// applyConfChange applies a ConfChange to the server. It is only
// invoked with a ConfChange that has already passed through Raft
func (s *EtcdServer) applyConfChange(cc raftpb.ConfChange, confState *raftpb.ConfState) (bool, error) {
if err := s.cluster.ValidateConfigurationChange(cc); err != nil {
cc.NodeID = raft.None
s.r.ApplyConfChange(cc)
return false, err
}
*confState = *s.r.ApplyConfChange(cc)
switch cc.Type {
case raftpb.ConfChangeAddNode:
m := new(Member)
if err := json.Unmarshal(cc.Context, m); err != nil {
plog.Panicf("unmarshal member should never fail: %v", err)
}
if cc.NodeID != uint64(m.ID) {
plog.Panicf("nodeID should always be equal to member ID")
}
s.cluster.AddMember(m)
if m.ID == s.id {
plog.Noticef("added local member %s %v to cluster %s", m.ID, m.PeerURLs, s.cluster.ID())
} else {
s.r.transport.AddPeer(m.ID, m.PeerURLs)
plog.Noticef("added member %s %v to cluster %s", m.ID, m.PeerURLs, s.cluster.ID())
}
case raftpb.ConfChangeRemoveNode:
id := types.ID(cc.NodeID)
s.cluster.RemoveMember(id)
if id == s.id {
return true, nil
} else {
s.r.transport.RemovePeer(id)
plog.Noticef("removed member %s from cluster %s", id, s.cluster.ID())
}
case raftpb.ConfChangeUpdateNode:
m := new(Member)
if err := json.Unmarshal(cc.Context, m); err != nil {
plog.Panicf("unmarshal member should never fail: %v", err)
}
if cc.NodeID != uint64(m.ID) {
plog.Panicf("nodeID should always be equal to member ID")
}
s.cluster.UpdateRaftAttributes(m.ID, m.RaftAttributes)
if m.ID == s.id {
plog.Noticef("update local member %s %v in cluster %s", m.ID, m.PeerURLs, s.cluster.ID())
} else {
s.r.transport.UpdatePeer(m.ID, m.PeerURLs)
plog.Noticef("update member %s %v in cluster %s", m.ID, m.PeerURLs, s.cluster.ID())
}
}
return false, nil
}
