime(pblock, consensusParams, pindexPrev);
    pblock->nNonce = uint256();
    pblock->nSolution.clear();

    // NOTE: If at some point we support pre-segwit miners post-segwit-activation, this needs to take segwit support into consideration
    const bool fPreSegWit = !IsWitnessEnabled(pindexPrev, consensusParams); 
    
    UniValue aCaps(UniValue::VARR); aCaps.push_back("proposal");

    UniValue transactions(UniValue::VARR);
    std::map<uint256, int64_t> setTxIndex;
    int i = 0;
    for (const auto& it : pblock->vtx) {
        const CTransaction& tx = *it;
        uint256 txHash = tx.GetHash();
        setTxIndex[txHash] = i++;

        if (tx.IsCoinBase())
            continue;

        UniValue entry(UniValue::VOBJ);

        entry.push_back(Pair("data", EncodeHexTx(tx)));
        entry.push_back(Pair("txid", txHash.GetHex()));
        entry.push_back(Pair("hash", tx.GetWitnessHash().GetHex()));

        UniValue deps(UniValue::VARR);
        for (const CTxIn &in : tx.vin)
        {
            if (setTxIndex.count(in.prevout.hash))
                deps.push_back(setTxIndex[in.prevout.hash]);
        }
        entry.push_back(Pair("depends", deps));

        int index_in_template = i - 1;
        entry.push_back(Pair("fee", pblocktemplate->vTxFees[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);
    }

    UniValue aux(UniValue::VOBJ);
    aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));

    arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits);

    UniValue aMutable(UniValue::VARR);
    aMutable.push_back("time");
    aMutable.push_back("transactions");
    aMutable.push_back("prevblock");

    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("capabilities", aCaps));

    UniValue aRules(UniValue::VARR);
    UniValue vbavailable(UniValue::VOBJ);
    for (int j = 0; j < (int)Consensus::MAX_VERSION_BITS_DEPLOYMENTS; ++j) {
        Consensus::DeploymentPos pos = Consensus::DeploymentPos(j);
        ThresholdState state = VersionBitsState(pindexPrev, consensusParams, pos, versionbitscache);
        switch (state) {
            case THRESHOLD_DEFINED:
            case THRESHOLD_FAILED:
                // Not exposed to GBT at all
                break;
            case THRESHOLD_LOCKED_IN:
                // Ensure bit is set in block version
                pblock->nVersion |= VersionBitsMask(consensusParams, pos);
                // FALL THROUGH to get vbavailable set...
            case THRESHOLD_STARTED:
            {
                const struct VBDeploymentInfo& vbinfo = VersionBitsDeploymentInfo[pos];
                vbavailable.push_back(Pair(gbt_vb_name(pos), consensusParams.vDeployments[pos].bit));
                if (setClientRules.find(vbinfo.name) == setClientRules.end()) {
                    if (!vbinfo.gbt_force) {
                        // If the client doesn't support this, don't indicate it in the [default] version
                        pblock->nVersion &= ~VersionBitsMask(consensusParams, pos);
                    }
                }
                break;
            }
            case THRESHOLD_ACTIVE:
            {
                // Add to rules only
                const struct VBDeploymentInfo& vbinfo = VersionBitsDeploymentInfo[pos];
                aRules.push_back(gbt_vb_name(pos));
                if (setClientRules.find(vbinfo.name) == setClientRules.end()) {
                    // Not supported by the client; make sure it's safe to proceed
                    if (!vbinfo.gbt_force) {
                        // If we do anything other than throw an exception here, be sure version/force isn't sent to old clients
                        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Support for '%s' rule requires explicit client support", vbinfo.name));
                    }
                }
                break;
            }
        }
    }
    result.push_back(Pair("version", pblock->nVersion));
    result.push_back(Pair("rules", aRules));
    result.push_back(Pair("vbavailable", vbavailable));
    result.push_back(Pair("vbrequired", int(0)));

