1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
%%
-module(httpd_acceptor).
-include("httpd.hrl").
-include("httpd_internal.hrl").
%% Internal application API
-export([start_link/5, start_link/6]).
%% Other exports (for spawn's etc.)
-export([acceptor_init/6, acceptor_init/7, acceptor_loop/5]).
%%
%% External API
%%
%% start_link
start_link(Manager, SocketType, Addr, Port, ConfigDb, AcceptTimeout) ->
?hdrd("start link",
[{manager, Manager},
{socket_type, SocketType},
{address, Addr},
{port, Port},
{timeout, AcceptTimeout}]),
Args = [self(), Manager, SocketType, Addr, Port, ConfigDb, AcceptTimeout],
proc_lib:start_link(?MODULE, acceptor_init, Args).
start_link(Manager, SocketType, ListenSocket, ConfigDb, AcceptTimeout) ->
?hdrd("start link",
[{manager, Manager},
{socket_type, SocketType},
{listen_socket, ListenSocket},
{timeout, AcceptTimeout}]),
Args = [self(), Manager, SocketType, ListenSocket,
ConfigDb, AcceptTimeout],
proc_lib:start_link(?MODULE, acceptor_init, Args).
acceptor_init(Parent, Manager, SocketType, {ListenOwner, ListenSocket},
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, ListenSocket, ConfigDb, AcceptTimeout).
acceptor_init(Parent, Manager, SocketType, Addr, Port,
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)) of
{ok, ListenSocket} ->
proc_lib:init_ack(Parent, {ok, self()}),
acceptor_loop(Manager, SocketType,
ListenSocket, ConfigDb, AcceptTimeout);
Error ->
proc_lib:init_ack(Parent, Error),
error
end.
do_init(SocketType, Addr, Port) ->
?hdrt("do init", []),
do_socket_start(SocketType),
ListenSocket = do_socket_listen(SocketType, Addr, Port),
{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) ->
?hdrt("do socket listen", []),
case http_transport:listen(SocketType, Addr, Port) 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, ListenSocket, 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(Manager, ConfigDb, AcceptTimeout,
SocketType, Socket),
?MODULE:acceptor_loop(Manager, SocketType,
ListenSocket, ConfigDb,AcceptTimeout);
{error, Reason} ->
?hdri("accept failed", [{reason, Reason}]),
handle_error(Reason, ConfigDb),
?MODULE:acceptor_loop(Manager, SocketType, ListenSocket,
ConfigDb, AcceptTimeout);
{'EXIT', _Reason} = EXIT ->
?hdri("accept exited", [{reason, _Reason}]),
handle_error(EXIT, ConfigDb),
?MODULE:acceptor_loop(Manager, SocketType, ListenSocket,
ConfigDb, AcceptTimeout)
end.
handle_connection(Manager, ConfigDb, AcceptTimeout, SocketType, Socket) ->
{ok, Pid} = httpd_request_handler:start(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({'EXIT', Reason}, ConfigDb) ->
String = lists:flatten(io_lib:format("Accept exit: ~p", [Reason])),
accept_failed(ConfigDb, String);
handle_error(Reason, ConfigDb) ->
String = lists:flatten(io_lib:format("Accept error: ~p", [Reason])),
accept_failed(ConfigDb, String).
-spec accept_failed(_, 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.
|