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;
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();
60 -- Load modules when a host is activated
61 function load_modules_for_host(host)
62 -- Load modules from global section
63 local modules_enabled = config.get("*", "core", "modules_enabled");
64 local modules_disabled = config.get(host, "core", "modules_disabled");
65 local disabled_set = {};
66 if modules_enabled then
67 if modules_disabled then
68 for _, module in pairs(modules_disabled) do
69 disabled_set[module] = true;
72 for _, module in pairs(modules_enabled) do
73 if not disabled_set[module] then
79 -- Load modules from just this host
80 local modules_enabled = config.get(host, "core", "modules_enabled");
81 if modules_enabled then
82 for _, module in pairs(modules_enabled) do
83 if not is_loaded(host, module) then
89 eventmanager.add_event_hook("host-activated", load_modules_for_host);
92 function load(host, module_name, config)
93 if not (host and module_name) then
94 return nil, "insufficient-parameters";
97 if not modulemap[host] then
99 elseif 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(plugin_dir.."mod_"..module_name..".lua");
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);
120 local success, ret = pcall(mod);
122 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
126 -- Use modified host, if the module set one
127 modulemap[api_instance.host][module_name] = pluginenv;
132 function is_loaded(host, name)
133 return modulemap[host] and modulemap[host][name] and true;
136 function unload(host, name, ...)
137 local mod = modulemap[host] and modulemap[host][name];
138 if not mod then return nil, "module-not-loaded"; end
140 if type(rawget(mod, "unload")) == "function" then
141 local ok, err = pcall(rawget(mod, "unload"), ...)
142 if (not ok) and err then
143 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
146 modulemap[host][name] = nil;
147 features_table:remove(host, name);
148 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
149 for _, param in pairs(params) do
150 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
151 handler_info[handlers[1]] = nil;
152 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
157 function handle_stanza(host, origin, stanza)
158 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
159 if name == "iq" and xmlns == "jabber:client" then
160 if stanza.attr.type == "get" or stanza.attr.type == "set" then
161 xmlns = stanza.tags[1].attr.xmlns;
162 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
164 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
168 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
170 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
171 (handlers[1])(origin, stanza);
174 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
178 ----- API functions exposed to modules -----------
179 -- Must all be in api.*
181 -- Returns the name of the current module
182 function api:get_name()
186 -- Returns the host that the current module is serving
187 function api:get_host()
191 local function _add_handler(module, origin_type, tag, xmlns, handler)
192 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
193 local msg = (tag == "iq") and "namespace" or "payload namespace";
195 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
196 handler_info[handler] = module;
197 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
198 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
200 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);
204 function api:add_handler(origin_type, tag, xmlns, handler)
205 if not (origin_type and tag and xmlns and handler) then return false; end
206 if type(origin_type) == "table" then
207 for _, origin_type in ipairs(origin_type) do
208 _add_handler(self, origin_type, tag, xmlns, handler);
211 _add_handler(self, origin_type, tag, xmlns, handler);
214 function api:add_iq_handler(origin_type, xmlns, handler)
215 self:add_handler(origin_type, "iq", xmlns, handler);
218 addDiscoInfoHandler("*host", function(reply, to, from, node)
221 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
222 for feature in pairs(features) do
223 if not done[feature] then
224 reply:tag("feature", {var = feature}):up(); -- TODO cache
225 done[feature] = true;
229 return next(done) ~= nil;
233 function api:add_feature(xmlns)
234 features_table:set(self.host, self.name, xmlns, true);
237 function api:add_event_hook (...) return eventmanager.add_event_hook(...); end
239 --------------------------------------------------------------------