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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 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>
class AddrMan;
class CChainParams;
class CTxMemPool;
class ChainstateManager;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
static const bool DEFAULT_PEERBLOOMFILTERS = false;
static const bool DEFAULT_PEERBLOCKFILTERS = false;
/** Threshold for marking a node to be discouraged, e.g. disconnected and added to the discouragement filter. */
static const int DISCOURAGEMENT_THRESHOLD{100};
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};
};
class PeerManager : public CValidationInterface, public NetEventsInterface
{
public:
static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,
BanMan* banman, ChainstateManager& chainman,
CTxMemPool& pool, bool ignore_incoming_txs);
virtual ~PeerManager() { }
/**
* Attempt to manually fetch block from a given peer. We must already have the header.
*
* @param[in] peer_id The peer id
* @param[in] block_index The blockindex
* @returns std::nullopt if a request was successfully made, otherwise an error message
*/
virtual std::optional<std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) = 0;
/** Begin running background tasks, should only be called once */
virtual void StartScheduledTasks(CScheduler& scheduler) = 0;
/** Get statistics from node state */
virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const = 0;
/** Whether this node ignores txs received over p2p. */
virtual bool IgnoresIncomingTxs() = 0;
/** Relay transaction to all peers. */
virtual void RelayTransaction(const uint256& txid, const uint256& wtxid) = 0;
/** Send ping message to all peers */
virtual void SendPings() = 0;
/** Set the best height */
virtual void SetBestHeight(int height) = 0;
/**
* Increment peer's misbehavior score. If the new value >= DISCOURAGEMENT_THRESHOLD, mark the node
* to be discouraged, meaning the peer might be disconnected and added to the discouragement filter.
* Public for unit testing.
*/
virtual void Misbehaving(const NodeId pnode, const int howmuch, const std::string& message) = 0;
/**
* Evict extra outbound peers. If we think our tip may be stale, connect to an extra outbound.
* Public for unit testing.
*/
virtual void CheckForStaleTipAndEvictPeers() = 0;
/** Process a single message from a peer. Public for fuzz testing */
virtual void ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv,
const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) = 0;
/** This function is used for testing the stale tip eviction logic, see denialofservice_tests.cpp */
virtual void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) = 0;
};
#endif // BITCOIN_NET_PROCESSING_H
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