prosody
98ff89ab5d1d
core/moduleapi.lua

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core/moduleapi.lua @ 4893:98ff89ab5d1d

moduleapi, modulemanager: Re-structure module.event_handlers so that the same handler can harmlessly handle multiple events (thanks Zash)
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 May 2012 23:53:02 +0100
parent 4854:dab55c6f7710
child 4896:27cda15104f2
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2012 Matthew Wild
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3 -- Copyright (C) 2008-2012 Waqas Hussain
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4 --
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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 local config = require "core.configmanager";
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10 local modulemanager = require "modulemanager";
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11 local array = require "util.array";
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12 local set = require "util.set";
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13 local logger = require "util.logger";
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14 local pluginloader = require "util.pluginloader";
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15 local timer = require "util.timer";
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16
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17 local multitable_new = require "util.multitable".new;
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18
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19 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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20 local error, setmetatable, setfenv, type = error, setmetatable, setfenv, type;
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21 local ipairs, pairs, select, unpack = ipairs, pairs, select, unpack;
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22 local tonumber, tostring = tonumber, tostring;
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23
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24 local prosody = prosody;
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25 local hosts = prosody.hosts;
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26 local core_post_stanza = prosody.core_post_stanza;
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27
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28 -- Registry of shared module data
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29 local shared_data = setmetatable({}, { __mode = "v" });
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30
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31 local NULL = {};
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32
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33 local api = {};
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34
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35 -- Returns the name of the current module
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36 function api:get_name()
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37 return self.name;
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38 end
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39
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40 -- Returns the host that the current module is serving
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41 function api:get_host()
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42 return self.host;
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43 end
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44
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45 function api:get_host_type()
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46 return self.host ~= "*" and hosts[self.host].type or nil;
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47 end
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48
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49 function api:set_global()
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50 self.host = "*";
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51 -- Update the logger
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52 local _log = logger.init("mod_"..self.name);
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53 self.log = function (self, ...) return _log(...); end;
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54 self._log = _log;
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55 self.global = true;
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56 end
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57
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58 function api:add_feature(xmlns)
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59 self:add_item("feature", xmlns);
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60 end
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61 function api:add_identity(category, type, name)
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62 self:add_item("identity", {category = category, type = type, name = name});
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63 end
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64 function api:add_extension(data)
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65 self:add_item("extension", data);
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66 end
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67
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68 function api:fire_event(...)
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69 return (hosts[self.host] or prosody).events.fire_event(...);
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70 end
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71
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72 function api:hook_object_event(object, event, handler, priority)
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73 local handlers = self.event_handlers[event];
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74 if not handlers then
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75 handlers = {};
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76 self.event_handlers[event] = handlers;
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77 end
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78 handlers[event] = { handler = handler, priority = priority, object = object };
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79 return object.add_handler(event, handler, priority);
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80 end
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81
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82 function api:unhook_object_event(object, event, handler)
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83 return object.remove_handler(event, handler);
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84 end
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85
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86 function api:hook(event, handler, priority)
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87 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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88 end
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89
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90 function api:hook_global(event, handler, priority)
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91 return self:hook_object_event(prosody.events, event, handler, priority);
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92 end
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93
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94 function api:hook_tag(xmlns, name, handler, priority)
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95 if not handler and type(name) == "function" then
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96 -- If only 2 options then they specified no xmlns
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97 xmlns, name, handler, priority = nil, xmlns, name, handler;
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98 elseif not (handler and name) then
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99 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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100 return;
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101 end
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102 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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103 end
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104 api.hook_stanza = api.hook_tag; -- COMPAT w/pre-0.9
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105
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106 function api:require(lib)
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107 local f, n = pluginloader.load_code(self.name, lib..".lib.lua");
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108 if not f then
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109 f, n = pluginloader.load_code(lib, lib..".lib.lua");
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110 end
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111 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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112 setfenv(f, self.environment);
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113 return f();
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114 end
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115
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116 function api:depends(name)
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117 if not self.dependencies then
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118 self.dependencies = {};
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119 self:hook("module-reloaded", function (event)
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120 if self.dependencies[event.module] and not self.reloading then
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121 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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122 modulemanager.reload(self.host, self.name);
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123 return;
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124 end
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125 end);
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126 self:hook("module-unloaded", function (event)
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127 if self.dependencies[event.module] then
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128 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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129 modulemanager.unload(self.host, self.name);
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130 end
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131 end);
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132 end
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133 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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134 if mod and mod.module.host == "*" and self.host ~= "*"
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135 and modulemanager.module_has_method(mod, "add_host") then
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136 mod = nil; -- This is a shared module, so we still want to load it on our host
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137 end
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138 if not mod then
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139 local err;
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140 mod, err = modulemanager.load(self.host, name);
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141 if not mod then
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142 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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143 end
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144 end
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145 self.dependencies[name] = true;
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146 return mod;
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147 end
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148
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149 -- Returns one or more shared tables at the specified virtual paths
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150 -- Intentionally does not allow the table at a path to be _set_, it
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151 -- is auto-created if it does not exist.
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152 function api:shared(...)
