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;
23 local loadfile, pcall = loadfile, pcall;
24 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
25 local pairs, ipairs = pairs, ipairs;
26 local t_insert, t_concat = table.insert, table.concat;
29 local rawget = rawget;
31 local tostring = tostring;
33 -- We need this to let modules access the real global namespace
36 module "modulemanager"
38 local api = {}; -- Module API container
40 local modulemap = { ["*"] = {} };
42 local stanza_handlers = multitable_new();
43 local handler_info = {};
45 local modulehelpers = setmetatable({}, { __index = _G });
47 local features_table = multitable_new();
48 local handler_table = multitable_new();
49 local hooked = multitable_new();
50 local event_hooks = multitable_new();
54 -- Load modules when a host is activated
55 function load_modules_for_host(host)
56 if config.get(host, "core", "modules_enable") == false then
57 return; -- Only load for hosts, not components, etc.
60 -- Load modules from global section
61 local modules_enabled = config.get("*", "core", "modules_enabled");
62 local modules_disabled = config.get(host, "core", "modules_disabled");
63 local disabled_set = {};
64 if modules_enabled then
65 if modules_disabled then
66 for _, module in ipairs(modules_disabled) do
67 disabled_set[module] = true;
70 for _, module in ipairs(modules_enabled) do
71 if not disabled_set[module] then
77 -- Load modules from just this host
78 local modules_enabled = config.get(host, "core", "modules_enabled");
79 if modules_enabled then
80 for _, module in pairs(modules_enabled) do
81 if not is_loaded(host, module) then
87 eventmanager.add_event_hook("host-activated", load_modules_for_host);
90 function load(host, module_name, config)
91 if not (host and module_name) then
92 return nil, "insufficient-parameters";
95 if not modulemap[host] then
99 if modulemap[host][module_name] then
100 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
101 return nil, "module-already-loaded";
102 elseif modulemap["*"][module_name] then
103 return nil, "global-module-already-loaded";
107 local mod, err = loadfile(get_module_filename(module_name));
109 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
113 local _log = logger.init(host..":"..module_name);
114 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
116 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
118 setfenv(mod, pluginenv);
119 if not hosts[host] then hosts[host] = { type = "component", host = host, connected = false, s2sout = {} }; end
121 local success, ret = pcall(mod);
123 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
127 -- Use modified host, if the module set one
128 modulemap[api_instance.host][module_name] = pluginenv;
130 if api_instance.host == "*" and host ~= "*" then
131 api_instance:set_global();
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 or "jabber:client";
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);
223 if not handlers then handlers = stanza_handlers:get("*", origin_type, name, xmlns); end
225 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
226 (handlers[1])(origin, stanza);
229 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
233 function module_has_method(module, method)
234 return type(module.module[method]) == "function";
237 function call_module_method(module, method, ...)
238 if module_has_method(module, method) then
239 local f = module.module[method];
240 return pcall(f, ...);
242 return false, "no-such-method";
246 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
247 function get_module_filename(name)
248 _modulepath[3] = name;
249 return t_concat(_modulepath);
252 ----- API functions exposed to modules -----------
253 -- Must all be in api.*
255 -- Returns the name of the current module
256 function api:get_name()
260 -- Returns the host that the current module is serving
261 function api:get_host()
265 function api:get_host_type()
266 return hosts[self.host].type;
269 function api:set_global()
272 local _log = logger.init("mod_"..self.name);
273 self.log = function (self, ...) return _log(...); end;
277 local function _add_handler(module, origin_type, tag, xmlns, handler)
278 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
279 local msg = (tag == "iq") and "namespace" or "payload namespace";
281 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
282 handler_info[handler] = module;
283 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
284 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
286 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);
290 function api:add_handler(origin_type, tag, xmlns, handler)
291 if not (origin_type and tag and xmlns and handler) then return false; end
292 if type(origin_type) == "table" then
293 for _, origin_type in ipairs(origin_type) do
294 _add_handler(self, origin_type, tag, xmlns, handler);
297 _add_handler(self, origin_type, tag, xmlns, handler);
300 function api:add_iq_handler(origin_type, xmlns, handler)
301 self:add_handler(origin_type, "iq", xmlns, handler);
304 addDiscoInfoHandler("*host", function(reply, to, from, node)
307 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
308 for feature in pairs(features) do
309 if not done[feature] then
310 reply:tag("feature", {var = feature}):up(); -- TODO cache
311 done[feature] = true;
315 for module, features in pairs(features_table:get("*") 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 return next(done) ~= nil;
327 function api:add_feature(xmlns)
328 features_table:set(self.host, self.name, xmlns, true);
331 local event_hook = function(host, mod_name, event_name, ...)
332 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
333 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
337 function api:add_event_hook(name, handler)
338 if not hooked:get(self.host, self.name, name) then
339 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
340 hooked:set(self.host, self.name, name, true);
342 event_hooks:set(self.host, self.name, name, handler, true);
345 --------------------------------------------------------------------
349 function actions.load(params)
350 --return true, "Module loaded ("..params.module.." on "..params.host..")";
351 return load(params.host, params.module);
354 function actions.unload(params)
355 return unload(params.host, params.module);
358 register_actions("/modules", actions);