mining.cpp

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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2014-2015 The Dash developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2020 The DAPS Project developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "amount.h"
#include "base58.h"
#include "chainparams.h"
#include "core_io.h"
#include "init.h"
#include "main.h"
#include "miner.h"
#include "net.h"
#include "poa.h"
#include "rpc/server.h"
#include "util.h"
#ifdef ENABLE_WALLET
#include "wallet/db.h"
#include "wallet/wallet.h"
#endif
 
#include <stdint.h>
 
#include <boost/assign/list_of.hpp>
 
#include <univalue.h>
 
 
static uint256 PoAMerkleRoot;
 
UniValue GetNetworkHashPS(int lookup, int height)
{
    CBlockIndex *pb = chainActive.Tip();
 
    if (height >= 0 && height < chainActive.Height())
        pb = chainActive[height];
 
    if (pb == NULL || !pb->nHeight)
        return 0;
 
    // If lookup is -1, then use blocks since last difficulty change.
    if (lookup <= 0)
        lookup = pb->nHeight % 2016 + 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;
 
    uint256 workDiff = pb->nChainWork - pb0->nChainWork;
    int64_t timeDiff = maxTime - minTime;
 
    return (int64_t)(workDiff.getdouble() / timeDiff);
}
 
UniValue getnetworkhashps(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() > 2)
        throw std::runtime_error(
            "getnetworkhashps ( blocks 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. blocks     (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(params.size() > 0 ? params[0].get_int() : 120, params.size() > 1 ? params[1].get_int() : -1);
}
 
#ifdef ENABLE_WALLET
UniValue getgenerate(const UniValue& params, bool fHelp)
{
    if (fHelp || 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 prcycoin.conf 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 GetBoolArg("-gen", false);
}
 
UniValue generate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() < 1 || params.size() > 1)
        throw std::runtime_error(
            "generate numblocks\n"
            "\nMine blocks immediately (before the RPC call returns)\n"
            "\nNote: this function can only be used on the regtest network\n"
 
            "\nArguments:\n"
            "1. numblocks    (numeric, required) How many blocks to generate.\n"
 
            "\nResult\n"
            "[ blockhashes ]     (array) hashes of blocks generated\n"
 
            "\nExamples:\n"
            "\nGenerate 11 blocks\n"
            + HelpExampleCli("generate", "11")
        );
 
    if (!Params().MineBlocksOnDemand())
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "This method can only be used on regtest");
 
    int nHeightStart = 0;
    int nHeightEnd = 0;
    int nHeight = 0;
    int nGenerate = params[0].get_int();
    CReserveKey reservekey(pwalletMain);
 
    {   // Don't keep cs_main locked
        LOCK(cs_main);
        nHeightStart = chainActive.Height();
        nHeight = nHeightStart;
        nHeightEnd = nHeightStart+nGenerate;
    }
    unsigned int nExtraNonce = 0;
    UniValue blockHashes(UniValue::VARR);
    bool fPoS = nHeight >= Params().LAST_POW_BLOCK();
    while (nHeight < nHeightEnd)
    {
        std::unique_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pwalletMain, fPoS));
        if (!pblocktemplate.get())
            throw JSONRPCError(RPC_INTERNAL_ERROR, "Couldn't create new block");
        CBlock *pblock = &pblocktemplate->block;
        if(!fPoS){
            {
                LOCK(cs_main);
                IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
            }
        }
        while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits)) {
            // Yes, there is a chance every nonce could fail to satisfy the -regtest
            // target -- 1 in 2^(2^32). That ain't gonna happen.
            ++pblock->nNonce;
        }
        CValidationState state;
        if (!ProcessNewBlock(state, NULL, pblock))
            throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
        ++nHeight;
        fPoS = nHeight >= Params().LAST_POW_BLOCK();
        blockHashes.push_back(pblock->GetHash().GetHex());
    }
    return blockHashes;
}
 
