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Merge #8949: Be more agressive in getting connections to peers with relevant services.

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4630479 Make dnsseed's definition of acute need include relevant services. (Gregory Maxwell)
9583477 Be more aggressive in connecting to peers with relevant services. (Gregory Maxwell)
This commit is contained in:
Wladimir J. van der Laan 2016-10-19 10:41:49 +02:00
commit e44753c067
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1 changed files with 10 additions and 3 deletions
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13
src/net.cpp
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@ -1463,12 +1463,19 @@ static std::string GetDNSHost(const CDNSSeedData& data, ServiceFlags* requiredSe
void CConnman::ThreadDNSAddressSeed()
{
// goal: only query DNS seeds if address need is acute
// Avoiding DNS seeds when we don't need them improves user privacy by
// creating fewer identifying DNS requests, reduces trust by giving seeds
// less influence on the network topology, and reduces traffic to the seeds.
if ((addrman.size() > 0) &&
(!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
MilliSleep(11 * 1000);
LOCK(cs_vNodes);
if (vNodes.size() >= 2) {
int nRelevant = 0;
for (auto pnode : vNodes) {
nRelevant += pnode->fSuccessfullyConnected && ((pnode->nServices & nRelevantServices) == nRelevantServices);
}
if (nRelevant >= 2) {
LogPrintf("P2P peers available. Skipped DNS seeding.\n");
return;
}
@ -1675,8 +1682,8 @@ void CConnman::ThreadOpenConnections()
if (nANow - addr.nLastTry < 600 && nTries < 30)
continue;
// only consider nodes missing relevant services after 40 failed attempts
if ((addr.nServices & nRelevantServices) != nRelevantServices && nTries < 40)
// 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)))
continue;
// do not allow non-default ports, unless after 50 invalid addresses selected already