prosody
cccd610a0ef9
core/modulemanager.lua

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core/modulemanager.lua @ 519:cccd610a0ef9

Insert copyright/license headers
author Matthew Wild <mwild1@gmail.com>
date Wed, 03 Dec 2008 14:39:07 +0000
parent 467:66f145f5c932
child 540:ec03f6968fa8
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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
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27 local loadfile, pcall = loadfile, pcall;
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28 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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29 local pairs, ipairs = pairs, ipairs;
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30 local t_insert = table.insert;
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31 local type = type;
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32
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33 local tostring, print = tostring, print;
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34
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35 -- We need this to let modules access the real global namespace
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36 local _G = _G;
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37
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38 module "modulemanager"
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39
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40 local api = {}; -- Module API container
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41
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42 local modulemap = {};
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43
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44 local handler_info = {};
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45 local stanza_handlers = {};
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46
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47 local modulehelpers = setmetatable({}, { __index = _G });
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48
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49
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50 function load(host, module_name, config)
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51 if not (host and module_name) then
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52 return nil, "insufficient-parameters";
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53 end
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54 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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55 if not mod then
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56 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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57 return nil, err;
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58 end
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60 if not modulemap[host] then
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61 modulemap[host] = {};
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62 stanza_handlers[host] = {};
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63 elseif modulemap[host][module_name] then
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64 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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65 return nil, "module-already-loaded";
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66 end
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67
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68 local _log = logger.init(host..":"..module_name);
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69 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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70
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71 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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72
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73 setfenv(mod, pluginenv);
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74
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75 local success, ret = pcall(mod);
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76 if not success then
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77 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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78 return nil, ret;
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79 end
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80
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81 modulemap[host][module_name] = mod;
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82
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83 return true;
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84 end
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85
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86 function is_loaded(host, name)
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87 return modulemap[host] and modulemap[host][name] and true;
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88 end
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89
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90 function unload(host, name, ...)
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91 local mod = modulemap[host] and modulemap[host][name];
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92 if not mod then return nil, "module-not-loaded"; end
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93
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94 if type(mod.unload) == "function" then
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95 local ok, err = pcall(mod.unload, ...)
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96 if (not ok) and err then
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97 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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98 end
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99 end
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100
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101 end
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102
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103 function handle_stanza(host, origin, stanza)
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104 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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105
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106 local handlers = stanza_handlers[host];
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107 if not handlers then
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108 log("warn", "No handlers for %s", host);
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109 return false;
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110 end
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111
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112 if name == "iq" and xmlns == "jabber:client" and handlers[origin_type] then
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113 local child = stanza.tags[1];
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114 if child then
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115 local xmlns = child.attr.xmlns or xmlns;
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116 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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117 local handler = handlers[origin_type][name] and handlers[origin_type][name][xmlns];
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118 if handler then
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119 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
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120 return handler(origin, stanza) or true;
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121 end
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122 end
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123 elseif handlers[origin_type] then
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124 local handler = handlers[origin_type][name];
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125 if handler then
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126 handler = handler[xmlns];
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127 if handler then
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128 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
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129 return handler(origin, stanza) or true;
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130 end
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131 end
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132 end
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133 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns);
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134 return false; -- we didn't handle it
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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
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151 local function _add_iq_handler(module, origin_type, xmlns, handler)
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152 local handlers = stanza_handlers[module.host];
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153 handlers[origin_type] = handlers[origin_type] or {};
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154 handlers[origin_type].iq = handlers[origin_type].iq or {};
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155 if not handlers[origin_type].iq[xmlns] then
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156 handlers[origin_type].iq[xmlns]= handler;
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157 handler_info[handler] = module;
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158 module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns);
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159 else
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160 module:log("warn", "I wanted to handle tag 'iq' [%s] with payload namespace '%s' but mod_%s already handles that", origin_type, xmlns, handler_info[handlers[origin_type].iq[xmlns]].name);
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161 end
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162 end
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163
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164 function api:add_iq_handler(origin_type, xmlns, handler)
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165 if not (origin_type and handler and xmlns) then return false; end
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166 if type(origin_type) == "table" then
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167 for _, origin_type in ipairs(origin_type) do
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168 _add_iq_handler(self, origin_type, xmlns, handler);
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169 end
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170 return;
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171 end
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172 _add_iq_handler(self, origin_type, xmlns, handler);
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173 end
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174
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175
39
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176 do
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177 local event_handlers = {};
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178
438
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179 function api:add_event_hook(name, handler)
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180 if not event_handlers[name] then
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181 event_handlers[name] = {};
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182 end
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183 t_insert(event_handlers[name] , handler);
438
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184 self:log("debug", "Subscribed to %s", name);
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185 end
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186
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187 function fire_event(name, ...)
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188 local event_handlers = event_handlers[name];
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189 if event_handlers then
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190 for name, handler in ipairs(event_handlers) do
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191 handler(...);
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192 end
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193 end
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194 end
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195 end
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196
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197
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198 local function _add_handler(module, origin_type, tag, xmlns, handler)
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199 local handlers = stanza_handlers[module.host];
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200 handlers[origin_type] = handlers[origin_type] or {};
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201 if not handlers[origin_type][tag] then
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202 handlers[origin_type][tag] = handlers[origin_type][tag] or {};
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203 handlers[origin_type][tag][xmlns]= handler;
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204 handler_info[handler] = module;
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205 module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns);
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206 elseif handler_info[handlers[origin_type][tag]] then
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207 log("warning", "I wanted to handle tag '%s' [%s] but mod_%s already handles that", tag, origin_type, handler_info[handlers[origin_type][tag]].module.name);
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208 end
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209 end
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210
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211 function api:add_handler(origin_type, tag, xmlns, handler)
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212 if not (origin_type and tag and xmlns and handler) then return false; end
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213 if type(origin_type) == "table" then
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214 for _, origin_type in ipairs(origin_type) do
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215 _add_handler(self, origin_type, tag, xmlns, handler);
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216 end
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217 return;
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218 end
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219 _add_handler(self, origin_type, tag, xmlns, handler);
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220 end
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221
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222 --------------------------------------------------------------------
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223
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224 return _M;