LCOV - code coverage report
Current view: top level - src - txrequest.cpp (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 18 300 6.0 %
Date: 2023-11-12 01:39:15 Functions: 6 81 7.4 %
Branches: 7 244 2.9 %

           Branch data     Line data    Source code
       1                 :            : // Copyright (c) 2020-2021 The Bitcoin Core developers
       2                 :            : // Distributed under the MIT software license, see the accompanying
       3                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :            : 
       5                 :            : #include <txrequest.h>
       6                 :            : 
       7                 :            : #include <crypto/siphash.h>
       8                 :            : #include <net.h>
       9                 :            : #include <primitives/transaction.h>
      10                 :            : #include <random.h>
      11                 :            : #include <uint256.h>
      12                 :            : 
      13                 :            : #include <boost/multi_index/indexed_by.hpp>
      14                 :            : #include <boost/multi_index/ordered_index.hpp>
      15                 :            : #include <boost/multi_index/sequenced_index.hpp>
      16                 :            : #include <boost/multi_index/tag.hpp>
      17         [ +  - ]:          2 : #include <boost/multi_index_container.hpp>
      18         [ +  - ]:          2 : #include <boost/tuple/tuple.hpp>
      19                 :            : 
      20                 :            : #include <chrono>
      21                 :            : #include <unordered_map>
      22                 :            : #include <utility>
      23                 :            : 
      24                 :            : #include <assert.h>
      25                 :            : 
      26                 :            : namespace {
      27                 :            : 
      28                 :            : /** The various states a (txhash,peer) pair can be in.
      29                 :            :  *
      30                 :            :  * Note that CANDIDATE is split up into 3 substates (DELAYED, BEST, READY), allowing more efficient implementation.
      31                 :            :  * Also note that the sorting order of ByTxHashView relies on the specific order of values in this enum.
      32                 :            :  *
      33                 :            :  * Expected behaviour is:
      34                 :            :  *   - When first announced by a peer, the state is CANDIDATE_DELAYED until reqtime is reached.
      35                 :            :  *   - Announcements that have reached their reqtime but not been requested will be either CANDIDATE_READY or
      36                 :            :  *     CANDIDATE_BEST. Neither of those has an expiration time; they remain in that state until they're requested or
      37                 :            :  *     no longer needed. CANDIDATE_READY announcements are promoted to CANDIDATE_BEST when they're the best one left.
      38                 :            :  *   - When requested, an announcement will be in state REQUESTED until expiry is reached.
      39                 :            :  *   - If expiry is reached, or the peer replies to the request (either with NOTFOUND or the tx), the state becomes
      40                 :            :  *     COMPLETED.
      41                 :            :  */
      42                 :            : enum class State : uint8_t {
      43                 :            :     /** A CANDIDATE announcement whose reqtime is in the future. */
      44                 :            :     CANDIDATE_DELAYED,
      45                 :            :     /** A CANDIDATE announcement that's not CANDIDATE_DELAYED or CANDIDATE_BEST. */
      46                 :            :     CANDIDATE_READY,
      47                 :            :     /** The best CANDIDATE for a given txhash; only if there is no REQUESTED announcement already for that txhash.
      48                 :            :      *  The CANDIDATE_BEST is the highest-priority announcement among all CANDIDATE_READY (and _BEST) ones for that
      49                 :            :      *  txhash. */
      50                 :            :     CANDIDATE_BEST,
      51                 :            :     /** A REQUESTED announcement. */
      52                 :            :     REQUESTED,
      53                 :            :     /** A COMPLETED announcement. */
      54                 :            :     COMPLETED,
      55                 :            : };
      56                 :            : 
      57                 :            : //! Type alias for sequence numbers.
      58                 :            : using SequenceNumber = uint64_t;
      59                 :            : 
      60                 :            : /** An announcement. This is the data we track for each txid or wtxid that is announced to us by each peer. */
      61                 :            : struct Announcement {
      62                 :            :     /** Txid or wtxid that was announced. */
      63                 :            :     const uint256 m_txhash;
      64                 :            :     /** For CANDIDATE_{DELAYED,BEST,READY} the reqtime; for REQUESTED the expiry. */
      65                 :            :     std::chrono::microseconds m_time;
      66                 :            :     /** What peer the request was from. */
      67                 :            :     const NodeId m_peer;
      68                 :            :     /** What sequence number this announcement has. */
      69                 :            :     const SequenceNumber m_sequence : 59;
      70                 :            :     /** Whether the request is preferred. */
      71                 :            :     const bool m_preferred : 1;
      72                 :            :     /** Whether this is a wtxid request. */
      73                 :            :     const bool m_is_wtxid : 1;
      74                 :            : 
      75                 :            :     /** What state this announcement is in. */
      76                 :            :     State m_state : 3;
      77                 :          0 :     State GetState() const { return m_state; }
      78                 :          0 :     void SetState(State state) { m_state = state; }
      79                 :            : 
      80                 :            :     /** Whether this announcement is selected. There can be at most 1 selected peer per txhash. */
      81                 :          0 :     bool IsSelected() const
      82                 :            :     {
      83 [ +  - ][ #  # ]:          2 :         return GetState() == State::CANDIDATE_BEST || GetState() == State::REQUESTED;
      84                 :            :     }
      85                 :            : 
      86                 :            :     /** Whether this announcement is waiting for a certain time to pass. */
      87                 :          0 :     bool IsWaiting() const
      88                 :            :     {
      89         [ #  # ]:          0 :         return GetState() == State::REQUESTED || GetState() == State::CANDIDATE_DELAYED;
      90                 :            :     }
      91                 :            : 
      92                 :            :     /** Whether this announcement can feasibly be selected if the current IsSelected() one disappears. */
      93                 :          0 :     bool IsSelectable() const
      94                 :            :     {
      95         [ #  # ]:          0 :         return GetState() == State::CANDIDATE_READY || GetState() == State::CANDIDATE_BEST;
      96                 :            :     }
      97                 :            : 
      98                 :            :     /** Construct a new announcement from scratch, initially in CANDIDATE_DELAYED state. */
      99                 :          0 :     Announcement(const GenTxid& gtxid, NodeId peer, bool preferred, std::chrono::microseconds reqtime,
     100                 :            :         SequenceNumber sequence) :
     101                 :          0 :         m_txhash(gtxid.GetHash()), m_time(reqtime), m_peer(peer), m_sequence(sequence), m_preferred(preferred),
     102                 :          0 :         m_is_wtxid{gtxid.IsWtxid()}, m_state{State::CANDIDATE_DELAYED} {}
     103                 :            : };
     104                 :            : 
     105                 :            : //! Type alias for priorities.
