-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

if not (prosody and prosody.config_loaded) then

	-- This module only supports loading inside Prosody, outside Prosody

	-- you should directly require net.server_select or server_event, etc.

	error(debug.traceback("Loading outside Prosody or Prosody not yet initialized"), 0);

end

local log = require "util.logger".init("net.server");

local default_backend = "epoll";

local server_type = require "core.configmanager".get("*", "network_backend") or default_backend;

if require "core.configmanager".get("*", "use_libevent") then

	server_type = "event";

end

if server_type == "event" then

	if not pcall(require, "luaevent.core") then

		log("error", "libevent not found, falling back to %s", default_backend);

		server_type = default_backend;

	end

end

local server;

local set_config;

if server_type == "event" then

	server = require "net.server_event";

	local defaults = {};

	for k,v in pairs(server.cfg) do

		defaults[k] = v;

	end

	function set_config(settings)

		local event_settings = {

			ACCEPT_DELAY = settings.accept_retry_interval;

			ACCEPT_QUEUE = settings.tcp_backlog;

			CLEAR_DELAY = settings.event_clear_interval;

			CONNECT_TIMEOUT = settings.connect_timeout;

			DEBUG = settings.debug;

			HANDSHAKE_TIMEOUT = settings.ssl_handshake_timeout;

			MAX_CONNECTIONS = settings.max_connections;

			MAX_HANDSHAKE_ATTEMPTS = settings.max_ssl_handshake_roundtrips;

			MAX_READ_LENGTH = settings.max_receive_buffer_size;

			MAX_SEND_LENGTH = settings.max_send_buffer_size;

			READ_TIMEOUT = settings.read_timeout;

			WRITE_TIMEOUT = settings.send_timeout;

		};

		for k,default in pairs(defaults) do

			server.cfg[k] = event_settings[k] or default;

		end

	end

elseif server_type == "select" then

	-- TODO Remove completely.

	log("warn", "select is deprecated, the new default is epoll. For more info see https://prosody.im/doc/network_backend");

	server = require "net.server_select";

	local defaults = {};

	for k,v in pairs(server.getsettings()) do

		defaults[k] = v;

	end

	function set_config(settings)

		local select_settings = {};

		for k,default in pairs(defaults) do

			select_settings[k] = settings[k] or default;

		end

		server.changesettings(select_settings);

	end

else

	server = require("net.server_"..server_type);

	set_config = server.set_config;

	if not server.get_backend then

		function server.get_backend()

			return server_type;

		end

	end

end

-- If server.hook_signal exists, replace signal.signal()

local has_signal, signal = pcall(require, "util.signal");

if has_signal then

	if server.hook_signal then

		function signal.signal(signal_id, handler)

			if type(signal_id) == "string" then

				signal_id = signal[signal_id:upper()];

			end

			if type(signal_id) ~= "number" then

				return false, "invalid-signal";

			end

			return server.hook_signal(signal_id, handler);

		end

	else

		server.hook_signal = signal.signal;

	end

else

	if not server.hook_signal then

		server.hook_signal = function()

			return false, "signal hooking not supported"

		end

	end

end

if prosody and set_config then

	local config_get = require "core.configmanager".get;

	local function load_config()

		local settings = config_get("*", "network_settings") or {};

		return set_config(settings);

	end

	load_config();

	prosody.events.add_handler("config-reloaded", load_config);

end

-- require "net.server" shall now forever return this,

-- ie. server_select or server_event as chosen above.

return server;