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   /*
    * Copyright 2013 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.testsuite.transport.socket;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelHandler;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.socket.oio.OioSocketChannel;
  import io.netty.util.internal.SocketUtils;
  import io.netty.util.NetUtil;
  import io.netty.util.concurrent.GlobalEventExecutor;
  import io.netty.util.concurrent.Promise;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.TestInfo;
  import org.junit.jupiter.api.Timeout;
  
  import java.io.IOException;
  import java.net.ConnectException;
  import java.net.Socket;
  import java.util.concurrent.TimeUnit;
  
  import static io.netty.testsuite.transport.socket.SocketTestPermutation.BAD_HOST;
  import static io.netty.testsuite.transport.socket.SocketTestPermutation.BAD_PORT;
  import static org.hamcrest.CoreMatchers.*;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.fail;
  import static org.junit.jupiter.api.Assumptions.assumeTrue;
  
  public class SocketConnectionAttemptTest extends AbstractClientSocketTest {
  
      // See /etc/services
      private static final int UNASSIGNED_PORT = 4;
  
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testConnectTimeout(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<Bootstrap>() {
              @Override
              public void run(Bootstrap bootstrap) throws Throwable {
                  testConnectTimeout(bootstrap);
              }
          });
      }
  
      public void testConnectTimeout(Bootstrap cb) throws Throwable {
          cb.handler(new TestHandler()).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 2000);
          ChannelFuture future = cb.connect(BAD_HOST, BAD_PORT);
          try {
              assertThat(future.await(3000), is(true));
          } finally {
              future.channel().close();
          }
      }
  
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testConnectRefused(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<Bootstrap>() {
              @Override
              public void run(Bootstrap bootstrap) throws Throwable {
                  testConnectRefused(bootstrap);
              }
          });
      }
  
      public void testConnectRefused(Bootstrap cb) throws Throwable {
          testConnectRefused0(cb, false);
      }
  
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testConnectRefusedHalfClosure(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<Bootstrap>() {
              @Override
              public void run(Bootstrap bootstrap) throws Throwable {
                  testConnectRefusedHalfClosure(bootstrap);
              }
          });
      }
  
     public void testConnectRefusedHalfClosure(Bootstrap cb) throws Throwable {
         testConnectRefused0(cb, true);
     }
 
     private static void testConnectRefused0(Bootstrap cb, boolean halfClosure) throws Throwable {
         final Promise<Error> errorPromise = GlobalEventExecutor.INSTANCE.newPromise();
         ChannelHandler handler = new ChannelInboundHandlerAdapter() {
             @Override
             public void channelActive(ChannelHandlerContext ctx) throws Exception {
                 errorPromise.setFailure(new AssertionError("should have never been called"));
             }
         };
 
         cb.handler(handler);
         cb.option(ChannelOption.ALLOW_HALF_CLOSURE, halfClosure);
         ChannelFuture future = cb.connect(NetUtil.LOCALHOST, UNASSIGNED_PORT).awaitUninterruptibly();
         assertThat(future.cause(), is(instanceOf(ConnectException.class)));
         assertThat(errorPromise.cause(), is(nullValue()));
     }
 
     @Test
     public void testConnectCancellation(TestInfo testInfo) throws Throwable {
         // Check if the test can be executed or should be skipped because of no network/internet connection
         // See https://github.com/netty/netty/issues/1474
         boolean badHostTimedOut = true;
         Socket socket = new Socket();
         try {
             SocketUtils.connect(socket, SocketUtils.socketAddress(BAD_HOST, BAD_PORT), 10);
         } catch (ConnectException e) {
             badHostTimedOut = false;
             // is thrown for no route to host when using Socket connect
         } catch (Exception e) {
             // ignore
         } finally {
             try {
                 socket.close();
             } catch (IOException e) {
                 // ignore
             }
         }
 
         assumeTrue(badHostTimedOut, "The connection attempt to " + BAD_HOST + " does not time out.");
 
         run(testInfo, new Runner<Bootstrap>() {
             @Override
             public void run(Bootstrap bootstrap) throws Throwable {
                 testConnectCancellation(bootstrap);
             }
         });
     }
 
     public void testConnectCancellation(Bootstrap cb) throws Throwable {
         cb.handler(new TestHandler()).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 4000);
         ChannelFuture future = cb.connect(BAD_HOST, BAD_PORT);
         try {
             if (future.await(1000)) {
                 if (future.isSuccess()) {
                     fail("A connection attempt to " + BAD_HOST + " must not succeed.");
                 } else {
                     throw future.cause();
                 }
             }
 
             if (future.cancel(true)) {
                 assertThat(future.channel().closeFuture().await(500), is(true));
                 assertThat(future.isCancelled(), is(true));
             } else {
                 // Check if cancellation is supported or not.
                 assertFalse(isConnectCancellationSupported(future.channel()), future.channel().getClass() +
                         " should support connect cancellation");
             }
         } finally {
             future.channel().close();
         }
     }
 
     @SuppressWarnings("deprecation")
     protected boolean isConnectCancellationSupported(Channel channel) {
         return !(channel instanceof OioSocketChannel);
     }
 
     private static class TestHandler extends ChannelInboundHandlerAdapter {
         @Override
         public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
             InternalLoggerFactory.getInstance(
                     SocketConnectionAttemptTest.class).warn("Unexpected exception:", cause);
         }
     }
 }