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Merge bitcoin/bitcoin#29605: net: Favor peers from addrman over fetching seednodes

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6eeb188d40 test: adds seednode functional tests (Sergi Delgado Segura)
3270f0adad net: Favor peers from addrman over fetching seednodes (Sergi Delgado Segura)

Pull request description:

  This is a follow-up of #28016 motivated by https://github.com/bitcoin/bitcoin/pull/28016#pullrequestreview-1913140932 and https://github.com/bitcoin/bitcoin/pull/28016#issuecomment-1984448937.

  The current behavior of seednode fetching is pretty eager: we do it as the first step under `ThreadOpenNetworkConnections` even if some peers may be queryable from our addrman. This poses two potential issues:

  - First, if permanently set (e.g. running with seednode in a config file) we'd be signaling such seed every time we restart our node
  - Second, we will be giving the seed node way too much influence over our addrman, populating the latter with data from the former even when unnecessary

  This changes the behavior to only add seednodes to `m_addr_fetch` if our addrman is empty, or little by little after we've spent some time trying addresses from our addrman. Also, seednodes are added to `m_addr_fetch` in random order, to avoid signaling the same node in case more than one seed is added and we happen to try them over multiple restarts

ACKs for top commit:
  achow101:
    ACK 6eeb188d40
  cbergqvist:
    ACK 6eeb188d40
  itornaza:
    Tested ACK 6eeb188d40
  tdb3:
    ACK 6eeb188d40

Tree-SHA512: b04445412f22018852d6bef4d3f1e88425ee6ddb434f61dcffa9e0c41b8e31f8c56f83858d5c7686289c86dc4c9476c437df15ea61a47082e2bb2e073cc62f15
This commit is contained in:
Ava Chow
2024-09-04 13:15:08 -04:00
parent b8d2f58e06 6eeb188d40
commit cb65ac469a
4 changed files with 92 additions and 9 deletions
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2
src/net.h
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@@ -1273,7 +1273,7 @@ private:
void ThreadOpenAddedConnections() EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
void AddAddrFetch(const std::string& strDest) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex);
void ProcessAddrFetch() EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_unused_i2p_sessions_mutex);
void ThreadOpenConnections(std::vector<std::string> connect) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_added_nodes_mutex, !m_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
void ThreadOpenConnections(std::vector<std::string> connect, Span<const std::string> seed_nodes) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_added_nodes_mutex, !m_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
void ThreadMessageHandler() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
void ThreadI2PAcceptIncoming();
void AcceptConnection(const ListenSocket& hListenSocket);