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0f4bc63585
The txdownload_impl is similar but allows us to check specific invariants within its implementation. It will also change a lot more than the external interface (txdownloadman) will, so we will add more to this target later.
118 lines
4 KiB
C++
118 lines
4 KiB
C++
// Copyright (c) 2021-2022 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_TXORPHANAGE_H
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#define BITCOIN_TXORPHANAGE_H
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#include <net.h>
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#include <primitives/block.h>
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#include <primitives/transaction.h>
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#include <sync.h>
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#include <util/time.h>
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#include <map>
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#include <set>
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/** Expiration time for orphan transactions */
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static constexpr auto ORPHAN_TX_EXPIRE_TIME{20min};
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/** Minimum time between orphan transactions expire time checks */
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static constexpr auto ORPHAN_TX_EXPIRE_INTERVAL{5min};
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/** A class to track orphan transactions (failed on TX_MISSING_INPUTS)
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* Since we cannot distinguish orphans from bad transactions with
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* non-existent inputs, we heavily limit the number of orphans
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* we keep and the duration we keep them for.
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* Not thread-safe. Requires external synchronization.
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*/
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class TxOrphanage {
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public:
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/** Add a new orphan transaction */
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bool AddTx(const CTransactionRef& tx, NodeId peer);
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/** Check if we already have an orphan transaction (by wtxid only) */
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bool HaveTx(const Wtxid& wtxid) const;
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/** Extract a transaction from a peer's work set
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* Returns nullptr if there are no transactions to work on.
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* Otherwise returns the transaction reference, and removes
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* it from the work set.
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*/
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CTransactionRef GetTxToReconsider(NodeId peer);
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/** Erase an orphan by wtxid */
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int EraseTx(const Wtxid& wtxid);
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/** Erase all orphans announced by a peer (eg, after that peer disconnects) */
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void EraseForPeer(NodeId peer);
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/** Erase all orphans included in or invalidated by a new block */
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void EraseForBlock(const CBlock& block);
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/** Limit the orphanage to the given maximum */
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void LimitOrphans(unsigned int max_orphans, FastRandomContext& rng);
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/** Add any orphans that list a particular tx as a parent into the from peer's work set */
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void AddChildrenToWorkSet(const CTransaction& tx);
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/** Does this peer have any work to do? */
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bool HaveTxToReconsider(NodeId peer);
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/** Get all children that spend from this tx and were received from nodeid. Sorted from most
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* recent to least recent. */
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std::vector<CTransactionRef> GetChildrenFromSamePeer(const CTransactionRef& parent, NodeId nodeid) const;
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/** Get all children that spend from this tx but were not received from nodeid. Also return
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* which peer provided each tx. */
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std::vector<std::pair<CTransactionRef, NodeId>> GetChildrenFromDifferentPeer(const CTransactionRef& parent, NodeId nodeid) const;
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/** Return how many entries exist in the orphange */
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size_t Size() const
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{
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return m_orphans.size();
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}
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/** Allows providing orphan information externally */
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struct OrphanTxBase {
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CTransactionRef tx;
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NodeId fromPeer;
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NodeSeconds nTimeExpire;
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};
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std::vector<OrphanTxBase> GetOrphanTransactions() const;
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protected:
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struct OrphanTx : public OrphanTxBase {
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size_t list_pos;
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};
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/** Map from wtxid to orphan transaction record. Limited by
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* -maxorphantx/DEFAULT_MAX_ORPHAN_TRANSACTIONS */
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std::map<Wtxid, OrphanTx> m_orphans;
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/** Which peer provided the orphans that need to be reconsidered */
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std::map<NodeId, std::set<Wtxid>> m_peer_work_set;
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using OrphanMap = decltype(m_orphans);
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struct IteratorComparator
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{
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template<typename I>
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bool operator()(const I& a, const I& b) const
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{
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return a->first < b->first;
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}
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};
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/** Index from the parents' COutPoint into the m_orphans. Used
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* to remove orphan transactions from the m_orphans */
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std::map<COutPoint, std::set<OrphanMap::iterator, IteratorComparator>> m_outpoint_to_orphan_it;
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/** Orphan transactions in vector for quick random eviction */
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std::vector<OrphanMap::iterator> m_orphan_list;
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/** Timestamp for the next scheduled sweep of expired orphans */
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NodeSeconds m_next_sweep{0s};
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};
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#endif // BITCOIN_TXORPHANAGE_H
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