prosody
4ae3e81513f3
util/datamanager.lua

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util/datamanager.lua @ 615:4ae3e81513f3

0.1 -> 0.2
author Matthew Wild <mwild1@gmail.com>
date Wed, 10 Dec 2008 15:44:03 +0000
parent 574:5963b780775d
child 628:3712d36b6d25
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615
4ae3e81513f3 0.1 -> 0.2
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diff changeset
1 -- Prosody IM v0.2
519
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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
0
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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 log("info", "Setting data path to %s", path);
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56 data_path = path;
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57 end
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58
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59 function getpath(username, host, datastore, ext)
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60 ext = ext or "dat";
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61 if username then
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62 return format("%s/%s/%s/%s.%s", data_path, encode(host), datastore, encode(username), ext);
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63 elseif host then
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64 return format("%s/%s/%s.%s", data_path, encode(host), datastore, ext);
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65 else
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66 return format("%s/%s.%s", data_path, datastore, ext);
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67 end
0
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68 end
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69
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70 function load(username, host, datastore)
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71 local data, ret = loadfile(getpath(username, host, datastore));
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72 if not data then
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73 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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74 return nil;
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75 end
0
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76 setfenv(data, {});
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77 local success, ret = pcall(data);
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78 if not success then
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79 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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80 return nil;
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81 end
0
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82 return ret;
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83 end
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84
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85 function store(username, host, datastore, data)
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86 if not data then
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87 data = {};
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88 end
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89 -- save the datastore
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90 local f, msg = io_open(getpath(username, host, datastore), "w+");
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91 if not f then
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92 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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93 return;
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94 end
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95 f:write("return ");
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96 append(f, data);
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97 f:close();
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98 if not next(data) then -- try to delete empty datastore
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99 os_remove(getpath(username, host, datastore));
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100 end
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101 -- we write data even when we are deleting because lua doesn't have a
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102 -- platform independent way of checking for non-exisitng files
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103 return true;
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104 end
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105
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106 function list_append(username, host, datastore, data)
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107 if not data then return; end
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108 -- save the datastore
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109 local f, msg = io_open(getpath(username, host, datastore, "list"), "a+");
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110 if not f then
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111 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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112 return;
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113 end
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114 f:write("item(");
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115 append(f, data);
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116 f:write(");\n");
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117 f:close();
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118 return true;
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119 end
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120
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121 function list_store(username, host, datastore, data)
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122 if not data then
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123 data = {};
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124 end
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125 -- save the datastore
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126 local f, msg = io_open(getpath(username, host, datastore, "list"), "w+");
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127 if not f then
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128 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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129 return;
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130 end
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131 for _, d in ipairs(data) do
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132 f:write("item(");
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133 append(f, d);
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134 f:write(");\n");
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135 end
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136 f:close();
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137 if not next(data) then -- try to delete empty datastore
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138 os_remove(getpath(username, host, datastore, "list"));
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139 end
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140 -- we write data even when we are deleting because lua doesn't have a
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141 -- platform independent way of checking for non-exisitng files
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142 return true;
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143 end
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144
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145 function list_load(username, host, datastore)
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146 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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147 if not data then
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148 log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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149 return nil;
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150 end
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151 local items = {};
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152 setfenv(data, {item = function(i) t_insert(items, i); end});
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153 local success, ret = pcall(data);
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154 if not success then
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155 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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156 return nil;
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157 end
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158 return items;
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159 end
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160
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161 return _M;