prosody
85b2689dbcfe
util/datamanager.lua

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util/datamanager.lua @ 5021:85b2689dbcfe

Eliminate direct setfenv usage
author Florian Zeitz <florob@babelmonkeys.de>
date Fri, 08 Jun 2012 05:04:38 +0200
parent 4452:7de17ca4de14
child 5024:d25e1b9332cc
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 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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25 local lfs = require "lfs";
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26 local prosody = prosody;
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27 local raw_mkdir;
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28
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29 if prosody.platform == "posix" then
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30 raw_mkdir = require "util.pposix".mkdir; -- Doesn't trample on umask
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31 else
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32 raw_mkdir = lfs.mkdir;
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33 end
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34
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35 module "datamanager"
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36
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37 ---- utils -----
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38 local encode, decode;
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39 do
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40 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
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41
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42 decode = function (s)
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43 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
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44 end
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45
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46 encode = function (s)
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47 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end));
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48 end
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49 end
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50
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51 local _mkdir = {};
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52 local function mkdir(path)
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53 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here
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54 if not _mkdir[path] then
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55 raw_mkdir(path);
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56 _mkdir[path] = true;
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57 end
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58 return path;
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59 end
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60
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61 local data_path = (prosody and prosody.paths and prosody.paths.data) or ".";
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62 local callbacks = {};
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63
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64 ------- API -------------
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65
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66 function set_data_path(path)
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67 log("debug", "Setting data path to: %s", path);
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68 data_path = path;
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69 end
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70
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71 local function callback(username, host, datastore, data)
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72 for _, f in ipairs(callbacks) do
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73 username, host, datastore, data = f(username, host, datastore, data);
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74 if username == false then break; end
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75 end
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76
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77 return username, host, datastore, data;
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78 end
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79 function add_callback(func)
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80 if not callbacks[func] then -- Would you really want to set the same callback more than once?
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81 callbacks[func] = true;
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82 callbacks[#callbacks+1] = func;
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83 return true;
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84 end
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85 end
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86 function remove_callback(func)
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87 if callbacks[func] then
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88 for i, f in ipairs(callbacks) do
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89 if f == func then
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90 callbacks[i] = nil;
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91 callbacks[f] = nil;
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92 return true;
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93 end
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94 end
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95 end
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96 end
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97
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98 function getpath(username, host, datastore, ext, create)
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99 ext = ext or "dat";
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100 host = (host and encode(host)) or "_global";
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101 username = username and encode(username);
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102 if username then
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103 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end
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104 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext);
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105 elseif host then
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106 if create then mkdir(mkdir(data_path).."/"..host); end
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107 return format("%s/%s/%s.%s", data_path, host, datastore, ext);
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108 else
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109 if create then mkdir(data_path); end
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110 return format("%s/%s.%s", data_path, datastore, ext);
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111 end
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112 end
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113
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114 function load(username, host, datastore)
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115 local data, ret = envloadfile(getpath(username, host, datastore), {});
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116 if not data then
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117 local mode = lfs.attributes(getpath(username, host, datastore), "mode");
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118 if not mode then
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119 log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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120 return nil;
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121 else -- file exists, but can't be read
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122 -- TODO more detailed error checking and logging?
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123 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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124 return nil, "Error reading storage";
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125 end
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126 end
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127
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128 local success, ret = pcall(data);
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129 if not success then
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130 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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131 return nil, "Error reading storage";
117
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132 end
0
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133 return ret;
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134 end
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135
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136 function store(username, host, datastore, data)
206
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137 if not data then
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138 data = {};
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139 end
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140
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141 username, host, datastore, data = callback(username, host, datastore, data);
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142 if username == false then
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143 return true; -- Don't save this data at all
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144 end
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145
206
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146 -- save the datastore
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147 local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
117
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148 if not f then
182
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149 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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150 return nil, "Error saving to storage";
117
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151 end
0
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152 f:write("return ");
550
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153 append(f, data);
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154 f:close();
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155 if next(data) == nil then -- try to delete empty datastore
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156 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
206
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157 os_remove(getpath(username, host, datastore));
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158 end
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159 -- we write data even when we are deleting because lua doesn't have a
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160 -- platform independent way of checking for non-exisitng files
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161 return true;
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162 end
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163
247
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164 function list_append(username, host, datastore, data)
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165 if not data then return; end
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166 if callback(username, host, datastore) == false then return true; end
247
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167 -- save the datastore
643
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168 local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
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169 if not f then
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170 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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171 return;
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172 end
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173 f:write("item(");
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174 append(f, data);
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175 f:write(");\n");
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176 f:close();
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177 return true;
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178 end
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179
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180 function list_store(username, host, datastore, data)
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181 if not data then
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182 data = {};
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183 end
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184 if callback(username, host, datastore) == false then return true; end
247
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185 -- save the datastore
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186 local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
247
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187 if not f then
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188 log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
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189 return;
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190 end
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191 for _, d in ipairs(data) do
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192 f:write("item(");
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193 append(f, d);
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194 f:write(");\n");
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195 end
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196 f:close();
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parents: 896
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197 if next(data) == nil then -- try to delete empty datastore
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198 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil");
247
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199 os_remove(getpath(username, host, datastore, "list"));
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200 end
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201 -- we write data even when we are deleting because lua doesn't have a
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202 -- platform independent way of checking for non-exisitng files
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203 return true;
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204 end
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diff changeset
205
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206 function list_load(username, host, datastore)
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207 local items = {};
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208 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end});
247
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209 if not data then
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210 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
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211 if not mode then
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212 log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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213 return nil;
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214 else -- file exists, but can't be read
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215 -- TODO more detailed error checking and logging?
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216 log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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217 return nil, "Error reading storage";
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218 end
247
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219 end
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220
247
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diff changeset
221 local success, ret = pcall(data);
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diff changeset
222 if not success then
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diff changeset
223 log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
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parents: 3722
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224 return nil, "Error reading storage";
247
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diff changeset
225 end
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diff changeset
226 return items;
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227 end
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parents: 206
diff changeset
228
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diff changeset
229 return _M;