     106                 :            : using Priority = uint64_t;
     107                 :            : 
     108                 :            : /** A functor with embedded salt that computes priority of an announcement.
     109                 :            :  *
     110                 :            :  * Higher priorities are selected first.
     111                 :            :  */
     112                 :            : class PriorityComputer {
     113                 :            :     const uint64_t m_k0, m_k1;
     114                 :            : public:
     115                 :          1 :     explicit PriorityComputer(bool deterministic) :
     116         [ -  + ]:          1 :         m_k0{deterministic ? 0 : GetRand(0xFFFFFFFFFFFFFFFF)},
     117         [ -  + ]:          1 :         m_k1{deterministic ? 0 : GetRand(0xFFFFFFFFFFFFFFFF)} {}
     118                 :            : 
     119                 :          0 :     Priority operator()(const uint256& txhash, NodeId peer, bool preferred) const
     120                 :            :     {
     121                 :          0 :         uint64_t low_bits = CSipHasher(m_k0, m_k1).Write(txhash).Write(peer).Finalize() >> 1;
     122                 :          0 :         return low_bits | uint64_t{preferred} << 63;
     123                 :            :     }
     124                 :            : 
     125                 :          0 :     Priority operator()(const Announcement& ann) const
     126                 :            :     {
     127                 :          0 :         return operator()(ann.m_txhash, ann.m_peer, ann.m_preferred);
     128                 :            :     }
     129                 :            : };
     130                 :            : 
     131                 :            : // Definitions for the 3 indexes used in the main data structure.
     132                 :            : //
     133                 :            : // Each index has a By* type to identify it, a By*View data type to represent the view of announcement it is sorted
     134                 :            : // by, and an By*ViewExtractor type to convert an announcement into the By*View type.
     135                 :            : // See https://www.boost.org/doc/libs/1_58_0/libs/multi_index/doc/reference/key_extraction.html#key_extractors
     136                 :            : // for more information about the key extraction concept.
     137                 :            : 
     138                 :            : // The ByPeer index is sorted by (peer, state == CANDIDATE_BEST, txhash)
     139                 :            : //
     140                 :            : // Uses:
     141                 :            : // * Looking up existing announcements by peer/txhash, by checking both (peer, false, txhash) and
     142                 :            : //   (peer, true, txhash).
     143                 :            : // * Finding all CANDIDATE_BEST announcements for a given peer in GetRequestable.
     144                 :            : struct ByPeer {};
     145                 :            : using ByPeerView = std::tuple<NodeId, bool, const uint256&>;
     146                 :            : struct ByPeerViewExtractor
     147                 :            : {
     148                 :            :     using result_type = ByPeerView;
     149                 :          0 :     result_type operator()(const Announcement& ann) const
     150                 :            :     {
     151                 :          0 :         return ByPeerView{ann.m_peer, ann.GetState() == State::CANDIDATE_BEST, ann.m_txhash};
     152                 :            :     }
     153                 :            : };
     154                 :            : 
     155                 :            : // The ByTxHash index is sorted by (txhash, state, priority).
     156                 :            : //
     157                 :            : // Note: priority == 0 whenever state != CANDIDATE_READY.
     158                 :            : //
     159                 :            : // Uses:
     160                 :            : // * Deleting all announcements with a given txhash in ForgetTxHash.
     161                 :            : // * Finding the best CANDIDATE_READY to convert to CANDIDATE_BEST, when no other CANDIDATE_READY or REQUESTED
     162                 :            : //   announcement exists for that txhash.
     163                 :            : // * Determining when no more non-COMPLETED announcements for a given txhash exist, so the COMPLETED ones can be
     164                 :            : //   deleted.
     165                 :            : struct ByTxHash {};
     166                 :            : using ByTxHashView = std::tuple<const uint256&, State, Priority>;
     167                 :            : class ByTxHashViewExtractor {
     168                 :            :     const PriorityComputer& m_computer;
     169                 :            : public:
     170                 :          1 :     explicit ByTxHashViewExtractor(const PriorityComputer& computer) : m_computer(computer) {}
     171                 :            :     using result_type = ByTxHashView;
     172                 :          0 :     result_type operator()(const Announcement& ann) const
     173                 :            :     {
     174         [ #  # ]:          0 :         const Priority prio = (ann.GetState() == State::CANDIDATE_READY) ? m_computer(ann) : 0;
     175                 :          0 :         return ByTxHashView{ann.m_txhash, ann.GetState(), prio};
     176                 :            :     }
     177                 :            : };
     178                 :            : 
     179                 :            : enum class WaitState {
     180                 :            :     //! Used for announcements that need efficient testing of "is their timestamp in the future?".
     181                 :            :     FUTURE_EVENT,
     182                 :            :     //! Used for announcements whose timestamp is not relevant.
     183                 :            :     NO_EVENT,
     184                 :            :     //! Used for announcements that need efficient testing of "is their timestamp in the past?".
     185                 :            :     PAST_EVENT,
     186                 :            : };
     187                 :            : 
     188                 :          0 : WaitState GetWaitState(const Announcement& ann)
     189                 :            : {
     190         [ #  # ]:          0 :     if (ann.IsWaiting()) return WaitState::FUTURE_EVENT;
     191         [ #  # ]:          0 :     if (ann.IsSelectable()) return WaitState::PAST_EVENT;
     192                 :          0 :     return WaitState::NO_EVENT;
     193                 :          0 : }
     194                 :            : 
     195                 :            : // The ByTime index is sorted by (wait_state, time).
     196                 :            : //
     197                 :            : // All announcements with a timestamp in the future can be found by iterating the index forward from the beginning.
     198                 :            : // All announcements with a timestamp in the past can be found by iterating the index backwards from the end.
     199                 :            : //
     200                 :            : // Uses:
     201                 :            : // * Finding CANDIDATE_DELAYED announcements whose reqtime has passed, and REQUESTED announcements whose expiry has
     202                 :            : //   passed.
     203                 :            : // * Finding CANDIDATE_READY/BEST announcements whose reqtime is in the future (when the clock time went backwards).
