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local format = string.format; |
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local setmetatable, type = setmetatable, type; |
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local pairs = pairs; |
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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 = log; |
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local io_open = io.open; |
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module "datamanager" |
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---- utils ----- |
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local encode, decode; |
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local log = function (type, msg) return log(type, "datamanager", msg); end |
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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("%%%x", c:byte()); end)); |
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end |
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end |
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local function basicSerialize (o) |
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if type(o) == "number" or type(o) == "boolean" then |
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return tostring(o) |
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else -- assume it is a string |
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return string.format("%q", tostring(o)) |
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end |
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end |
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local function simplesave (f, o) |
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if type(o) == "number" then |
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f:write(o) |
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elseif type(o) == "string" then |
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f:write(format("%q", o)) |
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elseif type(o) == "table" then |
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f:write("{\n") |
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for k,v in pairs(o) do |
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f:write(" [", format("%q", k), "] = ") |
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simplesave(f, v) |
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f:write(",\n") |
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end |
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f:write("}\n") |
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else |
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error("cannot serialize a " .. type(o)) |
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end |
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end |
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------- API ------------- |
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function getpath(username, host, datastore) |
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return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username)); |
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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 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end |
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setfenv(data, {}); |
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local success, ret = pcall(data); |
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if not success then log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; 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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local f, msg = io_open(getpath(username, host, datastore), "w+"); |
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if not f then log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..username.."@"..host); return nil; end |
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f:write("return "); |
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simplesave(f, data); |
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f:close(); |
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return true; |
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end |
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