597 lines
25 KiB
Java
597 lines
25 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel.kqueue;
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import io.netty.buffer.ByteBufConvertible;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufAllocator;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelConfig;
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import io.netty.channel.ChannelMetadata;
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import io.netty.channel.ChannelOutboundBuffer;
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import io.netty.channel.ChannelPipeline;
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import io.netty.channel.DefaultFileRegion;
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import io.netty.channel.EventLoop;
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import io.netty.channel.FileRegion;
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import io.netty.channel.internal.ChannelUtils;
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import io.netty.channel.socket.DuplexChannel;
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import io.netty.channel.unix.IovArray;
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import io.netty.channel.unix.SocketWritableByteChannel;
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import io.netty.channel.unix.UnixChannelUtil;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.UnstableApi;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.io.IOException;
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import java.net.SocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.WritableByteChannel;
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import java.util.concurrent.Executor;
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import static io.netty.channel.internal.ChannelUtils.MAX_BYTES_PER_GATHERING_WRITE_ATTEMPTED_LOW_THRESHOLD;
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import static io.netty.channel.internal.ChannelUtils.WRITE_STATUS_SNDBUF_FULL;
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@UnstableApi
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public abstract class AbstractKQueueStreamChannel extends AbstractKQueueChannel implements DuplexChannel {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(AbstractKQueueStreamChannel.class);
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private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
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private static final String EXPECTED_TYPES =
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" (expected: " + StringUtil.simpleClassName(ByteBuf.class) + ", " +
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StringUtil.simpleClassName(DefaultFileRegion.class) + ')';
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private WritableByteChannel byteChannel;
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private final Runnable flushTask = () -> {
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// Calling flush0 directly to ensure we not try to flush messages that were added via write(...) in the
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// meantime.
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((AbstractKQueueUnsafe) unsafe()).flush0();
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};
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AbstractKQueueStreamChannel(Channel parent, EventLoop eventLoop, BsdSocket fd, boolean active) {
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super(parent, eventLoop, fd, active);
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}
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AbstractKQueueStreamChannel(Channel parent, EventLoop eventLoop, BsdSocket fd, SocketAddress remote) {
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super(parent, eventLoop, fd, remote);
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}
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AbstractKQueueStreamChannel(EventLoop eventLoop, BsdSocket fd) {
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this(null, eventLoop, fd, isSoErrorZero(fd));
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}
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@Override
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protected AbstractKQueueUnsafe newUnsafe() {
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return new KQueueStreamUnsafe();
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}
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@Override
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public abstract KQueueDuplexChannelConfig config();
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@Override
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public ChannelMetadata metadata() {
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return METADATA;
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}
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/**
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* Write bytes form the given {@link ByteBuf} to the underlying {@link java.nio.channels.Channel}.
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* @param in the collection which contains objects to write.
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* @param buf the {@link ByteBuf} from which the bytes should be written
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but no
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* data was accepted</li>
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* </ul>
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*/
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private int writeBytes(ChannelOutboundBuffer in, ByteBuf buf) throws Exception {
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int readableBytes = buf.readableBytes();
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if (readableBytes == 0) {
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in.remove();
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return 0;
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}
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if (buf.hasMemoryAddress() || buf.nioBufferCount() == 1) {
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return doWriteBytes(in, buf);
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} else {
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ByteBuffer[] nioBuffers = buf.nioBuffers();
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return writeBytesMultiple(in, nioBuffers, nioBuffers.length, readableBytes,
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config().getMaxBytesPerGatheringWrite());
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}
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}
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private void adjustMaxBytesPerGatheringWrite(long attempted, long written, long oldMaxBytesPerGatheringWrite) {
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// By default we track the SO_SNDBUF when ever it is explicitly set. However some OSes may dynamically change
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// SO_SNDBUF (and other characteristics that determine how much data can be written at once) so we should try
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// make a best effort to adjust as OS behavior changes.
