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Merge bitcoin/bitcoin#28464: net: improve max-connection limits code

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df69b22f2e doc: improve documentation around connection limit maximums (Amiti Uttarwar)
adc171edf4 scripted-diff: Rename connection limit variables (Amiti Uttarwar)
e9fd9c0225 net: add m_max_inbound to connman (Amiti Uttarwar)
c25e0e0555 net, refactor: move calculations for connection type limits into connman (Amiti Uttarwar)

Pull request description:

  This is joint work with amitiuttarwar.

  This has the first few commits of #28463. It is not strictly a prerequisite for that, but has changes that in our opinion make sense on their own.
  It improves the handling of maximum numbers for different connection types (that are set during init and don’t change after) by:
  * moving all calculations into one place, `CConnMan::Init()`. Before, they were dispersed between `Init`, `CConnman::Init` and other parts of `CConnman`, resulting in some duplicated test code.
  * removing the possibility of having a negative maximum of inbound connections, which is hard to argue about
  * renaming of variables and doc improvements

ACKs for top commit:
  amitiuttarwar:
    co-author review ACK df69b22f2e
  naumenkogs:
    ACK df69b22f2e
  achow101:
    ACK df69b22f2e

Tree-SHA512: 913d56136bc1df739978de50db67302f88bac2a9d34748ae96763288d97093e998fc0f94f9b6eff12867712d7e86225af6128f4170bf2b5b8ab76f024870a22c
This commit is contained in:
Andrew Chow
2023-11-07 16:53:37 -05:00
parent 962ea5c525 df69b22f2e
commit 82ea4e787c
4 changed files with 34 additions and 35 deletions
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38
src/net.h
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@@ -1045,11 +1045,7 @@ public:
struct Options
{
ServiceFlags nLocalServices = NODE_NONE;
int nMaxConnections = 0;
int m_max_outbound_full_relay = 0;
int m_max_outbound_block_relay = 0;
int nMaxAddnode = 0;
int nMaxFeeler = 0;
int m_max_automatic_connections = 0;
CClientUIInterface* uiInterface = nullptr;
NetEventsInterface* m_msgproc = nullptr;
BanMan* m_banman = nullptr;
@@ -1076,13 +1072,12 @@ public:
AssertLockNotHeld(m_total_bytes_sent_mutex);
nLocalServices = connOptions.nLocalServices;
nMaxConnections = connOptions.nMaxConnections;
m_max_outbound_full_relay = std::min(connOptions.m_max_outbound_full_relay, connOptions.nMaxConnections);
m_max_outbound_block_relay = connOptions.m_max_outbound_block_relay;
m_max_automatic_connections = connOptions.m_max_automatic_connections;
m_max_outbound_full_relay = std::min(MAX_OUTBOUND_FULL_RELAY_CONNECTIONS, m_max_automatic_connections);
m_max_outbound_block_relay = std::min(MAX_BLOCK_RELAY_ONLY_CONNECTIONS, m_max_automatic_connections - m_max_outbound_full_relay);
m_max_automatic_outbound = m_max_outbound_full_relay + m_max_outbound_block_relay + m_max_feeler;
m_max_inbound = std::max(0, m_max_automatic_connections - m_max_automatic_outbound);
m_use_addrman_outgoing = connOptions.m_use_addrman_outgoing;
nMaxAddnode = connOptions.nMaxAddnode;
nMaxFeeler = connOptions.nMaxFeeler;
m_max_outbound = m_max_outbound_full_relay + m_max_outbound_block_relay + nMaxFeeler;
m_client_interface = connOptions.uiInterface;
m_banman = connOptions.m_banman;
m_msgproc = connOptions.m_msgproc;
@@ -1466,7 +1461,18 @@ private:
std::unique_ptr<CSemaphore> semOutbound;
std::unique_ptr<CSemaphore> semAddnode;
int nMaxConnections;
/**
* Maximum number of automatic connections permitted, excluding manual
* connections but including inbounds. May be changed by the user and is
* potentially limited by the operating system (number of file descriptors).
*/
int m_max_automatic_connections;
/*
* Maximum number of peers by connection type. Might vary from defaults
* based on -maxconnections init value.
*/
// How many full-relay (tx, block, addr) outbound peers we want
int m_max_outbound_full_relay;
@@ -1475,9 +1481,11 @@ private:
// We do not relay tx or addr messages with these peers
int m_max_outbound_block_relay;
int nMaxAddnode;
int nMaxFeeler;
int m_max_outbound;
int m_max_addnode{MAX_ADDNODE_CONNECTIONS};
int m_max_feeler{MAX_FEELER_CONNECTIONS};
int m_max_automatic_outbound;
int m_max_inbound;
bool m_use_addrman_outgoing;
CClientUIInterface* m_client_interface;
NetEventsInterface* m_msgproc;