2 -- Copyright (C) 2008 Matthew Wild
3 -- Copyright (C) 2008 Waqas Hussain
5 -- This program is free software; you can redistribute it and/or
6 -- modify it under the terms of the GNU General Public License
7 -- as published by the Free Software Foundation; either version 2
8 -- of the License, or (at your option) any later version.
10 -- This program is distributed in the hope that it will be useful,
11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 -- GNU General Public License for more details.
15 -- You should have received a copy of the GNU General Public License
16 -- along with this program; if not, write to the Free Software
17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
24 local logger = require "util.logger";
25 local log = logger.init("modulemanager");
26 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
27 local eventmanager = require "core.eventmanager";
28 local config = require "core.configmanager";
29 local multitable_new = require "util.multitable".new;
30 local register_actions = require "core.actions".register;
32 local loadfile, pcall = loadfile, pcall;
33 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
34 local pairs, ipairs = pairs, ipairs;
35 local t_insert = table.insert;
38 local rawget = rawget;
40 local tostring, print = tostring, print;
42 -- We need this to let modules access the real global namespace
45 module "modulemanager"
47 local api = {}; -- Module API container
49 local modulemap = { ["*"] = {} };
51 local stanza_handlers = multitable_new();
52 local handler_info = {};
54 local modulehelpers = setmetatable({}, { __index = _G });
56 local features_table = multitable_new();
57 local handler_table = multitable_new();
58 local hooked = multitable_new();
59 local event_hooks = multitable_new();
63 -- Load modules when a host is activated
64 function load_modules_for_host(host)
65 -- Load modules from global section
66 local modules_enabled = config.get("*", "core", "modules_enabled");
67 local modules_disabled = config.get(host, "core", "modules_disabled");
68 local disabled_set = {};
69 if modules_enabled then
70 if modules_disabled then
71 for _, module in ipairs(modules_disabled) do
72 disabled_set[module] = true;
75 for _, module in ipairs(modules_enabled) do
76 if not disabled_set[module] then
82 -- Load modules from just this host
83 local modules_enabled = config.get(host, "core", "modules_enabled");
84 if modules_enabled then
85 for _, module in pairs(modules_enabled) do
86 if not is_loaded(host, module) then
92 eventmanager.add_event_hook("host-activated", load_modules_for_host);
95 function load(host, module_name, config)
96 if not (host and module_name) then
97 return nil, "insufficient-parameters";
100 if not modulemap[host] then
101 modulemap[host] = {};
102 elseif modulemap[host][module_name] then
103 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
104 return nil, "module-already-loaded";
105 elseif modulemap["*"][module_name] then
106 return nil, "global-module-already-loaded";
110 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
112 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
116 local _log = logger.init(host..":"..module_name);
117 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
119 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
121 setfenv(mod, pluginenv);
123 local success, ret = pcall(mod);
125 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
129 -- Use modified host, if the module set one
130 modulemap[api_instance.host][module_name] = pluginenv;
135 function is_loaded(host, name)
136 return modulemap[host] and modulemap[host][name] and true;
139 function unload(host, name, ...)
140 local mod = modulemap[host] and modulemap[host][name];
141 if not mod then return nil, "module-not-loaded"; end
143 if type(mod.module.unload) == "function" then
144 local ok, err = pcall(mod.module.unload, ...)
145 if (not ok) and err then
146 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
149 modulemap[host][name] = nil;
150 features_table:remove(host, name);
151 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
152 for _, param in pairs(params or NULL) do
153 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
155 handler_info[handlers[1]] = nil;
156 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
159 event_hooks:remove(host, name);
163 function reload(host, name, ...)
164 local mod = modulemap[host] and modulemap[host][name];
165 if not mod then return nil, "module-not-loaded"; end
167 local _mod, err = loadfile(plugin_dir.."mod_"..name..".lua"); -- checking for syntax errors
169 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
174 if type(mod.module.save) == "function" then
175 local ok, err = pcall(mod.module.save)
176 if (not ok) and err then
177 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
183 unload(host, name, ...);
184 if load(host, name, ...) then
185 mod = modulemap[host] and modulemap[host][name];
186 if type(mod.module.restore) == "function" then
187 local ok, err = pcall(mod.module.restore, saved or {})
188 if (not ok) and err then
189 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
196 function handle_stanza(host, origin, stanza)
197 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
198 if name == "iq" and xmlns == "jabber:client" then
199 if stanza.attr.type == "get" or stanza.attr.type == "set" then
200 xmlns = stanza.tags[1].attr.xmlns;
201 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
203 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
207 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
209 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
210 (handlers[1])(origin, stanza);
213 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
217 ----- API functions exposed to modules -----------
218 -- Must all be in api.*
220 -- Returns the name of the current module
221 function api:get_name()
225 -- Returns the host that the current module is serving
226 function api:get_host()
230 local function _add_handler(module, origin_type, tag, xmlns, handler)
231 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
232 local msg = (tag == "iq") and "namespace" or "payload namespace";
234 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
235 handler_info[handler] = module;
236 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
237 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
239 module:log("warn", "I wanted to handle tag '%s' [%s] with %s '%s' but mod_%s already handles that", tag, origin_type, msg, xmlns, handler_info[handlers[1]].module.name);
243 function api:add_handler(origin_type, tag, xmlns, handler)
244 if not (origin_type and tag and xmlns and handler) then return false; end
245 if type(origin_type) == "table" then
246 for _, origin_type in ipairs(origin_type) do
247 _add_handler(self, origin_type, tag, xmlns, handler);
250 _add_handler(self, origin_type, tag, xmlns, handler);
253 function api:add_iq_handler(origin_type, xmlns, handler)
254 self:add_handler(origin_type, "iq", xmlns, handler);
257 addDiscoInfoHandler("*host", function(reply, to, from, node)
260 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
261 for feature in pairs(features) do
262 if not done[feature] then
263 reply:tag("feature", {var = feature}):up(); -- TODO cache
264 done[feature] = true;
268 return next(done) ~= nil;
272 function api:add_feature(xmlns)
273 features_table:set(self.host, self.name, xmlns, true);
276 local event_hook = function(host, mod_name, event_name, ...)
277 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
278 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
282 function api:add_event_hook(name, handler)
283 if not hooked:get(self.host, self.name, name) then
284 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
285 hooked:set(self.host, self.name, name, true);
287 event_hooks:set(self.host, self.name, name, handler, true);
290 --------------------------------------------------------------------
294 function actions.load(params)
295 --return true, "Module loaded ("..params.module.." on "..params.host..")";
296 return load(params.host, params.module);
299 function actions.unload(params)
300 return unload(params.host, params.module);
303 register_actions("/modules", actions);