/
ecallmgr_amqp_pool_worker.erl
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/
ecallmgr_amqp_pool_worker.erl
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%%%-------------------------------------------------------------------
%%% @author James Aimonetti <james@2600hz.org>
%%% @copyright (C) 2011, VoIP INC
%%% @doc
%%% Send/receive AMQP API calls
%%% @end
%%% Created : 19 Sep 2011 by James Aimonetti <james@2600hz.org>
%%%-------------------------------------------------------------------
-module(ecallmgr_amqp_pool_worker).
-behaviour(gen_listener).
%% API
-export([start_link/0, stop/1, start_req/7, handle_req/2]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2, handle_event/2,
terminate/2, code_change/3]).
-include("ecallmgr.hrl").
-define(SERVER, ?MODULE).
-define(RESPONDERS, [
{?MODULE, [{<<"*">>, <<"*">>}]}
]).
-define(BINDINGS, [{self, []}]).
-record(state, {
status = 'free' :: 'free' | 'busy'
,from = 'undefined' :: 'undefined' | {pid(), reference()}
,ref = 'undefined' :: 'undefined' | reference()
,req_ref = 'undefined' :: 'undefined' | reference()
,parent = 'undefined' :: 'undefined' | pid() | atom()
,start = 'undefined' :: 'undefined' | wh_now()
}).
%%%===================================================================
%%% API
%%%===================================================================
handle_req(JObj, Props) ->
gen_listener:cast(props:get_value(server, Props), {response_recv, JObj}).
%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_listener:start_link(?MODULE, [{responders, ?RESPONDERS}
,{bindings, ?BINDINGS}
], []).
stop(Srv) ->
gen_listener:stop(Srv).
-spec start_req/7 :: (pid(), proplist(), fun(), ne_binary(), {pid(), reference()}, pid() | atom(), non_neg_integer()) -> 'ok'.
start_req(Srv, Prop, ApiFun, CallId, From, Parent, Timeout) when is_integer(Timeout) ->
JObj = case wh_json:is_json_object(Prop) of
true -> Prop;
false -> wh_json:from_list(Prop)
end,
JObj1 = wh_json:set_value(<<"Server-ID">>, gen_listener:queue_name(Srv)
,wh_json:set_value(<<"Call-ID">>, CallId, JObj)),
PubFun = fun() -> put(callid, CallId), ApiFun(JObj1) end,
gen_listener:cast(Srv, {employed, From, Parent, PubFun, CallId, Timeout}).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
?LOG("AMQP pool worker started"),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% @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(_Request, _From, State) ->
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({employed, {Pid, _}=From, Parent, PubFun, CallId, Timeout}, #state{status=free}=State) ->
?LOG(CallId, "Employed by ~p via ~p", [Pid, Parent]),
Ref = erlang:monitor(process, Pid),
ReqRef = erlang:start_timer(Timeout, self(), req_timeout),
try
PubFun(),
{noreply, State#state{status=busy, from=From, ref=Ref
,parent=Parent, start=erlang:now()
,req_ref=ReqRef
}}
catch
E:R ->
?LOG("publish fun ~s: ~p", [E,R]),
erlang:cancel_timer(ReqRef),
ecallmgr_amqp_pool:worker_free(Parent, self(), 0),
{noreply, State}
end;
handle_cast({response_recv, JObj}, #state{status=busy, from=From, parent=Parent, ref=Ref
,start=Start, req_ref=ReqRef}) ->
Elapsed = timer:now_diff(erlang:now(), Start),
?LOG("received response after ~b ms, returning to pool ~p", [Elapsed div 1000, Parent]),
erlang:demonitor(Ref, [flush]),
erlang:cancel_timer(ReqRef),
gen_server:reply(From, {ok, JObj}),
ecallmgr_amqp_pool:worker_free(Parent, self(), Elapsed),
{noreply, #state{}};
handle_cast({response_recv, JObj}, State) ->
?LOG("WTF, I'm free, yet receiving a response?"),
?LOG("EvtCat: ~s", [wh_json:get_value(<<"Event-Category">>, JObj)]),
?LOG("EvtName: ~s", [wh_json:get_value(<<"Event-Name">>, JObj)]),
?LOG("SrvID: ~s", [wh_json:get_value(<<"Server-ID">>, JObj)]),
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%%
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_info({'DOWN', Ref, process, Pid, _Info}, #state{status=busy, ref=Ref, parent=Parent}) ->
?LOG_END("requestor (~w) down, giving up on task", [Pid]),
erlang:demonitor(Ref, [flush]),
ecallmgr_amqp_pool:worker_free(Parent, self(), 0),
{noreply, #state{}};
handle_info({timeout, ReqRef, req_timeout}, #state{status=busy, from=From, parent=Parent, ref=Ref
,start=Start, req_ref=ReqRef
}) ->
?LOG("request took too long, timing out caller"),
Elapsed = timer:now_diff(erlang:now(), Start),
?LOG("received response after ~b ms, returning to pool ~p", [Elapsed div 1000, Parent]),
erlang:demonitor(Ref, [flush]),
erlang:cancel_timer(ReqRef),
gen_server:reply(From, {error, timeout}),
ecallmgr_amqp_pool:worker_free(Parent, self(), Elapsed),
{noreply, #state{}};
handle_info(req_timeout, #state{status=busy, from=From, parent=Parent, ref=Ref
,start=Start, req_ref=ReqRef
}) ->
?LOG("request took too long, timing out caller"),
Elapsed = timer:now_diff(erlang:now(), Start),
?LOG("received response after ~b ms, returning to pool ~p", [Elapsed div 1000, Parent]),
erlang:demonitor(Ref, [flush]),
erlang:cancel_timer(ReqRef),
gen_server:reply(From, {error, timeout}),
ecallmgr_amqp_pool:worker_free(Parent, self(), Elapsed),
{noreply, #state{}};
handle_info(_Info, State) ->
?LOG("Unhandled message: ~p", [_Info]),
{noreply, State}.
handle_event(_JObj, _State) ->
{reply, [{server, self()}]}.
%%--------------------------------------------------------------------
%% @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) ->
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
%%%===================================================================