prosody
7db1044d2fab
core/modulemanager.lua

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core/modulemanager.lua @ 672:7db1044d2fab

Remove warning of already-loaded modules at startup
author Matthew Wild <mwild1@gmail.com>
date Sun, 04 Jan 2009 02:55:59 +0000
parent 670:d5cf10b7fc44
child 675:cc82394fea22
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1 -- Prosody IM v0.2
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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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20
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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 local next = next;
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39 local tostring, print = tostring, print;
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40
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41 -- We need this to let modules access the real global namespace
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42 local _G = _G;
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43
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44 module "modulemanager"
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45
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46 local api = {}; -- Module API container
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47
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48 local modulemap = { ["*"] = {} };
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49
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50 local stanza_handlers = multitable_new();
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51 local handler_info = {};
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52
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53 local modulehelpers = setmetatable({}, { __index = _G });
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54
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55 local features_table = multitable_new();
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56 local handler_table = multitable_new();
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57 local NULL = {};
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58
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59 -- Load modules when a host is activated
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60 function load_modules_for_host(host)
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61 -- Load modules from global section
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62 local modules_enabled = config.get("*", "core", "modules_enabled");
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63 local modules_disabled = config.get(host, "core", "modules_disabled");
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64 local disabled_set = {};
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65 if modules_enabled then
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66 if modules_disabled then
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67 for _, module in pairs(modules_disabled) do
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68 disabled_set[module] = true;
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69 end
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70 end
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71 for _, module in pairs(modules_enabled) do
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72 if not disabled_set[module] then
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73 load(host, module);
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74 end
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75 end
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76 end
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77
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78 -- Load modules from just this host
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79 local modules_enabled = config.get(host, "core", "modules_enabled");
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80 if modules_enabled then
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81 for _, module in pairs(modules_enabled) do
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82 if not is_loaded(host, module) then
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83 load(host, module);
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84 end
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85 end
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86 end
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87 end
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88 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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89 --
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91 function load(host, module_name, config)
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92 if not (host and module_name) then
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93 return nil, "insufficient-parameters";
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94 end
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95
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96 if not modulemap[host] then
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97 modulemap[host] = {};
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98 elseif modulemap[host][module_name] then
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99 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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100 return nil, "module-already-loaded";
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101 elseif modulemap["*"][module_name] then
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102 return nil, "global-module-already-loaded";
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103 end
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104
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105
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106 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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107 if not mod then
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108 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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109 return nil, err;
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110 end
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111
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112 local _log = logger.init(host..":"..module_name);
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113 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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114
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115 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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116
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117 setfenv(mod, pluginenv);
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118
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119 local success, ret = pcall(mod);
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120 if not success then
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121 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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122 return nil, ret;
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123 end
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124
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125 -- Use modified host, if the module set one
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126 modulemap[api_instance.host][module_name] = pluginenv;
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127
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128 return true;
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129 end
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130
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131 function is_loaded(host, name)
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132 return modulemap[host] and modulemap[host][name] and true;
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133 end
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134
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135 function unload(host, name, ...)
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136 local mod = modulemap[host] and modulemap[host][name];
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137 if not mod then return nil, "module-not-loaded"; end
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138
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139 --[[if type(mod.unload) == "function" then
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140 local ok, err = pcall(mod.unload, ...)
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141 if (not ok) and err then
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142 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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143 end
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144 end]]
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145 modulemap[host][name] = nil;
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146 features_table:remove(host, name);
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147 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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148 for _, param in pairs(params) do
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149 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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150 handler_info[handlers[1]] = nil;
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151 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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152 end
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153 return true;
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154 end
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155
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156 function handle_stanza(host, origin, stanza)
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157 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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158 if name == "iq" and xmlns == "jabber:client" then
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159 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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160 xmlns = stanza.tags[1].attr.xmlns;
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161 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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162 else
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163 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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164 return true;
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165 end
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166 end
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167 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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168 if handlers then
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169 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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170 (handlers[1])(origin, stanza);
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171 return true;
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172 else
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173 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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174 end
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175 end
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176
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177 ----- API functions exposed to modules -----------
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178 -- Must all be in api.*
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179
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180 -- Returns the name of the current module
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181 function api:get_name()
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182 return self.name;
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183 end
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184
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185 -- Returns the host that the current module is serving
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186 function api:get_host()
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187 return self.host;
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188 end
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189
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190 local function _add_handler(module, origin_type, tag, xmlns, handler)
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191 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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192 local msg = (tag == "iq") and "namespace" or "payload namespace";
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193 if not handlers then
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194 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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195 handler_info[handler] = module;
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196 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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197 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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198 else
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199 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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200 end
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201 end
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202
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203 function api:add_handler(origin_type, tag, xmlns, handler)
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204 if not (origin_type and tag and xmlns and handler) then return false; end
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205 if type(origin_type) == "table" then
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206 for _, origin_type in ipairs(origin_type) do
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207 _add_handler(self, origin_type, tag, xmlns, handler);
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208 end
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209 else
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210 _add_handler(self, origin_type, tag, xmlns, handler);
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211 end
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212 end
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213 function api:add_iq_handler(origin_type, xmlns, handler)
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214 self:add_handler(origin_type, "iq", xmlns, handler);
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215 end
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216
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217 addDiscoInfoHandler("*host", function(reply, to, from, node)
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218 if #node == 0 then
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219 local done = {};
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220 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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221 for feature in pairs(features) do
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222 if not done[feature] then
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223 reply:tag("feature", {var = feature}):up(); -- TODO cache
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224 done[feature] = true;
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225 end
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226 end
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227 end
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228 return next(done) ~= nil;
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229 end
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230 end);
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231
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232 function api:add_feature(xmlns)
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233 features_table:set(self.host, self.name, xmlns, true);
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234 end
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235
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236 function api:add_event_hook (...) return eventmanager.add_event_hook(...); end
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237
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238 --------------------------------------------------------------------
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239
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240 return _M;