prosody
fad020cead52
core/modulemanager.lua

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core/modulemanager.lua @ 876:fad020cead52

Allow global modules to hook stanza handlers
author Waqas Hussain <waqas20@gmail.com>
date Wed, 04 Mar 2009 22:15:46 +0500
parent 778:0d94b4903cc7
child 878:72a7eeaa9e58
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rev   line source
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5cccfb5da6cb 0.2->0.3
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1 -- Prosody IM v0.3
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90ce865eebd8 Update copyright notices for 2009
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 local plugin_dir = CFG_PLUGINDIR or "./plugins/";
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12
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13 local logger = require "util.logger";
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14 local log = logger.init("modulemanager");
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15 local addDiscoInfoHandler = require "core.discomanager".addDiscoInfoHandler;
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16 local eventmanager = require "core.eventmanager";
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17 local config = require "core.configmanager";
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18 local multitable_new = require "util.multitable".new;
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19 local register_actions = require "core.actions".register;
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20
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21 local hosts = hosts;
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22
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23 local loadfile, pcall = loadfile, pcall;
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24 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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25 local pairs, ipairs = pairs, ipairs;
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26 local t_insert, t_concat = table.insert, table.concat;
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27 local type = type;
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28 local next = next;
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29 local rawget = rawget;
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31 local tostring, print = tostring, print;
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32
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33 -- We need this to let modules access the real global namespace
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34 local _G = _G;
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35
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36 module "modulemanager"
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37
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38 local api = {}; -- Module API container
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39
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40 local modulemap = { ["*"] = {} };
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41
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42 local stanza_handlers = multitable_new();
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43 local handler_info = {};
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44
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45 local modulehelpers = setmetatable({}, { __index = _G });
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46
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47 local features_table = multitable_new();
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48 local handler_table = multitable_new();
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49 local hooked = multitable_new();
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50 local event_hooks = multitable_new();
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51
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52 local NULL = {};
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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 -- Load modules from global section
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57 local modules_enabled = config.get("*", "core", "modules_enabled");
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58 local modules_disabled = config.get(host, "core", "modules_disabled");
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59 local disabled_set = {};
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60 if modules_enabled then
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61 if modules_disabled then
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62 for _, module in ipairs(modules_disabled) do
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63 disabled_set[module] = true;
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64 end
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65 end
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66 for _, module in ipairs(modules_enabled) do
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67 if not disabled_set[module] then
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68 load(host, module);
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69 end
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70 end
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71 end
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72
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73 -- Load modules from just this host
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74 local modules_enabled = config.get(host, "core", "modules_enabled");
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75 if modules_enabled then
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76 for _, module in pairs(modules_enabled) do
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77 if not is_loaded(host, module) then
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78 load(host, module);
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79 end
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80 end
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81 end
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82 end
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83 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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84 --
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85
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86 function load(host, module_name, config)
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87 if not (host and module_name) then
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88 return nil, "insufficient-parameters";
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89 end
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90
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91 if not modulemap[host] then
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92 modulemap[host] = {};
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93 end
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94
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95 if modulemap[host][module_name] then
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96 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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97 return nil, "module-already-loaded";
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98 elseif modulemap["*"][module_name] then
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99 return nil, "global-module-already-loaded";
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100 end
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101
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102
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103 local mod, err = loadfile(get_module_filename(module_name));
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104 if not mod then
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105 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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106 return nil, err;
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107 end
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108
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109 local _log = logger.init(host..":"..module_name);
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110 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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111
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112 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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113
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114 setfenv(mod, pluginenv);
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115 if not hosts[host] then hosts[host] = { type = "component", host = host, connected = false, s2sout = {} }; end
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116
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117 local success, ret = pcall(mod);
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118 if not success then
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119 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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120 return nil, ret;
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121 end
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122
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123 -- Use modified host, if the module set one
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124 modulemap[api_instance.host][module_name] = pluginenv;
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125
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126 return true;
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127 end
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128
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129 function get_module(host, name)
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130 return modulemap[host] and modulemap[host][name];
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131 end
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132
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133 function is_loaded(host, name)
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134 return modulemap[host] and modulemap[host][name] and true;
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135 end
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136
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137 function unload(host, name, ...)
