// configure sends a configuration change through consensus and
// then waits for it to be applied to the server. It
// will block until the change is performed or there is an error.
func (s *EtcdServer) configure(ctx context.Context, cc raftpb.ConfChange) error {
cc.ID = s.reqIDGen.Next()
ch := s.w.Register(cc.ID)
if err := s.r.ProposeConfChange(ctx, cc); err != nil {
s.w.Trigger(cc.ID, nil)
return err
}
select {
case x := <-ch:
if err, ok := x.(error); ok {
return err
}
if x != nil {
log.Panicf("return type should always be error")
}
return nil
case <-ctx.Done():
s.w.Trigger(cc.ID, nil) // GC wait
return parseCtxErr(ctx.Err())
case <-s.done:
return ErrStopped
}
}
