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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(tcp_listener).
-behaviour(gen_server).
-export([start_link/8]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state, {sock, on_startup, on_shutdown, label}).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(mfargs() :: {atom(), atom(), [any()]}).
-spec(start_link/8 ::
(inet:ip_address(), inet:port_number(), [gen_tcp:listen_option()],
integer(), atom(), mfargs(), mfargs(), string()) ->
rabbit_types:ok_pid_or_error()).
-endif.
%%--------------------------------------------------------------------
start_link(IPAddress, Port, SocketOpts,
ConcurrentAcceptorCount, AcceptorSup,
OnStartup, OnShutdown, Label) ->
gen_server:start_link(
?MODULE, {IPAddress, Port, SocketOpts,
ConcurrentAcceptorCount, AcceptorSup,
OnStartup, OnShutdown, Label}, []).
%%--------------------------------------------------------------------
init({IPAddress, Port, SocketOpts,
ConcurrentAcceptorCount, AcceptorSup,
{M,F,A} = OnStartup, OnShutdown, Label}) ->
process_flag(trap_exit, true),
case gen_tcp:listen(Port, SocketOpts ++ [{ip, IPAddress},
{active, false}]) of
{ok, LSock} ->
lists:foreach(fun (_) ->
{ok, _APid} = supervisor:start_child(
AcceptorSup, [LSock])
end,
lists:duplicate(ConcurrentAcceptorCount, dummy)),
{ok, {LIPAddress, LPort}} = inet:sockname(LSock),
error_logger:info_msg(
"started ~s on ~s:~p~n",
[Label, rabbit_misc:ntoab(LIPAddress), LPort]),
apply(M, F, A ++ [IPAddress, Port]),
{ok, #state{sock = LSock,
on_startup = OnStartup, on_shutdown = OnShutdown,
label = Label}};
{error, Reason} ->
error_logger:error_msg(
"failed to start ~s on ~s:~p - ~p (~s)~n",
[Label, rabbit_misc:ntoab(IPAddress), Port,
Reason, inet:format_error(Reason)]),
{stop, {cannot_listen, IPAddress, Port, Reason}}
end.
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, #state{sock=LSock, on_shutdown = {M,F,A}, label=Label}) ->
{ok, {IPAddress, Port}} = inet:sockname(LSock),
gen_tcp:close(LSock),
error_logger:info_msg("stopped ~s on ~s:~p~n",
[Label, rabbit_misc:ntoab(IPAddress), Port]),
apply(M, F, A ++ [IPAddress, Port]).
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
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