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-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local format = string.format;
local setmetatable, type = setmetatable, type;
local pairs, ipairs = pairs, ipairs;
local char = string.char;
local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
local log = require "util.logger".init("datamanager");
local io_open = io.open;
local os_remove = os.remove;
local io_popen = io.popen;
local tostring, tonumber = tostring, tonumber;
local error = error;
local next = next;
local t_insert = table.insert;
local append = require "util.serialization".append;
local path_separator = "/"; if os.getenv("WINDIR") then path_separator = "\\" end
module "datamanager"
---- utils -----
local encode, decode;
do
local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
decode = function (s)
return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
end
encode = function (s)
return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
end
end
local _mkdir = {};
local function mkdir(path)
path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
if not _mkdir[path] then
local x = io_popen("mkdir \""..path.."\" 2>&1"):read("*a");
_mkdir[path] = true;
end
return path;
end
local data_path = "data";
local callbacks = {};
------- API -------------
function set_data_path(path)
log("debug", "Setting data path to: %s", path);
data_path = path;
end
local function callback(username, host, datastore, data)
for _, f in ipairs(callbacks) do
username, host, datastore, data = f(username, host, datastore, data);
if not username then break; end
end
return username, host, datastore, data;
end
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)
if callbacks[func] then
for i, f in ipairs(callbacks) do
if f == func then
callbacks[i] = nil;
callbacks[f] = nil;
return true;
end
end
end
end
function getpath(username, host, datastore, ext, create)
ext = ext or "dat";
host = host and encode(host);
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
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 data, ret = loadfile(getpath(username, host, datastore));
if not data then
log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
return nil;
end
setfenv(data, {});
local success, ret = pcall(data);
if not success then
log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
return nil;
end
return ret;
end
function store(username, host, datastore, data)
if not data then
data = {};
end
username, host, datastore, data = callback(username, host, datastore, data);
if not username then
return true; -- Don't save this data at all
end
-- save the datastore
local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
if not f then
log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
return;
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, host);
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
return true;
end
function list_append(username, host, datastore, data)
if not data then return; end
if callback and callback(username, host, datastore) then return true; end
-- save the datastore
local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
if not f then
log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
return;
end
f:write("item(");
append(f, data);
f:write(");\n");
f:close();
return true;
end
function list_store(username, host, datastore, data)
if not data then
data = {};
end
if callback and callback(username, host, datastore) then return true; end
-- save the datastore
local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
if not f then
log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(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, host);
os_remove(getpath(username, host, datastore, "list"));
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;
end
function list_load(username, host, datastore)
local data, ret = loadfile(getpath(username, host, datastore, "list"));
if not data then
log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
return nil;
end
local items = {};
setfenv(data, {item = function(i) t_insert(items, i); end});
local success, ret = pcall(data);
if not success then
log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
return nil;
end
return items;
end
return _M;
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