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core/modulemanager.lua @ 439:6608ad3a72f3
is_loaded() and incomplete unload() for modules
author | Matthew Wild <mwild1@gmail.com> |
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date | Thu, 27 Nov 2008 16:52:30 +0000 |
parent | 438:193f9dd64f17 |
child | 467:66f145f5c932 |
rev | line source |
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30 | 1 |
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2 |
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3 local logger = require "util.logger"; |
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4 local log = logger.init("modulemanager") |
30 | 5 |
6 local loadfile, pcall = loadfile, pcall; | |
7 local setmetatable, setfenv, getfenv = setmetatable, setfenv, getfenv; | |
8 local pairs, ipairs = pairs, ipairs; | |
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9 local t_insert = table.insert; |
30 | 10 local type = type; |
11 | |
12 local tostring, print = tostring, print; | |
13 | |
14 local _G = _G; | |
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15 local debug = debug; |
30 | 16 |
17 module "modulemanager" | |
18 | |
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19 local api = {}; -- Module API container |
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20 |
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21 local modulemap = {}; |
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22 |
30 | 23 local handler_info = {}; |
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24 local stanza_handlers = {}; |
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25 |
30 | 26 local modulehelpers = setmetatable({}, { __index = _G }); |
27 | |
28 | |
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29 function load(host, module_name, config) |
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30 if not (host and module_name) then |
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31 return nil, "insufficient-parameters"; |
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32 end |
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33 local mod, err = loadfile("plugins/mod_"..module_name..".lua"); |
30 | 34 if not mod then |
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35 log("error", "Unable to load module '%s': %s", module_name or "nil", err or "nil"); |
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36 return nil, err; |
30 | 37 end |
38 | |
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39 if not modulemap[host] then |
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40 modulemap[host] = {}; |
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41 stanza_handlers[host] = {}; |
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42 elseif modulemap[host][module_name] then |
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43 log("warn", "%s is already loaded for %s, so not loading again", module_name, host); |
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44 return nil, "module-already-loaded"; |
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45 end |
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46 |
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47 local _log = logger.init(host..":"..module_name); |
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48 local api_instance = setmetatable({ name = module_name, host = host, config = config, _log = _log, log = function (self, ...) return _log(...); end }, { __index = api }); |
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49 |
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50 local pluginenv = setmetatable({ module = api_instance }, { __index = _G }); |
30 | 51 |
52 setfenv(mod, pluginenv); | |
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53 |
30 | 54 local success, ret = pcall(mod); |
55 if not success then | |
56 log("error", "Error initialising module '%s': %s", name or "nil", ret or "nil"); | |
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57 return nil, ret; |
30 | 58 end |
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59 |
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60 modulemap[host][module_name] = mod; |
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61 |
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62 return true; |
30 | 63 end |
64 | |
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65 function is_loaded(host, name) |
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66 return modulemap[host] and modulemap[host][name] and true; |
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67 end |
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68 |
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69 function unload(host, name, ...) |
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70 local mod = modulemap[host] and modulemap[host][name]; |
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71 if not mod then return nil, "module-not-loaded"; end |
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72 |
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73 if type(mod.unload) == "function" then |
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74 local ok, err = pcall(mod.unload, ...) |
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75 if (not ok) and err then |
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76 log("warn", "Non-fatal error unloading module '%s' from '%s': %s", name, host, err); |
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77 end |
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78 end |
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79 |
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80 end |
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81 |
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82 function handle_stanza(host, origin, stanza) |
38 | 83 local name, xmlns, origin_type = stanza.name, stanza.attr.xmlns, origin.type; |
30 | 84 |
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85 local handlers = stanza_handlers[host]; |
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86 if not handlers then |
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87 log("warn", "No handlers for %s", host); |
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88 return false; |
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89 end |
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90 |
38 | 91 if name == "iq" and xmlns == "jabber:client" and handlers[origin_type] then |
30 | 92 local child = stanza.tags[1]; |
93 if child then | |
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94 local xmlns = child.attr.xmlns or xmlns; |
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95 log("debug", "Stanza of type %s from %s has xmlns: %s", name, origin_type, xmlns); |
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96 local handler = handlers[origin_type][name] and handlers[origin_type][name][xmlns]; |
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97 if handler then |
30 | 98 log("debug", "Passing stanza to mod_%s", handler_info[handler].name); |
99 return handler(origin, stanza) or true; | |
100 end | |
101 end | |
38 | 102 elseif handlers[origin_type] then |
103 local handler = handlers[origin_type][name]; | |
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104 if handler then |
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105 handler = handler[xmlns]; |
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106 if handler then |
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107 log("debug", "Passing stanza to mod_%s", handler_info[handler].name); |
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108 return handler(origin, stanza) or true; |
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109 end |
38 | 110 end |
30 | 111 end |
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112 log("debug", "Stanza unhandled by any modules, xmlns: %s", stanza.attr.xmlns); |
