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%%%-------------------------------------------------------------------
%%% @author Micael Karlberg <[email protected]>
%%% @copyright (C) 2018, Micael Karlberg
%%% @doc
%%%
%%% @end
%%% Created : 27 Jun 2018 by Micael Karlberg <[email protected]>
%%%-------------------------------------------------------------------
-module(socket_server).
-export([start/0]).
-record(handler, {socket, parent}).
start() ->
start_tcp().
start_tcp() ->
start(inet, stream, tcp).
start(Domain, Type, Proto) ->
put(sname, "starter"),
try do_init(Domain, Type, Proto) of
Sock ->
accept_loop(Sock)
catch
throw:E:P ->
e("Failed initiate: "
"~n Error: ~p"
"~n Path: ~p", [E, P])
end.
do_init(Domain, Type, Proto) ->
i("try (socket) open"),
Sock = case socket:open(Domain, Type, Proto) of
{ok, S} ->
S;
{error, OReason} ->
throw({open, OReason})
end,
i("opened - now try find (local) address"),
Addr = which_addr(Domain),
SA = #{family => Domain,
addr => Addr},
i("addr ~p - now try (socket) bind", [Addr]),
Port = case socket:bind(Sock, SA) of
{ok, P} ->
P;
{error, BReason} ->
throw({bind, BReason})
end,
i("bound to ~w - now try (socket) listen", [Port]),
case socket:listen(Sock) of
ok ->
Sock;
{error, LReason} ->
throw({listen, LReason})
end.
which_addr(Domain) ->
Iflist = case inet:getifaddrs() of
{ok, IFL} ->
IFL;
{error, Reason} ->
throw({inet,getifaddrs,Reason})
end,
which_addr(Domain, Iflist).
which_addr(_Domain, []) ->
throw(no_address);
which_addr(Domain, [{Name, IFO}|_IFL]) when (Name =/= "lo") ->
which_addr2(Domain, IFO);
which_addr(Domain, [_|IFL]) ->
which_addr(Domain, IFL).
which_addr2(inet = _Domain, [{addr, Addr}|_IFO]) when (size(Addr) =:= 4) ->
Addr;
which_addr2(inet6 = _Domain, [{addr, Addr}|_IFO]) when (size(Addr) =:= 8) ->
Addr;
which_addr2(Domain, [_|IFO]) ->
which_addr2(Domain, IFO).
accept_loop(LSock) ->
put(sname, "accept-loop"),
accept_loop(LSock, []).
accept_loop(LSock, Handlers) ->
i("try accept"),
case socket:accept(LSock, infinity) of
{ok, Sock} ->
i("accepted: ~p", [Sock]),
case handle_accept_success(Sock) of
{ok, Handler} ->
accept_loop(LSock, [Handler|Handlers]);
{error, HReason} ->
e("Failed starting handler: "
"~n ~p", [HReason]),
socket:close(Sock),
exit({failed_starting_handler, HReason})
end;
{error, Reason} ->
e("accept failure: "
"~n ~p", [Reason]),
exit({accept, Reason})
end.
handle_accept_success(Sock) ->
Self = self(),
Handler = spawn_link(fun() -> handler_init(Self, Sock) end),
case socket:setopt(Sock, otp, controlling_process, Handler) of
ok ->
%% Normally we should have a msgs collection here
%% (of messages we receive before the control was
%% handled over to Handler), but since we don't
%% have active implemented yet...
handler_continue(Handler),
{ok, {Handler, Sock}};
{error, _} = ERROR ->
exit(Handler, kill),
ERROR
end.
handler_init(Parent, Socket) ->
put(sname, "handler"),
receive
{handler, Parent, continue} ->
handler_loop(#handler{parent = Parent,
socket = Socket})
end.
handler_continue(Handler) ->
Handler ! {handler, self(), continue}.
handler_loop(#handler{socket = Socket} = H) ->
case socket:read(Socket, 0) of
{ok, <<0:32, N:32, ReqData/binary>>} ->
i("received request ~w: "
"~n ~p", [N, ReqData]),
Reply = <<1:32, N:32, ReqData/binary>>,
case socket:send(Socket, Reply) of
ok ->
i("successfully sent reply ~w", [N]),
handler_loop(H);
{error, SReason} ->
e("failed sending reply ~w:"
"~n ~p", [N, SReason]),
exit({failed_sending_reply, SReason})
end;
{error, RReason} ->
e("failed reading request: "
"~n ~p", [RReason]),
exit({failed_sending_reply, RReason})
end.
e(F, A) ->
p("<ERROR> " ++ F, A).
i(F) ->
i(F, []).
i(F, A) ->
p("*** " ++ F, A).
p(F, A) ->
p(get(sname), F, A).
p(SName, F, A) ->
io:format("[server,~s] " ++ F ++ "~n", [SName|A]).
|