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if (attempted == written) {
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if (attempted << 1 > oldMaxBytesPerGatheringWrite) {
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config().setMaxBytesPerGatheringWrite(attempted << 1);
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}
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} else if (attempted > MAX_BYTES_PER_GATHERING_WRITE_ATTEMPTED_LOW_THRESHOLD && written < attempted >>> 1) {
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config().setMaxBytesPerGatheringWrite(attempted >>> 1);
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}
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}
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/**
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* Write multiple bytes via {@link IovArray}.
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* @param in the collection which contains objects to write.
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* @param array The array which contains the content to write.
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but
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* no data was accepted</li>
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* </ul>
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* @throws IOException If an I/O exception occurs during write.
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*/
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private int writeBytesMultiple(ChannelOutboundBuffer in, IovArray array) throws IOException {
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final long expectedWrittenBytes = array.size();
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assert expectedWrittenBytes != 0;
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final int cnt = array.count();
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assert cnt != 0;
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final long localWrittenBytes = socket.writevAddresses(array.memoryAddress(0), cnt);
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if (localWrittenBytes > 0) {
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adjustMaxBytesPerGatheringWrite(expectedWrittenBytes, localWrittenBytes, array.maxBytes());
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in.removeBytes(localWrittenBytes);
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return 1;
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}
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return WRITE_STATUS_SNDBUF_FULL;
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}
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/**
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* Write multiple bytes via {@link ByteBuffer} array.
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* @param in the collection which contains objects to write.
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* @param nioBuffers The buffers to write.
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* @param nioBufferCnt The number of buffers to write.
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* @param expectedWrittenBytes The number of bytes we expect to write.
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* @param maxBytesPerGatheringWrite The maximum number of bytes we should attempt to write.
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but
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* no data was accepted</li>
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* </ul>
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* @throws IOException If an I/O exception occurs during write.
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*/
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private int writeBytesMultiple(
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ChannelOutboundBuffer in, ByteBuffer[] nioBuffers, int nioBufferCnt, long expectedWrittenBytes,
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long maxBytesPerGatheringWrite) throws IOException {
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assert expectedWrittenBytes != 0;
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if (expectedWrittenBytes > maxBytesPerGatheringWrite) {
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expectedWrittenBytes = maxBytesPerGatheringWrite;
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}
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final long localWrittenBytes = socket.writev(nioBuffers, 0, nioBufferCnt, expectedWrittenBytes);
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if (localWrittenBytes > 0) {
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adjustMaxBytesPerGatheringWrite(expectedWrittenBytes, localWrittenBytes, maxBytesPerGatheringWrite);
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in.removeBytes(localWrittenBytes);
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return 1;
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}
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return WRITE_STATUS_SNDBUF_FULL;
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}
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/**
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* Write a {@link DefaultFileRegion}
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* @param in the collection which contains objects to write.
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* @param region the {@link DefaultFileRegion} from which the bytes should be written
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but
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* no data was accepted</li>
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* </ul>
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*/
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private int writeDefaultFileRegion(ChannelOutboundBuffer in, DefaultFileRegion region) throws Exception {
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final long regionCount = region.count();
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final long offset = region.transferred();
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if (offset >= regionCount) {
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in.remove();
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return 0;
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}
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final long flushedAmount = socket.sendFile(region, region.position(), offset, regionCount - offset);
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if (flushedAmount > 0) {
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in.progress(flushedAmount);
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if (region.transferred() >= regionCount) {
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in.remove();
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}
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return 1;
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}
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if (flushedAmount == 0) {
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validateFileRegion(region, offset);
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}
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return WRITE_STATUS_SNDBUF_FULL;
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}
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/**
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* Write a {@link FileRegion}
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* @param in the collection which contains objects to write.
