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util/datamanager.lua @ 6813:b1615fa62e59
net/server_select: addclient: Check for failure correctly; remove wrapconnection call on failure
author | daurnimator <quae@daurnimator.com> |
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date | Wed, 18 Dec 2013 17:54:31 -0500 |
parent | 6777:5de6b93d0190 |
child | 6992:0622f2820d1d |
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 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
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 |
0 | 10 local format = string.format; |
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11 local setmetatable = setmetatable; |
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12 local ipairs = ipairs; |
0 | 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"); |
0 | 16 local io_open = io.open; |
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17 local os_remove = os.remove; |
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18 local os_rename = os.rename; |
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19 local tonumber = tonumber; |
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20 local next = next; |
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21 local t_insert = table.insert; |
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22 local t_concat = table.concat; |
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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 |
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29 local raw_mkdir = lfs.mkdir; |
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30 local function fallocate(f, offset, len) |
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31 -- This assumes that current position == offset |
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32 local fake_data = (" "):rep(len); |
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33 local ok, msg = f:write(fake_data); |
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34 if not ok then |
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35 return ok, msg; |
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36 end |
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37 f:seek("set", offset); |
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38 return true; |
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39 end; |
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40 pcall(function() |
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41 local pposix = require "util.pposix"; |
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42 raw_mkdir = pposix.mkdir or raw_mkdir; -- Doesn't trample on umask |
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43 fallocate = pposix.fallocate or fallocate; |
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44 end); |
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45 |
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46 local _ENV = nil; |
0 | 47 |
48 ---- utils ----- | |
49 local encode, decode; | |
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50 do |
0 | 51 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end }); |
52 | |
53 decode = function (s) | |
54 return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes)); | |
55 end | |
56 | |
57 encode = function (s) | |
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58 return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end)); |
0 | 59 end |
60 end | |
61 | |
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62 local _mkdir = {}; |
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63 local function mkdir(path) |
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64 path = path:gsub("/", path_separator); -- TODO as an optimization, do this during path creation rather than here |
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65 if not _mkdir[path] then |
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66 raw_mkdir(path); |
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67 _mkdir[path] = true; |
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68 end |
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69 return path; |
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70 end |
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71 |
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72 local data_path = (prosody and prosody.paths and prosody.paths.data) or "."; |
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73 local callbacks = {}; |
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74 |
0 | 75 ------- API ------------- |
76 | |
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77 local function set_data_path(path) |
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78 log("debug", "Setting data path to: %s", path); |
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79 data_path = path; |
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80 end |
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81 |
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82 local function callback(username, host, datastore, data) |
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83 for _, f in ipairs(callbacks) do |
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84 username, host, datastore, data = f(username, host, datastore, data); |
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85 if username == false then break; end |
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86 end |
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87 |
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88 return username, host, datastore, data; |
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89 end |
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90 local function add_callback(func) |
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91 if not callbacks[func] then -- Would you really want to set the same callback more than once? |
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92 callbacks[func] = true; |
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93 callbacks[#callbacks+1] = func; |
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94 return true; |
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95 end |
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96 end |
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97 local function remove_callback(func) |
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98 if callbacks[func] then |
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99 for i, f in ipairs(callbacks) do |
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100 if f == func then |
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101 callbacks[i] = nil; |
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102 callbacks[f] = nil; |
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103 return true; |
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104 end |
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105 end |
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106 end |
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107 end |
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108 |
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109 local function getpath(username, host, datastore, ext, create) |
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110 ext = ext or "dat"; |
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111 host = (host and encode(host)) or "_global"; |
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112 username = username and encode(username); |
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113 if username then |
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114 if create then mkdir(mkdir(mkdir(data_path).."/"..host).."/"..datastore); end |
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115 return format("%s/%s/%s/%s.%s", data_path, host, datastore, username, ext); |
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116 else |
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117 if create then mkdir(mkdir(data_path).."/"..host); end |
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118 return format("%s/%s/%s.%s", data_path, host, datastore, ext); |
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119 end |
0 | 120 end |
121 | |
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122 local function load(username, host, datastore) |
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123 local data, ret = envloadfile(getpath(username, host, datastore), {}); |
117
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124 if not data then |
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125 local mode = lfs.attributes(getpath(username, host, datastore), "mode"); |
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126 if not mode then |
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127 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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128 return nil; |
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129 else -- file exists, but can't be read |
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130 -- TODO more detailed error checking and logging? |
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131 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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132 return nil, "Error reading storage"; |
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133 end |
117
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134 end |
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135 |
0 | 136 local success, ret = pcall(data); |
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137 if not success then |
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138 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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139 return nil, "Error reading storage"; |
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140 end |
0 | 141 return ret; |
142 end | |
143 | |
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144 local function atomic_store(filename, data) |