UniValue setgenerate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() < 1 || 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, false 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 (pwalletMain == NULL)
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");
 
    if (Params().MineBlocksOnDemand())
        throw JSONRPCError(RPC_INVALID_REQUEST, "Use the generate method instead of setgenerate on this network");
 
    bool fGenerate = true;
    if (params.size() > 0)
        fGenerate = params[0].get_bool();
 
    int nGenProcLimit = -1;
    if (params.size() > 1) {
        nGenProcLimit = params[1].get_int();
        if (nGenProcLimit == 0)
            fGenerate = false;
    }
        pwalletMain->WriteStakingStatus(fGenerate);
    mapArgs["-gen"] = (fGenerate ? "1" : "0");
    mapArgs["-genproclimit"] = itostr(nGenProcLimit);
    pwalletMain->combineMode = CombineMode::ON;
    GeneratePrcycoins(fGenerate, pwalletMain, nGenProcLimit);
 
    return "Done";
}
 
 
UniValue generatepoa(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw std::runtime_error(
            "generatepoa generate PoA blocks ( genproclimit )\n"
            "\nArguments:\n"
            "1. period     (numeric, optional) Set the interval for creating a poa block \n"
            "                    Note: in -regtest mode, period is not needed, one poa block can be generated on demand.\n"
            "\nResult\n"
            "blockhash     (-regtest only) hash of generated poa block\n"
            "\nExamples:\n"
            "\nSet generate a poa block every 30 minutes\n" +
            HelpExampleCli("generatepoa", "30") +
            "\nCheck the setting\n" + HelpExampleCli("getgenerate", "") +
            "\nTurn off generation\n" + HelpExampleCli("generatepoa", "0") +
            "\nUsing json rpc\n" + HelpExampleRpc("generatepoa", "30"));
 
 
    if (pwalletMain == NULL)
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");
 
    // We need this here as CreateNewPoABlockWithKey requires unlocked wallet to GenerateAddress
    EnsureWalletIsUnlocked();
 
    int period = 60;//default value
    if (params.size() > 1) {
        period = params[1].get_int();
    }
 
    // don't return until a poa block is successfully generated and added to the chain
    int nHeightStart = 0;
    int nHeightEnd = 0;
    int nHeight = 0;
    int nGenerate = 1;
    CReserveKey reservekey(pwalletMain);
 
    { // Don't keep cs_main locked
        LOCK(cs_main);
        nHeightStart = chainActive.Height();
        nHeight = nHeightStart;
        nHeightEnd = nHeightStart + nGenerate;
    }
 
    unsigned int nExtraNonce = 0;
 
    UniValue blockHashes(UniValue::VARR);
 
    bool createPoABlock = false;
    if (nHeight >= Params().LAST_POW_BLOCK()) {
        createPoABlock = true;
    }
 
    if (!createPoABlock) {
        return NullUniValue;
    }
 
    std::unique_ptr<CBlockTemplate> pblocktemplate(CreateNewPoABlockWithKey(reservekey, pwalletMain));
    if (!pblocktemplate.get())
        throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet keypool empty");
    CBlock* pblock = &pblocktemplate->block;
 
    CValidationState state;
    if (!ProcessNewBlock(state, NULL, pblock))
        throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
    ++nHeight;
    blockHashes.push_back(pblock->GetHash().GetHex());
    return blockHashes;
}
 
UniValue gethashespersec(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 0)
        throw std::runtime_error(
            "gethashespersec\n"
            "\nReturns a recent hashes per second performance measurement while generating.\n"
            "See the getgenerate and setgenerate calls to turn generation on and off.\n"
            "\nResult:\n"
            "n            (numeric) The recent hashes per second when generation is on (will return 0 if generation is off)\n"
            "\nExamples:\n" +
            HelpExampleCli("gethashespersec", "") + HelpExampleRpc("gethashespersec", ""));
 
    if (GetTimeMillis() - nHPSTimerStart > 8000)
        return (int64_t)0;
    return (int64_t)dHashesPerSec;
}
#endif
 
