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%% A remote manager is a gen_server for coordination of remotes for
%% all tokens.
%% Spawn one remote per configured p11p module per configured virtual
%% token. Provide a lookup service for servers that need a remote to
%% send a request to, by keeping track of which module is current for
%% a given vtoken.
-module(p11p_remote_manager).
-behaviour(gen_server).
%% API.
-export([start_link/0]).
-export([port_for_token/1]). % For servers.
-export([p11init_done/1, timeout/0]). % For remotes.
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-record(token, {
p11init_done = false :: boolean(),
remotes :: [port()] % Active remote in hd().
}).
-record(state, {
tokens :: #{string() => #token{}}
}).
-define(P11KITREMOTE_PATH, "/home/linus/usr/libexec/p11-kit/p11-kit-remote").
%% API implementation.
-spec start_link() -> {ok, pid()} | {error, term()}.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
port_for_token(_Token) ->
todo.
p11init_done(_Done) ->
todo.
timeout() ->
todo.
%% Genserver callbacks.
init([]) ->
{ok, #state{tokens = init_tokens(p11p_config:tokens())}}.
handle_call(Request, _From, State) ->
lager:debug("Unhandled call: ~p~n", [Request]),
{reply, unhandled, State}.
handle_cast(Request, State) ->
lager:debug("Unhandled cast: ~p~n", [Request]),
{noreply, State}.
handle_info({Port, {exit_status, Status}}, State) ->
lager:info("~p: process exited with ~p", [Port, Status]),
{stop, child_exit, State};
handle_info(Info, State) ->
lager:debug("Unhandled info: ~p~n", [Info]),
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
%% Private functions
-spec init_tokens([any()]) -> #{string() => #token{}}.
init_tokens(ConfTokens) ->
init_tokens(ConfTokens, #{}).
init_tokens([], Acc)->
Acc;
init_tokens([H|T], Acc)->
init_tokens(T, Acc#{p11p_config:nameof(H) => new_token(H)}).
new_token(ConfToken) ->
Remotes = start_remotes(p11p_config:modules_for_token(p11p_config:nameof(ConfToken))),
#token{remotes = Remotes}.
start_remotes(ConfModules) ->
start_remotes(ConfModules, []).
start_remotes([], Acc) ->
lists:reverse(Acc);
start_remotes([H|T], Acc) ->
ModPath = p11p_config:module_path(H),
Port = start_remote(ModPath),
start_remotes(T, [Port | Acc]).
start_remote(ModPath) ->
Port = open_port({spawn_executable, ?P11KITREMOTE_PATH},
[stream, exit_status, {args, [ModPath, "-v"]}]),
lager:debug("~s: New port: ~p", [?P11KITREMOTE_PATH, Port]),
Port.
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