whois

import 'dart:io';
import 'dart:convert';

main()async{
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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();
    }

  }
}