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270 lines
8.5 KiB
270 lines
8.5 KiB
-- Prosody IM v0.2
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-- Copyright (C) 2008 Matthew Wild
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-- Copyright (C) 2008 Waqas Hussain
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--
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-- This program is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU General Public License
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-- as published by the Free Software Foundation; either version 2
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-- of the License, or (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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--
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local plugin_dir = CFG_PLUGINDIR or "./plugins/";
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local logger = require "util.logger";
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local log = logger.init("modulemanager");
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local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
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local eventmanager = require "core.eventmanager";
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local config = require "core.configmanager";
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local multitable_new = require "util.multitable".new;
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local register_actions = require "core.actions".register;
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local loadfile, pcall = loadfile, pcall;
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local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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local pairs, ipairs = pairs, ipairs;
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local t_insert = table.insert;
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local type = type;
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local next = next;
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local rawget = rawget;
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local tostring, print = tostring, print;
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-- We need this to let modules access the real global namespace
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local _G = _G;
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module "modulemanager"
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local api = {}; -- Module API container
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local modulemap = { ["*"] = {} };
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local stanza_handlers = multitable_new();
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local handler_info = {};
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local modulehelpers = setmetatable({}, { __index = _G });
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local features_table = multitable_new();
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local handler_table = multitable_new();
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local hooked = multitable_new();
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local event_hooks = multitable_new();
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local NULL = {};
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-- Load modules when a host is activated
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function load_modules_for_host(host)
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-- Load modules from global section
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local modules_enabled = config.get("*", "core", "modules_enabled");
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local modules_disabled = config.get(host, "core", "modules_disabled");
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local disabled_set = {};
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if modules_enabled then
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if modules_disabled then
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for _, module in ipairs(modules_disabled) do
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disabled_set[module] = true;
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end
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end
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for _, module in ipairs(modules_enabled) do
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if not disabled_set[module] then
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load(host, module);
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end
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end
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end
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-- Load modules from just this host
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local modules_enabled = config.get(host, "core", "modules_enabled");
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if modules_enabled then
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for _, module in pairs(modules_enabled) do
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if not is_loaded(host, module) then
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load(host, module);
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end
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end
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end
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end
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eventmanager.add_event_hook("host-activated", load_modules_for_host);
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--
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function load(host, module_name, config)
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if not (host and module_name) then
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return nil, "insufficient-parameters";
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end
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if not modulemap[host] then
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modulemap[host] = {};
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elseif modulemap[host][module_name] then
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log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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return nil, "module-already-loaded";
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elseif modulemap["*"][module_name] then
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return nil, "global-module-already-loaded";
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end
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local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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if not mod then
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log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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return nil, err;
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end
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local _log = logger.init(host..":"..module_name);
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local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
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local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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setfenv(mod, pluginenv);
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local success, ret = pcall(mod);
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if not success then
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log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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return nil, ret;
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end
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-- Use modified host, if the module set one
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modulemap[api_instance.host][module_name] = pluginenv;
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return true;
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end
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function is_loaded(host, name)
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return modulemap[host] and modulemap[host][name] and true;
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end
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function unload(host, name, ...)
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local mod = modulemap[host] and modulemap[host][name];
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if not mod then return nil, "module-not-loaded"; end
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if type(rawget(mod, "unload")) == "function" then
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local ok, err = pcall(rawget(mod, "unload"), ...)
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if (not ok) and err then
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log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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end
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end
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modulemap[host][name] = nil;
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features_table:remove(host, name);
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local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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for _, param in pairs(params) do
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local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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handler_info[handlers[1]] = nil;
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stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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end
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event_hooks:remove(host, name);
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return true;
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end
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function handle_stanza(host, origin, stanza)
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local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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if name == "iq" and xmlns == "jabber:client" then
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if stanza.attr.type == "get" or stanza.attr.type == "set" then
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xmlns = stanza.tags[1].attr.xmlns;
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log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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else
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log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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return true;
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end
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end
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local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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if handlers then
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log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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(handlers[1])(origin, stanza);
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return true;
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else
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log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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end
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end
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----- API functions exposed to modules -----------
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-- Must all be in api.*
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-- Returns the name of the current module
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function api:get_name()
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return self.name;
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end
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-- Returns the host that the current module is serving
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function api:get_host()
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return self.host;
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end
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local function _add_handler(module, origin_type, tag, xmlns, handler)
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local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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local msg = (tag == "iq") and "namespace" or "payload namespace";
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if not handlers then
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stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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handler_info[handler] = module;
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handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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else
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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);
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end
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end
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function api:add_handler(origin_type, tag, xmlns, handler)
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if not (origin_type and tag and xmlns and handler) then return false; end
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if type(origin_type) == "table" then
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for _, origin_type in ipairs(origin_type) do
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_add_handler(self, origin_type, tag, xmlns, handler);
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end
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else
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_add_handler(self, origin_type, tag, xmlns, handler);
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end
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end
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function api:add_iq_handler(origin_type, xmlns, handler)
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self:add_handler(origin_type, "iq", xmlns, handler);
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end
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addDiscoInfoHandler("*host", function(reply, to, from, node)
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if #node == 0 then
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local done = {};
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for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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for feature in pairs(features) do
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if not done[feature] then
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reply:tag("feature", {var = feature}):up(); -- TODO cache
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done[feature] = true;
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end
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end
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end
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return next(done) ~= nil;
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end
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end);
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function api:add_feature(xmlns)
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features_table:set(self.host, self.name, xmlns, true);
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end
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local event_hook = function(host, mod_name, event_name, ...)
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if type((...)) == "table" and (...).host and (...).host ~= host then return; end
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for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
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handler(...);
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end
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end;
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function api:add_event_hook(name, handler)
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if not hooked:get(self.host, self.name, name) then
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eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
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hooked:set(self.host, self.name, name, true);
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end
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event_hooks:set(self.host, self.name, name, handler, true);
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end
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--------------------------------------------------------------------
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local actions = {};
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function actions.load(params)
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--return true, "Module loaded ("..params.module.." on "..params.host..")";
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return load(params.host, params.module);
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end
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function actions.unload(params)
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return unload(params.host, params.module);
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end
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register_actions("/modules", actions);
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return _M;
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