/root/bitcoin/src/private_broadcast.h

Source
// Copyright (c) 2023-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://opensource.org/license/mit/.

#ifndef BITCOIN_PRIVATE_BROADCAST_H
#define BITCOIN_PRIVATE_BROADCAST_H

#include <net.h>
#include <primitives/transaction.h>
#include <primitives/transaction_identifier.h>
#include <sync.h>
#include <util/time.h>

#include <optional>
#include <tuple>
#include <unordered_map>
#include <vector>

/**
 * Store a list of transactions to be broadcast privately. Supports the following operations:
 * - Add a new transaction
 * - Remove a transaction
 * - Pick a transaction for sending to one recipient
 * - Query which transaction has been picked for sending to a given recipient node
 * - Mark that a given recipient node has confirmed receipt of a transaction
 * - Query whether a given recipient node has confirmed reception
 * - Query whether any transactions that need sending are currently on the list
 */
class PrivateBroadcast
{
public:
    struct PeerSendInfo {
        CService address;
        NodeClock::time_point sent;
        std::optional<NodeClock::time_point> received;
    };

    struct TxBroadcastInfo {
        CTransactionRef tx;
        std::vector<PeerSendInfo> peers;
    };

    /**
     * Add a transaction to the storage.
     * @param[in] tx The transaction to add.
     * @retval true The transaction was added.
     * @retval false The transaction was already present.
     */
    bool Add(const CTransactionRef& tx)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Forget a transaction.
     * @param[in] tx Transaction to forget.
     * @retval !nullopt The number of times the transaction was sent and confirmed
     * by the recipient (if the transaction existed and was removed).
     * @retval nullopt The transaction was not in the storage.
     */
    std::optional<size_t> Remove(const CTransactionRef& tx)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Pick the transaction with the fewest send attempts, and confirmations,
     * and oldest send/confirm times.
     * @param[in] will_send_to_nodeid Will remember that the returned transaction
     * was picked for sending to this node.
     * @param[in] will_send_to_address Address of the peer to which this transaction
     * will be sent.
     * @return Most urgent transaction or nullopt if there are no transactions.
     */
    std::optional<CTransactionRef> PickTxForSend(const NodeId& will_send_to_nodeid, const CService& will_send_to_address)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Get the transaction that was picked for sending to a given node by PickTxForSend().
     * @param[in] nodeid Node to which a transaction is being (or was) sent.
     * @return Transaction or nullopt if the nodeid is unknown.
     */
    std::optional<CTransactionRef> GetTxForNode(const NodeId& nodeid)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Mark that the node has confirmed reception of the transaction we sent it by
     * responding with `PONG` to our `PING` message.
     * @param[in] nodeid Node that we sent a transaction to.
     */
    void NodeConfirmedReception(const NodeId& nodeid)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Check if the node has confirmed reception of the transaction.
     * @retval true Node has confirmed, `NodeConfirmedReception()` has been called.
     * @retval false Node has not confirmed, `NodeConfirmedReception()` has not been called.
     */
    bool DidNodeConfirmReception(const NodeId& nodeid)
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Check if there are transactions that need to be broadcast.
     */
    bool HavePendingTransactions()
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Get the transactions that have not been broadcast recently.
     */
    std::vector<CTransactionRef> GetStale() const
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

    /**
     * Get stats about all transactions currently being privately broadcast.
     */
    std::vector<TxBroadcastInfo> GetBroadcastInfo() const
        EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);

private:
    /// Status of a transaction sent to a given node.
    struct SendStatus {
        const NodeId nodeid; /// Node to which the transaction will be sent (or was sent).
        const CService address; /// Address of the node.
        const NodeClock::time_point picked; ///< When was the transaction picked for sending to the node.
        std::optional<NodeClock::time_point> confirmed; ///< When was the transaction reception confirmed by the node (by PONG).

        SendStatus(const NodeId& nodeid, const CService& address, const NodeClock::time_point& picked) : nodeid{nodeid}, address{address}, picked{picked} {}
    };

    /// Cumulative stats from all the send attempts for a transaction. Used to prioritize transactions.
    struct Priority {
        size_t num_picked{0}; ///< Number of times the transaction was picked for sending.
        NodeClock::time_point last_picked{}; ///< The most recent time when the transaction was picked for sending.
        size_t num_confirmed{0}; ///< Number of nodes that have confirmed reception of a transaction (by PONG).
        NodeClock::time_point last_confirmed{}; ///< The most recent time when the transaction was confirmed.

