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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(httpd_acceptor).
-include("httpd.hrl").
-include("httpd_internal.hrl").
%%-include("inets_internal.hrl").
%% Internal application API
-export([start_link/7, start_link/8]).
%% Other exports (for spawn's etc.)
-export([acceptor_init/8, acceptor_init/9, acceptor_loop/8]).
%%
%% External API
%%
%% start_link
start_link(Manager, SocketType, Addr, Port, IpFamily, ConfigDb, AcceptTimeout) ->
%% ?hdrd("start link",
%% [{manager, Manager},
%% {socket_type, SocketType},
%% {address, Addr},
%% {port, Port},
%% {timeout, AcceptTimeout}]),
Args = [self(), Manager, SocketType, Addr, Port, IpFamily, ConfigDb, AcceptTimeout],
proc_lib:start_link(?MODULE, acceptor_init, Args).
start_link(Manager, SocketType, Addr, Port, ListenSocket, IpFamily, ConfigDb, AcceptTimeout) ->
%% ?hdrd("start link",
%% [{manager, Manager},
%% {socket_type, SocketType},
%% {listen_socket, ListenSocket},
%% {timeout, AcceptTimeout}]),
Args = [self(), Manager, SocketType, Addr, Port, ListenSocket, IpFamily,
ConfigDb, AcceptTimeout],
proc_lib:start_link(?MODULE, acceptor_init, Args).
acceptor_init(Parent, Manager, SocketType, Addr, Port, {ListenOwner, ListenSocket}, IpFamily,
ConfigDb, AcceptTimeout) ->
%% ?hdrd("acceptor init",
%% [{parent, Parent},
%% {manager, Manager},
%% {socket_type, SocketType},
%% {listen_owner, ListenOwner},
%% {listen_socket, ListenSocket},
%% {timeout, AcceptTimeout}]),
link(ListenOwner),
proc_lib:init_ack(Parent, {ok, self()}),
acceptor_loop(Manager, SocketType, Addr, Port,
ListenSocket, IpFamily, ConfigDb, AcceptTimeout).
acceptor_init(Parent, Manager, SocketType, Addr, Port, IpFamily,
ConfigDb, AcceptTimeout) ->
%% ?hdrd("acceptor init",
%% [{parent, Parent},
%% {manager, Manager},
%% {socket_type, SocketType},
%% {address, Addr},
%% {port, Port},
%% {timeout, AcceptTimeout}]),
case (catch do_init(SocketType, Addr, Port, IpFamily)) of
{ok, ListenSocket} ->
proc_lib:init_ack(Parent, {ok, self()}),
acceptor_loop(Manager, SocketType, Addr, Port,
ListenSocket, IpFamily,ConfigDb, AcceptTimeout);
Error ->
proc_lib:init_ack(Parent, Error),
error
end.
do_init(SocketType, Addr, Port, IpFamily) ->
%% ?hdrt("do init", []),
do_socket_start(SocketType),
ListenSocket = do_socket_listen(SocketType, Addr, Port, IpFamily),
{ok, ListenSocket}.
do_socket_start(SocketType) ->
%% ?hdrt("do socket start", []),
case http_transport:start(SocketType) of
ok ->
ok;
{error, Reason} ->
%% ?hdrv("failed starting transport", [{reason, Reason}]),
throw({error, {socket_start_failed, Reason}})
end.
do_socket_listen(SocketType, Addr, Port, IpFamily) ->
%% ?hdrt("do socket listen", []),
case http_transport:listen(SocketType, Addr, Port, IpFamily) of
{ok, ListenSocket} ->
ListenSocket;
{error, Reason} ->
%% ?hdrv("listen failed", [{reason, Reason},
%% {socket_type, SocketType},
%% {addr, Addr},
%% {port, Port}]),
throw({error, {listen, Reason}})
end.
%% acceptor
acceptor_loop(Manager, SocketType, Addr, Port, ListenSocket, IpFamily, ConfigDb, AcceptTimeout) ->
%% ?hdrd("awaiting accept",
%% [{manager, Manager},
%% {socket_type, SocketType},
%% {listen_socket, ListenSocket},
%% {timeout, AcceptTimeout}]),
case (catch http_transport:accept(SocketType, ListenSocket, 50000)) of
{ok, Socket} ->
%% ?hdrv("accepted", [{socket, Socket}]),
handle_connection(Addr, Port, Manager, ConfigDb, AcceptTimeout,
SocketType, Socket),
?MODULE:acceptor_loop(Manager, SocketType, Addr, Port,
ListenSocket, IpFamily, ConfigDb,AcceptTimeout);
{error, Reason} ->
%% ?hdri("accept failed", [{reason, Reason}]),
handle_error(Reason, ConfigDb),
?MODULE:acceptor_loop(Manager, SocketType, Addr, Port, ListenSocket,
IpFamily, ConfigDb, AcceptTimeout);
{'EXIT', Reason} ->
%% ?hdri("accept exited", [{reason, Reason}]),
ReasonString =
lists:flatten(io_lib:format("Accept exit: ~p", [Reason])),
accept_failed(ConfigDb, ReasonString)
end.
handle_connection(Address, Port, Manager, ConfigDb, AcceptTimeout, SocketType, Socket) ->
Sup = httpd_connection_sup:connection_sup(Address, Port),
{ok, Pid} = httpd_connection_sup:start_child(Sup, [Manager, ConfigDb, AcceptTimeout]),
http_transport:controlling_process(SocketType, Socket, Pid),
httpd_request_handler:socket_ownership_transfered(Pid, SocketType, Socket).
handle_error(timeout, _) ->
ok;
handle_error({enfile, _}, _) ->
%% Out of sockets...
sleep(200);
handle_error(emfile, _) ->
%% Too many open files -> Out of sockets...
sleep(200);
handle_error(closed, _) ->
error_logger:info_report("The httpd accept socket was closed by "
"a third party. "
"This will not have an impact on inets "
"that will open a new accept socket and "
"go on as nothing happened. It does however "
"indicate that some other software is behaving "
"badly."),
exit(normal);
%% This will only happen when the client is terminated abnormaly
%% and is not a problem for the server, so we want
%% to terminate normal so that we can restart without any
%% error messages.
handle_error(econnreset,_) ->
exit(normal);
handle_error(econnaborted, _) ->
ok;
handle_error(esslaccept, _) ->
%% The user has selected to cancel the installation of
%% the certifikate, This is not a real error, so we do
%% not write an error message.
ok;
handle_error(Reason, ConfigDb) ->
String = lists:flatten(io_lib:format("Accept error: ~p", [Reason])),
accept_failed(ConfigDb, String).
-spec accept_failed(ConfigDB :: term(),
ReasonString :: string()) -> no_return().
accept_failed(ConfigDb, String) ->
error_logger:error_report(String),
InitData = #init_data{peername = {0, "unknown"}},
Info = #mod{config_db = ConfigDb, init_data = InitData},
mod_log:error_log(Info, String),
mod_disk_log:error_log(Info, String),
exit({accept_failed, String}).
sleep(T) -> receive after T -> ok end.
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