masternodeman.cpp

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// 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/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "masternodeman.h"
 
#include "addrman.h"
#include "masternode-payments.h"
#include "masternode-sync.h"
#include "messagesigner.h"
#include "fs.h"
#include "masternode.h"
#include "netbase.h"
#include "swifttx.h"
#include "util.h"
 
#define MN_WINNER_MINIMUM_AGE 8000    // Age in seconds. This should be > MASTERNODE_REMOVAL_SECONDS to avoid misconfigured new nodes in the list.
 
CMasternodeMan mnodeman;
CActiveMasternode activeMasternode;
 
struct CompareLastPaid {
    bool operator()(const std::pair<int64_t, CTxIn>& t1,
        const std::pair<int64_t, CTxIn>& t2) const
    {
        return t1.first < t2.first;
    }
};
 
struct CompareScoreTxIn {
    bool operator()(const std::pair<int64_t, CTxIn>& t1,
        const std::pair<int64_t, CTxIn>& t2) const
    {
        return t1.first < t2.first;
    }
};
 
struct CompareScoreMN {
    bool operator()(const std::pair<int64_t, CMasternode>& t1,
        const std::pair<int64_t, CMasternode>& t2) const
    {
        return t1.first < t2.first;
    }
};
 
//
// CMasternodeDB
//
 
CMasternodeDB::CMasternodeDB()
{
    pathMN = GetDataDir() / "mncache.dat";
    strMagicMessage = "MasternodeCache";
}
 
bool CMasternodeDB::Write(const CMasternodeMan& mnodemanToSave)
{
    int64_t nStart = GetTimeMillis();
 
    // serialize, checksum data up to that point, then append checksum
    CDataStream ssMasternodes(SER_DISK, CLIENT_VERSION);
    ssMasternodes << strMagicMessage;                   // masternode cache file specific magic message
    ssMasternodes << FLATDATA(Params().MessageStart()); // network specific magic number
    ssMasternodes << mnodemanToSave;
    uint256 hash = Hash(ssMasternodes.begin(), ssMasternodes.end());
    ssMasternodes << hash;
 
    // open output file, and associate with CAutoFile
    FILE* file = fsbridge::fopen(pathMN, "wb");
    CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
    if (fileout.IsNull())
        return error("%s : Failed to open file %s", __func__, pathMN.string());
 
    // Write and commit header, data
    try {
        fileout << ssMasternodes;
    } catch (const std::exception& e) {
        return error("%s : Serialize or I/O error - %s", __func__, e.what());
    }
 
    fileout.fclose();
 
    LogPrint(BCLog::MASTERNODE,"Written info to mncache.dat  %dms\n", GetTimeMillis() - nStart);
    LogPrint(BCLog::MASTERNODE,"  %s\n", mnodemanToSave.ToString());
 
    return true;
}
 
CMasternodeDB::ReadResult CMasternodeDB::Read(CMasternodeMan& mnodemanToLoad, bool fDryRun)
{
    int64_t nStart = GetTimeMillis();
    // open input file, and associate with CAutoFile
    FILE* file = fsbridge::fopen(pathMN, "rb");
    CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
    if (filein.IsNull()) {
        error("%s : Failed to open file %s", __func__, pathMN.string());
        return FileError;
    }
 
    // use file size to size memory buffer
    int fileSize = fs::file_size(pathMN);
    int dataSize = fileSize - sizeof(uint256);
    // Don't try to resize to a negative number if file is small
    if (dataSize < 0)
        dataSize = 0;
    std::vector<unsigned char> vchData;
    vchData.resize(dataSize);
    uint256 hashIn;
 
    // read data and checksum from file
    try {
        filein.read((char*)&vchData[0], dataSize);
        filein >> hashIn;
    } catch (const std::exception& e) {
        error("%s : Deserialize or I/O error - %s", __func__, e.what());
        return HashReadError;
    }
    filein.fclose();
 
    CDataStream ssMasternodes(vchData, SER_DISK, CLIENT_VERSION);
 
