bool
OverlayManagerImpl::isPeerPreferred(Peer::pointer peer)
{
std::string pstr = peer->toString();
if (mPreferredPeers.find(pstr) != mPreferredPeers.end())
{
CLOG(DEBUG, "Overlay") << "Peer " << pstr << " is preferred";
return true;
}
if (peer->isAuthenticated())
{
std::string kstr = PubKeyUtils::toStrKey(peer->getPeerID());
std::vector<std::string> const& pk =
mApp.getConfig().PREFERRED_PEER_KEYS;
if (std::find(pk.begin(), pk.end(), kstr) != pk.end())
{
CLOG(DEBUG, "Overlay")
<< "Peer key " << mApp.getConfig().toStrKey(peer->getPeerID())
<< " is preferred";
return true;
}
}
CLOG(DEBUG, "Overlay") << "Peer " << pstr << " is not preferred";
return false;
}
bool
OverlayManagerImpl::isPeerAccepted(Peer::pointer peer)
{
if (isPeerPreferred(peer))
{
if (mPeers.size() < mApp.getConfig().MAX_PEER_CONNECTIONS)
{
return true;
}
for (auto victim : mPeers)
{
if (!isPeerPreferred(victim))
{
CLOG(INFO, "Overlay")
<< "Evicting non-preferred peer " << victim->toString()
<< " for preferred peer " << peer->toString();
dropPeer(victim);
return true;
}
}
}
if (!mApp.getConfig().PREFERRED_PEERS_ONLY &&
mPeers.size() < mApp.getConfig().MAX_PEER_CONNECTIONS)
return true;
mConnectionsRejected.Mark();
return false;
}
void
OverlayManagerImpl::dropPeer(Peer::pointer peer)
{
mConnectionsDropped.Mark();
CLOG(DEBUG, "Overlay") << "Dropping peer " << peer->toString();
auto iter = find(mPeers.begin(), mPeers.end(), peer);
if (iter != mPeers.end())
mPeers.erase(iter);
else
CLOG(WARNING, "Overlay") << "Dropping unlisted peer";
mPeersSize.set_count(mPeers.size());
}
void
OverlayManagerImpl::addConnectedPeer(Peer::pointer peer)
{
if (mShuttingDown)
{
peer->drop();
return;
}
CLOG(INFO, "Overlay") << "New connected peer " << peer->toString();
mConnectionsEstablished.Mark();
mPeers.push_back(peer);
mPeersSize.set_count(mPeers.size());
}
void
Tracker::tryNextPeer()
{
// will be called by some timer or when we get a
// response saying they don't have it
Peer::pointer peer;
CLOG(TRACE, "Overlay") << "tryNextPeer " << hexAbbrev(mItemHash)
<< " last: " << (mLastAskedPeer
? mLastAskedPeer->toString()
: "<none>");
// if we don't have a list of peers to ask and we're not
// currently asking peers, build a new list
if (mPeersToAsk.empty() && !mLastAskedPeer)
{
std::set<std::shared_ptr<Peer>> peersWithEnvelope;
for (auto const& e : mWaitingEnvelopes)
{
auto const& s = mApp.getOverlayManager().getPeersKnows(e.first);
peersWithEnvelope.insert(s.begin(), s.end());
}
// move the peers that have the envelope to the back,
// to be processed first
for (auto const& p : mApp.getOverlayManager().getRandomPeers())
{
if (peersWithEnvelope.find(p) != peersWithEnvelope.end())
{
mPeersToAsk.emplace_back(p);
}
else
{
mPeersToAsk.emplace_front(p);
}
}
mNumListRebuild++;
CLOG(TRACE, "Overlay") << "tryNextPeer " << hexAbbrev(mItemHash)
<< " attempt " << mNumListRebuild
<< " reset to #" << mPeersToAsk.size();
mTryNextPeerReset.Mark();
}
while (!peer && !mPeersToAsk.empty())
{
peer = mPeersToAsk.back();
if (!peer->isAuthenticated())
{
peer.reset();
}
mPeersToAsk.pop_back();
}
std::chrono::milliseconds nextTry;
if (!peer)
{ // we have asked all our peers
// clear mLastAskedPeer so that we rebuild a new list
mLastAskedPeer.reset();
if (mNumListRebuild > MAX_REBUILD_FETCH_LIST)
{
nextTry = MS_TO_WAIT_FOR_FETCH_REPLY * MAX_REBUILD_FETCH_LIST;
}
else
{
nextTry = MS_TO_WAIT_FOR_FETCH_REPLY * mNumListRebuild;
}
}
else
{
mLastAskedPeer = peer;
CLOG(TRACE, "Overlay") << "Asking for " << hexAbbrev(mItemHash)
<< " to " << peer->toString();
mTryNextPeer.Mark();
mAskPeer(peer, mItemHash);
nextTry = MS_TO_WAIT_FOR_FETCH_REPLY;
}
mTimer.expires_from_now(nextTry);
mTimer.async_wait([this]() { this->tryNextPeer(); },
VirtualTimer::onFailureNoop);
}