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annotate util/datamanager.lua @ 82:cbf387f29d56

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Fix for saving tables with non-string keys
author Matthew Wild <mwild1@gmail.com>
date Wed, 08 Oct 2008 22:42:51 +0100
parents 3e3171b59028
children 059ef1c30844
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1 local format = string.format;
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2 local setmetatable, type = setmetatable, type;
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3 local pairs = pairs;
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4 local char = string.char;
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5 local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
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6 local log = log;
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7 local io_open = io.open;
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8
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9 module "datamanager"
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10
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11
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12 ---- utils -----
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13 local encode, decode;
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14
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15 local log = function (type, msg) return log(type, "datamanager", msg); end
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16
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17 do
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18 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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19
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20 decode = function (s)
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21 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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22 end
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23
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24 encode = function (s)
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25 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
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26 end
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27 end
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28
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29 local function basicSerialize (o)
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30 if type(o) == "number" or type(o) == "boolean" then
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31 return tostring(o)
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32 else -- assume it is a string
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33 return string.format("%q", tostring(o))
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34 end
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35 end
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36
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37
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38 local function simplesave (f, o)
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39 if type(o) == "number" then
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40 f:write(o)
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41 elseif type(o) == "string" then
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42 f:write(format("%q", o))
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43 elseif type(o) == "table" then
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44 f:write("{\n")
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45 for k,v in pairs(o) do
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cbf387f29d56 Fix for saving tables with non-string keys
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46 f:write(" [", basicSerialize(k), "] = ")
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47 simplesave(f, v)
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48 f:write(",\n")
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49 end
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50 f:write("}\n")
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51 else
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52 error("cannot serialize a " .. type(o))
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53 end
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54 end
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55
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56 ------- API -------------
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57
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58 function getpath(username, host, datastore)
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59 return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
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60 end
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61
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62 function load(username, host, datastore)
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63 local data, ret = loadfile(getpath(username, host, datastore));
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64 if not data then log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
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65 setfenv(data, {});
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66 local success, ret = pcall(data);
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67 if not success then log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
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68 return ret;
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69 end
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70
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71 function store(username, host, datastore, data)
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72 local f, msg = io_open(getpath(username, host, datastore), "w+");
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73 if not f then log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..username.."@"..host); return nil; end
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74 f:write("return ");
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75 simplesave(f, data);
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76 f:close();
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77 return true;
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78 end
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79