    // verify stored checksum matches input data
    uint256 hashTmp = Hash(ssMasternodes.begin(), ssMasternodes.end());
    if (hashIn != hashTmp) {
        error("%s : Checksum mismatch, data corrupted", __func__);
        return IncorrectHash;
    }
 
    unsigned char pchMsgTmp[4];
    std::string strMagicMessageTmp;
    try {
        // de-serialize file header (masternode cache file specific magic message) and ..
 
        ssMasternodes >> strMagicMessageTmp;
 
        // ... verify the message matches predefined one
        if (strMagicMessage != strMagicMessageTmp) {
            error("%s : Invalid masternode cache magic message", __func__);
            return IncorrectMagicMessage;
        }
 
        // de-serialize file header (network specific magic number) and ..
        ssMasternodes >> FLATDATA(pchMsgTmp);
 
        // ... verify the network matches ours
        if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp))) {
            error("%s : Invalid network magic number", __func__);
            return IncorrectMagicNumber;
        }
        // de-serialize data into CMasternodeMan object
        ssMasternodes >> mnodemanToLoad;
    } catch (const std::exception& e) {
        mnodemanToLoad.Clear();
        error("%s : Deserialize or I/O error - %s", __func__, e.what());
        return IncorrectFormat;
    }
 
    LogPrint(BCLog::MASTERNODE,"Loaded info from mncache.dat  %dms\n", GetTimeMillis() - nStart);
    LogPrint(BCLog::MASTERNODE,"  %s\n", mnodemanToLoad.ToString());
    if (!fDryRun) {
        LogPrint(BCLog::MASTERNODE,"Masternode manager - cleaning....\n");
        mnodemanToLoad.CheckAndRemove(true);
        LogPrint(BCLog::MASTERNODE,"Masternode manager - result:\n");
        LogPrint(BCLog::MASTERNODE,"  %s\n", mnodemanToLoad.ToString());
    }
 
    return Ok;
}
 
void DumpMasternodes()
{
    int64_t nStart = GetTimeMillis();
 
    CMasternodeDB mndb;
    CMasternodeMan tempMnodeman;
 
    LogPrint(BCLog::MASTERNODE,"Verifying mncache.dat format...\n");
    CMasternodeDB::ReadResult readResult = mndb.Read(tempMnodeman, true);
    // there was an error and it was not an error on file opening => do not proceed
    if (readResult == CMasternodeDB::FileError)
        LogPrint(BCLog::MASTERNODE,"Missing masternode cache file - mncache.dat, will try to recreate\n");
    else if (readResult != CMasternodeDB::Ok) {
        LogPrint(BCLog::MASTERNODE,"Error reading mncache.dat: ");
        if (readResult == CMasternodeDB::IncorrectFormat)
            LogPrint(BCLog::MASTERNODE,"magic is ok but data has invalid format, will try to recreate\n");
        else {
            LogPrint(BCLog::MASTERNODE,"file format is unknown or invalid, please fix it manually\n");
            return;
        }
    }
    LogPrint(BCLog::MASTERNODE,"Writting info to mncache.dat...\n");
    mndb.Write(mnodeman);
 
    LogPrint(BCLog::MASTERNODE,"Masternode dump finished  %dms\n", GetTimeMillis() - nStart);
}
 
CMasternodeMan::CMasternodeMan()
{
    nDsqCount = 0;
}
 
bool CMasternodeMan::Add(CMasternode& mn)
{
    LOCK(cs);
 
    if (!mn.IsEnabled())
        return false;
 
    CMasternode* pmn = Find(mn.vin);
    if (pmn == NULL) {
        LogPrint(BCLog::MASTERNODE, "CMasternodeMan: Adding new Masternode %s - %i now\n", mn.vin.prevout.hash.ToString(), size() + 1);
        vMasternodes.push_back(mn);
        return true;
    }
 
    return false;
}
 
void CMasternodeMan::AskForMN(CNode* pnode, CTxIn& vin)
{
    std::map<COutPoint, int64_t>::iterator i = mWeAskedForMasternodeListEntry.find(vin.prevout);
    if (i != mWeAskedForMasternodeListEntry.end()) {
        int64_t t = (*i).second;
        if (GetTime() < t) return; // we've asked recently
    }
 
