aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_storage_memory.lua
blob: 9b0024abda4923bb37c5709e31fc8daa3391829e (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
local serialize = require "util.serialization".serialize;
local array = require "util.array";
local envload = require "util.envload".envload;
local st = require "util.stanza";
local is_stanza = st.is_stanza or function (s) return getmetatable(s) == st.stanza_mt end
local new_id = require "util.id".medium;
local set = require "util.set";

local auto_purge_enabled = module:get_option_boolean("storage_memory_temporary", false);
local auto_purge_stores = module:get_option_set("storage_memory_temporary_stores", {});

local archive_item_limit = module:get_option_number("storage_archive_item_limit", 1000);

local memory = setmetatable({}, {
	__index = function(t, k)
		local store = module:shared(k)
		t[k] = store;
		return store;
	end
});

local function NULL() return nil end

local function _purge_store(self, username)
	self.store[username or NULL] = nil;
	return true;
end

local function _users(self)
	return next, self.store, nil;
end

local keyval_store = {};
keyval_store.__index = keyval_store;

function keyval_store:get(username)
	return (self.store[username or NULL] or NULL)();
end

function keyval_store:set(username, data)
	if data ~= nil then
		data = envload("return "..serialize(data), "=(data)", {});
	end
	self.store[username or NULL] = data;
	return true;
end

keyval_store.purge = _purge_store;

keyval_store.users = _users;

local archive_store = {};
archive_store.__index = archive_store;

archive_store.users = _users;

archive_store.caps = {
	total = true;
	quota = archive_item_limit;
	truncate = true;
	full_id_range = true;
	ids = true;
};

function archive_store:append(username, key, value, when, with)
	if is_stanza(value) then
		value = st.preserialize(value);
		value = envload("return xml"..serialize(value), "=(stanza)", { xml = st.deserialize })
	else
		value = envload("return "..serialize(value), "=(data)", {});
	end
	local a = self.store[username or NULL];
	if not a then
		a = {};
		self.store[username or NULL] = a;
	end
	local v = { key = key, when = when, with = with, value = value };
	if not key then
		key = new_id();
		v.key = key;
	end
	if a[key] then
		table.remove(a, a[key]);
	elseif #a >= archive_item_limit then
		return nil, "quota-limit";
	end
	local i = #a+1;
	a[i] = v;
	a[key] = i;
	return key;
end

function archive_store:find(username, query)
	local items = self.store[username or NULL];
	if not items then
		if query then
			if query.before or query.after then
				return nil, "item-not-found";
			end
			if query.total then
				return function () end, 0;
			end
		end
		return function () end;
	end
	local count = nil;
	local i, last_key = 0;
	if query then
		items = array():append(items);
		if query.key then
			items:filter(function (item)
				return item.key == query.key;
			end);
		end
		if query.ids then
			local ids = set.new(query.ids);
			items:filter(function (item)
				return ids:contains(item.key);
			end);
		end
		if query.with then
			items:filter(function (item)
				return item.with == query.with;
			end);
		end
		if query.start then
			items:filter(function (item)
				return item.when >= query.start;
			end);
		end
		if query["end"] then
			items:filter(function (item)
				return item.when <= query["end"];
			end);
		end
		if query.total then
			count = #items;
		end
		if query.reverse then
			items:reverse();
			if query.before then
				local found = false;
				for j = 1, #items do
					if (items[j].key or tostring(j)) == query.before then
						found = true;
						i = j;
						break;
					end
				end
				if not found then
					return nil, "item-not-found";
				end
			end
			last_key = query.after;
		elseif query.after then
			local found = false;
			for j = 1, #items do
				if (items[j].key or tostring(j)) == query.after then
					found = true;
					i = j;
					break;
				end
			end
			if not found then
				return nil, "item-not-found";
			end
			last_key = query.before;
		elseif query.before then
			last_key = query.before;
		end
		if query.limit and #items - i > query.limit then
			items[i+query.limit+1] = nil;
		end
	end
	return function ()
		i = i + 1;
		local item = items[i];
		if not item or (last_key and item.key == last_key) then return; end
		return item.key, item.value(), item.when, item.with;
	end, count;
end

