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core/modulemanager.lua @ 4027:81d0ed5787f6
s2smanager: Handle DNS lookup error in response handler
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 24 Dec 2010 04:57:17 +0000 |
parent | 3878:c9de91c4173f |
child | 3967:1a9bcbaeb55a |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local plugin_dir = CFG_PLUGINDIR or "./plugins/"; local logger = require "util.logger"; local log = logger.init("modulemanager"); local config = require "core.configmanager"; local multitable_new = require "util.multitable".new; local st = require "util.stanza"; local pluginloader = require "util.pluginloader"; local hosts = hosts; local prosody = prosody; local prosody_events = prosody.events; local loadfile, pcall, xpcall = loadfile, pcall, xpcall; local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv; local pairs, ipairs = pairs, ipairs; local t_insert, t_concat = table.insert, table.concat; local type = type; local next = next; local rawget = rawget; local error = error; local tostring, tonumber = tostring, tonumber; local debug_traceback = debug.traceback; local unpack, select = unpack, select; pcall = function(f, ...) local n = select("#", ...); local params = {...}; return xpcall(function() return f(unpack(params, 1, n)) end, function(e) return tostring(e).."\n"..debug_traceback(); end); end local array, set = require "util.array", require "util.set"; local autoload_modules = {"presence", "message", "iq"}; local component_inheritable_modules = {"tls", "dialback", "iq"}; -- We need this to let modules access the real global namespace local _G = _G; module "modulemanager" api = {}; local api = api; -- Module API container local modulemap = { ["*"] = {} }; local modulehelpers = setmetatable({}, { __index = _G }); local hooks = multitable_new(); local NULL = {}; -- Load modules when a host is activated function load_modules_for_host(host) local component = config.get(host, "core", "component_module"); local global_modules_enabled = config.get("*", "core", "modules_enabled"); local global_modules_disabled = config.get("*", "core", "modules_disabled"); local host_modules_enabled = config.get(host, "core", "modules_enabled"); local host_modules_disabled = config.get(host, "core", "modules_disabled"); if host_modules_enabled == global_modules_enabled then host_modules_enabled = nil; end if host_modules_disabled == global_modules_disabled then host_modules_disabled = nil; end local host_modules = set.new(host_modules_enabled) - set.new(host_modules_disabled); local global_modules = set.new(autoload_modules) + set.new(global_modules_enabled) - set.new(global_modules_disabled); if component then global_modules = set.intersection(set.new(component_inheritable_modules), global_modules); end local modules = global_modules + host_modules; -- COMPAT w/ pre 0.8 if modules:contains("console") then log("error", "The mod_console plugin has been renamed to mod_admin_telnet. Please update your config."); modules:remove("console"); modules:add("admin_telnet"); end if component then load(host, component); end for module in modules do load(host, module); end end prosody_events.add_handler("host-activated", load_modules_for_host); -- function load(host, module_name, config) if not (host and module_name) then return nil, "insufficient-parameters"; elseif not hosts[host] then return nil, "unknown-host"; end if not modulemap[host] then modulemap[host] = {}; end if modulemap[host][module_name] then log("warn", "%s is already loaded for %s, so not loading again", module_name, host); return nil, "module-already-loaded"; elseif modulemap["*"][module_name] then return nil, "global-module-already-loaded"; end local mod, err = pluginloader.load_code(module_name); if not mod then log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil"); return nil, err; end local _log = logger.init(host..":"..module_name); local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api }); local pluginenv = setmetatable({ module = api_instance }, { __index = _G }); api_instance.environment = pluginenv; setfenv(mod, pluginenv); hosts[host].modules = modulemap[host]; modulemap[host][module_name] = pluginenv; local success, err = pcall(mod); if success then if module_has_method(pluginenv, "load") then success, err = call_module_method(pluginenv, "load"); if not success then log("warn", "Error loading module '%s' on '%s': %s", module_name, host, err or "nil"); end end -- Use modified host, if the module set one if api_instance.host == "*" and host ~= "*" then modulemap[host][module_name] = nil; modulemap["*"][module_name] = pluginenv; api_instance:set_global(); end else log("error", "Error initializing module '%s' on '%s': %s", module_name, host, err or "nil"); end if success then (hosts[api_instance.host] or prosody).events.fire_event("module-loaded", { module = module_name, host = host }); return true; else -- load failed, unloading unload(api_instance.host, module_name); return nil, err; end end function get_module(host, name) return modulemap[host] and modulemap[host][name]; end function is_loaded(host, name) return modulemap[host] and modulemap[host][name] and true; end function unload(host, name, ...) local mod = get_module(host, name); if not mod then return nil, "module-not-loaded"; end if module_has_method(mod, "unload") then local ok, err = call_module_method(mod, "unload"); if (not ok) and err then log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err); end end -- unhook event handlers hooked by module:hook for event, handlers in pairs(hooks:get(host, name) or NULL) do for handler in pairs(handlers or NULL) do (hosts[host] or prosody).events.remove_handler(event, handler); end end hooks:remove(host, name); if mod.module.items then -- remove items for key,t in pairs(mod.module.items) do for i = #t,1,-1 do local value = t[i]; t[i] = nil; hosts[host].events.fire_event("item-removed/"..key, {source = self, item = value}); end end end modulemap[host][name] = nil; (hosts[host] or prosody).events.fire_event("module-unloaded", { module = name, host = host }); return true; end function