    // ask for the mnb info once from the node that sent mnp
 
    LogPrint(BCLog::MASTERNODE, "CMasternodeMan::AskForMN - Asking node for missing entry, vin: %s\n", vin.prevout.hash.ToString());
    std::string stl(vin.masternodeStealthAddress.begin(), vin.masternodeStealthAddress.end());
    LogPrint(BCLog::MASTERNODE, "CMasternodeMan::AskForMN - stealth masternode address = %s\n", stl);
    pnode->PushMessage(NetMsgType::DSEG, vin);
    int64_t askAgain = GetTime() + MASTERNODE_MIN_MNP_SECONDS;
    mWeAskedForMasternodeListEntry[vin.prevout] = askAgain;
}
 
void CMasternodeMan::Check()
{
    LOCK(cs);
 
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
    }
}
 
void CMasternodeMan::CheckAndRemove(bool forceExpiredRemoval)
{
    Check();
 
    LOCK(cs);
 
    //remove inactive and outdated
    std::vector<CMasternode>::iterator it = vMasternodes.begin();
    while (it != vMasternodes.end()) {
        if ((*it).activeState == CMasternode::MASTERNODE_REMOVE ||
            (*it).activeState == CMasternode::MASTERNODE_VIN_SPENT ||
            (forceExpiredRemoval && (*it).activeState == CMasternode::MASTERNODE_EXPIRED) ||
            (*it).protocolVersion < masternodePayments.GetMinMasternodePaymentsProto()) {
            LogPrint(BCLog::MASTERNODE, "CMasternodeMan: Removing inactive Masternode %s - %i now,mapSeenMasternodeBroadcast.size=%d\n", (*it).vin.prevout.hash.ToString(), size() - 1, mapSeenMasternodeBroadcast.size());
 
            //erase all of the broadcasts we've seen from this vin
            // -- if we missed a few pings and the node was removed, this will allow is to get it back without them
            //    sending a brand new mnb
            std::map<uint256, CMasternodeBroadcast>::iterator it3 = mapSeenMasternodeBroadcast.begin();
            while (it3 != mapSeenMasternodeBroadcast.end()) {
                if ((*it3).second.vin == (*it).vin) {
                    masternodeSync.mapSeenSyncMNB.erase((*it3).first);
                    mapSeenMasternodeBroadcast.erase(it3++);
                } else {
                    ++it3;
                }
            }
 
            // allow us to ask for this masternode again if we see another ping
            std::map<COutPoint, int64_t>::iterator it2 = mWeAskedForMasternodeListEntry.begin();
            while (it2 != mWeAskedForMasternodeListEntry.end()) {
                if ((*it2).first == (*it).vin.prevout) {
                    mWeAskedForMasternodeListEntry.erase(it2++);
                } else {
                    ++it2;
                }
            }
 
            it = vMasternodes.erase(it);
        } else {
            ++it;
        }
    }
 
    // check who's asked for the Masternode list
    std::map<CNetAddr, int64_t>::iterator it1 = mAskedUsForMasternodeList.begin();
    while (it1 != mAskedUsForMasternodeList.end()) {
        if ((*it1).second < GetTime()) {
            mAskedUsForMasternodeList.erase(it1++);
        } else {
            ++it1;
        }
    }
 
    // check who we asked for the Masternode list
    it1 = mWeAskedForMasternodeList.begin();
    while (it1 != mWeAskedForMasternodeList.end()) {
        if ((*it1).second < GetTime()) {
            mWeAskedForMasternodeList.erase(it1++);
        } else {
            ++it1;
        }
    }
 
    // check which Masternodes we've asked for
    std::map<COutPoint, int64_t>::iterator it2 = mWeAskedForMasternodeListEntry.begin();
    while (it2 != mWeAskedForMasternodeListEntry.end()) {
        if ((*it2).second < GetTime()) {
            mWeAskedForMasternodeListEntry.erase(it2++);
        } else {
            ++it2;
        }
    }
 
