prosody
4ba6940deed0
util/datamanager.lua

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util/datamanager.lua @ 5045:4ba6940deed0

util.datamanager: Use pposix.fallocate() to make sure appends succeed. Also add a fallback fallocate()
author Kim Alvefur <zash@zash.se>
date Sat, 28 Jul 2012 22:37:24 +0200
parent 5038:242c62ff8e77
child 5049:5d685f123332
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 pcall = 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 envloadfile = require"util.envload".envloadfile;
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24 local serialize = require "util.serialization".serialize;
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25 local path_separator = assert ( package.config:match ( "^([^\n]+)" ) , "package.config not in standard form" ) -- Extract directory seperator from package.config (an undocumented string that comes with lua)
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26 local lfs = require "lfs";
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27 local prosody = prosody;
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28 local raw_mkdir;
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29 local fallocate;
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31 if prosody.platform == "posix" then
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32 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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33 fallocate = require "util.pposix".fallocate;
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34 else
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35 raw_mkdir = lfs.mkdir;
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36 end
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37
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38 if not fallocate then -- Fallback
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39 function fallocate(f, offset, len)
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40 -- This assumes that current position == offset
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41 local fake_data = (" "):rep(len);
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42 local ok, msg = f:write(fake_data);
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43 if not ok then
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44 return ok, msg;
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45 end
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46 f:seek(offset);
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47 return true;
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48 end
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49 end
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50
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51 module "datamanager"
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52
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53 ---- utils -----
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54 local encode, decode;
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55 do
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56 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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57
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58 decode = function (s)
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59 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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60 end
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61
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62 encode = function (s)
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63 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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64 end
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65 end
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66
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67 local _mkdir = {};
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68 local function mkdir(path)
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69 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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70 if not _mkdir[path] then
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71 raw_mkdir(path);
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72 _mkdir[path] = true;
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73 end
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74 return path;
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75 end
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76
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77 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
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78 local callbacks = {};
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79
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80 ------- API -------------
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81
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82 function set_data_path(path)
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83 log("debug", "Setting data path to: %s", path);
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84 data_path = path;
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85 end
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86
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87 local function callback(username, host, datastore, data)
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88 for _, f in ipairs(callbacks) do
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89 username, host, datastore, data = f(username, host, datastore, data);
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90 if username == false then break; end
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91 end
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92
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93 return username, host, datastore, data;
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94 end
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95 function add_callback(func)
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96 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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97 callbacks[func] = true;
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98 callbacks[#callbacks+1] = func;
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99 return true;
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100 end
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101 end
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102 function remove_callback(func)
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103 if callbacks[func] then
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104 for i, f in ipairs(callbacks) do
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105 if f == func then
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106 callbacks[i] = nil;
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107 callbacks[f] = nil;
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108 return true;
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109 end
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110 end
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111 end
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112 end
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113
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114 function getpath(username, host, datastore, ext, create)
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115 ext = ext or "dat";
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116 host = (host and encode(host)) or "_global";
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117 username = username and encode(username);
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118 if username then
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119 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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120 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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121 elseif host then
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122 if create then mkdir(mkdir(data_path).."/"..host); end
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123 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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124 else
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125 if create then mkdir(data_path); end
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126 return format("%s/%s.%s", data_path, datastore, ext);
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127 end
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128 end
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129
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130 function load(username, host, datastore)
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131 local data, ret = envloadfile(getpath(username, host, datastore), {});
117
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132 if not data then
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133 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
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134 if not mode then
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135 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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136 return nil;
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137 else -- file exists, but can't be read
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138 -- TODO more detailed error checking and logging?
