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prosody
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util/datamanager.lua @ 3942:0323beb7183c
util.pubsub: Use correct node name when returning a list of multiple nodes in a subscriptions response
author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 22 Dec 2010 16:45:32 +0000 |
parent | 3723:72a917d910a4 |
child | 4093:36555949bd16 |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 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 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 local lfs = require "lfs"; 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 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 raw_mkdir(path); _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 username == false 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)) 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 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 local mode = lfs.attributes(getpath(username, host, datastore), "mode"); if not mode then log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); return nil; else -- file exists, but can't be read -- TODO more detailed error checking and logging? log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); return nil, "Error reading storage"; end 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, "Error reading storage"; 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 username == false 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 nil, "Error saving to storage"; 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)); 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(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 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(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 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 or "nil", host or "nil"); 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 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode"); if not mode then log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); return nil; else -- file exists, but can't be read -- TODO more detailed error checking and logging? log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil")); return nil, "Error reading storage"; end 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, "Error reading storage"; end return items; end return _M;