blob: 44ce91f1d94b1de7e3056bb26e4f4b3b55ae9df3 [file] [log] [blame]
%% @author Bob Ippolito <bob@mochimedia.com>
%% @copyright 2010 Mochi Media, Inc.
%%
%% Permission is hereby granted, free of charge, to any person obtaining a
%% copy of this software and associated documentation files (the "Software"),
%% to deal in the Software without restriction, including without limitation
%% the rights to use, copy, modify, merge, publish, distribute, sublicense,
%% and/or sell copies of the Software, and to permit persons to whom the
%% Software is furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
%% THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
%% DEALINGS IN THE SOFTWARE.
%% @doc MochiWeb acceptor.
-module(mochiweb_acceptor).
-author('bob@mochimedia.com').
-include("internal.hrl").
-export([start_link/3, start_link/4, init/4]).
-define(EMFILE_SLEEP_MSEC, 100).
start_link(Server, Listen, Loop) ->
start_link(Server, Listen, Loop, []).
start_link(Server, Listen, Loop, Opts) ->
proc_lib:spawn_link(?MODULE, init, [Server, Listen, Loop, Opts]).
do_accept(Server, Listen) ->
T1 = os:timestamp(),
case mochiweb_socket:transport_accept(Listen) of
{ok, Socket} ->
gen_server:cast(Server, {accepted, self(), timer:now_diff(os:timestamp(), T1)}),
mochiweb_socket:finish_accept(Socket);
Other ->
Other
end.
init(Server, Listen, Loop, Opts) ->
case catch do_accept(Server, Listen) of
{ok, Socket} ->
call_loop(Loop, Socket, Opts);
{error, Err} when Err =:= closed orelse
Err =:= esslaccept orelse
Err =:= timeout ->
exit(normal);
Other ->
%% Mitigate out of file descriptor scenario by sleeping for a
%% short time to slow error rate
case Other of
{error, emfile} ->
receive
after ?EMFILE_SLEEP_MSEC ->
ok
end;
_ ->
ok
end,
error_logger:error_report(
[{application, mochiweb},
"Accept failed error",
lists:flatten(io_lib:format("~p", [Other]))]),
exit({error, accept_failed})
end.
call_loop({M, F}, Socket, Opts) ->
M:F(Socket, Opts);
call_loop({M, F, [A1]}, Socket, Opts) ->
M:F(Socket, Opts, A1);
call_loop({M, F, A}, Socket, Opts) ->
erlang:apply(M, F, [Socket, Opts | A]);
call_loop(Loop, Socket, Opts) ->
Loop(Socket, Opts).