    // remove expired mapSeenMasternodeBroadcast
    std::map<uint256, CMasternodeBroadcast>::iterator it3 = mapSeenMasternodeBroadcast.begin();
    while (it3 != mapSeenMasternodeBroadcast.end()) {
        if ((*it3).second.lastPing.sigTime < GetTime() - (MASTERNODE_REMOVAL_SECONDS * 2)) {
            mapSeenMasternodeBroadcast.erase(it3++);
            masternodeSync.mapSeenSyncMNB.erase((*it3).second.GetHash());
        } else {
            ++it3;
        }
    }
 
    // remove expired mapSeenMasternodePing
    std::map<uint256, CMasternodePing>::iterator it4 = mapSeenMasternodePing.begin();
    while (it4 != mapSeenMasternodePing.end()) {
        if ((*it4).second.sigTime < GetTime() - (MASTERNODE_REMOVAL_SECONDS * 2)) {
            mapSeenMasternodePing.erase(it4++);
        } else {
            ++it4;
        }
    }
}
 
void CMasternodeMan::Clear()
{
    LOCK(cs);
    vMasternodes.clear();
    mAskedUsForMasternodeList.clear();
    mWeAskedForMasternodeList.clear();
    mWeAskedForMasternodeListEntry.clear();
    mapSeenMasternodeBroadcast.clear();
    mapSeenMasternodePing.clear();
    nDsqCount = 0;
}
 
int CMasternodeMan::stable_size ()
{
    int nStable_size = 0;
    int nMinProtocol = ActiveProtocol();
    int64_t nMasternode_Min_Age = MN_WINNER_MINIMUM_AGE;
    int64_t nMasternode_Age = 0;
 
    for (CMasternode& mn : vMasternodes) {
        if (mn.protocolVersion < nMinProtocol) {
            continue; // Skip obsolete versions
        }
        mn.Check ();
        if (!mn.IsEnabled ())
            continue; // Skip not-enabled masternodes
 
        nStable_size++;
    }
 
    return nStable_size;
}
 
int CMasternodeMan::CountEnabled(int protocolVersion)
{
    int i = 0;
    protocolVersion = protocolVersion == -1 ? masternodePayments.GetMinMasternodePaymentsProto() : protocolVersion;
 
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
        if (mn.protocolVersion < protocolVersion || !mn.IsEnabled()) continue;
        i++;
    }
 
    return i;
}
 
void CMasternodeMan::CountNetworks(int protocolVersion, int& ipv4, int& ipv6, int& onion)
{
    protocolVersion = protocolVersion == -1 ? masternodePayments.GetMinMasternodePaymentsProto() : protocolVersion;
 
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
        std::string strHost;
        int port;
        SplitHostPort(mn.addr.ToString(), port, strHost);
        CNetAddr node;
        LookupHost(strHost.c_str(), node, false);
        int nNetwork = node.GetNetwork();
        switch (nNetwork) {
            case 1 :
                ipv4++;
                break;
            case 2 :
                ipv6++;
                break;
            case 3 :
                onion++;
                break;
        }
    }
}
 
void CMasternodeMan::DsegUpdate(CNode* pnode)
{
    LOCK(cs);
 
    if (Params().NetworkID() == CBaseChainParams::MAIN) {
        if (!(pnode->addr.IsRFC1918() || pnode->addr.IsLocal())) {
            std::map<CNetAddr, int64_t>::iterator it = mWeAskedForMasternodeList.find(pnode->addr);
            if (it != mWeAskedForMasternodeList.end()) {
                if (GetTime() < (*it).second) {
                    LogPrint(BCLog::MASTERNODE, "dseg - we already asked peer %i for the list; skipping...\n", pnode->GetId());
                    return;
                }
            }
        }
    }
 
    pnode->PushMessage(NetMsgType::DSEG, CTxIn());
    int64_t askAgain = GetTime() + MASTERNODES_DSEG_SECONDS;
    mWeAskedForMasternodeList[pnode->addr] = askAgain;
}
 
CMasternode* CMasternodeMan::Find(const CScript& payee)
{
    LOCK(cs);
    CScript payee2;
 
    for (CMasternode& mn : vMasternodes) {
        payee2 = GetScriptForDestination(mn.pubKeyCollateralAddress);
        if (payee2 == payee)
            return &mn;
    }
    return NULL;
}
 
