prosody
5a343599cd3e
core/modulemanager.lua

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core/modulemanager.lua @ 745:5a343599cd3e

core.modulemanager: Some refactoring to make upcoming changes a little easier
author Matthew Wild <mwild1@gmail.com>
date Sat, 24 Jan 2009 01:15:40 +0000
parent 733:b1aedec00661
child 746:7027de4c039d
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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, t_concat = table.insert, table.concat;
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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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39
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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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94
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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(get_module_filename(module_name));
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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 get_module(host, name)
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136 return modulemap[host] and modulemap[host][name];
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137 end
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138
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139 function is_loaded(host, name)
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140 return modulemap[host] and modulemap[host][name] and true;
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141 end
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142
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143 function unload(host, name, ...)
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144 local mod = get_module(host, name);
439
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145 if not mod then return nil, "module-not-loaded"; end
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146
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147 if module_has_method(mod, "unload") then
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148 local ok, err = call_module_method(mod, "unload");
439
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149 if (not ok) and err then
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150 log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err);
439
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151 end
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152 end
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153 modulemap[host][name] = nil;
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154 features_table:remove(host, name);
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155 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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156 for _, param in pairs(params or NULL) do
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157 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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158 if handlers then
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159 handler_info[handlers[1]] = nil;
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160 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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161 end
439
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162 end
686
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163 event_hooks:remove(host, name);
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164 return true;
439
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165 end
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166
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167 function reload(host, name, ...)
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168 local mod = get_module(host, name);
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169 if not mod then return nil, "module-not-loaded"; end
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170
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171 local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors
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172 if not _mod then
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173 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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174 return nil, err;
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175 end
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176
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177 local saved;
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178
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179 if module_has_method(mod, "save") then
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180 local ok, ret, err = call_module_method(mod, "save");
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181 if ok then
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182 saved = ret;
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183 else
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184 log("warn", "Error saving module '%s:%s' state: %s", host, module, ret);
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185 if not config.get(host, "core", "force_module_reload") then
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186 log("warn", "Aborting reload due to error, set force_module_reload to ignore this");
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187 return nil, "save-state-failed";
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188 else
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189 log("warn", "Continuing with reload (using the force)");
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190 end
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191 end
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192 end
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193
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194 unload(host, name, ...);
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195 local ok, err = load(host, name, ...);
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196 if ok then
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197 mod = get_module(host, name);
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198 if module_has_method(mod, "restore") then
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199 local ok, err = call_module_method(mod, "restore", saved or {})
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200 if (not ok) and err then
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201 log("warn", "Error restoring module '%s' from '%s': %s", name, host, err);
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202 end
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203 end
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204 return true;
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205 end
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206 return ok, err;
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207 end
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208
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209 function handle_stanza(host, origin, stanza)
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210 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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diff changeset
211 if name == "iq" and xmlns == "jabber:client" then
608
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212 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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213 xmlns = stanza.tags[1].attr.xmlns;
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214 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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215 else
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216 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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217 return true;
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218 end
578
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219 end
591
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220 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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221 if handlers then
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222 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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diff changeset
223 (handlers[1])(origin, stanza);
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224 return true;
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225 else
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diff changeset
226 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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227 end
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228 end
39
89877d61ac51 Add support for arbitrary events and event hooks
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diff changeset
229
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diff changeset
230 function module_has_method(module, method)
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diff changeset
231 return type(module.module[method]) == "function";
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232 end
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233
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diff changeset
234 function call_module_method(module, func, ...)
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235 local f = module.module[func];
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236 if module_has_method(module, method) then
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237 return pcall(f, ...);
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diff changeset
238 else
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diff changeset
239 return false, "no-such-method";
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240 end
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diff changeset
241 end
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242
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diff changeset
243 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
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diff changeset
244 function get_module_filename(name)
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245 _modulepath[3] = name;
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246 return t_concat(_modulepath);
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diff changeset
247 end
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diff changeset
248
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diff changeset
249 ----- API functions exposed to modules -----------
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diff changeset
250 -- Must all be in api.*
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diff changeset
251
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diff changeset
252 -- Returns the name of the current module
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diff changeset
253 function api:get_name()
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diff changeset
254 return self.name;
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diff changeset
255 end
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diff changeset
256
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diff changeset
257 -- Returns the host that the current module is serving
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diff changeset
258 function api:get_host()
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diff changeset
259 return self.host;
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diff changeset
260 end
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diff changeset
261
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54afe37cccbf Combined and merged similar code
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diff changeset
262 local function _add_handler(module, origin_type, tag, xmlns, handler)
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diff changeset
263 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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diff changeset
264 local msg = (tag == "iq") and "namespace" or "payload namespace";
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diff changeset
265 if not handlers then
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diff changeset
266 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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diff changeset
267 handler_info[handler] = module;
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diff changeset
268 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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269 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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270 else
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271 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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272 end
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273 end
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274
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275 function api:add_handler(origin_type, tag, xmlns, handler)
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276 if not (origin_type and tag and xmlns and handler) then return false; end
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277 if type(origin_type) == "table" then
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278 for _, origin_type in ipairs(origin_type) do
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279 _add_handler(self, origin_type, tag, xmlns, handler);
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280 end
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281 else
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282 _add_handler(self, origin_type, tag, xmlns, handler);
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283 end
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284 end
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285 function api:add_iq_handler(origin_type, xmlns, handler)
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286 self:add_handler(origin_type, "iq", xmlns, handler);
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287 end
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288
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289 addDiscoInfoHandler("*host", function(reply, to, from, node)
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290 if #node == 0 then
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291 local done = {};
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292 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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293 for feature in pairs(features) do
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294 if not done[feature] then
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295 reply:tag("feature", {var = feature}):up(); -- TODO cache
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296 done[feature] = true;
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297 end
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298 end
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299 end
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300 return next(done) ~= nil;
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301 end
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302 end);
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303
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304 function api:add_feature(xmlns)
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305 features_table:set(self.host, self.name, xmlns, true);
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306 end
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307
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308 local event_hook = function(host, mod_name, event_name, ...)
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309 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
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310 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
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311 handler(...);
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312 end
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313 end;
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314 function api:add_event_hook(name, handler)
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315 if not hooked:get(self.host, self.name, name) then
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316 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
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317 hooked:set(self.host, self.name, name, true);
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318 end
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319 event_hooks:set(self.host, self.name, name, handler, true);
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320 end
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321
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322 --------------------------------------------------------------------
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323
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324 local actions = {};
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325
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326 function actions.load(params)
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327 --return true, "Module loaded ("..params.module.." on "..params.host..")";
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328 return load(params.host, params.module);
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329 end
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330
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331 function actions.unload(params)
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332 return unload(params.host, params.module);
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333 end
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334
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335 register_actions("/modules", actions);
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336
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337 return _M;