jdk/test/java/net/httpclient/whitebox/jdk.incubator.httpclient/jdk/incubator/http/RawChannelTest.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package jdk.incubator.http;

 import jdk.incubator.http.internal.websocket.RawChannel;
 import org.testng.annotations.Test;

 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.UncheckedIOException;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.URI;
 import java.nio.ByteBuffer;
 import java.nio.channels.SelectionKey;
 import java.util.Random;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;

 import static jdk.incubator.http.HttpResponse.BodyHandler.discard;
 import static org.testng.Assert.assertEquals;

 /*
  * This test exercises mechanics of _independent_ reads and writes on the
  * RawChannel. It verifies that the underlying implementation can manage more
  * than a single type of notifications at the same time.
  */
 public class RawChannelTest {

     private final AtomicLong clientWritten = new AtomicLong();
     private final AtomicLong serverWritten = new AtomicLong();
     private final AtomicLong clientRead = new AtomicLong();
     private final AtomicLong serverRead = new AtomicLong();

     /*
      * Since at this level we don't have any control over the low level socket
      * parameters, this latch ensures a write to the channel will stall at least
      * once (socket's send buffer filled up).
      */
     private final CountDownLatch writeStall = new CountDownLatch(1);
     private final CountDownLatch initialWriteStall = new CountDownLatch(1);

     /*
      * This one works similarly by providing means to ensure a read from the
      * channel will stall at least once (no more data available on the socket).
      */
     private final CountDownLatch readStall = new CountDownLatch(1);
     private final CountDownLatch initialReadStall = new CountDownLatch(1);

     private final AtomicInteger writeHandles = new AtomicInteger();
     private final AtomicInteger readHandles = new AtomicInteger();

     private final CountDownLatch exit = new CountDownLatch(1);

     @Test
     public void test() throws Exception {
         try (ServerSocket server = new ServerSocket(0)) {
             int port = server.getLocalPort();
             new TestServer(server).start();

             final RawChannel chan = channelOf(port);
             initialWriteStall.await();

             // It's very important not to forget the initial bytes, possibly
             // left from the HTTP thingy
             int initialBytes = chan.initialByteBuffer().remaining();
             print("RawChannel has %s initial bytes", initialBytes);
             clientRead.addAndGet(initialBytes);

             // tell the server we have read the initial bytes, so
             // that it makes sure there is something for us to
             // read next in case the initialBytes have already drained the
             // channel dry.
             initialReadStall.countDown();

             chan.registerEvent(new RawChannel.RawEvent() {

                 private final ByteBuffer reusableBuffer = ByteBuffer.allocate(32768);

                 @Override
                 public int interestOps() {
                     return SelectionKey.OP_WRITE;
                 }

                 @Override
                 public void handle() {
                     int i = writeHandles.incrementAndGet();
                     print("OP_WRITE #%s", i);
                     if (i > 3) { // Fill up the send buffer not more than 3 times
                         try {
                             chan.shutdownOutput();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                         return;
                     }
                     long total = 0;
                     try {
                         long n;
                         do {
                             ByteBuffer[] array = {reusableBuffer.slice()};
                             n = chan.write(array, 0, 1);
                             total += n;
                         } while (n > 0);
                         print("OP_WRITE clogged SNDBUF with %s bytes", total);
                         clientWritten.addAndGet(total);
                         chan.registerEvent(this);
                         writeStall.countDown(); // signal send buffer is full
                     } catch (IOException e) {
                         throw new UncheckedIOException(e);
                     }
                 }
             });

             chan.registerEvent(new RawChannel.RawEvent() {

                 @Override
                 public int interestOps() {
                     return SelectionKey.OP_READ;
                 }

