prosody
54afe37cccbf
core/modulemanager.lua

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core/modulemanager.lua @ 590:54afe37cccbf

Combined and merged similar code
author Waqas Hussain <waqas20@gmail.com>
date Sun, 07 Dec 2008 03:10:47 +0500
parent 589:d564f94d5727
child 591:980ded4c60ef
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1 -- Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 --
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19
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22 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
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23
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24 local logger = require "util.logger";
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25 local log = logger.init("modulemanager");
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26 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
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27 local eventmanager = require "core.eventmanager";
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28 local config = require "core.configmanager";
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29 local multitable_new = require "util.multitable".new;
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32 local loadfile, pcall = loadfile, pcall;
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33 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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34 local pairs, ipairs = pairs, ipairs;
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35 local t_insert = table.insert;
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36 local type = type;
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37
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38 local tostring, print = tostring, print;
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39
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40 -- We need this to let modules access the real global namespace
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41 local _G = _G;
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42
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43 module "modulemanager"
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44
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45 local api = {}; -- Module API container
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46
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47 local modulemap = {};
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48
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49 local m_handler_info = multitable_new();
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50 local m_stanza_handlers = multitable_new();
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51 local handler_info = {};
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52 local stanza_handlers = {};
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53
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54 local modulehelpers = setmetatable({}, { __index = _G });
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56 -- Load modules when a host is activated
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57 function load_modules_for_host(host)
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58 local modules_enabled = config.get(host, "core", "modules_enabled");
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59 if modules_enabled then
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60 for _, module in pairs(modules_enabled) do
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61 load(host, module);
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62 end
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63 end
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64 end
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65 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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66 --
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67
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68 function load(host, module_name, config)
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69 if not (host and module_name) then
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70 return nil, "insufficient-parameters";
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71 end
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72 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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73 if not mod then
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74 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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75 return nil, err;
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76 end
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78 if not modulemap[host] then
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79 modulemap[host] = {};
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80 stanza_handlers[host] = {};
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81 elseif modulemap[host][module_name] then
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82 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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83 return nil, "module-already-loaded";
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84 end
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85
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86 local _log = logger.init(host..":"..module_name);
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87 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api });
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88
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89 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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90
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91 setfenv(mod, pluginenv);
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92
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93 local success, ret = pcall(mod);
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94 if not success then
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95 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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96 return nil, ret;
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97 end
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98
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99 modulemap[host][module_name] = mod;
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100
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101 return true;
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102 end
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103
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104 function is_loaded(host, name)
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105 return modulemap[host] and modulemap[host][name] and true;
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106 end
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107
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108 function unload(host, name, ...)
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109 local mod = modulemap[host] and modulemap[host][name];
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110 if not mod then return nil, "module-not-loaded"; end
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111
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112 if type(mod.unload) == "function" then
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113 local ok, err = pcall(mod.unload, ...)
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114 if (not ok) and err then
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115 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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116 end
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117 end
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118
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119 end
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120
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121 function handle_stanza(host, origin, stanza)
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122 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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123 if name == "iq" and xmlns == "jabber:client" then
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124 xmlns = stanza.tags[1].attr.xmlns;
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125 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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126 end
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127 local handlers = m_stanza_handlers:get(host, origin_type, name, xmlns);
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128 if handlers then
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129 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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130 (handlers[1])(origin, stanza);
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131 return true;
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132 else
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133 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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134 end
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135 end
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136
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137 ----- API functions exposed to modules -----------
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138 -- Must all be in api.*
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139
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140 -- Returns the name of the current module
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141 function api:get_name()
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142 return self.name;
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143 end
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144
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145 -- Returns the host that the current module is serving
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146 function api:get_host()
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147 return self.host;
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148 end
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149
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150 local function _add_handler(module, origin_type, tag, xmlns, handler)
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151 local handlers = m_stanza_handlers:get(module.host, origin_type, tag, xmlns);
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152 local msg = (tag == "iq") and "namespace" or "payload namespace";
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153 if not handlers then
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154 m_stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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155 handler_info[handler] = module;
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156 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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157 else
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158 module:log("warn", "I wanted to handle tag '%s' [%s] with %s '%s' but mod_%s already handles that", tag, origin_type, msg, xmlns, handler_info[handlers[1]].module.name);
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159 end
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160 end
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161
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162 function api:add_handler(origin_type, tag, xmlns, handler)
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163 if not (origin_type and tag and xmlns and handler) then return false; end
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164 if type(origin_type) == "table" then
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165 for _, origin_type in ipairs(origin_type) do
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166 _add_handler(self, origin_type, tag, xmlns, handler);
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167 end
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168 else
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169 _add_handler(self, origin_type, tag, xmlns, handler);
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170 end
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171 end
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172 function api:add_iq_handler(origin_type, xmlns, handler)
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173 self:add_handler(origin_type, "iq", xmlns, handler);
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174 end
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175
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176 function api:add_feature(xmlns)
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177 addDiscoInfoHandler(self.host, function(reply, to, from, node)
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178 if #node == 0 then
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179 reply:tag("feature", {var = xmlns}):up();
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180 return true;
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181 end
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182 end);
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183 end
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184
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185 function api:add_event_hook (...) return eventmanager.add_event_hook(...); end
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186
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187 --------------------------------------------------------------------
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188
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189 return _M;