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perf: avoid unnecessary transaction

This commit is contained in:
Thales Macedo Garitezi 2023-08-11 10:12:41 -03:00
parent c28c6d1b7e
commit 8eab389ae1
1 changed files with 10 additions and 17 deletions
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27
apps/emqx_durable_storage/src/emqx_ds.erl
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@ -126,23 +126,16 @@ message_stats() ->
%% the broker. %% the broker.
-spec session_open(emqx_types:clientid()) -> {_New :: boolean(), session_id(), [iterator_id()]}. -spec session_open(emqx_types:clientid()) -> {_New :: boolean(), session_id(), [iterator_id()]}.
session_open(ClientID) -> session_open(ClientID) ->
{atomic, Ret} = case mnesia:dirty_read(?SESSION_TAB, ClientID) of
mria:transaction( [#session{iterators = Iterators}] ->
?DS_SHARD, IteratorIDs = maps:values(Iterators),
fun() -> {false, ClientID, IteratorIDs};
case mnesia:read(?SESSION_TAB, ClientID) of [] ->
[#session{iterators = Iterators}] -> Iterators = #{},
IteratorIDs = maps:values(Iterators), Session = #session{id = ClientID, iterators = Iterators},
{false, ClientID, IteratorIDs}; mria:dirty_write(?SESSION_TAB, Session),
[] -> {true, ClientID, _IteratorIDs = []}
Iterators = #{}, end.
Session = #session{id = ClientID, iterators = Iterators},
mnesia:write(?SESSION_TAB, Session, write),
{true, ClientID, _IteratorIDs = []}
end
end
),
Ret.
%% @doc Called when a client reconnects with `clean session=true' or %% @doc Called when a client reconnects with `clean session=true' or
%% during session GC %% during session GC