30 | 113 return false; -- we didn't handle it |
114 end | |
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115 |
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116 ----- API functions exposed to modules ----------- |
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117 -- Must all be in api.* |
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118 |
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119 -- Returns the name of the current module |
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120 function api:get_name() |
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121 return self.name; |
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122 end |
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123 |
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124 -- Returns the host that the current module is serving |
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125 function api:get_host() |
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126 return self.host; |
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127 end |
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128 |
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129 |
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130 local function _add_iq_handler(module, origin_type, xmlns, handler) |
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131 local handlers = stanza_handlers[module.host]; |
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132 handlers[origin_type] = handlers[origin_type] or {}; |
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133 handlers[origin_type].iq = handlers[origin_type].iq or {}; |
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134 if not handlers[origin_type].iq[xmlns] then |
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135 handlers[origin_type].iq[xmlns]= handler; |
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136 handler_info[handler] = module; |
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137 module:log("debug", "I now handle tag 'iq' [%s] with payload namespace '%s'", origin_type, xmlns); |
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138 else |
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139 module:log("warn", "I wanted to handle tag 'iq' [%s] with payload namespace '%s' but mod_%s already handles that", origin_type, xmlns, handler_info[handlers[origin_type].iq[xmlns]].name); |
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140 end |
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141 end |
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142 |
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143 function api:add_iq_handler(origin_type, xmlns, handler) |
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144 if not (origin_type and handler and xmlns) then return false; end |
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145 if type(origin_type) == "table" then |
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146 for _, origin_type in ipairs(origin_type) do |
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147 _add_iq_handler(self, origin_type, xmlns, handler); |
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148 end |
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149 return; |
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150 end |
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151 _add_iq_handler(self, origin_type, xmlns, handler); |
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152 end |
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153 |
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154 |
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155 do |
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156 local event_handlers = {}; |
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157 |
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158 function api:add_event_hook(name, handler) |
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159 if not event_handlers[name] then |
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160 event_handlers[name] = {}; |
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161 end |
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162 t_insert(event_handlers[name] , handler); |
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163 self:log("debug", "Subscribed to %s", name); |
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164 end |
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165 |
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166 function fire_event(name, ...) |
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167 local event_handlers = event_handlers[name]; |
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168 if event_handlers then |
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169 for name, handler in ipairs(event_handlers) do |
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170 handler(...); |
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171 end |
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172 end |
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173 end |
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174 end |
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175 |
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176 |
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177 local function _add_handler(module, origin_type, tag, xmlns, handler) |
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178 local handlers = stanza_handlers[module.host]; |
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179 handlers[origin_type] = handlers[origin_type] or {}; |
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180 if not handlers[origin_type][tag] then |
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181 handlers[origin_type][tag] = handlers[origin_type][tag] or {}; |
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182 handlers[origin_type][tag][xmlns]= handler; |
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183 handler_info[handler] = module; |
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184 module:log("debug", "I now handle tag '%s' [%s] with xmlns '%s'", tag, origin_type, xmlns); |
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185 elseif handler_info[handlers[origin_type][tag]] then |
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186 log("warning", "I wanted to handle tag '%s' [%s] but mod_%s already handles that", tag, origin_type, handler_info[handlers[origin_type][tag]].module.name); |
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187 end |
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188 end |
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189 |
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190 function api:add_handler(origin_type, tag, xmlns, handler) |
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191 if not (origin_type and tag and xmlns and handler) then return false; end |
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192 if type(origin_type) == "table" then |
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193 for _, origin_type in ipairs(origin_type) do |
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194 _add_handler(self, origin_type, tag, xmlns, handler); |
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195 end |
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196 return; |
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197 end |
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198 _add_handler(self, origin_type, tag, xmlns, handler); |
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199 end |
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200 |
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201 -------------------------------------------------------------------- |
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202 |
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203 return _M; |