 
UniValue getmininginfo(const UniValue& params, bool fHelp)
{
    if (fHelp || 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"
            "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
            "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
            "  \"errors\": \"...\"          (string) Current errors\n"
            "  \"generate\": true|false     (boolean) If the generation is on or off (see getgenerate or setgenerate calls)\n"
            "  \"genproclimit\": n          (numeric) The processor limit for generation. -1 if no generation. (see getgenerate or setgenerate calls)\n"
            "  \"hashespersec\": n          (numeric) The hashes per second of the generation, or 0 if no generation.\n"
            "  \"pooledtx\": n              (numeric) The size of the mem pool\n"
            "  \"testnet\": true|false      (boolean) If using testnet or not\n"
            "  \"chain\": \"xxxx\",         (string) current network name (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("currentblocksize", (uint64_t)nLastBlockSize));
    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("genproclimit", (int)GetArg("-genproclimit", -1)));
    obj.push_back(Pair("networkhashps", getnetworkhashps(params, false)));
    obj.push_back(Pair("pooledtx", (uint64_t)mempool.size()));
    obj.push_back(Pair("testnet", Params().TestnetToBeDeprecatedFieldRPC()));
    obj.push_back(Pair("chain", Params().NetworkIDString()));
#ifdef ENABLE_WALLET
    obj.push_back(Pair("generate", getgenerate(params, false)));
    obj.push_back(Pair("hashespersec", gethashespersec(params, false)));
#endif
    return obj;
}
 
 
// NOTE: Unlike wallet RPC (which use BTC values), mining RPCs follow GBT (BIP 22) in using satoshi amounts
UniValue prioritisetransaction(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 3)
        throw std::runtime_error(
            "prioritisetransaction <txid> <priority delta> <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. priority delta (numeric, required) The priority to add or subtract.\n"
            "                  The transaction selection algorithm considers the tx as it would have a higher priority.\n"
            "                  (priority of a transaction is calculated: coinage * value_in_duffs / txsize) \n"
            "3. fee delta      (numeric, required) The fee value (in duffs) 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(params[0].get_str(), "txid");
 
    CAmount nAmount = params[2].get_int64();
 
    mempool.PrioritiseTransaction(hash, params[0].get_str(), params[1].get_real(), 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?";
}
 
UniValue getblocktemplate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() > 1)
        throw std::runtime_error(
            "getblocktemplate ( \"jsonrequestobject\" )\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"
            "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.\n"
 
            "\nArguments:\n"
            "1. \"jsonrequestobject\"       (string, optional) A json object in the following spec\n"
            "     {\n"
            "       \"mode\":\"template\"    (string, optional) This must be set to \"template\" 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"
            "     }\n"
            "\n"
 
            "\nResult:\n"
            "{\n"
            "  \"version\" : n,                    (numeric) The block version\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"
            "         \"hash\" : \"xxxx\",          (string) hash/id encoded in little-endian hexadecimal\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 duffs); 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 number of SigOps, as counted for purposes of block limits; if key is not present, sigop count is unknown and clients MUST NOT assume there aren't any\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\" : \"flags\"            (string) \n"
            "  },\n"
            "  \"coinbasevalue\" : n,               (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in duffs)\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"
            "  \"curtime\" : ttt,                  (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"bits\" : \"xxx\",                 (string) compressed target of next block\n"
            "  \"height\" : n                      (numeric) The height of the next block\n"
            "  \"payee\" : \"xxx\",                (string) required payee for the next block\n"
            "  \"payee_amount\" : n,               (numeric) required amount to pay\n"
            "  \"votes\" : [\n                     (array) show vote candidates\n"
            "        { ... }                       (json object) vote candidate\n"
            "        ,...\n"
            "  ],\n"
            "  \"masternode_payments\" : true|false,         (boolean) true, if masternode payments are enabled\n"
            "  \"enforce_masternode_payments\" : true|false  (boolean) true, if masternode payments are enforced\n"
            "}\n"
 
