Github user iilyak commented on a diff in the pull request:
https://github.com/apache/couchdb-couch-epi/pull/12#discussion_r40691917
--- Diff: src/couch_epi_data.erl ---
@@ -12,131 +12,103 @@
-module(couch_epi_data).
--behaviour(gen_server).
+-include("couch_epi.hrl").
%% ------------------------------------------------------------------
%% API Function Exports
%% ------------------------------------------------------------------
--export([childspec/4]).
--export([start_link/4, reload/1]).
--export([wait/1, stop/1]).
-
-%% ------------------------------------------------------------------
-%% gen_server Function Exports
-%% ------------------------------------------------------------------
-
--export([init/1, handle_call/3, handle_cast/2, handle_info/2,
- terminate/2, code_change/3]).
-
--record(state, {
- subscriber, module, key, hash, handle,
- initialized = false, pending = []}).
+-export([interval/1, data/1]).
%% ------------------------------------------------------------------
%% API Function Definitions
%% ------------------------------------------------------------------
-childspec(Id, App, EpiKey, Module) ->
- {
- Id,
- {?MODULE, start_link, [
- App,
- EpiKey,
- Module,
- []
- ]},
- permanent,
- 5000,
- worker,
- [Module]
- }.
-
-start_link(SubscriberApp, {epi_key, Key}, Module, Options) ->
- maybe_start_keeper(Key),
- gen_server:start_link(?MODULE, [SubscriberApp, Module, Key, Options],
[]).
-
-reload(Server) ->
- gen_server:call(Server, reload).
-
-wait(Server) ->
- gen_server:call(Server, wait).
-
-stop(Server) ->
- catch gen_server:call(Server, stop).
+interval(Specs) ->
+ extract_minimal_interval(Specs).
-%% ------------------------------------------------------------------
-%% gen_server Function Definitions
-%% ------------------------------------------------------------------
-
-init([Subscriber, Module, Key, _Options]) ->
- gen_server:cast(self(), init),
- {ok, #state{
- subscriber = Subscriber,
- module = Module,
- key = Key,
- handle = couch_epi_data_gen:get_handle(Key)}}.
-
-handle_call(wait, _From, #state{initialized = true} = State) ->
- {reply, ok, State};
-handle_call(wait, From, #state{pending = Pending} = State) ->
- {noreply, State#state{pending = [From | Pending]}};
-handle_call(reload, _From, State) ->
- {Res, NewState} = reload_if_updated(State),
- {reply, Res, NewState};
-handle_call(stop, _From, State) ->
- {stop, normal, State};
-handle_call(_Request, _From, State) ->
- {reply, ok, State}.
-
-handle_cast(init, #state{pending = Pending} = State) ->
- {_, NewState} = reload_if_updated(State),
- [gen_server:reply(Client, ok) || Client <- Pending],
- {noreply, NewState#state{initialized = true, pending = []}};
-handle_cast(_Msg, State) ->
- {noreply, State}.
-
-handle_info(_Info, State) ->
- {noreply, State}.
-
-terminate(_Reason, _State) ->
- ok.
-
-code_change(_OldVsn, State, _Extra) ->
- {_, NewState} = reload_if_updated(State),
- {ok, NewState}.
+data(Specs) ->
+ Locators = locate_sources(Specs),
+ case lists:foldl(fun collect_data/2, {ok, [], []}, Locators) of
+ {ok, Hashes, Data} ->
+ {ok, couch_epi_util:hash(Hashes), Data};
+ Error ->
+ Error
+ end.
%% ------------------------------------------------------------------
%% Internal Function Definitions
%% ------------------------------------------------------------------
-reload_if_updated(#state{hash = OldHash, module = Module} = State) ->
- case couch_epi_functions_gen:hash([Module]) of
- OldHash ->
- {ok, State};
- Hash ->
- safe_set(Hash, State)
+collect_data({App, Locator}, {ok, HashAcc, DataAcc}) ->
+ case definitions(Locator) of
+ {ok, Hash, Data} ->
+ {ok, [Hash | HashAcc], [{App, Data} | DataAcc]};
+ Error ->
+ Error
+ end;
+collect_data({_App, _Locator}, Error) ->
+ Error.
+
+extract_minimal_interval(Specs) ->
+ lists:foldl(fun minimal_interval/2, undefined, Specs).
+
+minimal_interval({_App, #couch_epi_spec{options = Options}}, Min) ->
+ case lists:keyfind(interval, 1, Options) of
+ {interval, Interval} -> min(Interval, Min);
+ false -> Min
end.
-safe_set(Hash, #state{} = State) ->
- #state{
- handle = Handle,
- subscriber = Subscriber,
- module = Module,
- key = Key} = State,
- try
- Data = get_from_module(Module),
- OldData = couch_epi_data_gen:current_data(Handle, Subscriber),
- ok = couch_epi_data_gen:set(Handle, Subscriber, Data),
- couch_epi_server:notify(Subscriber, Key, {data, OldData}, {data,
Data}),
- {ok, State#state{hash = Hash}}
- catch Class:Reason ->
- {{Class, Reason}, State}
+locate_sources(Specs) ->
+ lists:map(fun({ProviderApp, #couch_epi_spec{value = Src}}) ->
+ {ok, Locator} = locate(ProviderApp, Src),
+ {ProviderApp, Locator}
+ end, Specs).
+
+locate(App, {priv_file, FileName}) ->
+ case priv_path(App, FileName) of
+ {ok, FilePath} ->
+ ok = ensure_exists(FilePath),
+ {ok, {file, FilePath}};
+ Else ->
+ Else
+ end;
+locate(_App, {file, FilePath}) ->
+ ok = ensure_exists(FilePath),
+ {ok, {file, FilePath}};
+locate(_App, Locator) ->
+ {ok, Locator}.
+
+priv_path(AppName, FileName) ->
+ case code:priv_dir(AppName) of
+ {error, _Error} = Error ->
+ Error;
+ Dir ->
+ {ok, filename:join(Dir, FileName)}
end.
-get_from_module(Module) ->
- Module:data().
+ensure_exists(FilePath) ->
+ case filelib:is_regular(FilePath) of
+ true ->
+ ok;
+ false ->
+ {error, {notfound, FilePath}}
--- End diff --
I'll rename the function into `check_exists`.
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