umka_client_with_answer.dart

import 'dart:io';

import 'package:grpc/grpc.dart';

import 'generated/umka.pbgrpc.dart';

class UmkaTerminalClient {
  late final ClientChannel channel;
  late final UmkaClient stub;

  UmkaTerminalClient() {
    channel = ClientChannel(
      '127.0.0.1',
      port: 5555,
      options: ChannelOptions(credentials: ChannelCredentials.insecure()),
    );
    stub = UmkaClient(channel);
  }

  Future<Question> getQuestion(Student student) async {
    final question = await stub.getQuestion(student);
    print('Received question: $question');
    return question;
  }

  Future<void> sendAnswer(Student student, Question question) async {
    final answer = Answer()
      ..question = question
      ..student = student;

    print('Enter your answer: ');

    answer.text = stdin.readLineSync()!;

    final evaluation = await stub.sendAnswer(answer);

    print('Evaluation for the answer: ${answer.text} '
        '\non the question ${question.text}:'
        '\n$evaluation');
  }

  Future<void> callService(Student student) async {
    final question = await getQuestion(student);
    await sendAnswer(student, question);
    await channel.shutdown();
  }
}

Future<void> main(List<String> args) async {
  final clientApp = UmkaTerminalClient();
  final student = Student()
    ..id = 42
    ..name = 'Alice Bobich';
  await clientApp.callService(student);
}