     204                 :            : struct ByTime {};
     205                 :            : using ByTimeView = std::pair<WaitState, std::chrono::microseconds>;
     206                 :            : struct ByTimeViewExtractor
     207                 :            : {
     208                 :            :     using result_type = ByTimeView;
     209                 :          0 :     result_type operator()(const Announcement& ann) const
     210                 :            :     {
     211                 :          0 :         return ByTimeView{GetWaitState(ann), ann.m_time};
     212                 :            :     }
     213                 :            : };
     214                 :            : 
     215                 :            : /** Data type for the main data structure (Announcement objects with ByPeer/ByTxHash/ByTime indexes). */
     216                 :            : using Index = boost::multi_index_container<
     217                 :            :     Announcement,
     218                 :            :     boost::multi_index::indexed_by<
     219                 :            :         boost::multi_index::ordered_unique<boost::multi_index::tag<ByPeer>, ByPeerViewExtractor>,
     220                 :            :         boost::multi_index::ordered_non_unique<boost::multi_index::tag<ByTxHash>, ByTxHashViewExtractor>,
     221                 :            :         boost::multi_index::ordered_non_unique<boost::multi_index::tag<ByTime>, ByTimeViewExtractor>
     222                 :            :     >
     223                 :            : >;
     224                 :            : 
     225                 :            : /** Helper type to simplify syntax of iterator types. */
     226                 :            : template<typename Tag>
     227                 :            : using Iter = typename Index::index<Tag>::type::iterator;
     228                 :            : 
     229                 :            : /** Per-peer statistics object. */
     230                 :          0 : struct PeerInfo {
     231                 :          0 :     size_t m_total = 0; //!< Total number of announcements for this peer.
     232                 :          0 :     size_t m_completed = 0; //!< Number of COMPLETED announcements for this peer.
     233                 :          0 :     size_t m_requested = 0; //!< Number of REQUESTED announcements for this peer.
     234                 :            : };
     235                 :            : 
     236                 :            : /** Per-txhash statistics object. Only used for sanity checking. */
     237                 :          0 : struct TxHashInfo
     238                 :            : {
     239                 :            :     //! Number of CANDIDATE_DELAYED announcements for this txhash.
     240                 :          0 :     size_t m_candidate_delayed = 0;
     241                 :            :     //! Number of CANDIDATE_READY announcements for this txhash.
     242                 :          0 :     size_t m_candidate_ready = 0;
     243                 :            :     //! Number of CANDIDATE_BEST announcements for this txhash (at most one).
     244                 :          0 :     size_t m_candidate_best = 0;
     245                 :            :     //! Number of REQUESTED announcements for this txhash (at most one; mutually exclusive with CANDIDATE_BEST).
     246                 :          0 :     size_t m_requested = 0;
     247                 :            :     //! The priority of the CANDIDATE_BEST announcement if one exists, or max() otherwise.
     248                 :          0 :     Priority m_priority_candidate_best = std::numeric_limits<Priority>::max();
     249                 :            :     //! The highest priority of all CANDIDATE_READY announcements (or min() if none exist).
     250                 :          0 :     Priority m_priority_best_candidate_ready = std::numeric_limits<Priority>::min();
     251                 :            :     //! All peers we have an announcement for this txhash for.
     252                 :            :     std::vector<NodeId> m_peers;
     253                 :            : };
     254                 :            : 
     255                 :            : /** Compare two PeerInfo objects. Only used for sanity checking. */
     256                 :          0 : bool operator==(const PeerInfo& a, const PeerInfo& b)
     257                 :            : {
     258                 :          0 :     return std::tie(a.m_total, a.m_completed, a.m_requested) ==
     259                 :          0 :            std::tie(b.m_total, b.m_completed, b.m_requested);
     260                 :            : };
     261                 :            : 
     262                 :            : /** (Re)compute the PeerInfo map from the index. Only used for sanity checking. */
     263                 :          0 : std::unordered_map<NodeId, PeerInfo> RecomputePeerInfo(const Index& index)
     264                 :            : {
     265                 :          0 :     std::unordered_map<NodeId, PeerInfo> ret;
     266 [ #  # ][ #  # ]:          0 :     for (const Announcement& ann : index) {
                 [ #  # ]
     267         [ #  # ]:          0 :         PeerInfo& info = ret[ann.m_peer];
     268                 :          0 :         ++info.m_total;
     269                 :          0 :         info.m_requested += (ann.GetState() == State::REQUESTED);
     270                 :          0 :         info.m_completed += (ann.GetState() == State::COMPLETED);
     271                 :            :     }
     272                 :          0 :     return ret;
     273         [ #  # ]:          0 : }
     274                 :            : 
     275                 :            : /** Compute the TxHashInfo map. Only used for sanity checking. */
     276                 :          0 : std::map<uint256, TxHashInfo> ComputeTxHashInfo(const Index& index, const PriorityComputer& computer)
     277                 :            : {
     278                 :          0 :     std::map<uint256, TxHashInfo> ret;
     279 [ #  # ][ #  # ]:          0 :     for (const Announcement& ann : index) {
                 [ #  # ]
     280         [ #  # ]:          0 :         TxHashInfo& info = ret[ann.m_txhash];
     281                 :            :         // Classify how many announcements of each state we have for this txhash.
     282                 :          0 :         info.m_candidate_delayed += (ann.GetState() == State::CANDIDATE_DELAYED);
     283                 :          0 :         info.m_candidate_ready += (ann.GetState() == State::CANDIDATE_READY);
     284                 :          0 :         info.m_candidate_best += (ann.GetState() == State::CANDIDATE_BEST);
     285                 :          0 :         info.m_requested += (ann.GetState() == State::REQUESTED);
     286                 :            :         // And track the priority of the best CANDIDATE_READY/CANDIDATE_BEST announcements.
     287         [ #  # ]:          0 :         if (ann.GetState() == State::CANDIDATE_BEST) {
     288         [ #  # ]:          0 :             info.m_priority_candidate_best = computer(ann);
     289                 :          0 :         }
     290         [ #  # ]:          0 :         if (ann.GetState() == State::CANDIDATE_READY) {
     291 [ #  # ][ #  # ]:          0 :             info.m_priority_best_candidate_ready = std::max(info.m_priority_best_candidate_ready, computer(ann));
     292                 :          0 :         }
     293                 :            :         // Also keep track of which peers this txhash has an announcement for (so we can detect duplicates).
     294         [ #  # ]:          0 :         info.m_peers.push_back(ann.m_peer);
     295                 :            :     }
     296                 :          0 :     return ret;
     297         [ #  # ]:          0 : }
     298                 :            : 
     299                 :          0 : GenTxid ToGenTxid(const Announcement& ann)
     300                 :            : {
     301         [ #  # ]:          0 :     return ann.m_is_wtxid ? GenTxid::Wtxid(ann.m_txhash) : GenTxid::Txid(ann.m_txhash);
     302                 :            : }
     303                 :            : 
     304                 :            : }  // namespace
     305                 :            : 
     306                 :            : /** Actual implementation for TxRequestTracker's data structure. */
     307                 :          0 : class TxRequestTracker::Impl {
     308                 :            :     //! The current sequence number. Increases for every announcement. This is used to sort txhashes returned by
     309                 :            :     //! GetRequestable in announcement order.
