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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and other Node contributors.//// Permission is hereby granted, free of charge, to any person obtaining a// copy of this software and associated documentation files (the// "Software"), to deal in the Software without restriction, including// without limitation the rights to use, copy, modify, merge, publish,// distribute, sublicense, and/or sell copies of the Software, and to permit// persons to whom the Software is furnished to do so, subject to the// following conditions://// The above copyright notice and this permission notice shall be included// in all copies or substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE// USE OR OTHER DEALINGS IN THE SOFTWARE.
import { lookup as defaultLookup } from "../dns.ts";import { isInt32, validateFunction } from "./validators.mjs";import type { ErrnoException } from "./errors.ts";import { ERR_SOCKET_BAD_TYPE } from "./errors.ts";import { UDP } from "../internal_binding/udp_wrap.ts";import { guessHandleType } from "../internal_binding/util.ts";import { codeMap } from "../internal_binding/uv.ts";
export type SocketType = "udp4" | "udp6";
export const kStateSymbol: unique symbol = Symbol("kStateSymbol");
function lookup4(  lookup: typeof defaultLookup,  address: string,  callback: (    err: ErrnoException | null,    address: string,    family: number,  ) => void,) {  return lookup(address || "127.0.0.1", 4, callback);}
function lookup6(  lookup: typeof defaultLookup,  address: string,  callback: (    err: ErrnoException | null,    address: string,    family: number,  ) => void,) {  return lookup(address || "::1", 6, callback);}
export function newHandle(  type: SocketType,  lookup?: typeof defaultLookup,): UDP {  if (lookup === undefined) {    lookup = defaultLookup;  } else {    validateFunction(lookup, "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();}
export function _createSocketHandle(  address: string,  port: number,  addressType: SocketType,  fd: number,  flags: number,) {  const handle = newHandle(addressType);  let err;
  if (isInt32(fd) && fd > 0) {    const type = guessHandleType(fd);
    if (type !== "UDP") {      err = codeMap.get("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;}
export default {  kStateSymbol,  newHandle,  _createSocketHandle,};