prosody
a5fcda77c6b1
core/moduleapi.lua

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core/moduleapi.lua @ 5412:a5fcda77c6b1

moduleapi: have get_host_items wrap on get_items from modulemanager, also add has_{feature/identity} to the API.
author Marco Cirillo <maranda@lightwitch.org>
date Mon, 01 Apr 2013 23:44:28 +0000
parent 5377:898454038524
child 5434:9dd36e20c1e3
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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"; -- This is necessary to avoid require loops
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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 t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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18 local error, setmetatable, type = error, setmetatable, type;
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19 local ipairs, pairs, select, unpack = ipairs, pairs, select, unpack;
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20 local tonumber, tostring = tonumber, tostring;
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21
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22 local prosody = prosody;
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23 local hosts = prosody.hosts;
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24 local core_post_stanza = prosody.core_post_stanza;
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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 self.host ~= "*" and hosts[self.host].type or nil;
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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 self.global = true;
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54 end
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55
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56 function api:add_feature(xmlns)
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57 self:add_item("feature", xmlns);
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58 end
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59 function api:add_identity(category, type, name)
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60 self:add_item("identity", {category = category, type = type, name = name});
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61 end
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62 function api:add_extension(data)
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63 self:add_item("extension", data);
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64 end
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65 function api:has_feature(xmlns)
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66 for _, feature in ipairs(self:get_host_items("feature")) do
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67 if feature == xmlns then return true; end
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68 end
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69 return false;
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70 end
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71 function api:has_identity(category, type, name)
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72 for _, id in ipairs(self:get_host_items("identity")) do
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73 if id.category == category and id.type == type and id.name == name then
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74 return true;
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75 end
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76 end
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77 return false;
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78 end
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79
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80 function api:fire_event(...)
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81 return (hosts[self.host] or prosody).events.fire_event(...);
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82 end
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83
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84 function api:hook_object_event(object, event, handler, priority)
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85 self.event_handlers:set(object, event, handler, true);
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86 return object.add_handler(event, handler, priority);
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87 end
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88
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89 function api:unhook_object_event(object, event, handler)
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90 return object.remove_handler(event, handler);
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91 end
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92
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93 function api:hook(event, handler, priority)
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94 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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95 end
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96
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97 function api:hook_global(event, handler, priority)
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98 return self:hook_object_event(prosody.events, event, handler, priority);
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99 end
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100
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101 function api:hook_tag(xmlns, name, handler, priority)
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102 if not handler and type(name) == "function" then
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103 -- If only 2 options then they specified no xmlns
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104 xmlns, name, handler, priority = nil, xmlns, name, handler;
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105 elseif not (handler and name) then
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106 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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107 return;
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108 end
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109 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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110 end
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111 api.hook_stanza = api.hook_tag; -- COMPAT w/pre-0.9
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112
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113 function api:require(lib)
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114 local f, n = pluginloader.load_code(self.name, lib..".lib.lua", self.environment);
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115 if not f then
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116 f, n = pluginloader.load_code(lib, lib..".lib.lua", self.environment);
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117 end
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118 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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119 return f();
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120 end
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121
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122 function api:depends(name)
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123 if not self.dependencies then
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124 self.dependencies = {};
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125 self:hook("module-reloaded", function (event)
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126 if self.dependencies[event.module] and not self.reloading then
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127 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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128 modulemanager.reload(self.host, self.name);
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129 return;
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130 end
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131 end);
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132 self:hook("module-unloaded", function (event)
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133 if self.dependencies[event.module] then
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134 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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135 modulemanager.unload(self.host, self.name);
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136 end
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137 end);
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138 end
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139 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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140 if mod and mod.module.host == "*" and self.host ~= "*"
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141 and modulemanager.module_has_method(mod, "add_host") then
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142 mod = nil; -- Target is a shared module, so we still want to load it on our host
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143 end
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144 if not mod then
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145 local err;
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146 mod, err = modulemanager.load(self.host, name);
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147 if not mod then
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148 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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149 end
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150 end
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151 self.dependencies[name] = true;
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152 return mod;
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153 end
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154
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155 -- Returns one or more shared tables at the specified virtual paths
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156 -- Intentionally does not allow the table at a path to be _set_, it
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157 -- is auto-created if it does not exist.
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158 function api:shared(...)
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159 if not self.shared_data then self.shared_data = {}; end
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160 local paths = { n = select("#", ...), ... };
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161 local data_array = {};
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162 local default_path_components = { self.host, self.name };
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163 for i = 1, paths.n do
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164 local path = paths[i];
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165 if path:sub(1,1) ~= "/" then -- Prepend default components
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166 local n_components = select(2, path:gsub("/", "%1"));
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167 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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168 end
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169 local shared = shared_data[path];
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170 if not shared then
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171 shared = {};
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172 if path:match("%-cache$") then
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173 setmetatable(shared, { __mode = "kv" });
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174 end
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175 shared_data[path] = shared;
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176 end
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177 t_insert(data_array, shared);
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178 self.shared_data[path] = shared;
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179 end
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180 return unpack(data_array);
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181 end
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182
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183 function api:get_option(name, default_value)
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184 local value = config.get(self.host, name);
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185 if value == nil then
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186 value = default_value;
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187 end
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188 return value;
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189 end
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190
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191 function api:get_option_string(name, default_value)
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192 local value = self:get_option(name, default_value);
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193 if type(value) == "table" then
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194 if #value > 1 then
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195 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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196 end
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197 value = value[1];
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198 end
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199 if value == nil then
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200 return nil;
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201 end
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202 return tostring(value);
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203 end
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204
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205 function api:get_option_number(name, ...)
