2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
10 local format = string.format;
11 local setmetatable = setmetatable;
12 local ipairs = ipairs;
13 local char = string.char;
15 local log = require "util.logger".init("datamanager");
16 local io_open = io.open;
17 local os_remove = os.remove;
18 local os_rename = os.rename;
19 local tonumber = tonumber;
21 local t_insert = table.insert;
22 local t_concat = table.concat;
23 local envloadfile = require"util.envload".envloadfile;
24 local serialize = require "util.serialization".serialize;
25 local path_separator = assert ( package.config:match ( "^([^\n]+)" ) , "package.config not in standard form" ) -- Extract directory seperator from package.config (an undocumented string that comes with lua)
26 local lfs = require "lfs";
27 local prosody = prosody;
29 local raw_mkdir = lfs.mkdir;
30 local function fallocate(f, offset, len)
31 -- This assumes that current position == offset
32 local fake_data = (" "):rep(len);
33 local ok, msg = f:write(fake_data);
37 f:seek("set", offset);
41 local pposix = require "util.pposix";
42 raw_mkdir = pposix.mkdir or raw_mkdir; -- Doesn't trample on umask
43 fallocate = pposix.fallocate or fallocate;
51 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
54 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
58 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
63 local function mkdir(path)
64 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
65 if not _mkdir[path] then
72 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
75 ------- API -------------
77 local function set_data_path(path)
78 log("debug", "Setting data path to: %s", path);
82 local function callback(username, host, datastore, data)
83 for _, f in ipairs(callbacks) do
84 username, host, datastore, data = f(username, host, datastore, data);
85 if username == false then break; end
88 return username, host, datastore, data;
90 local function add_callback(func)
91 if not callbacks[func] then -- Would you really want to set the same callback more than once?
92 callbacks[func] = true;
93 callbacks[#callbacks+1] = func;
97 local function remove_callback(func)
98 if callbacks[func] then
99 for i, f in ipairs(callbacks) do
109 local function getpath(username, host, datastore, ext, create)
111 host = (host and encode(host)) or "_global";
112 username = username and encode(username);
114 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
115 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
117 if create then mkdir(mkdir(data_path).."/"..host); end
118 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
122 local function load(username, host, datastore)
123 local data, ret = envloadfile(getpath(username, host, datastore), {});
125 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
127 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
129 else -- file exists, but can't be read
130 -- TODO more detailed error checking and logging?
131 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
132 return nil, "Error reading storage";
136 local success, ret = pcall(data);
138 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
139 return nil, "Error reading storage";
144 local function atomic_store(filename, data)
145 local scratch = filename.."~";
148 f, msg = io_open(scratch, "w");
149 if not f then break end
151 ok, msg = f:write(data);
152 if not ok then break end
155 if not ok then break end
157 return os_rename(scratch, filename);
161 if f then f:close(); end
166 if prosody and prosody.platform ~= "posix" then
167 -- os.rename does not overwrite existing files on Windows
168 -- TODO We could use Transactional NTFS on Vista and above
169 function atomic_store(filename, data)
170 local f, err = io_open(filename, "w");
171 if not f then return f, err; end
172 local ok, msg = f:write(data);
173 if not ok then f:close(); return ok, msg; end
178 local function store(username, host, datastore, data)
183 username, host, datastore, data = callback(username, host, datastore, data);
184 if username == false then
185 return true; -- Don't save this data at all
188 -- save the datastore
189 local d = "return " .. serialize(data) .. ";\n";
190 local mkdir_cache_cleared;
192 local ok, msg = atomic_store(getpath(username, host, datastore, nil, true), d);
194 if not mkdir_cache_cleared then -- We may need to recreate a removed directory
196 mkdir_cache_cleared = true;
198 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
199 return nil, "Error saving to storage";
202 if next(data) == nil then -- try to delete empty datastore
203 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
204 os_remove(getpath(username, host, datastore));
206 -- we write data even when we are deleting because lua doesn't have a
207 -- platform independent way of checking for non-exisitng files
212 local function append(username, host, datastore, ext, data)
213 local filename = getpath(username, host, datastore, ext, true);
214 local f, msg = io_open(filename, "r+");
216 f, msg = io_open(filename, "w");
221 local pos = f:seek("end");
222 local ok, msg = fallocate(f, pos, #data);
238 local function list_append(username, host, datastore, data)
239 if not data then return; end
240 if callback(username, host, datastore) == false then return true; end
241 -- save the datastore
243 data = "item(" .. serialize(data) .. ");\n";
244 local ok, msg = append(username, host, datastore, "list", data);
246 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
252 local function list_store(username, host, datastore, data)
256 if callback(username, host, datastore) == false then return true; end
257 -- save the datastore
259 for _, item in ipairs(data) do
260 d[#d+1] = "item(" .. serialize(item) .. ");\n";
262 local ok, msg = atomic_store(getpath(username, host, datastore, "list", true), t_concat(d));
264 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
267 if next(data) == nil then -- try to delete empty datastore
268 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
269 os_remove(getpath(username, host, datastore, "list"));
271 -- we write data even when we are deleting because lua doesn't have a
272 -- platform independent way of checking for non-exisitng files
276 local function list_load(username, host, datastore)
278 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
280 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
282 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
284 else -- file exists, but can't be read
285 -- TODO more detailed error checking and logging?
286 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
287 return nil, "Error reading storage";
291 local success, ret = pcall(data);
293 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
294 return nil, "Error reading storage";
304 local function users(host, store, typ)
305 typ = type_map[typ or "keyval"];
306 local store_dir = format("%s/%s/%s", data_path, encode(host), store);
308 local mode, err = lfs.attributes(store_dir, "mode");
310 return function() log("debug", "%s", err or (store_dir .. " does not exist")) end
312 local next, state = lfs.dir(store_dir);
313 return function(state)
314 for node in next, state do
315 local file, ext = node:match("^(.*)%.([dalist]+)$");
316 if file and ext == typ then
323 local function stores(username, host, typ)
324 typ = type_map[typ or "keyval"];
325 local store_dir = format("%s/%s/", data_path, encode(host));
327 local mode, err = lfs.attributes(store_dir, "mode");
329 return function() log("debug", err or (store_dir .. " does not exist")) end
331 local next, state = lfs.dir(store_dir);
332 return function(state)
333 for node in next, state do
334 if not node:match"^%." then
335 if username == true then
336 if lfs.attributes(store_dir..node, "mode") == "directory" then
340 local store = decode(node)
341 if lfs.attributes(getpath(username, host, store, typ), "mode") then
344 elseif lfs.attributes(node, "mode") == "file" then
345 local file, ext = node:match("^(.*)%.([dalist]+)$");
355 local function do_remove(path)
356 local ok, err = os_remove(path);
357 if not ok and lfs.attributes(path, "mode") then
363 local function purge(username, host)
364 local host_dir = format("%s/%s/", data_path, encode(host));
365 local ok, iter, state, var = pcall(lfs.dir, host_dir);
370 for file in iter, state, var do
371 if lfs.attributes(host_dir..file, "mode") == "directory" then
372 local store = decode(file);
373 local ok, err = do_remove(getpath(username, host, store));
374 if not ok then errs[#errs+1] = err; end
376 local ok, err = do_remove(getpath(username, host, store, "list"));
377 if not ok then errs[#errs+1] = err; end
380 return #errs == 0, t_concat(errs, ", ");
384 set_data_path = set_data_path;
385 add_callback = add_callback;
386 remove_callback = remove_callback;
390 list_append = list_append;
391 list_store = list_store;
392 list_load = list_load;
396 path_decode = decode;
397 path_encode = encode;