policy.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin 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 <policy/feerate.h>
#include <script/interpreter.h>
#include <script/standard.h>

#include <string>

class CCoinsViewCache;
class CTxOut;

static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000;
static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82;
static const unsigned int MAX_P2SH_SIGOPS = 15;
static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000;
static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
static const bool DEFAULT_PERMIT_BAREMULTISIG = true;
static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100;
static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80;
static const unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE = 80;
static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600;
static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650;
static const unsigned int DUST_RELAY_TX_FEE = 3000;
static constexpr 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_MINIMALIF |
                                                             SCRIPT_VERIFY_NULLFAIL |
                                                             SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
                                                             SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
                                                             SCRIPT_VERIFY_LOW_S |
                                                             SCRIPT_VERIFY_WITNESS |
                                                             SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM |
                                                             SCRIPT_VERIFY_WITNESS_PUBKEYTYPE |
                                                             SCRIPT_VERIFY_CONST_SCRIPTCODE |
                                                             SCRIPT_VERIFY_TAPROOT |
                                                             SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_TAPROOT_VERSION |
                                                             SCRIPT_VERIFY_DISCOURAGE_OP_SUCCESS |
                                                             SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_PUBKEYTYPE;

static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;

static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
                                                               LOCKTIME_MEDIAN_TIME_PAST;

CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);

bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);

bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType);


// Changing the default transaction version requires a two step process: first
// adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later
// allowing the new transaction version in the wallet/RPC.
static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2};

bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason);
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, bool taproot_active);
bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);

int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop);
int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);

static inline int64_t GetVirtualTransactionSize(const CTransaction& tx)
{
    return GetVirtualTransactionSize(tx, 0, 0);
}

static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx)
{
    return GetVirtualTransactionInputSize(tx, 0, 0);
}

#endif // BITCOIN_POLICY_POLICY_H