            "\nExamples:\n" +
            HelpExampleCli("getblocktemplate", "") + HelpExampleRpc("getblocktemplate", ""));
 
    LOCK(cs_main);
 
    std::string strMode = "template";
    UniValue lpval = NullUniValue;
    if (params.size() > 0) {
        const UniValue& oparam = 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") {
            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";
            CValidationState state;
            TestBlockValidity(state, block, pindexPrev, false, true);
            return BIP22ValidationResult(state);
        }
    }
 
    if (strMode != "template")
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
 
    if (vNodes.empty())
        throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "PRCY is not connected!");
 
    if (IsInitialBlockDownload())
        throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "PRCY 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;
        std::chrono::steady_clock::time_point 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 = std::chrono::steady_clock::now() + std::chrono::minutes(1);
 
            WAIT_LOCK(g_best_block_mutex, lock);
            while (g_best_block == hashWatchedChain && IsRPCRunning()) {
                if (g_best_block_cv.wait_until(lock, checktxtime) == std::cv_status::timeout)
                {
                    // Timeout: Check transactions for update
                    if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLastLP)
                        break;
                    checktxtime += std::chrono::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?
    }
 
    // Update block
    static CBlockIndex* pindexPrev;
    static int64_t nStart;
    static CBlockTemplate* pblocktemplate;
    if (pindexPrev != chainActive.Tip() ||
        (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5)) {
        // Clear pindexPrev so future calls make a new block, despite any failures from here on
        pindexPrev = NULL;
 
        // Store the chainActive.Tip() used before CreateNewBlock, to avoid races
        nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
        CBlockIndex* pindexPrevNew = chainActive.Tip();
        nStart = GetTime();
 
        // Create new block
        if (pblocktemplate) {
            delete pblocktemplate;
            pblocktemplate = NULL;
        }
        CPubKey des, txPub;
        CKey txPriv;
        if (!pwalletMain->GenerateAddress(des, txPub, txPriv)) {
            throw std::runtime_error("Wallet is locked, please unlock it");
        }
        CScript scriptDummy = CScript() << OP_TRUE;
        pblocktemplate = CreateNewBlock(scriptDummy, txPub, txPriv, pwalletMain, false);
        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
 
    // Update nTime
    UpdateTime(pblock, pindexPrev);
    pblock->nNonce = 0;
 
    UniValue aCaps(UniValue::VARR); aCaps.push_back("proposal");
 
    UniValue transactions(UniValue::VARR);
    std::map<uint256, int64_t> setTxIndex;
    int i = 0;
    for (CTransaction& tx : pblock->vtx) {
        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("hash", txHash.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]));
        entry.push_back(Pair("sigops", pblocktemplate->vTxSigOps[index_in_template]));
 
        transactions.push_back(entry);
    }
 
    UniValue aux(UniValue::VOBJ);
    aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
 
    uint256 hashTarget = uint256().SetCompact(pblock->nBits);
 
    static UniValue aMutable(UniValue::VARR);
    if (aMutable.empty()) {
        aMutable.push_back("time");
        aMutable.push_back("transactions");
        aMutable.push_back("prevblock");
    }
 
    UniValue aVotes(UniValue::VARR);
 
    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("capabilities", aCaps));
    result.push_back(Pair("version", pblock->nVersion));
    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].GetValueOut()));
    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"));
    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)));
    result.push_back(Pair("votes", aVotes));
 
 
    if (pblock->payee != CScript()) {
        CTxDestination address1;
        ExtractDestination(pblock->payee, address1);
        CBitcoinAddress address2(address1);
        result.push_back(Pair("payee", address2.ToString().c_str()));
        result.push_back(Pair("payee_amount", (int64_t)pblock->vtx[0].vout[1].nValue));
    } else {
        result.push_back(Pair("payee", ""));
        result.push_back(Pair("payee_amount", ""));
    }
 
    result.push_back(Pair("masternode_payments", pblock->nTime > Params().StartMasternodePayments()));
    result.push_back(Pair("enforce_masternode_payments", true));
 
    return result;
}
 
UniValue getpoablocktemplate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() > 0)
        throw std::runtime_error(
                "getpoablocktemplate\n"
                "It returns data needed to construct a block to work on.\n"
 
