prosody
980ded4c60ef
core/modulemanager.lua

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core/modulemanager.lua @ 591:980ded4c60ef

Removed unused variables
author Waqas Hussain <waqas20@gmail.com>
date Sun, 07 Dec 2008 03:14:30 +0500
parent 590:54afe37cccbf
child 592:c6e2c727d0cc
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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 stanza_handlers = multitable_new();
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50 local handler_info = {};
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51
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52 local modulehelpers = setmetatable({}, { __index = _G });
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53
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54 -- Load modules when a host is activated
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55 function load_modules_for_host(host)
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56 local modules_enabled = config.get(host, "core", "modules_enabled");
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57 if modules_enabled then
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58 for _, module in pairs(modules_enabled) do
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59 load(host, module);
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60 end
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61 end
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62 end
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63 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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64 --
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65
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66 function load(host, module_name, config)
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67 if not (host and module_name) then
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68 return nil, "insufficient-parameters";
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69 end
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70 local mod, err = loadfile(plugin_dir.."mod_"..module_name..".lua");
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71 if not mod then
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72 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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73 return nil, err;
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74 end
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75
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76 if not modulemap[host] then
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77 modulemap[host] = {};
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78 elseif modulemap[host][module_name] then
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79 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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80 return nil, "module-already-loaded";
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81 end
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82
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83 local _log = logger.init(host..":"..module_name);
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84 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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85
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86 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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87
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88 setfenv(mod, pluginenv);
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89
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90 local success, ret = pcall(mod);
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91 if not success then
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92 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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93 return nil, ret;
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94 end
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95
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96 modulemap[host][module_name] = mod;
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97
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98 return true;
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99 end
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100
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101 function is_loaded(host, name)
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102 return modulemap[host] and modulemap[host][name] and true;
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103 end
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104
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105 function unload(host, name, ...)
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106 local mod = modulemap[host] and modulemap[host][name];
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107 if not mod then return nil, "module-not-loaded"; end
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108
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109 if type(mod.unload) == "function" then
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110 local ok, err = pcall(mod.unload, ...)
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111 if (not ok) and err then
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112 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err);
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113 end
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114 end
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115
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116 end
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117
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118 function handle_stanza(host, origin, stanza)
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119 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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120 if name == "iq" and xmlns == "jabber:client" then
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121 xmlns = stanza.tags[1].attr.xmlns;
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122 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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123 end
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124 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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125 if handlers then
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126 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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127 (handlers[1])(origin, stanza);
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128 return true;
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129 else
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130 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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131 end
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132 end
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133
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134 ----- API functions exposed to modules -----------
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135 -- Must all be in api.*
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136
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137 -- Returns the name of the current module
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138 function api:get_name()
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139 return self.name;
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140 end
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141
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142 -- Returns the host that the current module is serving
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143 function api:get_host()
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144 return self.host;
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145 end
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146
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147 local function _add_handler(module, origin_type, tag, xmlns, handler)
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148 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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149 local msg = (tag == "iq") and "namespace" or "payload namespace";
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150 if not handlers then
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151 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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152 handler_info[handler] = module;
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153 module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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154 else
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155 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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156 end
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157 end
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158
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159 function api:add_handler(origin_type, tag, xmlns, handler)
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160 if not (origin_type and tag and xmlns and handler) then return false; end
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161 if type(origin_type) == "table" then
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162 for _, origin_type in ipairs(origin_type) do
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163 _add_handler(self, origin_type, tag, xmlns, handler);
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164 end
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165 else
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166 _add_handler(self, origin_type, tag, xmlns, handler);
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167 end
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168 end
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169 function api:add_iq_handler(origin_type, xmlns, handler)
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170 self:add_handler(origin_type, "iq", xmlns, handler);
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171 end
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172
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173 function api:add_feature(xmlns)
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174 addDiscoInfoHandler(self.host, function(reply, to, from, node)
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175 if #node == 0 then
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176 reply:tag("feature", {var = xmlns}):up();
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177 return true;
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178 end
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179 end);
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180 end
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181
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182 function api:add_event_hook (...) return eventmanager.add_event_hook(...); end
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183
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184 --------------------------------------------------------------------
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185
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186 return _M;