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|
%%
%% Copyright (C) 2014, Jaguar Land Rover
%%
%% This program is licensed under the terms and conditions of the
%% Mozilla Public License, version 2.0. The full text of the
%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
%%
%%%-------------------------------------------------------------------
%%% @author magnus <magnus@t520.home>
%%% @copyright (C) 2014, magnus
%%% @doc
%%%
%%% @end
%%% Created : 12 Sep 2014 by magnus <magnus@t520.home>
%%%-------------------------------------------------------------------
-module(connection).
-behaviour(gen_server).
-include_lib("lager/include/log.hrl").
%% API
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([setup/6]).
-export([send/2]).
-export([send/3]).
-export([is_connection_up/1]).
-export([is_connection_up/2]).
-export([terminate_connection/1]).
-export([terminate_connection/2]).
-define(SERVER, ?MODULE).
-record(st, {
ip = {0,0,0,0},
port = 0,
sock = undefined,
mod = undefined,
func = undefined,
args = undefined,
pst = undefined %% Payload state
}).
%%%===================================================================
%%% API
%%%===================================================================
%% MFA is to deliver data received on the socket.
setup(IP, Port, Sock, Mod, Fun, Arg) ->
case gen_server:start_link(connection, {IP, Port, Sock, Mod, Fun, Arg},[]) of
{ ok, GenSrvPid } = Res ->
gen_tcp:controlling_process(Sock, GenSrvPid),
gen_server:cast(GenSrvPid, {activate_socket, Sock}),
Res;
Err ->
Err
end.
send(Pid, Data) when is_pid(Pid) ->
gen_server:cast(Pid, {send, Data}).
send(IP, Port, Data) ->
case connection_manager:find_connection_by_address(IP, Port) of
{ok, Pid} ->
gen_server:cast(Pid, {send, Data});
_Err ->
?info("connection:send(): Connection ~p:~p not found for data: ~p",
[ IP, Port, Data]),
not_found
end.
terminate_connection(Pid) when is_pid(Pid) ->
gen_server:call(Pid, terminate_connection).
terminate_connection(IP, Port) ->
case connection_manager:find_connection_by_address(IP, Port) of
{ok, Pid} ->
gen_server:call(Pid, terminate_connection);
_Err -> not_found
end.
is_connection_up(Pid) when is_pid(Pid) ->
is_process_alive(Pid).
is_connection_up(IP, Port) ->
case connection_manager:find_connection_by_address(IP, Port) of
{ok, Pid} ->
is_connection_up(Pid);
_Err ->
false
end.
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @end
%%--------------------------------------------------------------------
%% MFA used to handle socket closed, socket error and received data
%% When data is received, a separate process is spawned to handle
%% the MFA invocation.
init({IP, Port, Sock, Mod, Fun, Arg}) ->
case IP of
undefined -> ok;
_ -> connection_manager:add_connection(IP, Port, self())
end,
?debug("connection:init(): self(): ~p", [self()]),
?debug("connection:init(): IP: ~p", [IP]),
?debug("connection:init(): Port: ~p", [Port]),
?debug("connection:init(): Sock: ~p", [Sock]),
?debug("connection:init(): Module: ~p", [Mod]),
?debug("connection:init(): Function: ~p", [Fun]),
?debug("connection:init(): Arg: ~p", [Arg]),
%% Grab socket control
{ok, #st{
ip = IP,
port = Port,
sock = Sock,
mod = Mod,
func = Fun,
args = Arg,
pst = undefined
}}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling call messages
%%
%% @spec handle_call(Request, From, State) ->
%% {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_call(terminate_connection, _From, St) ->
?debug("~p:handle_call(terminate_connection): Terminating: ~p",
[ ?MODULE, {St#st.ip, St#st.port}]),
{stop, Reason, NSt} = handle_info({tcp_closed, St#st.sock}, St),
{stop, Reason, ok, NSt};
handle_call(_Request, _From, State) ->
?warning("~p:handle_call(): Unknown call: ~p", [ ?MODULE, _Request]),
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling cast messages
%%
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_cast({send, Data}, St) ->
?debug("~p:handle_call(send): Sending: ~p",
[ ?MODULE, Data]),
gen_tcp:send(St#st.sock, Data),
{noreply, St};
handle_cast({activate_socket, Sock}, State) ->
Res = inet:setopts(Sock, [{active, once}]),
?debug("connection:activate_socket(): ~p", [Res]),
{noreply, State};
handle_cast(_Msg, State) ->
?warning("~p:handle_cast(): Unknown call: ~p", [ ?MODULE, _Msg]),
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%%
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
%% Fill in peername if empty.
handle_info({tcp, Sock, Data},
#st { ip = undefined } = St) ->
{ok, {IP, Port}} = inet:peername(Sock),
NSt = St#st { ip = inet_parse:ntoa(IP), port = Port },
?warning("YESSSS"),
handle_info({tcp, Sock, Data}, NSt);
handle_info({tcp, Sock, Data},
#st { ip = IP,
port = Port,
mod = Mod,
func = Fun,
args = Arg,
pst = PST} = State) ->
?debug("~p:handle_info(data): Data: ~p", [ ?MODULE, Data]),
?debug("~p:handle_info(data): From: ~p:~p ", [ ?MODULE, IP, Port]),
case rvi_common:extract_json(Data, PST) of
{ [], NPST } ->
?debug("~p:handle_info(data incomplete)", [ ?MODULE]),
inet:setopts(Sock, [{active, once}]),
{noreply, State#st { pst = NPST} };
{ JSONElements, NPST } ->
?debug("~p:handle_info(data complete): Processed: ~p", [ ?MODULE, JSONElements]),
FromPid = self(),
spawn(fun() -> [ Mod:Fun(FromPid, IP, Port,
data, SingleElem, Arg) || SingleElem <- JSONElements ]
end),
inet:setopts(Sock, [ { active, once } ]),
{noreply, State#st { pst = NPST} }
end;
handle_info({tcp_closed, Sock},
#st { ip = IP,
port = Port,
mod = Mod,
func = Fun,
args = Arg } = State) ->
?debug("~p:handle_info(tcp_closed): Address: ~p:~p ", [ ?MODULE, IP, Port]),
Mod:Fun(self(), IP, Port,closed, Arg),
gen_tcp:close(Sock),
connection_manager:delete_connection_by_pid(self()),
{stop, normal, State};
handle_info({tcp_error, _Sock},
#st { ip = IP,
port = Port,
mod = Mod,
func = Fun,
args = Arg} = State) ->
?debug("~p:handle_info(tcp_error): Address: ~p:~p ", [ ?MODULE, IP, Port]),
Mod:Fun(self(), IP, Port, error, Arg),
connection_manager:delete_connection_by_pid(self()),
{stop, normal, State};
handle_info(_Info, State) ->
?warning("~p:handle_cast(): Unknown info: ~p", [ ?MODULE, _Info]),
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any
%% necessary cleaning up. When it returns, the gen_server terminates
%% with Reason. The return value is ignored.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
?debug("~p:terminate(): Reason: ~p ", [ ?MODULE, _Reason]),
ok.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
|
