emqx4.3/include/emqttd_internal.hrl

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%%% @doc
%%% MQTT Internal Header.
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%%% @end
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-define(record_to_proplist(Def, Rec),
        lists:zip(record_info(fields, Def),
                  tl(tuple_to_list(Rec)))).

-define(record_to_proplist(Def, Rec, Fields),
    [{K, V} || {K, V} <- ?record_to_proplist(Def, Rec),
                         lists:member(K, Fields)]).