function archive_store:get(username, wanted_key)
	local items = self.store[username or NULL];
	if not items then return nil, "item-not-found"; end
	local i = items[wanted_key];
	if not i then return nil, "item-not-found"; end
	local item = items[i];
	return item.value(), item.when, item.with;
end

function archive_store:set(username, wanted_key, new_value, new_when, new_with)
	local items = self.store[username or NULL];
	if not items then return nil, "item-not-found"; end
	local i = items[wanted_key];
	if not i then return nil, "item-not-found"; end
	local item = items[i];

	if is_stanza(new_value) then
		new_value = st.preserialize(new_value);
		item.value = envload("return xml"..serialize(new_value), "=(stanza)", { xml = st.deserialize })
	else
		item.value = envload("return "..serialize(new_value), "=(data)", {});
	end
	if new_when then
		item.when = new_when;
	end
	if new_with then
		item.with = new_when;
	end
	return true;
end

function archive_store:summary(username, query)
	local iter, err = self:find(username, query)
	if not iter then return iter, err; end
	local counts = {};
	local earliest = {};
	local latest = {};
	for _, _, when, with in iter do
		counts[with] = (counts[with] or 0) + 1;
		if earliest[with] == nil then
			earliest[with] = when;
		end
		latest[with] = when;
	end
	return {
		counts = counts;
		earliest = earliest;
		latest = latest;
	};
end


function archive_store:delete(username, query)
	if not query or next(query) == nil then
		self.store[username or NULL] = nil;
		return true;
	end
	local items = self.store[username or NULL];
	if not items then
		-- Store is empty
		return 0;
	end
	items = array(items);
	local count_before = #items;
	if query then
		if query.key then
			items:filter(function (item)
				return item.key ~= query.key;
			end);
		end
		if query.with then
			items:filter(function (item)
				return item.with ~= query.with;
			end);
		end
		if query.start then
			items:filter(function (item)
				return item.when < query.start;
			end);
		end
		if query["end"] then
			items:filter(function (item)
				return item.when > query["end"];
			end);
		end
		if query.truncate and #items > query.truncate then
			if query.reverse then
				-- Before: { 1, 2, 3, 4, 5, }
				-- After: { 1, 2, 3 }
				for i = #items, query.truncate + 1, -1 do
					items[i] = nil;
				end
			else
				-- Before: { 1, 2, 3, 4, 5, }
				-- After: { 3, 4, 5 }
				local offset = #items - query.truncate;
				for i = 1, #items do
					items[i] = items[i+offset];
				end
			end
		end
	end
	local count = count_before - #items;
	if count == 0 then
		return 0; -- No changes, skip write
	end
	setmetatable(items, nil);

	do -- re-index by key
		for k in pairs(items) do
			if type(k) == "string" then
				items[k] = nil;
			end
		end

		for i = 1, #items do
			items[ items[i].key ] = i;
		end
	end

	return count;
end

archive_store.purge = _purge_store;

local stores = {
	keyval = keyval_store;
	archive = archive_store;
}

local driver = {};

function driver:open(store, typ) -- luacheck: ignore 212/self
	local store_mt = stores[typ or "keyval"];
	if store_mt then
		return setmetatable({ store = memory[store] }, store_mt);
	end
	return nil, "unsupported-store";
end

function driver:purge(user) -- luacheck: ignore 212/self
	for _, store in pairs(memory) do
		store[user] = nil;
	end
end

if auto_purge_enabled then
	module:hook("resource-unbind", function (event)
		local user_bare_jid = event.session.username.."@"..event.session.host;
		if not prosody.bare_sessions[user_bare_jid] then -- User went offline
			module:log("debug", "Clearing store for offline user %s", user_bare_jid);
			local f, s, v;
			if auto_purge_stores:empty() then
				f, s, v = pairs(memory);
			else
				f, s, v = auto_purge_stores:items();
			end

			for store_name in f, s, v do
				if memory[store_name] then
					memory[store_name][event.session.username] = nil;
				end
			end
		end
	end);
end

module:provides("storage", driver);