aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_storage_memory.lua
blob: 3a9de1cc074b6c7f6d1d920e96d2b2580336d4d8 (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
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 auto_purge_enabled = module:get_option_boolean("storage_memory_temporary", false);
local auto_purge_stores = module:get_option_set("storage_memory_temporary_stores", {});

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;

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 = tostring(a):match"%x+$"..tostring(v):match"%x+$";
		v.key = key;
	end
	if a[key] then
		table.remove(a, a[key]);
	end
	local i = #a+1;
	a[i] = v;
	a[key] = i;
	return key;
end

local function archive_iter (a, start, stop, step, limit, when_start, when_end, match_with)
	local item, when, with;
	local count = 0;
	coroutine.yield(true); -- Ready
	for i = start, stop, step do
		item = a[i];
		when, with = item.when, item.with;
		if when >= when_start and when_end >= when and (not match_with or match_with == with) then
			coroutine.yield(item.key, item.value(), when, with);
			count = count + 1;
			if limit and count >= limit then return end
		end
	end
end

function archive_store:find(username, query)
	local a = self.store[username or NULL] or {};
	local start, stop, step = 1, #a, 1;
	local qstart, qend, qwith = -math.huge, math.huge;
	local limit;
	if query then
		module:log("debug", "query included")
		if query.reverse then
			start, stop, step = stop, start, -1;
			if query.before then
				start = a[query.before];
			end
		elseif query.after then
			start = a[query.after];
		end
		limit = query.limit;
		qstart = query.start or qstart;
		qend = query["end"] or qend;
		qwith = query.with;
	end
	if not start then return nil, "invalid-key"; end
	local iter = coroutine.wrap(archive_iter);
	iter(a, start, stop, step, limit, qstart, qend, qwith);
	return iter;
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);