policy.h

// Copyright (c) 2007-2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 The Bitcoin Core developers
// Copyright (c) 2011-2017 The Litecoin Core developers
// Copyright (c) 2013-2017 The Goldcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.


#ifndef BITCOIN_POLICY_POLICY_H
#define BITCOIN_POLICY_POLICY_H

#include "consensus/consensus.h"
#include "script/interpreter.h"
#include "script/standard.h"

#include <string>

class CCoinsViewCache;

/** Default for -blockmaxsize, which controls the maximum size of block the mining code will create **/
static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 2000000;
/** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 0;
/** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/
static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000;
/** The maximum weight (size in bytes) for transactions we're willing to relay/mine */
static const unsigned int MAX_STANDARD_TX_WEIGHT = 100000;
/** Maximum number of signature check operations in an IsStandard() P2SH script */
static const unsigned int MAX_P2SH_SIGOPS = 15;
/** The maximum number of sigops we're willing to relay/mine in a single tx */
static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
/** Default for -maxmempool, maximum megabytes of mempool memory usage */
static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 5;
/** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/
static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000;
/** Default for -bytespersigop */
static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
/** Min feerate for defining dust. Historically this has been the same as the
 * minRelayTxFee, however changing the dust limit changes which transactions are
 * standard and should be done with care and ideally rarely. It makes sense to
 * only increase the dust limit after prior releases were already not creating
 * outputs below the new threshold */
static const unsigned int DUST_RELAY_TX_FEE = 100000;
/**
 * Standard script verification flags that standard transactions will comply
 * with. However scripts violating these flags may still be present in valid
 * blocks and we must accept those blocks.
 */
static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
                                                         SCRIPT_VERIFY_DERSIG |
                                                         SCRIPT_VERIFY_STRICTENC |
                                                         SCRIPT_VERIFY_MINIMALDATA |
                                                         SCRIPT_VERIFY_NULLDUMMY |
                                                         SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
                                                         SCRIPT_VERIFY_CLEANSTACK |
                                                         SCRIPT_VERIFY_NULLFAIL |
                                                         SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
                                                         SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
                                                         SCRIPT_VERIFY_LOW_S;

/** For convenience, standard but not mandatory verify flags. */
static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;

/** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */
static const unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
                                                           LOCKTIME_MEDIAN_TIME_PAST;

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

extern CFeeRate incrementalRelayFee;
extern CFeeRate dustRelayFee;
extern unsigned int nBytesPerSigOp;

/** Compute the virtual transaction size (weight reinterpreted as bytes). */
int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost);
int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost = 0);

#endif // BITCOIN_POLICY_POLICY_H