Annotate

core/moduleapi.lua @ 5077:6c2c8bf36d22

moduleapi: Clarify comment
author Matthew Wild <mwild1@gmail.com>
date Fri, 03 Aug 2012 14:07:41 +0100
parent 5053:375ab71e4b37
child 5161:3275a9705ef3
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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 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
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66 function api:fire_event(...)
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67 return (hosts[self.host] or prosody).events.fire_event(...);
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68 end
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69
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70 function api:hook_object_event(object, event, handler, priority)
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71 self.event_handlers:set(object, event, handler, true);
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72 return object.add_handler(event, handler, priority);
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73 end
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74
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75 function api:unhook_object_event(object, event, handler)
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76 return object.remove_handler(event, handler);
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77 end
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78
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79 function api:hook(event, handler, priority)
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80 return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
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81 end
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82
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83 function api:hook_global(event, handler, priority)
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84 return self:hook_object_event(prosody.events, event, handler, priority);
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85 end
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86
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87 function api:hook_tag(xmlns, name, handler, priority)
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88 if not handler and type(name) == "function" then
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89 -- If only 2 options then they specified no xmlns
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90 xmlns, name, handler, priority = nil, xmlns, name, handler;
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91 elseif not (handler and name) then
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92 self:log("warn", "Error: Insufficient parameters to module:hook_stanza()");
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93 return;
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94 end
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95 return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name, function (data) return handler(data.origin, data.stanza, data); end, priority);
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96 end
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97 api.hook_stanza = api.hook_tag; -- COMPAT w/pre-0.9
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98
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99 function api:require(lib)
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100 local f, n = pluginloader.load_code(self.name, lib..".lib.lua", self.environment);
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101 if not f then
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102 f, n = pluginloader.load_code(lib, lib..".lib.lua", self.environment);
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103 end
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104 if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
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105 return f();
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106 end
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107
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108 function api:depends(name)
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109 if not self.dependencies then
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110 self.dependencies = {};
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111 self:hook("module-reloaded", function (event)
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112 if self.dependencies[event.module] and not self.reloading then
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113 self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
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114 modulemanager.reload(self.host, self.name);
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115 return;
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116 end
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117 end);
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118 self:hook("module-unloaded", function (event)
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119 if self.dependencies[event.module] then
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120 self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
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121 modulemanager.unload(self.host, self.name);
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122 end
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123 end);
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124 end
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125 local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
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126 if mod and mod.module.host == "*" and self.host ~= "*"
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127 and modulemanager.module_has_method(mod, "add_host") then
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128 mod = nil; -- Target is a shared module, so we still want to load it on our host
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129 end
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130 if not mod then
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131 local err;
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132 mod, err = modulemanager.load(self.host, name);
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133 if not mod then
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134 return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
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135 end
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136 end
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137 self.dependencies[name] = true;
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138 return mod;
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139 end
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140
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141 -- Returns one or more shared tables at the specified virtual paths
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142 -- Intentionally does not allow the table at a path to be _set_, it
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143 -- is auto-created if it does not exist.
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144 function api:shared(...)
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145 if not self.shared_data then self.shared_data = {}; end
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146 local paths = { n = select("#", ...), ... };
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147 local data_array = {};
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148 local default_path_components = { self.host, self.name };
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149 for i = 1, paths.n do
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150 local path = paths[i];
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151 if path:sub(1,1) ~= "/" then -- Prepend default components
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152 local n_components = select(2, path:gsub("/", "%1"));
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153 path = (n_components<#default_path_components and "/" or "")..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
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154 end
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155 local shared = shared_data[path];
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156 if not shared then
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157 shared = {};
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158 if path:match("%-cache$") then
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159 setmetatable(shared, { __mode = "kv" });
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160 end
4539
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161 shared_data[path] = shared;
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162 end
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163 t_insert(data_array, shared);
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164 self.shared_data[path] = shared;
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165 end
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166 return unpack(data_array);
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167 end
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168
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169 function api:get_option(name, default_value)
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170 local value = config.get(self.host, self.name, name);
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171 if value == nil then
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172 value = config.get(self.host, "core", name);
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173 if value == nil then
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174 value = default_value;
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175 end
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176 end
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177 return value;
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178 end
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179
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180 function api:get_option_string(name, default_value)
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181 local value = self:get_option(name, default_value);
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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 if value == nil then
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189 return nil;
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190 end
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191 return tostring(value);
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192 end
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193
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194 function api:get_option_number(name, ...)
