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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;
local os_remove = os.remove;
local tostring = tostring;
local error = error;
local next = next;
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)
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 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
return _M;
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