/*
* Copyright (c) 2015, 2016, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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
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package jdk.incubator.http;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.Supplier;
import jdk.incubator.http.internal.common.AsyncWriteQueue;
import jdk.incubator.http.internal.common.ByteBufferReference;
import jdk.incubator.http.internal.common.Log;
import jdk.incubator.http.internal.common.MinimalFuture;
import jdk.incubator.http.internal.common.Utils;
/**
* Plain raw TCP connection direct to destination. 2 modes
* 1) Blocking used by http/1. In this case the connect is actually non
* blocking but the request is sent blocking. The first byte of a response
* is received non-blocking and the remainder of the response is received
* blocking
* 2) Non-blocking. In this case (for http/2) the connection is actually opened
* blocking but all reads and writes are done non-blocking under the
* control of a Http2Connection object.
*/
class PlainHttpConnection extends HttpConnection implements AsyncConnection {
protected SocketChannel chan;
private volatile boolean connected;
private boolean closed;
// should be volatile to provide proper synchronization(visibility) action
private volatile Consumer<ByteBufferReference> asyncReceiver;
private volatile Consumer<Throwable> errorReceiver;
private volatile Supplier<ByteBufferReference> readBufferSupplier;
private final AsyncWriteQueue asyncOutputQ = new AsyncWriteQueue(this::asyncOutput);
private final Object reading = new Object();
@Override
public void startReading() {
try {
client.registerEvent(new ReadEvent());
} catch (IOException e) {
shutdown();
}
}
class ConnectEvent extends AsyncEvent {
CompletableFuture<Void> cf;
ConnectEvent(CompletableFuture<Void> cf) {
super(AsyncEvent.BLOCKING);
this.cf = cf;
}
@Override
public SelectableChannel channel() {
return chan;
}
@Override
public int interestOps() {
return SelectionKey.OP_CONNECT;
}
@Override
public void handle() {
try {
chan.finishConnect();
} catch (IOException e) {
cf.completeExceptionally(e);
}
connected = true;
cf.complete(null);
}
@Override
public void abort() {
close();
}
}
@Override
public CompletableFuture<Void> connectAsync() {
CompletableFuture<Void> plainFuture = new MinimalFuture<>();
try {
chan.configureBlocking(false);
chan.connect(address);
client.registerEvent(new ConnectEvent(plainFuture));
} catch (IOException e) {
plainFuture.completeExceptionally(e);
}
return plainFuture;
}
@Override
public void connect() throws IOException {
chan.connect(address);
connected = true;
}
@Override
SocketChannel channel() {
return chan;
}
PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) {
super(addr, client);
try {
this.chan = SocketChannel.open();
int bufsize = client.getReceiveBufferSize();
chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize);
chan.setOption(StandardSocketOptions.TCP_NODELAY, true);
} catch (IOException e) {
throw new InternalError(e);
}
}
@Override
long write(ByteBuffer[] buffers, int start, int number) throws IOException {
if (getMode() != Mode.ASYNC) {
return chan.write(buffers, start, number);
}
// async
buffers = Utils.reduce(buffers, start, number);
long n = Utils.remaining(buffers);
asyncOutputQ.put(ByteBufferReference.toReferences(buffers));
flushAsync();
return n;
}
@Override
long write(ByteBuffer buffer) throws IOException {
if (getMode() != Mode.ASYNC) {
return chan.write(buffer);
}
// async
long n = buffer.remaining();
asyncOutputQ.put(ByteBufferReference.toReferences(buffer));
flushAsync();
return n;
}
// handle registered WriteEvent; invoked from SelectorManager thread
void flushRegistered() {
if (getMode() == Mode.ASYNC) {
try {
asyncOutputQ.flushDelayed();
} catch (IOException e) {
// Only IOException caused by closed Queue is expected here
shutdown();
}
}
}
@Override
public void writeAsync(ByteBufferReference[] buffers) throws IOException {
if (getMode() != Mode.ASYNC) {
chan.write(ByteBufferReference.toBuffers(buffers));
ByteBufferReference.clear(buffers);
} else {
asyncOutputQ.put(buffers);
}
}
@Override
public void writeAsyncUnordered(ByteBufferReference[] buffers) throws IOException {
if (getMode() != Mode.ASYNC) {
chan.write(ByteBufferReference.toBuffers(buffers));
ByteBufferReference.clear(buffers);
} else {
// Unordered frames are sent before existing frames.
