net_processing.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_NET_PROCESSING_H
#define BITCOIN_NET_PROCESSING_H

#include <net.h>
#include <validationinterface.h>

#include <chrono>

class AddrMan;
class CChainParams;
class CTxMemPool;
class ChainstateManager;

namespace node {
class Warnings;
} // namespace node

static constexpr bool DEFAULT_TXRECONCILIATION_ENABLE{false};
static const uint32_t DEFAULT_MAX_ORPHAN_TRANSACTIONS{100};
static const uint32_t DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN{100};
static const bool DEFAULT_PEERBLOOMFILTERS = false;
static const bool DEFAULT_PEERBLOCKFILTERS = false;
static const unsigned int MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK = 3;

struct CNodeStateStats {
    int nSyncHeight = -1;
    int nCommonHeight = -1;
    int m_starting_height = -1;
    std::chrono::microseconds m_ping_wait;
    std::vector<int> vHeightInFlight;
    bool m_relay_txs;
    CAmount m_fee_filter_received;
    uint64_t m_addr_processed = 0;
    uint64_t m_addr_rate_limited = 0;
    bool m_addr_relay_enabled{false};
    ServiceFlags their_services;
    int64_t presync_height{-1};
    std::chrono::seconds time_offset{0};
};

struct PeerManagerInfo {
    std::chrono::seconds median_outbound_time_offset{0s};
    bool ignores_incoming_txs{false};
};

class PeerManager : public CValidationInterface, public NetEventsInterface
{
public:
    struct Options {
        bool ignore_incoming_txs{DEFAULT_BLOCKSONLY};
        bool reconcile_txs{DEFAULT_TXRECONCILIATION_ENABLE};
        uint32_t max_orphan_txs{DEFAULT_MAX_ORPHAN_TRANSACTIONS};
        uint32_t max_extra_txs{DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN};
        bool capture_messages{false};
        bool deterministic_rng{false};
    };

    static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,
                                             BanMan* banman, ChainstateManager& chainman,
                                             CTxMemPool& pool, node::Warnings& warnings, Options opts);
    virtual ~PeerManager() = default;

    virtual std::optional<std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) = 0;

    virtual void StartScheduledTasks(CScheduler& scheduler) = 0;

    virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const = 0;

    virtual PeerManagerInfo GetInfo() const = 0;

    virtual void RelayTransaction(const uint256& txid, const uint256& wtxid) = 0;

    virtual void SendPings() = 0;

    virtual void SetBestBlock(int height, std::chrono::seconds time) = 0;

    /* Public for unit testing. */
    virtual void UnitTestMisbehaving(NodeId peer_id) = 0;

    virtual void CheckForStaleTipAndEvictPeers() = 0;

    virtual void ProcessMessage(CNode& pfrom, const std::string& msg_type, DataStream& vRecv,
                                const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 0;

    virtual void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) = 0;

    virtual ServiceFlags GetDesirableServiceFlags(ServiceFlags services) const = 0;
};

#endif // BITCOIN_NET_PROCESSING_H