whois_handler.dart
import 'dart:io';
import 'package:async/async.dart';
import 'dart:convert';
class Whois{
Whois({this.domain});
Socket socket;
String domain;
bool dataFinished = false;
bool doneFinished = false;
bool errorFinished = false;
bool saveFinished = false;
bool getData = false;
int tryTimes = 0;
int tryDone = 0;
int errorTime = 0;
String rawWhois = '';
Future request()async{
dataFinished = false;
doneFinished = false;
errorFinished = false;
saveFinished = false;
getData = false;
try {
socket = await Socket.connect('whois.cnnic.net.cn', 43);
socket.listen(onData, onError: onError);
socket.write(domain + '
');
}catch(e){
print('0, create socket error: ${e.toString()}');
}
try{
await socket.done;
print('4. $domain done');
}catch(error){
print('1, transit error: ${error.toString()}');
await Future.delayed(Duration(seconds: 2));
await request();
}
}
void onData(value)async {
getData = true;
rawWhois = utf8.decode(value);
print('3. whois: $rawWhois}');
saveFinished = true;
print('mmmmmmmmmmmmmmmmmmmmmmm $domain done mmmmmmmmmmmmmmmmmmmmmmmm');
}
void onError(e)async{
socket.destroy();
print('error: ${e.toString()}');
if(errorTime<2){
await Future.delayed(Duration(seconds: 2));
request();
errorTime++;
}else{
print('5. try too many times but failed, force to next');
saveFinished = true;
}
}
}
main.dart
import 'package:flutter/material.dart';
import 'package:spatialhash/spatialhash.dart';
import 'utils/whois_handler.dart';
import 'dart:async';
main()=>runApp(MaterialApp(
home: MyApp(),
));
class MyApp extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return MyAppState();
}
}
class MyAppState extends State<MyApp> {
List a = 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checkWhois()async{
for(int i=0; i<a.length; i++){
var x = Whois(domain: a[i]);
x.request();
while(!x.saveFinished){
await Future.delayed(Duration(milliseconds: 100));
}
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('ab'),),
body: Container(
double.infinity, height: double.infinity,
child: Column(
children: <Widget>[
RaisedButton(child: Text('check'),onPressed: (){
checkWhois();
},),
RaisedButton(child: Text('stop'),onPressed: (){},),
],
),
),
);
}
}