reload(host, name, ...) local mod = get_module(host, name); if not mod then return nil, "module-not-loaded"; end local _mod, err = pluginloader.load_code(name); -- checking for syntax errors if not _mod then log("error", "Unable to load module '%s': %s", name or "nil", err or "nil"); return nil, err; end local saved; if module_has_method(mod, "save") then local ok, ret, err = call_module_method(mod, "save"); if ok then saved = ret; else log("warn", "Error saving module '%s:%s' state: %s", host, module, ret); if not config.get(host, "core", "force_module_reload") then log("warn", "Aborting reload due to error, set force_module_reload to ignore this"); return nil, "save-state-failed"; else log("warn", "Continuing with reload (using the force)"); end end end unload(host, name, ...); local ok, err = load(host, name, ...); if ok then mod = get_module(host, name); if module_has_method(mod, "restore") then local ok, err = call_module_method(mod, "restore", saved or {}) if (not ok) and err then log("warn", "Error restoring module '%s' from '%s': %s", name, host, err); end end return true; end return ok, err; end function module_has_method(module, method) return type(module.module[method]) == "function"; end function call_module_method(module, method, ...) if module_has_method(module, method) then local f = module.module[method]; return pcall(f, ...); else return false, "no-such-method"; end end ----- API functions exposed to modules ----------- -- Must all be in api.* -- Returns the name of the current module function api:get_name() return self.name; end -- Returns the host that the current module is serving function api:get_host() return self.host; end function api:get_host_type() return hosts[self.host].type; end function api:set_global() self.host = "*"; -- Update the logger local _log = logger.init("mod_"..self.name); self.log = function (self, ...) return _log(...); end; self._log = _log; end function api:add_feature(xmlns) self:add_item("feature", xmlns); end function api:add_identity(category, type, name) self:add_item("identity", {category = category, type = type, name = name}); end function api:fire_event(...) return (hosts[self.host] or prosody).events.fire_event(...); end function api:hook(event, handler, priority) hooks:set(self.host, self.name, event, handler, true); (hosts[self.host] or prosody).events.add_handler(event, handler, priority); end function api:hook_stanza(xmlns, name, handler, priority) if not handler and type(name) == "function" then -- If only 2 options then they specified no xmlns xmlns, name, handler, priority = nil, xmlns, name, handler; elseif not (handler and name) then self:log("warn", "Error: Insufficient parameters to module:hook_stanza()"); return; end return api.hook(self, "stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority); end function api:require(lib) local f, n = pluginloader.load_code(self.name, lib..".lib.lua"); if not f then f, n = pluginloader.load_code(lib, lib..".lib.lua"); end if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message setfenv(f, self.environment); return f(); end function api:get_option(name, default_value) local value = config.get(self.host, self.name, name); if value == nil then value = config.get(self.host, "core", name); if value == nil then value = default_value; end end return value; end function api:get_option_string(name, default_value) local value = self:get_option(name, default_value); if type(value) == "table" then if #value > 1 then self:log("error", "Config option '%s' does not take a list, using just the first item", name); end value = value[1]; end if value == nil then return nil; end return tostring(value); end function api:get_option_number(name, ...) local value = self:get_option(name, ...); if type(value) == "table" then if #value > 1 then self:log("error", "Config option '%s' does not take a list, using just the first item", name); end value = value[1]; end local ret = tonumber(value); if value ~= nil and ret == nil then self:log("error", "Config option '%s' not understood, expecting a number", name); end return ret; end function api:get_option_boolean(name, ...) local value = self:get_option(name, ...); if type(value) == "table" then if #value > 1 then self:log("error", "Config option '%s' does not take a list, using just the first item", name); end value = value[1]; end if value == nil then return nil; end local ret = value == true or value == "true" or value == 1 or nil; if ret == nil then ret = (value == false or value == "false" or value == 0); if ret then ret = false; else ret = nil; end end if ret == nil then self:log("error", "Config option '%s' not understood, expecting true/false", name); end return ret; end function api:get_option_array(name, ...) local value = self:get_option(name, ...); if value == nil then return nil; end if type(value) ~= "table" then return array{ value }; -- Assume any non-list is a single-item list end return array():append(value); -- Clone end function api:get_option_set(name, ...) local value = self:get_option_array(name, ...); if value == nil then return nil; end return set.new(value); end local t_remove = _G.table.remove; local module_items = multitable_new(); function api:add_item(key, value) self.items = self.items or {}; self.items[key] = self.items[key] or {}; t_insert(self.items[key], value); self:fire_event("item-added/"..key, {source = self, item = value}); end function api:remove_item(key, value) local t = self.items and self.items[key] or NULL; for i = #t,1,-1 do if t[i] == value then t_remove(self.items[key], i); self:fire_event("item-removed/"..key, {source = self, item = value}); return value; end end end function api:get_host_items(key) local result = {}; for mod_name, module in pairs(modulemap[self.host]) do module = module.module; if module.items then for _, item in ipairs(module.items[key] or NULL) do t_insert(result, item); end end end for mod_name, module in pairs(modulemap["*"]) do module = module.module; if module.items then for _, item in ipairs(module.items[key] or NULL) do t_insert(result, item); end end end return result; end return _M;