        auto operator<=>(const Priority& other) const
        {
            // Invert `other` and `this` in the comparison because smaller num_picked, num_confirmed or
            // earlier times mean greater priority. In other words, if this.num_picked < other.num_picked
            // then this > other.
            return std::tie(other.num_picked, other.num_confirmed, other.last_picked, other.last_confirmed) <=>
                   std::tie(num_picked, num_confirmed, last_picked, last_confirmed);
        }
    };

    /// A pair of a transaction and a sent status for a given node. Convenience return type of GetSendStatusByNode().
    struct TxAndSendStatusForNode {
        const CTransactionRef& tx;
        SendStatus& send_status;
    };

    // No need for salted hasher because we are going to store just a bunch of locally originating transactions.

    struct CTransactionRefHash {
        size_t operator()(const CTransactionRef& tx) const
        {
            return static_cast<size_t>(tx->GetWitnessHash().ToUint256().GetUint64(0));
        }
    };

    struct CTransactionRefComp {
        bool operator()(const CTransactionRef& a, const CTransactionRef& b) const
        {
            return a->GetWitnessHash() == b->GetWitnessHash(); // If wtxid equals, then txid also equals.
        }
    };

    /**
     * Derive the sending priority of a transaction.
     * @param[in] sent_to List of nodes that the transaction has been sent to.
     */
    static Priority DerivePriority(const std::vector<SendStatus>& sent_to);

    /**
     * Find which transaction we sent to a given node (marked by PickTxForSend()).
     * @return That transaction together with the send status or nullopt if we did not
     * send any transaction to the given node.
     */
    std::optional<TxAndSendStatusForNode> GetSendStatusByNode(const NodeId& nodeid)
        EXCLUSIVE_LOCKS_REQUIRED(m_mutex);

    mutable Mutex m_mutex;
    std::unordered_map<CTransactionRef, std::vector<SendStatus>, CTransactionRefHash, CTransactionRefComp>
        m_transactions GUARDED_BY(m_mutex);
};

