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fix(route-sync): ensure batch sync preserve idemopotency

This commit is contained in:
Andrew Mayorov 2024-01-11 19:02:17 +01:00
parent e21a3497c7
commit 2f98f1faaf
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1 changed files with 12 additions and 14 deletions
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24
apps/emqx/src/emqx_router_syncer.erl
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@ -312,23 +312,21 @@ stash_add(Prio, ?OP(Action, Topic, Dest, Ctx), Stash) ->
undefined -> undefined ->
Stash#{Route => {Action, Prio, Ctx}}; Stash#{Route => {Action, Prio, Ctx}};
RouteOp -> RouteOp ->
case merge_route_op(RouteOp, ?ROUTEOP(Action, Prio, Ctx)) of RouteOpMerged = merge_route_op(RouteOp, ?ROUTEOP(Action, Prio, Ctx)),
undefined ->
maps:remove(Route, Stash);
RouteOpMerged ->
Stash#{Route := RouteOpMerged} Stash#{Route := RouteOpMerged}
end
end. end.
merge_route_op(?ROUTEOP(Action, _Prio1, Ctx1), DestOp = ?ROUTEOP(Action)) -> merge_route_op(?ROUTEOP(Action, _Prio1, Ctx1), DestOp = ?ROUTEOP(Action)) ->
%% NOTE: This should not happen anyway. %% NOTE: This should not happen anyway.
_ = replyctx_send(ignored, Ctx1), _ = replyctx_send(ignored, Ctx1),
DestOp; DestOp;
merge_route_op(?ROUTEOP(_Action1, _Prio1, Ctx1), ?ROUTEOP(_Action2, _Prio2, Ctx2)) -> merge_route_op(?ROUTEOP(_Action1, _Prio1, Ctx1), DestOp = ?ROUTEOP(_Action2, _Prio2, _Ctx2)) ->
%% NOTE: Operations cancel each other. %% NOTE: Latter cancel the former.
%% Strictly speaking, in ideal conditions we could just cancel both, because they
%% essentially do not change the global state. However, we decided to stay on the
%% safe side and cancel only the former, making batch syncs idempotent.
_ = replyctx_send(ok, Ctx1), _ = replyctx_send(ok, Ctx1),
_ = replyctx_send(ok, Ctx2), DestOp.
undefined.
%% %%
@ -398,13 +396,13 @@ batch_test() ->
[ [
{2, ignored}, {2, ignored},
{1, ok}, {1, ok},
{4, ok},
{5, ok}, {5, ok},
{7, ok}, {7, ignored},
{4, ok},
{9, ok}, {9, ok},
{11, ok},
{8, ok}, {8, ok},
{13, ok} {13, ignored},
{11, ok}
], ],
emqx_utils_stream:consume(emqx_utils_stream:mqueue(0)) emqx_utils_stream:consume(emqx_utils_stream:mqueue(0))
). ).