main.h

// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2013-2017 The Anoncoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef ANONCOIN_MAIN_H
#define ANONCOIN_MAIN_H

#if defined(HAVE_CONFIG_H)
#include "config/anoncoin-config.h"
#endif

#include "amount.h"
#include "block.h"
#include "chain.h"
#include "chainparams.h"
#include "consensus.h"
#include "coins.h"
#include "net.h"
#include "script.h"
#include "sync.h"
#include "txmempool.h"
#include "uint256.h"
#include "undo.h"

#include <algorithm>
#include <exception>
#include <map>
#include <set>
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>

#include <boost/unordered_map.hpp>

using namespace CashIsKing;

class CBlockIndex;
class CBlockTreeDB;
class CBloomFilter;
class CInv;
class CScriptCheck;
class CValidationInterface;
class CValidationState;

struct CBlockTemplate;
struct CNodeStateStats;

/** Default for -blockmaxsize and -blockminsize, which control the range of sizes the mining code will create **/
extern const uint32_t DEFAULT_BLOCK_MAX_SIZE;
extern const uint32_t DEFAULT_BLOCK_MIN_SIZE;
/** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
extern const uint32_t DEFAULT_BLOCK_PRIORITY_SIZE;
/** The maximum size for transactions we're willing to relay/mine */
extern const uint32_t MAX_STANDARD_TX_SIZE;
/** The maximum allowed number of signature check operations in a block (network rule) */
extern const uint32_t MAX_BLOCK_SIGOPS;
/** Maximum number of signature check operations in an IsStandard() P2SH script */
extern const uint32_t MAX_P2SH_SIGOPS;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
extern const uint32_t MAX_TX_SIGOPS;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
extern const uint32_t DEFAULT_MAX_ORPHAN_TRANSACTIONS;
/** The maximum size of a blk?????.dat file (since 0.8) */
extern const uint32_t MAX_BLOCKFILE_SIZE;
/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
extern const uint32_t BLOCKFILE_CHUNK_SIZE;
/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
extern const uint32_t UNDOFILE_CHUNK_SIZE;
/** Coinbase transaction outputs can only be spent after this number of new blocks (network rule) */
extern const int32_t COINBASE_MATURITY;
/** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */
extern const uint32_t LOCKTIME_THRESHOLD;
/** Maximum number of script-checking threads allowed */
extern const int32_t MAX_SCRIPTCHECK_THREADS;
/** -par default (number of script-checking threads, 0 = auto) */
extern const int32_t DEFAULT_SCRIPTCHECK_THREADS;
/** Number of blocks that can be requested at any given time from a single peer. */
extern const int32_t MAX_BLOCKS_IN_TRANSIT_PER_PEER;
/** Timeout in seconds during which a peer must stall block download progress before being disconnected. */
extern const uint32_t BLOCK_STALLING_TIMEOUT;
/** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
 *  less than this number, we reached their tip. Changing this value is a protocol upgrade. */
extern const uint32_t MAX_HEADERS_RESULTS;
/** Size of the "block download window": how far ahead of our current height do we fetch?
 *  Larger windows tolerate larger download speed differences between peer, but increase the potential
 *  degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
 *  harder). We'll probably want to make this a per-peer adaptive value at some point. */
extern const uint32_t BLOCK_DOWNLOAD_WINDOW;
/** Time to wait (in seconds) between writing blockchain state to disk. */
extern const uint32_t DATABASE_WRITE_INTERVAL;
/** Maximum length of reject messages. */
extern const uint32_t MAX_REJECT_MESSAGE_LENGTH;
/** Minimum disk space required - used in CheckDiskSpace() */
extern const uint64_t nMinDiskSpace;
/** The maximum size for mined blocks */
extern const uint32_t MAX_BLOCK_SIZE_GEN;
/** Timeout in seconds before considering a block download peer unresponsive. */
extern const uint32_t BLOCK_DOWNLOAD_TIMEOUT;
/** Dust Soft Limit, allowed with additional fee per output */
extern const int64_t DUST_SOFT_LIMIT;