     310                 :          1 :     SequenceNumber m_current_sequence{0};
     311                 :            : 
     312                 :            :     //! This tracker's priority computer.
     313                 :            :     const PriorityComputer m_computer;
     314                 :            : 
     315                 :            :     //! This tracker's main data structure. See SanityCheck() for the invariants that apply to it.
     316                 :            :     Index m_index;
     317                 :            : 
     318                 :            :     //! Map with this tracker's per-peer statistics.
     319                 :            :     std::unordered_map<NodeId, PeerInfo> m_peerinfo;
     320                 :            : 
     321                 :            : public:
     322                 :          0 :     void SanityCheck() const
     323                 :            :     {
     324                 :            :         // Recompute m_peerdata from m_index. This verifies the data in it as it should just be caching statistics
     325                 :            :         // on m_index. It also verifies the invariant that no PeerInfo announcements with m_total==0 exist.
     326 [ #  # ][ #  # ]:          0 :         assert(m_peerinfo == RecomputePeerInfo(m_index));
     327                 :            : 
     328                 :            :         // Calculate per-txhash statistics from m_index, and validate invariants.
     329         [ #  # ]:          0 :         for (auto& item : ComputeTxHashInfo(m_index, m_computer)) {
     330                 :          0 :             TxHashInfo& info = item.second;
     331                 :            : 
     332                 :            :             // Cannot have only COMPLETED peer (txhash should have been forgotten already)
     333         [ #  # ]:          0 :             assert(info.m_candidate_delayed + info.m_candidate_ready + info.m_candidate_best + info.m_requested > 0);
     334                 :            : 
     335                 :            :             // Can have at most 1 CANDIDATE_BEST/REQUESTED peer
     336         [ #  # ]:          0 :             assert(info.m_candidate_best + info.m_requested <= 1);
     337                 :            : 
     338                 :            :             // If there are any CANDIDATE_READY announcements, there must be exactly one CANDIDATE_BEST or REQUESTED
     339                 :            :             // announcement.
     340         [ #  # ]:          0 :             if (info.m_candidate_ready > 0) {
     341         [ #  # ]:          0 :                 assert(info.m_candidate_best + info.m_requested == 1);
     342                 :          0 :             }
     343                 :            : 
     344                 :            :             // If there is both a CANDIDATE_READY and a CANDIDATE_BEST announcement, the CANDIDATE_BEST one must be
     345                 :            :             // at least as good (equal or higher priority) as the best CANDIDATE_READY.
     346 [ #  # ][ #  # ]:          0 :             if (info.m_candidate_ready && info.m_candidate_best) {
     347         [ #  # ]:          0 :                 assert(info.m_priority_candidate_best >= info.m_priority_best_candidate_ready);
     348                 :          0 :             }
     349                 :            : 
     350                 :            :             // No txhash can have been announced by the same peer twice.
     351         [ #  # ]:          0 :             std::sort(info.m_peers.begin(), info.m_peers.end());
     352 [ #  # ][ #  # ]:          0 :             assert(std::adjacent_find(info.m_peers.begin(), info.m_peers.end()) == info.m_peers.end());
     353                 :            :         }
     354                 :          0 :     }
     355                 :            : 
     356                 :          0 :     void PostGetRequestableSanityCheck(std::chrono::microseconds now) const
     357                 :            :     {
     358         [ #  # ]:          0 :         for (const Announcement& ann : m_index) {
     359         [ #  # ]:          0 :             if (ann.IsWaiting()) {
     360                 :            :                 // REQUESTED and CANDIDATE_DELAYED must have a time in the future (they should have been converted
     361                 :            :                 // to COMPLETED/CANDIDATE_READY respectively).
     362         [ #  # ]:          0 :                 assert(ann.m_time > now);
     363         [ #  # ]:          0 :             } else if (ann.IsSelectable()) {
     364                 :            :                 // CANDIDATE_READY and CANDIDATE_BEST cannot have a time in the future (they should have remained
     365                 :            :                 // CANDIDATE_DELAYED, or should have been converted back to it if time went backwards).
     366         [ #  # ]:          0 :                 assert(ann.m_time <= now);
     367                 :          0 :             }
     368                 :            :         }
     369                 :          0 :     }
     370                 :            : 
     371                 :            : private:
     372                 :            :     //! Wrapper around Index::...::erase that keeps m_peerinfo up to date.
     373                 :            :     template<typename Tag>
     374                 :          0 :     Iter<Tag> Erase(Iter<Tag> it)
     375                 :            :     {
     376                 :          0 :         auto peerit = m_peerinfo.find(it->m_peer);
     377                 :          0 :         peerit->second.m_completed -= it->GetState() == State::COMPLETED;
     378                 :          0 :         peerit->second.m_requested -= it->GetState() == State::REQUESTED;
     379 [ #  # ][ #  # ]:          0 :         if (--peerit->second.m_total == 0) m_peerinfo.erase(peerit);
     380                 :          0 :         return m_index.get<Tag>().erase(it);
     381                 :            :     }
     382                 :            : 
     383                 :            :     //! Wrapper around Index::...::modify that keeps m_peerinfo up to date.
     384                 :            :     template<typename Tag, typename Modifier>
     385                 :          0 :     void Modify(Iter<Tag> it, Modifier modifier)
     386                 :            :     {
     387                 :          0 :         auto peerit = m_peerinfo.find(it->m_peer);
     388                 :          0 :         peerit->second.m_completed -= it->GetState() == State::COMPLETED;
     389                 :          0 :         peerit->second.m_requested -= it->GetState() == State::REQUESTED;
     390                 :          0 :         m_index.get<Tag>().modify(it, std::move(modifier));
     391                 :          0 :         peerit->second.m_completed += it->GetState() == State::COMPLETED;
     392                 :          0 :         peerit->second.m_requested += it->GetState() == State::REQUESTED;
     393                 :          0 :     }
     394                 :            : 
     395                 :            :     //! Convert a CANDIDATE_DELAYED announcement into a CANDIDATE_READY. If this makes it the new best
     396                 :            :     //! CANDIDATE_READY (and no REQUESTED exists) and better than the CANDIDATE_BEST (if any), it becomes the new
     397                 :            :     //! CANDIDATE_BEST.
     398                 :          0 :     void PromoteCandidateReady(Iter<ByTxHash> it)
     399                 :            :     {
     400         [ #  # ]:          0 :         assert(it != m_index.get<ByTxHash>().end());
     401         [ #  # ]:          0 :         assert(it->GetState() == State::CANDIDATE_DELAYED);
     402                 :            :         // Convert CANDIDATE_DELAYED to CANDIDATE_READY first.
