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local format = string.format;
local setmetatable, type = setmetatable, type;
local pairs = pairs;
local char = string.char;
local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
local log = log;
local io_open = io.open;
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
return string.format("%q", tostring(o))
end
end
local function simplesave (f, o)
if type(o) == "number" then
f:write(o)
elseif type(o) == "string" then
f:write(format("%q", o))
elseif type(o) == "table" then
f:write("{\n")
for k,v in pairs(o) do
f:write(" [", basicSerialize(k), "] = ")
simplesave(f, v)
f:write(",\n")
end
f:write("}\n")
else
error("cannot serialize a " .. type(o))
end
end
------- API -------------
function getpath(username, host, datastore)
if username then
return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
elseif host then
return format("data/%s/%s.dat", encode(host), datastore);
else
return format("data/%s.dat", datastore);
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.."@"..host); 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.."@"..host); return nil; end
return ret;
end
function store(username, host, datastore, data)
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.."@"..host); return nil; end
f:write("return ");
simplesave(f, data);
f:close();
return true;
end
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