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'use strict';
const { codes } = require('internal/errors');
const { UDP } = internalBinding('udp_wrap');
const { guessHandleType } = internalBinding('util');
const { isInt32 } = require('internal/validators');
const { UV_EINVAL } = internalBinding('uv');
const { ERR_INVALID_ARG_TYPE, ERR_SOCKET_BAD_TYPE } = codes;
const kStateSymbol = Symbol('state symbol');
let dns; // Lazy load for startup performance.
function lookup4(lookup, address, callback) {
return lookup(address || '127.0.0.1', 4, callback);
}
function lookup6(lookup, address, callback) {
return lookup(address || '::1', 6, callback);
}
function newHandle(type, lookup) {
if (lookup === undefined) {
if (dns === undefined) {
dns = require('dns');
}
lookup = dns.lookup;
} else if (typeof lookup !== 'function') {
throw new ERR_INVALID_ARG_TYPE('lookup', 'Function', lookup);
}
if (type === 'udp4') {
const handle = new UDP();
handle.lookup = lookup4.bind(handle, lookup);
return handle;
}
if (type === 'udp6') {
const handle = new UDP();
handle.lookup = lookup6.bind(handle, lookup);
handle.bind = handle.bind6;
handle.connect = handle.connect6;
handle.send = handle.send6;
return handle;
}
throw new ERR_SOCKET_BAD_TYPE();
}
function _createSocketHandle(address, port, addressType, fd, flags) {
const handle = newHandle(addressType);
let err;
if (isInt32(fd) && fd > 0) {
const type = guessHandleType(fd);
if (type !== 'UDP') {
err = UV_EINVAL;
} else {
err = handle.open(fd);
}
} else if (port || address) {
err = handle.bind(address, port || 0, flags);
}
if (err) {
handle.close();
return err;
}
return handle;
}
module.exports = {
kStateSymbol,
_createSocketHandle,
newHandle
};