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1 : : // Copyright (c) 2024 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 : : #ifndef BITCOIN_NODE_TXDOWNLOADMAN_H
6 : : #define BITCOIN_NODE_TXDOWNLOADMAN_H
7 : :
8 : : #include <net.h>
9 : : #include <node/txorphanage.h>
10 : : #include <policy/packages.h>
11 : :
12 : : #include <cstdint>
13 : : #include <memory>
14 : :
15 : : class CBlock;
16 : : class CRollingBloomFilter;
17 : : class CTxMemPool;
18 : : class GenTxid;
19 : : class TxRequestTracker;
20 : : namespace node {
21 : : class TxDownloadManagerImpl;
22 : :
23 : : /** Maximum number of in-flight transaction requests from a peer. It is not a hard limit, but the threshold at which
24 : : * point the OVERLOADED_PEER_TX_DELAY kicks in. */
25 : : static constexpr int32_t MAX_PEER_TX_REQUEST_IN_FLIGHT = 100;
26 : : /** Maximum number of transactions to consider for requesting, per peer. It provides a reasonable DoS limit to
27 : : * per-peer memory usage spent on announcements, while covering peers continuously sending INVs at the maximum
28 : : * rate (by our own policy, see INVENTORY_BROADCAST_PER_SECOND) for several minutes, while not receiving
29 : : * the actual transaction (from any peer) in response to requests for them. */
30 : : static constexpr int32_t MAX_PEER_TX_ANNOUNCEMENTS = 5000;
31 : : /** How long to delay requesting transactions via txids, if we have wtxid-relaying peers */
32 : : static constexpr auto TXID_RELAY_DELAY{2s};
33 : : /** How long to delay requesting transactions from non-preferred peers */
34 : : static constexpr auto NONPREF_PEER_TX_DELAY{2s};
35 : : /** How long to delay requesting transactions from overloaded peers (see MAX_PEER_TX_REQUEST_IN_FLIGHT). */
36 : : static constexpr auto OVERLOADED_PEER_TX_DELAY{2s};
37 : : /** How long to wait before downloading a transaction from an additional peer */
38 : : static constexpr auto GETDATA_TX_INTERVAL{60s};
39 : : struct TxDownloadOptions {
40 : : /** Read-only reference to mempool. */
41 : : const CTxMemPool& m_mempool;
42 : : /** RNG provided by caller. */
43 : : FastRandomContext& m_rng;
44 : : /** Instantiate TxRequestTracker as deterministic (used for tests). */
45 : : bool m_deterministic_txrequest{false};
46 : : };
47 : : struct TxDownloadConnectionInfo {
48 : : /** Whether this peer is preferred for transaction download. */
49 : : const bool m_preferred;
50 : : /** Whether this peer has Relay permissions. */
51 : : const bool m_relay_permissions;
52 : : /** Whether this peer supports wtxid relay. */
53 : : const bool m_wtxid_relay;
54 : : };
55 : 102 : struct PackageToValidate {
56 : : Package m_txns;
57 : : std::vector<NodeId> m_senders;
58 : : /** Construct a 1-parent-1-child package. */
59 : 26 : explicit PackageToValidate(const CTransactionRef& parent,
60 : : const CTransactionRef& child,
61 : : NodeId parent_sender,
62 : 26 : NodeId child_sender) :
63 [ + + + - : 78 : m_txns{parent, child},
- - - - ]
64 [ + - ]: 26 : m_senders{parent_sender, child_sender}
65 [ + - + - : 104 : {}
+ - ]
66 : :
67 : : // Move ctor
68 : 64 : PackageToValidate(PackageToValidate&& other) : m_txns{std::move(other.m_txns)}, m_senders{std::move(other.m_senders)} {}
69 : : // Copy ctor
70 [ + - ]: 12 : PackageToValidate(const PackageToValidate& other) = default;
71 : :
72 : : // Move assignment
73 : 0 : PackageToValidate& operator=(PackageToValidate&& other) {
74 : 0 : this->m_txns = std::move(other.m_txns);
75 : 0 : this->m_senders = std::move(other.m_senders);
76 : 0 : return *this;
77 : : }
78 : :
79 : 26 : std::string ToString() const {
80 [ - + ]: 26 : Assume(m_txns.size() == 2);
81 : 26 : return strprintf("parent %s (wtxid=%s, sender=%d) + child %s (wtxid=%s, sender=%d)",
82 : 26 : m_txns.front()->GetHash().ToString(),
83 [ + - + - ]: 52 : m_txns.front()->GetWitnessHash().ToString(),
84 : 26 : m_senders.front(),
85 [ + - ]: 52 : m_txns.back()->GetHash().ToString(),
86 [ + - ]: 26 : m_txns.back()->GetWitnessHash().ToString(),
87 [ + - ]: 78 : m_senders.back());
88 : : }
89 : : };
90 : : struct RejectedTxTodo
91 : : {
92 : : bool m_should_add_extra_compact_tx;
93 : : std::vector<Txid> m_unique_parents;
94 : : std::optional<PackageToValidate> m_package_to_validate;
95 : : };
96 : :
97 : :
98 : : /**
99 : : * Class responsible for deciding what transactions to request and, once
100 : : * downloaded, whether and how to validate them. It is also responsible for
101 : : * deciding what transaction packages to validate and how to resolve orphan
102 : : * transactions. Its data structures include TxRequestTracker for scheduling
103 : : * requests, rolling bloom filters for remembering transactions that have
104 : : * already been {accepted, rejected, confirmed}, an orphanage, and a registry of
105 : : * each peer's transaction relay-related information.