CMasternode* CMasternodeMan::Find(const CTxIn& vin)
{
    LOCK(cs);
 
    for (CMasternode& mn : vMasternodes) {
        if (mn.vin.prevout == vin.prevout)
            return &mn;
    }
    return NULL;
}
 
 
CMasternode* CMasternodeMan::Find(const CPubKey& pubKeyMasternode)
{
    LOCK(cs);
 
    for (CMasternode& mn : vMasternodes) {
        if (mn.pubKeyMasternode == pubKeyMasternode)
            return &mn;
    }
    return NULL;
}
 
//
// Deterministically select the oldest/best masternode to pay on the network
//
CMasternode* CMasternodeMan::GetNextMasternodeInQueueForPayment(int nBlockHeight, bool fFilterSigTime, int& nCount)
{
    LOCK(cs);
 
    CMasternode* pBestMasternode = NULL;
    std::vector<std::pair<int64_t, CTxIn> > vecMasternodeLastPaid;
 
    /*
        Make a vector with all of the last paid times
    */
 
    int nMnCount = CountEnabled();
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
        if (!mn.IsEnabled()) continue;
 
        // //check protocol version
        if (mn.protocolVersion < masternodePayments.GetMinMasternodePaymentsProto()) continue;
 
        //it's in the list (up to 8 entries ahead of current block to allow propagation) -- so let's skip it
        if (masternodePayments.IsScheduled(mn, nBlockHeight)) continue;
 
        //it's too new, wait for a cycle
        if (fFilterSigTime && mn.sigTime + (nMnCount * 2.6 * 60) > GetAdjustedTime()) continue;
 
        //make sure it has as many confirmations as there are masternodes
        if (mn.GetMasternodeInputAge() < nMnCount) continue;
 
        vecMasternodeLastPaid.push_back(std::make_pair(mn.SecondsSincePayment(), mn.vin));
    }
 
    nCount = (int)vecMasternodeLastPaid.size();
 
    //when the network is in the process of upgrading, don't penalize nodes that recently restarted
    if (fFilterSigTime && nCount < nMnCount / 3) return GetNextMasternodeInQueueForPayment(nBlockHeight, false, nCount);
 
    // Sort them high to low
    sort(vecMasternodeLastPaid.rbegin(), vecMasternodeLastPaid.rend(), CompareLastPaid());
 
    // Look at 1/10 of the oldest nodes (by last payment), calculate their scores and pay the best one
    //  -- This doesn't look at who is being paid in the +8-10 blocks, allowing for double payments very rarely
    //  -- 1/100 payments should be a double payment on mainnet - (1/(3000/10))*2
    //  -- (chance per block * chances before IsScheduled will fire)
    int nTenthNetwork = CountEnabled() / 10;
    int nCountTenth = 0;
    uint256 nHigh;
    for (PAIRTYPE(int64_t, CTxIn) & s : vecMasternodeLastPaid) {
        CMasternode* pmn = Find(s.second);
        if (!pmn) break;
 
        uint256 n = pmn->CalculateScore(1, nBlockHeight - 100);
        if (n > nHigh) {
            nHigh = n;
            pBestMasternode = pmn;
        }
        nCountTenth++;
        if (nCountTenth >= nTenthNetwork) break;
    }
    return pBestMasternode;
}
 
CMasternode* CMasternodeMan::GetCurrentMasterNode(int mod, int64_t nBlockHeight, int minProtocol)
{
    int64_t score = 0;
    CMasternode* winner = NULL;
 
    // scan for winner
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
        if (mn.protocolVersion < minProtocol || !mn.IsEnabled()) continue;
 
        // calculate the score for each Masternode
        uint256 n = mn.CalculateScore(mod, nBlockHeight);
        int64_t n2 = n.GetCompact(false);
 
        // determine the winner
        if (n2 > score) {
            score = n2;
            winner = &mn;
        }
    }
 
    return winner;
}
 
int CMasternodeMan::GetMasternodeRank(const CTxIn& vin, int64_t nBlockHeight, int minProtocol, bool fOnlyActive)
{
    std::vector<std::pair<int64_t, CTxIn> > vecMasternodeScores;
    int64_t nMasternode_Min_Age = MN_WINNER_MINIMUM_AGE;
    int64_t nMasternode_Age = 0;
 