    if (nMaxVersionPreVB >= 2) {
        // If VB is supported by the client, nMaxVersionPreVB is -1, so we won't get here
        // Because BIP 34 changed how the generation transaction is serialized, we can only use version/force back to v2 blocks
        // This is safe to do [otherwise-]unconditionally only because we are throwing an exception above if a non-force deployment gets activated
        // Note that this can probably also be removed entirely after the first BIP9 non-force deployment (ie, probably segwit) gets activated
        aMutable.push_back("version/force");
    }
    // TODO(h4x3rotab): Return nHeight?
    result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
    result.push_back(Pair("transactions", transactions));
    result.push_back(Pair("coinbaseaux", aux));
    result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0]->vout[0].nValue));
    result.push_back(Pair("longpollid", chainActive.Tip()->GetBlockHash().GetHex() + i64tostr(nTransactionsUpdatedLast)));
    result.push_back(Pair("target", hashTarget.GetHex()));
    result.push_back(Pair("mintime", (int64_t)pindexPrev->GetMedianTimePast()+1));
    result.push_back(Pair("mutable", aMutable));
    result.push_back(Pair("noncerange", "00000000ffffffff"));
    int64_t nSigOpLimit = MAX_BLOCK_SIGOPS_COST;
    int64_t nSizeLimit = MAX_BLOCK_SERIALIZED_SIZE;
    if (fPreSegWit) {
        assert(nSigOpLimit % WITNESS_SCALE_FACTOR == 0);
        nSigOpLimit /= WITNESS_SCALE_FACTOR;
        assert(nSizeLimit % WITNESS_SCALE_FACTOR == 0);
        nSizeLimit /= WITNESS_SCALE_FACTOR;
    }
    result.push_back(Pair("sigoplimit", nSigOpLimit));
    result.push_back(Pair("sizelimit", nSizeLimit));
    if (!fPreSegWit) {
        result.push_back(Pair("weightlimit", (int64_t)MAX_BLOCK_WEIGHT));
    }
    result.push_back(Pair("curtime", pblock->GetBlockTime()));
    result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
    result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));

    if (!pblocktemplate->vchCoinbaseCommitment.empty() && fSupportsSegwit) {
        result.push_back(Pair("default_witness_commitment", HexStr(pblocktemplate->vchCoinbaseCommitment.begin(), pblocktemplate->vchCoinbaseCommitment.end())));
    }

    return result;
}

class submitblock_StateCatcher : public CValidationInterface
{
public:
    uint256 hash;
    bool found;
    CValidationState state;

    submitblock_StateCatcher(const uint256 &hashIn) : hash(hashIn), found(false), state() {}

protected:
    void BlockChecked(const CBlock& block, const CValidationState& stateIn) override {
        if (block.GetHash() != hash)
            return;
        found = true;
        state = stateIn;
    }
};

UniValue submitblock(const JSONRPCRequest& request)
{
    // We allow 2 arguments for compliance with BIP22. Argument 2 is ignored.
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4) {
        throw std::runtime_error(
            "submitblock \"hexdata\"  ( \"dummy\" )\n"
            "\nAttempts to submit new block to network.\n"
            "See https://en.fabcoin.it/wiki/BIP_0022 for full specification.\n"

            "\nArguments\n"
            "1. \"hexdata\"        (string, required) the hex-encoded block data to submit\n"
            "2. \"dummy\"          (optional) dummy value, for compatibility with BIP22. This value is ignored.\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("submitblock", "\"mydata\"")
            + HelpExampleRpc("submitblock", "\"mydata\"")
        );
    }

    std::shared_ptr<CBlock> blockptr = std::make_shared<CBlock>();
    CBlock& block = *blockptr;

    if (!DecodeHexBlk(block, request.params[0].get_str())) {
        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");
    }

    if (block.vtx.empty() || !block.vtx[0]->IsCoinBase()) {
        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block does not start with a coinbase");
    }

    uint256 hash = block.GetHash();
    bool fBlockPresent = false;
    {
        LOCK(cs_main);
        BlockMap::iterator mi = mapBlockIndex.find(hash);
        if (mi != mapBlockIndex.end()) {
            CBlockIndex *pindex = mi->second;
            if (pindex->IsValid(BLOCK_VALID_SCRIPTS)) {
                return "duplicate";
            }
            if (pindex->nStatus & BLOCK_FAILED_MASK) {
                return "duplicate-invalid";
            }
            // Otherwise, we might only have the header - process the block before returning
            fBlockPresent = true;
        }
    }

