aboutsummaryrefslogtreecommitdiffstats
path: root/core/storagemanager.lua
blob: 64ae13e3c558d7e59a7a118e1ce1904d4e58f7fe (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

local type, pairs = type, pairs;
local setmetatable = setmetatable;

local config = require "core.configmanager";
local datamanager = require "util.datamanager";
local modulemanager = require "core.modulemanager";
local multitable = require "util.multitable";
local hosts = hosts;
local log = require "util.logger".init("storagemanager");

local prosody = prosody;

local _ENV = nil;

local olddm = {}; -- maintain old datamanager, for backwards compatibility
for k,v in pairs(datamanager) do olddm[k] = v; end

local null_storage_method = function () return false, "no data storage active"; end
local null_storage_driver = setmetatable(
	{
		name = "null",
		open = function (self) return self; end
	}, {
		__index = function (self, method) --luacheck: ignore 212
			return null_storage_method;
		end
	}
);

local stores_available = multitable.new();

local function initialize_host(host)
	local host_session = hosts[host];
	host_session.events.add_handler("item-added/storage-provider", function (event)
		local item = event.item;
		stores_available:set(host, item.name, item);
	end);

	host_session.events.add_handler("item-removed/storage-provider", function (event)
		local item = event.item;
		stores_available:set(host, item.name, nil);
	end);
end
prosody.events.add_handler("host-activated", initialize_host, 101);

local function load_driver(host, driver_name)
	if driver_name == "null" then
		return null_storage_driver;
	end
	local driver = stores_available:get(host, driver_name);
	if driver then return driver; end
	local ok, err = modulemanager.load(host, "storage_"..driver_name);
	if not ok then
		log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
	end
	return stores_available:get(host, driver_name);
end

local function get_storage_config(host)
	-- COMPAT w/ unreleased Prosody 0.10 and the once-experimental mod_storage_sql2 in peoples' config files
	local storage_config = config.get(host, "storage");
	local found_sql2;
	if storage_config == "sql2" then
		storage_config, found_sql2 = "sql", true;
	elseif type(storage_config) == "table" then
		for store_name, driver_name in pairs(storage_config) do
			if driver_name == "sql2" then
				storage_config[store_name] = "sql";
				found_sql2 = true;
			end
		end
	end
	if found_sql2 then
		log("error", "The temporary 'sql2' storage module has now been renamed to 'sql', please update your config file: https://prosody.im/doc/modules/mod_storage_sql2");
	end
	return storage_config;
end

local function get_driver(host, store)
	local storage = get_storage_config(host);
	local driver_name;
	local option_type = type(storage);
	if option_type == "string" then
		driver_name = storage;
	elseif option_type == "table" then
		driver_name = storage[store];
	end
	if not driver_name then
		driver_name = config.get(host, "default_storage") or "internal";
	end

	local driver = load_driver(host, driver_name);
	if not driver then
		log("warn", "Falling back to null driver for %s storage on %s", store, host);
		driver_name = "null";
		driver = null_storage_driver;
	end
	return driver, driver_name;
end

local map_shim_mt = {
	__index = {
		get = function(self, username, key)
			local ret, err = self.keyval_store:get(username);
			if ret == nil then return nil, err end
			return ret[key];
		end;
		set = function(self, username, key, data)
			local current, err = self.keyval_store:get(username);
			if current == nil then
				if err then
					return nil, err;
				else
					current = {};
				end
			end
			current[key] = data;
			return self.keyval_store:set(username, current);
		end;
		set_keys = function (self, username, keydatas)
			local current, err = self.keyval_store:get(username);
			if current == nil then
				if err then
					return nil, err;
				end
				current = {};
			end
			for k,v in pairs(keydatas) do
				if v == self.remove then v = nil; end
				current[k] = v;
			end
			return self.keyval_store:set(username, current);
		end;
		remove = {};
	};
}

local open;

local function create_map_shim(host, store)
	local keyval_store, err = open(host, store, "keyval");
	if keyval_store == nil then return nil, err end
	return setmetatable({
		keyval_store = keyval_store;
	}, map_shim_mt);
end

function open(host, store, typ)
	local driver, driver_name = get_driver(host, store);
	local ret, err = driver:open(store, typ);
	if not ret then
		if err == "unsupported-store" then
			if typ == "map" then -- Use shim on top of keyval store
				log("debug", "map storage driver unavailable, using shim on top of keyval store.");
				ret, err = create_map_shim(host, store);
			else
				log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
					driver_name, store, typ or "<nil>");
				ret, err = null_storage_driver, nil;
			end
		end
	end
	return ret, err;
end

local function purge(user, host)
	local storage = get_storage_config(host);
	if type(storage) == "table" then
		-- multiple storage backends in use that we need to purge
		local purged = {};
		for store, driver_name in pairs(storage) do
			if not purged[driver_name] then
				local driver = get_driver(host, store);
				if driver.purge then
					purged[driver_name] = driver:purge(user);
				else
					log("warn", "Storage driver %s does not support removing all user data, you may need to delete it manually", driver_name);
				end
			end
		end
	end
	get_driver(host):purge(user); -- and the default driver

	olddm.purge(user, host); -- COMPAT list stores, like offline messages end up in the old datamanager

	return true;
end

function datamanager.load(username, host, datastore)
	return open(host, datastore):get(username);
end
function datamanager.store(username, host, datastore, data)
	return open(host, datastore):set(username, data);
end
function datamanager.users(host, datastore, typ)
	local driver = open(host, datastore, typ);
	if not driver.users then
		return function() log("warn", "Storage driver %s does not support listing users", driver.name) end
	end
	return driver:users();
end
function datamanager.stores(username, host, typ)
	return get_driver(host):stores(username, typ);
end
function datamanager.purge(username, host)
	return purge(username, host);
end

return {
	initialize_host = initialize_host;
	load_driver = load_driver;
	get_driver = get_driver;
	open = open;
	purge = purge;

	olddm = olddm;
};