[prosody.git] / core / componentmanager.lua

-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local prosody = prosody;
local log = require "util.logger".init("componentmanager");
local configmanager = require "core.configmanager";
local modulemanager = require "core.modulemanager";
local core_route_stanza = core_route_stanza;
local jid_split = require "util.jid".split;
local events_new = require "util.events".new;
local st = require "util.stanza";
local hosts = hosts;
local serialize = require "util.serialization".serialize

local pairs, type, tostring = pairs, type, tostring;

local components = {};

local disco_items = require "util.multitable".new();
local NULL = {};

prosody.events.add_handler("server-starting", function () core_route_stanza = _G.core_route_stanza; end);

module "componentmanager"

local function default_component_handler(origin, stanza)
        log("warn", "Stanza being handled by default component, bouncing error");
        if stanza.attr.type ~= "error" then
                core_route_stanza(nil, st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable"));
        end
end

local components_loaded_once;
function load_enabled_components(config)
        local defined_hosts = config or configmanager.getconfig();
                
        for host, host_config in pairs(defined_hosts) do
                if host ~= "*" and ((host_config.core.enabled == nil or host_config.core.enabled) and type(host_config.core.component_module) == "string") then
                        hosts[host] = { type = "component", host = host, connected = false, s2sout = {}, events = events_new() };
                        components[host] = default_component_handler;
                        local ok, err = modulemanager.load(host, host_config.core.component_module);
                        if not ok then
                                log("error", "Error loading %s component %s: %s", tostring(host_config.core.component_module), tostring(host), tostring(err));
                        else
                                log("debug", "Activated %s component: %s", host_config.core.component_module, host);
                        end
                end
        end
end

prosody.events.add_handler("server-starting", load_enabled_components);

function handle_stanza(origin, stanza)
        local node, host = jid_split(stanza.attr.to);
        local component = nil;
        if host then
                if node then component = components[node.."@"..host]; end -- hack to allow hooking node@server
                if not component then component = components[host]; end
        end
        if component then
                log("debug", "%s stanza being handled by component: %s", stanza.name, host);
                component(origin, stanza, hosts[host]);
        else
                log("error", "Component manager recieved a stanza for a non-existing component: " .. (stanza.attr.to or serialize(stanza)));
        end
end

function create_component(host, component)
        -- TODO check for host well-formedness
        return { type = "component", host = host, connected = true, s2sout = {}, events = events_new() };
end

function register_component(host, component, session)
        if not hosts[host] or (hosts[host].type == 'component' and not hosts[host].connected) then
                local old_events = hosts[host] and hosts[host].events;

                components[host] = component;
                hosts[host] = session or create_component(host, component);
                
                -- Add events object if not already one
                if not hosts[host].events then
                        hosts[host].events = old_events or events_new();
                end
                
                -- add to disco_items
                if not(host:find("@", 1, true) or host:find("/", 1, true)) and host:find(".", 1, true) then
                        disco_items:set(host:sub(host:find(".", 1, true)+1), host, true);
                end
                -- FIXME only load for a.b.c if b.c has dialback, and/or check in config
                modulemanager.load(host, "dialback");
                log("debug", "component added: "..host);
                return session or hosts[host];
        else
                log("error", "Attempt to set component for existing host: "..host);
        end
end

function deregister_component(host)
        if components[host] then
                modulemanager.unload(host, "dialback");
                hosts[host].connected = nil;
                local host_config = configmanager.getconfig()[host];
                if host_config and ((host_config.core.enabled == nil or host_config.core.enabled) and type(host_config.core.component_module) == "string") then
                        -- Set default handler
                        components[host] = default_component_handler;
                else
                        -- Component not in config, or disabled, remove
                        hosts[host] = nil;
                        components[host] = nil;
                end
                -- remove from disco_items
                if not(host:find("@", 1, true) or host:find("/", 1, true)) and host:find(".", 1, true) then
                        disco_items:remove(host:sub(host:find(".", 1, true)+1), host);
                end
                log("debug", "component removed: "..host);
                return true;
        else
                log("error", "Attempt to remove component for non-existing host: "..host);
        end
end

function set_component_handler(host, handler)
        components[host] = handler;
end

function get_children(host)
        return disco_items:get(host) or NULL;
end

return _M;