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fix peerstore apocalypse redux

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This commit prevents us from repeatedly extending the lifetimes of all observed
addresses if a peer keeps on reconnecting.

It also fixes two race conditions:

1. We may end up processing a disconnect after a re-connect and may
accidentally give the addresses associated with that peer a
RecentlyConnectedAddrTTL instead of a ConnectedAddrTTL.

2. We may end up processing a connect after the associated disconnect storing
the associated peer addresses indefinitely.
This commit is contained in:
Steven Allen
2018-01-04 19:06:17 -08:00
parent 2cf5659da2
commit 544094183f
1 changed files with 21 additions and 6 deletions
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25
p2p/protocol/identify/id.go
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@@ -50,6 +50,8 @@ type IDService struct {
currid map[inet.Conn]chan struct{}
currmu sync.RWMutex
addrMu sync.Mutex
// our own observed addresses.
// TODO: instead of expiring, remove these when we disconnect
observedAddrs ObservedAddrSet
@@ -220,9 +222,17 @@ func (ids *IDService) consumeMessage(mes *pb.Identify, c inet.Conn) {
lmaddrs = append(lmaddrs, c.RemoteMultiaddr())
}
// update our peerstore with the addresses. here, we SET the addresses, clearing old ones.
// We are receiving from the peer itself. this is current address ground truth.
ids.Host.Peerstore().SetAddrs(p, lmaddrs, pstore.ConnectedAddrTTL)
// Extend the TTLs on the known (probably) good addresses.
// Taking the lock ensures that we don't concurrently process a disconnect.
ids.addrMu.Lock()
switch ids.Host.Network().Connectedness(p) {
case inet.Connected:
ids.Host.Peerstore().AddAddrs(p, lmaddrs, pstore.ConnectedAddrTTL)
default:
ids.Host.Peerstore().AddAddrs(p, lmaddrs, pstore.RecentlyConnectedAddrTTL)
}
ids.addrMu.Unlock()
log.Debugf("%s received listen addrs for %s: %s", c.LocalPeer(), c.RemotePeer(), lmaddrs)
// get protocol versions
@@ -449,9 +459,14 @@ func (nn *netNotifiee) Connected(n inet.Network, v inet.Conn) {
func (nn *netNotifiee) Disconnected(n inet.Network, v inet.Conn) {
// undo the setting of addresses to peer.ConnectedAddrTTL we did
ids := nn.IDService()
ids.addrMu.Lock()
defer ids.addrMu.Unlock()
if ids.Host.Network().Connectedness(v.RemotePeer()) != inet.Connected {
// Last disconnect.
ps := ids.Host.Peerstore()
addrs := ps.Addrs(v.RemotePeer())
ps.SetAddrs(v.RemotePeer(), addrs, pstore.RecentlyConnectedAddrTTL)
ps.UpdateAddrs(v.RemotePeer(), pstore.ConnectedAddrTTL, pstore.RecentlyConnectedAddrTTL)
}
}
func (nn *netNotifiee) OpenedStream(n inet.Network, v inet.Stream) {}