    {
        LOCK(cs_main);
        BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
        if (mi != mapBlockIndex.end()) {
            UpdateUncommittedBlockStructures(block, mi->second, Params().GetConsensus());
        }
    }

    submitblock_StateCatcher sc(block.GetHash());
    RegisterValidationInterface(&sc);
    bool fAccepted = ProcessNewBlock(Params(), blockptr, true, nullptr);
    UnregisterValidationInterface(&sc);
    if (fBlockPresent) {
        if (fAccepted && !sc.found) {
            return "duplicate-inconclusive";
        }
        return "duplicate";
    }
    if (!sc.found) {
        return "inconclusive";
    }
    return BIP22ValidationResult(sc.state);
}

UniValue getblocksubsidy(const JSONRPCRequest& request)
{
  if (request.fHelp || request.params.size() > 1)
    throw std::runtime_error(
      "getblocksubsidy height\n"
      "\nReturns block subsidy reward of block at index provided.\n"
      "\nArguments:\n"
      "1. height          (numeric, optional) The block height. If not provided, defaults to the current height of the chain.\n"
      "\nResult:\n"
      "{\n"
      "\"miner\": n,    (numeric) The mining reward amount in lius.\n"
      "\"founders\": f, (numeric) Always 0, for Zcash mining compatibility.\n"
      "}\n"
      "\nExamples:\n"
      + HelpExampleCli("getblocksubsidy", "1000")
      + HelpExampleRpc("getblocksubsidy", "1000")
    );

  RPCTypeCheck(request.params, {UniValue::VNUM});

  LOCK(cs_main);
  int nHeight = (request.params.size() == 1) ? request.params[0].get_int() : chainActive.Height();
  if (nHeight < 0)
    throw JSONRPCError(RPC_INVALID_PARAMETER, "Block height out of range.");

  UniValue result(UniValue::VOBJ);

  CAmount nReward = GetBlockSubsidy(nHeight, Params().GetConsensus());
  result.push_back(Pair("miner", nReward));
  result.push_back(Pair("founders", 0));

  return result;
}

UniValue estimatefee(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "estimatefee nblocks\n"
            "\nDEPRECATED. Please use estimatesmartfee for more intelligent estimates."
            "\nEstimates the approximate fee per kilobyte needed for a transaction to begin\n"
            "confirmation within nblocks blocks. Uses virtual transaction size of transaction\n"
            "as defined in BIP 141 (witness data is discounted).\n"
            "\nArguments:\n"
            "1. nblocks     (numeric, required)\n"
            "\nResult:\n"
            "n              (numeric) estimated fee-per-kilobyte\n"
            "\n"
            "A negative value is returned if not enough transactions and blocks\n"
            "have been observed to make an estimate.\n"
            "-1 is always returned for nblocks == 1 as it is impossible to calculate\n"
            "a fee that is high enough to get reliably included in the next block.\n"
            "\nExample:\n"
            + HelpExampleCli("estimatefee", "6")
            );

    RPCTypeCheck(request.params, {UniValue::VNUM});

    int nBlocks = request.params[0].get_int();
    if (nBlocks < 1)
        nBlocks = 1;

    CFeeRate feeRate = ::feeEstimator.estimateFee(nBlocks);
    if (feeRate == CFeeRate(0))
        return -1.0;

    return ValueFromAmount(feeRate.GetFeePerK());
}

UniValue estimatesmartfee(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "estimatesmartfee conf_target (\"estimate_mode\")\n"
            "\nEstimates the approximate fee per kilobyte needed for a transaction to begin\n"
            "confirmation within conf_target blocks if possible and return the number of blocks\n"
            "for which the estimate is valid. Uses virtual transaction size as defined\n"
            "in BIP 141 (witness data is discounted).\n"
            "\nArguments:\n"
            "1. conf_target     (numeric) Confirmation target in blocks (1 - 1008)\n"
            "2. \"estimate_mode\" (string, optional, default=CONSERVATIVE) The fee estimate mode.\n"
            "                   Whether to return a more conservative estimate which also satisfies\n"
            "                   a longer history. A conservative estimate potentially returns a\n"
            "                   higher feerate and is more likely to be sufficient for the desired\n"
            "                   target, but is not as responsive to short term drops in the\n"
            "                   prevailing fee market.  Must be one of:\n"
            "       \"UNSET\" (defaults to CONSERVATIVE)\n"
            "       \"ECONOMICAL\"\n"
            "       \"CONSERVATIVE\"\n"
            "\nResult:\n"
            "{\n"
            "  \"feerate\" : x.x,     (numeric, optional) estimate fee-per-kilobyte (in FAB)\n"
            "  \"errors\": [ str... ] (json array of strings, optional) Errors encountered during processing\n"
            "  \"blocks\" : n         (numeric) block number where estimate was found\n"
            "}\n"
            "\n"
            "The request target will be clamped between 2 and the highest target\n"
            "fee estimation is able to return based on how long it has been running.\n"
            "An error is returned if not enough transactions and blocks\n"
            "have been observed to make an estimate for any number of blocks.\n"
            "\nExample:\n"
            + HelpExampleCli("estimatesmartfee", "6")
            );

    RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VSTR});
    RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
    unsigned int conf_target = ParseConfirmTarget(request.params[0]);
    bool conservative = true;
    if (request.params.size() > 1 && !request.params[1].isNull()) {
        FeeEstimateMode fee_mode;
        if (!FeeModeFromString(request.params[1].get_str(), fee_mode)) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid estimate_mode parameter");
        }
        if (fee_mode == FeeEstimateMode::ECONOMICAL) conservative = false;
    }

    UniValue result(UniValue::VOBJ);
    UniValue errors(UniValue::VARR);
    FeeCalculation feeCalc;
    CFeeRate feeRate = ::feeEstimator.estimateSmartFee(conf_target, &feeCalc, conservative);
    if (feeRate != CFeeRate(0)) {
        result.push_back(Pair("feerate", ValueFromAmount(feeRate.GetFeePerK())));
    } else {
        errors.push_back("Insufficient data or no feerate found");
        result.push_back(Pair("errors", errors));
    }
    result.push_back(Pair("blocks", feeCalc.returnedTarget));
    return result;
}

UniValue estimaterawfee(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "estimaterawfee conf_target (threshold)\n"
            "\nWARNING: This interface is unstable and may disappear or change!\n"
            "\nWARNING: This is an advanced API call that is tightly coupled to the specific\n"
            "         implementation of fee estimation. The parameters it can be called with\n"
            "         and the results it returns will change if the internal implementation changes.\n"
            "\nEstimates the approximate fee per kilobyte needed for a transaction to begin\n"
            "confirmation within conf_target blocks if possible. Uses virtual transaction size as\n"
            "defined in BIP 141 (witness data is discounted).\n"
            "\nArguments:\n"
            "1. conf_target (numeric) Confirmation target in blocks (1 - 1008)\n"
            "2. threshold   (numeric, optional) The proportion of transactions in a given feerate range that must have been\n"
            "               confirmed within conf_target in order to consider those feerates as high enough and proceed to check\n"
            "               lower buckets.  Default: 0.95\n"
            "\nResult:\n"
            "{\n"
            "  \"short\" : {            (json object, optional) estimate for short time horizon\n"
            "      \"feerate\" : x.x,        (numeric, optional) estimate fee-per-kilobyte (in FAB)\n"
            "      \"decay\" : x.x,          (numeric) exponential decay (per block) for historical moving average of confirmation data\n"
            "      \"scale\" : x,            (numeric) The resolution of confirmation targets at this time horizon\n"
            "      \"pass\" : {              (json object, optional) information about the lowest range of feerates to succeed in meeting the threshold\n"
            "          \"startrange\" : x.x,     (numeric) start of feerate range\n"
            "          \"endrange\" : x.x,       (numeric) end of feerate range\n"
            "          \"withintarget\" : x.x,   (numeric) number of txs over history horizon in the feerate range that were confirmed within target\n"
            "          \"totalconfirmed\" : x.x, (numeric) number of txs over history horizon in the feerate range that were confirmed at any point\n"
            "          \"inmempool\" : x.x,      (numeric) current number of txs in mempool in the feerate range unconfirmed for at least target blocks\n"
            "          \"leftmempool\" : x.x,    (numeric) number of txs over history horizon in the feerate range that left mempool unconfirmed after target\n"
            "      },\n"
            "      \"fail\" : { ... },       (json object, optional) information about the highest range of feerates to fail to meet the threshold\n"
            "      \"errors\":  [ str... ]   (json array of strings, optional) Errors encountered during processing\n"
            "  },\n"
            "  \"medium\" : { ... },    (json object, optional) estimate for medium time horizon\n"
            "  \"long\" : { ... }       (json object) estimate for long time horizon\n"
            "}\n"
            "\n"
            "Results are returned for any horizon which tracks blocks up to the confirmation target.\n"
            "\nExample:\n"
            + HelpExampleCli("estimaterawfee", "6 0.9")
            );

