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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_client).
-export([start/1]).
-define(REQ, 0).
-define(REP, 1).
start(Port) ->
start_tcp(Port).
start_tcp(Port) ->
start(inet, stream, tcp, Port).
start(Domain, Type, Proto, Port) ->
try do_init(Domain, Type, Proto) of
Sock ->
connect(Sock, Domain, Port),
%% Give the server some time...
p("wait some", []),
%% sleep(5000),
%% ok = socket:close(Sock),
send_loop(Sock)
catch
throw:E ->
e("Failed initiate: "
"~n Error: ~p", [E])
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("try (socket) bind"),
case socket:bind(Sock, any) of
{ok, _P} ->
Sock;
{error, BReason} ->
throw({bind, BReason})
end.
which_addr(Domain) ->
Iflist = case inet:getifaddrs() of
{ok, IFL} ->
IFL;
{error, Reason} ->
throw({inet,getifaddrs,Reason})
end,
which_addr(Domain, Iflist).
connect(Sock, Domain, Port) ->
Addr = which_addr(Domain),
SA = #{family => Domain,
addr => Addr,
port => Port},
i("try (socket) connect to:"
"~n ~p", [SA]),
case socket:connect(Sock, SA) of
ok ->
i("connected"),
ok;
{error, Reason} ->
e("connect failure: "
"~n ~p", [Reason]),
exit({connect, Reason})
end.
send_loop(Sock) ->
send_loop(Sock, 1).
send_loop(Sock, N) when (N =< 10) ->
i("try send request ~w", [N]),
Req = enc_req_msg(N, "hejsan"),
case socket:send(Sock, Req) of
ok ->
i("request ~w sent - now try read answer", [N]),
case socket:recv(Sock, 0) of
{ok, Msg} ->
i("received ~w bytes of data", [size(Msg)]),
case dec_msg(Msg) of
{reply, N, Reply} ->
i("received reply ~w: ~p", [N, Reply]),
send_loop(Sock, N+1)
end;
{error, RReason} ->
e("Failed recv response for request ~w: "
"~n ~p", [N, RReason]),
exit({failed_recv, RReason})
end;
{error, SReason} ->
e("Failed send request ~w: "
"~n ~p", [SReason]),
exit({failed_send, SReason})
end;
send_loop(Sock, _N) ->
i("we are done - close the socket when: "
"~n ~p", [socket:info()]),
ok = socket:close(Sock),
i("we are done - socket closed when: "
"~n ~p", [socket:info()]).
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).
%% ---
enc_req_msg(N, Data) ->
enc_msg(?REQ, N, Data).
enc_rep_msg(N, Data) ->
enc_msg(?REP, N, Data).
enc_msg(Type, N, Data) when is_list(Data) ->
enc_msg(Type, N, list_to_binary(Data));
enc_msg(Type, N, Data)
when is_integer(Type) andalso is_integer(N) andalso is_binary(Data) ->
<<Type:32/integer, N:32/integer, Data/binary>>.
dec_msg(<<?REQ:32/integer, N:32/integer, Data/binary>>) ->
{request, N, Data};
dec_msg(<<?REP:32/integer, N:32/integer, Data/binary>>) ->
{reply, N, Data}.
%% ---
sleep(T) ->
receive after T -> ok end.
%% ---
formated_timestamp() ->
format_timestamp(os:timestamp()).
format_timestamp(Now) ->
N2T = fun(N) -> calendar:now_to_local_time(N) end,
format_timestamp(Now, N2T, true).
format_timestamp({_N1, _N2, N3} = N, N2T, true) ->
FormatExtra = ".~.2.0w",
ArgsExtra = [N3 div 10000],
format_timestamp(N, N2T, FormatExtra, ArgsExtra);
format_timestamp({_N1, _N2, _N3} = N, N2T, false) ->
FormatExtra = "",
ArgsExtra = [],
format_timestamp(N, N2T, FormatExtra, ArgsExtra).
format_timestamp(N, N2T, FormatExtra, ArgsExtra) ->
{Date, Time} = N2T(N),
{YYYY,MM,DD} = Date,
{Hour,Min,Sec} = Time,
FormatDate =
io_lib:format("~.4w-~.2.0w-~.2.0w ~.2.0w:~.2.0w:~.2.0w" ++ FormatExtra,
[YYYY, MM, DD, Hour, Min, Sec] ++ ArgsExtra),
lists:flatten(FormatDate).
%% ---
e(F, A) ->
p("<ERROR> " ++ F, A).
i(F) ->
i(F, []).
i(F, A) ->
p("*** " ++ F, A).
p(F, A) ->
io:format("[client,~p][~s] " ++ F ++ "~n", [self(),formated_timestamp()|A]).
|
