prosody
56f6c115bc69
core/modulemanager.lua

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core/modulemanager.lua @ 710:56f6c115bc69

modulemanager: Added reload support, with callbacks for saving and restoring state
author Waqas Hussain <waqas20@gmail.com>
date Tue, 13 Jan 2009 22:37:07 +0500
parent 709:8bb83563cb21
child 713:2afd6d9e21cd
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4ae3e81513f3 0.1 -> 0.2
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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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30 local register_actions = require "core.actions".register;
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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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38 local rawget = rawget;
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40 local tostring, print = tostring, print;
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41
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42 -- We need this to let modules access the real global namespace
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43 local _G = _G;
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44
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45 module "modulemanager"
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46
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47 local api = {}; -- Module API container
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48
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49 local modulemap = { ["*"] = {} };
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50
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51 local stanza_handlers = multitable_new();
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52 local handler_info = {};
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53
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54 local modulehelpers = setmetatable({}, { __index = _G });
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55
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56 local features_table = multitable_new();
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57 local handler_table = multitable_new();
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58 local hooked = multitable_new();
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59 local event_hooks = multitable_new();
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60
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61 local NULL = {};
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62
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63 -- Load modules when a host is activated
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64 function load_modules_for_host(host)
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65 -- Load modules from global section
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66 local modules_enabled = config.get("*", "core", "modules_enabled");
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67 local modules_disabled = config.get(host, "core", "modules_disabled");
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68 local disabled_set = {};
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69 if modules_enabled then
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70 if modules_disabled then
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71 for _, module in ipairs(modules_disabled) do
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72 disabled_set[module] = true;
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73 end
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74 end
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75 for _, module in ipairs(modules_enabled) do
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76 if not disabled_set[module] then
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77 load(host, module);
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78 end
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79 end
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80 end
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81
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82 -- Load modules from just this host
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83 local modules_enabled = config.get(host, "core", "modules_enabled");
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84 if modules_enabled then
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85 for _, module in pairs(modules_enabled) do
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86 if not is_loaded(host, module) then
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87 load(host, module);
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88 end
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89 end
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90 end
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91 end
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92 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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93 --
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95 function load(host, module_name, config)
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96 if not (host and module_name) then
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97 return nil, "insufficient-parameters";
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98 end
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99
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100 if not modulemap[host] then
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101 modulemap[host] = {};
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102 elseif modulemap[host][module_name] then
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103 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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104 return nil, "module-already-loaded";
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105 elseif modulemap["*"][module_name] then
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106 return nil, "global-module-already-loaded";
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107 end
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108
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109
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110 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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111 if not mod then
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112 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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113 return nil, err;
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114 end
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115
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116 local _log = logger.init(host..":"..module_name);
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117 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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118
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119 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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120
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121 setfenv(mod, pluginenv);
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122
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123 local success, ret = pcall(mod);
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124 if not success then
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125 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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126 return nil, ret;
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127 end
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128
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129 -- Use modified host, if the module set one
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130 modulemap[api_instance.host][module_name] = pluginenv;
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131
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132 return true;
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133 end
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134
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135 function is_loaded(host, name)
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136 return modulemap[host] and modulemap[host][name] and true;
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137 end
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138
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139 function unload(host, name, ...)
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140 local mod = modulemap[host] and modulemap[host][name];
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141 if not mod then return nil, "module-not-loaded"; end
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142
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143 if type(mod.module.unload) == "function" then
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144 local ok, err = pcall(mod.module.unload, ...)
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145 if (not ok) and err then
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146 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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147 end
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148 end
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149 modulemap[host][name] = nil;
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150 features_table:remove(host, name);
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151 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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152 for _, param in pairs(params or NULL) do
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153 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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154 if handlers then
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155 handler_info[handlers[1]] = nil;
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156 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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157 end
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158 end
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159 event_hooks:remove(host, name);
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160 return true;
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161 end
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162
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163 function reload(host, name, ...)
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164 local mod = modulemap[host] and modulemap[host][name];
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165 if not mod then return nil, "module-not-loaded"; end
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166
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167 local saved;
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168 if type(mod.module.save) == "function" then
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169 local ok, err = pcall(mod.module.save)
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170 if (not ok) and err then
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171 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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172 else
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173 saved = err;
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174 end
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175 end
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176
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177 unload(host, name, ...);
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178 if load(host, name, ...) then
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179 mod = modulemap[host] and modulemap[host][name];
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180 if type(mod.module.restore) == "function" then
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181 local ok, err = pcall(mod.module.restore, saved or {})
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182 if (not ok) and err then
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183 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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184 end
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185 end
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186 return true;
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187 end
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188 end
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189
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190 function handle_stanza(host, origin, stanza)
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191 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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192 if name == "iq" and xmlns == "jabber:client" then
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193 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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194 xmlns = stanza.tags[1].attr.xmlns;
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195 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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196 else
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197 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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198 return true;
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199 end
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200 end
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201 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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202 if handlers then
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203 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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204 (handlers[1])(origin, stanza);
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205 return true;
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206 else
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207 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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208 end
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209 end
39
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210
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211 ----- API functions exposed to modules -----------
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212 -- Must all be in api.*
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213
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214 -- Returns the name of the current module
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215 function api:get_name()
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216 return self.name;
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217 end
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218
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219 -- Returns the host that the current module is serving
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220 function api:get_host()
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221 return self.host;
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222 end
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223
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224 local function _add_handler(module, origin_type, tag, xmlns, handler)
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225 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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226 local msg = (tag == "iq") and "namespace" or "payload namespace";
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227 if not handlers then
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228 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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229 handler_info[handler] = module;
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230 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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231 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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232 else
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233 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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234 end
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235 end
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236
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237 function api:add_handler(origin_type, tag, xmlns, handler)
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238 if not (origin_type and tag and xmlns and handler) then return false; end
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239 if type(origin_type) == "table" then
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240 for _, origin_type in ipairs(origin_type) do
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241 _add_handler(self, origin_type, tag, xmlns, handler);
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242 end
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243 else
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244 _add_handler(self, origin_type, tag, xmlns, handler);
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245 end
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246 end
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247 function api:add_iq_handler(origin_type, xmlns, handler)
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248 self:add_handler(origin_type, "iq", xmlns, handler);
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249 end
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250
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251 addDiscoInfoHandler("*host", function(reply, to, from, node)
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252 if #node == 0 then
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253 local done = {};
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254 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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255 for feature in pairs(features) do
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256 if not done[feature] then
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257 reply:tag("feature", {var = feature}):up(); -- TODO cache
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258 done[feature] = true;
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259 end
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260 end
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261 end
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262 return next(done) ~= nil;
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263 end
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264 end);
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265
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266 function api:add_feature(xmlns)
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267 features_table:set(self.host, self.name, xmlns, true);
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268 end
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269
686
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270 local event_hook = function(host, mod_name, event_name, ...)
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271 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
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272 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
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273 handler(...);
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274 end
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275 end;
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276 function api:add_event_hook(name, handler)
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277 if not hooked:get(self.host, self.name, name) then
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278 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
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279 hooked:set(self.host, self.name, name, true);
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280 end
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281 event_hooks:set(self.host, self.name, name, handler, true);
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282 end
438
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
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283
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
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284 --------------------------------------------------------------------
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285
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286 local actions = {};
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287
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288 function actions.load(params)
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289 --return true, "Module loaded ("..params.module.." on "..params.host..")";
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290 return load(params.host, params.module);
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291 end
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292
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293 function actions.unload(params)
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294 return unload(params.host, params.module);
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295 end
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296
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297 register_actions("/modules", actions);
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298
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299 return _M;