trackoffical_app/lib/model/m_net_image.dart

import 'dart:io';
import 'dart:typed_data';
import 'package:f_cache/manager.dart';
import 'package:http/http.dart' as http;
import '../utils.dart';
import '../pb.dart' as pb;


class MNetImage{
  String url = '';
  Uint8List md5 = Uint8List(0);
  Uint8List? data;
  int? timestamp;
  var ext = '';
  Uint8List nonce = Uint8List(0);

  String? get md5Hex {
    if(md5.isEmpty){
      return null;
    }else{
      return md5.toHexString();
    }
  }

  Future<Reader> readerBuilder()async{
    final url = Uri.parse(this.url);
    var request = http.Request('GET', url);
    var response = await request.send();
    if (response.statusCode != 200) {
      throw HttpException('state: ${response.statusCode}', uri: url);
    }
    final length = response.contentLength ?? 0;
    return Reader(response.stream, length);
  }
  Future<void> preload()async{
    await CacheManager().getCached(id: md5Hex ?? '', readerBuilder: readerBuilder);
  }

}

extension PbNetImageExtension on pb.NetImage{
  MNetImage toModel(){
    return MNetImage()
      ..url = url
      ..md5 = Uint8List.fromList(md5);
  }
}