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, type = setmetatable, type;
12 local pairs, ipairs = pairs, 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 tostring, tonumber = tostring, tonumber;
22 local t_insert = table.insert;
23 local t_concat = table.concat;
24 local envloadfile = require"util.envload".envloadfile;
25 local serialize = require "util.serialization".serialize;
26 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)
27 local lfs = require "lfs";
28 local prosody = prosody;
32 if prosody.platform == "posix" then
33 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
34 fallocate = require "util.pposix".fallocate;
36 raw_mkdir = lfs.mkdir;
39 if not fallocate then -- Fallback
40 function fallocate(f, offset, len)
41 -- This assumes that current position == offset
42 local fake_data = (" "):rep(len);
43 local ok, msg = f:write(fake_data);
57 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
60 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
64 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
69 local function mkdir(path)
70 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
71 if not _mkdir[path] then
78 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
81 ------- API -------------
83 function set_data_path(path)
84 log("debug", "Setting data path to: %s", path);
88 local function callback(username, host, datastore, data)
89 for _, f in ipairs(callbacks) do
90 username, host, datastore, data = f(username, host, datastore, data);
91 if username == false then break; end
94 return username, host, datastore, data;
96 function add_callback(func)
97 if not callbacks[func] then -- Would you really want to set the same callback more than once?
98 callbacks[func] = true;
99 callbacks[#callbacks+1] = func;
103 function remove_callback(func)
104 if callbacks[func] then
105 for i, f in ipairs(callbacks) do
115 function getpath(username, host, datastore, ext, create)
117 host = (host and encode(host)) or "_global";
118 username = username and encode(username);
120 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
121 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
123 if create then mkdir(mkdir(data_path).."/"..host); end
124 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
126 if create then mkdir(data_path); end
127 return format("%s/%s.%s", data_path, datastore, ext);
131 function load(username, host, datastore)
132 local data, ret = envloadfile(getpath(username, host, datastore), {});
134 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
136 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
138 else -- file exists, but can't be read
139 -- TODO more detailed error checking and logging?
140 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
141 return nil, "Error reading storage";
145 local success, ret = pcall(data);
147 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
148 return nil, "Error reading storage";
153 local function atomic_store(filename, data)
154 local scratch = filename.."~";
157 f, msg = io_open(scratch, "w");
158 if not f then break end
160 ok, msg = f:write(data);
161 if not ok then break end
164 if not ok then break end
166 return os_rename(scratch, filename);
170 if f then f:close(); end
175 function store(username, host, datastore, data)
180 username, host, datastore, data = callback(username, host, datastore, data);
181 if username == false then
182 return true; -- Don't save this data at all
185 -- save the datastore
186 local d = "return " .. serialize(data) .. ";\n";
187 local ok, msg = atomic_store(getpath(username, host, datastore, nil, true), d);
189 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
190 return nil, "Error saving to storage";
192 if next(data) == nil then -- try to delete empty datastore
193 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
194 os_remove(getpath(username, host, datastore));
196 -- we write data even when we are deleting because lua doesn't have a
197 -- platform independent way of checking for non-exisitng files
201 function list_append(username, host, datastore, data)
202 if not data then return; end
203 if callback(username, host, datastore) == false then return true; end
204 -- save the datastore
205 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a");
207 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
210 local data = "item(" .. serialize(data) .. ");\n";
211 local pos = f:seek("end");
212 local ok, msg = fallocate(f, pos, #data);
217 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
224 function list_store(username, host, datastore, data)
228 if callback(username, host, datastore) == false then return true; end
229 -- save the datastore
231 for _, item in ipairs(data) do
232 d[#d+1] = "item(" .. serialize(item) .. ");\n";
234 local ok, msg = atomic_store(getpath(username, host, datastore, "list", true), t_concat(d));
236 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
239 if next(data) == nil then -- try to delete empty datastore
240 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
241 os_remove(getpath(username, host, datastore, "list"));
243 -- we write data even when we are deleting because lua doesn't have a
244 -- platform independent way of checking for non-exisitng files
248 function list_load(username, host, datastore)
250 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
252 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
254 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
256 else -- file exists, but can't be read
257 -- TODO more detailed error checking and logging?
258 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
259 return nil, "Error reading storage";
263 local success, ret = pcall(data);
265 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
266 return nil, "Error reading storage";
271 function list_stores(username, host)
273 return nil, "bad argument #2 to 'list_stores' (string expected, got nothing)";
276 local host_dir = format("%s/%s/", data_path, encode(host));
277 for node in lfs.dir(host_dir) do
278 if not node:match"^%." then -- dots should be encoded, this is probably . or ..
279 local store = decode(node);
280 local path = host_dir..node;
281 if username == true then
282 if lfs.attributes(path, "mode") == "directory" then
283 list[#list+1] = store;
286 if lfs.attributes(getpath(username, host, store), "mode")
287 or lfs.attributes(getpath(username, host, store, "list"), "mode") then
288 list[#list+1] = store;
290 elseif lfs.attributes(path, "mode") == "file" then
291 list[#list+1] = store:gsub("%.[dalist]+$","");
298 function purge(username, host)
299 local host_dir = format("%s/%s/", data_path, encode(host));
301 for file in lfs.dir(host_dir) do
302 if lfs.attributes(host_dir..file, "mode") == "directory" then
303 local store = decode(file);
304 deleted = deleted + (os_remove(getpath(username, host, store)) and 1 or 0);
305 deleted = deleted + (os_remove(getpath(username, host, store, "list")) and 1 or 0);
306 -- We this will generate loads of "No such file or directory", but do we care?
309 return deleted > 0, deleted;