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* @param region the {@link FileRegion} from which the bytes should be written
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but no
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* data was accepted</li>
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* </ul>
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*/
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private int writeFileRegion(ChannelOutboundBuffer in, FileRegion region) throws Exception {
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if (region.transferred() >= region.count()) {
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in.remove();
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return 0;
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}
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if (byteChannel == null) {
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byteChannel = new KQueueSocketWritableByteChannel();
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}
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final long flushedAmount = region.transferTo(byteChannel, region.transferred());
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if (flushedAmount > 0) {
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in.progress(flushedAmount);
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if (region.transferred() >= region.count()) {
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in.remove();
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}
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return 1;
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}
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return WRITE_STATUS_SNDBUF_FULL;
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}
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@Override
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protected void doWrite(ChannelOutboundBuffer in) throws Exception {
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int writeSpinCount = config().getWriteSpinCount();
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do {
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final int msgCount = in.size();
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// Do gathering write if the outbound buffer entries start with more than one ByteBuf.
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if (msgCount > 1 && in.current() instanceof ByteBufConvertible) {
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writeSpinCount -= doWriteMultiple(in);
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} else if (msgCount == 0) {
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// Wrote all messages.
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writeFilter(false);
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// Return here so we don't set the WRITE flag.
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return;
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} else { // msgCount == 1
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writeSpinCount -= doWriteSingle(in);
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}
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// We do not break the loop here even if the outbound buffer was flushed completely,
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// because a user might have triggered another write and flush when we notify his or her
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// listeners.
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} while (writeSpinCount > 0);
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if (writeSpinCount == 0) {
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// It is possible that we have set the write filter, woken up by KQUEUE because the socket is writable, and
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// then use our write quantum. In this case we no longer want to set the write filter because the socket is
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// still writable (as far as we know). We will find out next time we attempt to write if the socket is
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// writable and set the write filter if necessary.
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writeFilter(false);
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// We used our writeSpin quantum, and should try to write again later.
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executor().execute(flushTask);
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} else {
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// Underlying descriptor can not accept all data currently, so set the WRITE flag to be woken up
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// when it can accept more data.
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writeFilter(true);
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}
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}
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/**
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* Attempt to write a single object.
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* @param in the collection which contains objects to write.
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but no
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* data was accepted</li>
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* </ul>
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* @throws Exception If an I/O error occurs.
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*/
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protected int doWriteSingle(ChannelOutboundBuffer in) throws Exception {
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// The outbound buffer contains only one message or it contains a file region.
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Object msg = in.current();
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if (msg instanceof ByteBufConvertible) {
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return writeBytes(in, ((ByteBufConvertible) msg).asByteBuf());
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} else if (msg instanceof DefaultFileRegion) {
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return writeDefaultFileRegion(in, (DefaultFileRegion) msg);
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} else if (msg instanceof FileRegion) {
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return writeFileRegion(in, (FileRegion) msg);
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} else {
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// Should never reach here.
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throw new Error();
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}
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}
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/**
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* Attempt to write multiple {@link ByteBuf} objects.
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* @param in the collection which contains objects to write.
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* @return The value that should be decremented from the write quantum which starts at
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* {@link ChannelConfig#getWriteSpinCount()}. The typical use cases are as follows:
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* <ul>
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* <li>0 - if no write was attempted. This is appropriate if an empty {@link ByteBuf} (or other empty content)
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* is encountered</li>
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* <li>1 - if a single call to write data was made to the OS</li>
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* <li>{@link ChannelUtils#WRITE_STATUS_SNDBUF_FULL} - if an attempt to write data was made to the OS, but no
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* data was accepted</li>
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* </ul>
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* @throws Exception If an I/O error occurs.
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*/
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private int doWriteMultiple(ChannelOutboundBuffer in) throws Exception {
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final long maxBytesPerGatheringWrite = config().getMaxBytesPerGatheringWrite();
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IovArray array = registration().cleanArray();
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array.maxBytes(maxBytesPerGatheringWrite);
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in.forEachFlushedMessage(array);
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if (array.count() >= 1) {
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// TODO: Handle the case where cnt == 1 specially.
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return writeBytesMultiple(in, array);
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}
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// cnt == 0, which means the outbound buffer contained empty buffers only.
