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launchdarkly_server_sdk

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LaunchDarkly SDK for Erlang

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launchdarkly_server_sdk src ldclient_user_cache.erl
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src/ldclient_user_cache.erl 

%%-------------------------------------------------------------------

%% @doc User LRU cache

%% @private

%% @end

%%-------------------------------------------------------------------



-module(ldclient_user_cache).



%% API

-export([get_local_reg_name/1]).

-export([notice_user/2]).



%%===================================================================

%% API

%%===================================================================



-spec get_local_reg_name(Tag :: atom()) -> atom().

get_local_reg_name(Tag) ->

    list_to_atom("ldclient_user_cache_" ++ atom_to_list(Tag)).



%% @doc Add to the set of the users we've noticed, and return true if the user

%% was already known to us.

%%

%% @end

-spec notice_user(Tag :: atom(), User :: ldclient_user:user()) -> boolean().

notice_user(_Tag, #{key := <<>>}) ->

    % Empty user key always returns true so it's not indexed

    true;

notice_user(_Tag, #{key := null}) ->

    % Null user key always returns true so it's not indexed

    true;

notice_user(Tag, #{key := UserKey}) ->

    CacheServer = get_local_reg_name(Tag),

    {Exists, _} = lru:contains_or_add(whereis(CacheServer), UserKey, UserKey),

    Exists;

notice_user(_Tag, _User) ->

    % No user key always returns true so it's not indexed

    true.