2 -- Copyright (C) 2008-2009 Matthew Wild
3 -- Copyright (C) 2008-2009 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
11 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
13 local logger = require "util.logger";
14 local log = logger.init("modulemanager");
15 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
16 local eventmanager = require "core.eventmanager";
17 local config = require "core.configmanager";
18 local multitable_new = require "util.multitable".new;
19 local register_actions = require "core.actions".register;
20 local st = require "util.stanza";
24 local loadfile, pcall = loadfile, pcall;
25 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
26 local pairs, ipairs = pairs, ipairs;
27 local t_insert, t_concat = table.insert, table.concat;
30 local rawget = rawget;
32 local tostring = tostring;
34 -- We need this to let modules access the real global namespace
37 module "modulemanager"
39 local api = {}; -- Module API container
41 local modulemap = { ["*"] = {} };
43 local stanza_handlers = multitable_new();
44 local handler_info = {};
46 local modulehelpers = setmetatable({}, { __index = _G });
48 local features_table = multitable_new();
49 local handler_table = multitable_new();
50 local hooked = multitable_new();
51 local event_hooks = multitable_new();
55 -- Load modules when a host is activated
56 function load_modules_for_host(host)
57 if config.get(host, "core", "modules_enable") == false then
58 return; -- Only load for hosts, not components, etc.
61 -- Load modules from global section
62 local modules_enabled = config.get("*", "core", "modules_enabled");
63 local modules_disabled = config.get(host, "core", "modules_disabled");
64 local disabled_set = {};
65 if modules_enabled then
66 if modules_disabled then
67 for _, module in ipairs(modules_disabled) do
68 disabled_set[module] = true;
71 for _, module in ipairs(modules_enabled) do
72 if not disabled_set[module] then
78 -- Load modules from just this host
79 local modules_enabled = config.get(host, "core", "modules_enabled");
80 if modules_enabled then
81 for _, module in pairs(modules_enabled) do
82 if not is_loaded(host, module) then
88 eventmanager.add_event_hook("host-activated", load_modules_for_host);
91 function load(host, module_name, config)
92 if not (host and module_name) then
93 return nil, "insufficient-parameters";
96 if not modulemap[host] then
100 if modulemap[host][module_name] then
101 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
102 return nil, "module-already-loaded";
103 elseif modulemap["*"][module_name] then
104 return nil, "global-module-already-loaded";
108 local mod, err = loadfile(get_module_filename(module_name));
110 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
114 local _log = logger.init(host..":"..module_name);
115 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
117 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
119 setfenv(mod, pluginenv);
120 if not hosts[host] then hosts[host] = { type = "component", host = host, connected = false, s2sout = {} }; end
122 local success, ret = pcall(mod);
124 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
128 -- Use modified host, if the module set one
129 modulemap[api_instance.host][module_name] = pluginenv;
131 if api_instance.host == "*" and host ~= "*" then
132 api_instance:set_global();
138 function get_module(host, name)
139 return modulemap[host] and modulemap[host][name];
142 function is_loaded(host, name)
143 return modulemap[host] and modulemap[host][name] and true;
146 function unload(host, name, ...)
147 local mod = get_module(host, name);
148 if not mod then return nil, "module-not-loaded"; end
150 if module_has_method(mod, "unload") then
151 local ok, err = call_module_method(mod, "unload");
152 if (not ok) and err then
153 log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err);
156 modulemap[host][name] = nil;
157 features_table:remove(host, name);
158 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
159 for _, param in pairs(params or NULL) do
160 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
162 handler_info[handlers[1]] = nil;
163 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
166 event_hooks:remove(host, name);
170 function reload(host, name, ...)