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in.removeBytes(0);
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return 0;
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}
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@Override
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protected Object filterOutboundMessage(Object msg) {
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if (msg instanceof ByteBufConvertible) {
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ByteBuf buf = ((ByteBufConvertible) msg).asByteBuf();
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return UnixChannelUtil.isBufferCopyNeededForWrite(buf)? newDirectBuffer(buf) : buf;
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}
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if (msg instanceof FileRegion) {
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return msg;
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}
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throw new UnsupportedOperationException(
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"unsupported message type: " + StringUtil.simpleClassName(msg) + EXPECTED_TYPES);
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}
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@UnstableApi
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@Override
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protected final void doShutdownOutput() throws Exception {
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socket.shutdown(false, true);
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}
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@Override
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public boolean isOutputShutdown() {
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return socket.isOutputShutdown();
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}
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@Override
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public boolean isInputShutdown() {
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return socket.isInputShutdown();
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}
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@Override
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public boolean isShutdown() {
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return socket.isShutdown();
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}
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@Override
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public Future<Void> shutdownOutput() {
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return shutdownOutput(newPromise());
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}
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@Override
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public Future<Void> shutdownOutput(final Promise<Void> promise) {
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EventLoop loop = executor();
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if (loop.inEventLoop()) {
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((AbstractUnsafe) unsafe()).shutdownOutput(promise);
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} else {
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loop.execute(() -> ((AbstractUnsafe) unsafe()).shutdownOutput(promise));
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}
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return promise.asFuture();
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}
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@Override
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public Future<Void> shutdownInput() {
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return shutdownInput(newPromise());
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}
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@Override
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public Future<Void> shutdownInput(final Promise<Void> promise) {
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EventLoop loop = executor();
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if (loop.inEventLoop()) {
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shutdownInput0(promise);
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} else {
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loop.execute(() -> shutdownInput0(promise));
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}
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return promise.asFuture();
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}
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private void shutdownInput0(Promise<Void> promise) {
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try {
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socket.shutdown(true, false);
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} catch (Throwable cause) {
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promise.setFailure(cause);
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return;
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}
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promise.setSuccess(null);
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}
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@Override
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public Future<Void> shutdown() {
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return shutdown(newPromise());
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}
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@Override
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public Future<Void> shutdown(final Promise<Void> promise) {
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Future<Void> shutdownOutputFuture = shutdownOutput();
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if (shutdownOutputFuture.isDone()) {
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shutdownOutputDone(promise, shutdownOutputFuture);
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} else {
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shutdownOutputFuture.addListener(promise, this::shutdownOutputDone);
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}
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return promise.asFuture();
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}
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private void shutdownOutputDone(Promise<Void> promise, Future<?> shutdownOutputFuture) {
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Future<Void> shutdownInputFuture = shutdownInput();
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if (shutdownInputFuture.isDone()) {
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shutdownDone(shutdownOutputFuture, shutdownInputFuture, promise);
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} else {
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shutdownInputFuture.addListener(shutdownInputFuture1 ->
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shutdownDone(shutdownOutputFuture, shutdownInputFuture1, promise));
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}
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}
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private static void shutdownDone(Future<?> shutdownOutputFuture,
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Future<?> shutdownInputFuture,
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Promise<Void> promise) {
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Throwable shutdownOutputCause = shutdownOutputFuture.cause();
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Throwable shutdownInputCause = shutdownInputFuture.cause();
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if (shutdownOutputCause != null) {
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if (shutdownInputCause != null) {
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logger.debug("Exception suppressed because a previous exception occurred.",
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shutdownInputCause);
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}
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promise.setFailure(shutdownOutputCause);
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} else if (shutdownInputCause != null) {
|
|
promise.setFailure(shutdownInputCause);
|
|
} else {
|
|
promise.setSuccess(null);
|
|
}
|
|
}
|
|
|
|
class KQueueStreamUnsafe extends AbstractKQueueUnsafe {
|
|
// Overridden here just to be able to access this method from AbstractKQueueStreamChannel
|
|
@Override
|
|
protected Executor prepareToClose() {
|
|
return super.prepareToClose();
|
|
}
|
|
|
|
@Override
|
|
void readReady(final KQueueRecvByteAllocatorHandle allocHandle) {
|
|
final ChannelConfig config = config();
|
|
if (shouldBreakReadReady(config)) {
|
|
clearReadFilter0();
|
|
return;
|
|
}
|
|
final ChannelPipeline pipeline = pipeline();
|
|
final ByteBufAllocator allocator = config.getAllocator();
|
|
allocHandle.reset(config);
|
|
readReadyBefore();
|
|
|
|
ByteBuf byteBuf = null;
|
|
boolean close = false;
|
|
try {
|
|
do {
|
|
// we use a direct buffer here as the native implementations only be able
|
|
// to handle direct buffers.