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145 local scratch = filename.."~"; |
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146 local f, ok, msg; |
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147 repeat |
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148 f, msg = io_open(scratch, "w"); |
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149 if not f then break end |
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150 |
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151 ok, msg = f:write(data); |
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152 if not ok then break end |
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153 |
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154 ok, msg = f:close(); |
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155 if not ok then break end |
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156 |
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157 return os_rename(scratch, filename); |
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158 until false; |
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159 |
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160 -- Cleanup |
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161 if f then f:close(); end |
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162 os_remove(scratch); |
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163 return nil, msg; |
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164 end |
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165 |
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166 if prosody and prosody.platform ~= "posix" then |
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167 -- os.rename does not overwrite existing files on Windows |
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168 -- TODO We could use Transactional NTFS on Vista and above |
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169 function atomic_store(filename, data) |
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170 local f, err = io_open(filename, "w"); |
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171 if not f then return f, err; end |
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172 local ok, msg = f:write(data); |
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173 if not ok then f:close(); return ok, msg; end |
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174 return f:close(); |
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175 end |
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176 end |
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177 |
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178 local function store(username, host, datastore, data) |
206
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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 |
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183 username, host, datastore, data = callback(username, host, datastore, data); |
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184 if username == false then |
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185 return true; -- Don't save this data at all |
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186 end |
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187 |
206
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188 -- save the datastore |
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189 local d = "return " .. serialize(data) .. ";\n"; |
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190 local mkdir_cache_cleared; |
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191 repeat |
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192 local ok, msg = atomic_store(getpath(username, host, datastore, nil, true), d); |
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193 if not ok then |
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194 if not mkdir_cache_cleared then -- We may need to recreate a removed directory |
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195 _mkdir = {}; |
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196 mkdir_cache_cleared = true; |
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197 else |
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198 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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199 return nil, "Error saving to storage"; |
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200 end |
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201 end |
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202 if next(data) == nil then -- try to delete empty datastore |
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203 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil"); |
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204 os_remove(getpath(username, host, datastore)); |
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205 end |
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206 -- we write data even when we are deleting because lua doesn't have a |
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207 -- platform independent way of checking for non-exisitng files |
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208 until ok; |
0 | 209 return true; |
210 end | |
211 | |
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212 local function list_append(username, host, datastore, data) |
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213 if not data then return; end |
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214 if callback(username, host, datastore) == false then return true; end |
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215 -- save the datastore |
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216 local f, msg = io_open(getpath(username, host, datastore, "list", true), "r+"); |
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217 if not f then |
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218 f, msg = io_open(getpath(username, host, datastore, "list", true), "w"); |
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219 end |
247
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220 if not f then |
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221 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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222 return; |
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223 end |
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224 local data = "item(" .. serialize(data) .. ");\n"; |
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225 local pos = f:seek("end"); |
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226 local ok, msg = fallocate(f, pos, #data); |
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227 f:seek("set", pos); |
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228 if ok then |
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229 f:write(data); |
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230 else |
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231 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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232 return ok, msg; |
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233 end |
247
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234 f:close(); |
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235 return true; |
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236 end |
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237 |
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238 local function list_store(username, host, datastore, data) |
247
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239 if not data then |
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240 data = {}; |
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241 end |
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242 if callback(username, host, datastore) == false then return true; end |
247
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243 -- save the datastore |
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244 local d = {}; |
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245 for _, item in ipairs(data) do |
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246 d[#d+1] = "item(" .. serialize(item) .. ");\n"; |
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247 end |
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248 local ok, msg = atomic_store(getpath(username, host, datastore, "list", true), t_concat(d)); |
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249 if not ok then |
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250 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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251 return; |
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252 end |
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253 if next(data) == nil then -- try to delete empty datastore |
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254 log("debug", "Removing empty %s datastore for user %s@%s", datastore, username or "nil", host or "nil"); |
247
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255 os_remove(getpath(username, host, datastore, "list")); |
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256 end |
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257 -- we write data even when we are deleting because lua doesn't have a |
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258 -- platform independent way of checking for non-exisitng files |
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259 return true; |
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260 end |
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261 |
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262 local function list_load(username, host, datastore) |
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263 local items = {}; |
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264 local data, ret = envloadfile(getpath(username, host, datastore, "list"), {item = function(i) t_insert(items, i); end}); |
247
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265 if not data then |
