local format = string.format;
-local setmetatable, type = setmetatable, type;
-local pairs, ipairs = pairs, ipairs;
+local setmetatable = setmetatable;
+local ipairs = ipairs;
local char = string.char;
local pcall = pcall;
local log = require "util.logger".init("datamanager");
local io_open = io.open;
local os_remove = os.remove;
-local tostring, tonumber = tostring, tonumber;
-local error = error;
+local os_rename = os.rename;
+local tonumber = tonumber;
+local tostring = tostring;
local next = next;
+local type = type;
local t_insert = table.insert;
-local append = require "util.serialization".append;
+local t_concat = table.concat;
local envloadfile = require"util.envload".envloadfile;
+local serialize = require "util.serialization".serialize;
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)
local lfs = require "lfs";
local prosody = prosody;
-local raw_mkdir;
-if prosody.platform == "posix" then
- raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
-else
- raw_mkdir = lfs.mkdir;
-end
+local raw_mkdir = lfs.mkdir;
+local function fallocate(f, offset, len)
+ -- This assumes that current position == offset
+ local fake_data = (" "):rep(len);
+ local ok, msg = f:write(fake_data);
+ if not ok then
+ return ok, msg;
+ end
+ f:seek("set", offset);
+ return true;
+end;
+pcall(function()
+ local pposix = require "util.pposix";
+ raw_mkdir = pposix.mkdir or raw_mkdir; -- Doesn't trample on umask
+ fallocate = pposix.fallocate or fallocate;
+end);
-module "datamanager"
+local _ENV = nil;
---- utils -----
local encode, decode;
------- API -------------
-function set_data_path(path)
+local function set_data_path(path)
log("debug", "Setting data path to: %s", path);
data_path = path;
end
return username, host, datastore, data;
end
-function add_callback(func)
+local function add_callback(func)
if not callbacks[func] then -- Would you really want to set the same callback more than once?
callbacks[func] = true;
callbacks[#callbacks+1] = func;
return true;
end
end
-function remove_callback(func)
+local function remove_callback(func)
if callbacks[func] then
for i, f in ipairs(callbacks) do
if f == func then
end
end
-function getpath(username, host, datastore, ext, create)
+local function getpath(username, host, datastore, ext, create)
ext = ext or "dat";
host = (host and encode(host)) or "_global";
username = username and encode(username);
if username then
if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
- elseif host then
+ else
if create then mkdir(mkdir(data_path).."/"..host); end
return format("%s/%s/%s.%s", data_path, host, datastore, ext);
- else
- if create then mkdir(data_path); end
- return format("%s/%s.%s", data_path, datastore, ext);
end
end
-function load(username, host, datastore)
+local function load(username, host, datastore)
local data, ret = envloadfile(getpath(username, host, datastore), {});
if not data then
local mode = lfs.attributes(getpath(username, host, datastore), "mode");
return ret;
end
-function store(username, host, datastore, data)
+local function atomic_store(filename, data)
+ local scratch = filename.."~";
+ local f, ok, msg;
+
+ f, msg = io_open(scratch, "w");
+ if not f then
+ return nil, msg;
+ end
+
+ ok, msg = f:write(data);
+ if not ok then
+ f:close();
+ os_remove(scratch);
+ return nil, msg;
+ end
+
+ ok, msg = f:close();
+ if not ok then
+ os_remove(scratch);
+ return nil, msg;
+ end
+
+ return os_rename(scratch, filename);
+end
+
+if prosody and prosody.platform ~= "posix" then
+ -- os.rename does not overwrite existing files on Windows
+ -- TODO We could use Transactional NTFS on Vista and above
+ function atomic_store(filename, data)
+ local f, err = io_open(filename, "w");
+ if not f then return f, err; end
+ local ok, msg = f:write(data);
+ if not ok then f:close(); return ok, msg; end
+ return f:close();
+ end
+end
+
+local function store(username, host, datastore, data)
if not data then
data = {};
end
end
-- save the datastore
- local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
+ local d = "return " .. serialize(data) .. ";\n";
+ local mkdir_cache_cleared;
+ repeat
+ local ok, msg = atomic_store(getpath(username, host, datastore, nil, true), d);
+ if not ok then
+ if not mkdir_cache_cleared then -- We may need to recreate a removed directory
+ _mkdir = {};