171 local mod = get_module(host, name);
172 if not mod then return nil, "module-not-loaded"; end
174 local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors
176 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
182 if module_has_method(mod, "save") then
183 local ok, ret, err = call_module_method(mod, "save");
187 log("warn", "Error saving module '%s:%s' state: %s", host, module, ret);
188 if not config.get(host, "core", "force_module_reload") then
189 log("warn", "Aborting reload due to error, set force_module_reload to ignore this");
190 return nil, "save-state-failed";
192 log("warn", "Continuing with reload (using the force)");
197 unload(host, name, ...);
198 local ok, err = load(host, name, ...);
200 mod = get_module(host, name);
201 if module_has_method(mod, "restore") then
202 local ok, err = call_module_method(mod, "restore", saved or {})
203 if (not ok) and err then
204 log("warn", "Error restoring module '%s' from '%s': %s", name, host, err);
212 function handle_stanza(host, origin, stanza)
213 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
214 if name == "iq" and xmlns == "jabber:client" then
215 if stanza.attr.type == "get" or stanza.attr.type == "set" then
216 xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
217 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
219 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
223 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
224 if not handlers then handlers = stanza_handlers:get("*", origin_type, name, xmlns); end
226 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
227 (handlers[1])(origin, stanza);
230 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin.type, stanza.name, xmlns); -- we didn't handle it
231 if stanza.attr.xmlns == "jabber:client" then
232 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
233 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
235 elseif not(name == "features" and xmlns == "http://etherx.jabber.org/streams") then -- FIXME remove check once we handle S2S features
236 origin:close("unsupported-stanza-type");
241 function module_has_method(module, method)
242 return type(module.module[method]) == "function";
245 function call_module_method(module, method, ...)
246 if module_has_method(module, method) then
247 local f = module.module[method];
248 return pcall(f, ...);
250 return false, "no-such-method";
254 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
255 function get_module_filename(name)
256 _modulepath[3] = name;
257 return t_concat(_modulepath);
260 ----- API functions exposed to modules -----------
261 -- Must all be in api.*
263 -- Returns the name of the current module
264 function api:get_name()
268 -- Returns the host that the current module is serving
269 function api:get_host()
273 function api:get_host_type()
274 return hosts[self.host].type;
277 function api:set_global()
280 local _log = logger.init("mod_"..self.name);
281 self.log = function (self, ...) return _log(...); end;
285 local function _add_handler(module, origin_type, tag, xmlns, handler)
286 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
287 local msg = (tag == "iq") and "namespace" or "payload namespace";
289 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
290 handler_info[handler] = module;
291 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
292 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
294 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);
298 function api:add_handler(origin_type, tag, xmlns, handler)
299 if not (origin_type and tag and xmlns and handler) then return false; end
300 if type(origin_type) == "table" then
301 for _, origin_type in ipairs(origin_type) do
302 _add_handler(self, origin_type, tag, xmlns, handler);
305 _add_handler(self, origin_type, tag, xmlns, handler);
308 function api:add_iq_handler(origin_type, xmlns, handler)
309 self:add_handler(origin_type, "iq", xmlns, handler);
312 addDiscoInfoHandler("*host", function(reply, to, from, node)
315 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
316 for feature in pairs(features) do
317 if not done[feature] then
318 reply:tag("feature", {var = feature}):up(); -- TODO cache
319 done[feature] = true;
323 for module, features in pairs(features_table:get("*") or NULL) do -- for each module
324 for feature in pairs(features) do
325 if not done[feature] then
326 reply:tag("feature", {var = feature}):up(); -- TODO cache
327 done[feature] = true;
331 return next(done) ~= nil;
335 function api:add_feature(xmlns)
336 features_table:set(self.host, self.name, xmlns, true);
339 local event_hook = function(host, mod_name, event_name, ...)
340 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
341 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
345 function api:add_event_hook(name, handler)
346 if not hooked:get(self.host, self.name, name) then
347 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
348 hooked:set(self.host, self.name, name, true);
350 event_hooks:set(self.host, self.name, name, handler, true);
353 function api:fire_event(...)
354 return eventmanager.fire_event(...);
357 --------------------------------------------------------------------
361 function actions.load(params)
362 --return true, "Module loaded ("..params.module.." on "..params.host..")";
363 return load(params.host, params.module);
366 function actions.unload(params)
367 return unload(params.host, params.module);
370 register_actions("/modules", actions);