                 @Override
                 public void handle() {
                     int i = readHandles.incrementAndGet();
                     print("OP_READ #%s", i);
                     ByteBuffer read = null;
                     long total = 0;
                     while (true) {
                         try {
                             read = chan.read();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                         if (read == null) {
                             print("OP_READ EOF");
                             break;
                         } else if (!read.hasRemaining()) {
                             print("OP_READ stall");
                             try {
                                 chan.registerEvent(this);
                             } catch (IOException e) {
                                 e.printStackTrace();
                             }
                             readStall.countDown();
                             break;
                         }
                         int r = read.remaining();
                         total += r;
                         clientRead.addAndGet(r);
                     }
                     print("OP_READ read %s bytes (%s total)", total, clientRead.get());
                 }
             });
             exit.await(); // All done, we need to compare results:
             assertEquals(clientRead.get(), serverWritten.get());
             assertEquals(serverRead.get(), clientWritten.get());
         }
     }

     private static RawChannel channelOf(int port) throws Exception {
         URI uri = URI.create("http://127.0.0.1:" + port + "/");
         print("raw channel to %s", uri.toString());
         HttpRequest req = HttpRequest.newBuilder(uri).build();
         HttpResponse<?> r = HttpClient.newHttpClient().send(req, discard(null));
         r.body();
         return ((HttpResponseImpl) r).rawChannel();
     }

     private class TestServer extends Thread { // Powered by Slowpokes

         private final ServerSocket server;

         TestServer(ServerSocket server) throws IOException {
             this.server = server;
         }

         @Override
         public void run() {
             try (Socket s = server.accept()) {
                 InputStream is = s.getInputStream();
                 OutputStream os = s.getOutputStream();

                 processHttp(is, os);

                 Thread reader = new Thread(() -> {
                     try {
                         long n = readSlowly(is);
                         print("Server read %s bytes", n);
                         serverRead.addAndGet(n);
                         s.shutdownInput();
                     } catch (Exception e) {
                         e.printStackTrace();
                     }
                 });

                 Thread writer = new Thread(() -> {
                     try {
                         long n = writeSlowly(os);
                         print("Server written %s bytes", n);
                         serverWritten.addAndGet(n);
                         s.shutdownOutput();
                     } catch (Exception e) {
                         e.printStackTrace();
                     }
                 });

                 reader.start();
                 writer.start();

                 reader.join();
                 writer.join();
             } catch (Exception e) {
                 e.printStackTrace();
             } finally {
                 exit.countDown();
             }
         }

         private void processHttp(InputStream is, OutputStream os)
                 throws IOException
         {
             os.write("HTTP/1.1 200 OK\r\nContent-length: 0\r\n\r\n".getBytes());

             // write some initial bytes
             byte[] initial = byteArrayOfSize(1024);
             os.write(initial);
             os.flush();
             serverWritten.addAndGet(initial.length);
             initialWriteStall.countDown();

             byte[] buf = new byte[1024];
             String s = "";
             while (true) {
                 int n = is.read(buf);
                 if (n <= 0) {
                     throw new RuntimeException("Unexpected end of request");
                 }
                 s = s + new String(buf, 0, n);
                 if (s.contains("\r\n\r\n")) {
                     break;
                 }
             }
         }

         private long writeSlowly(OutputStream os) throws Exception {
             byte[] first = byteArrayOfSize(1024);
             long total = first.length;
             os.write(first);
             os.flush();

             // wait until initial bytes were read
             initialReadStall.await();

             // make sure there is something to read, otherwise readStall
             // will never be counted down.
             first = byteArrayOfSize(1024);
             os.write(first);
             os.flush();
             total += first.length;

             // Let's wait for the signal from the raw channel that its read has
             // stalled, and then continue sending a bit more stuff
             readStall.await();
             for (int i = 0; i < 32; i++) {
                 byte[] b = byteArrayOfSize(1024);
                 os.write(b);
                 os.flush();
                 total += b.length;
                 TimeUnit.MILLISECONDS.sleep(1);
             }
             return total;
         }

         private long readSlowly(InputStream is) throws Exception {
             // Wait for the raw channel to fill up its send buffer
             writeStall.await();
             long overall = 0;
             byte[] array = new byte[1024];
             for (int n = 0; n != -1; n = is.read(array)) {
                 TimeUnit.MILLISECONDS.sleep(1);
                 overall += n;
             }
             return overall;
         }
     }

     private static void print(String format, Object... args) {
         System.out.println(Thread.currentThread() + ": " + String.format(format, args));
     }

     private static byte[] byteArrayOfSize(int bound) {
         return new byte[new Random().nextInt(1 + bound)];
     }
 }
	/*
	* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.incubator.http;

	import jdk.incubator.http.internal.websocket.RawChannel;
	import org.testng.annotations.Test;

