prosody
3cbfa768eb06
core/moduleapi.lua

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core/moduleapi.lua @ 4539:3cbfa768eb06

moduleapi: Add module:shared(), a way to easily share data between multiple loaded modules
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 Jan 2012 19:48:53 +0000
parent 4538:d0a89c1c43fd
child 4605:69746db53125
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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
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16 local multitable_new = require "util.multitable".new;
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17
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18 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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19 local error, setmetatable, setfenv, type = error, setmetatable, setfenv, type;
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20 local ipairs, pairs, select, unpack = ipairs, pairs, select, unpack;
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21 local tonumber, tostring = tonumber, tostring;
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22
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23 local prosody = prosody;
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24 local hosts = prosody.hosts;
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25
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26 -- Registry of shared module data
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27 local shared_data = setmetatable({}, { __mode = "v" });
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28
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29 local NULL = {};
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30
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31 local api = {};
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32
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33 -- Returns the name of the current module
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34 function api:get_name()
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35 return self.name;
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36 end
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37
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38 -- Returns the host that the current module is serving
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39 function api:get_host()
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40 return self.host;
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41 end
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42
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43 function api:get_host_type()
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44 return hosts[self.host].type;
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45 end
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46
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47 function api:set_global()
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48 self.host = "*";
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49 -- Update the logger
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50 local _log = logger.init("mod_"..self.name);
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51 self.log = function (self, ...) return _log(...); end;
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52 self._log = _log;
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53 end
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54
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55 function api:add_feature(xmlns)
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56 self:add_item("feature", xmlns);
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57 end
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58 function api:add_identity(category, type, name)
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59 self:add_item("identity", {category = category, type = type, name = name});
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60 end
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61 function api:add_extension(data)
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62 self:add_item("extension", data);
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63 end
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64
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65 function api:fire_event(...)
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66 return (hosts[self.host] or prosody).events.fire_event(...);
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67 end
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68
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69 function api:hook_object_event(object, event, handler, priority)
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70 self.event_handlers[handler] = { name = event, priority = priority, object = object };
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71 return object.add_handler(event, handler, priority);
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72 end
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73
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74 function api:hook(event, handler, priority)
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75 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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76 end
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77
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78 function api:hook_global(event, handler, priority)
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79 return self:hook_object_event(prosody.events, event, handler, priority);
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80 end
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81
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82 function api:hook_stanza(xmlns, name, handler, priority)
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83 if not handler and type(name) == "function" then
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84 -- If only 2 options then they specified no xmlns
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85 xmlns, name, handler, priority = nil, xmlns, name, handler;
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86 elseif not (handler and name) then
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87 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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88 return;
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89 end
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90 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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91 end
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92
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93 function api:require(lib)
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94 local f, n = pluginloader.load_code(self.name, lib..".lib.lua");
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95 if not f then
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96 f, n = pluginloader.load_code(lib, lib..".lib.lua");
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97 end
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98 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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99 setfenv(f, self.environment);
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100 return f();
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101 end
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102
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103 function api:depends(name)
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104 if not self.dependencies then
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105 self.dependencies = {};
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106 self:hook("module-reloaded", function (event)
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107 if self.dependencies[event.module] then
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108 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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109 modulemanager.reload(self.host, self.name);
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110 return;
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111 end
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112 end);
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113 self:hook("module-unloaded", function (event)
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114 if self.dependencies[event.module] then
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115 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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116 modulemanager.unload(self.host, self.name);
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117 end
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118 end);
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119 end
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120 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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121 if not mod then
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122 local err;
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123 mod, err = modulemanager.load(self.host, name);
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124 if not mod then
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125 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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126 end
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127 end
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128 self.dependencies[name] = true;
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129 return mod;
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130 end
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131
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132 -- Returns one or more shared tables at the specified virtual paths
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133 -- Intentionally does not allow the table at a path to be _set_, it
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134 -- is auto-created if it does not exist.
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135 function api:shared(...)
