aboutsummaryrefslogtreecommitdiffstats
path: root/core/moduleapi.lua
blob: 524103527f5ada08aaa4a0cc93055340a61957d1 (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
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
-- Prosody IM
-- Copyright (C) 2008-2012 Matthew Wild
-- Copyright (C) 2008-2012 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local array = require "util.array";
local set = require "util.set";
local it = require "util.iterators";
local logger = require "util.logger";
local pluginloader = require "util.pluginloader";
local timer = require "util.timer";
local resolve_relative_path = require"util.paths".resolve_relative_path;
local st = require "util.stanza";
local cache = require "util.cache";
local errors = require "util.error";
local promise = require "util.promise";
local time_now = require "util.time".now;
local format = require "util.format".format;
local jid_node = require "util.jid".node;
local jid_resource = require "util.jid".resource;

local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
local error, setmetatable, type = error, setmetatable, type;
local ipairs, pairs, select = ipairs, pairs, select;
local tonumber, tostring = tonumber, tostring;
local require = require;
local pack = table.pack or require "util.table".pack; -- table.pack is only in 5.2
local unpack = table.unpack or unpack; --luacheck: ignore 113 -- renamed in 5.2

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

-- FIXME: This assert() is to try and catch an obscure bug (2013-04-05)
local core_post_stanza = assert(prosody.core_post_stanza,
	"prosody.core_post_stanza is nil, please report this as a bug");

-- Registry of shared module data
local shared_data = setmetatable({}, { __mode = "v" });

local NULL = {};

local 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 (self.host == "*" and "global") or hosts[self.host].type or "local";
end

function api:set_global()
	self.host = "*";
	-- Update the logger
	local _log = logger.init("mod_"..self.name);
	self.log = function (self, ...) return _log(...); end; --luacheck: ignore self
	self._log = _log;
	self.global = true;
end

function api:add_feature(xmlns)
	self:add_item("feature", xmlns);
end
function api:add_identity(category, identity_type, name)
	self:add_item("identity", {category = category, type = identity_type, name = name});
end
function api:add_extension(data)
	self:add_item("extension", data);
end

function api:fire_event(...)
	return (hosts[self.host] or prosody).events.fire_event(...);
end

function api:hook_object_event(object, event, handler, priority)
	self.event_handlers:set(object, event, handler, true);
	return object.add_handler(event, handler, priority);
end

function api:unhook_object_event(object, event, handler)
	self.event_handlers:set(object, event, handler, nil);
	return object.remove_handler(event, handler);
end

function api:hook(event, handler, priority)
	return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
end

function api:hook_global(event, handler, priority)
	return self:hook_object_event(prosody.events, event, handler, priority);
end

function api:hook_tag(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 self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name,
		function (data) return handler(data.origin, data.stanza, data); end, priority);
end
api.hook_stanza = api.hook_tag; -- COMPAT w/pre-0.9

function api:unhook(event, handler)
	return self:unhook_object_event((hosts[self.host] or prosody).events, event, handler);
end

function api:wrap_object_event(events_object, event, handler)
	return self:hook_object_event(assert(events_object.wrappers, "no wrappers"), event, handler);
end

function api:wrap_event(event, handler)
	return self:wrap_object_event((hosts[self.host] or prosody).events, event, handler);
end

function api:wrap_global(event, handler)
	return self:hook_object_event(prosody.events, event, handler);
end

function api:require(lib)
	local f, n = pluginloader.load_code_ext(self.name, lib, "lib.lua", self.environment);
	if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
	return f();
end

function api:depends(name)
	local modulemanager = require"core.modulemanager";
	if self:get_option_inherited_set("modules_disabled", {}):contains(name) then
		error("Dependency on disabled module mod_"..name);
	end
	if not self.dependencies then
		self.dependencies = {};
		self:hook("module-reloaded", function (event)
			if self.dependencies[event.module] and not self.reloading then
				self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
				modulemanager.reload(self.host, self.name);
				return;
			end
		end);
		self:hook("module-unloaded", function (event)
			if self.dependencies[event.module] then
				self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
				modulemanager.unload(self.host, self.name);
			end
		end);
	end
	local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
	if mod and mod.module.host == "*" and self.host ~= "*"
	and modulemanager.module_has_method(mod, "add_host") then
		mod = nil; -- Target is a shared module, so we still want to load it on our host
	end
	if not mod then
		local err;
		mod, err = modulemanager.load(self.host, name);
		if not mod then
			return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
		end
	end
	self.dependencies[name] = true;
	return mod;
end

local function get_shared_table_from_path(module, tables, path)
	if path:sub(1,1) ~= "/" then -- Prepend default components
		local default_path_components = { module.host, module.name };
		local n_components = select(2, path:gsub("/", "%1"));
		path = (n_components<#default_path_components and "/" or "")
			..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
	end
	local shared = tables[path];
	if not shared then
		shared = {};
		if path:match("%-cache$") then
			setmetatable(shared, { __mode = "kv" });
		end
		tables[path] = shared;
	end
	return shared;
end

