prosody
f15b6ed967b7
util/datamanager.lua

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util/datamanager.lua @ 3722:f15b6ed967b7

util.datamanager: When failing to load a list file, and the file exists, log an error, and return nil, error.
author Waqas Hussain <waqas20@gmail.com>
date Fri, 10 Dec 2010 00:21:09 +0500
parent 3108:df0df92dd58a
child 3723:72a917d910a4
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) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 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 lfs = require "lfs";
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25 local raw_mkdir;
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26
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27 if prosody.platform == "posix" then
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28 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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29 else
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30 raw_mkdir = lfs.mkdir;
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31 end
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32
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33 module "datamanager"
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34
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35 ---- utils -----
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36 local encode, decode;
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37 do
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38 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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39
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40 decode = function (s)
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41 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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42 end
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43
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44 encode = function (s)
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45 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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46 end
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47 end
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48
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49 local _mkdir = {};
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50 local function mkdir(path)
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51 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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52 if not _mkdir[path] then
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53 raw_mkdir(path);
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54 _mkdir[path] = true;
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55 end
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56 return path;
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57 end
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58
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59 local data_path = "data";
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60 local callbacks = {};
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61
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62 ------- API -------------
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63
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64 function set_data_path(path)
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65 log("debug", "Setting data path to: %s", path);
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66 data_path = path;
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67 end
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68
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69 local function callback(username, host, datastore, data)
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70 for _, f in ipairs(callbacks) do
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71 username, host, datastore, data = f(username, host, datastore, data);
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72 if username == false then break; end
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73 end
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74
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75 return username, host, datastore, data;
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76 end
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77 function add_callback(func)
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78 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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79 callbacks[func] = true;
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80 callbacks[#callbacks+1] = func;
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81 return true;
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82 end
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83 end
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84 function remove_callback(func)
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85 if callbacks[func] then
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86 for i, f in ipairs(callbacks) do
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87 if f == func then
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88 callbacks[i] = nil;
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89 callbacks[f] = nil;
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90 return true;
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91 end
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92 end
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93 end
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94 end
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95
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96 function getpath(username, host, datastore, ext, create)
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97 ext = ext or "dat";
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98 host = (host and encode(host)) or "_global";
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99 username = username and encode(username);
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100 if username then
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101 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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102 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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103 elseif host then
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104 if create then mkdir(mkdir(data_path).."/"..host); end
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105 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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106 else
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107 if create then mkdir(data_path); end
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108 return format("%s/%s.%s", data_path, datastore, ext);
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109 end
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110 end
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111
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112 function load(username, host, datastore)
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113 local data, ret = loadfile(getpath(username, host, datastore));
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114 if not data then
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115 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
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116 if not mode then
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117 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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118 return nil;
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119 else -- file exists, but can't be read
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120 -- TODO more detailed error checking and logging?
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121 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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122 return nil, "Error reading storage";
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123 end
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124 end
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125 setfenv(data, {});
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126 local success, ret = pcall(data);
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127 if not success then
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128 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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129 return nil, "Error reading storage";
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130 end
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131 return ret;
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132 end
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133
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134 function store(username, host, datastore, data)
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135 if not data then
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136 data = {};
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137 end
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138
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139 username, host, datastore, data = callback(username, host, datastore, data);
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140 if username == false then
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141 return true; -- Don't save this data at all
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142 end
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143
206
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144 -- save the datastore
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145 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
117
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146 if not f then
182
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147 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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148 return nil, "Error saving to storage";
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149 end
0
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150 f:write("return ");
550
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151 append(f, data);
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152 f:close();
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153 if next(data) == nil then -- try to delete empty datastore
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154 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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155 os_remove(getpath(username, host, datastore));
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156 end
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157 -- we write data even when we are deleting because lua doesn't have a
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158 -- platform independent way of checking for non-exisitng files
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159 return true;
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160 end
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161
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162 function list_append(username, host, datastore, data)
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163 if not data then return; end
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164 if callback(username, host, datastore) == false then return true; end
247
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165 -- save the datastore
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166 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
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167 if not f then
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168 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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169 return;
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170 end
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171 f:write("item(");
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172 append(f, data);
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173 f:write(");\n");
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174 f:close();
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175 return true;
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176 end
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177
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178 function list_store(username, host, datastore, data)
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179 if not data then
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180 data = {};
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181 end
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182 if callback(username, host, datastore) == false then return true; end
247
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183 -- save the datastore
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184 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
247
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185 if not f then
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186 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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187 return;
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188 end
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189 for _, d in ipairs(data) do
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190 f:write("item(");
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191 append(f, d);
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192 f:write(");\n");
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193 end
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194 f:close();
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195 if next(data) == nil then -- try to delete empty datastore
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196 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
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197 os_remove(getpath(username, host, datastore, "list"));
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198 end
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199 -- we write data even when we are deleting because lua doesn't have a
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200 -- platform independent way of checking for non-exisitng files
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201 return true;
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202 end
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203
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204 function list_load(username, host, datastore)
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205 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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206 if not data then
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207 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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208 if not mode then
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209 log("debug", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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210 return nil;
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211 else -- file exists, but can't be read
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212 -- TODO more detailed error checking and logging?
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213 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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214 return nil, "Error reading storage";
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215 end
247
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216 end
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217 local items = {};
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218 setfenv(data, {item = function(i) t_insert(items, i); end});
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219 local success, ret = pcall(data);
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220 if not success then
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221 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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222 return nil;
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223 end
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224 return items;
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225 end
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226
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diff changeset
227 return _M;