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net: only enforce the services required to connect

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also once half of all outgoing nodes have our preferred flags, require only
minimal flags from the rest.
This commit is contained in:
Cory Fields 2017-05-24 17:00:27 -04:00
parent 217b416c72
commit b6fbfc2282
1 changed files with 20 additions and 1 deletions
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21
src/net.cpp
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@ -1721,11 +1721,17 @@ void CConnman::ThreadOpenConnections()
// Only connect out to one peer per network group (/16 for IPv4).
// Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
int nOutbound = 0;
int nOutboundRelevant = 0;
std::set<std::vector<unsigned char> > setConnected;
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes) {
if (!pnode->fInbound && !pnode->fAddnode) {
// Count the peers that have all relevant services
if (pnode->fSuccessfullyConnected && !pnode->fFeeler && ((pnode->nServices & nRelevantServices) == nRelevantServices)) {
nOutboundRelevant++;
}
// Netgroups for inbound and addnode peers are not excluded because our goal here
// is to not use multiple of our limited outbound slots on a single netgroup
// but inbound and addnode peers do not use our outbound slots. Inbound peers
@ -1789,14 +1795,27 @@ void CConnman::ThreadOpenConnections()
continue;
// only consider nodes missing relevant services after 40 failed attempts and only if less than half the outbound are up.
if ((addr.nServices & nRelevantServices) != nRelevantServices && (nTries < 40 || nOutbound >= (nMaxOutbound >> 1)))
ServiceFlags nRequiredServices = nRelevantServices;
if (nTries >= 40 && nOutbound < (nMaxOutbound >> 1)) {
nRequiredServices = REQUIRED_SERVICES;
}
if ((addr.nServices & nRequiredServices) != nRequiredServices) {
continue;
}
// do not allow non-default ports, unless after 50 invalid addresses selected already
if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50)
continue;
addrConnect = addr;
// regardless of the services assumed to be available, only require the minimum if half or more outbound have relevant services
if (nOutboundRelevant >= (nMaxOutbound >> 1)) {
addrConnect.nServices = REQUIRED_SERVICES;
} else {
addrConnect.nServices = nRequiredServices;
}
break;
}