prosody
4f1994f7bd54
core/modulemanager.lua

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core/modulemanager.lua @ 1326:4f1994f7bd54

modulemanager: Allow setting a priority while adding an event handler via the module:hook API
author Waqas Hussain <waqas20@gmail.com>
date Sun, 07 Jun 2009 18:04:56 +0500
parent 1309:a544e68a0989
child 1328:0709c9564b1c
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rev   line source
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2c0b9e3c11c3 0.3->0.4
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diff changeset
1 -- Prosody IM v0.4
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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 local st = require "util.stanza";
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21
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22 local hosts = hosts;
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23 local prosody = prosody;
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24
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25 local loadfile, pcall = loadfile, pcall;
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26 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv;
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27 local pairs, ipairs = pairs, ipairs;
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28 local t_insert, t_concat = table.insert, table.concat;
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29 local type = type;
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30 local next = next;
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31 local rawget = rawget;
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32
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33 local tostring = tostring;
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34
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35 -- We need this to let modules access the real global namespace
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36 local _G = _G;
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37
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38 module "modulemanager"
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39
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40 local api = {}; -- Module API container
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41
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42 local modulemap = { ["*"] = {} };
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43
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44 local stanza_handlers = multitable_new();
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45 local handler_info = {};
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46
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47 local modulehelpers = setmetatable({}, { __index = _G });
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48
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49 local features_table = multitable_new();
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50 local handler_table = multitable_new();
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51 local hooked = multitable_new();
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52 local hooks = multitable_new();
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53 local event_hooks = multitable_new();
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54
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55 local NULL = {};
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56
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57 -- Load modules when a host is activated
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58 function load_modules_for_host(host)
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59 if config.get(host, "core", "modules_enable") == false then
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60 return; -- Only load for hosts, not components, etc.
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61 end
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62
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63 -- Load modules from global section
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64 local modules_enabled = config.get("*", "core", "modules_enabled");
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65 local modules_disabled = config.get(host, "core", "modules_disabled");
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66 local disabled_set = {};
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67 if modules_enabled then
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68 if modules_disabled then
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69 for _, module in ipairs(modules_disabled) do
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70 disabled_set[module] = true;
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71 end
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72 end
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73 for _, module in ipairs({"presence", "message", "iq"}) do
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74 if not disabled_set[module] then
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75 load(host, module);
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76 end
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77 end
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78 for _, module in ipairs(modules_enabled) do
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79 if not disabled_set[module] and not is_loaded(host, module) then
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80 load(host, module);
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81 end
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82 end
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83 end
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84
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85 -- Load modules from just this host
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86 local modules_enabled = config.get(host, "core", "modules_enabled");
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87 if modules_enabled then
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88 for _, module in pairs(modules_enabled) do
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89 if not is_loaded(host, module) then
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90 load(host, module);
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91 end
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92 end
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93 end
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94 end
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95 eventmanager.add_event_hook("host-activated", load_modules_for_host);
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96 --
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97
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98 function load(host, module_name, config)
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99 if not (host and module_name) then
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100 return nil, "insufficient-parameters";
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101 end
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102
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103 if not modulemap[host] then
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104 modulemap[host] = {};
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105 end
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106
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107 if modulemap[host][module_name] then
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108 log("warn", "%s is already loaded for %s, so not loading again", module_name, host);
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109 return nil, "module-already-loaded";
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110 elseif modulemap["*"][module_name] then
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111 return nil, "global-module-already-loaded";
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112 end
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113
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114
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115 local mod, err = loadfile(get_module_filename(module_name));
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116 if not mod then
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117 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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118 return nil, err;
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119 end
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120
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121 local _log = logger.init(host..":"..module_name);
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122 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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123
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124 local pluginenv = setmetatable({ module = api_instance }, { __index = _G });
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125
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126 setfenv(mod, pluginenv);
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127 if not hosts[host] then hosts[host] = { type = "component", host = host, connected = false, s2sout = {} }; end
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128
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129 local success, ret = pcall(mod);
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130 if not success then
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131 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil");
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132 return nil, ret;
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133 end
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134
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135 -- Use modified host, if the module set one
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136 modulemap[api_instance.host][module_name] = pluginenv;
438
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diff changeset
137
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diff changeset
138 if api_instance.host == "*" and host ~= "*" then
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diff changeset
139 api_instance:set_global();
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140 end
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141
229
01bd24ea488d We now fail if modules fail to load at startup.
