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%% Copyright (c) 2011, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
%% @private
-module(cowboy_acceptor).
-export([start_link/6]). %% API.
-export([acceptor/6]). %% Internal.
%% API.
-spec start_link(inet:socket(), module(), module(), any(),
non_neg_integer(), pid()) -> {ok, pid()}.
start_link(LSocket, Transport, Protocol, Opts, MaxConns, ReqsSup) ->
Pid = spawn_link(?MODULE, acceptor,
[LSocket, Transport, Protocol, Opts, MaxConns, ReqsSup]),
{ok, Pid}.
%% Internal.
-spec acceptor(inet:socket(), module(), module(), any(),
non_neg_integer(), pid()) -> no_return().
acceptor(LSocket, Transport, Protocol, Opts, MaxConns, ReqsSup) ->
case Transport:accept(LSocket, 2000) of
{ok, CSocket} ->
{ok, Pid} = supervisor:start_child(ReqsSup,
[CSocket, Transport, Protocol, Opts]),
Transport:controlling_process(CSocket, Pid),
limit_reqs(MaxConns, ReqsSup);
{error, timeout} ->
ignore;
{error, _Reason} ->
%% @todo Probably do something here. If the socket was closed,
%% we may want to try and listen again on the port?
ignore
end,
?MODULE:acceptor(LSocket, Transport, Protocol, Opts, MaxConns, ReqsSup).
-spec limit_reqs(non_neg_integer(), pid()) -> ok.
limit_reqs(MaxConns, ReqsSup) ->
Counts = supervisor:count_children(ReqsSup),
Active = lists:keyfind(active, 1, Counts),
case Active < MaxConns of
true -> ok;
false -> timer:sleep(1)
end.
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