prosody
681b29aa134f
util/datamanager.lua

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util/datamanager.lua @ 247:681b29aa134f

Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
author Waqas Hussain <waqas20@gmail.com>
date Thu, 13 Nov 2008 12:10:42 +0500
parent 206:e30d0e30a0ff
child 267:6303b7454ad0
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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, ipairs = pairs, ipairs;
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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 os_remove = os.remove;
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9 local tostring = tostring;
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10 local error = error;
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11 local next = next;
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12 local t_insert = table.insert;
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13
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14 local indent = function(f, i)
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15 for n = 1, i do
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16 f:write("\t");
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17 end
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18 end
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19
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20 module "datamanager"
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21
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22
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23 ---- utils -----
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24 local encode, decode;
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25
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26 local log = function (type, msg) return log(type, "datamanager", msg); end
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27
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28 do
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29 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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30
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31 decode = function (s)
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32 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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33 end
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34
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35 encode = function (s)
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36 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
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37 end
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38 end
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39
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40 local function basicSerialize (o)
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41 if type(o) == "number" or type(o) == "boolean" then
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42 return tostring(o);
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43 else -- assume it is a string -- FIXME make sure it's a string. throw an error otherwise.
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44 return (format("%q", tostring(o)):gsub("\\\n", "\\n"));
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45 end
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46 end
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47
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48
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49 local function simplesave (f, o, ind)
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50 if type(o) == "number" then
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51 f:write(o)
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52 elseif type(o) == "string" then
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53 f:write((format("%q", o):gsub("\\\n", "\\n")))
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54 elseif type(o) == "table" then
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55 f:write("{\n")
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56 for k,v in pairs(o) do
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57 indent(f, ind);
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58 f:write("[", basicSerialize(k), "] = ")
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59 simplesave(f, v, ind+1)
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60 f:write(",\n")
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61 end
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62 indent(f, ind-1);
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63 f:write("}")
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64 elseif type(o) == "boolean" then
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65 f:write(o and "true" or "false");
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66 else
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67 error("cannot serialize a " .. type(o))
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68 end
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69 end
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70
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71 ------- API -------------
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72
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73 function getpath(username, host, datastore, ext)
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74 ext = ext or "dat";
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75 if username then
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76 return format("data/%s/%s/%s.%s", encode(host), datastore, encode(username), ext);
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77 elseif host then
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78 return format("data/%s/%s.%s", encode(host), datastore, ext);
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79 else
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80 return format("data/%s.%s", datastore, ext);
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81 end
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82 end
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83
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84 function load(username, host, datastore)
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85 local data, ret = loadfile(getpath(username, host, datastore));
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86 if not data then
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87 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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88 return nil;
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89 end
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90 setfenv(data, {});
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91 local success, ret = pcall(data);
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92 if not success then
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93 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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94 return nil;
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95 end
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96 return ret;
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97 end
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98
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99 function store(username, host, datastore, data)
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100 if not data then
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101 data = {};
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102 end
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103 -- save the datastore
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104 local f, msg = io_open(getpath(username, host, datastore), "w+");
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105 if not f then
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106 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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107 return;
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108 end
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109 f:write("return ");
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110 simplesave(f, data, 1);
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111 f:close();
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112 if not next(data) then -- try to delete empty datastore
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113 os_remove(getpath(username, host, datastore));
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114 end
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115 -- we write data even when we are deleting because lua doesn't have a
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116 -- platform independent way of checking for non-exisitng files
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117 return true;
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118 end
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119
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120 function list_append(username, host, datastore, data)
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121 if not data then return; end
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122 -- save the datastore
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123 local f, msg = io_open(getpath(username, host, datastore, "list"), "a+");
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124 if not f then
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125 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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126 return;
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127 end
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128 f:write("item(");
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129 simplesave(f, data, 1);
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130 f:write(");\n");
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131 f:close();
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132 return true;
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133 end
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134
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135 function list_store(username, host, datastore, data)
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136 if not data then
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137 data = {};
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138 end
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139 -- save the datastore
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140 local f, msg = io_open(getpath(username, host, datastore, "list"), "w+");
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141 if not f then
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142 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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143 return;
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144 end
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145 for _, d in ipairs(data) do
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146 f:write("item(");
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147 simplesave(f, d, 1);
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148 f:write(");\n");
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149 end
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150 f:close();
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151 if not next(data) then -- try to delete empty datastore
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152 os_remove(getpath(username, host, datastore, "list"));
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153 end
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154 -- we write data even when we are deleting because lua doesn't have a
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155 -- platform independent way of checking for non-exisitng files
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156 return true;
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157 end
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158
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159 function list_load(username, host, datastore)
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160 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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161 if not data then
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162 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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163 return nil;
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164 end
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165 local items = {};
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166 setfenv(data, {item = function(i) t_insert(items, i); end});
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167 local success, ret = pcall(data);
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168 if not success then
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169 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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170 return nil;
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171 end
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172 return items;
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173 end
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174
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175 return _M;