     403                 :          0 :         Modify<ByTxHash>(it, [](Announcement& ann){ ann.SetState(State::CANDIDATE_READY); });
     404                 :            :         // The following code relies on the fact that the ByTxHash is sorted by txhash, and then by state (first
     405                 :            :         // _DELAYED, then _READY, then _BEST/REQUESTED). Within the _READY announcements, the best one (highest
     406                 :            :         // priority) comes last. Thus, if an existing _BEST exists for the same txhash that this announcement may
     407                 :            :         // be preferred over, it must immediately follow the newly created _READY.
     408                 :          0 :         auto it_next = std::next(it);
     409 [ #  # ][ #  # ]:          0 :         if (it_next == m_index.get<ByTxHash>().end() || it_next->m_txhash != it->m_txhash ||
                 [ #  # ]
     410                 :          0 :             it_next->GetState() == State::COMPLETED) {
     411                 :            :             // This is the new best CANDIDATE_READY, and there is no IsSelected() announcement for this txhash
     412                 :            :             // already.
     413                 :          0 :             Modify<ByTxHash>(it, [](Announcement& ann){ ann.SetState(State::CANDIDATE_BEST); });
     414         [ #  # ]:          0 :         } else if (it_next->GetState() == State::CANDIDATE_BEST) {
     415                 :          0 :             Priority priority_old = m_computer(*it_next);
     416                 :          0 :             Priority priority_new = m_computer(*it);
     417         [ #  # ]:          0 :             if (priority_new > priority_old) {
     418                 :            :                 // There is a CANDIDATE_BEST announcement already, but this one is better.
     419                 :          0 :                 Modify<ByTxHash>(it_next, [](Announcement& ann){ ann.SetState(State::CANDIDATE_READY); });
     420                 :          0 :                 Modify<ByTxHash>(it, [](Announcement& ann){ ann.SetState(State::CANDIDATE_BEST); });
     421                 :          0 :             }
     422                 :          0 :         }
     423                 :          0 :     }
     424                 :            : 
     425                 :            :     //! Change the state of an announcement to something non-IsSelected(). If it was IsSelected(), the next best
     426                 :            :     //! announcement will be marked CANDIDATE_BEST.
     427                 :          0 :     void ChangeAndReselect(Iter<ByTxHash> it, State new_state)
     428                 :            :     {
     429 [ #  # ][ #  # ]:          0 :         assert(new_state == State::COMPLETED || new_state == State::CANDIDATE_DELAYED);
     430         [ #  # ]:          0 :         assert(it != m_index.get<ByTxHash>().end());
     431 [ #  # ][ #  # ]:          0 :         if (it->IsSelected() && it != m_index.get<ByTxHash>().begin()) {
     432                 :          0 :             auto it_prev = std::prev(it);
     433                 :            :             // The next best CANDIDATE_READY, if any, immediately precedes the REQUESTED or CANDIDATE_BEST
     434                 :            :             // announcement in the ByTxHash index.
     435 [ #  # ][ #  # ]:          0 :             if (it_prev->m_txhash == it->m_txhash && it_prev->GetState() == State::CANDIDATE_READY) {
     436                 :            :                 // If one such CANDIDATE_READY exists (for this txhash), convert it to CANDIDATE_BEST.
     437                 :          0 :                 Modify<ByTxHash>(it_prev, [](Announcement& ann){ ann.SetState(State::CANDIDATE_BEST); });
     438                 :          0 :             }
     439                 :          0 :         }
     440                 :          0 :         Modify<ByTxHash>(it, [new_state](Announcement& ann){ ann.SetState(new_state); });
     441                 :          0 :     }
     442                 :            : 
     443                 :            :     //! Check if 'it' is the only announcement for a given txhash that isn't COMPLETED.
     444                 :          0 :     bool IsOnlyNonCompleted(Iter<ByTxHash> it)
     445                 :            :     {
     446         [ #  # ]:          0 :         assert(it != m_index.get<ByTxHash>().end());
     447         [ #  # ]:          0 :         assert(it->GetState() != State::COMPLETED); // Not allowed to call this on COMPLETED announcements.
     448                 :            : 
     449                 :            :         // This announcement has a predecessor that belongs to the same txhash. Due to ordering, and the
     450                 :            :         // fact that 'it' is not COMPLETED, its predecessor cannot be COMPLETED here.
     451 [ #  # ][ #  # ]:          0 :         if (it != m_index.get<ByTxHash>().begin() && std::prev(it)->m_txhash == it->m_txhash) return false;
     452                 :            : 
     453                 :            :         // This announcement has a successor that belongs to the same txhash, and is not COMPLETED.
     454 [ #  # ][ #  # ]:          0 :         if (std::next(it) != m_index.get<ByTxHash>().end() && std::next(it)->m_txhash == it->m_txhash &&
                 [ #  # ]
     455                 :          0 :             std::next(it)->GetState() != State::COMPLETED) return false;
     456                 :            : 
     457                 :          0 :         return true;
     458                 :          0 :     }
     459                 :            : 
     460                 :            :     /** Convert any announcement to a COMPLETED one. If there are no non-COMPLETED announcements left for this
     461                 :            :      *  txhash, they are deleted. If this was a REQUESTED announcement, and there are other CANDIDATEs left, the
     462                 :            :      *  best one is made CANDIDATE_BEST. Returns whether the announcement still exists. */
     463                 :          0 :     bool MakeCompleted(Iter<ByTxHash> it)
     464                 :            :     {
     465         [ #  # ]:          0 :         assert(it != m_index.get<ByTxHash>().end());
     466                 :            : 
     467                 :            :         // Nothing to be done if it's already COMPLETED.
     468         [ #  # ]:          0 :         if (it->GetState() == State::COMPLETED) return true;
     469                 :            : 
     470         [ #  # ]:          0 :         if (IsOnlyNonCompleted(it)) {
     471                 :            :             // This is the last non-COMPLETED announcement for this txhash. Delete all.
     472                 :          0 :             uint256 txhash = it->m_txhash;
     473                 :          0 :             do {
     474                 :          0 :                 it = Erase<ByTxHash>(it);
     475 [ #  # ][ #  # ]:          0 :             } while (it != m_index.get<ByTxHash>().end() && it->m_txhash == txhash);
     476                 :          0 :             return false;
     477                 :            :         }
     478                 :            : 
     479                 :            :         // Mark the announcement COMPLETED, and select the next best announcement (the first CANDIDATE_READY) if
     480                 :            :         // needed.