/** "reject" message codes */
extern const uint8_t REJECT_MALFORMED;
extern const uint8_t REJECT_INVALID;
extern const uint8_t REJECT_OBSOLETE;
extern const uint8_t REJECT_DUPLICATE;
extern const uint8_t REJECT_NONSTANDARD;
extern const uint8_t REJECT_DUST;
extern const uint8_t REJECT_INSUFFICIENTFEE;
extern const uint8_t REJECT_CHECKPOINT;


extern CScript COINBASE_FLAGS;
extern CCriticalSection cs_main;
extern CTxMemPool mempool;
typedef boost::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
extern BlockMap mapBlockIndex;
extern const std::string strMessageMagic;
extern int64_t nTimeBestReceived;
extern CWaitableCriticalSection csBestBlock;
extern CConditionVariable cvBlockChange;
extern bool fImporting;
extern bool fReindex;
extern int nScriptCheckThreads;
extern bool fTxIndex;
extern bool fIsBareMultisigStd;
extern bool fCheckBlockIndex;
extern unsigned int nCoinCacheSize;
extern CFeeRate minRelayTxFee;
//! Used to initialize Testnet, soon after the genesis block has been created and the system initialized
extern bool fGenerateInitialTestNetState;

/** Best header we've seen so far (used for getheaders queries' starting points). */
extern CBlockIndex *pindexBestHeader;

/** Register a wallet to receive updates from core */
void RegisterValidationInterface(CValidationInterface* pInterfaceIn);
/** Unregister a wallet from core */
void UnregisterValidationInterface(CValidationInterface* pInterfaceIn);
/** Unregister all wallets from core */
void UnregisterAllValidationInterfaces();
/** Push an updated transaction to all registered wallets */
void SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL);

/** Register with a network node to receive its signals */
void RegisterNodeSignals(CNodeSignals& nodeSignals);
/** Unregister a network node */
void UnregisterNodeSignals(CNodeSignals& nodeSignals);

/**
 * Process an incoming block. This only returns after the best known valid
 * block is made active. Note that it does not, however, guarantee that the
 * specific block passed to it has been checked for validity!
 *
 * @param[out]  state   This may be set to an Error state if any error occurred processing it, including during
 *                      validation/connection/etc of otherwise unrelated blocks during reorganization; or it may
 *                      be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even
 *                      when the block is checked). If you want to *possibly* get feedback on whether pblock is
 *                      valid, you must also install a CValidationInterface - this will have its BlockChecked
 *                      method called whenever *any* block completes validation.
 * @param[in]   pfrom   The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
 * @param[in]   pblock  The block we want to process.
 * @param[out]  dbp     If pblock is stored to disk (or already there), this will be set to its location.
 * @return True if state.IsValid()
 */
bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp = NULL);
/** Check whether enough disk space is available for an incoming block */
bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
/** Open a block file (blk?????.dat) */
FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false);
/** Open an undo file (rev?????.dat) */
FILE* OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false);
/** Translation to a filesystem path */
boost::filesystem::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix);
/** Import blocks from an external file */
bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp = NULL);
/** Initialize a new block tree database + block data on disk */
bool InitBlockIndex();
/** Load the block tree and coins database from disk */
bool LoadBlockIndex();
/** Unload database information */
void UnloadBlockIndex();
/** Process protocol messages received from a given node */
bool ProcessMessages(CNode* pfrom);
/**
 * Send queued protocol messages to be sent to a give node.
 *
 * @param[in]   pto             The node which we are sending messages to.
 * @param[in]   fSendTrickle    When true send the trickled data, otherwise trickle the data until true.
 */
bool SendMessages(CNode* pto, bool fSendTrickle);
/** Run an instance of the script checking thread */
void ThreadScriptCheck();
/** Check whether we are doing an initial block download (synchronizing from disk or network) */
bool IsInitialBlockDownload();
/** Format a string that describes several potential problems detected by the core */
std::string GetWarnings(std::string strFor);
/** Retrieve a transaction (from memory pool, or from disk, if possible) */
bool GetTransaction(const uint256 &hash, CTransaction &tx, uintFakeHash &hashBlock, bool fAllowSlow = false);
/** Find the best known block, and make it the tip of the block chain */
bool ActivateBestChain(CValidationState &state, CBlock *pblock = NULL);