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206 local value = self:get_option(name, ...);
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207 if type(value) == "table" then
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208 if #value > 1 then
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209 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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210 end
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211 value = value[1];
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212 end
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213 local ret = tonumber(value);
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214 if value ~= nil and ret == nil then
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215 self:log("error", "Config option '%s' not understood, expecting a number", name);
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216 end
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217 return ret;
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218 end
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219
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220 function api:get_option_boolean(name, ...)
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221 local value = self:get_option(name, ...);
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222 if type(value) == "table" then
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223 if #value > 1 then
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224 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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225 end
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226 value = value[1];
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227 end
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228 if value == nil then
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229 return nil;
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230 end
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231 local ret = value == true or value == "true" or value == 1 or nil;
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232 if ret == nil then
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233 ret = (value == false or value == "false" or value == 0);
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234 if ret then
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235 ret = false;
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236 else
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237 ret = nil;
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238 end
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239 end
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240 if ret == nil then
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241 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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242 end
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243 return ret;
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244 end
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245
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246 function api:get_option_array(name, ...)
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247 local value = self:get_option(name, ...);
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248
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249 if value == nil then
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250 return nil;
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251 end
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252
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253 if type(value) ~= "table" then
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254 return array{ value }; -- Assume any non-list is a single-item list
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255 end
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256
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257 return array():append(value); -- Clone
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258 end
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259
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260 function api:get_option_set(name, ...)
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261 local value = self:get_option_array(name, ...);
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262
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263 if value == nil then
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264 return nil;
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265 end
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266
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267 return set.new(value);
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268 end
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269
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270 function api:add_item(key, value)
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271 self.items = self.items or {};
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272 self.items[key] = self.items[key] or {};
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273 t_insert(self.items[key], value);
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274 self:fire_event("item-added/"..key, {source = self, item = value});
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275 end
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276 function api:remove_item(key, value)
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277 local t = self.items and self.items[key] or NULL;
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278 for i = #t,1,-1 do
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279 if t[i] == value then
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280 t_remove(self.items[key], i);
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281 self:fire_event("item-removed/"..key, {source = self, item = value});
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282 return value;
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283 end
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284 end
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285 end
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286
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287 function api:get_host_items(key)
5412
a5fcda77c6b1 moduleapi: have get_host_items wrap on get_items from modulemanager, also add has_{feature/identity} to the API.
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parents: 5377
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288 local result = modulemanager.get_items(key, self.host) or {};
4531
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289 return result;
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290 end
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291
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292 function api:handle_items(type, added_cb, removed_cb, existing)
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293 self:hook("item-added/"..type, added_cb);
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294 self:hook("item-removed/"..type, removed_cb);
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295 if existing ~= false then
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296 for _, item in ipairs(self:get_host_items(type)) do
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297 added_cb({ item = item });
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298 end
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299 end
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300 end
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301
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302 function api:provides(name, item)
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303 if not item then item = self.environment; end
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304 if not item.name then
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96b40b5e8ea8 moduleapi: module:provides(): Fix usage of wrong table
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305 local item_name = self.name;
4613
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306 -- Strip a provider prefix to find the item name
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307 -- (e.g. "auth_foo" -> "foo" for an auth provider)
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diff changeset
308 if item_name:find(name.."_", 1, true) == 1 then
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309 item_name = item_name:sub(#name+2);
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310 end
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311 item.name = item_name;
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312 end
4661
76db5d0a2104 moduleapi: module:provides(): Add "-provider" onto the key name
Matthew Wild <mwild1@gmail.com>
parents: 4660
diff changeset
313 self:add_item(name.."-provider", item);
4613
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parents: 4605
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314 end
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parents: 4605
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315
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20940729c1b4 moduleapi: Add module:send() as an alias for core_post_stanza() from the current host's origin
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parents: 4613
diff changeset
316 function api:send(stanza)
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parents: 4613
diff changeset
317 return core_post_stanza(hosts[self.host], stanza);
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parents: 4613
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318 end
20940729c1b4 moduleapi: Add module:send() as an alias for core_post_stanza() from the current host's origin
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parents: 4613
diff changeset
319
4666
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parents: 4663
diff changeset
320 function api:add_timer(delay, callback)
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parents: 4663
diff changeset
321 return timer.add_task(delay, function (t)
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parents: 4663
diff changeset
322 if self.loaded == false then return; end
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parents: 4663
diff changeset
323 return callback(t);
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parents: 4663
diff changeset
324 end);
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parents: 4663
diff changeset
325 end
fb522fbd495e moduleapi: Add module:add_timer(delay, callback) - automatically halts the timer on module unload
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parents: 4663
diff changeset
326
4790
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
327 local path_sep = package.config:sub(1,1);
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
328 function api:get_directory()
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Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
329 return self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
330 end
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Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
331
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
332 function api:load_resource(path, mode)
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
333 path = config.resolve_relative_path(self:get_directory(), path);
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
334 return io.open(path, mode);
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parents: 4750
diff changeset
335 end
8bf710b19f65 moduleapi: Add module:get_directory() to get module file's directory, and module:load_resource() to load a file relative to that directory
Matthew Wild <mwild1@gmail.com>
parents: 4750
diff changeset
336
5053
375ab71e4b37 moduleapi: If path name ends with '-cache' create table as weak (keys and values)
Matthew Wild <mwild1@gmail.com>
parents: 5024
diff changeset
337 return api;