     481                 :          0 :         ChangeAndReselect(it, State::COMPLETED);
     482                 :            : 
     483                 :          0 :         return true;
     484                 :          0 :     }
     485                 :            : 
     486                 :            :     //! Make the data structure consistent with a given point in time:
     487                 :            :     //! - REQUESTED announcements with expiry <= now are turned into COMPLETED.
     488                 :            :     //! - CANDIDATE_DELAYED announcements with reqtime <= now are turned into CANDIDATE_{READY,BEST}.
     489                 :            :     //! - CANDIDATE_{READY,BEST} announcements with reqtime > now are turned into CANDIDATE_DELAYED.
     490                 :          0 :     void SetTimePoint(std::chrono::microseconds now, std::vector<std::pair<NodeId, GenTxid>>* expired)
     491                 :            :     {
     492         [ #  # ]:          0 :         if (expired) expired->clear();
     493                 :            : 
     494                 :            :         // Iterate over all CANDIDATE_DELAYED and REQUESTED from old to new, as long as they're in the past,
     495                 :            :         // and convert them to CANDIDATE_READY and COMPLETED respectively.
     496         [ #  # ]:          0 :         while (!m_index.empty()) {
     497                 :          0 :             auto it = m_index.get<ByTime>().begin();
     498 [ #  # ][ #  # ]:          0 :             if (it->GetState() == State::CANDIDATE_DELAYED && it->m_time <= now) {
     499                 :          0 :                 PromoteCandidateReady(m_index.project<ByTxHash>(it));
     500 [ #  # ][ #  # ]:          0 :             } else if (it->GetState() == State::REQUESTED && it->m_time <= now) {
     501         [ #  # ]:          0 :                 if (expired) expired->emplace_back(it->m_peer, ToGenTxid(*it));
     502                 :          0 :                 MakeCompleted(m_index.project<ByTxHash>(it));
     503                 :          0 :             } else {
     504                 :          0 :                 break;
     505                 :            :             }
     506                 :            :         }
     507                 :            : 
     508         [ #  # ]:          0 :         while (!m_index.empty()) {
     509                 :            :             // If time went backwards, we may need to demote CANDIDATE_BEST and CANDIDATE_READY announcements back
     510                 :            :             // to CANDIDATE_DELAYED. This is an unusual edge case, and unlikely to matter in production. However,
     511                 :            :             // it makes it much easier to specify and test TxRequestTracker::Impl's behaviour.
     512                 :          0 :             auto it = std::prev(m_index.get<ByTime>().end());
     513 [ #  # ][ #  # ]:          0 :             if (it->IsSelectable() && it->m_time > now) {
     514                 :          0 :                 ChangeAndReselect(m_index.project<ByTxHash>(it), State::CANDIDATE_DELAYED);
     515                 :          0 :             } else {
     516                 :          0 :                 break;
     517                 :            :             }
     518                 :            :         }
     519                 :          0 :     }
     520                 :            : 
     521                 :            : public:
     522                 :          1 :     explicit Impl(bool deterministic) :
     523                 :          1 :         m_computer(deterministic),
     524                 :            :         // Explicitly initialize m_index as we need to pass a reference to m_computer to ByTxHashViewExtractor.
     525 [ +  - ][ +  - ]:          2 :         m_index(boost::make_tuple(
     526                 :          1 :             boost::make_tuple(ByPeerViewExtractor(), std::less<ByPeerView>()),
     527                 :          1 :             boost::make_tuple(ByTxHashViewExtractor(m_computer), std::less<ByTxHashView>()),
     528                 :          1 :             boost::make_tuple(ByTimeViewExtractor(), std::less<ByTimeView>())
     529                 :          1 :         )) {}
     530                 :            : 
     531                 :            :     // Disable copying and assigning (a default copy won't work due the stateful ByTxHashViewExtractor).
     532                 :            :     Impl(const Impl&) = delete;
     533                 :            :     Impl& operator=(const Impl&) = delete;
     534                 :            : 
     535                 :          0 :     void DisconnectedPeer(NodeId peer)
     536                 :            :     {
     537                 :          0 :         auto& index = m_index.get<ByPeer>();
     538                 :          0 :         auto it = index.lower_bound(ByPeerView{peer, false, uint256::ZERO});
     539 [ #  # ][ #  # ]:          0 :         while (it != index.end() && it->m_peer == peer) {
     540                 :            :             // Check what to continue with after this iteration. 'it' will be deleted in what follows, so we need to
     541                 :            :             // decide what to continue with afterwards. There are a number of cases to consider:
     542                 :            :             // - std::next(it) is end() or belongs to a different peer. In that case, this is the last iteration
     543                 :            :             //   of the loop (denote this by setting it_next to end()).
     544                 :            :             // - 'it' is not the only non-COMPLETED announcement for its txhash. This means it will be deleted, but
     545                 :            :             //   no other Announcement objects will be modified. Continue with std::next(it) if it belongs to the
     546                 :            :             //   same peer, but decide this ahead of time (as 'it' may change position in what follows).
     547                 :            :             // - 'it' is the only non-COMPLETED announcement for its txhash. This means it will be deleted along
     548                 :            :             //   with all other announcements for the same txhash - which may include std::next(it). However, other
     549                 :            :             //   than 'it', no announcements for the same peer can be affected (due to (peer, txhash) uniqueness).
     550                 :            :             //   In other words, the situation where std::next(it) is deleted can only occur if std::next(it)
     551                 :            :             //   belongs to a different peer but the same txhash as 'it'. This is covered by the first bulletpoint
     552                 :            :             //   already, and we'll have set it_next to end().
     553 [ #  # ][ #  # ]:          0 :             auto it_next = (std::next(it) == index.end() || std::next(it)->m_peer != peer) ? index.end() :
     554                 :          0 :                 std::next(it);
     555                 :            :             // If the announcement isn't already COMPLETED, first make it COMPLETED (which will mark other
     556                 :            :             // CANDIDATEs as CANDIDATE_BEST, or delete all of a txhash's announcements if no non-COMPLETED ones are
     557                 :            :             // left).
     558         [ #  # ]:          0 :             if (MakeCompleted(m_index.project<ByTxHash>(it))) {
     559                 :            :                 // Then actually delete the announcement (unless it was already deleted by MakeCompleted).
