File

core/modulemanager.lua @ 10649:228277be4a28

net.server_epoll: Reduce log level of TLS handshake errors to debug These are triggered all the time by random HTTPS connections, so they are mostly just useless noise. When you actually do need them, you probably have debug logging enabled too, since these messages are fairly useless without more context.
author Kim Alvefur <zash@zash.se>
date Sat, 15 Feb 2020 16:43:18 +0100
parent 10530:67d56dacc79c
child 11145:be73df6765b9
line wrap: on
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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 logger = require "util.logger";
local log = logger.init("modulemanager");
local config = require "core.configmanager";
local pluginloader = require "util.pluginloader";
local set = require "util.set";

local new_multitable = require "util.multitable".new;
local api = require "core.moduleapi"; -- Module API container

local prosody = prosody;
local hosts = prosody.hosts;

local xpcall = require "util.xpcall".xpcall;
local debug_traceback = debug.traceback;
local setmetatable, rawget = setmetatable, rawget;
local ipairs, pairs, type, t_insert = ipairs, pairs, type, table.insert;

local autoload_modules = {
	prosody.platform,
	"presence",
	"message",
	"iq",
	"offline",
	"c2s",
	"s2s",
	"s2s_auth_certs",
};
local component_inheritable_modules = {
	"tls",
	"saslauth",
	"dialback",
	"iq",
	"s2s",
	"s2s_bidi",
};

-- We need this to let modules access the real global namespace
local _G = _G;

local _ENV = nil;
-- luacheck: std none

local load_modules_for_host, load, unload, reload, get_module, get_items;
local get_modules, is_loaded, module_has_method, call_module_method;

-- [host] = { [module] = module_env }
local modulemap = { ["*"] = {} };

-- Get the list of modules to be loaded on a host
local function get_modules_for_host(host)
	local component = config.get(host, "component_module");

	local global_modules_enabled = config.get("*", "modules_enabled");
	local global_modules_disabled = config.get("*", "modules_disabled");
	local host_modules_enabled = config.get(host, "modules_enabled");
	local host_modules_disabled = config.get(host, "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 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 + set.new(host_modules_enabled)) - set.new(host_modules_disabled);

	-- 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 modules:contains("vcard") and modules:contains("vcard_legacy") then
		log("error", "The mod_vcard_legacy plugin replaces mod_vcard but both are enabled. Please update your config.");
		modules:remove("vcard");
	end

	return modules, component;
end

-- Load modules when a host is activated
function load_modules_for_host(host)
	local modules, component_module = get_modules_for_host(host);

	-- Ensure component module is loaded first
	if component_module then
		load(host, component_module);
	end
	for module in modules do
		load(host, module);
	end
end
prosody.events.add_handler("host-activated", load_modules_for_host);
prosody.events.add_handler("host-deactivated", function (host)
	modulemap[host] = nil;
end);

--- Private helpers ---

local function do_unload_module(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

	for object, event, handler in mod.module.event_handlers:iter(nil, nil, nil) do
		object.remove_handler(event, handler);
	end

	if mod.module.items then -- remove items
		local events = (host == "*" and prosody.events) or hosts[host].events;
		for key,t in pairs(mod.module.items) do
			for i = #t,1,-1 do
				local value = t[i];
				t[i] = nil;
				events.fire_event("item-removed/"..key, {source = mod.module, item = value});
			end
		end
	end
	mod.module.loaded = false;
	modulemap[host][name] = nil;
	return true;
end

local function do_load_module(host, module_name, state)
	if not (host and module_name) then
		return nil, "insufficient-parameters";
	elseif not hosts[host] and host ~= "*"then
		return nil, "unknown-host";
	end

	if not modulemap[host] then
		modulemap[host] = hosts[host].modules;
	end

	if modulemap[host][module_name] then
		if not modulemap["*"][module_name] then
			log("debug", "%s is already loaded for %s, so not loading again", module_name, host);
		end
		return nil, "module-already-loaded";
	elseif modulemap["*"][module_name] then
		local mod = modulemap["*"][module_name];
		if module_has_method(mod, "add_host") then
			local _log = logger.init(host..":"..module_name);
			local host_module_api = setmetatable({
				host = host, event_handlers = new_multitable(), items = {};
				_log = _log, log = function (self, ...) return _log(...); end; --luacheck: ignore 212/self
			},{
				__index = modulemap["*"][module_name].module;
			});
			local host_module = setmetatable({ module = host_module_api }, { __index = mod });
			host_module_api.environment = host_module;
			modulemap[host][module_name] = host_module;
			local ok, result, module_err = call_module_method(mod, "add_host", host_module_api);
			if not ok or result == false then
				modulemap[host][module_name] = nil;
				return nil, ok and module_err or result;
			end
			return host_module;
		end
		return nil, "global-module-already-loaded";
	end



