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txgraph: Add ability to configure maximum cluster size/weight (feature)

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This is integrated with the oversized property: the graph is oversized when
any connected component within it contains more than the cluster count limit
many transactions, or when their combined size/weight exceeds the cluster size
limit.

It becomes disallowed to call AddTransaction with a size larger than this limit,
though this limit will be lifted in the next commit.

In addition, SetTransactionFeeRate becomes SetTransactionFee, so that we do not
need to deal with the case that a call to this function might affect the
oversizedness.
This commit is contained in:
Pieter Wuille
2024-12-17 08:13:25 -05:00
parent a92e8b10a5
commit c4287b9b71
3 changed files with 68 additions and 25 deletions
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15
src/txgraph.h
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@@ -63,10 +63,10 @@ public:
/** Virtual destructor, so inheriting is safe. */
virtual ~TxGraph() = default;
/** Construct a new transaction with the specified feerate, and return a Ref to it.
* If a staging graph exists, the new transaction is only created there. In all
* further calls, only Refs created by AddTransaction() are allowed to be passed to this
* TxGraph object (or empty Ref objects). Ref objects may outlive the TxGraph they were
* created for. */
* If a staging graph exists, the new transaction is only created there. feerate.size must be
* strictly positive, and cannot exceed the graph's max cluster size. In all further calls,
* only Refs created by AddTransaction() are allowed to be passed to this TxGraph object (or
* empty Ref objects). Ref objects may outlive the TxGraph they were created for. */
[[nodiscard]] virtual Ref AddTransaction(const FeePerWeight& feerate) noexcept = 0;
/** Remove the specified transaction. If a staging graph exists, the removal only happens
* there. This is a no-op if the transaction was already removed.
@@ -240,8 +240,9 @@ public:
};
};
/** Construct a new TxGraph with the specified limit on transactions within a cluster. That
* number cannot exceed MAX_CLUSTER_COUNT_LIMIT. */
std::unique_ptr<TxGraph> MakeTxGraph(unsigned max_cluster_count) noexcept;
/** Construct a new TxGraph with the specified limit on the number of transactions within a cluster,
* and on the sum of transaction sizes within a cluster. max_cluster_count cannot exceed
* MAX_CLUSTER_COUNT_LIMIT. */
std::unique_ptr<TxGraph> MakeTxGraph(unsigned max_cluster_count, uint64_t max_cluster_size) noexcept;
#endif // BITCOIN_TXGRAPH_H