+ mkdir_cache_cleared = true;
+ else
+ log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
+ return nil, "Error saving to storage";
+ end
+ end
+ if next(data) == nil then -- try to delete empty datastore
+ log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
+ os_remove(getpath(username, host, datastore));
+ end
+ -- we write data even when we are deleting because lua doesn't have a
+ -- platform independent way of checking for non-exisitng files
+ until ok;
+ return true;
+end
+
+-- Append a blob of data to a file
+local function append(username, host, datastore, ext, data)
+ if type(data) ~= "string" then return; end
+ local filename = getpath(username, host, datastore, ext, true);
+
+ local ok;
+ local f, msg = io_open(filename, "r+");
if not f then
- log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
- return nil, "Error saving to storage";
+ -- File did probably not exist, let's create it
+ f, msg = io_open(filename, "w");
+ if not f then
+ return nil, msg, "open";
+ end
end
- f:write("return ");
- append(f, data);
- f:close();
- if next(data) == nil then -- try to delete empty datastore
- log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
- os_remove(getpath(username, host, datastore));
+
+ local pos = f:seek("end");
+ ok, msg = fallocate(f, pos, #data);
+ if not ok then
+ log("warn", "fallocate() failed: %s", tostring(msg));
+ -- This doesn't work on every file system
end
- -- we write data even when we are deleting because lua doesn't have a
- -- platform independent way of checking for non-exisitng files
- return true;
+
+ if f:seek() ~= pos then
+ log("debug", "fallocate() changed file position");
+ f:seek("set", pos);
+ end
+
+ ok, msg = f:write(data);
+ if not ok then
+ f:close();
+ return ok, msg, "write";
+ end
+
+ ok, msg = f:close();
+ if not ok then
+ return ok, msg;
+ end
+
+ return true, pos;
end
-function list_append(username, host, datastore, data)
+local function list_append(username, host, datastore, data)
if not data then return; end
if callback(username, host, datastore) == false then return true; end
-- save the datastore
- local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
- if not f then
+
+ data = "item(" .. serialize(data) .. ");\n";
+ local ok, msg = append(username, host, datastore, "list", data);
+ if not ok then
log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
- return;
+ return ok, msg;
end
- f:write("item(");
- append(f, data);
- f:write(");\n");
- f:close();
return true;
end
-function list_store(username, host, datastore, data)
+local function list_store(username, host, datastore, data)
if not data then
data = {};
end
if callback(username, host, datastore) == false then return true; end
-- save the datastore
- local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
- if not f then
+ local d = {};
+ for _, item in ipairs(data) do
+ d[#d+1] = "item(" .. serialize(item) .. ");\n";
+ end
+ local ok, msg = atomic_store(getpath(username, host, datastore, "list", true), t_concat(d));
+ if not ok then
log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
return;
end
- for _, d in ipairs(data) do
- f:write("item(");
- append(f, d);
- f:write(");\n");
- end
- f:close();
if next(data) == nil then -- try to delete empty datastore
log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
os_remove(getpath(username, host, datastore, "list"));
return true;
end
-function list_load(username, host, datastore)
+local function list_load(username, host, datastore)
local items = {};
local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
if not data then
return items;
end
-function list_stores(username, host)
- if not host then
- return nil, "bad argument #2 to 'list_stores' (string expected, got nothing)";
+local type_map = {
+ keyval = "dat";
+ list = "list";
+}
+
+local function users(host, store, typ)
+ typ = type_map[typ or "keyval"];
+ local store_dir = format("%s/%s/%s", data_path, encode(host), store);
+
+ local mode, err = lfs.attributes(store_dir, "mode");
+ if not mode then
+ return function() log("debug", "%s", err or (store_dir .. " does not exist")) end
end
- local list = {};
- local host_dir = format("%s/%s/", data_path, encode(host));
- for node in lfs.dir(host_dir) do
- if not node:match"^%." then -- dots should be encoded, this is probably . or ..
