/
gen_mod.erl
283 lines (235 loc) · 8.78 KB
/
gen_mod.erl
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
%%%----------------------------------------------------------------------
%%% File : gen_mod.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose :
%%% Purpose :
%%% Created : 24 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(gen_mod).
-author('alexey@process-one.net').
-export([start/0, start_module/3, stop_module/2,
stop_module_keep_config/2, get_opt/3, get_opt/4,
get_opt_host/3, db_type/1, db_type/2, get_module_opt/5,
get_module_opt_host/3, loaded_modules/1,
loaded_modules_with_opts/1, get_hosts/2,
get_module_proc/2, is_loaded/2]).
%%-export([behaviour_info/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-record(ejabberd_module,
{module_host = {undefined, <<"">>} :: {atom(), binary()},
opts = [] :: opts() | '_' | '$2'}).
-type opts() :: [{atom(), any()}].
-callback start(binary(), opts()) -> any().
-callback stop(binary()) -> any().
-export_type([opts/0]).
%%behaviour_info(callbacks) -> [{start, 2}, {stop, 1}];
%%behaviour_info(_Other) -> undefined.
start() ->
ets:new(ejabberd_modules,
[named_table, public,
{keypos, #ejabberd_module.module_host}]),
ok.
-spec start_module(binary(), atom(), opts()) -> any().
start_module(Host, Module, Opts) ->
set_module_opts_mnesia(Host, Module, Opts),
ets:insert(ejabberd_modules,
#ejabberd_module{module_host = {Module, Host},
opts = Opts}),
try Module:start(Host, Opts) catch
Class:Reason ->
del_module_mnesia(Host, Module),
ets:delete(ejabberd_modules, {Module, Host}),
ErrorText =
io_lib:format("Problem starting the module ~p for host "
"~p ~n options: ~p~n ~p: ~p~n~p",
[Module, Host, Opts, Class, Reason,
erlang:get_stacktrace()]),
?CRITICAL_MSG(ErrorText, []),
case is_app_running(ejabberd) of
true ->
erlang:raise(Class, Reason, erlang:get_stacktrace());
false ->
?CRITICAL_MSG("ejabberd initialization was aborted "
"because a module start failed.",
[]),
timer:sleep(3000),
erlang:halt(string:substr(lists:flatten(ErrorText), 1, 199))
end
end.
is_app_running(AppName) ->
Timeout = 15000,
lists:keymember(AppName, 1,
application:which_applications(Timeout)).
-spec stop_module(binary(), atom()) -> error | {aborted, any()} | {atomic, any()}.
%% @doc Stop the module in a host, and forget its configuration.
stop_module(Host, Module) ->
case stop_module_keep_config(Host, Module) of
error -> error;
ok -> del_module_mnesia(Host, Module)
end.
%% @doc Stop the module in a host, but keep its configuration.
%% As the module configuration is kept in the Mnesia local_config table,
%% when ejabberd is restarted the module will be started again.
%% This function is useful when ejabberd is being stopped
%% and it stops all modules.
-spec stop_module_keep_config(binary(), atom()) -> error | ok.
stop_module_keep_config(Host, Module) ->
case catch Module:stop(Host) of
{'EXIT', Reason} -> ?ERROR_MSG("~p", [Reason]), error;
{wait, ProcList} when is_list(ProcList) ->
lists:foreach(fun wait_for_process/1, ProcList),
ets:delete(ejabberd_modules, {Module, Host}),
ok;
{wait, Process} ->
wait_for_process(Process),
ets:delete(ejabberd_modules, {Module, Host}),
ok;
_ -> ets:delete(ejabberd_modules, {Module, Host}), ok
end.
wait_for_process(Process) ->
MonitorReference = erlang:monitor(process, Process),
wait_for_stop(Process, MonitorReference).
wait_for_stop(Process, MonitorReference) ->
receive
{'DOWN', MonitorReference, _Type, _Object, _Info} -> ok
after 5000 ->
catch exit(whereis(Process), kill),
wait_for_stop1(MonitorReference)
end.
wait_for_stop1(MonitorReference) ->
receive
{'DOWN', MonitorReference, _Type, _Object, _Info} -> ok
after 5000 -> ok
end.
-type check_fun() :: fun((any()) -> any()) | {module(), atom()}.
-spec get_opt(atom(), opts(), check_fun()) -> any().
get_opt(Opt, Opts, F) ->
get_opt(Opt, Opts, F, undefined).