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195 local value = self:get_option(name, ...);
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196 if type(value) == "table" then
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197 if #value > 1 then
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198 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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199 end
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200 value = value[1];
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201 end
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202 local ret = tonumber(value);
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203 if value ~= nil and ret == nil then
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204 self:log("error", "Config option '%s' not understood, expecting a number", name);
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205 end
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206 return ret;
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207 end
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208
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209 function api:get_option_boolean(name, ...)
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210 local value = self:get_option(name, ...);
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211 if type(value) == "table" then
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212 if #value > 1 then
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213 self:log("error", "Config option '%s' does not take a list, using just the first item", name);
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214 end
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215 value = value[1];
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216 end
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217 if value == nil then
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218 return nil;
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219 end
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220 local ret = value == true or value == "true" or value == 1 or nil;
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221 if ret == nil then
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222 ret = (value == false or value == "false" or value == 0);
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223 if ret then
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224 ret = false;
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225 else
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226 ret = nil;
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227 end
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228 end
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229 if ret == nil then
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230 self:log("error", "Config option '%s' not understood, expecting true/false", name);
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231 end
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232 return ret;
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233 end
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234
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235 function api:get_option_array(name, ...)
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236 local value = self:get_option(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 if type(value) ~= "table" then
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243 return array{ value }; -- Assume any non-list is a single-item list
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244 end
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245
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246 return array():append(value); -- Clone
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247 end
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248
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249 function api:get_option_set(name, ...)
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250 local value = self:get_option_array(name, ...);
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251
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252 if value == nil then
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253 return nil;
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254 end
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255
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256 return set.new(value);
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257 end
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258
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259 function api:add_item(key, value)
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260 self.items = self.items or {};
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261 self.items[key] = self.items[key] or {};
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262 t_insert(self.items[key], value);
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263 self:fire_event("item-added/"..key, {source = self, item = value});
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264 end
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265 function api:remove_item(key, value)
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266 local t = self.items and self.items[key] or NULL;
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267 for i = #t,1,-1 do
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268 if t[i] == value then
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269 t_remove(self.items[key], i);
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270 self:fire_event("item-removed/"..key, {source = self, item = value});
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271 return value;
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272 end
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273 end
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274 end
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275
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276 function api:get_host_items(key)
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277 local result = {};
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278 for mod_name, module in pairs(modulemanager.get_modules(self.host)) do
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279 module = module.module;
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280 if module.items then
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281 for _, item in ipairs(module.items[key] or NULL) do
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282 t_insert(result, item);
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283 end
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284 end
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285 end
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286 for mod_name, module in pairs(modulemanager.get_modules("*")) do
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287 module = module.module;
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288 if module.items then
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289 for _, item in ipairs(module.items[key] or NULL) do
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290 t_insert(result, item);
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291 end
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292 end
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293 end
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294 return result;
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295 end
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296
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297 function api:handle_items(type, added_cb, removed_cb, existing)
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298 self:hook("item-added/"..type, added_cb);
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299 self:hook("item-removed/"..type, removed_cb);
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300 if existing ~= false then
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301 for _, item in ipairs(self:get_host_items(type)) do
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302 added_cb({ item = item });
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303 end
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304 end
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305 end
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306
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307 function api:provides(name, item)
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308 if not item then item = self.environment; end
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309 if not item.name then
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310 local item_name = self.name;
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311 -- Strip a provider prefix to find the item name
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312 -- (e.g. "auth_foo" -> "foo" for an auth provider)
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313 if item_name:find(name.."_", 1, true) == 1 then
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314 item_name = item_name:sub(#name+2);
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315 end
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316 item.name = item_name;
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317 end
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318 self:add_item(name.."-provider", item);
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319 end
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320
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321 function api:send(stanza)
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322 return core_post_stanza(hosts[self.host], stanza);
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323 end
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324
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325 function api:add_timer(delay, callback)
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326 return timer.add_task(delay, function (t)
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327 if self.loaded == false then return; end
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328 return callback(t);
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329 end);
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330 end
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331
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332 local path_sep = package.config:sub(1,1);
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333 function api:get_directory()
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334 return self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
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335 end
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336
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337 function api:load_resource(path, mode)
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338 path = config.resolve_relative_path(self:get_directory(), path);
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339 return io.open(path, mode);
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340 end
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341
5053
375ab71e4b37 moduleapi: If path name ends with '-cache' create table as weak (keys and values)
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diff changeset
342 return api;