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138 local mod = get_module(host, name);
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139 if not mod then return nil, "module-not-loaded"; end
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140
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141 if module_has_method(mod, "unload") then
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diff changeset
142 local ok, err = call_module_method(mod, "unload");
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143 if (not ok) and err then
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144 log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err);
439
6608ad3a72f3 is_loaded() and incomplete unload() for modules
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diff changeset
145 end
674
4f506c627b49 modulemanager: module.unload now gets called when modules are being unloaded
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parents: 670
diff changeset
146 end
670
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diff changeset
147 modulemap[host][name] = nil;
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diff changeset
148 features_table:remove(host, name);
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149 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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diff changeset
150 for _, param in pairs(params or NULL) do
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diff changeset
151 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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152 if handlers then
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diff changeset
153 handler_info[handlers[1]] = nil;
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diff changeset
154 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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parents: 686
diff changeset
155 end
439
6608ad3a72f3 is_loaded() and incomplete unload() for modules
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diff changeset
156 end
686
13ed38531f69 modulemanager: Per-host event hooks for plugins - solves issue 41
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parents: 675
diff changeset
157 event_hooks:remove(host, name);
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diff changeset
158 return true;
439
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diff changeset
159 end
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diff changeset
160
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diff changeset
161 function reload(host, name, ...)
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diff changeset
162 local mod = get_module(host, name);
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163 if not mod then return nil, "module-not-loaded"; end
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164
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diff changeset
165 local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors
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diff changeset
166 if not _mod then
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diff changeset
167 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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168 return nil, err;
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diff changeset
169 end
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170
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171 local saved;
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172
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diff changeset
173 if module_has_method(mod, "save") then
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diff changeset
174 local ok, ret, err = call_module_method(mod, "save");
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175 if ok then
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diff changeset
176 saved = ret;
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177 else
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diff changeset
178 log("warn", "Error saving module '%s:%s' state: %s", host, module, ret);
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diff changeset
179 if not config.get(host, "core", "force_module_reload") then
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diff changeset
180 log("warn", "Aborting reload due to error, set force_module_reload to ignore this");
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181 return nil, "save-state-failed";
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diff changeset
182 else
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diff changeset
183 log("warn", "Continuing with reload (using the force)");
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184 end
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185 end
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186 end
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187
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diff changeset
188 unload(host, name, ...);
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diff changeset
189 local ok, err = load(host, name, ...);
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diff changeset
190 if ok then
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diff changeset
191 mod = get_module(host, name);
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diff changeset
192 if module_has_method(mod, "restore") then
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diff changeset
193 local ok, err = call_module_method(mod, "restore", saved or {})
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194 if (not ok) and err then
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diff changeset
195 log("warn", "Error restoring module '%s' from '%s': %s", name, host, err);
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196 end
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197 end
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diff changeset
198 return true;
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199 end
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200 return ok, err;
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201 end
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diff changeset
202
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diff changeset
203 function handle_stanza(host, origin, stanza)
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diff changeset
204 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
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diff changeset
205 if name == "iq" and xmlns == "jabber:client" then
608
3758af511ce8 Don't try processing stanzas not of type get or set in module manager
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parents: 592
diff changeset
206 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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parents: 592
diff changeset
207 xmlns = stanza.tags[1].attr.xmlns;
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diff changeset
208 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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diff changeset
209 else
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diff changeset
210 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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diff changeset
211 return true;
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diff changeset
212 end
578
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
213 end
591
980ded4c60ef Removed unused variables
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parents: 590
diff changeset
214 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
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fad020cead52 Allow global modules to hook stanza handlers
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parents: 778
diff changeset
215 if not handlers then handlers = stanza_handlers:get("*", origin_type, name, xmlns); end
578
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
216 if handlers then
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
217 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
218 (handlers[1])(origin, stanza);
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
219 return true;
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
220 else
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
221 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); -- we didn't handle it
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parents: 573
diff changeset
222 end
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
223 end
39
89877d61ac51 Add support for arbitrary events and event hooks
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parents: 38
diff changeset
224
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diff changeset
225 function module_has_method(module, method)
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diff changeset
226 return type(module.module[method]) == "function";
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diff changeset
227 end
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diff changeset
228
747
40837f3422ab modulemanager: Add get_host_type() API method, and fix up call_module_method to work properly
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diff changeset
229 function call_module_method(module, method, ...)