-spec get_opt(atom(), opts(), check_fun(), any()) -> any().
get_opt(Opt, Opts, F, Default) ->
case lists:keysearch(Opt, 1, Opts) of
false ->
Default;
{value, {_, Val}} ->
ejabberd_config:prepare_opt_val(Opt, Val, F, Default)
end.
-spec get_module_opt(global | binary(), atom(), atom(), check_fun(), any()) -> any().
get_module_opt(global, Module, Opt, F, Default) ->
Hosts = (?MYHOSTS),
[Value | Values] = lists:map(fun (Host) ->
get_module_opt(Host, Module, Opt,
F, Default)
end,
Hosts),
Same_all = lists:all(fun (Other_value) ->
Other_value == Value
end,
Values),
case Same_all of
true -> Value;
false -> Default
end;
get_module_opt(Host, Module, Opt, F, Default) ->
OptsList = ets:lookup(ejabberd_modules, {Module, Host}),
case OptsList of
[] -> Default;
[#ejabberd_module{opts = Opts} | _] ->
get_opt(Opt, Opts, F, Default)
end.
-spec get_module_opt_host(global | binary(), atom(), binary()) -> binary().
get_module_opt_host(Host, Module, Default) ->
Val = get_module_opt(Host, Module, host,
fun iolist_to_binary/1,
Default),
ejabberd_regexp:greplace(Val, <<"@HOST@">>, Host).
-spec get_opt_host(binary(), opts(), binary()) -> binary().
get_opt_host(Host, Opts, Default) ->
Val = get_opt(host, Opts, fun iolist_to_binary/1, Default),
ejabberd_regexp:greplace(Val, <<"@HOST@">>, Host).
-spec db_type(opts()) -> odbc | mnesia.
db_type(Opts) ->
get_opt(db_type, Opts,
fun(odbc) -> odbc;
(internal) -> mnesia;
(mnesia) -> mnesia end,
mnesia).
-spec db_type(binary(), atom()) -> odbc | mnesia.
db_type(Host, Module) ->
get_module_opt(Host, Module, db_type,
fun(odbc) -> odbc;
(internal) -> mnesia;
(mnesia) -> mnesia end,
mnesia).
-spec loaded_modules(binary()) -> [atom()].
loaded_modules(Host) ->
ets:select(ejabberd_modules,
[{#ejabberd_module{_ = '_', module_host = {'$1', Host}},
[], ['$1']}]).
-spec loaded_modules_with_opts(binary()) -> [{atom(), opts()}].
loaded_modules_with_opts(Host) ->
ets:select(ejabberd_modules,
[{#ejabberd_module{_ = '_', module_host = {'$1', Host},
opts = '$2'},
[], [{{'$1', '$2'}}]}]).
set_module_opts_mnesia(Host, Module, Opts) ->
Modules = ejabberd_config:get_local_option(
{modules, Host},
fun(Ls) when is_list(Ls) -> Ls end,
[]),
Modules1 = lists:keydelete(Module, 1, Modules),
Modules2 = [{Module, Opts} | Modules1],
ejabberd_config:add_local_option({modules, Host},
Modules2).
del_module_mnesia(Host, Module) ->
Modules = ejabberd_config:get_local_option(
{modules, Host},
fun(Ls) when is_list(Ls) -> Ls end,
[]),
Modules1 = lists:keydelete(Module, 1, Modules),
ejabberd_config:add_local_option({modules, Host},
Modules1).
-spec get_hosts(opts(), binary()) -> [binary()].
get_hosts(Opts, Prefix) ->
case get_opt(hosts, Opts,
fun(Hs) -> [iolist_to_binary(H) || H <- Hs] end) of
undefined ->
case get_opt(host, Opts,
fun iolist_to_binary/1) of
undefined ->
[<<Prefix/binary, Host/binary>> || Host <- ?MYHOSTS];
Host ->
[Host]
end;
Hosts ->
Hosts
end.
-spec get_module_proc(binary(), {frontend, atom()} | atom()) -> atom().
get_module_proc(Host, {frontend, Base}) ->
get_module_proc(<<"frontend_", Host/binary>>, Base);
get_module_proc(Host, Base) ->
binary_to_atom(
<<(erlang:atom_to_binary(Base, latin1))/binary, "_", Host/binary>>,
latin1).
-spec is_loaded(binary(), atom()) -> boolean().
is_loaded(Host, Module) ->
ets:member(ejabberd_modules, {Module, Host}).