core/configmanager.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 local _G = _G;
  12 local   setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, format =
  13                 setmetatable, loadfile, pcall, rawget, rawset, io, error, dofile, type, pairs, table, string.format;
  14
  15
  16 local trb = debug.traceback
  17
  18 local eventmanager = require "core.eventmanager";
  19
  20 module "configmanager"
  21
  22 local parsers = {};
  23
  24 local config = { ["*"] = { core = {} } };
  25
  26 local global_config = config["*"];
  27
  28 -- When host not found, use global
  29 setmetatable(config, { __index = function () return global_config; end});
  30 local host_mt = { __index = global_config };
  31
  32 -- When key not found in section, check key in global's section
  33 function section_mt(section_name)
  34         return { __index =      function (t, k)
  35                                                                         local section = rawget(global_config, section_name);
  36                                                                         if not section then return nil; end
  37                                                                         return section[k];
  38                                                         end };
  39 end
  40
  41 function getconfig()
  42         return config;
  43 end
  44
  45 function get(host, section, key)
  46         local sec = config[host][section];
  47         if sec then
  48                 return sec[key];
  49         end
  50         return nil;
  51 end
  52
  53 function set(host, section, key, value)
  54         if host and section and key then
  55                 local hostconfig = rawget(config, host);
  56                 if not hostconfig then
  57                         hostconfig = rawset(config, host, setmetatable({}, host_mt))[host];
  58                 end
  59                 if not rawget(hostconfig, section) then
  60                         hostconfig[section] = setmetatable({}, section_mt(section));
  61                 end
  62                 hostconfig[section][key] = value;
  63                 return true;
  64         end
  65         return false;
  66 end
  67
  68 function load(filename, format)
  69         format = format or filename:match("%w+$");
  70
  71         if parsers[format] and parsers[format].load then
  72                 local f, err = io.open(filename);
  73                 if f then
  74                         local ok, err = parsers[format].load(f:read("*a"), filename);
  75                         f:close();
  76                         if ok then
  77                                 eventmanager.fire_event("config-reloaded", { filename = filename, format = format });
  78                         end
  79                         return ok, "parser", err;
  80                 end
  81                 return f, "file", err;
  82         end
  83
  84         if not format then
  85                 return nil, "file", "no parser specified";
  86         else
  87                 return nil, "file", "no parser for "..(format);
  88         end
  89 end
  90
  91 function save(filename, format)
  92 end
  93
  94 function addparser(format, parser)
  95         if format and parser then
  96                 parsers[format] = parser;
  97         end
  98 end
  99
 100 -- _M needed to avoid name clash with local 'parsers'
 101 function _M.parsers()
 102         local p = {};
 103         for format in pairs(parsers) do
 104                 table.insert(p, format);
 105         end
 106         return p;
 107 end
 108
 109 -- Built-in Lua parser
 110 do
 111         local loadstring, pcall, setmetatable = _G.loadstring, _G.pcall, _G.setmetatable;
 112         local setfenv, rawget, tostring = _G.setfenv, _G.rawget, _G.tostring;
 113         parsers.lua = {};
 114         function parsers.lua.load(data, filename)
 115                 local env;
 116                 -- The ' = true' are needed so as not to set off __newindex when we assign the functions below
 117                 env = setmetatable({ Host = true; host = true; Component = true, component = true,
 118                                                         Include = true, include = true, RunScript = dofile }, { __index = function (t, k)
 119                                                                                                 return rawget(_G, k) or
 120                                                                                                                 function (settings_table)
 121                                                                                                                         config[__currenthost or "*"][k] = settings_table;
 122                                                                                                                 end;
 123                                                                                 end,
 124                                                                 __newindex = function (t, k, v)
 125                                                                                         set(env.__currenthost or "*", "core", k, v);
 126                                                                                 end});
 127
 128                 rawset(env, "__currenthost", "*") -- Default is global
 129                 function env.Host(name)
 130                         if rawget(config, name) and rawget(config[name].core, "component_module") then
 131                                 error(format("Host %q clashes with previously defined %s Component %q, for services use a sub-domain like conference.%s",
 132                                         name, config[name].core.component_module:gsub("^%a+$", { component = "external", muc = "MUC"}), name, name), 0);
 133                         end
 134                         rawset(env, "__currenthost", name);
 135                         -- Needs at least one setting to logically exist :)
 136                         set(name or "*", "core", "defined", true);
 137                 end
 138                 env.host = env.Host;
 139
 140                 function env.Component(name)
 141                         if rawget(config, name) and rawget(config[name].core, "defined") and not rawget(config[name].core, "component_module") then
 142                                 error(format("Component %q clashes with previously defined Host %q, for services use a sub-domain like conference.%s",
 143                                         name, name, name), 0);
 144                         end
 145                         set(name, "core", "component_module", "component");
 146                         -- Don't load the global modules by default
 147                         set(name, "core", "load_global_modules", false);
 148                         rawset(env, "__currenthost", name);
 149
 150                         return function (module)
 151                                         if type(module) == "string" then
 152                                                 set(name, "core", "component_module", module);
 153                                         end
 154                                 end
 155                 end
 156                 env.component = env.Component;
 157
 158                 function env.Include(file)
 159                         local f, err = io.open(file);
 160                         if f then
 161                                 local data = f:read("*a");
 162                                 local ok, err = parsers.lua.load(data, file);
 163                                 if not ok then error(err:gsub("%[string.-%]", file), 0); end
 164                         end
 165                         if not f then error("Error loading included "..file..": "..err, 0); end
 166                         return f, err;
 167                 end
 168                 env.include = env.Include;
 169
 170                 local chunk, err = loadstring(data, "@"..filename);
 171
 172                 if not chunk then
 173                         return nil, err;
 174                 end
 175
 176                 setfenv(chunk, env);
 177
 178                 local ok, err = pcall(chunk);
 179
 180                 if not ok then
 181                         return nil, err;
 182                 end
 183
 184                 return true;
 185         end
 186
 187 end
 188
 189 return _M;