Sat, 15 Nov 2008 08:38:25 +0500
Log how many queued stanzas we send
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 = log; 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 indent = function(f, i) for n = 1, i do f:write("\t"); end end module "datamanager" ---- utils ----- local encode, decode; local log = function (type, msg) return log(type, "datamanager", msg); end 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("%%%x", c:byte()); end)); end end local function basicSerialize (o) if type(o) == "number" or type(o) == "boolean" then return tostring(o); else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise. return (format("%q", tostring(o)):gsub("\\\n", "\\n")); end end local function simplesave (f, o, ind) if type(o) == "number" then f:write(o) elseif type(o) == "string" then f:write((format("%q", o):gsub("\\\n", "\\n"))) elseif type(o) == "table" then f:write("{\n") for k,v in pairs(o) do indent(f, ind); f:write("[", basicSerialize(k), "] = ") simplesave(f, v, ind+1) f:write(",\n") end indent(f, ind-1); f:write("}") elseif type(o) == "boolean" then f:write(o and "true" or "false"); else error("cannot serialize a " .. type(o)) end end ------- API ------------- function getpath(username, host, datastore, ext) ext = ext or "dat"; if username then return format("data/%s/%s/%s.%s", encode(host), datastore, encode(username), ext); elseif host then return format("data/%s/%s.%s", encode(host), datastore, ext); else return format("data/%s.%s", datastore, ext); end end function load(username, host, datastore) local data, ret = loadfile(getpath(username, host, datastore)); if not data then log("warn", "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 -- save the datastore local f, msg = io_open(getpath(username, host, datastore), "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 "); simplesave(f, data, 1); f:close(); if not next(data) then -- try to delete empty datastore 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 -- save the datastore local f, msg = io_open(getpath(username, host, datastore, "list"), "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("); simplesave(f, data, 1); f:write(");\n"); f:close(); return true; end function list_store(username, host, datastore, data) if not data then data = {}; end -- save the datastore local f, msg = io_open(getpath(username, host, datastore, "list"), "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("); simplesave(f, d, 1); f:write(");\n"); end f:close(); if not next(data) then -- try to delete empty datastore 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("warn", "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;