prosody
09f0ba0cfbfc
util/datamanager.lua

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util/datamanager.lua @ 4112:09f0ba0cfbfc

util.datamanager: Change from 'Failed to load' to 'Assuming empty' for data store files that do not seem to exist
author Matthew Wild <mwild1@gmail.com>
date Tue, 11 Jan 2011 05:28:07 +0000
parent 4108:e3e3aa286334
child 4452:7de17ca4de14
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 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 prosody = prosody;
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26 local raw_mkdir;
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27
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28 if prosody.platform == "posix" then
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29 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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30 else
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31 raw_mkdir = lfs.mkdir;
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32 end
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33
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34 module "datamanager"
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35
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36 ---- utils -----
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37 local encode, decode;
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38 do
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39 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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40
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41 decode = function (s)
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42 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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43 end
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44
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45 encode = function (s)
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46 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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47 end
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48 end
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49
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50 local _mkdir = {};
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51 local function mkdir(path)
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52 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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53 if not _mkdir[path] then
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54 raw_mkdir(path);
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55 _mkdir[path] = true;
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56 end
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57 return path;
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58 end
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59
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60 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
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61 local callbacks = {};
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62
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63 ------- API -------------
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64
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65 function set_data_path(path)
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66 log("debug", "Setting data path to: %s", path);
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67 data_path = path;
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68 end
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69
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70 local function callback(username, host, datastore, data)
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71 for _, f in ipairs(callbacks) do
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72 username, host, datastore, data = f(username, host, datastore, data);
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73 if username == false then break; end
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74 end
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75
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76 return username, host, datastore, data;
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77 end
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78 function add_callback(func)
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79 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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80 callbacks[func] = true;
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81 callbacks[#callbacks+1] = func;
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82 return true;
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83 end
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84 end
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85 function remove_callback(func)
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86 if callbacks[func] then
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87 for i, f in ipairs(callbacks) do
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88 if f == func then
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89 callbacks[i] = nil;
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90 callbacks[f] = nil;
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91 return true;
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92 end
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93 end
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94 end
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95 end
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96
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97 function getpath(username, host, datastore, ext, create)
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98 ext = ext or "dat";
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99 host = (host and encode(host)) or "_global";
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100 username = username and encode(username);
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101 if username then
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102 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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103 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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104 elseif host then
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105 if create then mkdir(mkdir(data_path).."/"..host); end
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106 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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107 else
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108 if create then mkdir(data_path); end
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109 return format("%s/%s.%s", data_path, datastore, ext);
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110 end
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111 end
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112
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113 function load(username, host, datastore)
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114 local data, ret = loadfile(getpath(username, host, datastore));
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115 if not data then
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116 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
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117 if not mode then
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118 log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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119 return nil;
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120 else -- file exists, but can't be read
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121 -- TODO more detailed error checking and logging?
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122 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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123 return nil, "Error reading storage";
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124 end
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125 end
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126 setfenv(data, {});
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127 local success, ret = pcall(data);
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128 if not success then
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129 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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130 return nil, "Error reading storage";
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131 end
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132 return ret;
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133 end
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134
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135 function store(username, host, datastore, data)
206
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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
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140 username, host, datastore, data = callback(username, host, datastore, data);
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141 if username == false then
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142 return true; -- Don't save this data at all
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143 end
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144
206
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145 -- save the datastore
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146 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
117
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147 if not f then
182
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148 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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149 return nil, "Error saving to storage";
117
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150 end
0
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151 f:write("return ");
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152 append(f, data);
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153 f:close();
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154 if next(data) == nil then -- try to delete empty datastore
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155 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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156 os_remove(getpath(username, host, datastore));
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157 end
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158 -- we write data even when we are deleting because lua doesn't have a
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159 -- platform independent way of checking for non-exisitng files
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160 return true;
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161 end
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162
247
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163 function list_append(username, host, datastore, data)
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164 if not data then return; end
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165 if callback(username, host, datastore) == false then return true; end
247
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166 -- save the datastore
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167 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
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168 if not f then
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169 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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170 return;
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171 end
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172 f:write("item(");
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173 append(f, data);
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174 f:write(");\n");
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175 f:close();
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176 return true;
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177 end
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178
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179 function list_store(username, host, datastore, data)
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180 if not data then
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181 data = {};
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182 end
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183 if callback(username, host, datastore) == false then return true; end
247
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184 -- save the datastore
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185 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
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186 if not f then
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187 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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188 return;
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189 end
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190 for _, d in ipairs(data) do
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191 f:write("item(");
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192 append(f, d);
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193 f:write(");\n");
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194 end
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195 f:close();
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196 if next(data) == nil then -- try to delete empty datastore
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197 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
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198 os_remove(getpath(username, host, datastore, "list"));
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199 end
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200 -- we write data even when we are deleting because lua doesn't have a
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201 -- platform independent way of checking for non-exisitng files
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202 return true;
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203 end
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204
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205 function list_load(username, host, datastore)
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206 local data, ret = loadfile(getpath(username, host, datastore, "list"));
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207 if not data then
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208 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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209 if not mode then
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210 log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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211 return nil;
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parents: 3108
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212 else -- file exists, but can't be read
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213 -- TODO more detailed error checking and logging?
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214 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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215 return nil, "Error reading storage";
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216 end
247
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217 end
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218 local items = {};
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219 setfenv(data, {item = function(i) t_insert(items, i); end});
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220 local success, ret = pcall(data);
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221 if not success then
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parents: 206
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222 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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parents: 3844
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223 return nil, "Error reading storage";
247
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224 end
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225 return items;
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226 end
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parents: 206
diff changeset
227
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diff changeset
228 return _M;