aboutsummaryrefslogtreecommitdiffstats
path: root/core/modulemanager.lua
blob: b9f221c88c24a47b230ca6379e7c4658d6934997 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
-- 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 hosts = hosts;
local prosody = prosody;

local pcall, xpcall = pcall, xpcall;
local setmetatable, rawget, setfenv = setmetatable, rawget, setfenv;
local pairs, type, tostring = pairs, type, tostring;

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 set = require "util.set";

local autoload_modules = {"presence", "message", "iq", "offline", "c2s", "s2s"};
local component_inheritable_modules = {"tls", "dialback", "iq", "s2s"};

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

module "modulemanager"

local api = _G.require "core.moduleapi"; -- Module API container

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

-- 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 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 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);
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 handler, event in pairs(mod.module.event_handlers) do
		event.object.remove_handler(event.name, 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)
	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] = {};
		if host ~= "*" then
			hosts[host].modules = modulemap[host];
		end
	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
		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 = {}, items = {};
				_log = _log, log = function (self, ...) return _log(...); end;
			},{
				__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 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, path = err,
		_log = _log, log = function (self, ...) return _log(...); end, event_handlers = {} }
		, { __index = api });

	local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
	api_instance.environment = pluginenv;
	
	setfenv(mod, pluginenv);
	
	modulemap[host][module_name] = pluginenv;
	local ok, err = pcall(mod);
	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");
			end
		end

		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");
	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
		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, name, 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

	do_unload_module(host, name);
	local ok, err = do_load_module(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
	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_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 pcall(f, ...);
	else
		return false, "no-such-method";
	end
end

return _M;