106 : : *
107 : : * Caller needs to interact with TxDownloadManager:
108 : : * - ValidationInterface callbacks.
109 : : * - When a potential transaction relay peer connects or disconnects.
110 : : * - When a transaction or package is accepted or rejected from mempool
111 : : * - When a inv, notfound, or tx message is received
112 : : * - To get instructions for which getdata messages to send
113 : : *
114 : : * This class is not thread-safe. Access must be synchronized using an
115 : : * external mutex.
116 : : */
117 : : class TxDownloadManager {
118 : : const std::unique_ptr<TxDownloadManagerImpl> m_impl;
119 : :
120 : : public:
121 : : explicit TxDownloadManager(const TxDownloadOptions& options);
122 : : ~TxDownloadManager();
123 : :
124 : : // Responses to chain events. TxDownloadManager is not an actual client of ValidationInterface, these are called through PeerManager.
125 : : void ActiveTipChange();
126 : : void BlockConnected(const std::shared_ptr<const CBlock>& pblock);
127 : : void BlockDisconnected();
128 : :
129 : : /** Creates a new PeerInfo. Saves the connection info to calculate tx announcement delays later. */
130 : : void ConnectedPeer(NodeId nodeid, const TxDownloadConnectionInfo& info);
131 : :
132 : : /** Deletes all txrequest announcements and orphans for a given peer. */
133 : : void DisconnectedPeer(NodeId nodeid);
134 : :
135 : : /** Consider adding this tx hash to txrequest. Should be called whenever a new inv has been received.
136 : : * Also called internally when a transaction is missing parents so that we can request them.
137 : : * Returns true if this was a dropped inv (p2p_inv=true and we already have the tx), false otherwise. */
138 : : bool AddTxAnnouncement(NodeId peer, const GenTxid& gtxid, std::chrono::microseconds now);
139 : :
140 : : /** Get getdata requests to send. */
141 : : std::vector<GenTxid> GetRequestsToSend(NodeId nodeid, std::chrono::microseconds current_time);
142 : :
143 : : /** Should be called when a notfound for a tx has been received. */
144 : : void ReceivedNotFound(NodeId nodeid, const std::vector<GenTxid>& gtxids);
145 : :
146 : : /** Respond to successful transaction submission to mempool */
147 : : void MempoolAcceptedTx(const CTransactionRef& tx);
148 : :
149 : : /** Respond to transaction rejected from mempool */
150 : : RejectedTxTodo MempoolRejectedTx(const CTransactionRef& ptx, const TxValidationState& state, NodeId nodeid, bool first_time_failure);
151 : :
152 : : /** Respond to package rejected from mempool */
153 : : void MempoolRejectedPackage(const Package& package);
154 : :
155 : : /** Marks a tx as ReceivedResponse in txrequest and checks whether AlreadyHaveTx.
156 : : * Return a bool indicating whether this tx should be validated. If false, optionally, a
157 : : * PackageToValidate. */
158 : : std::pair<bool, std::optional<PackageToValidate>> ReceivedTx(NodeId nodeid, const CTransactionRef& ptx);
159 : :
160 : : /** Whether there are any orphans to reconsider for this peer. */
161 : : bool HaveMoreWork(NodeId nodeid) const;
162 : :
163 : : /** Returns next orphan tx to consider, or nullptr if none exist. */
164 : : CTransactionRef GetTxToReconsider(NodeId nodeid);
165 : :
166 : : /** Check that all data structures are empty. */
167 : : void CheckIsEmpty() const;
168 : :
169 : : /** Check that all data structures that track per-peer information have nothing for this peer. */
170 : : void CheckIsEmpty(NodeId nodeid) const;
171 : :
172 : : /** Wrapper for TxOrphanage::GetOrphanTransactions */
173 : : std::vector<TxOrphanage::OrphanInfo> GetOrphanTransactions() const;
174 : : };
175 : : } // namespace node
176 : : #endif // BITCOIN_NODE_TXDOWNLOADMAN_H
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