    RPCTypeCheck(request.params, {UniValue::VNUM, UniValue::VNUM}, true);
    RPCTypeCheckArgument(request.params[0], UniValue::VNUM);
    unsigned int conf_target = ParseConfirmTarget(request.params[0]);
    double threshold = 0.95;
    if (!request.params[1].isNull()) {
        threshold = request.params[1].get_real();
    }
    if (threshold < 0 || threshold > 1) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid threshold");
    }

    UniValue result(UniValue::VOBJ);

    for (FeeEstimateHorizon horizon : {FeeEstimateHorizon::SHORT_HALFLIFE, FeeEstimateHorizon::MED_HALFLIFE, FeeEstimateHorizon::LONG_HALFLIFE}) {
        CFeeRate feeRate;
        EstimationResult buckets;

        // Only output results for horizons which track the target
        if (conf_target > ::feeEstimator.HighestTargetTracked(horizon)) continue;

        feeRate = ::feeEstimator.estimateRawFee(conf_target, threshold, horizon, &buckets);
        UniValue horizon_result(UniValue::VOBJ);
        UniValue errors(UniValue::VARR);
        UniValue passbucket(UniValue::VOBJ);
        passbucket.push_back(Pair("startrange", round(buckets.pass.start)));
        passbucket.push_back(Pair("endrange", round(buckets.pass.end)));
        passbucket.push_back(Pair("withintarget", round(buckets.pass.withinTarget * 100.0) / 100.0));
        passbucket.push_back(Pair("totalconfirmed", round(buckets.pass.totalConfirmed * 100.0) / 100.0));
        passbucket.push_back(Pair("inmempool", round(buckets.pass.inMempool * 100.0) / 100.0));
        passbucket.push_back(Pair("leftmempool", round(buckets.pass.leftMempool * 100.0) / 100.0));
        UniValue failbucket(UniValue::VOBJ);
        failbucket.push_back(Pair("startrange", round(buckets.fail.start)));
        failbucket.push_back(Pair("endrange", round(buckets.fail.end)));
        failbucket.push_back(Pair("withintarget", round(buckets.fail.withinTarget * 100.0) / 100.0));
        failbucket.push_back(Pair("totalconfirmed", round(buckets.fail.totalConfirmed * 100.0) / 100.0));
        failbucket.push_back(Pair("inmempool", round(buckets.fail.inMempool * 100.0) / 100.0));
        failbucket.push_back(Pair("leftmempool", round(buckets.fail.leftMempool * 100.0) / 100.0));

        // CFeeRate(0) is used to indicate error as a return value from estimateRawFee
        if (feeRate != CFeeRate(0)) {
            horizon_result.push_back(Pair("feerate", ValueFromAmount(feeRate.GetFeePerK())));
            horizon_result.push_back(Pair("decay", buckets.decay));
            horizon_result.push_back(Pair("scale", (int)buckets.scale));
            horizon_result.push_back(Pair("pass", passbucket));
            // buckets.fail.start == -1 indicates that all buckets passed, there is no fail bucket to output
            if (buckets.fail.start != -1) horizon_result.push_back(Pair("fail", failbucket));
        } else {
            // Output only information that is still meaningful in the event of error
            horizon_result.push_back(Pair("decay", buckets.decay));
            horizon_result.push_back(Pair("scale", (int)buckets.scale));
            horizon_result.push_back(Pair("fail", failbucket));
            errors.push_back("Insufficient data or no feerate found which meets threshold");
            horizon_result.push_back(Pair("errors",errors));
        }
        result.push_back(Pair(StringForFeeEstimateHorizon(horizon), horizon_result));
    }
    return result;
}

