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fix(dot/network): re-add nil mutex check for disconnected peer #2408

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merged 2 commits into from
Mar 21, 2022
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fix(dot/network): re-add nil mutex check for disconnected peer #2408

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2fd8c61
fix(dot/network): ugly fix nil mutex for peer
qdm12 Mar 21, 2022
7d64b92
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qdm12 Mar 21, 2022
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8 changes: 8 additions & 0 deletions dot/network/notifications.go
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,8 @@ func (s *Service) sendData(peer peer.ID, hs Handshake, info *notificationsProtoc
}, peer)
}

var errPeerDisconnected = errors.New("peer disconnected")

func (s *Service) sendHandshake(peer peer.ID, hs Handshake, info *notificationsProtocol) (libp2pnetwork.Stream, error) {
// multiple processes could each call this upcoming section, opening multiple streams and
// sending multiple handshakes. thus, we need to have a per-peer and per-protocol lock
Expand All @@ -293,6 +295,12 @@ func (s *Service) sendHandshake(peer peer.ID, hs Handshake, info *notificationsP
// so we cannot have a method on peersData to lock and unlock the mutex
// from the map
peerMutex := info.peersData.getMutex(peer)
if peerMutex == nil {
// Note: the only place the mutex is deleted is when the peer disconnects.
// If it doesn't exist, the peer never connected either.
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return nil, fmt.Errorf("%w: peer id %s", errPeerDisconnected, peer)
}

peerMutex.Lock()
defer peerMutex.Unlock()

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