    //make sure we know about this block
    uint256 hash;
    if (!GetBlockHash(hash, nBlockHeight)) return -1;
 
    // scan for winner
    for (CMasternode& mn : vMasternodes) {
        if (mn.protocolVersion < minProtocol) {
            LogPrint(BCLog::MASTERNODE,"Skipping Masternode with obsolete version %d\n", mn.protocolVersion);
            continue;                                                       // Skip obsolete versions
        }
 
        if (fOnlyActive) {
            mn.Check();
            if (!mn.IsEnabled()) continue;
        }
        uint256 n = mn.CalculateScore(1, nBlockHeight);
        int64_t n2 = n.GetCompact(false);
 
        vecMasternodeScores.push_back(std::make_pair(n2, mn.vin));
    }
 
    sort(vecMasternodeScores.rbegin(), vecMasternodeScores.rend(), CompareScoreTxIn());
 
    int rank = 0;
    for (PAIRTYPE(int64_t, CTxIn) & s : vecMasternodeScores) {
        rank++;
        if (s.second.prevout == vin.prevout) {
            return rank;
        }
    }
 
    return -1;
}
 
std::vector<std::pair<int, CMasternode> > CMasternodeMan::GetMasternodeRanks(int64_t nBlockHeight, int minProtocol)
{
    std::vector<std::pair<int64_t, CMasternode> > vecMasternodeScores;
    std::vector<std::pair<int, CMasternode> > vecMasternodeRanks;
 
    //make sure we know about this block
    uint256 hash;
    if (!GetBlockHash(hash, nBlockHeight)) return vecMasternodeRanks;
 
    // scan for winner
    for (CMasternode& mn : vMasternodes) {
        mn.Check();
 
        if (mn.protocolVersion < minProtocol) continue;
 
        if (!mn.IsEnabled()) {
            vecMasternodeScores.push_back(std::make_pair(9999, mn));
            continue;
        }
 
        uint256 n = mn.CalculateScore(1, nBlockHeight);
        int64_t n2 = n.GetCompact(false);
 
        vecMasternodeScores.push_back(std::make_pair(n2, mn));
    }
 
    sort(vecMasternodeScores.rbegin(), vecMasternodeScores.rend(), CompareScoreMN());
 
    int rank = 0;
    for (PAIRTYPE(int64_t, CMasternode) & s : vecMasternodeScores) {
        rank++;
        vecMasternodeRanks.push_back(std::make_pair(rank, s.second));
    }
 
    return vecMasternodeRanks;
}
 
CMasternode* CMasternodeMan::GetMasternodeByRank(int nRank, int64_t nBlockHeight, int minProtocol, bool fOnlyActive)
{
    std::vector<std::pair<int64_t, CTxIn> > vecMasternodeScores;
 
    // scan for winner
    for (CMasternode& mn : vMasternodes) {
        if (mn.protocolVersion < minProtocol) continue;
        if (fOnlyActive) {
            mn.Check();
            if (!mn.IsEnabled()) continue;
        }
 
        uint256 n = mn.CalculateScore(1, nBlockHeight);
        int64_t n2 = n.GetCompact(false);
 
        vecMasternodeScores.push_back(std::make_pair(n2, mn.vin));
    }
 
    sort(vecMasternodeScores.rbegin(), vecMasternodeScores.rend(), CompareScoreTxIn());
 
    int rank = 0;
    for (PAIRTYPE(int64_t, CTxIn) & s : vecMasternodeScores) {
        rank++;
        if (rank == nRank) {
            return Find(s.second);
        }
    }
 
    return NULL;
}
 
void CMasternodeMan::ProcessMessage(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{
    if (fLiteMode) return; //disable all Masternode related functionality
    if (!masternodeSync.IsBlockchainSynced()) return;
 