/** Create a new block index entry for a given block hash */
CBlockIndex * InsertBlockIndex(uint256 hash);
/** Verify a signature */
bool VerifySignature(const CCoins& txFrom, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
/** Abort with a message */
bool AbortNode(const std::string &msg);
/** Get statistics from node state */
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
/** Increase a node's misbehavior score. */
void Misbehaving(NodeId nodeid, int howmuch);
/** Flush all state, indexes and buffers to disk. */
void FlushStateToDisk();


/** (try to) add transaction to memory pool **/
bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
                        bool* pfMissingInputs, bool fRejectInsaneFee=false);


struct CNodeStateStats {
    int nMisbehavior;
    int nSyncHeight;
    int nCommonHeight;
    std::vector<int> vHeightInFlight;
};

struct CDiskTxPos : public CDiskBlockPos
{
    unsigned int nTxOffset; // after header

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
        READWRITE(*(CDiskBlockPos*)this);
        READWRITE(VARINT(nTxOffset));
    }

    CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
    }

    CDiskTxPos() {
        SetNull();
    }

    void SetNull() {
        CDiskBlockPos::SetNull();
        nTxOffset = 0;
    }
};


CAmount GetMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree);

/**
 * Check transaction inputs, and make sure any
 * pay-to-script-hash transactions are evaluating IsStandard scripts
 *
 * Why bother? To avoid denial-of-service attacks; an attacker
 * can submit a standard HASH... OP_EQUAL transaction,
 * which will get accepted into blocks. The redemption
 * script can be anything; an attacker could use a very
 * expensive-to-check-upon-redemption script like:
 *   DUP CHECKSIG DROP ... repeated 100 times... OP_1
 */

/**
 * Check for standard transaction types
 * @param[in] mapInputs    Map of previous transactions that have outputs we're spending
 * @return True if all inputs (scriptSigs) use only standard transaction forms
 */
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);

/**
 * Count ECDSA signature operations the old-fashioned (pre-0.6) way
 * @return number of sigops this transaction's outputs will produce when spent
 * @see CTransaction::FetchInputs
 */
unsigned int GetLegacySigOpCount(const CTransaction& tx);

/**
 * Count ECDSA signature operations in pay-to-script-hash inputs.
 *
 * @param[in] mapInputs Map of previous transactions that have outputs we're spending
 * @return maximum number of sigops required to validate this transaction's inputs
 * @see CTransaction::FetchInputs
 */
unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);


/**
 * Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
 * This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it
 * instead of being performed inline.
 */
bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &view, bool fScriptChecks,
                 unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks = NULL);

/** Apply the effects of this transaction on the UTXO set represented by view */
void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, CTxUndo &txundo, int nHeight);
void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, int nHeight);

/** Context-independent validity checks */
bool CheckTransaction(const CTransaction& tx, CValidationState& state);

/** Check for standard transaction types
 * @return True if all outputs (scriptPubKeys) use only standard transaction forms
 */
bool IsStandardTx(const CTransaction& tx, std::string& reason);

bool IsFinalTx(const CTransaction &tx, int nBlockHeight = 0, int64_t nBlockTime = 0);

/** Undo information for a CBlock */
class CBlockUndo
{
public:
    std::vector<CTxUndo> vtxundo; // for all but the coinbase

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
        READWRITE(vtxundo);
    }

    bool WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock);
    bool ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock);
};


/**
 * Closure representing one script verification
 * Note that this stores references to the spending transaction
 */
class CScriptCheck
{
private:
    CScript scriptPubKey;
    const CTransaction *ptxTo;
    unsigned int nIn;
    unsigned int nFlags;
    bool cacheStore;
    ScriptError error;

public:
    CScriptCheck(): ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
    CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn) :
        scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
        ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR) { }

    bool operator()();

    void swap(CScriptCheck &check) {
        scriptPubKey.swap(check.scriptPubKey);
        std::swap(ptxTo, check.ptxTo);
        std::swap(nIn, check.nIn);
        std::swap(nFlags, check.nFlags);
        std::swap(cacheStore, check.cacheStore);
        std::swap(error, check.error);
    }

    ScriptError GetScriptError() const { return error; }
};


/** Functions for disk access for blocks */
bool WriteBlockToDisk(CBlock& block, CDiskBlockPos& pos);
bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos);
bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex);


