prosody
606c433955e7
util/datamanager.lua

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util/datamanager.lua @ 177:606c433955e7

Bug fixes and checks for presence subscriptions, etc
author Waqas Hussain <waqas20@gmail.com>
date Sun, 26 Oct 2008 00:22:18 +0500
parent 129:0f119bece309
child 182:f5cb6b5a6eb7
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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 module "datamanager"
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12
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13
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14 ---- utils -----
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15 local encode, decode;
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16
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17 local log = function (type, msg) return log(type, "datamanager", msg); end
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18
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19 do
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20 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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21
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22 decode = function (s)
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23 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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24 end
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25
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26 encode = function (s)
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27 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
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28 end
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29 end
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30
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31 local function basicSerialize (o)
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32 if type(o) == "number" or type(o) == "boolean" then
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33 return tostring(o)
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34 else -- assume it is a string
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35 return format("%q", tostring(o))
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36 end
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37 end
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38
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39
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40 local function simplesave (f, o)
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41 if type(o) == "number" then
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42 f:write(o)
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43 elseif type(o) == "string" then
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44 f:write(format("%q", o))
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45 elseif type(o) == "table" then
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46 f:write("{\n")
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47 for k,v in pairs(o) do
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48 f:write(" [", basicSerialize(k), "] = ")
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49 simplesave(f, v)
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50 f:write(",\n")
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51 end
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52 f:write("}\n")
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53 elseif type(o) == "boolean" then
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54 f:write(o and "true" or "false");
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55 else
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56 error("cannot serialize a " .. type(o))
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57 end
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58 end
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59
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60 ------- API -------------
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61
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62 function getpath(username, host, datastore)
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63 if username then
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64 return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
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65 elseif host then
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66 return format("data/%s/%s.dat", encode(host), datastore);
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67 else
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68 return format("data/%s.dat", datastore);
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69 end
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70 end
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71
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72 function load(username, host, datastore)
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73 local data, ret = loadfile(getpath(username, host, datastore));
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74 if not data then
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75 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or nil).."@"..(host or nil));
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76 return nil;
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77 end
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78 setfenv(data, {});
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79 local success, ret = pcall(data);
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80 if not success then
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81 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or nil).."@"..(host or nil));
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82 return nil;
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83 end
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84 return ret;
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85 end
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86
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87 function store(username, host, datastore, data)
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88 local f, msg = io_open(getpath(username, host, datastore), "w+");
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89 if not f then
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90 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or nil).."@"..(host or nil));
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91 return nil;
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92 end
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93 f:write("return ");
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94 simplesave(f, data);
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95 f:close();
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96 return true;
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97 end
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98
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99 return _M;