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Ensure that check_for_updates_tref is set #3225

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Aug 20, 2021
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Ensure that check_for_updates_tref is set #3225

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21 changes: 12 additions & 9 deletions src/domain/service_domain_db.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,7 @@ handle_cast(initial_loading, State) ->
?LOG_INFO(#{what => domains_loaded, last_event_id => LastEventId}),
NewState = State#{last_event_id => LastEventId,
check_for_updates_interval => 30000},
{noreply, handle_check_for_updates(NewState)};
{noreply, handle_check_for_updates(NewState, true)};
handle_cast(reset_and_shutdown, State) ->
%% to ensure that domains table is re-read from
%% scratch, we must reset the last event id.
Expand All @@ -123,7 +123,7 @@ handle_cast(Msg, State) ->
{noreply, State}.

handle_info(check_for_updates, State) ->
{noreply, handle_check_for_updates(State)};
{noreply, handle_check_for_updates(State, false)};
handle_info(Info, State) ->
?UNEXPECTED_INFO(Info),
{noreply, State}.
Expand All @@ -148,19 +148,22 @@ initial_load(LastEventId) when is_integer(LastEventId) ->
LastEventId. %% Skip initial init

handle_check_for_updates(State = #{last_event_id := LastEventId,
check_for_updates_interval := Interval}) ->
maybe_cancel_timer(State),
check_for_updates_interval := Interval},
IsInitial) ->
maybe_cancel_timer(IsInitial, State),
receive_all_check_for_updates(),
PageSize = 1000,
LastEventId2 = mongoose_domain_loader:check_for_updates(LastEventId, PageSize),
maybe_set_last_event_id(LastEventId, LastEventId2),
TRef = erlang:send_after(Interval, self(), check_for_updates),
State#{last_event_id => LastEventId2, check_for_updates => TRef}.
State#{last_event_id => LastEventId2, check_for_updates_tref => TRef}.

maybe_cancel_timer(#{check_for_updates_tref := TRef}) ->
erlang:cancel_timer(TRef);
maybe_cancel_timer(_) ->
ok.
maybe_cancel_timer(IsInitial, State) ->
TRef = maps:get(check_for_updates_tref, State, undefined),
case {IsInitial, TRef} of
{true, undefined} -> ok; %% TRef is not set the first time
{false, _} -> erlang:cancel_timer(TRef)
end.

receive_all_check_for_updates() ->
receive check_for_updates -> receive_all_check_for_updates() after 0 -> ok end.
Expand Down