/** Functions for validating blocks and updating the block tree */

/** Undo the effects of this block (with given index) on the UTXO set represented by coins.
 *  In case pfClean is provided, operation will try to be tolerant about errors, and *pfClean
 *  will be true if no problems were found. Otherwise, the return value will be false in case
 *  of problems. Note that in any case, coins may be modified. */
bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins, bool* pfClean = NULL);

/** Apply the effects of this block (with given index) on the UTXO set represented by coins */
bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& view, bool fJustCheck = false);

/** Context-independent validity checks */
bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW = true, bool fCheckMerkleRoot = true);

bool ContextualCheckBlock(const CBlock& block, CValidationState& state, const CBlockIndex *pindexPrev);

/** Check a block is completely valid from start to finish (only works on top of our current best block, with cs_main held) */
bool TestBlockValidity(CValidationState &state, const CBlock& block, const CBlockIndex* pindexPrev, bool fCheckPOW = true, bool fCheckMerkleRoot = true);

/** Store block on disk. If dbp is provided, the file is known to already reside on disk */
bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex **pindex, CDiskBlockPos* dbp = NULL);
bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex **ppindex= NULL);



class CBlockFileInfo
{
public:
    unsigned int nBlocks;      //! number of blocks stored in file
    unsigned int nSize;        //! number of used bytes of block file
    unsigned int nUndoSize;    //! number of used bytes in the undo file
    unsigned int nHeightFirst; //! lowest height of block in file
    unsigned int nHeightLast;  //! highest height of block in file
    uint64_t nTimeFirst;         //! earliest time of block in file
    uint64_t nTimeLast;          //! latest time of block in file

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
        READWRITE(VARINT(nBlocks));
        READWRITE(VARINT(nSize));
        READWRITE(VARINT(nUndoSize));
        READWRITE(VARINT(nHeightFirst));
        READWRITE(VARINT(nHeightLast));
        READWRITE(VARINT(nTimeFirst));
        READWRITE(VARINT(nTimeLast));
    }

     void SetNull() {
         nBlocks = 0;
         nSize = 0;
         nUndoSize = 0;
         nHeightFirst = 0;
         nHeightLast = 0;
         nTimeFirst = 0;
         nTimeLast = 0;
     }

     CBlockFileInfo() {
         SetNull();
     }

     std::string ToString() const;

     /** update statistics (does not update nSize) */
     void AddBlock(unsigned int nHeightIn, uint64_t nTimeIn) {
         if (nBlocks==0 || nHeightFirst > nHeightIn)
             nHeightFirst = nHeightIn;
         if (nBlocks==0 || nTimeFirst > nTimeIn)
             nTimeFirst = nTimeIn;
         nBlocks++;
         if (nHeightIn > nHeightLast)
             nHeightLast = nHeightIn;
         if (nTimeIn > nTimeLast)
             nTimeLast = nTimeIn;
     }
};

/** Capture information about block/transaction validation */
class CValidationState {
private:
    enum mode_state {
        MODE_VALID,   //! everything ok
        MODE_INVALID, //! network rule violation (DoS value may be set)
        MODE_ERROR,   //! run-time error
    } mode;
    int nDoS;
    std::string strRejectReason;
    unsigned char chRejectCode;
    bool corruptionPossible;
public:
    CValidationState() : mode(MODE_VALID), nDoS(0), corruptionPossible(false) {}
    bool DoS(int level, bool ret = false,
             unsigned char chRejectCodeIn=0, std::string strRejectReasonIn="",
             bool corruptionIn=false) {
        chRejectCode = chRejectCodeIn;
        strRejectReason = strRejectReasonIn;
        corruptionPossible = corruptionIn;
        if (mode == MODE_ERROR)
            return ret;
        nDoS += level;
        mode = MODE_INVALID;
        return ret;
    }
    bool Invalid(bool ret = false,
                 unsigned char _chRejectCode=0, std::string _strRejectReason="") {
        return DoS(0, ret, _chRejectCode, _strRejectReason);
    }
    bool Error(std::string strRejectReasonIn="") {
        if (mode == MODE_VALID)
            strRejectReason = strRejectReasonIn;
        mode = MODE_ERROR;
        return false;
    }
    bool Abort(const std::string &msg) {
        AbortNode(msg);
        return Error(msg);
    }
    bool IsValid() const {
        return mode == MODE_VALID;
    }
    bool IsInvalid() const {
        return mode == MODE_INVALID;
    }
    bool IsError() const {
        return mode == MODE_ERROR;
    }
    bool IsInvalid(int &nDoSOut) const {
        if (IsInvalid()) {
            nDoSOut = nDoS;
            return true;
        }
        return false;
    }
    bool CorruptionPossible() const {
        return corruptionPossible;
    }
    unsigned char GetRejectCode() const { return chRejectCode; }
    std::string GetRejectReason() const { return strRejectReason; }
};

