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%% Create an AF_UNIX socket and accept connections. On connect, spawn
%% another p11p_server process.
-module(p11p_server).
-behaviour(gen_server).
%% API.
-export([start_link/1]).
%% Genserver callbacks.
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
%% Records and types.
-include("p11p_defs.hrl").
-record(state, {
sockpath :: string(), % FIXME: filename(3erl)
socket :: gen_tcp:socket()
}).
%% API.
-spec start_link(gen_tcp:socket()) -> {ok, pid()} | {error, term()}.
start_link(Args) ->
lager:debug("~p: p11p_server:start_link enter", [self()]),
gen_server:start_link(?MODULE, Args, []).
%% Genserver callbacks.
init([SocketPath, Socket]) ->
lager:debug("~p: p11p_server:init: ~s", [self(), SocketPath]),
process_flag(trap_exit, true), % We want terminate().
gen_server:cast(self(), accept), % Perform accept in gen-server loop.
{ok, #state{sockpath = SocketPath, socket = Socket}}.
handle_call(Request, _From, State) ->
lager:debug("Unhandled call: ~p~n", [Request]),
{reply, unhandled, State}.
handle_cast(accept, State = #state{sockpath = SocketPath, socket = ListenSocket}) ->
%% Blocking until client connects or timeout fires. Without a
%% timeout our supervisor cannot terminate us.
case gen_tcp:accept(ListenSocket, 900) of
{ok, Sock} ->
%% TODO: authz
lager:debug("~p: ~p: new connection accepted", [self(), Sock]),
p11p_server_sup:start_server([SocketPath, ListenSocket]), % Start a new acceptor.
{noreply, State#state{socket = Sock}}; % Use the new socket.
{error, timeout} ->
gen_server:cast(self(), accept), % Try again.
{noreply, State};
{error, closed} ->
lager:debug("~p: listening socket closed", [self()]),
{stop, normal, State}
end;
handle_cast(Request, State) ->
lager:debug("Unhandled cast: ~p~n", [Request]),
{noreply, State}.
handle_info({tcp, Port, Data}, State) ->
lager:debug("~p: received: ~s", [self(), Data]),
case Data of
<<"q\n">> ->
gen_tcp:send(Port, "ok, bye\n"), %DEBUG
{stop, {shutdown, quit_by_client}, State};
_ ->
gen_tcp:send(Port, "ok, thanks: " ++ Data), %DEBUG
{noreply, State}
end;
handle_info({tcp_closed, Port}, State) ->
lager:debug("~p: ~p: closed", [self(), Port]),
{stop, {shutdown, close_by_client}, State};
handle_info(Info, State) ->
lager:debug("Unhandled info: ~p~n", [Info]),
{noreply, State}.
terminate(_Reason, #state{sockpath = _SocketPath, socket = Socket}) ->
lager:debug("~p: ~p: terminated", [self(), Socket]),
gen_tcp:close(Socket),
%%FIXME: clean up socket file where? file:delete(SocketPath),
ok.
code_change(_OldVersion, State, _Extra) ->
{ok, State}.
%% Private functions.
|
