prosody
ec03f6968fa8
core/modulemanager.lua

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core/modulemanager.lua @ 540:ec03f6968fa8

Added function add_feature to modules API (for adding disco features)
author Waqas Hussain <waqas20@gmail.com>
date Thu, 04 Dec 2008 20:07:22 +0500
parent 519:cccd610a0ef9
child 569:5216efe6088b
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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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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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28 local loadfile, pcall = loadfile, pcall;
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29 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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30 local pairs, ipairs = pairs, ipairs;
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31 local t_insert = table.insert;
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32 local type = type;
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33
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34 local tostring, print = tostring, print;
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36 -- We need this to let modules access the real global namespace
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37 local _G = _G;
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38
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39 module "modulemanager"
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41 local api = {}; -- Module API container
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42
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43 local modulemap = {};
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44
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45 local handler_info = {};
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46 local stanza_handlers = {};
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48 local modulehelpers = setmetatable({}, { __index = _G });
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51 function load(host, module_name, config)
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52 if not (host and module_name) then
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53 return nil, "insufficient-parameters";
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54 end
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55 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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56 if not mod then
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57 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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58 return nil, err;
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59 end
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61 if not modulemap[host] then
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62 modulemap[host] = {};
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63 stanza_handlers[host] = {};
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64 elseif modulemap[host][module_name] then
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65 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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66 return nil, "module-already-loaded";
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67 end
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69 local _log = logger.init(host..":"..module_name);
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70 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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71
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72 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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74 setfenv(mod, pluginenv);
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75
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76 local success, ret = pcall(mod);
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77 if not success then
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78 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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79 return nil, ret;
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80 end
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81
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82 modulemap[host][module_name] = mod;
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83
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84 return true;
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85 end
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86
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87 function is_loaded(host, name)
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88 return modulemap[host] and modulemap[host][name] and true;
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89 end
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90
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91 function unload(host, name, ...)
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92 local mod = modulemap[host] and modulemap[host][name];
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93 if not mod then return nil, "module-not-loaded"; end
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94
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95 if type(mod.unload) == "function" then
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96 local ok, err = pcall(mod.unload, ...)
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97 if (not ok) and err then
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98 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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99 end
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100 end
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101
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102 end
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103
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104 function handle_stanza(host, origin, stanza)
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105 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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106
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107 local handlers = stanza_handlers[host];
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108 if not handlers then
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109 log("warn", "No handlers for %s", host);
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110 return false;
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111 end
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112
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113 if name == "iq" and xmlns == "jabber:client" and handlers[origin_type] then
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114 local child = stanza.tags[1];
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115 if child then
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116 local xmlns = child.attr.xmlns or xmlns;
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117 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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118 local handler = handlers[origin_type][name] and handlers[origin_type][name][xmlns];
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119 if handler then
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120 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
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121 return handler(origin, stanza) or true;
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122 end
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123 end
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124 elseif handlers[origin_type] then
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125 local handler = handlers[origin_type][name];
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126 if handler then
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127 handler = handler[xmlns];
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128 if handler then
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129 log("debug", "Passing stanza to mod_%s", handler_info[handler].name);
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130 return handler(origin, stanza) or true;
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131 end
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132 end
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133 end
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134 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns);
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135 return false; -- we didn't handle it
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136 end
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137
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138 ----- API functions exposed to modules -----------
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139 -- Must all be in api.*
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141 -- Returns the name of the current module
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142 function api:get_name()
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143 return self.name;
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144 end
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145
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146 -- Returns the host that the current module is serving
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147 function api:get_host()
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148 return self.host;
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149 end
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150
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151
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152 local function _add_iq_handler(module, origin_type, xmlns, handler)
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153 local handlers = stanza_handlers[module.host];
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154 handlers[origin_type] = handlers[origin_type] or {};
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155 handlers[origin_type].iq = handlers[origin_type].iq or {};
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156 if not handlers[origin_type].iq[xmlns] then
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157 handlers[origin_type].iq[xmlns]= handler;
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158 handler_info[handler] = module;
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159 module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns);
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160 else
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161 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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162 end
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163 end
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164
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165 function api:add_iq_handler(origin_type, xmlns, handler)
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166 if not (origin_type and handler and xmlns) then return false; end
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167 if type(origin_type) == "table" then
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168 for _, origin_type in ipairs(origin_type) do
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169 _add_iq_handler(self, origin_type, xmlns, handler);
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170 end
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171 return;
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172 end
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173 _add_iq_handler(self, origin_type, xmlns, handler);
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174 end
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175
540
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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
39
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186 do
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187 local event_handlers = {};
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188
438
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189 function api:add_event_hook(name, handler)
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190 if not event_handlers[name] then
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191 event_handlers[name] = {};
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192 end
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193 t_insert(event_handlers[name] , handler);
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194 self:log("debug", "Subscribed to %s", name);
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195 end
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196
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197 function fire_event(name, ...)
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198 local event_handlers = event_handlers[name];
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199 if event_handlers then
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200 for name, handler in ipairs(event_handlers) do
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201 handler(...);
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202 end
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203 end
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204 end
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205 end
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206
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207
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208 local function _add_handler(module, origin_type, tag, xmlns, handler)
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209 local handlers = stanza_handlers[module.host];
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210 handlers[origin_type] = handlers[origin_type] or {};
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211 if not handlers[origin_type][tag] then
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212 handlers[origin_type][tag] = handlers[origin_type][tag] or {};
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213 handlers[origin_type][tag][xmlns]= handler;
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214 handler_info[handler] = module;
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215 module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns);
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216 elseif handler_info[handlers[origin_type][tag]] then
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217 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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218 end
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219 end
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220
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221 function api:add_handler(origin_type, tag, xmlns, handler)
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222 if not (origin_type and tag and xmlns and handler) then return false; end
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223 if type(origin_type) == "table" then
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224 for _, origin_type in ipairs(origin_type) do
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225 _add_handler(self, origin_type, tag, xmlns, handler);
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226 end
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227 return;
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228 end
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229 _add_handler(self, origin_type, tag, xmlns, handler);
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230 end
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231
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232 --------------------------------------------------------------------
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233
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234 return _M;