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diff changeset
142 return true;
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143 end
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144
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145 function get_module(host, name)
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146 return modulemap[host] and modulemap[host][name];
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147 end
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148
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149 function is_loaded(host, name)
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diff changeset
150 return modulemap[host] and modulemap[host][name] and true;
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151 end
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152
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153 function unload(host, name, ...)
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154 local mod = get_module(host, name);
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155 if not mod then return nil, "module-not-loaded"; end
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156
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157 if module_has_method(mod, "unload") then
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158 local ok, err = call_module_method(mod, "unload");
439
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diff changeset
159 if (not ok) and err then
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160 log("warn", "Non-fatal error unloading module '%s' on '%s': %s", name, host, err);
439
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161 end
674
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162 end
670
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163 modulemap[host][name] = nil;
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164 features_table:remove(host, name);
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165 local params = handler_table:get(host, name); -- , {module.host, origin_type, tag, xmlns}
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166 for _, param in pairs(params or NULL) do
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167 local handlers = stanza_handlers:get(param[1], param[2], param[3], param[4]);
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168 if handlers then
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169 handler_info[handlers[1]] = nil;
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170 stanza_handlers:remove(param[1], param[2], param[3], param[4]);
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171 end
439
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172 end
686
13ed38531f69 modulemanager: Per-host event hooks for plugins - solves issue 41
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173 event_hooks:remove(host, name);
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174 -- unhook event handlers hooked by module:hook
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diff changeset
175 for event, handlers in pairs(hooks:get(host, name) or NULL) do
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176 for handler in pairs(handlers or NULL) do
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177 (hosts[host] or prosody).events.remove_handler(event, handler);
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178 end
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179 end
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180 hooks:remove(host, name);
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181 return true;
439
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182 end
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183
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184 function reload(host, name, ...)
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185 local mod = get_module(host, name);
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186 if not mod then return nil, "module-not-loaded"; end
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187
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188 local _mod, err = loadfile(get_module_filename(name)); -- checking for syntax errors
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diff changeset
189 if not _mod then
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diff changeset
190 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil");
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191 return nil, err;
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192 end
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193
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194 local saved;
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195
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196 if module_has_method(mod, "save") then
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197 local ok, ret, err = call_module_method(mod, "save");
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198 if ok then
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199 saved = ret;
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200 else
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201 log("warn", "Error saving module '%s:%s' state: %s", host, module, ret);
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202 if not config.get(host, "core", "force_module_reload") then
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203 log("warn", "Aborting reload due to error, set force_module_reload to ignore this");
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204 return nil, "save-state-failed";
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205 else
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diff changeset
206 log("warn", "Continuing with reload (using the force)");
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207 end
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208 end
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209 end
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210
