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%%% Copyright (c) 2019, Sunet.
%%% See LICENSE for licensing information.
%% Create an AF_UNIX socket and accept connections. On connect, spawn
%% another p11p_server process.
-module(p11p_server).
-behaviour(gen_server).
-include("p11p_rpc.hrl").
%% API.
-export([start_link/1]).
-export([reply/2]).
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-record(state, {
tokname :: string(),
remote :: pid() | undefined,
socket :: gen_tcp:socket(),
msg :: p11rpc_msg() | undefined,
recv_count = 0 :: non_neg_integer(),
send_count = 0 :: non_neg_integer()
%%clientbuf = <<>> :: binary()
}).
%% API.
-spec start_link(gen_tcp:socket()) -> {ok, pid()} | {error, term()}.
start_link(Args) ->
gen_server:start_link(?MODULE, Args, []).
-spec reply(pid(), p11rpc_msg()) -> {ok, non_neg_integer()}.
reply(Pid, Response) ->
gen_server:call(Pid, {respond, Response}).
%% Genserver callbacks.
init([Token, Socket]) ->
lager:debug("~p: p11p_server:init", [self()]),
process_flag(trap_exit, true), % Need terminate/2.
gen_server:cast(self(), accept), % Invoke accept, returning a socket in state.
{ok, #state{tokname = Token, socket = Socket}}.
handle_call({respond, R}, _, #state{socket = Sock, send_count = Sent} = S) ->
D = p11p_rpc:serialise(R),
Buf = case Sent of
0 -> <<?RPC_VERSION:8, D/binary>>;
_ -> D
end,
%%lager:debug("~p: sending ~B octets as response", [self(), size(Buf)]),
ok = gen_tcp:send(Sock, Buf), % TODO: what about short writes?
{reply, {ok, size(Buf)}, S#state{send_count = Sent + 1}};
handle_call(Call, _, S) ->
lager:debug("~p: Unhandled call: ~p~n", [self(), Call]),
{reply, unhandled, S}.
%% Wait for new connection.
handle_cast(accept, State = #state{tokname = TokName, socket = ListenSocket}) ->
%% Blocking until client connects or timeout fires.
%% Without a timeout our supervisor cannot terminate us.
%% On timeout, just invoke ourselves again.
case gen_tcp:accept(ListenSocket, 900) of
{ok, Sock} ->
lager:debug("~p: ~p: new connection accepted", [self(), Sock]),
%% Start a new acceptor and return with new socket in state.
p11p_server_sup:start_server([TokName, ListenSocket]),
{noreply, State#state{socket = Sock}};
{error, timeout} ->
gen_server:cast(self(), accept),
{noreply, State};
{error, closed} ->
lager:debug("~p: listening socket closed", [self()]),
{stop, normal, State}
end;
handle_cast(Cast, State) ->
lager:debug("~p: Unhandled cast: ~p~n", [self(), Cast]),
{noreply, State}.
%% First packet from P11 client.
handle_info({tcp, Port, DataIn}, #state{tokname = TokName} = S)
when S#state.remote == undefined ->
%%lager:debug("~p: received ~B octets from client on socket ~p, from new client", [self(), size(Data), Port]),
<<RPCVersion:8, Data/binary>> = DataIn,
case RPCVersion of
?RPC_VERSION ->
{noreply,
p11_client_data(
S#state{remote = p11p_remote_manager:remote_for_token(TokName)},
p11p_rpc:new(),
Data)};
BadVersion ->
lager:info("~p: ~p: invalid RPC version: ~p", [self(), Port,
BadVersion]),
{stop, bad_proto, S}
end;
%% Subsequent packages from P11 client.
handle_info({tcp, _Port, DataIn}, #state{msg = Msg} = S) ->
%%lager:debug("~p: received ~B octets from client on socket ~p, with ~B octets already in buffer", [self(), size(Data), Port, size(Msg#p11rpc_msg.buffer)]),
{noreply, p11_client_data(S, Msg, DataIn)};
handle_info({tcp_closed, Port}, S) ->
lager:debug("~p: socket ~p closed", [self(), Port]),
{stop, normal, S};
handle_info(Info, S) ->
lager:debug("~p: Unhandled info: ~p~n", [self(), Info]),
{noreply, S}.
terminate(Reason, #state{socket = Sock, tokname = TokName, remote = Remote}) ->
gen_tcp:close(Sock),
p11p_remote_manager:client_event(client_gone, [TokName, Remote]),
lager:debug("~p: terminated with reason ~p", [self(), Reason]),
ignored.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
%% Private functions.
p11_client_data(#state{remote = Remote, recv_count = Recv} = S, MsgIn,
DataIn) ->
case p11p_rpc:parse(MsgIn, DataIn) of
{needmore, Msg} ->
S#state{msg = Msg};
{done, Msg} ->
{ok, _BytesSent} = p11p_remote:request(Remote, Msg),
S#state{msg = p11p_rpc:new(Msg#p11rpc_msg.buffer),
recv_count = Recv + 1}
end.
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