server: prevent adding peers if already disconnected
This addresses an issue where the server ends up tracking a peer that has been disconnected due to it processing a peer's `done` message before its `add` message.
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@ -1563,7 +1563,7 @@ func (s *server) handleUpdatePeerHeights(state *peerState, umsg updatePeerHeight
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// handleAddPeerMsg deals with adding new peers. It is invoked from the
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// peerHandler goroutine.
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func (s *server) handleAddPeerMsg(state *peerState, sp *serverPeer) bool {
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if sp == nil {
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if sp == nil || !sp.Connected() {
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return false
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}
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