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;
34 local loadfile, pcall = loadfile, pcall;
35 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
36 local pairs, ipairs = pairs, ipairs;
37 local t_insert, t_concat = table.insert, table.concat;
40 local rawget = rawget;
42 local tostring, print = tostring, print;
44 -- We need this to let modules access the real global namespace
47 module "modulemanager"
49 local api = {}; -- Module API container
51 local modulemap = { ["*"] = {} };
53 local stanza_handlers = multitable_new();
54 local handler_info = {};
56 local modulehelpers = setmetatable({}, { __index = _G });
58 local features_table = multitable_new();
59 local handler_table = multitable_new();
60 local hooked = multitable_new();
61 local event_hooks = multitable_new();
65 -- Load modules when a host is activated
66 function load_modules_for_host(host)
67 -- Load modules from global section
68 local modules_enabled = config.get("*", "core", "modules_enabled");
69 local modules_disabled = config.get(host, "core", "modules_disabled");
70 local disabled_set = {};
71 if modules_enabled then
72 if modules_disabled then
73 for _, module in ipairs(modules_disabled) do
74 disabled_set[module] = true;
77 for _, module in ipairs(modules_enabled) do
78 if not disabled_set[module] then
84 -- Load modules from just this host
85 local modules_enabled = config.get(host, "core", "modules_enabled");
86 if modules_enabled then
87 for _, module in pairs(modules_enabled) do
88 if not is_loaded(host, module) then
94 eventmanager.add_event_hook("host-activated", load_modules_for_host);
97 function load(host, module_name, config)
98 if not (host and module_name) then
99 return nil, "insufficient-parameters";
102 if not modulemap[host] then
103 modulemap[host] = {};
104 elseif modulemap[host][module_name] then
105 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
106 return nil, "module-already-loaded";
107 elseif modulemap["*"][module_name] then
108 return nil, "global-module-already-loaded";
112 local mod, err = loadfile(get_module_filename(module_name));
114 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
118 local _log = logger.init(host..":"..module_name);
119 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
121 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
123 setfenv(mod, pluginenv);
125 local success, ret = pcall(mod);
127 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
131 -- Use modified host, if the module set one
132 modulemap[api_instance.host][module_name] = pluginenv;
137 function get_module(host, name)
138 return modulemap[host] and modulemap[host][name];
141 function is_loaded(host, name)
142 return modulemap[host] and modulemap[host][name] and true;
145 function unload(host, name, ...)
146 local mod = get_module(host, name);
147 if not mod then return nil, "module-not-loaded"; end
149 if module_has_method(mod, "unload") then
150 local ok, err = call_module_method(mod, "unload");
151 if (not ok) and err then
152 log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err);
155 modulemap[host][name] = nil;
156 features_table:remove(host, name);
157 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
158 for _, param in pairs(params or NULL) do
159 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
161 handler_info[handlers[1]] = nil;
162 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
165 event_hooks:remove(host, name);
169 function reload(host, name, ...)
170 local mod = get_module(host, name);
171 if not mod then return nil, "module-not-loaded"; end
173 local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors
175 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
181 if module_has_method(mod, "save") then
182 local ok, ret, err = call_module_method(mod, "save");
186 log("warn", "Error saving module '%s:%s' state: %s", host, module, ret);
187 if not config.get(host, "core", "force_module_reload") then
188 log("warn", "Aborting reload due to error, set force_module_reload to ignore this");
189 return nil, "save-state-failed";
191 log("warn", "Continuing with reload (using the force)");
196 unload(host, name, ...);
197 local ok, err = load(host, name, ...);
199 mod = get_module(host, name);
200 if module_has_method(mod, "restore") then
201 local ok, err = call_module_method(mod, "restore", saved or {})
202 if (not ok) and err then
203 log("warn", "Error restoring module '%s' from '%s': %s", name, host, err);
211 function handle_stanza(host, origin, stanza)
212 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
213 if name == "iq" and xmlns == "jabber:client" then
214 if stanza.attr.type == "get" or stanza.attr.type == "set" then
215 xmlns = stanza.tags[1].attr.xmlns;
216 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
218 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
222 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
224 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
225 (handlers[1])(origin, stanza);
228 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
232 function module_has_method(module, method)
233 return type(module.module[method]) == "function";
236 function call_module_method(module, method, ...)
237 if module_has_method(module, method) then
238 local f = module.module[func];
239 return pcall(f, ...);
241 return false, "no-such-method";
245 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
246 function get_module_filename(name)
247 _modulepath[3] = name;
248 return t_concat(_modulepath);
251 ----- API functions exposed to modules -----------
252 -- Must all be in api.*
254 -- Returns the name of the current module
255 function api:get_name()
259 -- Returns the host that the current module is serving
260 function api:get_host()
264 function api:get_host_type()
265 return hosts[self.host].type;
268 function api:set_global()
272 local function _add_handler(module, origin_type, tag, xmlns, handler)
273 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
274 local msg = (tag == "iq") and "namespace" or "payload namespace";
276 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
277 handler_info[handler] = module;
278 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
279 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
281 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);
285 function api:add_handler(origin_type, tag, xmlns, handler)
286 if not (origin_type and tag and xmlns and handler) then return false; end
287 if type(origin_type) == "table" then
288 for _, origin_type in ipairs(origin_type) do
289 _add_handler(self, origin_type, tag, xmlns, handler);
292 _add_handler(self, origin_type, tag, xmlns, handler);
295 function api:add_iq_handler(origin_type, xmlns, handler)
296 self:add_handler(origin_type, "iq", xmlns, handler);
299 addDiscoInfoHandler("*host", function(reply, to, from, node)
302 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
303 for feature in pairs(features) do
304 if not done[feature] then
305 reply:tag("feature", {var = feature}):up(); -- TODO cache
306 done[feature] = true;
310 return next(done) ~= nil;
314 function api:add_feature(xmlns)
315 features_table:set(self.host, self.name, xmlns, true);
318 local event_hook = function(host, mod_name, event_name, ...)
319 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
320 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
324 function api:add_event_hook(name, handler)
325 if not hooked:get(self.host, self.name, name) then
326 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
327 hooked:set(self.host, self.name, name, true);
329 event_hooks:set(self.host, self.name, name, handler, true);
332 --------------------------------------------------------------------
336 function actions.load(params)
337 --return true, "Module loaded ("..params.module.." on "..params.host..")";
338 return load(params.host, params.module);
341 function actions.unload(params)
342 return unload(params.host, params.module);
345 register_actions("/modules", actions);