prosody
bffdaeb7ab5e
util/datamanager.lua

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util/datamanager.lua @ 2500:bffdaeb7ab5e

mod_privacy: Cleaned up code.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 26 Jan 2010 02:07:13 +0500
parent 2444:267d6482bac6
child 2583:cb1f9266130b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local format = string.format;
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11 local setmetatable, type = setmetatable, type;
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12 local pairs, ipairs = pairs, ipairs;
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13 local char = string.char;
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14 local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
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15 local log = require "util.logger".init("datamanager");
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16 local io_open = io.open;
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17 local os_remove = os.remove;
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18 local tostring, tonumber = tostring, tonumber;
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19 local error = error;
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20 local next = next;
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21 local t_insert = table.insert;
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22 local append = require "util.serialization".append;
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23 local path_separator = "/"; if os.getenv("WINDIR") then path_separator = "\\" end
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24 local raw_mkdir;
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25
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26 if prosody.platform == "posix" then
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27 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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28 else
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29 raw_mkdir = require "lfs".mkdir;
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30 end
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31
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32 module "datamanager"
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33
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34 ---- utils -----
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35 local encode, decode;
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36 do
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37 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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38
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39 decode = function (s)
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40 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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41 end
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42
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43 encode = function (s)
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44 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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45 end
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46 end
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47
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48 local _mkdir = {};
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49 local function mkdir(path)
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50 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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51 if not _mkdir[path] then
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52 raw_mkdir(path);
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53 _mkdir[path] = true;
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54 end
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55 return path;
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56 end
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57
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58 local data_path = "data";
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59 local callbacks = {};
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60
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61 ------- API -------------
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62
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63 function set_data_path(path)
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64 log("debug", "Setting data path to: %s", path);
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65 data_path = path;
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66 end
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67
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68 local function callback(username, host, datastore, data)
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69 for _, f in ipairs(callbacks) do
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70 username, host, datastore, data = f(username, host, datastore, data);
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71 if username == false then break; end
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72 end
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73
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74 return username, host, datastore, data;
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75 end
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76 function add_callback(func)
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77 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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78 callbacks[func] = true;
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79 callbacks[#callbacks+1] = func;
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80 return true;
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81 end
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82 end
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83 function remove_callback(func)
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84 if callbacks[func] then
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85 for i, f in ipairs(callbacks) do
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86 if f == func then
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87 callbacks[i] = nil;
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88 callbacks[f] = nil;
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89 return true;
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90 end
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91 end
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92 end
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93 end
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94
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95 function getpath(username, host, datastore, ext, create)
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96 ext = ext or "dat";
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97 host = (host and encode(host)) or "_global";
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98 username = username and encode(username);
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99 if username then
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100 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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101 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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102 elseif host then
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103 if create then mkdir(mkdir(data_path).."/"..host); end
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104 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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105 else
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106 if create then mkdir(data_path); end
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107 return format("%s/%s.%s", data_path, datastore, ext);
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108 end
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109 end
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110
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111 function load(username, host, datastore)
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112 local data, ret = loadfile(getpath(username, host, datastore));
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113 if not data then
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114 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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115 return nil;
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116 end
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117 setfenv(data, {});
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118 local success, ret = pcall(data);
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119 if not success then
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120 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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121 return nil;
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122 end
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123 return ret;
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124 end
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125
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126 function store(username, host, datastore, data)
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127 if not data then
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128 data = {};
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129 end
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130
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131 username, host, datastore, data = callback(username, host, datastore, data);
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132 if username == false then
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133 return true; -- Don't save this data at all
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134 end
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135
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136 -- save the datastore
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137 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
117
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parents: 88
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138 if not f then
182
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parents: 177
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139 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
206
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140 return;
117
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parents: 88
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141 end
0
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142 f:write("return ");
550
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143 append(f, data);
0
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144 f:close();
915
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Matthew Wild <mwild1@gmail.com>
parents: 896
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145 if next(data) == nil then -- try to delete empty datastore
1732
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parents: 1523
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146 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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147 os_remove(getpath(username, host, datastore));
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148 end
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parents: 182
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149 -- we write data even when we are deleting because lua doesn't have a
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parents: 182
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150 -- platform independent way of checking for non-exisitng files
0
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151 return true;
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152 end
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153
247
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154 function list_append(username, host, datastore, data)
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155 if not data then return; end
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156 if callback(username, host, datastore) == false then return true; end
247
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parents: 206
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157 -- save the datastore
643
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158 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
247
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parents: 206
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159 if not f then
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160 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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161 return;
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162 end
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163 f:write("item(");
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164 append(f, data);
247
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165 f:write(");\n");
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parents: 206
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166 f:close();
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167 return true;
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parents: 206
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168 end
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parents: 206
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169
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170 function list_store(username, host, datastore, data)
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171 if not data then
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172 data = {};
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173 end
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parents: 1381
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174 if callback(username, host, datastore) == false then return true; end
247
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parents: 206
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175 -- save the datastore
643
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parents: 628
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176 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
247
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parents: 206
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177 if not f then
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178 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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179 return;
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180 end
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parents: 206
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181 for _, d in ipairs(data) do
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182 f:write("item(");
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183 append(f, d);
247
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184 f:write(");\n");
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parents: 206
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185 end
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parents: 206
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186 f:close();
915
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Matthew Wild <mwild1@gmail.com>
parents: 896
diff changeset
187 if next(data) == nil then -- try to delete empty datastore
1732
f1282fad2f99 datamanager: Fixed logging errors on deletion of datastores not owned by a user@host
Waqas Hussain <waqas20@gmail.com>
parents: 1523
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188 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
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189 os_remove(getpath(username, host, datastore, "list"));
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190 end
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parents: 206
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191 -- we write data even when we are deleting because lua doesn't have a
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parents: 206
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192 -- platform independent way of checking for non-exisitng files
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193 return true;
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194 end
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195
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196 function list_load(username, host, datastore)
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197 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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parents: 206
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198 if not data then
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parents: 643
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199 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
247
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parents: 206
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200 return nil;
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parents: 206
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201 end
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parents: 206
diff changeset
202 local items = {};
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parents: 206
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203 setfenv(data, {item = function(i) t_insert(items, i); end});
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parents: 206
diff changeset
204 local success, ret = pcall(data);
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parents: 206
diff changeset
205 if not success then
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parents: 206
diff changeset
206 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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parents: 206
diff changeset
207 return nil;
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parents: 206
diff changeset
208 end
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parents: 206
diff changeset
209 return items;
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parents: 206
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210 end
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parents: 206
diff changeset
211
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parents: 206
diff changeset
212 return _M;