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153 if not self.shared_data then self.shared_data = {}; end
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154 local paths = { n = select("#", ...), ... };
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155 local data_array = {};
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156 local default_path_components = { self.host, self.name };
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157 for i = 1, paths.n do
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158 local path = paths[i];
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159 if path:sub(1,1) ~= "/" then -- Prepend default components
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160 local n_components = select(2, path:gsub("/", "%1"));
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161 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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162 end
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163 local shared = shared_data[path];
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164 if not shared then
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165 shared = {};
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166 shared_data[path] = shared;
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167 end
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168 t_insert(data_array, shared);
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169 self.shared_data[path] = shared;
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170 end
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171 return unpack(data_array);
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172 end
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173
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174 function api:get_option(name, default_value)
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175 local value = config.get(self.host, self.name, name);
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176 if value == nil then
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177 value = config.get(self.host, "core", name);
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178 if value == nil then
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179 value = default_value;
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180 end
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181 end
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182 return value;
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183 end
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184
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185 function api:get_option_string(name, default_value)
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186 local value = self:get_option(name, default_value);
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187 if type(value) == "table" then
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188 if #value > 1 then
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189 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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190 end
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191 value = value[1];
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192 end
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193 if value == nil then
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194 return nil;
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195 end
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196 return tostring(value);
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197 end
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198
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199 function api:get_option_number(name, ...)
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200 local value = self:get_option(name, ...);
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201 if type(value) == "table" then
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202 if #value > 1 then
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203 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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204 end
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205 value = value[1];
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206 end
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207 local ret = tonumber(value);
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208 if value ~= nil and ret == nil then
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209 self:log("error", "Config option '%s' not understood, expecting a number", name);
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210 end
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211 return ret;
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212 end
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213
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214 function api:get_option_boolean(name, ...)
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215 local value = self:get_option(name, ...);
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216 if type(value) == "table" then
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217 if #value > 1 then
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218 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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219 end
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220 value = value[1];
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221 end
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222 if value == nil then
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223 return nil;
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224 end
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225 local ret = value == true or value == "true" or value == 1 or nil;
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226 if ret == nil then
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227 ret = (value == false or value == "false" or value == 0);
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228 if ret then
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229 ret = false;
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230 else
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231 ret = nil;
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232 end
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233 end
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234 if ret == nil then
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235 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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236 end
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237 return ret;
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238 end
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239
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240 function api:get_option_array(name, ...)
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241 local value = self:get_option(name, ...);
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242
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243 if value == nil then
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244 return nil;
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245 end
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246
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247 if type(value) ~= "table" then
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248 return array{ value }; -- Assume any non-list is a single-item list
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249 end
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250
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251 return array():append(value); -- Clone
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252 end
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253
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254 function api:get_option_set(name, ...)
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255 local value = self:get_option_array(name, ...);
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256
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257 if value == nil then
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258 return nil;
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259 end
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260
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261 return set.new(value);
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262 end
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263
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264 function api:add_item(key, value)
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265 self.items = self.items or {};
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266 self.items[key] = self.items[key] or {};
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267 t_insert(self.items[key], value);
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268 self:fire_event("item-added/"..key, {source = self, item = value});
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269 end
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270 function api:remove_item(key, value)
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271 local t = self.items and self.items[key] or NULL;
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272 for i = #t,1,-1 do
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273 if t[i] == value then
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274 t_remove(self.items[key], i);
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275 self:fire_event("item-removed/"..key, {source = self, item = value});
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276 return value;
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277 end
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278 end
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279 end
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280
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281 function api:get_host_items(key)
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282 local result = {};
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283 for mod_name, module in pairs(modulemanager.get_modules(self.host)) do
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284 module = module.module;
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285 if module.items then
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286 for _, item in ipairs(module.items[key] or NULL) do
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287 t_insert(result, item);
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288 end
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289 end
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290 end
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291 for mod_name, module in pairs(modulemanager.get_modules("*")) do
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292 module = module.module;
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293 if module.items then
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294 for _, item in ipairs(module.items[key] or NULL) do
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295 t_insert(result, item);
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296 end
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297 end
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298 end
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299 return result;
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300 end
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301
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302 function api:handle_items(type, added_cb, removed_cb, existing)
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303 self:hook("item-added/"..type, added_cb);
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304 self:hook("item-removed/"..type, removed_cb);
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305 if existing ~= false then
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306 for _, item in ipairs(self:get_host_items(type)) do
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307 added_cb({ item = item });
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308 end
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309 end
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310 end
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311
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312 function api:provides(name, item)
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313 if not item then item = self.environment; end
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314 if not item.name then
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315 local item_name = self.name;
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316 -- Strip a provider prefix to find the item name
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317 -- (e.g. "auth_foo" -> "foo" for an auth provider)
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318 if item_name:find(name.."_", 1, true) == 1 then
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319 item_name = item_name:sub(#name+2);
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320 end
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321 item.name = item_name;
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322 end
4661
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323 self:add_item(name.."-provider", item);
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324 end
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325
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326 function api:send(stanza)
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327 return core_post_stanza(hosts[self.host], stanza);
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328 end
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329
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330 function api:add_timer(delay, callback)
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331 return timer.add_task(delay, function (t)
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332 if self.loaded == false then return; end
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diff changeset
333 return callback(t);
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diff changeset
334 end);
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335 end
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336
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diff changeset
337 local path_sep = package.config:sub(1,1);
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diff changeset
338 function api:get_directory()
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339 return self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
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340 end
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341
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342 function api:load_resource(path, mode)
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diff changeset
343 path = config.resolve_relative_path(self:get_directory(), path);
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344 return io.open(path, mode);
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345 end
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346
4531
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347 return api;