-- Returns a shared table at the specified virtual path
-- Intentionally does not allow the table to be _set_, it
-- is auto-created if it does not exist.
function api:shared(path)
	if not self.shared_data then self.shared_data = {}; end
	local shared = get_shared_table_from_path(self, shared_data, path);
	self.shared_data[path] = shared;
	return shared;
end

function api:get_option(name, default_value)
	local config = require "core.configmanager";
	local value = config.get(self.host, name);
	if value == nil then
		value = default_value;
	end
	return value;
end

function api:get_option_scalar(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
	return value;
end

function api:get_option_string(name, default_value)
	local value = self:get_option_scalar(name, default_value);
	if value == nil then
		return nil;
	end
	return tostring(value);
end

function api:get_option_number(name, ...)
	local value = self:get_option_scalar(name, ...);
	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_scalar(name, ...);
	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

function api:get_option_inherited_set(name, ...)
	local value = self:get_option_set(name, ...);
	local global_value = self:context("*"):get_option_set(name, ...);
	if not value then
		return global_value;
	elseif not global_value then
		return value;
	end
	value:include(global_value);
	return value;
end

function api:get_option_path(name, default, parent)
	if parent == nil then
		parent = self:get_directory();
	elseif prosody.paths[parent] then
		parent = prosody.paths[parent];
	end
	local value = self:get_option_string(name, default);
	if value == nil then
		return nil;
	end
	return resolve_relative_path(parent, value);
end


function api:context(host)
	return setmetatable({host=host or "*"}, {__index=self,__newindex=self});
end

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 modulemanager = require"core.modulemanager";
	local result = modulemanager.get_items(key, self.host) or {};
	return result;
end

function api:handle_items(item_type, added_cb, removed_cb, existing)
	self:hook("item-added/"..item_type, added_cb);
	self:hook("item-removed/"..item_type, removed_cb);
	if existing ~= false then
		for _, item in ipairs(self:get_host_items(item_type)) do
			added_cb({ item = item });
		end
	end
end

function api:provides(name, item)
	-- if not item then item = setmetatable({}, { __index = function(t,k) return rawget(self.environment, k); end }); end
	if not item then
		item = {}
		for k,v in pairs(self.environment) do
			if k ~= "module" then item[k] = v; end
		end
	end
	if not item.name then
		local item_name = self.name;
		-- Strip a provider prefix to find the item name
		-- (e.g. "auth_foo" -> "foo" for an auth provider)
		if item_name:find(name.."_", 1, true) == 1 then
			item_name = item_name:sub(#name+2);
		end
		item.name = item_name;
	end
	item._provided_by = self.name;
	self:add_item(name.."-provider", item);
end

function api:send(stanza, origin)
	return core_post_stanza(origin or hosts[self.host], stanza);
end

function api:send_iq(stanza, origin, timeout)
	local iq_cache = self._iq_cache;
	if not iq_cache then
		iq_cache = cache.new(256, function (_, iq)
			iq.reject(errors.new({
				type = "wait", condition = "resource-constraint",
				text = "evicted from iq tracking cache"
			}));
		end);
		self._iq_cache = iq_cache;
	end

	local event_type;
	if not jid_node(stanza.attr.from) then
		event_type = "host";
	elseif jid_resource(stanza.attr.from) then
		event_type = "full";
	else -- assume bare since we can't hook full jids
		event_type = "bare";
	end
	local result_event = "iq-result/"..event_type.."/"..stanza.attr.id;
	local error_event = "iq-error/"..event_type.."/"..stanza.attr.id;
	local cache_key = event_type.."/"..stanza.attr.id;
	if event_type == "full" then
		result_event = "iq/" .. event_type;
		error_event = "iq/" .. event_type;
	end

	local p = promise.new(function (resolve, reject)
		local function result_handler(event)
			local response = event.stanza;
			if response.attr.type == "result" and response.attr.from == stanza.attr.to and response.attr.id == stanza.attr.id then
				resolve(event);
				return true;
			end
		end

		local function error_handler(event)
			local response = event.stanza;
			if response.attr.type == "error" and response.attr.from == stanza.attr.to and response.attr.id == stanza.attr.id then
				reject(errors.from_stanza(event.stanza, event));
				return true;
			end
		end

		if iq_cache:get(cache_key) then
			reject(errors.new({
				type = "modify", condition = "conflict",
				text = "IQ stanza id attribute already used",
			}));
			return;
		end

		self:hook(result_event, result_handler);
		self:hook(error_event, error_handler);

