prosody
f31fa6520a4b
core/configmanager.lua

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core/configmanager.lua @ 3573:f31fa6520a4b

configmanager: Atomic reloads, and some other internal changes to achieve this
author Matthew Wild <mwild1@gmail.com>
date Sun, 07 Nov 2010 20:38:01 +0000
parent 3515:bb494c3aa364
child 3609:954b1159f2f3
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 local _G = _G;
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10 local setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, format =
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11 setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, string.format;
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12
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13
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14 local fire_event = prosody and prosody.events.fire_event or function () end;
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15
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16 module "configmanager"
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17
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18 local parsers = {};
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19
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20 local config_mt = { __index = function (t, k) return rawget(t, "*"); end};
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21 local config = setmetatable({ ["*"] = { core = {} } }, config_mt);
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22
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23 -- When host not found, use global
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24 local host_mt = { };
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26 -- When key not found in section, check key in global's section
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27 function section_mt(section_name)
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28 return { __index = function (t, k)
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29 local section = rawget(config["*"], section_name);
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30 if not section then return nil; end
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31 return section[k];
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32 end
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33 };
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34 end
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35
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36 function getconfig()
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37 return config;
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38 end
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39
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40 function get(host, section, key)
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41 local sec = config[host][section];
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42 if sec then
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43 return sec[key];
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44 end
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45 return nil;
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46 end
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47
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48 local function set(config, host, section, key, value)
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49 if host and section and key then
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50 local hostconfig = rawget(config, host);
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51 if not hostconfig then
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52 hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];
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53 end
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54 if not rawget(hostconfig, section) then
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55 hostconfig[section] = setmetatable({}, section_mt(section));
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56 end
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57 hostconfig[section][key] = value;
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58 return true;
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59 end
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60 return false;
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61 end
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62
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63 function _M.set(host, section, key, value)
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64 return set(config, host, section, key, value);
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65 end
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66
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67 function load(filename, format)
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68 format = format or filename:match("%w+$");
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69
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70 if parsers[format] and parsers[format].load then
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71 local f, err = io.open(filename);
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72 if f then
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73 local new_config, err = parsers[format].load(f:read("*a"), filename);
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74 f:close();
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75 if new_config then
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76 setmetatable(new_config, config_mt);
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77 config = new_config;
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78 fire_event("config-reloaded", {
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79 filename = filename,
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80 format = format,
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81 config = config
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82 });
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83 end
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84 return not not new_config, "parser", err;
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85 end
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86 return f, "file", err;
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87 end
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88
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89 if not format then
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90 return nil, "file", "no parser specified";
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91 else
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92 return nil, "file", "no parser for "..(format);
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93 end
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94 end
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95
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96 function save(filename, format)
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97 end
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98
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99 function addparser(format, parser)
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100 if format and parser then
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101 parsers[format] = parser;
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102 end
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103 end
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104
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105 -- _M needed to avoid name clash with local 'parsers'
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106 function _M.parsers()
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107 local p = {};
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108 for format in pairs(parsers) do
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109 table.insert(p, format);
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110 end
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111 return p;
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112 end
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113
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114 -- Built-in Lua parser
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115 do
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116 local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;
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117 local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;
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118 parsers.lua = {};
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119 function parsers.lua.load(data, filename)
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120 local config = { ["*"] = { core = {} } };
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121
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122 local env;
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123 -- The ' = true' are needed so as not to set off __newindex when we assign the functions below
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124 env = setmetatable({
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125 Host = true, host = true, VirtualHost = true,
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126 Component = true, component = true,
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127 Include = true, include = true, RunScript = dofile }, {
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128 __index = function (t, k)
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129 return rawget(_G, k) or
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130 function (settings_table)
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131 config[__currenthost or "*"][k] = settings_table;
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132 end;
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133 end,
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134 __newindex = function (t, k, v)
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135 set(config, env.__currenthost or "*", "core", k, v);
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136 end
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137 });
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138
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139 rawset(env, "__currenthost", "*") -- Default is global
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140 function env.VirtualHost(name)
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141 if rawget(config, name) and rawget(config[name].core, "component_module") then
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142 error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
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143 name, config[name].core.component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
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144 end
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145 rawset(env, "__currenthost", name);
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146 -- Needs at least one setting to logically exist :)
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147 set(config, name or "*", "core", "defined", true);
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148 return function (config_options)
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149 rawset(env, "__currenthost", "*"); -- Return to global scope
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150 for option_name, option_value in pairs(config_options) do
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151 set(config, name or "*", "core", option_name, option_value);
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152 end
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153 end;
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154 end
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155 env.Host, env.host = env.VirtualHost, env.VirtualHost;
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156
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157 function env.Component(name)
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158 if rawget(config, name) and rawget(config[name].core, "defined") and not rawget(config[name].core, "component_module") then
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159 error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
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160 name, name, name), 0);
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161 end
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162 set(config, name, "core", "component_module", "component");
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163 -- Don't load the global modules by default
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164 set(config, name, "core", "load_global_modules", false);
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165 rawset(env, "__currenthost", name);
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166 local function handle_config_options(config_options)
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167 rawset(env, "__currenthost", "*"); -- Return to global scope
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168 for option_name, option_value in pairs(config_options) do
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169 set(config, name or "*", "core", option_name, option_value);
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170 end
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171 end
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172
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173 return function (module)
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174 if type(module) == "string" then
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175 set(config, name, "core", "component_module", module);
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176 return handle_config_options;
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177 end
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178 return handle_config_options(module);
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179 end
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180 end
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181 env.component = env.Component;
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182
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183 function env.Include(file)
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184 local f, err = io.open(file);
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185 if f then
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186 local data = f:read("*a");
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187 local ok, err = parsers.lua.load(data, file);
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188 if not ok then error(err:gsub("%[string.-%]", file), 0); end
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189 end
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190 if not f then error("Error loading included "..file..": "..err, 0); end
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191 return f, err;
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192 end
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193 env.include = env.Include;
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194
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195 local chunk, err = loadstring(data, "@"..filename);
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196
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197 if not chunk then
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198 return nil, err;
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199 end
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200
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201 setfenv(chunk, env);
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202
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203 local ok, err = pcall(chunk);
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204
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205 if not ok then
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206 return nil, err;
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207 end
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208
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209 return config;
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210 end
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211
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212 end
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213
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214 return _M;