                "\nArguments:\n"
 
                "\nResult:\n"
                "{\n"
                "  \"version\" : n,                    (numeric) The block version\n"
                "  \"previouspoablockhash\" : \"xxxx\",    (string) The hash of current highest block\n"
                "  \"poamerkleroot\" : \"xxxx\",    (string) The PoA merkle root\n"
                "  \"poahashintegrated\" : \"xxxx\",    (string) hash of previouspoablockhash and poamerkleroot\n"
                "  \"coinbasevalue\" : n,               (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in duffs)\n"
                "  \"coinbasetxn\" : { ... },           (json object) information for coinbase transaction\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"
                "  \"curtime\" : ttt,                  (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
                "  \"bits\" : \"xxx\",                 (string) compressed target of next block\n"
                "  \"payee\" : \"xxx\",                (string) required payee for the next block\n"
                "  \"payee_amount\" : n,               (numeric) required amount to pay\n"
                "  \"posblocksaudited\" : [                (array) summaries of PoS blocks that should be included in the next PoA block\n"
                "      {\n"
                "         \"hash\" : \"xxxx\",          (string) block hash\n"
                "         \"height\" : xxxx,          (numeric) block height\n"
                "         \"time\": xxxx,               (numeric) timestamp \n"
                "      }\n"
                "      ,...\n"
                "  ],\n"
                "  \"masternode_payments\" : true|false,         (boolean) true, if masternode payments are enabled\n"
                "  \"enforce_masternode_payments\" : true|false  (boolean) true, if masternode payments are enforced\n"
                "}\n"
 
                "\nExamples:\n" +
                HelpExampleCli("getpoablocktemplate", "") + HelpExampleRpc("getpoablocktemplate", ""));
 
    // We need this here as CreateNewPoABlockWithKey requires unlocked wallet to GenerateAddress
    EnsureWalletIsUnlocked();
 
    LOCK(cs_main);
 
    {
        std::string strMode = "template";
        UniValue lpval = NullUniValue;
 
        if (strMode != "template")
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
 
        if (vNodes.empty())
            throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "PRCY is not connected!");
 
        if (IsInitialBlockDownload())
            throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "PRCY is downloading blocks...");
 
        // Update block
        static CBlockIndex* pindexPrev;
        static int64_t nStart;
        static CBlockTemplate* pblocktemplate;
        if (pindexPrev != chainActive.Tip()) {
            // Clear pindexPrev so future calls make a new block, despite any failures from here on
            pindexPrev = NULL;
 
            // Store the chainActive.Tip() used before CreateNewBlock, to avoid races
            CBlockIndex* pindexPrevNew = chainActive.Tip();
            nStart = GetTime();
 
            // Create new block
            if (pblocktemplate) {
                delete pblocktemplate;
                pblocktemplate = NULL;
            }
            CReserveKey reservekey(pwalletMain);
            pblocktemplate = CreateNewPoABlockWithKey(reservekey, pwalletMain);
            if (!pblocktemplate)
                throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
 
            // Need to update only after we know CreateNewPoABlock succeeded
            pindexPrev = pindexPrevNew;
        }
        CBlock* pblock = &pblocktemplate->block; // pointer for convenience
 
        // Update nTime: I don't think time is necessary for PoA miners here
        UpdateTime(pblock, pindexPrev);
        pblock->nNonce = 0;
 
        UniValue aCaps = NullUniValue;
    //    static const Array aCaps = boost::assign::list_of("proposal");
 
