prosody
1ed3e5fe165a
util/datamanager.lua

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util/datamanager.lua @ 932:1ed3e5fe165a

Added: datamanager: Allow a callback to be installed which selectively prevents disk writes
author Waqas Hussain <waqas20@gmail.com>
date Mon, 30 Mar 2009 03:22:34 +0500
parent 915:0fe5bf7ab81d
child 1097:c5b33640a5f0
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rev   line source
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1 -- Prosody IM v0.4
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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 io_popen = io.popen;
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19 local tostring, tonumber = tostring, tonumber;
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20 local error = error;
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21 local next = next;
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22 local t_insert = table.insert;
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23 local append = require "util.serialization".append;
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24 local path_separator = "/"; if os.getenv("WINDIR") then path_separator = "\\" end
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25
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26 module "datamanager"
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27
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28 ---- utils -----
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29 local encode, decode;
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30 do
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31 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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32
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33 decode = function (s)
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34 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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35 end
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36
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37 encode = function (s)
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38 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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39 end
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40 end
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41
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42 local _mkdir = {};
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43 local function mkdir(path)
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44 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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45 if not _mkdir[path] then
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46 local x = io_popen("mkdir \""..path.."\" 2>&1"):read("*a");
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47 _mkdir[path] = true;
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48 end
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49 return path;
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50 end
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51
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52 local data_path = "data";
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53 local callback;
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54
0
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55 ------- API -------------
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56
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57 function set_data_path(path)
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58 log("info", "Setting data path to: %s", path);
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59 data_path = path;
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60 end
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61 function set_callback(func)
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62 callback = func;
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63 end
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64
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65 function getpath(username, host, datastore, ext, create)
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66 ext = ext or "dat";
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67 host = host and encode(host);
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68 username = username and encode(username);
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69 if username then
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70 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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71 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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72 elseif host then
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73 if create then mkdir(mkdir(data_path).."/"..host); end
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74 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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75 else
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76 if create then mkdir(data_path); end
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77 return format("%s/%s.%s", data_path, datastore, ext);
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78 end
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79 end
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80
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81 function load(username, host, datastore)
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82 local data, ret = loadfile(getpath(username, host, datastore));
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83 if not data then
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84 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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85 return nil;
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86 end
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87 setfenv(data, {});
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88 local success, ret = pcall(data);
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89 if not success then
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90 log("error", "Unable to load "..datastore.." storage ('"..ret.."') 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 return ret;
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94 end
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95
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96 function store(username, host, datastore, data)
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97 if not data then
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98 data = {};
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99 end
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100 if callback and callback(username, host, datastore) then return true; end
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101 -- save the datastore
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102 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
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103 if not f then
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104 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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105 return;
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106 end
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107 f:write("return ");
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108 append(f, data);
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109 f:close();
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110 if next(data) == nil then -- try to delete empty datastore
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111 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username, host);
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112 os_remove(getpath(username, host, datastore));
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113 end
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114 -- we write data even when we are deleting because lua doesn't have a
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115 -- platform independent way of checking for non-exisitng files
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116 return true;
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117 end
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118
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119 function list_append(username, host, datastore, data)
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120 if not data then return; end
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121 if callback and callback(username, host, datastore) then return true; end
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122 -- save the datastore
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123 local f, msg = io_open(getpath(username, host, datastore, "list", true), "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 append(f, data);
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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 if callback and callback(username, host, datastore) then return true; end
247
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140 -- save the datastore
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141 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
247
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142 if not f then
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143 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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144 return;
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145 end
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146 for _, d in ipairs(data) do
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147 f:write("item(");
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148 append(f, d);
247
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149 f:write(");\n");
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150 end
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151 f:close();
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152 if next(data) == nil then -- try to delete empty datastore
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153 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username, host);
247
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154 os_remove(getpath(username, host, datastore, "list"));
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155 end
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156 -- we write data even when we are deleting because lua doesn't have a
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157 -- platform independent way of checking for non-exisitng files
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158 return true;
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159 end
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160
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161 function list_load(username, host, datastore)
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162 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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163 if not data then
706
ce772e283992 datamanager: Change log message from type "warn" to "debug" when loading a file fails
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164 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
247
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165 return nil;
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166 end
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167 local items = {};
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168 setfenv(data, {item = function(i) t_insert(items, i); end});
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169 local success, ret = pcall(data);
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170 if not success then
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171 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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172 return nil;
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173 end
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174 return items;
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175 end
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176
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177 return _M;