    LOCK(cs_process_message);
    if (strCommand == NetMsgType::MNBROADCAST) { //Masternode Broadcast
        CMasternodeBroadcast mnb;
        vRecv >> mnb;
 
        if (mapSeenMasternodeBroadcast.count(mnb.GetHash())) { //seen
            masternodeSync.AddedMasternodeList(mnb.GetHash());
            return;
        }
        mapSeenMasternodeBroadcast.insert(std::make_pair(mnb.GetHash(), mnb));
 
        int nDoS = 0;
        if (!mnb.CheckAndUpdate(nDoS)) {
            if (nDoS > 0) {
                LOCK(cs_main);
                Misbehaving(pfrom->GetId(), nDoS);
            }
            //failed
            return;
        }
 
        // make sure the vout that was signed is related to the transaction that spawned the Masternode
        //  - this is expensive, so it's only done once per Masternode
        if (!mnb.IsInputAssociatedWithPubkey(mnb.vin, mnb.pubKeyCollateralAddress)) {
            LogPrintf("CMasternodeMan::ProcessMessage() : mnb - Got mismatched pubkey and vin\n");
            LOCK(cs_main);
            Misbehaving(pfrom->GetId(), 33);
            return;
        }
 
        // make sure it's still unspent
        //  - this is checked later by .check() in many places and by ThreadCheckMasternodes()
        if (mnb.CheckInputsAndAdd(nDoS)) {
            // use this as a peer
            addrman.Add(CAddress(mnb.addr, NODE_NETWORK), pfrom->addr, 2 * 60 * 60);
            masternodeSync.AddedMasternodeList(mnb.GetHash());
        } else {
            LogPrint(BCLog::MASTERNODE,"mnb - Rejected Masternode entry %s\n", mnb.vin.prevout.hash.ToString());
 
            if (nDoS > 0) {
                LOCK(cs_main);
                Misbehaving(pfrom->GetId(), nDoS);
            }
        }
    }
 
    else if (strCommand == NetMsgType::MNPING) { //Masternode Ping
        CMasternodePing mnp;
        vRecv >> mnp;
 
        LogPrint(BCLog::MNPING, "mnp - Masternode ping, vin: %s\n", mnp.vin.prevout.hash.ToString());
 
        if (mapSeenMasternodePing.count(mnp.GetHash())) return; //seen
        mapSeenMasternodePing.insert(std::make_pair(mnp.GetHash(), mnp));
 
        int nDoS = 0;
        if (mnp.CheckAndUpdate(nDoS)) return;
 
        if (nDoS > 0) {
            // if anything significant failed, mark that node
            LOCK(cs_main);
            Misbehaving(pfrom->GetId(), nDoS);
        } else {
            // if nothing significant failed, search existing Masternode list
            CMasternode* pmn = Find(mnp.vin);
            // if it's known, don't ask for the mnb, just return
            if (pmn != NULL) return;
        }
 
        // something significant is broken or mn is unknown,
        // we might have to ask for a masternode entry once
        AskForMN(pfrom, mnp.vin);
 
    } else if (strCommand == NetMsgType::DSEG) { //Get Masternode list or specific entry
 
        CTxIn vin;
        vRecv >> vin;
        if (vin == CTxIn()) { //only should ask for this once
            //local network
            bool isLocal = (pfrom->addr.IsRFC1918() || pfrom->addr.IsLocal());
 
            if (!isLocal && Params().NetworkID() == CBaseChainParams::MAIN) {
                std::map<CNetAddr, int64_t>::iterator i = mAskedUsForMasternodeList.find(pfrom->addr);
                if (i != mAskedUsForMasternodeList.end()) {
                    int64_t t = (*i).second;
                    if (GetTime() < t) {
                        LogPrintf("CMasternodeMan::ProcessMessage() : dseg - peer already asked me for the list\n");
                        LOCK(cs_main);
                        Misbehaving(pfrom->GetId(), 34);
                        return;
                    }
                }
                int64_t askAgain = GetTime() + MASTERNODES_DSEG_SECONDS;
                mAskedUsForMasternodeList[pfrom->addr] = askAgain;
            }
        } //else, asking for a specific node which is ok
 
 
        int nInvCount = 0;
        for (CMasternode& mn : vMasternodes) {
            if (mn.addr.IsRFC1918()) continue; //local network
 