UniValue getgenerate(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
        "getgenerate\n"
        "\nReturn if the server is set to generate coins or not. The default is false.\n"
        "It is set with the command line argument -gen (or " + std::string(FABCOIN_CONF_FILENAME) + " setting gen)\n"
        "It can also be set with the setgenerate call.\n"
        "\nResult\n"
        "true|false      (boolean) If the server is set to generate coins or not\n"
        "\nExamples:\n"
        + HelpExampleCli("getgenerate", "")
        + HelpExampleRpc("getgenerate", "")
        );

    LOCK(cs_main);
    return gArgs.GetBoolArg("-gen", DEFAULT_GENERATE);
}

UniValue setgenerate(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
        "setgenerate generate ( genproclimit )\n"
        "\nSet 'generate' true or false to turn generation on or off.\n"
        "Generation is limited to 'genproclimit' processors, -1 is unlimited.\n"
        "See the getgenerate call for the current setting.\n"
        "\nArguments:\n"
        "1. generate         (boolean, required) Set to true to turn on generation, off to turn off.\n"
        "2. genproclimit     (numeric, optional) Set the processor limit for when generation is on. Can be -1 for unlimited.\n"
        "\nExamples:\n"
        "\nSet the generation on with a limit of one processor\n"
        + HelpExampleCli("setgenerate", "true 1") +
        "\nCheck the setting\n"
        + HelpExampleCli("getgenerate", "") +
        "\nTurn off generation\n"
        + HelpExampleCli("setgenerate", "false") +
        "\nUsing json rpc\n"
        + HelpExampleRpc("setgenerate", "true, 1")
        );

    if (Params().MineBlocksOnDemand())
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Use the generate method instead of setgenerate on this network");

    bool fGenerate = true;
    if (request.params.size() > 0)
        fGenerate = request.params[0].get_bool();

    int nGenProcLimit = 1;
    if (request.params.size() > 1)
    {
        nGenProcLimit = request.params[1].get_int();
        if (nGenProcLimit == 0)
            fGenerate = false;
    }

    gArgs.ForceSetArg("-gen",fGenerate ? "1" : "0");
    gArgs.ForceSetArg("-genproclimit",itostr(nGenProcLimit));
    GenerateFabcoins(fGenerate, nGenProcLimit, Params());

    GPUConfig conf;
    conf.useGPU = gArgs.GetBoolArg("-G", false) || gArgs.GetBoolArg("-GPU", false);
    conf.selGPU = gArgs.GetArg("-deviceid", 0);
    conf.allGPU = gArgs.GetBoolArg("-allgpu", 0);
    conf.forceGenProcLimit = gArgs.GetBoolArg("-forcenolimit", false);
    GenerateFabcoins(fGenerate, nGenProcLimit, Params(), conf);

    return 0;
}


static const CRPCCommand commands[] =
{ //  category              name                      actor (function)         okSafeMode
  //  --------------------- ------------------------  -----------------------  ----------
    { "mining",             "getnetworkhashps",       &getnetworkhashps,       true,  {"nblocks","height"} },
    { "mining",             "getmininginfo",          &getmininginfo,          true,  {} },
    { "mining",             "prioritisetransaction",  &prioritisetransaction,  true,  {"txid","dummy","fee_delta"} },
    { "mining",             "getblocktemplate",       &getblocktemplate,       true,  {"template_request"} },
    { "mining",             "submitblock",            &submitblock,            true,  {"hexdata","dummy"} },
    { "mining",             "getblocksubsidy",        &getblocksubsidy,        true,  {"height"} },

    { "generating",         "generatetoaddress",      &generatetoaddress,      true,  {"nblocks","address","maxtries"} },
    { "generating",         "getgenerate",            &getgenerate,            true,  {"generate","genproclimit"} },
    { "generating",         "setgenerate",            &setgenerate,            true,  {"generate"} },

    { "util",               "estimatefee",            &estimatefee,            true,  {"nblocks"} },
    { "util",               "estimatesmartfee",       &estimatesmartfee,       true,  {"conf_target", "estimate_mode"} },

    { "hidden",             "estimaterawfee",         &estimaterawfee,         true,  {"conf_target", "threshold"} },
};

void RegisterMiningRPCCommands(CRPCTable &t)
{
    for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
        t.appendCommand(commands[vcidx].name, &commands[vcidx]);
}