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139 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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140 return nil, "Error reading storage";
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141 end
117
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142 end
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143
0
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144 local success, ret = pcall(data);
117
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145 if not success then
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146 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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147 return nil, "Error reading storage";
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148 end
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149 return ret;
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150 end
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151
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152 function store(username, host, datastore, data)
206
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153 if not data then
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154 data = {};
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155 end
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156
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157 username, host, datastore, data = callback(username, host, datastore, data);
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158 if username == false then
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159 return true; -- Don't save this data at all
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160 end
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161
206
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162 -- save the datastore
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163 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
117
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164 if not f then
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165 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
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166 return nil, "Error saving to storage";
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167 end
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168 f:write("return ");
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169 append(f, data);
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170 f:close();
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171 if next(data) == nil then -- try to delete empty datastore
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172 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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173 os_remove(getpath(username, host, datastore));
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174 end
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175 -- we write data even when we are deleting because lua doesn't have a
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176 -- platform independent way of checking for non-exisitng files
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177 return true;
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178 end
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179
247
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180 function list_append(username, host, datastore, data)
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181 if not data then return; 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), "a");
247
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185 if not f then
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186 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
247
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187 return;
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188 end
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189 local data = "item(" .. serialize(data) .. ");\n";
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190 local pos = f:seek("end");
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191 local ok, msg = fallocate(f, pos, #data);
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192 f:seek("set", pos);
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193 if ok then
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194 f:write(data);
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195 else
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196 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
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197 return ok, msg;
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198 end
247
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199 f:close();
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200 return true;
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201 end
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diff changeset
202
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203 function list_store(username, host, datastore, data)
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204 if not data then
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205 data = {};
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206 end
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207 if callback(username, host, datastore) == false then return true; end
247
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208 -- save the datastore
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209 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
247
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210 if not f then
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211 log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
247
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212 return;
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213 end
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214 for _, d in ipairs(data) do
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215 f:write("item(");
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216 append(f, d);
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217 f:write(");\n");
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218 end
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219 f:close();
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parents: 896
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220 if next(data) == nil then -- try to delete empty datastore
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221 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
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222 os_remove(getpath(username, host, datastore, "list"));
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223 end
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224 -- we write data even when we are deleting because lua doesn't have a
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225 -- platform independent way of checking for non-exisitng files
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226 return true;
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227 end
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228
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229 function list_load(username, host, datastore)
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230 local items = {};
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231 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
247
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232 if not data then
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233 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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234 if not mode then
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235 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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236 return nil;
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237 else -- file exists, but can't be read
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238 -- TODO more detailed error checking and logging?
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239 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
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240 return nil, "Error reading storage";
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241 end
247
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242 end
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243
247
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diff changeset
244 local success, ret = pcall(data);
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
245 if not success then
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4452
diff changeset
246 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
3723
72a917d910a4 util.datamanager: Return an error string when pcall fails on a loaded list file.
Waqas Hussain <waqas20@gmail.com>
parents: 3722
diff changeset
247 return nil, "Error reading storage";
247
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Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
248 end
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parents: 206
diff changeset
249 return items;
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
250 end
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
251
5032
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
252 function list_stores(username, host)
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
253 if not host then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
254 return nil, "bad argument #2 to 'list_stores' (string expected, got nothing)";
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
255 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
256 local list = {};
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
257 local host_dir = format("%s/%s/", data_path, encode(host));
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
258 for node in lfs.dir(host_dir) do
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
259 if not node:match"^%." then -- dots should be encoded, this is probably . or ..
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
260 local store = decode(node);
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
261 local path = host_dir..node;
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
262 if username == true then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
263 if lfs.attributes(path, "mode") == "directory" then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
264 list[#list+1] = store;
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
265 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
266 elseif username then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
267 if lfs.attributes(getpath(username, host, store), "mode")
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
268 or lfs.attributes(getpath(username, host, store, "list"), "mode") then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
269 list[#list+1] = store;
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
270 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
271 elseif lfs.attributes(path, "mode") == "file" then
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
272 list[#list+1] = store:gsub("%.[dalist]+$","");
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
273 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
274 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
275 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
276 return list;
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
277 end
c40ea227f8af util.datamanager: Add function for listing stores
Kim Alvefur <zash@zash.se>
parents: 5024
diff changeset
278
5038
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
279 function purge(username, host)
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
280 local host_dir = format("%s/%s/", data_path, encode(host));
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
281 local deleted = 0;
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
282 for file in lfs.dir(host_dir) do
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
283 if lfs.attributes(host_dir..file, "mode") == "directory" then
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
284 local store = decode(file);
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
285 deleted = deleted + (os_remove(getpath(username, host, store)) and 1 or 0);
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
286 deleted = deleted + (os_remove(getpath(username, host, store, "list")) and 1 or 0);
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
287 -- We this will generate loads of "No such file or directory", but do we care?
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
288 end
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
289 end
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
290 return deleted > 0, deleted;
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
291 end
242c62ff8e77 util.datamanager: Add function for removing all data belonging to a user
Kim Alvefur <zash@zash.se>
parents: 5032
diff changeset
292
247
681b29aa134f Added support for storing (and removing), loading and appending to lists of data to datamanager (for supporting offline messages)
Waqas Hussain <waqas20@gmail.com>
parents: 206
diff changeset
293 return _M;