	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.io.UncheckedIOException;
	import java.net.ServerSocket;
	import java.net.Socket;
	import java.net.URI;
	import java.nio.ByteBuffer;
	import java.nio.channels.SelectionKey;
	import java.util.Random;
	import java.util.concurrent.CountDownLatch;
	import java.util.concurrent.TimeUnit;
	import java.util.concurrent.atomic.AtomicInteger;
	import java.util.concurrent.atomic.AtomicLong;

	import static jdk.incubator.http.HttpResponse.BodyHandler.discard;
	import static org.testng.Assert.assertEquals;

	/*
	* This test exercises mechanics of _independent_ reads and writes on the
	* RawChannel. It verifies that the underlying implementation can manage more
	* than a single type of notifications at the same time.
	*/
	public class RawChannelTest {

	private final AtomicLong clientWritten = new AtomicLong();
	private final AtomicLong serverWritten = new AtomicLong();
	private final AtomicLong clientRead = new AtomicLong();
	private final AtomicLong serverRead = new AtomicLong();

	/*
	* Since at this level we don't have any control over the low level socket
	* parameters, this latch ensures a write to the channel will stall at least
	* once (socket's send buffer filled up).
	*/
	private final CountDownLatch writeStall = new CountDownLatch(1);
	private final CountDownLatch initialWriteStall = new CountDownLatch(1);

	/*
	* This one works similarly by providing means to ensure a read from the
	* channel will stall at least once (no more data available on the socket).
	*/
	private final CountDownLatch readStall = new CountDownLatch(1);
	private final CountDownLatch initialReadStall = new CountDownLatch(1);

	private final AtomicInteger writeHandles = new AtomicInteger();
	private final AtomicInteger readHandles = new AtomicInteger();

	private final CountDownLatch exit = new CountDownLatch(1);

	@Test
	public void test() throws Exception {
	try (ServerSocket server = new ServerSocket(0)) {
	int port = server.getLocalPort();
	new TestServer(server).start();

	final RawChannel chan = channelOf(port);
	initialWriteStall.await();

	// It's very important not to forget the initial bytes, possibly
	// left from the HTTP thingy
	int initialBytes = chan.initialByteBuffer().remaining();
	print("RawChannel has %s initial bytes", initialBytes);
	clientRead.addAndGet(initialBytes);

	// tell the server we have read the initial bytes, so
	// that it makes sure there is something for us to
	// read next in case the initialBytes have already drained the
	// channel dry.
	initialReadStall.countDown();

	chan.registerEvent(new RawChannel.RawEvent() {

	private final ByteBuffer reusableBuffer = ByteBuffer.allocate(32768);

	@Override
	public int interestOps() {
	return SelectionKey.OP_WRITE;
	}

	@Override
	public void handle() {
	int i = writeHandles.incrementAndGet();
	print("OP_WRITE #%s", i);
	if (i > 3) { // Fill up the send buffer not more than 3 times
	try {
	chan.shutdownOutput();
	} catch (IOException e) {
	e.printStackTrace();
	}
	return;
	}
	long total = 0;
	try {
	long n;
	do {
	ByteBuffer[] array = {reusableBuffer.slice()};
	n = chan.write(array, 0, 1);
	total += n;
	} while (n > 0);
	print("OP_WRITE clogged SNDBUF with %s bytes", total);
	clientWritten.addAndGet(total);
	chan.registerEvent(this);
	writeStall.countDown(); // signal send buffer is full
	} catch (IOException e) {
	throw new UncheckedIOException(e);
	}
	}
	});

