whois

import 'dart:io';

import 'dart:convert';

main()async{

  List a = 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  for(int i=0; i<a.length; i++){

    Whois w = Whois(domain: a[i]);

    await w.getWhois();

  }

}

class Whois{

  Whois({this.domain});

  Socket socket;

  String domain;

  bool dataFinished = false;

  bool doneFinished = false;

  bool getData = false;

  String s = 'start:';

  Future getWhois()async{

    await request();

    while(!dataFinished){

      await Future.delayed(Duration(milliseconds: 100));

    }

  }

  Future request()async{

    dataFinished = false;

    doneFinished = false;

    getData = false;

    try {

      socket = await Socket.connect('whois.cnnic.net.cn', 43);

      socket.listen(onData, onError: onError, onDone: onDone);

      print('============================================================================================================');

      print('$s $domain');

      socket.write(domain + '\n');

    }catch(e){

      print('from request error: ${e.toString()}');

      print('waiting 2 seconds');

      sleep(Duration(seconds: 2));

    }

  }

  void onError(e){

    print('===================== error ==============================');

    print('from error side: ${e.toString()}');

    errorFinished = true;

  }

  void onData(value)async{

    getData = true;

    String data = utf8.decode(value);

    print('===================== WHOIS ==============================');

    if(data.contains('interval')){

      print('system notice too fast, wait 2 seconds');

      socket.destroy();

      sleep(Duration(seconds: 2));

      s = 'restart';

      await request();

    }else{

      print('not find interval');

      dataFinished = true;

      print('whois:::::::: ${data.substring(0, 18)}');

    }

  }

  onDone()async{

    int t = 1;

    print('mmmmmmmmmmmmmmmmmmmmm DONE mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm');

    sleep(Duration(milliseconds: 100));

    while(t<5){

      if(getData == false){

        print('wairint data from onDone function: $t');

        sleep(Duration(milliseconds: 50));

        t++;

      }else{

        t = 5;

      }

    }

    if(getData == false){

      socket.destroy();

      print('wait too long time without response, wait 2 second to restart.');

      sleep(Duration(seconds: 2));

      s = 'restart';

      await request();

    }

  }

}