prosody
56bdfae9e4ea
util/datamanager.lua

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util/datamanager.lua @ 550:56bdfae9e4ea

Changed util.datamanager to use util.serialization
author Waqas Hussain <waqas20@gmail.com>
date Fri, 05 Dec 2008 00:16:38 +0500
parent 519:cccd610a0ef9
child 574:5963b780775d
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519
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 --
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19
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20
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21 local format = string.format;
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22 local setmetatable, type = setmetatable, type;
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23 local pairs, ipairs = pairs, ipairs;
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24 local char = string.char;
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25 local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
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26 local log = require "util.logger".init("datamanager");
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27 local io_open = io.open;
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28 local os_remove = os.remove;
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29 local tostring, tonumber = tostring, tonumber;
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30 local error = error;
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31 local next = next;
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32 local t_insert = table.insert;
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33 local append = require "util.serialization".append;
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34
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35 module "datamanager"
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36
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37 ---- utils -----
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38 local encode, decode;
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39 do
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40 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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41
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42 decode = function (s)
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43 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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44 end
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45
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46 encode = function (s)
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47 return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
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48 end
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49 end
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50
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51 ------- API -------------
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52
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53 local data_path = "data";
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54 function set_data_path(path)
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55 data_path = path;
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56 end
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57
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58 function getpath(username, host, datastore, ext)
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59 ext = ext or "dat";
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60 if username then
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61 return format("%s/%s/%s/%s.%s", data_path, encode(host), datastore, encode(username), ext);
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62 elseif host then
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63 return format("%s/%s/%s.%s", data_path, encode(host), datastore, ext);
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64 else
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65 return format("%s/%s.%s", data_path, datastore, ext);
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66 end
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67 end
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68
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69 function load(username, host, datastore)
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70 local data, ret = loadfile(getpath(username, host, datastore));
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71 if not data then
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72 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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73 return nil;
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74 end
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75 setfenv(data, {});
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76 local success, ret = pcall(data);
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77 if not success then
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78 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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79 return nil;
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80 end
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81 return ret;
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82 end
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83
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84 function store(username, host, datastore, data)
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85 if not data then
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86 data = {};
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87 end
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88 -- save the datastore
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89 local f, msg = io_open(getpath(username, host, datastore), "w+");
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90 if not f then
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91 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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92 return;
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93 end
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94 f:write("return ");
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95 append(f, data);
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96 f:close();
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97 if not next(data) then -- try to delete empty datastore
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98 os_remove(getpath(username, host, datastore));
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99 end
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100 -- we write data even when we are deleting because lua doesn't have a
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101 -- platform independent way of checking for non-exisitng files
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102 return true;
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103 end
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104
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105 function list_append(username, host, datastore, data)
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106 if not data then return; end
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107 -- save the datastore
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108 local f, msg = io_open(getpath(username, host, datastore, "list"), "a+");
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109 if not f then
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110 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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111 return;
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112 end
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113 f:write("item(");
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114 append(f, data);
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115 f:write(");\n");
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116 f:close();
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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_store(username, host, datastore, data)
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121 if not data then
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122 data = {};
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123 end
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124 -- save the datastore
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125 local f, msg = io_open(getpath(username, host, datastore, "list"), "w+");
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126 if not f then
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127 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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128 return;
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129 end
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130 for _, d in ipairs(data) do
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131 f:write("item(");
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132 append(f, d);
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133 f:write(");\n");
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134 end
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135 f:close();
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136 if not next(data) then -- try to delete empty datastore
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137 os_remove(getpath(username, host, datastore, "list"));
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138 end
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139 -- we write data even when we are deleting because lua doesn't have a
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140 -- platform independent way of checking for non-exisitng files
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141 return true;
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142 end
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143
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144 function list_load(username, host, datastore)
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145 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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146 if not data then
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147 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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148 return nil;
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149 end
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150 local items = {};
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151 setfenv(data, {item = function(i) t_insert(items, i); end});
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152 local success, ret = pcall(data);
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153 if not success then
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154 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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155 return nil;
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156 end
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157 return items;
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158 end
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159
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160 return _M;