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%%% Copyright (c) 2019, Sunet.
%%% See LICENSE for licensing information.
%% A client spawns an Erlang port running a proxy app, i.e. the
%% 'remote' program from p11-kit.
%% Receive p11 requests from p11p_server, forward them to the proxy app,
%% wait for a reply. If a reply is received within a timeout period,
%% forward the reply to the requesting p11p_server. If the request
%% times out, inform the manager (our parent).
-module(p11p_client).
-behaviour(gen_server).
%% API.
-export([start_link/4]).
-export([request/2, stop/2]).
-include("p11p_rpc.hrl").
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-record(state, {
port :: port(),
replyto :: pid() | undefined,
timer :: reference() | undefined,
token :: string(), % Token name.
msg :: p11rpc:msg() | undefined,
recv_count = 0 :: non_neg_integer(),
send_count = 0 :: non_neg_integer()
}).
%% API.
-spec start_link(atom(), string(), string(), list()) ->
{ok, pid()} | {error, term()}.
start_link(ServName, TokName, ModPath, ModEnv) ->
lager:info("~p: p11p_client starting for ~s", [ServName, ModPath]),
gen_server:start_link({local, ServName}, ?MODULE,
[TokName, ModPath, ModEnv], []).
-spec request(pid(), p11rpc_msg()) -> {ok, non_neg_integer()}.
request(Client, Request) ->
gen_server:call(Client, {request, Request}).
%% Use stop/1 instead of gen_server:stop/1 if you're uncertain whether
%% we (Pid) are alive or not. An example of when that can happen is when the
%% manager receives a server_event about a lost p11 app. If the server
%% process terminated on request from us because we timed out on
%% an rpc call, chances are that we have already terminated by
%% the time the manager is to act on the lost app.
stop(Pid, Reason) ->
gen_server:cast(Pid, {stop, Reason}).
%% Genserver callbacks.
init([TokName, ModPath, ModEnv]) ->
ProxyAppBinPath = p11p_config:proxyapp_bin_path(),
Port = open_port({spawn_executable, ProxyAppBinPath},
[stream,
exit_status,
{env, ModEnv},
{args, [ModPath, "-v"]} % FIXME: Remove -v
]),
lager:debug("~p: ~s: new proxy app port: ~p", [self(), ProxyAppBinPath, Port]),
lager:debug("~p: ~s: module: ~s, env: ~p", [self(), ProxyAppBinPath, ModPath, ModEnv]),
{ok, #state{port = Port, token = TokName}}.
handle_call({request, Request}, {FromPid, _Tag},
#state{port = Port, send_count = Sent} = S) ->
%%lager:debug("~p: sending request from ~p to prxoy app ~p", [self(), FromPid, Port]),
D = p11p_rpc:serialise(Request),
Buf = case Sent of
0 -> <<?RPC_VERSION:8, D/binary>>;
_ -> D
end,
ok = do_send(Port, Buf),
{reply, {ok, sizeBuf}, S#state{replyto = FromPid, timer = start_timer(Port),
send_count = Sent + 1}};
handle_call(Call, _From, State) ->
lager:debug("~p: Unhandled call: ~p~n", [self(), Call]),
{reply, unhandled, State}.
handle_cast({stop, Reason}, State) ->
{stop, Reason, State};
handle_cast(Cast, State) ->
lager:debug("~p: unhandled cast: ~p~n", [self(), Cast]),
{noreply, State}.
%% Receiving the very first response from proxy app since it was started.
handle_info({Port, {data, Data}}, State)
when Port == State#state.port, State#state.msg == undefined ->
case hd(Data) of % First octet is RPC protocol version.
?RPC_VERSION ->
{noreply, handle_proxy_app_data(State, p11p_rpc:new(), tl(Data))};
BadVersion ->
lager:info("~p: ~p: invalid RPC version: ~p", [self(), Port,
BadVersion]),
{noreply, State}
end;
%% Receiving more data from proxy app.
handle_info({Port, {data, Data}}, #state{msg = Msg} = State)
when Port == State#state.port ->
{noreply, handle_proxy_app_data(State, Msg, Data)};
%% Proxy app timed out.
handle_info({timeout, Timer, Port}, #state{token = Tok, replyto = Server} = S)
when Port == S#state.port, Timer == S#state.timer ->
lager:info("~p: rpc request timed out, exiting", [self()]),
p11p_manager:server_event(timeout, [Tok, Server]),
State = S#state{timer = undefined},
{stop, normal, State};
handle_info(Info, State) ->
lager:debug("~p: Unhandled info: ~p~n", [self(), Info]),
{noreply, State}.
terminate(Reason, #state{port = Port}) ->
lager:debug("~p: client terminating with reason ~p", [self(), Reason]),
port_close(Port),
ok.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
%% Private
do_send(Port, Buf) ->
%%lager:debug("~p: sending ~B octets to proxy app", [self(), size(Buf)]),
%% case rand:uniform(15) of
%% 1 ->
%% lager:debug("~p: faking unresponsive proxy app (~p) by not sending it any.", [self(), Port]);
%% _ ->
%% port_command(Port, Buf)
%% end,
true = port_command(Port, Buf),
ok.
handle_proxy_app_data(#state{replyto = Pid, timer = Timer, recv_count = Recv} = S,
MsgIn, DataIn) ->
case p11p_rpc:parse(MsgIn, list_to_binary(DataIn)) of
{needmore, Msg} ->
S#state{msg = Msg};
{done, Msg} ->
cancel_timer(Timer),
{ok, _BytesSent} = p11p_server:reply(Pid, Msg),
%% Saving potential data not consumed by parse/2 in new message.
S#state{msg = p11p_rpc:new(Msg#p11rpc_msg.buffer),
recv_count = Recv + 1}
end.
start_timer(Port) ->
%%lager:debug("~p: starting timer", [self()]),
erlang:start_timer(3000, self(), Port).
cancel_timer(Timer) ->
%%lager:debug("~p: canceling timer", [self()]),
erlang:cancel_timer(Timer, [{async, true}, {info, false}]).
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