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diff changeset
211 unload(host, name, ...);
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diff changeset
212 local ok, err = load(host, name, ...);
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213 if ok then
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214 mod = get_module(host, name);
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diff changeset
215 if module_has_method(mod, "restore") then
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diff changeset
216 local ok, err = call_module_method(mod, "restore", saved or {})
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diff changeset
217 if (not ok) and err then
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218 log("warn", "Error restoring module '%s' from '%s': %s", name, host, err);
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219 end
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diff changeset
220 end
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diff changeset
221 return true;
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222 end
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223 return ok, err;
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224 end
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diff changeset
225
578
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
226 function handle_stanza(host, origin, stanza)
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diff changeset
227 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type;
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
228 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
229 if stanza.attr.type == "get" or stanza.attr.type == "set" then
929
b4f2ca7f6f00 Fixed: modulemanager: IQs with extended elements in the default namespace could cause backtraces (related to issue #74)
Waqas Hussain <waqas20@gmail.com>
parents: 896
diff changeset
230 xmlns = stanza.tags[1].attr.xmlns or "jabber:client";
608
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parents: 592
diff changeset
231 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns);
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parents: 592
diff changeset
232 else
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parents: 592
diff changeset
233 log("debug", "Discarding %s from %s of type: %s", name, origin_type, stanza.attr.type);
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diff changeset
234 return true;
3758af511ce8 Don't try processing stanzas not of type get or set in module manager
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diff changeset
235 end
578
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
236 end
591
980ded4c60ef Removed unused variables
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parents: 590
diff changeset
237 local handlers = stanza_handlers:get(host, origin_type, name, xmlns);
876
fad020cead52 Allow global modules to hook stanza handlers
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parents: 778
diff changeset
238 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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parents: 573
diff changeset
239 if handlers then
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parents: 573
diff changeset
240 log("debug", "Passing stanza to mod_%s", handler_info[handlers[1]].name);
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parents: 573
diff changeset
241 (handlers[1])(origin, stanza);
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parents: 573
diff changeset
242 return true;
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parents: 573
diff changeset
243 else
1167
5620ea24be94 stanza_router: Removed global function core_handle_stanza
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parents: 1105
diff changeset
244 log("debug", "Unhandled %s stanza: %s; xmlns=%s", origin.type, stanza.name, xmlns); -- we didn't handle it
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parents: 1105
diff changeset
245 if stanza.attr.xmlns == "jabber:client" then
5620ea24be94 stanza_router: Removed global function core_handle_stanza
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parents: 1105
diff changeset
246 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
5620ea24be94 stanza_router: Removed global function core_handle_stanza
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parents: 1105
diff changeset
247 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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diff changeset
248 end
1173
09a4cd461673 modulemanager: Don't close the stream on unhandled stream:features
Waqas Hussain <waqas20@gmail.com>
parents: 1167
diff changeset
249 elseif not(name == "features" and xmlns == "http://etherx.jabber.org/streams") then -- FIXME remove check once we handle S2S features
1167
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parents: 1105
diff changeset
250 origin:close("unsupported-stanza-type");
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parents: 1105
diff changeset
251 end
578
5879264e28e2 Changed module manager to use multitable (initial commit)
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parents: 573
diff changeset
252 end
5879264e28e2 Changed module manager to use multitable (initial commit)
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diff changeset
253 end
39
89877d61ac51 Add support for arbitrary events and event hooks
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parents: 38
diff changeset
254
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diff changeset
255 function module_has_method(module, method)
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diff changeset
256 return type(module.module[method]) == "function";
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diff changeset
257 end
5a343599cd3e core.modulemanager: Some refactoring to make upcoming changes a little easier
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diff changeset
258
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
259 function call_module_method(module, method, ...)
