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45 lines
1.9 KiB
C++
45 lines
1.9 KiB
C++
// Copyright (c) 2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_POLICY_PACKAGES_H
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#define BITCOIN_POLICY_PACKAGES_H
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#include <consensus/validation.h>
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#include <policy/policy.h>
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#include <primitives/transaction.h>
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#include <vector>
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/** Default maximum number of transactions in a package. */
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static constexpr uint32_t MAX_PACKAGE_COUNT{25};
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/** Default maximum total virtual size of transactions in a package in KvB. */
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static constexpr uint32_t MAX_PACKAGE_SIZE{101};
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static_assert(MAX_PACKAGE_SIZE * 1000 >= MAX_STANDARD_TX_SIZE);
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/** A "reason" why a package was invalid. It may be that one or more of the included
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* transactions is invalid or the package itself violates our rules.
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* We don't distinguish between consensus and policy violations right now.
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*/
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enum class PackageValidationResult {
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PCKG_RESULT_UNSET = 0, //!< Initial value. The package has not yet been rejected.
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PCKG_POLICY, //!< The package itself is invalid (e.g. too many transactions).
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PCKG_TX, //!< At least one tx is invalid.
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};
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/** A package is an ordered list of transactions. The transactions cannot conflict with (spend the
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* same inputs as) one another. */
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using Package = std::vector<CTransactionRef>;
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class PackageValidationState : public ValidationState<PackageValidationResult> {};
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/** Context-free package policy checks:
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* 1. The number of transactions cannot exceed MAX_PACKAGE_COUNT.
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* 2. The total virtual size cannot exceed MAX_PACKAGE_SIZE.
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* 3. If any dependencies exist between transactions, parents must appear before children.
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* 4. Transactions cannot conflict, i.e., spend the same inputs.
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*/
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bool CheckPackage(const Package& txns, PackageValidationState& state);
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#endif // BITCOIN_POLICY_PACKAGES_H
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