	local _log = logger.init(host..":"..module_name);
	local api_instance = setmetatable({ name = module_name, host = host,
		_log = _log, log = function (self, ...) return _log(...); end, --luacheck: ignore 212/self
		event_handlers = new_multitable(), reloading = not not state,
		saved_state = state~=true and state or nil }
		, { __index = api });

	local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
	api_instance.environment = pluginenv;

	local mod, err = pluginloader.load_code(module_name, nil, pluginenv);
	if not mod then
		log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
		api_instance:set_status("error", "Failed to load (see log)");
		return nil, err;
	end

	api_instance.path = err;

	modulemap[host][module_name] = pluginenv;
	local ok, err = xpcall(mod, debug_traceback);
	if ok then
		-- Call module's "load"
		if module_has_method(pluginenv, "load") then
			ok, err = call_module_method(pluginenv, "load");
			if not ok then
				log("warn", "Error loading module '%s' on '%s': %s", module_name, host, err or "nil");
				api_instance:set_status("warn", "Error during load (see log)");
			end
		end
		api_instance.reloading, api_instance.saved_state = nil, nil;

		if api_instance.host == "*" then
			if not api_instance.global then -- COMPAT w/pre-0.9
				if host ~= "*" then
					log("warn", "mod_%s: Setting module.host = '*' deprecated, call module:set_global() instead", module_name);
				end
				api_instance:set_global();
			end
			modulemap[host][module_name] = nil;
			modulemap[api_instance.host][module_name] = pluginenv;
			if host ~= api_instance.host and module_has_method(pluginenv, "add_host") then
				-- Now load the module again onto the host it was originally being loaded on
				ok, err = do_load_module(host, module_name);
			end
		end
	end
	if not ok then
		modulemap[api_instance.host][module_name] = nil;
		log("error", "Error initializing module '%s' on '%s': %s", module_name, host, err or "nil");
		api_instance:set_status("warn", "Error during load (see log)");
	else
		api_instance:set_status("core", "Loaded", false);
	end
	return ok and pluginenv, err;
end

local function do_reload_module(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
		-- FIXME What goes in 'err' here?
		local ok, ret, err = call_module_method(mod, "save"); -- luacheck: ignore 211/err
		if ok then
			saved = ret;
		else
			log("warn", "Error saving module '%s:%s' state: %s", host, name, ret);
			if not config.get(host, "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

	mod.module.reloading = true;
	do_unload_module(host, name);
	local ok, err = do_load_module(host, name, saved or true);
	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
	end
	return ok and mod, err;
end

--- Public API ---

-- Load a module and fire module-loaded event
function load(host, name)
	local mod, err = do_load_module(host, name);
	if mod then
		(hosts[mod.module.host] or prosody).events.fire_event("module-loaded", { module = name, host = mod.module.host });
	end
	return mod, err;
end

-- Unload a module and fire module-unloaded
function unload(host, name)
	local ok, err = do_unload_module(host, name);
	if ok then
		(hosts[host] or prosody).events.fire_event("module-unloaded", { module = name, host = host });
	end
	return ok, err;
end

function reload(host, name)
	local mod, err = do_reload_module(host, name);
	if mod then
		modulemap[host][name].module.reloading = true;
		(hosts[host] or prosody).events.fire_event("module-reloaded", { module = name, host = host });
		mod.module.reloading = nil;
	elseif not is_loaded(host, name) then
		(hosts[host] or prosody).events.fire_event("module-unloaded", { module = name, host = host });
	end
	return mod, err;
end

function get_module(host, name)
	return modulemap[host] and modulemap[host][name];
end

function get_items(key, host)
	local result = {};
	local modules = modulemap[host];
	if not key or not host or not modules then return nil; end

	for _, module in pairs(modules) do
		local mod = module.module;
		if mod.items and mod.items[key] then
			for _, value in ipairs(mod.items[key]) do
				t_insert(result, value);
			end
		end
	end

	return result;
end

function get_modules(host)
	return modulemap[host];
end

function is_loaded(host, name)
	return modulemap[host] and modulemap[host][name] and true;
end

function module_has_method(module, method)
	return type(rawget(module.module, method)) == "function";
end

function call_module_method(module, method, ...)
	local f = rawget(module.module, method);
	if type(f) == "function" then
		return xpcall(f, debug_traceback, ...);
	else
		return false, "no-such-method";
	end
end

return {
	get_modules_for_host = get_modules_for_host;
	load_modules_for_host = load_modules_for_host;
	load = load;
	unload = unload;
	reload = reload;
	get_module = get_module;
	get_items = get_items;
	get_modules = get_modules;
	is_loaded = is_loaded;
	module_has_method = module_has_method;
	call_module_method = call_module_method;
};