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266 local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode"); |
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267 if not mode then |
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268 log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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269 return nil; |
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270 else -- file exists, but can't be read |
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271 -- TODO more detailed error checking and logging? |
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272 log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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273 return nil, "Error reading storage"; |
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274 end |
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275 end |
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276 |
247
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277 local success, ret = pcall(data); |
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278 if not success then |
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279 log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil"); |
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280 return nil, "Error reading storage"; |
247
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281 end |
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282 return items; |
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283 end |
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284 |
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285 local type_map = { |
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286 keyval = "dat"; |
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287 list = "list"; |
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288 } |
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289 |
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290 local function users(host, store, typ) |
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291 typ = type_map[typ or "keyval"]; |
5250
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util.datamanager: Don't escape the name of a store
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292 local store_dir = format("%s/%s/%s", data_path, encode(host), store); |
5153
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293 |
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294 local mode, err = lfs.attributes(store_dir, "mode"); |
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295 if not mode then |
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util.datamanager: Fix traceback due to %s in log message
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296 return function() log("debug", "%s", err or (store_dir .. " does not exist")) end |
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297 end |
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298 local next, state = lfs.dir(store_dir); |
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299 return function(state) |
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300 for node in next, state do |
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301 local file, ext = node:match("^(.*)%.([dalist]+)$"); |
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302 if file and ext == typ then |
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303 return decode(file); |
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304 end |
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305 end |
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306 end, state; |
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307 end |
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308 |
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309 local function stores(username, host, typ) |
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310 typ = type_map[typ or "keyval"]; |
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311 local store_dir = format("%s/%s/", data_path, encode(host)); |
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312 |
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313 local mode, err = lfs.attributes(store_dir, "mode"); |
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314 if not mode then |
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315 return function() log("debug", err or (store_dir .. " does not exist")) end |
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316 end |
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317 local next, state = lfs.dir(store_dir); |
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318 return function(state) |
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319 for node in next, state do |
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320 if not node:match"^%." then |
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321 if username == true then |
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322 if lfs.attributes(store_dir..node, "mode") == "directory" then |
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323 return decode(node); |
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324 end |
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325 elseif username then |
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326 local store = decode(node) |
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327 if lfs.attributes(getpath(username, host, store, typ), "mode") then |
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328 return store; |
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329 end |
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330 elseif lfs.attributes(node, "mode") == "file" then |
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331 local file, ext = node:match("^(.*)%.([dalist]+)$"); |
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332 if ext == typ then |
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333 return decode(file) |
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334 end |
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335 end |
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336 end |
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337 end |
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338 end, state; |
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339 end |
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340 |
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341 local function do_remove(path) |
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342 local ok, err = os_remove(path); |
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343 if not ok and lfs.attributes(path, "mode") then |
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344 return ok, err; |
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345 end |
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346 return true |
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347 end |
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348 |
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349 local function purge(username, host) |
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350 local host_dir = format("%s/%s/", data_path, encode(host)); |
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351 local ok, iter, state, var = pcall(lfs.dir, host_dir); |
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352 if not ok then |
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353 return ok, iter; |
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354 end |
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355 local errs = {}; |
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356 for file in iter, state, var do |
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357 if lfs.attributes(host_dir..file, "mode") == "directory" then |
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358 local store = decode(file); |
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359 local ok, err = do_remove(getpath(username, host, store)); |
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360 if not ok then errs[#errs+1] = err; end |
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361 |
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362 local ok, err = do_remove(getpath(username, host, store, "list")); |
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363 if not ok then errs[#errs+1] = err; end |
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364 end |
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365 end |
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366 return #errs == 0, t_concat(errs, ", "); |
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367 end |
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368 |
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369 return { |
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370 set_data_path = set_data_path; |
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371 add_callback = add_callback; |
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372 remove_callback = remove_callback; |
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373 getpath = getpath; |
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374 load = load; |
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375 store = store; |
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376 list_append = list_append; |
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377 list_store = list_store; |
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378 list_load = list_load; |
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379 users = users; |
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380 stores = stores; |
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381 purge = purge; |
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382 path_decode = decode; |
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383 path_encode = encode; |
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384 }; |