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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;
/** Whether transaction reconciliation protocol should be enabled by default. */
static constexpr bool DEFAULT_TXRECONCILIATION_ENABLE{false};
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const uint32_t DEFAULT_MAX_ORPHAN_TRANSACTIONS{100};
/** Default number of non-mempool transactions to keep around for block reconstruction. Includes
orphan, replaced, and rejected transactions. */
static const uint32_t 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};
/** Maximum number of outstanding CMPCTBLOCK requests for the same block. */
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 {
//! Whether this node is running in -blocksonly mode
bool ignore_incoming_txs{DEFAULT_BLOCKSONLY};
//! Whether transaction reconciliation protocol is enabled
bool reconcile_txs{DEFAULT_TXRECONCILIATION_ENABLE};
//! Maximum number of orphan transactions kept in memory
uint32_t max_orphan_txs{DEFAULT_MAX_ORPHAN_TRANSACTIONS};
//! Number of non-mempool transactions to keep around for block reconstruction. Includes
//! orphan, replaced, and rejected transactions.
uint32_t max_extra_txs{DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN};
//! Whether all P2P messages are captured to disk
bool capture_messages{false};
//! Whether or not the internal RNG behaves deterministically (this is
//! a test-only option).
bool deterministic_rng{false};
};
static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,
BanMan* banman, ChainstateManager& chainman,
CTxMemPool& pool, Options opts);
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;
/** Get peer manager info. */
virtual PeerManagerInfo GetInfo() const = 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 height of the best block and its time (seconds since epoch). */
virtual void SetBestBlock(int height, std::chrono::seconds time) = 0;
/* Public for unit testing. */
virtual void UnitTestMisbehaving(NodeId peer_id, int howmuch) = 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, DataStream& vRecv,
const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 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;
/**
* Gets the set of service flags which are "desirable" for a given peer.
*
* These are the flags which are required for a peer to support for them
* to be "interesting" to us, ie for us to wish to use one of our few
* outbound connection slots for or for us to wish to prioritize keeping
* their connection around.
*
* Relevant service flags may be peer- and state-specific in that the
* version of the peer may determine which flags are required (eg in the
* case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers
* unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which
* case NODE_NETWORK_LIMITED suffices).
*
* Thus, generally, avoid calling with 'services' == NODE_NONE, unless
* state-specific flags must absolutely be avoided. When called with
* 'services' == NODE_NONE, the returned desirable service flags are
* guaranteed to not change dependent on state - ie they are suitable for
* use when describing peers which we know to be desirable, but for which
* we do not have a confirmed set of service flags.
*/
virtual ServiceFlags GetDesirableServiceFlags(ServiceFlags services) const = 0;
};
#endif // BITCOIN_NET_PROCESSING_H
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