#endif // BITCOIN_PRIVATE_BROADCAST_H

Line	Count	Source
1		// Copyright (c) 2023-present The Bitcoin Core developers
2		// Distributed under the MIT software license, see the accompanying
3		// file COPYING or https://opensource.org/license/mit/.
4
5		#ifndef BITCOIN_PRIVATE_BROADCAST_H
6		#define BITCOIN_PRIVATE_BROADCAST_H
7
8		#include <net.h>
9		#include <primitives/transaction.h>
10		#include <primitives/transaction_identifier.h>
11		#include <sync.h>
12		#include <util/time.h>
13
14		#include <optional>
15		#include <tuple>
16		#include <unordered_map>
17		#include <vector>
18
19		/**
20		* Store a list of transactions to be broadcast privately. Supports the following operations:
21		* - Add a new transaction
22		* - Remove a transaction
23		* - Pick a transaction for sending to one recipient
24		* - Query which transaction has been picked for sending to a given recipient node
25		* - Mark that a given recipient node has confirmed receipt of a transaction
26		* - Query whether a given recipient node has confirmed reception
27		* - Query whether any transactions that need sending are currently on the list
28		*/
29		class PrivateBroadcast
30		{
31		public:
32		struct PeerSendInfo {
33		CService address;
34		NodeClock::time_point sent;
35		std::optional<NodeClock::time_point> received;
36		};
37
38		struct TxBroadcastInfo {
39		CTransactionRef tx;
40		std::vector<PeerSendInfo> peers;
41		};
42
43		/**
44		* Add a transaction to the storage.
45		* @param[in] tx The transaction to add.
46		* @retval true The transaction was added.
47		* @retval false The transaction was already present.
48		*/
49		bool Add(const CTransactionRef& tx)
50		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
51
52		/**
53		* Forget a transaction.
54		* @param[in] tx Transaction to forget.
55		* @retval !nullopt The number of times the transaction was sent and confirmed
56		* by the recipient (if the transaction existed and was removed).
57		* @retval nullopt The transaction was not in the storage.
58		*/
59		std::optional<size_t> Remove(const CTransactionRef& tx)
60		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
61
62		/**
63		* Pick the transaction with the fewest send attempts, and confirmations,
64		* and oldest send/confirm times.
65		* @param[in] will_send_to_nodeid Will remember that the returned transaction
66		* was picked for sending to this node.
67		* @param[in] will_send_to_address Address of the peer to which this transaction
68		* will be sent.
69		* @return Most urgent transaction or nullopt if there are no transactions.
70		*/
71		std::optional<CTransactionRef> PickTxForSend(const NodeId& will_send_to_nodeid, const CService& will_send_to_address)
72		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
73
74		/**
75		* Get the transaction that was picked for sending to a given node by PickTxForSend().
76		* @param[in] nodeid Node to which a transaction is being (or was) sent.
77		* @return Transaction or nullopt if the nodeid is unknown.
78		*/
79		std::optional<CTransactionRef> GetTxForNode(const NodeId& nodeid)
80		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
81
82		/**
83		* Mark that the node has confirmed reception of the transaction we sent it by
84		* responding with `PONG` to our `PING` message.
85		* @param[in] nodeid Node that we sent a transaction to.
86		*/
87		void NodeConfirmedReception(const NodeId& nodeid)
88		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
89
90		/**
91		* Check if the node has confirmed reception of the transaction.
92		* @retval true Node has confirmed, `NodeConfirmedReception()` has been called.
93		* @retval false Node has not confirmed, `NodeConfirmedReception()` has not been called.
94		*/
95		bool DidNodeConfirmReception(const NodeId& nodeid)
96		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
97
98		/**
99		* Check if there are transactions that need to be broadcast.
100		*/
101		bool HavePendingTransactions()
102		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
103
104		/**
105		* Get the transactions that have not been broadcast recently.
106		*/
107		std::vector<CTransactionRef> GetStale() const
108		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
109
110		/**
111		* Get stats about all transactions currently being privately broadcast.
112		*/
113		std::vector<TxBroadcastInfo> GetBroadcastInfo() const
114		EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
115
116		private:
117		/// Status of a transaction sent to a given node.
118		struct SendStatus {
119		const NodeId nodeid; /// Node to which the transaction will be sent (or was sent).
120		const CService address; /// Address of the node.
121		const NodeClock::time_point picked; ///< When was the transaction picked for sending to the node.
122		std::optional<NodeClock::time_point> confirmed; ///< When was the transaction reception confirmed by the node (by PONG).
123
124	0	SendStatus(const NodeId& nodeid, const CService& address, const NodeClock::time_point& picked) : nodeid{nodeid}, address{address}, picked{picked} {}
125		};
126
127		/// Cumulative stats from all the send attempts for a transaction. Used to prioritize transactions.
128		struct Priority {
129		size_t num_picked{0}; ///< Number of times the transaction was picked for sending.
130		NodeClock::time_point last_picked{}; ///< The most recent time when the transaction was picked for sending.
131		size_t num_confirmed{0}; ///< Number of nodes that have confirmed reception of a transaction (by PONG).
132		NodeClock::time_point last_confirmed{}; ///< The most recent time when the transaction was confirmed.
133
134		auto operator<=>(const Priority& other) const
135	0	{
136		// Invert `other` and `this` in the comparison because smaller num_picked, num_confirmed or
137		// earlier times mean greater priority. In other words, if this.num_picked < other.num_picked
138		// then this > other.
139	0	return std::tie(other.num_picked, other.num_confirmed, other.last_picked, other.last_confirmed) <=>
140	0	std::tie(num_picked, num_confirmed, last_picked, last_confirmed);
141	0	}
142		};
143
144		/// A pair of a transaction and a sent status for a given node. Convenience return type of GetSendStatusByNode().
145		struct TxAndSendStatusForNode {
146		const CTransactionRef& tx;
147		SendStatus& send_status;
148		};
149
150		// No need for salted hasher because we are going to store just a bunch of locally originating transactions.
151
152		struct CTransactionRefHash {
153		size_t operator()(const CTransactionRef& tx) const
154	17.6M	{
155	17.6M	return static_cast<size_t>(tx->GetWitnessHash().ToUint256().GetUint64(0));
156	17.6M	}
157		};
158
159		struct CTransactionRefComp {
160		bool operator()(const CTransactionRef& a, const CTransactionRef& b) const
161	0	{
162	0	return a->GetWitnessHash() == b->GetWitnessHash(); // If wtxid equals, then txid also equals.
163	0	}
164		};
165
166		/**
167		* Derive the sending priority of a transaction.
168		* @param[in] sent_to List of nodes that the transaction has been sent to.
169		*/
170		static Priority DerivePriority(const std::vector<SendStatus>& sent_to);
171
172		/**
173		* Find which transaction we sent to a given node (marked by PickTxForSend()).
174		* @return That transaction together with the send status or nullopt if we did not
175		* send any transaction to the given node.
176		*/
177		std::optional<TxAndSendStatusForNode> GetSendStatusByNode(const NodeId& nodeid)
178		EXCLUSIVE_LOCKS_REQUIRED(m_mutex);
179
180		mutable Mutex m_mutex;
181		std::unordered_map<CTransactionRef, std::vector<SendStatus>, CTransactionRefHash, CTransactionRefComp>
182		m_transactions GUARDED_BY(m_mutex);
183		};
184
185		#endif // BITCOIN_PRIVATE_BROADCAST_H

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