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136 local paths = { n = select("#", ...), ... };
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137 local data_array = {};
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138 local default_path_components = { self.host, self.name };
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139 for i = 1, paths.n do
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140 local path = paths[i];
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141 if path:sub(1,1) ~= "/" then -- Prepend default components
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142 local n_components = select(2, path:gsub("/", "%1"));
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143 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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144 end
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145 local shared = shared_data[path];
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146 if not shared then
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147 shared = {};
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148 shared_data[path] = shared;
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149 end
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150 t_insert(data_array, shared);
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151 end
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152 return unpack(data_array);
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153 end
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154
4531
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155 function api:get_option(name, default_value)
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156 local value = config.get(self.host, self.name, name);
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157 if value == nil then
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158 value = config.get(self.host, "core", name);
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159 if value == nil then
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160 value = default_value;
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161 end
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162 end
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163 return value;
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164 end
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165
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166 function api:get_option_string(name, default_value)
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167 local value = self:get_option(name, default_value);
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168 if type(value) == "table" then
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169 if #value > 1 then
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170 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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171 end
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172 value = value[1];
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173 end
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174 if value == nil then
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175 return nil;
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176 end
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177 return tostring(value);
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178 end
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179
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180 function api:get_option_number(name, ...)
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181 local value = self:get_option(name, ...);
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182 if type(value) == "table" then
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183 if #value > 1 then
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184 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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185 end
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186 value = value[1];
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187 end
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188 local ret = tonumber(value);
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189 if value ~= nil and ret == nil then
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190 self:log("error", "Config option '%s' not understood, expecting a number", name);
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191 end
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192 return ret;
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193 end
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194
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195 function api:get_option_boolean(name, ...)
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196 local value = self:get_option(name, ...);
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197 if type(value) == "table" then
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198 if #value > 1 then
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199 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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200 end
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201 value = value[1];
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202 end
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203 if value == nil then
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204 return nil;
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205 end
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206 local ret = value == true or value == "true" or value == 1 or nil;
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207 if ret == nil then
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208 ret = (value == false or value == "false" or value == 0);
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209 if ret then
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210 ret = false;
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211 else
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212 ret = nil;
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213 end
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214 end
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215 if ret == nil then
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216 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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217 end
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218 return ret;
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219 end
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220
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221 function api:get_option_array(name, ...)
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222 local value = self:get_option(name, ...);
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223
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224 if value == nil then
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225 return nil;
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226 end
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227
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228 if type(value) ~= "table" then
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229 return array{ value }; -- Assume any non-list is a single-item list
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230 end
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231
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232 return array():append(value); -- Clone
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233 end
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234
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235 function api:get_option_set(name, ...)
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236 local value = self:get_option_array(name, ...);
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237
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238 if value == nil then
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239 return nil;
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240 end
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241
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242 return set.new(value);
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243 end
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244
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245 local module_items = multitable_new();
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246 function api:add_item(key, value)
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247 self.items = self.items or {};
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248 self.items[key] = self.items[key] or {};
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249 t_insert(self.items[key], value);
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250 self:fire_event("item-added/"..key, {source = self, item = value});
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251 end
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252 function api:remove_item(key, value)
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253 local t = self.items and self.items[key] or NULL;
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254 for i = #t,1,-1 do
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255 if t[i] == value then
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256 t_remove(self.items[key], i);
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257 self:fire_event("item-removed/"..key, {source = self, item = value});
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258 return value;
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259 end
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260 end
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261 end
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262
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263 function api:get_host_items(key)
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264 local result = {};
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265 for mod_name, module in pairs(modulemanager.get_modules(self.host)) do
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266 module = module.module;
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267 if module.items then
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268 for _, item in ipairs(module.items[key] or NULL) do
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269 t_insert(result, item);
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270 end
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271 end
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272 end
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273 for mod_name, module in pairs(modulemanager.get_modules("*")) do
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274 module = module.module;
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275 if module.items then
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276 for _, item in ipairs(module.items[key] or NULL) do
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277 t_insert(result, item);
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278 end
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279 end
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280 end
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281 return result;
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282 end
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283
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284 function api:handle_items(type, added_cb, removed_cb, existing)
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285 self:hook("item-added/"..type, added_cb);
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286 self:hook("item-removed/"..type, removed_cb);
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287 if existing ~= false then
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288 for _, item in ipairs(self:get_host_items(type)) do
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289 added_cb({ item = item });
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290 end
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291 end
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292 end
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293
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294 return api;