        UniValue transactions(UniValue::VARR);
        std::map<uint256, int64_t> setTxIndex;
        int i = 0;
        for (CTransaction& tx : pblock->vtx) {
            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("hash", txHash.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]));
            entry.push_back(Pair("sigops", pblocktemplate->vTxSigOps[index_in_template]));
 
            transactions.push_back(entry);
        }
 
        UniValue coinbasetxn(UniValue::VOBJ);
        CTransaction& tx = pblock->vtx[0];
        coinbasetxn.push_back(Pair("data", EncodeHexTx(tx)));
        coinbasetxn.push_back(Pair("hash", tx.GetHash().GetHex()));
 
        UniValue aux(UniValue::VOBJ);
        aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
 
        UniValue aMutable(UniValue::VARR);
        if (aMutable.empty()) {
            aMutable.push_back("time");
            aMutable.push_back("transactions");
            aMutable.push_back("prevblock");
        }
 
        //Information about PoS blocks to be audited
        UniValue posBlocksAudited(UniValue::VARR);
        for (size_t idx = 0; idx < pblock->posBlocksAudited.size(); idx++) {
            UniValue entry(UniValue::VOBJ);
            PoSBlockSummary pos = pblock->posBlocksAudited.at(idx);
            entry.push_back(Pair("data", EncodeHexPoSBlockSummary(pos)));
            posBlocksAudited.push_back(entry);
        }
 
        uint256 poaMerkleRoot = pblock->ComputePoAMerkleTree();
        uint256 hashTarget;
        hashTarget.SetCompact(pblock->nBits);
 
        pblock->SetVersionPoABlock();
        UniValue result(UniValue::VOBJ);
        result.push_back(Pair("version", pblock->nVersion));
        result.push_back(Pair("previouspoablockhash", pblock->hashPrevPoABlock.GetHex()));
        result.push_back(Pair("poamerkleroot", poaMerkleRoot.GetHex()));
        result.push_back(Pair("transactions", transactions));
        result.push_back(Pair("coinbasetxn", coinbasetxn));
        result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0].GetValueOut()));
        result.push_back(Pair("noncerange", "00000000ffffffff"));
        result.push_back(Pair("curtime", pblock->GetBlockTime()));
        result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
        result.push_back(Pair("target", hashTarget.GetHex()));
        result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight + 1)));
        result.push_back(Pair("posblocksaudited", posBlocksAudited));
 
        if (pblock->payee != CScript()) {
            CTxDestination address1;
            ExtractDestination(pblock->payee, address1);
            CBitcoinAddress address2(address1);
            result.push_back(Pair("payee", address2.ToString().c_str()));
            result.push_back(Pair("payee_amount", (int64_t)pblock->vtx[0].vout[1].nValue));
        } else {
            result.push_back(Pair("payee", ""));
            result.push_back(Pair("payee_amount", ""));
        }
 
        result.push_back(Pair("masternode_payments", pblock->nTime > Params().StartMasternodePayments()));
        result.push_back(Pair("enforce_masternode_payments", true));
        return result;
    }
}
 
UniValue setminingnbits(const UniValue& params, bool fHelp) {
    if (fHelp || params.size() != 2)
        throw std::runtime_error(
                "setminingnbits value 1/0\n");
    unsigned int nbits = (unsigned int) params[0].get_int64();
    int changed= params[1].get_int();
    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("previous_bits", strprintf("%08x", N_BITS)));
    if (changed) {
        N_BITS = nbits;
    }
    result.push_back(Pair("current_bits", strprintf("%08x", N_BITS)));
    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:
    virtual void BlockChecked(const CBlock& block, const CValidationState& stateIn)
    {
        if (block.GetHash() != hash)
            return;
        found = true;
        state = stateIn;
    };
};
 