asyncOutputQ.putFirst(buffers);
}
}
@Override
public void flushAsync() throws IOException {
if (getMode() == Mode.ASYNC) {
asyncOutputQ.flush();
}
}
void asyncOutput(ByteBufferReference[] refs, AsyncWriteQueue delayCallback) {
try {
ByteBuffer[] bufs = ByteBufferReference.toBuffers(refs);
while (Utils.remaining(bufs) > 0) {
long n = chan.write(bufs);
if (n == 0) {
delayCallback.setDelayed(refs);
client.registerEvent(new WriteEvent());
return;
}
}
ByteBufferReference.clear(refs);
} catch (IOException e) {
shutdown();
}
}
@Override
public String toString() {
return "PlainHttpConnection: " + super.toString();
}
/**
* Close this connection
*/
@Override
public synchronized void close() {
if (closed) {
return;
}
closed = true;
try {
Log.logError("Closing: " + toString());
//System.out.println("Closing: " + this);
chan.close();
} catch (IOException e) {}
}
@Override
void shutdownInput() throws IOException {
chan.shutdownInput();
}
@Override
void shutdownOutput() throws IOException {
chan.shutdownOutput();
}
void shutdown() {
close();
errorReceiver.accept(new IOException("Connection aborted"));
}
void asyncRead() {
synchronized (reading) {
try {
while (true) {
ByteBufferReference buf = readBufferSupplier.get();
int n = chan.read(buf.get());
//System.err.printf("Read %d bytes from chan\n", n);
if (n == -1) {
throw new IOException();
}
if (n == 0) {
buf.clear();
return;
}
buf.get().flip();
asyncReceiver.accept(buf);
}
} catch (IOException e) {
shutdown();
}
}
}
@Override
protected ByteBuffer readImpl() throws IOException {
ByteBuffer dst = ByteBuffer.allocate(8192);
int n = readImpl(dst);
if (n > 0) {
return dst;
} else if (n == 0) {
return Utils.EMPTY_BYTEBUFFER;
} else {
return null;
}
}
@Override
protected int readImpl(ByteBuffer buf) throws IOException {
int mark = buf.position();
int n;
// FIXME: this hack works in conjunction with the corresponding change
// in jdk.incubator.http.RawChannel.registerEvent
//if ((n = buffer.remaining()) != 0) {
//buf.put(buffer);
//} else {
n = chan.read(buf);
//}
if (n == -1) {
return -1;
}
Utils.flipToMark(buf, mark);
String s = "Receive (" + n + " bytes) ";
//debugPrint(s, buf);
return n;
}
@Override
ConnectionPool.CacheKey cacheKey() {
return new ConnectionPool.CacheKey(address, null);
}
@Override
synchronized boolean connected() {
return connected;
}
// used for all output in HTTP/2
class WriteEvent extends AsyncEvent {
WriteEvent() {
super(0);
}
@Override
public SelectableChannel channel() {
return chan;
}
@Override
public int interestOps() {
return SelectionKey.OP_WRITE;
}
@Override
public void handle() {
flushRegistered();
}
@Override
public void abort() {
shutdown();
}
}
// used for all input in HTTP/2
class ReadEvent extends AsyncEvent {
ReadEvent() {
super(AsyncEvent.REPEATING); // && !BLOCKING
}
@Override
public SelectableChannel channel() {
return chan;
}
@Override
public int interestOps() {
return SelectionKey.OP_READ;
}
@Override
public void handle() {
asyncRead();
}
@Override
public void abort() {
shutdown();
}
}
// used in blocking channels only
class ReceiveResponseEvent extends AsyncEvent {
CompletableFuture<Void> cf;
ReceiveResponseEvent(CompletableFuture<Void> cf) {
super(AsyncEvent.BLOCKING);
this.cf = cf;
}
@Override
public SelectableChannel channel() {
return chan;
}
@Override
public void handle() {
cf.complete(null);
}
@Override
public int interestOps() {
return SelectionKey.OP_READ;
}
@Override
public void abort() {
close();
}
}
@Override
boolean isSecure() {
return false;
}
@Override
boolean isProxied() {
return false;
}
@Override
public void setAsyncCallbacks(Consumer<ByteBufferReference> asyncReceiver,
Consumer<Throwable> errorReceiver,
Supplier<ByteBufferReference> readBufferSupplier) {
this.asyncReceiver = asyncReceiver;
this.errorReceiver = errorReceiver;
this.readBufferSupplier = readBufferSupplier;
}
@Override
CompletableFuture<Void> whenReceivingResponse() {
CompletableFuture<Void> cf = new MinimalFuture<>();
try {
client.registerEvent(new ReceiveResponseEvent(cf));
} catch (IOException e) {
cf.completeExceptionally(e);
}
return cf;
}
}