745
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parents: 733
diff changeset
260 if module_has_method(module, method) then
748
172c43d735e9 modulemanager: Really fix call_module_method to work properly
Matthew Wild <mwild1@gmail.com>
parents: 747
diff changeset
261 local f = module.module[method];
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diff changeset
262 return pcall(f, ...);
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parents: 733
diff changeset
263 else
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parents: 733
diff changeset
264 return false, "no-such-method";
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265 end
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266 end
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267
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268 local _modulepath = { plugin_dir, "mod_", nil, ".lua"};
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269 function get_module_filename(name)
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270 _modulepath[3] = name;
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271 return t_concat(_modulepath);
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272 end
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273
438
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274 ----- API functions exposed to modules -----------
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275 -- Must all be in api.*
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276
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277 -- Returns the name of the current module
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278 function api:get_name()
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279 return self.name;
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280 end
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281
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282 -- Returns the host that the current module is serving
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283 function api:get_host()
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284 return self.host;
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285 end
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286
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287 function api:get_host_type()
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288 return hosts[self.host].type;
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289 end
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290
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291 function api:set_global()
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292 self.host = "*";
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293 -- Update the logger
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294 local _log = logger.init("mod_"..self.name);
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295 self.log = function (self, ...) return _log(...); end;
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296 self._log = _log;
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297 end
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298
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299 local function _add_handler(module, origin_type, tag, xmlns, handler)
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300 local handlers = stanza_handlers:get(module.host, origin_type, tag, xmlns);
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301 local msg = (tag == "iq") and "namespace" or "payload namespace";
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302 if not handlers then
591
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303 stanza_handlers:add(module.host, origin_type, tag, xmlns, handler);
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304 handler_info[handler] = module;
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305 handler_table:add(module.host, module.name, {module.host, origin_type, tag, xmlns});
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306 --module:log("debug", "I now handle tag '%s' [%s] with %s '%s'", tag, origin_type, msg, xmlns);
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307 else
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308 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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309 end
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310 end
438
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311
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312 function api:add_handler(origin_type, tag, xmlns, handler)
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313 if not (origin_type and tag and xmlns and handler) then return false; end
438
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314 if type(origin_type) == "table" then
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315 for _, origin_type in ipairs(origin_type) do
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316 _add_handler(self, origin_type, tag, xmlns, handler);
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317 end
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318 else
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319 _add_handler(self, origin_type, tag, xmlns, handler);
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320 end
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321 end
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322 function api:add_iq_handler(origin_type, xmlns, handler)
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323 self:add_handler(origin_type, "iq", xmlns, handler);
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324 end
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325
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326 addDiscoInfoHandler("*host", function(reply, to, from, node)
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327 if #node == 0 then
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328 local done = {};
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329 for module, features in pairs(features_table:get(to) or NULL) do -- for each module
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330 for feature in pairs(features) do
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331 if not done[feature] then
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332 reply:tag("feature", {var = feature}):up(); -- TODO cache
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333 done[feature] = true;
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334 end
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335 end
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336 end
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337 for module, features in pairs(features_table:get("*") or NULL) do -- for each module
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338 for feature in pairs(features) do
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339 if not done[feature] then
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340 reply:tag("feature", {var = feature}):up(); -- TODO cache
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341 done[feature] = true;
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342 end
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343 end
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344 end
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345 return next(done) ~= nil;
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346 end
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347 end);
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348
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349 function api:add_feature(xmlns)
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350 features_table:set(self.host, self.name, xmlns, true);
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351 end
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352
686
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353 local event_hook = function(host, mod_name, event_name, ...)
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354 if type((...)) == "table" and (...).host and (...).host ~= host then return; end
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355 for handler in pairs(event_hooks:get(host, mod_name, event_name) or NULL) do
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356 handler(...);
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357 end
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358 end;
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359 function api:add_event_hook(name, handler)
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360 if not hooked:get(self.host, self.name, name) then
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361 eventmanager.add_event_hook(name, function(...) event_hook(self.host, self.name, name, ...); end);
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362 hooked:set(self.host, self.name, name, true);
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363 end
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364 event_hooks:set(self.host, self.name, name, handler, true);
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365 end
438
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366
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367 function api:fire_event(...)
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368 return (hosts[self.host] or prosody).events.fire_event(...);
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369 end
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370
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371 function api:hook(event, handler, priority)
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372 hooks:set(self.host, self.name, event, handler, true);
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373 (hosts[self.host] or prosody).events.add_handler(event, handler, priority);
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374 end
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375
438
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diff changeset
376 --------------------------------------------------------------------
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diff changeset
377
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378 local actions = {};
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379
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380 function actions.load(params)
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381 --return true, "Module loaded ("..params.module.." on "..params.host..")";
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382 return load(params.host, params.module);
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383 end
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384
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385 function actions.unload(params)
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386 return unload(params.host, params.module);
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387 end
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388
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389 register_actions("/modules", actions);
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diff changeset
390
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diff changeset
391 return _M;