prosody
0d9f03009b8a
util/datamanager.lua

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util/datamanager.lua @ 188:0d9f03009b8a

mod_version is here
author Matthew Wild <mwild1@gmail.com>
date Thu, 30 Oct 2008 21:26:53 +0000
parent 182:f5cb6b5a6eb7
child 206:e30d0e30a0ff
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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 local tostring = tostring;
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9 local error = error;
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10
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11 local indent = function(f, i)
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12 for n = 1, i do
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13 f:write("\t");
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14 end
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15 end
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16
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17 module "datamanager"
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18
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19
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20 ---- utils -----
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21 local encode, decode;
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22
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23 local log = function (type, msg) return log(type, "datamanager", msg); end
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24
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25 do
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26 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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27
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28 decode = function (s)
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29 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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30 end
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31
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32 encode = function (s)
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33 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
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34 end
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35 end
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36
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37 local function basicSerialize (o)
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38 if type(o) == "number" or type(o) == "boolean" then
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39 return tostring(o);
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40 else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise.
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41 return (format("%q", tostring(o)):gsub("\\\n", "\\n"));
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42 end
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43 end
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44
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45
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46 local function simplesave (f, o, ind)
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47 if type(o) == "number" then
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48 f:write(o)
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49 elseif type(o) == "string" then
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50 f:write((format("%q", o):gsub("\\\n", "\\n")))
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51 elseif type(o) == "table" then
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52 f:write("{\n")
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53 for k,v in pairs(o) do
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54 indent(f, ind);
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55 f:write("[", basicSerialize(k), "] = ")
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56 simplesave(f, v, ind+1)
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57 f:write(",\n")
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58 end
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59 indent(f, ind-1);
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60 f:write("}")
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61 elseif type(o) == "boolean" then
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62 f:write(o and "true" or "false");
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63 else
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64 error("cannot serialize a " .. type(o))
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65 end
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66 end
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67
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68 ------- API -------------
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69
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70 function getpath(username, host, datastore)
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71 if username then
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72 return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
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73 elseif host then
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74 return format("data/%s/%s.dat", encode(host), datastore);
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75 else
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76 return format("data/%s.dat", datastore);
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77 end
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78 end
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79
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80 function load(username, host, datastore)
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81 local data, ret = loadfile(getpath(username, host, datastore));
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82 if not data then
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83 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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84 return nil;
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85 end
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86 setfenv(data, {});
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87 local success, ret = pcall(data);
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88 if not success then
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89 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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90 return nil;
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91 end
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92 return ret;
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93 end
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94
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95 function store(username, host, datastore, data)
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96 local f, msg = io_open(getpath(username, host, datastore), "w+");
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97 if not f then
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98 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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99 return nil;
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100 end
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101 f:write("return ");
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102 simplesave(f, data, 1);
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103 f:close();
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104 return true;
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105 end
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106
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107 return _M;