	chan.registerEvent(new RawChannel.RawEvent() {

	@Override
	public int interestOps() {
	return SelectionKey.OP_READ;
	}

	@Override
	public void handle() {
	int i = readHandles.incrementAndGet();
	print("OP_READ #%s", i);
	ByteBuffer read = null;
	long total = 0;
	while (true) {
	try {
	read = chan.read();
	} catch (IOException e) {
	e.printStackTrace();
	}
	if (read == null) {
	print("OP_READ EOF");
	break;
	} else if (!read.hasRemaining()) {
	print("OP_READ stall");
	try {
	chan.registerEvent(this);
	} catch (IOException e) {
	e.printStackTrace();
	}
	readStall.countDown();
	break;
	}
	int r = read.remaining();
	total += r;
	clientRead.addAndGet(r);
	}
	print("OP_READ read %s bytes (%s total)", total, clientRead.get());
	}
	});
	exit.await(); // All done, we need to compare results:
	assertEquals(clientRead.get(), serverWritten.get());
	assertEquals(serverRead.get(), clientWritten.get());
	}
	}

	private static RawChannel channelOf(int port) throws Exception {
	URI uri = URI.create("http://127.0.0.1:" + port + "/");
	print("raw channel to %s", uri.toString());
	HttpRequest req = HttpRequest.newBuilder(uri).build();
	HttpResponse<?> r = HttpClient.newHttpClient().send(req, discard(null));
	r.body();
	return ((HttpResponseImpl) r).rawChannel();
	}

	private class TestServer extends Thread { // Powered by Slowpokes

	private final ServerSocket server;

	TestServer(ServerSocket server) throws IOException {
	this.server = server;
	}

	@Override
	public void run() {
	try (Socket s = server.accept()) {
	InputStream is = s.getInputStream();
	OutputStream os = s.getOutputStream();

	processHttp(is, os);

	Thread reader = new Thread(() -> {
	try {
	long n = readSlowly(is);
	print("Server read %s bytes", n);
	serverRead.addAndGet(n);
	s.shutdownInput();
	} catch (Exception e) {
	e.printStackTrace();
	}
	});

	Thread writer = new Thread(() -> {
	try {
	long n = writeSlowly(os);
	print("Server written %s bytes", n);
	serverWritten.addAndGet(n);
	s.shutdownOutput();
	} catch (Exception e) {
	e.printStackTrace();
	}
	});

	reader.start();
	writer.start();

	reader.join();
	writer.join();
	} catch (Exception e) {
	e.printStackTrace();
	} finally {
	exit.countDown();
	}
	}

	private void processHttp(InputStream is, OutputStream os)
	throws IOException
	{
	os.write("HTTP/1.1 200 OK\r\nContent-length: 0\r\n\r\n".getBytes());

	// write some initial bytes
	byte[] initial = byteArrayOfSize(1024);
	os.write(initial);
	os.flush();
	serverWritten.addAndGet(initial.length);
	initialWriteStall.countDown();

	byte[] buf = new byte[1024];
	String s = "";
	while (true) {
	int n = is.read(buf);
	if (n <= 0) {
	throw new RuntimeException("Unexpected end of request");
	}
	s = s + new String(buf, 0, n);
	if (s.contains("\r\n\r\n")) {
	break;
	}
	}
	}

	private long writeSlowly(OutputStream os) throws Exception {
	byte[] first = byteArrayOfSize(1024);
	long total = first.length;
	os.write(first);
	os.flush();

	// wait until initial bytes were read
	initialReadStall.await();

	// make sure there is something to read, otherwise readStall
	// will never be counted down.
	first = byteArrayOfSize(1024);
	os.write(first);
	os.flush();
	total += first.length;

	// Let's wait for the signal from the raw channel that its read has
	// stalled, and then continue sending a bit more stuff
	readStall.await();
	for (int i = 0; i < 32; i++) {
	byte[] b = byteArrayOfSize(1024);
	os.write(b);
	os.flush();
	total += b.length;
	TimeUnit.MILLISECONDS.sleep(1);
	}
	return total;
	}

	private long readSlowly(InputStream is) throws Exception {
	// Wait for the raw channel to fill up its send buffer
	writeStall.await();
	long overall = 0;
	byte[] array = new byte[1024];
	for (int n = 0; n != -1; n = is.read(array)) {
	TimeUnit.MILLISECONDS.sleep(1);
	overall += n;
	}
	return overall;
	}
	}

	private static void print(String format, Object... args) {
	System.out.println(Thread.currentThread() + ": " + String.format(format, args));
	}

	private static byte[] byteArrayOfSize(int bound) {
	return new byte[new Random().nextInt(1 + bound)];
	}
	}