     560                 :          0 :                 Erase<ByPeer>(it);
     561                 :          0 :             }
     562                 :          0 :             it = it_next;
     563                 :            :         }
     564                 :          0 :     }
     565                 :            : 
     566                 :          0 :     void ForgetTxHash(const uint256& txhash)
     567                 :            :     {
     568                 :          0 :         auto it = m_index.get<ByTxHash>().lower_bound(ByTxHashView{txhash, State::CANDIDATE_DELAYED, 0});
     569 [ #  # ][ #  # ]:          0 :         while (it != m_index.get<ByTxHash>().end() && it->m_txhash == txhash) {
     570                 :          0 :             it = Erase<ByTxHash>(it);
     571                 :            :         }
     572                 :          0 :     }
     573                 :            : 
     574                 :          0 :     void ReceivedInv(NodeId peer, const GenTxid& gtxid, bool preferred,
     575                 :            :         std::chrono::microseconds reqtime)
     576                 :            :     {
     577                 :            :         // Bail out if we already have a CANDIDATE_BEST announcement for this (txhash, peer) combination. The case
     578                 :            :         // where there is a non-CANDIDATE_BEST announcement already will be caught by the uniqueness property of the
     579                 :            :         // ByPeer index when we try to emplace the new object below.
     580         [ #  # ]:          0 :         if (m_index.get<ByPeer>().count(ByPeerView{peer, true, gtxid.GetHash()})) return;
     581                 :            : 
     582                 :            :         // Try creating the announcement with CANDIDATE_DELAYED state (which will fail due to the uniqueness
     583                 :            :         // of the ByPeer index if a non-CANDIDATE_BEST announcement already exists with the same txhash and peer).
     584                 :            :         // Bail out in that case.
     585                 :          0 :         auto ret = m_index.get<ByPeer>().emplace(gtxid, peer, preferred, reqtime, m_current_sequence);
     586         [ #  # ]:          0 :         if (!ret.second) return;
     587                 :            : 
     588                 :            :         // Update accounting metadata.
     589                 :          0 :         ++m_peerinfo[peer].m_total;
     590                 :          0 :         ++m_current_sequence;
     591                 :          0 :     }
     592                 :            : 
     593                 :            :     //! Find the GenTxids to request now from peer.
     594                 :          0 :     std::vector<GenTxid> GetRequestable(NodeId peer, std::chrono::microseconds now,
     595                 :            :         std::vector<std::pair<NodeId, GenTxid>>* expired)
     596                 :            :     {
     597                 :            :         // Move time.
     598                 :          0 :         SetTimePoint(now, expired);
     599                 :            : 
     600                 :            :         // Find all CANDIDATE_BEST announcements for this peer.
     601                 :          0 :         std::vector<const Announcement*> selected;
     602         [ #  # ]:          0 :         auto it_peer = m_index.get<ByPeer>().lower_bound(ByPeerView{peer, true, uint256::ZERO});
     603 [ #  # ][ #  # ]:          0 :         while (it_peer != m_index.get<ByPeer>().end() && it_peer->m_peer == peer &&
         [ #  # ][ #  # ]
                 [ #  # ]
     604         [ #  # ]:          0 :             it_peer->GetState() == State::CANDIDATE_BEST) {
     605         [ #  # ]:          0 :             selected.emplace_back(&*it_peer);
     606         [ #  # ]:          0 :             ++it_peer;
     607                 :            :         }
     608                 :            : 
     609                 :            :         // Sort by sequence number.
     610         [ #  # ]:          0 :         std::sort(selected.begin(), selected.end(), [](const Announcement* a, const Announcement* b) {
     611                 :          0 :             return a->m_sequence < b->m_sequence;
     612                 :            :         });
     613                 :            : 
     614                 :            :         // Convert to GenTxid and return.
     615                 :          0 :         std::vector<GenTxid> ret;
     616         [ #  # ]:          0 :         ret.reserve(selected.size());
     617 [ #  # ][ #  # ]:          0 :         std::transform(selected.begin(), selected.end(), std::back_inserter(ret), [](const Announcement* ann) {
     618                 :          0 :             return ToGenTxid(*ann);
     619                 :            :         });
     620                 :          0 :         return ret;
     621         [ #  # ]:          0 :     }
     622                 :            : 
     623                 :          0 :     void RequestedTx(NodeId peer, const uint256& txhash, std::chrono::microseconds expiry)
     624                 :            :     {
     625                 :          0 :         auto it = m_index.get<ByPeer>().find(ByPeerView{peer, true, txhash});
     626         [ #  # ]:          0 :         if (it == m_index.get<ByPeer>().end()) {
     627                 :            :             // There is no CANDIDATE_BEST announcement, look for a _READY or _DELAYED instead. If the caller only
     628                 :            :             // ever invokes RequestedTx with the values returned by GetRequestable, and no other non-const functions
     629                 :            :             // other than ForgetTxHash and GetRequestable in between, this branch will never execute (as txhashes
     630                 :            :             // returned by GetRequestable always correspond to CANDIDATE_BEST announcements).
     631                 :            : 
     632                 :          0 :             it = m_index.get<ByPeer>().find(ByPeerView{peer, false, txhash});
     633 [ #  # ][ #  # ]:          0 :             if (it == m_index.get<ByPeer>().end() || (it->GetState() != State::CANDIDATE_DELAYED &&
                 [ #  # ]
     634                 :          0 :                                                       it->GetState() != State::CANDIDATE_READY)) {
     635                 :            :                 // There is no CANDIDATE announcement tracked for this peer, so we have nothing to do. Either this
     636                 :            :                 // txhash wasn't tracked at all (and the caller should have called ReceivedInv), or it was already
     637                 :            :                 // requested and/or completed for other reasons and this is just a superfluous RequestedTx call.
     638                 :          0 :                 return;
     639                 :            :             }
     640                 :            : 
     641                 :            :             // Look for an existing CANDIDATE_BEST or REQUESTED with the same txhash. We only need to do this if the
     642                 :            :             // found announcement had a different state than CANDIDATE_BEST. If it did, invariants guarantee that no
     643                 :            :             // other CANDIDATE_BEST or REQUESTED can exist.
     644                 :          0 :             auto it_old = m_index.get<ByTxHash>().lower_bound(ByTxHashView{txhash, State::CANDIDATE_BEST, 0});
     645 [ #  # ][ #  # ]:          0 :             if (it_old != m_index.get<ByTxHash>().end() && it_old->m_txhash == txhash) {
     646         [ #  # ]:          0 :                 if (it_old->GetState() == State::CANDIDATE_BEST) {
     647                 :            :                     // The data structure's invariants require that there can be at most one CANDIDATE_BEST or one
     648                 :            :                     // REQUESTED announcement per txhash (but not both simultaneously), so we have to convert any
     649                 :            :                     // existing CANDIDATE_BEST to another CANDIDATE_* when constructing another REQUESTED.
     650                 :            :                     // It doesn't matter whether we pick CANDIDATE_READY or _DELAYED here, as SetTimePoint()
     651                 :            :                     // will correct it at GetRequestable() time. If time only goes forward, it will always be
     652                 :            :                     // _READY, so pick that to avoid extra work in SetTimePoint().
