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229 lines
7.4 KiB
229 lines
7.4 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local format = string.format;
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local setmetatable, type = setmetatable, type;
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local pairs, ipairs = pairs, ipairs;
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local char = string.char;
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local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
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local log = require "util.logger".init("datamanager");
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local io_open = io.open;
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local os_remove = os.remove;
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local tostring, tonumber = tostring, tonumber;
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local error = error;
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local next = next;
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local t_insert = table.insert;
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local append = require "util.serialization".append;
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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)
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local lfs = require "lfs";
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local prosody = prosody;
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local raw_mkdir;
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if prosody.platform == "posix" then
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raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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else
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raw_mkdir = lfs.mkdir;
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end
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module "datamanager"
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---- utils -----
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local encode, decode;
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do
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local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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decode = function (s)
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return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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end
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encode = function (s)
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return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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end
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end
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local _mkdir = {};
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local function mkdir(path)
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path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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if not _mkdir[path] then
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raw_mkdir(path);
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_mkdir[path] = true;
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end
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return path;
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end
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local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
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local callbacks = {};
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------- API -------------
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function set_data_path(path)
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log("debug", "Setting data path to: %s", path);
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data_path = path;
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end
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local function callback(username, host, datastore, data)
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for _, f in ipairs(callbacks) do
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username, host, datastore, data = f(username, host, datastore, data);
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if username == false then break; end
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end
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return username, host, datastore, data;
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end
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function add_callback(func)
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if not callbacks[func] then -- Would you really want to set the same callback more than once?
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callbacks[func] = true;
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callbacks[#callbacks+1] = func;
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return true;
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end
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end
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function remove_callback(func)
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if callbacks[func] then
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for i, f in ipairs(callbacks) do
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if f == func then
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callbacks[i] = nil;
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callbacks[f] = nil;
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return true;
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end
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end
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end
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end
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function getpath(username, host, datastore, ext, create)
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ext = ext or "dat";
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host = (host and encode(host)) or "_global";
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username = username and encode(username);
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if username then
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if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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elseif host then
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if create then mkdir(mkdir(data_path).."/"..host); end
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return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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else
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if create then mkdir(data_path); end
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return format("%s/%s.%s", data_path, datastore, ext);
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end
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end
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function load(username, host, datastore)
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local data, ret = loadfile(getpath(username, host, datastore));
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if not data then
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local mode = lfs.attributes(getpath(username, host, datastore), "mode");
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if not mode then
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log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil;
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else -- file exists, but can't be read
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-- TODO more detailed error checking and logging?
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log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil, "Error reading storage";
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end
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end
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setfenv(data, {});
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local success, ret = pcall(data);
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if not success then
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log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil, "Error reading storage";
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end
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return ret;
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end
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function store(username, host, datastore, data)
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if not data then
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data = {};
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end
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username, host, datastore, data = callback(username, host, datastore, data);
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if username == false then
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return true; -- Don't save this data at all
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end
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-- save the datastore
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local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
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if not f then
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log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil, "Error saving to storage";
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end
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f:write("return ");
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append(f, data);
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f:close();
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if next(data) == nil then -- try to delete empty datastore
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log("debug", "Removing empty %s datastore for user %s@%s at %q", datastore, username or "nil", host or "nil", getpath(username, host, datastore));
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os_remove(getpath(username, host, datastore));
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end
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-- we write data even when we are deleting because lua doesn't have a
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-- platform independent way of checking for non-exisitng files
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return true;
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end
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function list_append(username, host, datastore, data)
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if not data then return; end
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if callback(username, host, datastore, data) == false then return true; end
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-- save the datastore
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local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
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if not f then
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log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return;
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end
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f:write("item(");
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append(f, data);
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f:write(");\n");
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f:close();
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return true;
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end
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function list_store(username, host, datastore, data)
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if not data then
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data = {};
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end
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if callback(username, host, datastore, data) == false then return true; end
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-- save the datastore
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local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
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if not f then
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log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return;
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end
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for _, d in ipairs(data) do
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f:write("item(");
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append(f, d);
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f:write(");\n");
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end
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f:close();
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if next(data) == nil then -- try to delete empty datastore
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log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
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os_remove(getpath(username, host, datastore, "list"));
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end
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-- we write data even when we are deleting because lua doesn't have a
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-- platform independent way of checking for non-exisitng files
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return true;
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end
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function list_load(username, host, datastore)
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local data, ret = loadfile(getpath(username, host, datastore, "list"));
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if not data then
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local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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if not mode then
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log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil;
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else -- file exists, but can't be read
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-- TODO more detailed error checking and logging?
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log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil, "Error reading storage";
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end
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end
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local items = {};
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setfenv(data, {item = function(i) t_insert(items, i); end});
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local success, ret = pcall(data);
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if not success then
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log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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return nil, "Error reading storage";
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end
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return items;
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end
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return _M;
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