		local timeout_handle = self:add_timer(timeout or 120, function ()
			reject(errors.new({
				type = "wait", condition = "remote-server-timeout",
				text = "IQ stanza timed out",
			}));
		end);

		local ok = iq_cache:set(cache_key, {
			reject = reject, resolve = resolve,
			timeout_handle = timeout_handle,
			result_handler = result_handler, error_handler = error_handler;
		});

		if not ok then
			reject(errors.new({
				type = "wait", condition = "internal-server-error",
				text = "Could not store IQ tracking data"
			}));
			return;
		end

		local wrapped_origin = setmetatable({
				-- XXX Needed in some cases for replies to work correctly when sending queries internally.
				send = function (reply)
					if reply.name == stanza.name and reply.attr.id == stanza.attr.id then
						resolve({ stanza = reply });
					end
					return (origin or hosts[self.host]).send(reply)
				end;
			}, {
				__index = origin or hosts[self.host];
			});

		self:send(stanza, wrapped_origin);
	end);

	p:finally(function ()
		local iq = iq_cache:get(cache_key);
		if iq then
			self:unhook(result_event, iq.result_handler);
			self:unhook(error_event, iq.error_handler);
			iq.timeout_handle:stop();
			iq_cache:set(cache_key, nil);
		end
	end);

	return p;
end

function api:broadcast(jids, stanza, iter)
	for jid in (iter or it.values)(jids) do
		local new_stanza = st.clone(stanza);
		new_stanza.attr.to = jid;
		self:send(new_stanza);
	end
end

local timer_methods = { }
local timer_mt = {
	__index = timer_methods;
}
function timer_methods:stop( )
	timer.stop(self.id);
end
timer_methods.disarm = timer_methods.stop
function timer_methods:reschedule(delay)
	timer.reschedule(self.id, delay)
end

local function timer_callback(now, id, t) --luacheck: ignore 212/id
	if t.module_env.loaded == false then return; end
	return t.callback(now, unpack(t, 1, t.n));
end

function api:add_timer(delay, callback, ...)
	local t = pack(...)
	t.module_env = self;
	t.callback = callback;
	t.id = timer.add_task(delay, timer_callback, t);
	return setmetatable(t, timer_mt);
end

local path_sep = package.config:sub(1,1);
function api:get_directory()
	return self.resource_path or self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
end

function api:load_resource(path, mode)
	path = resolve_relative_path(self:get_directory(), path);
	return io.open(path, mode);
end

function api:open_store(name, store_type)
	return require"core.storagemanager".open(self.host, name or self.name, store_type);
end

function api:measure(name, stat_type, conf)
	local measure = require "core.statsmanager".measure;
	local fixed_label_key, fixed_label_value
	if self.host ~= "*" then
		fixed_label_key = "host"
		fixed_label_value = self.host
	end
	-- new_legacy_metric takes care of scoping for us, as it does not accept
	-- an array of labels
	-- the prosody_ prefix is automatically added by statsmanager for legacy
	-- metrics.
	return measure(stat_type, "mod_"..self.name.."/"..name, conf, fixed_label_key, fixed_label_value)
end

function api:metric(type_, name, unit, description, label_keys, conf)
	local metric = require "core.statsmanager".metric;
	local is_scoped = self.host ~= "*"
	if is_scoped then
		-- prepend `host` label to label keys if this is not a global module
		local orig_labels = label_keys
		label_keys = array { "host" }
		label_keys:append(orig_labels)
	end
	local mf = metric(type_, "prosody_mod_"..self.name.."/"..name, unit, description, label_keys, conf)
	if is_scoped then
		-- make sure to scope the returned metric family to the current host
		return mf:with_partial_label(self.host)
	end
	return mf
end

local status_priorities = { error = 3, warn = 2, info = 1, core = 0 };

function api:set_status(status_type, status_message, override)
	local priority = status_priorities[status_type];
	if not priority then
		self:log("error", "set_status: Invalid status type '%s', assuming 'info'");
		status_type, priority = "info", status_priorities.info;
	end
	local current_priority = status_priorities[self.status_type] or 0;
	-- By default an 'error' status can only be overwritten by another 'error' status
	if (current_priority >= status_priorities.error and priority < current_priority and override ~= true)
	or (override == false and current_priority > priority) then
		self:log("debug", "moduleapi: ignoring status [prio %d override %s]: %s", priority, override, status_message);
		return;
	end
	self.status_type, self.status_message, self.status_time = status_type, status_message, time_now();
	self:fire_event("module-status/updated", { name = self.name });
end

function api:log_status(level, msg, ...)
	self:set_status(level, format(msg, ...));
	return self:log(level, msg, ...);
end

function api:get_status()
	return self.status_type, self.status_message, self.status_time;
end

return api;