- local store = decode(node);
- local path = host_dir..node;
- if username == true then
- if lfs.attributes(path, "mode") == "directory" then
- list[#list+1] = store;
- end
- elseif username then
- if lfs.attributes(getpath(username, host, store), "mode")
- or lfs.attributes(getpath(username, host, store, "list"), "mode") then
- list[#list+1] = store;
+ local next, state = lfs.dir(store_dir);
+ return function(state)
+ for node in next, state do
+ local file, ext = node:match("^(.*)%.([dalist]+)$");
+ if file and ext == typ then
+ return decode(file);
+ end
+ end
+ end, state;
+end
+
+local function stores(username, host, typ)
+ typ = type_map[typ or "keyval"];
+ local store_dir = format("%s/%s/", data_path, encode(host));
+
+ local mode, err = lfs.attributes(store_dir, "mode");
+ if not mode then
+ return function() log("debug", err or (store_dir .. " does not exist")) end
+ end
+ local next, state = lfs.dir(store_dir);
+ return function(state)
+ for node in next, state do
+ if not node:match"^%." then
+ if username == true then
+ if lfs.attributes(store_dir..node, "mode") == "directory" then
+ return decode(node);
+ end
+ elseif username then
+ local store = decode(node)
+ if lfs.attributes(getpath(username, host, store, typ), "mode") then
+ return store;
+ end
+ elseif lfs.attributes(node, "mode") == "file" then
+ local file, ext = node:match("^(.*)%.([dalist]+)$");
+ if ext == typ then
+ return decode(file)
+ end
end
- elseif lfs.attributes(path, "mode") == "file" then
- list[#list+1] = store:gsub("%.[dalist]+$","");
end
end
+ end, state;
+end
+
+local function do_remove(path)
+ local ok, err = os_remove(path);
+ if not ok and lfs.attributes(path, "mode") then
+ return ok, err;
end
- return list;
+ return true
end
-function purge(username, host)
+local function purge(username, host)
local host_dir = format("%s/%s/", data_path, encode(host));
- local deleted = 0;
- for file in lfs.dir(host_dir) do
+ local ok, iter, state, var = pcall(lfs.dir, host_dir);
+ if not ok then
+ return ok, iter;
+ end
+ local errs = {};
+ for file in iter, state, var do
if lfs.attributes(host_dir..file, "mode") == "directory" then
local store = decode(file);
- deleted = deleted + (os_remove(getpath(username, host, store)) and 1 or 0);
- deleted = deleted + (os_remove(getpath(username, host, store, "list")) and 1 or 0);
- -- We this will generate loads of "No such file or directory", but do we care?
+ local ok, err = do_remove(getpath(username, host, store));
+ if not ok then errs[#errs+1] = err; end
+
+ local ok, err = do_remove(getpath(username, host, store, "list"));
+ if not ok then errs[#errs+1] = err; end
end
end
- return deleted > 0, deleted;
+ return #errs == 0, t_concat(errs, ", ");
end
-return _M;
+return {
+ set_data_path = set_data_path;
+ add_callback = add_callback;
+ remove_callback = remove_callback;
+ getpath = getpath;
+ load = load;
+ store = store;
+ append_raw = append;
+ list_append = list_append;
+ list_store = list_store;
+ list_load = list_load;
+ users = users;
+ stores = stores;
+ purge = purge;
+ path_decode = decode;
+ path_encode = encode;
+};
projects / prosody.git / blobdiff