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Merge #7438: Do not absolutely protect local peers; decide group ties based on time.

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8e09f91 Decide eviction group ties based on time. (Gregory Maxwell)
46dbcd4 Do not absolutely protect local peers from eviction. (Gregory Maxwell)
This commit is contained in:
Wladimir J. van der Laan 2016-02-01 10:36:45 +01:00
commit e2d9a58588
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1 changed files with 10 additions and 8 deletions
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18
src/net.cpp
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@ -884,8 +884,6 @@ static bool AttemptToEvictConnection(bool fPreferNewConnection) {
continue;
if (node->fDisconnect)
continue;
if (node->addr.IsLocal())
continue;
vEvictionCandidates.push_back(CNodeRef(node));
}
}
@ -916,15 +914,20 @@ static bool AttemptToEvictConnection(bool fPreferNewConnection) {
if (vEvictionCandidates.empty()) return false;
// Identify the network group with the most connections
// Identify the network group with the most connections and youngest member.
// (vEvictionCandidates is already sorted by reverse connect time)
std::vector<unsigned char> naMostConnections;
unsigned int nMostConnections = 0;
int64_t nMostConnectionsTime = 0;
std::map<std::vector<unsigned char>, std::vector<CNodeRef> > mapAddrCounts;
BOOST_FOREACH(const CNodeRef &node, vEvictionCandidates) {
mapAddrCounts[node->addr.GetGroup()].push_back(node);
int64_t grouptime = mapAddrCounts[node->addr.GetGroup()][0]->nTimeConnected;
size_t groupsize = mapAddrCounts[node->addr.GetGroup()].size();
if (mapAddrCounts[node->addr.GetGroup()].size() > nMostConnections) {
nMostConnections = mapAddrCounts[node->addr.GetGroup()].size();
if (groupsize > nMostConnections || (groupsize == nMostConnections && grouptime > nMostConnectionsTime)) {
nMostConnections = groupsize;
nMostConnectionsTime = grouptime;
naMostConnections = node->addr.GetGroup();
}
}
@ -932,14 +935,13 @@ static bool AttemptToEvictConnection(bool fPreferNewConnection) {
// Reduce to the network group with the most connections
vEvictionCandidates = mapAddrCounts[naMostConnections];
// Do not disconnect peers if there is only 1 connection from their network group
// Do not disconnect peers if there is only one unprotected connection from their network group.
if (vEvictionCandidates.size() <= 1)
// unless we prefer the new connection (for whitelisted peers)
if (!fPreferNewConnection)
return false;
// Disconnect the most recent connection from the network group with the most connections
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), ReverseCompareNodeTimeConnected);
// Disconnect from the network group with the most connections
vEvictionCandidates[0]->fDisconnect = true;
return true;