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% Copyright 2008 Konrad-Zuse-Zentrum f�r Informationstechnik Berlin
%
% Licensed under the Apache License, Version 2.0 (the "License");
% you may not use this file except in compliance with the License.
% You may obtain a copy of the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS,
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
% See the License for the specific language governing permissions and
% limitations under the License.
%%%-------------------------------------------------------------------
%%% File : comm_connection.erl
%%% Author : Thorsten Schuett <[email protected]>
%%% Description : creates and destroys connections and represents the
%%% endpoint of a connection where messages are received and
%% send from/to the network.
%%%
%%% Created : 18 Apr 2008 by Thorsten Schuett <[email protected]>
%%%-------------------------------------------------------------------
%% @author Thorsten Schuett <[email protected]>
%% @copyright 2008 Konrad-Zuse-Zentrum f�r Informationstechnik Berlin
%% @version $Id $
-module(comm_layer_dir.comm_connection).
-export([send/3, open_new/4, new/3, open_new_async/4]).
-import(config).
-import(gen_tcp).
-import(inet).
-import(io).
-import(io_lib).
-import(log).
-import(timer).
-include("comm_layer.hrl").
%% @doc new accepted connection. called by comm_acceptor
%% @spec new(inet:ip_address(), int(), socket()) -> pid()
new(Address, Port, Socket) ->
spawn(fun () -> loop(Socket, Address, Port) end).
%% @doc open new connection
%% @spec open_new(inet:ip_address(), int(), inet:ip_address(), int()) ->
%% {local_ip, inet:ip_address(), int(), pid(), inet:socket()}
%% | fail
%% | {connection, pid(), inet:socket()}
open_new(Address, Port, undefined, MyPort) ->
Myself = self(),
LocalPid = spawn(fun () ->
case new_connection(Address, Port, MyPort) of
fail ->
Myself ! {new_connection_failed};
Socket ->
{ok, {MyIP, _MyPort}} = inet:sockname(Socket),
Myself ! {new_connection_started, MyIP, MyPort, Socket},
loop(Socket, Address, Port)
end
end),
receive
{new_connection_failed} ->
fail;
{new_connection_started, MyIP, MyPort, S} ->
{local_ip, MyIP, MyPort, LocalPid, S}
end;
open_new(Address, Port, _MyAddress, MyPort) ->
Owner = self(),
LocalPid = spawn(fun () ->
case new_connection(Address, Port, MyPort) of
fail ->
Owner ! {new_connection_failed};
Socket ->
Owner ! {new_connection_started, Socket},
loop(Socket, Address, Port)
end
end),
receive
{new_connection_failed} ->
fail;
{new_connection_started, Socket} ->
{connection, LocalPid, Socket}
end.
% ===============================================================================
% @doc open a new connection asynchronously
% ===============================================================================
-spec(open_new_async/4 :: (any(), any(), any(), any()) -> pid()).
open_new_async(Address, Port, _MyAddr, MyPort) ->
Pid = spawn(fun () ->
case new_connection(Address, Port, MyPort) of
fail ->
comm_port:unregister_connection(Address, Port),
ok;
Socket ->
loop(Socket, Address, Port)
end
end),
Pid.
send({Address, Port, Socket}, Pid, Message) ->
BinaryMessage = term_to_binary({deliver, Pid, Message}),
SendTimeout = config:read(tcp_send_timeout),
{Time, Result} = timer:tc(gen_tcp, send, [Socket, BinaryMessage]),
if
Time > 1200 * SendTimeout ->
log:log(error,"[ CC ] send to ~p took ~p: ~p",
[Address, Time, inet:getopts(Socket, [keep_alive, send_timeout])]);
true ->
ok
end,
case Result of
ok ->
?LOG_MESSAGE(erlang:element(1, Message), byte_size(BinaryMessage)),
ok;
{error, closed} ->
comm_port:unregister_connection(Address, Port),
close_connection(Socket);
{error, _Reason} ->
%log:log(error,"[ CC ] couldn't send to ~p:~p (~p)", [Address, Port, Reason]),
comm_port:unregister_connection(Address, Port),
close_connection(Socket)
end.
loop(fail, Address, Port) ->
comm_port:unregister_connection(Address, Port),
ok;
loop(Socket, Address, Port) ->
receive
{send, Pid, Message} ->
case send({Address, Port, Socket}, Pid, Message) of
ok -> loop(Socket, Address, Port);
_ -> ok
end;
{tcp_closed, Socket} ->
comm_port:unregister_connection(Address, Port),
gen_tcp:close(Socket);
{tcp, Socket, Data} ->
case binary_to_term(Data) of
{deliver, Process, Message} ->
Process ! Message,
inet:setopts(Socket, [{active, once}]),
loop(Socket, Address, Port);
{user_close} ->
comm_port:unregister_connection(Address, Port),
gen_tcp:close(Socket);
{youare, _Address, _Port} ->
%% @TODO what do we get from this information?
inet:setopts(Socket, [{active, once}]),
loop(Socket, Address, Port);
Unknown ->
log:log(warn,"[ CC ] unknown message ~p", [Unknown]),
inet:setopts(Socket, [{active, once}]),
loop(Socket, Address, Port)
end;
{youare, _IP, _Port} ->
loop(Socket, Address, Port);
Unknown ->
log:log(warn,"[ CC ] unknown message2 ~p", [Unknown]) ,
loop(Socket, Address, Port)
end.
% ===============================================================================
-spec(new_connection(inet:ip_address(), integer(), integer()) -> inet:socket() | fail).
new_connection(Address, Port, MyPort) ->
case gen_tcp:connect(Address, Port, [binary, {packet, 4}, {nodelay, true}, {active, once},
{send_timeout, config:read(tcp_send_timeout)}],
config:read(tcp_connect_timeout)) of
{ok, Socket} ->
% send end point data
case inet:sockname(Socket) of
{ok, {MyAddress, _MyPort}} ->
Message = term_to_binary({endpoint, MyAddress, MyPort}),
gen_tcp:send(Socket, Message),
case inet:peername(Socket) of
{ok, {RemoteIP, RemotePort}} ->
YouAre = term_to_binary({youare, RemoteIP, RemotePort}),
gen_tcp:send(Socket, YouAre),
Socket;
{error, _Reason} ->
%log:log(error,"[ CC ] reconnect to ~p because socket is ~p",
% [Address, Reason]),
close_connection(Socket),
new_connection(Address, Port, MyPort)
end;
{error, _Reason} ->
%log:log(error,"[ CC ] reconnect to ~p because socket is ~p",
% [Address, Reason]),
close_connection(Socket),
new_connection(Address, Port, MyPort)
end;
{error, _Reason} ->
%log:log(error,"[ CC ] couldn't connect to ~p:~p (~p)",
%[Address, Port, Reason]),
fail
end.
close_connection(Socket) ->
spawn( fun () ->
gen_tcp:close(Socket)
end ).
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