/** RAII wrapper for VerifyDB: Verify consistency of the block and coin databases */
class CVerifyDB {
public:
    CVerifyDB();
    ~CVerifyDB();
    // bool VerifyDB(CCoinsView *coinsview, int nCheckLevel, int nCheckDepth);
};

/** Find the last common block between the parameter chain and a locator. */
CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator);

/** Mark a block as invalid. */
bool InvalidateBlock(CValidationState& state, CBlockIndex *pindex);

/** Remove invalidity status from a block and its descendants. */
bool ReconsiderBlock(CValidationState& state, CBlockIndex *pindex);

/** The currently-connected chain of blocks. */
extern CChain chainActive;

/** The Anoncoin hardfork manager */
extern CashIsKing::ANCConsensus ancConsensus;

/** Global variable that points to the active CCoinsView (protected by cs_main) */
extern CCoinsViewCache *pcoinsTip;

/** Global variable that points to the active block tree (protected by cs_main) */
extern CBlockTreeDB *pblocktree;

struct CBlockTemplate
{
    CBlock block;
    std::vector<int64_t> vTxFees;
    std::vector<int64_t> vTxSigOps;
};


class CValidationInterface {
protected:
    virtual void SyncTransaction(const CTransaction& tx, const CBlock* pblock) {};
    virtual void SetBestChain(const CBlockLocator& locator) {};
    virtual void UpdatedTransaction(const uint256& uintTxHash) {};
    virtual void Inventory(const uintFakeHash& uintShad) {};
    virtual void ResendWalletTransactions() {};
    virtual void BlockChecked(const CBlock& block, const CValidationState& vsIn) {};
    virtual void GetScriptForMining(boost::shared_ptr<CReserveScript>& pubKey) {};
    virtual void ResetRequestCount(const uintFakeHash &shad) {};
    friend void ::RegisterValidationInterface(CValidationInterface*);
    friend void ::UnregisterValidationInterface(CValidationInterface*);
    friend void ::UnregisterAllValidationInterfaces();
};

struct CMainSignals {
    /** Notifies listeners of updated transaction data (transaction, and optionally the block it is found in. */
    boost::signals2::signal<void (const CTransaction&, const CBlock*)> SyncTransaction;
    /** Notifies listeners of an updated transaction without new data (for now: a coinbase potentially becoming visible). */
    boost::signals2::signal<void (const uint256&)> UpdatedTransaction;
    /** Notifies listeners of a new active block chain. */
    boost::signals2::signal<void (const CBlockLocator&)> SetBestChain;
    /** Notifies listeners about an inventory item being seen on the network. */
    //! Inventory hashes are only fake sha256d for blocks, if it is a transaction, we really do use sha256d for the hash
    boost::signals2::signal<void (const uintFakeHash&)> Inventory;
    /** Tells listeners to broadcast their data. */
    boost::signals2::signal<void ()> Broadcast;
    /** Notifies listeners of a block validation result */
    boost::signals2::signal<void (const CBlock&, const CValidationState&)> BlockChecked;
    /** Notifies listeners that a key for mining is required (coinbase) */
    boost::signals2::signal<void (boost::shared_ptr<CReserveScript>&)> GetScriptForMining;
    /** Notifies listeners that a block has been successfully mined */
    boost::signals2::signal<void (const uint256&)> BlockFound;
};

CMainSignals& GetMainSignals();


// v9 code needs these defined and are nearly all that is left for backward compatibility requirements
/** Verify consistency of the block and coin databases */
bool VerifyDB(int nCheckLevel, int nCheckDepth);

// fee calculations in order to compile and link wallet.cpp and coincontroldialog+other options for QT
enum GetMinFee_mode
{
    GMF_RELAY,
    GMF_SEND,
};

int64_t GetMinFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree, enum GetMinFee_mode mode);

#endif // ANONCOIN_MAIN_H