     653                 :          0 :                     Modify<ByTxHash>(it_old, [](Announcement& ann) { ann.SetState(State::CANDIDATE_READY); });
     654         [ #  # ]:          0 :                 } else if (it_old->GetState() == State::REQUESTED) {
     655                 :            :                     // As we're no longer waiting for a response to the previous REQUESTED announcement, convert it
     656                 :            :                     // to COMPLETED. This also helps guaranteeing progress.
     657                 :          0 :                     Modify<ByTxHash>(it_old, [](Announcement& ann) { ann.SetState(State::COMPLETED); });
     658                 :          0 :                 }
     659                 :          0 :             }
     660                 :          0 :         }
     661                 :            : 
     662                 :          0 :         Modify<ByPeer>(it, [expiry](Announcement& ann) {
     663                 :          0 :             ann.SetState(State::REQUESTED);
     664                 :          0 :             ann.m_time = expiry;
     665                 :          0 :         });
     666                 :          0 :     }
     667                 :            : 
     668                 :          0 :     void ReceivedResponse(NodeId peer, const uint256& txhash)
     669                 :            :     {
     670                 :            :         // We need to search the ByPeer index for both (peer, false, txhash) and (peer, true, txhash).
     671                 :          0 :         auto it = m_index.get<ByPeer>().find(ByPeerView{peer, false, txhash});
     672         [ #  # ]:          0 :         if (it == m_index.get<ByPeer>().end()) {
     673                 :          0 :             it = m_index.get<ByPeer>().find(ByPeerView{peer, true, txhash});
     674                 :          0 :         }
     675         [ #  # ]:          0 :         if (it != m_index.get<ByPeer>().end()) MakeCompleted(m_index.project<ByTxHash>(it));
     676                 :          0 :     }
     677                 :            : 
     678                 :          0 :     size_t CountInFlight(NodeId peer) const
     679                 :            :     {
     680                 :          0 :         auto it = m_peerinfo.find(peer);
     681         [ #  # ]:          0 :         if (it != m_peerinfo.end()) return it->second.m_requested;
     682                 :          0 :         return 0;
     683                 :          0 :     }
     684                 :            : 
     685                 :          0 :     size_t CountCandidates(NodeId peer) const
     686                 :            :     {
     687                 :          0 :         auto it = m_peerinfo.find(peer);
     688         [ #  # ]:          0 :         if (it != m_peerinfo.end()) return it->second.m_total - it->second.m_requested - it->second.m_completed;
     689                 :          0 :         return 0;
     690                 :          0 :     }
     691                 :            : 
     692                 :          0 :     size_t Count(NodeId peer) const
     693                 :            :     {
     694                 :          0 :         auto it = m_peerinfo.find(peer);
     695         [ #  # ]:          0 :         if (it != m_peerinfo.end()) return it->second.m_total;
     696                 :          0 :         return 0;
     697                 :          0 :     }
     698                 :            : 
     699                 :            :     //! Count how many announcements are being tracked in total across all peers and transactions.
     700                 :          0 :     size_t Size() const { return m_index.size(); }
     701                 :            : 
     702                 :          0 :     uint64_t ComputePriority(const uint256& txhash, NodeId peer, bool preferred) const
     703                 :            :     {
     704                 :            :         // Return Priority as a uint64_t as Priority is internal.
     705                 :          0 :         return uint64_t{m_computer(txhash, peer, preferred)};
     706                 :            :     }
     707                 :            : 
     708                 :            : };
     709                 :            : 
     710                 :          1 : TxRequestTracker::TxRequestTracker(bool deterministic) :
     711                 :          1 :     m_impl{std::make_unique<TxRequestTracker::Impl>(deterministic)} {}
     712                 :            : 
     713                 :          1 : TxRequestTracker::~TxRequestTracker() = default;
     714                 :            : 
     715                 :          0 : void TxRequestTracker::ForgetTxHash(const uint256& txhash) { m_impl->ForgetTxHash(txhash); }
     716                 :          0 : void TxRequestTracker::DisconnectedPeer(NodeId peer) { m_impl->DisconnectedPeer(peer); }
     717                 :          0 : size_t TxRequestTracker::CountInFlight(NodeId peer) const { return m_impl->CountInFlight(peer); }
     718                 :          0 : size_t TxRequestTracker::CountCandidates(NodeId peer) const { return m_impl->CountCandidates(peer); }
     719                 :          0 : size_t TxRequestTracker::Count(NodeId peer) const { return m_impl->Count(peer); }
     720                 :          0 : size_t TxRequestTracker::Size() const { return m_impl->Size(); }
     721                 :          0 : void TxRequestTracker::SanityCheck() const { m_impl->SanityCheck(); }
     722                 :            : 
     723                 :          0 : void TxRequestTracker::PostGetRequestableSanityCheck(std::chrono::microseconds now) const
     724                 :            : {
     725                 :          0 :     m_impl->PostGetRequestableSanityCheck(now);
     726                 :          0 : }
     727                 :            : 
     728                 :          0 : void TxRequestTracker::ReceivedInv(NodeId peer, const GenTxid& gtxid, bool preferred,
     729                 :            :     std::chrono::microseconds reqtime)
     730                 :            : {
     731                 :          0 :     m_impl->ReceivedInv(peer, gtxid, preferred, reqtime);
     732                 :          0 : }
     733                 :            : 
     734                 :          0 : void TxRequestTracker::RequestedTx(NodeId peer, const uint256& txhash, std::chrono::microseconds expiry)
     735                 :            : {
     736                 :          0 :     m_impl->RequestedTx(peer, txhash, expiry);
     737                 :          0 : }
     738                 :            : 
     739                 :          0 : void TxRequestTracker::ReceivedResponse(NodeId peer, const uint256& txhash)
     740                 :            : {
     741                 :          0 :     m_impl->ReceivedResponse(peer, txhash);
     742                 :          0 : }
     743                 :            : 
     744                 :          0 : std::vector<GenTxid> TxRequestTracker::GetRequestable(NodeId peer, std::chrono::microseconds now,
     745                 :            :     std::vector<std::pair<NodeId, GenTxid>>* expired)
     746                 :            : {
     747                 :          0 :     return m_impl->GetRequestable(peer, now, expired);
     748                 :            : }
     749                 :            : 
     750                 :          0 : uint64_t TxRequestTracker::ComputePriority(const uint256& txhash, NodeId peer, bool preferred) const
     751                 :            : {
     752                 :          0 :     return m_impl->ComputePriority(txhash, peer, preferred);
     753                 :            : }

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