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diff changeset
230 if module_has_method(module, method) then
748
172c43d735e9 modulemanager: Really fix call_module_method to work properly
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parents: 747
diff changeset
231 local f = module.module[method];
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diff changeset
232 return pcall(f, ...);
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parents: 733
diff changeset
233 else
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parents: 733
diff changeset
234 return false, "no-such-method";
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parents: 733
diff changeset
235 end
5a343599cd3e core.modulemanager: Some refactoring to make upcoming changes a little easier
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parents: 733
diff changeset
236 end
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diff changeset
237
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parents: 733
diff changeset
238 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
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parents: 733
diff changeset
239 function get_module_filename(name)
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parents: 733
diff changeset
240 _modulepath[3] = name;
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parents: 733
diff changeset
241 return t_concat(_modulepath);
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parents: 733
diff changeset
242 end
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diff changeset
243
438
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parents: 400
diff changeset
244 ----- API functions exposed to modules -----------
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parents: 400
diff changeset
245 -- Must all be in api.*
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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parents: 400
diff changeset
246
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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parents: 400
diff changeset
247 -- Returns the name of the current module
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parents: 400
diff changeset
248 function api:get_name()
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parents: 400
diff changeset
249 return self.name;
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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parents: 400
diff changeset
250 end
193f9dd64f17 Bumper commit for the new modulemanager API \o/ Updates all the modules, though some more changes may be in store.
Matthew Wild <mwild1@gmail.com>
parents: 400
diff changeset
251
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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parents: 400
diff changeset
252 -- Returns the host that the current module is serving
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parents: 400
diff changeset
253 function api:get_host()
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parents: 400
diff changeset
254 return self.host;
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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parents: 400
diff changeset
255 end
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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parents: 400
diff changeset
256
747
40837f3422ab modulemanager: Add get_host_type() API method, and fix up call_module_method to work properly
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parents: 746
diff changeset
257 function api:get_host_type()
40837f3422ab modulemanager: Add get_host_type() API method, and fix up call_module_method to work properly
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parents: 746
diff changeset
258 return hosts[self.host].type;
40837f3422ab modulemanager: Add get_host_type() API method, and fix up call_module_method to work properly
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parents: 746
diff changeset
259 end
40837f3422ab modulemanager: Add get_host_type() API method, and fix up call_module_method to work properly
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parents: 746
diff changeset
260
746
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parents: 745
diff changeset
261 function api:set_global()
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parents: 745
diff changeset
262 self.host = "*";
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diff changeset
263 end
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parents: 745
diff changeset
264
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parents: 589
diff changeset
265 local function _add_handler(module, origin_type, tag, xmlns, handler)
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980ded4c60ef Removed unused variables
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parents: 590
diff changeset
266 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
590
54afe37cccbf Combined and merged similar code
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267 local msg = (tag == "iq") and "namespace" or "payload namespace";
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268 if not handlers then
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269 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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270 handler_info[handler] = module;
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271 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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272 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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273 else
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274 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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275 end
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276 end
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277
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278 function api:add_handler(origin_type, tag, xmlns, handler)
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279 if not (origin_type and tag and xmlns and handler) then return false; end
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280 if type(origin_type) == "table" then
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281 for _, origin_type in ipairs(origin_type) do
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282 _add_handler(self, origin_type, tag, xmlns, handler);
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283 end
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284 else
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285 _add_handler(self, origin_type, tag, xmlns, handler);
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286 end
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287 end
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288 function api:add_iq_handler(origin_type, xmlns, handler)
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289 self:add_handler(origin_type, "iq", xmlns, handler);
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290 end
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291
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292 addDiscoInfoHandler("*host", function(reply, to, from, node)
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293 if #node == 0 then
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294 local done = {};
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295 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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296 for feature in pairs(features) do
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297 if not done[feature] then
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298 reply:tag("feature", {var = feature}):up(); -- TODO cache
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299 done[feature] = true;
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300 end
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301 end
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302 end
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303 return next(done) ~= nil;
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304 end
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305 end);
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306
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307 function api:add_feature(xmlns)
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308 features_table:set(self.host, self.name, xmlns, true);
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309 end
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310
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311 local event_hook = function(host, mod_name, event_name, ...)
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312 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
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313 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
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314 handler(...);
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315 end
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316 end;
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317 function api:add_event_hook(name, handler)
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318 if not hooked:get(self.host, self.name, name) then
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319 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
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320 hooked:set(self.host, self.name, name, true);
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321 end
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322 event_hooks:set(self.host, self.name, name, handler, true);
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323 end
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324
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325 --------------------------------------------------------------------
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326
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327 local actions = {};
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328
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329 function actions.load(params)
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330 --return true, "Module loaded ("..params.module.." on "..params.host..")";
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331 return load(params.host, params.module);
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332 end
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333
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334 function actions.unload(params)
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335 return unload(params.host, params.module);
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336 end
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337
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338 register_actions("/modules", actions);
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339
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340 return _M;