UniValue submitblock(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() < 1 || params.size() > 2)
        throw std::runtime_error(
            "submitblock \"hexdata\" ( \"jsonparametersobject\" )\n"
            "\nAttempts to submit new block to network.\n"
            "The 'jsonparametersobject' parameter is currently ignored.\n"
            "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.\n"
 
            "\nArguments\n"
            "1. \"hexdata\"    (string, required) the hex-encoded block data to submit\n"
            "2. \"jsonparametersobject\"     (string, optional) object of optional parameters\n"
            "    {\n"
            "      \"workid\" : \"id\"    (string, optional) if the server provided a workid, it MUST be included with submissions\n"
            "    }\n"
            "\nResult:\n"
            "\nExamples:\n" +
            HelpExampleCli("submitblock", "\"mydata\"") + HelpExampleRpc("submitblock", "\"mydata\""));
 
    //block received from miner does not have up-to-date previous block, need to update that before calling ProcessNewBlock
    CBlock block;
    std::string datastr(params[0].get_str());
 
    for (size_t i = 0; i < datastr.size(); i++) {
        if (('0' <= datastr[i] && datastr[i] <= '9') || ('a' <= datastr[i] && datastr[i] <= 'f') || ('A' <= datastr[i] && datastr[i] <= 'F')) {
 
        } else {
            datastr.erase(i, 1);
            break;
        }
    }
    if (!DecodeHexBlk(block, datastr)) {
        LogPrintf("Cannot decode block\n");
        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");
    }
 
    block.hashPrevBlock = chainActive.Tip()->GetBlockHash();
 
    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;
        }
    }
 
    CValidationState state;
    submitblock_StateCatcher sc(block.GetHash());
    RegisterValidationInterface(&sc);
    bool fAccepted = ProcessNewBlock(state, NULL, &block);
    UnregisterValidationInterface(&sc);
    if (fBlockPresent) {
        if (fAccepted && !sc.found)
            return "duplicate-inconclusive";
        return "duplicate";
    }
    if (fAccepted) {
        if (!sc.found)
            return "inconclusive";
        state = sc.state;
    }
    return BIP22ValidationResult(state);
}
 
UniValue estimatefee(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw std::runtime_error(
            "estimatefee nblocks\n"
            "\nEstimates the approximate fee per kilobyte\n"
            "needed for a transaction to begin confirmation\n"
            "within nblocks blocks.\n"
            "\nArguments:\n"
            "1. nblocks     (numeric)\n"
            "\nResult:\n"
            "n :    (numeric) estimated fee-per-kilobyte\n"
            "\n"
            "-1.0 is returned if not enough transactions and\n"
            "blocks have been observed to make an estimate.\n"
            "\nExample:\n" +
            HelpExampleCli("estimatefee", "6"));
 
    RPCTypeCheck(params, boost::assign::list_of(UniValue::VNUM));
 
    int nBlocks = params[0].get_int();
    if (nBlocks < 1)
        nBlocks = 1;
 
    CFeeRate feeRate = mempool.estimateFee(nBlocks);
    if (feeRate == CFeeRate(0))
        return -1.0;
 
    return ValueFromAmount(feeRate.GetFeePerK());
}
 
UniValue estimatepriority(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw std::runtime_error(
            "estimatepriority nblocks\n"
            "\nEstimates the approximate priority\n"
            "a zero-fee transaction needs to begin confirmation\n"
            "within nblocks blocks.\n"
            "\nArguments:\n"
            "1. nblocks     (numeric)\n"
            "\nResult:\n"
            "n :    (numeric) estimated priority\n"
            "\n"
            "-1.0 is returned if not enough transactions and\n"
            "blocks have been observed to make an estimate.\n"
            "\nExample:\n" +
            HelpExampleCli("estimatepriority", "6"));
 
    RPCTypeCheck(params, boost::assign::list_of(UniValue::VNUM));
 
    int nBlocks = params[0].get_int();
    if (nBlocks < 1)
        nBlocks = 1;
 
    return mempool.estimatePriority(nBlocks);
}