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[refactor] Simplify connection type logic in ThreadOpenConnections

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Consolidate the logic to determine connection type into one conditional to
clarify how they are chosen.
This commit is contained in:
Amiti Uttarwar 2020-08-13 21:54:38 -07:00
parent 1e563aed78
commit 4829b6fcc6
1 changed files with 24 additions and 37 deletions
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61
src/net.cpp
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@ -1856,28 +1856,32 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
}
}
// Feeler Connections
//
// Design goals:
// * Increase the number of connectable addresses in the tried table.
//
// Method:
// * Choose a random address from new and attempt to connect to it if we can connect
// successfully it is added to tried.
// * Start attempting feeler connections only after node finishes making outbound
// connections.
// * Only make a feeler connection once every few minutes.
//
ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
int64_t nTime = GetTimeMicros();
bool fFeeler = false;
if (nOutboundFullRelay >= m_max_outbound_full_relay && nOutboundBlockRelay >= m_max_outbound_block_relay && !GetTryNewOutboundPeer()) {
int64_t nTime = GetTimeMicros(); // The current time right now (in microseconds).
if (nTime > nNextFeeler) {
nNextFeeler = PoissonNextSend(nTime, FEELER_INTERVAL);
fFeeler = true;
} else {
continue;
}
// Determine what type of connection to open. Opening
// OUTBOUND_FULL_RELAY connections gets the highest priority until we
// meet our full-relay capacity. Then we open BLOCK_RELAY connection
// until we hit our block-relay-only peer limit.
// GetTryNewOutboundPeer() gets set when a stale tip is detected, so we
// try opening an additional OUTBOUND_FULL_RELAY connection. If none of
// these conditions are met, check the nNextFeeler timer to decide if
// we should open a FEELER.
if (nOutboundFullRelay < m_max_outbound_full_relay) {
// OUTBOUND_FULL_RELAY
} else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
conn_type = ConnectionType::BLOCK_RELAY;
} else if (GetTryNewOutboundPeer()) {
// OUTBOUND_FULL_RELAY
} else if (nTime > nNextFeeler) {
nNextFeeler = PoissonNextSend(nTime, FEELER_INTERVAL);
conn_type = ConnectionType::FEELER;
fFeeler = true;
} else {
// skip to next iteration of while loop
continue;
}
addrman.ResolveCollisions();
@ -1944,23 +1948,6 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
LogPrint(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToString());
}
ConnectionType conn_type;
// Determine what type of connection to open. If fFeeler is not
// set, open OUTBOUND connections until we meet our full-relay
// capacity. Then open BLOCK_RELAY connections until we hit our
// block-relay peer limit. Otherwise, default to opening an
// OUTBOUND connection.
if (fFeeler) {
conn_type = ConnectionType::FEELER;
} else if (nOutboundFullRelay < m_max_outbound_full_relay) {
conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
} else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
conn_type = ConnectionType::BLOCK_RELAY;
} else {
// GetTryNewOutboundPeer() is true
conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
}
OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, nullptr, conn_type);
}
}