|
|
byteBuf = allocHandle.allocate(allocator);
|
|
allocHandle.lastBytesRead(doReadBytes(byteBuf));
|
|
if (allocHandle.lastBytesRead() <= 0) {
|
|
// nothing was read, release the buffer.
|
|
byteBuf.release();
|
|
byteBuf = null;
|
|
close = allocHandle.lastBytesRead() < 0;
|
|
if (close) {
|
|
// There is nothing left to read as we received an EOF.
|
|
readPending = false;
|
|
}
|
|
break;
|
|
}
|
|
allocHandle.incMessagesRead(1);
|
|
readPending = false;
|
|
pipeline.fireChannelRead(byteBuf);
|
|
byteBuf = null;
|
|
|
|
if (shouldBreakReadReady(config)) {
|
|
// We need to do this for two reasons:
|
|
//
|
|
// - If the input was shutdown in between (which may be the case when the user did it in the
|
|
// fireChannelRead(...) method we should not try to read again to not produce any
|
|
// miss-leading exceptions.
|
|
//
|
|
// - If the user closes the channel we need to ensure we not try to read from it again as
|
|
// the filedescriptor may be re-used already by the OS if the system is handling a lot of
|
|
// concurrent connections and so needs a lot of filedescriptors. If not do this we risk
|
|
// reading data from a filedescriptor that belongs to another socket then the socket that
|
|
// was "wrapped" by this Channel implementation.
|
|
break;
|
|
}
|
|
} while (allocHandle.continueReading());
|
|
|
|
allocHandle.readComplete();
|
|
pipeline.fireChannelReadComplete();
|
|
|
|
if (close) {
|
|
shutdownInput(false);
|
|
} else {
|
|
readIfIsAutoRead();
|
|
}
|
|
} catch (Throwable t) {
|
|
handleReadException(pipeline, byteBuf, t, close, allocHandle);
|
|
} finally {
|
|
readReadyFinally(config);
|
|
}
|
|
}
|
|
|
|
private void handleReadException(ChannelPipeline pipeline, ByteBuf byteBuf, Throwable cause, boolean close,
|
|
KQueueRecvByteAllocatorHandle allocHandle) {
|
|
if (byteBuf != null) {
|
|
if (byteBuf.isReadable()) {
|
|
readPending = false;
|
|
pipeline.fireChannelRead(byteBuf);
|
|
} else {
|
|
byteBuf.release();
|
|
}
|
|
}
|
|
if (!failConnectPromise(cause)) {
|
|
allocHandle.readComplete();
|
|
pipeline.fireChannelReadComplete();
|
|
pipeline.fireExceptionCaught(cause);
|
|
|
|
// If oom will close the read event, release connection.
|
|
// See https://github.com/netty/netty/issues/10434
|
|
if (close || cause instanceof OutOfMemoryError || cause instanceof IOException) {
|
|
shutdownInput(false);
|
|
} else {
|
|
readIfIsAutoRead();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private final class KQueueSocketWritableByteChannel extends SocketWritableByteChannel {
|
|
KQueueSocketWritableByteChannel() {
|
|
super(socket);
|
|
}
|
|
|
|
@Override
|
|
protected ByteBufAllocator alloc() {
|
|
return AbstractKQueueStreamChannel.this.alloc();
|
|
}
|
|
}
|
|
}
|