            if (mn.IsEnabled()) {
                LogPrint(BCLog::MASTERNODE, "dseg - Sending Masternode entry - %s \n", mn.vin.prevout.hash.ToString());
                if (vin == CTxIn() || vin == mn.vin) {
                    CMasternodeBroadcast mnb = CMasternodeBroadcast(mn);
                    uint256 hash = mnb.GetHash();
                    pfrom->PushInventory(CInv(MSG_MASTERNODE_ANNOUNCE, hash));
                    nInvCount++;
 
                    if (!mapSeenMasternodeBroadcast.count(hash)) mapSeenMasternodeBroadcast.insert(std::make_pair(hash, mnb));
 
                    if (vin == mn.vin) {
                        LogPrint(BCLog::MASTERNODE, "dseg - Sent 1 Masternode entry to peer %i\n", pfrom->GetId());
                        return;
                    }
                }
            }
        }
 
        if (vin == CTxIn()) {
            pfrom->PushMessage(NetMsgType::SYNCSTATUSCOUNT, MASTERNODE_SYNC_LIST, nInvCount);
            LogPrint(BCLog::MASTERNODE, "dseg - Sent %d Masternode entries to peer %i\n", nInvCount, pfrom->GetId());
        }
    }
}
 
void CMasternodeMan::Remove(CTxIn vin)
{
    LOCK(cs);
 
    std::vector<CMasternode>::iterator it = vMasternodes.begin();
    while (it != vMasternodes.end()) {
        if ((*it).vin == vin) {
            LogPrint(BCLog::MASTERNODE, "CMasternodeMan: Removing Masternode %s - %i now\n", (*it).vin.prevout.hash.ToString(), size() - 1);
            vMasternodes.erase(it);
            break;
        }
        ++it;
    }
}
 
void CMasternodeMan::UpdateMasternodeList(CMasternodeBroadcast mnb)
{
    LOCK(cs);
    mapSeenMasternodePing.insert(std::make_pair(mnb.lastPing.GetHash(), mnb.lastPing));
    mapSeenMasternodeBroadcast.insert(std::make_pair(mnb.GetHash(), mnb));
 
    LogPrint(BCLog::MASTERNODE,"CMasternodeMan::UpdateMasternodeList -- masternode=%s\n", mnb.vin.prevout.ToStringShort());
 
    CMasternode* pmn = Find(mnb.vin);
    if (pmn == NULL) {
        CMasternode mn(mnb);
        if (Add(mn)) {
            masternodeSync.AddedMasternodeList(mnb.GetHash());
        }
    } else if (pmn->UpdateFromNewBroadcast(mnb)) {
        masternodeSync.AddedMasternodeList(mnb.GetHash());
    }
}
 
std::string CMasternodeMan::ToString() const
{
    std::ostringstream info;
 
    info << "Masternodes: " << (int)vMasternodes.size() << ", peers who asked us for Masternode list: " << (int)mAskedUsForMasternodeList.size() << ", peers we asked for Masternode list: " << (int)mWeAskedForMasternodeList.size() << ", entries in Masternode list we asked for: " << (int)mWeAskedForMasternodeListEntry.size();
 
    return info.str();
}
 
void ThreadCheckMasternodes()
{
    if (fLiteMode) return; //disable all Masternode related functionality
 
    // Make this thread recognisable as the wallet flushing thread
    util::ThreadRename("prcycoin-masternodeman");
    LogPrintf("Masternodes thread started\n");
 
    unsigned int c = 0;
 
    while (true) {
        MilliSleep(1000);
 
        // try to sync from all available nodes, one step at a time
        masternodeSync.Process();
 
        if (masternodeSync.IsBlockchainSynced()) {
            c++;
 
            // check if we should activate or ping every few minutes,
            // start right after sync is considered to be done
            if (c % MASTERNODE_PING_SECONDS == 1) activeMasternode.ManageStatus();
 
            if (c % 60 == 0) {
                mnodeman.CheckAndRemove();
                masternodePayments.CleanPaymentList();
                CleanTransactionLocksList();
            }
        }
    }
}