f7fadd67dd
Motivation: Netty uses epoll edge-triggered by default forever and there is really not reason why someone should use level-triggered (its considered a implementation detail). Modifications: - Remove code that was related to level-triggered mode - Adjust testclass names Result: Fixes https://github.com/netty/netty/issues/9349
693 lines
26 KiB
Java
693 lines
26 KiB
Java
/*
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* Copyright 2014 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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* http://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.epoll;
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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.buffer.Unpooled;
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import io.netty.channel.AddressedEnvelope;
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import io.netty.channel.ChannelFuture;
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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.ChannelPromise;
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import io.netty.channel.DefaultAddressedEnvelope;
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import io.netty.channel.EventLoop;
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import io.netty.channel.socket.DatagramChannel;
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import io.netty.channel.socket.DatagramChannelConfig;
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import io.netty.channel.socket.DatagramPacket;
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import io.netty.channel.socket.InternetProtocolFamily;
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import io.netty.channel.unix.DatagramSocketAddress;
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import io.netty.channel.unix.Errors;
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import io.netty.channel.unix.Errors.NativeIoException;
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import io.netty.channel.unix.IovArray;
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import io.netty.channel.unix.Socket;
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import io.netty.channel.unix.UnixChannelUtil;
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import io.netty.util.ReferenceCountUtil;
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import io.netty.util.internal.RecyclableArrayList;
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import io.netty.util.internal.StringUtil;
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import java.io.IOException;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.NetworkInterface;
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import java.net.PortUnreachableException;
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import java.net.SocketAddress;
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import java.nio.ByteBuffer;
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import static io.netty.channel.epoll.LinuxSocket.newSocketDgram;
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import static java.util.Objects.requireNonNull;
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/**
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* {@link DatagramChannel} implementation that uses linux EPOLL Edge-Triggered Mode for
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* maximal performance.
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*/
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public final class EpollDatagramChannel extends AbstractEpollChannel implements DatagramChannel {
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private static final ChannelMetadata METADATA = new ChannelMetadata(true);
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private static final String EXPECTED_TYPES =
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" (expected: " + StringUtil.simpleClassName(DatagramPacket.class) + ", " +
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StringUtil.simpleClassName(AddressedEnvelope.class) + '<' +
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StringUtil.simpleClassName(ByteBuf.class) + ", " +
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StringUtil.simpleClassName(InetSocketAddress.class) + ">, " +
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StringUtil.simpleClassName(ByteBuf.class) + ')';
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private final EpollDatagramChannelConfig config;
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private volatile boolean connected;
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/**
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* Create a new instance which selects the {@link InternetProtocolFamily} to use depending
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* on the Operation Systems default which will be chosen.
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*/
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public EpollDatagramChannel(EventLoop eventLoop) {
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this(eventLoop, null);
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}
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/**
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* Create a new instance using the given {@link InternetProtocolFamily}. If {@code null} is used it will depend
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* on the Operation Systems default which will be chosen.
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*/
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public EpollDatagramChannel(EventLoop eventLoop, InternetProtocolFamily family) {
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this(eventLoop, family == null ?
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newSocketDgram(Socket.isIPv6Preferred()) :
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newSocketDgram(family == InternetProtocolFamily.IPv6),
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false);
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}
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/**
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* Create a new instance which selects the {@link InternetProtocolFamily} to use depending
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* on the Operation Systems default which will be chosen.
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*/
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public EpollDatagramChannel(EventLoop eventLoop, int fd) {
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this(eventLoop, new LinuxSocket(fd), true);
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}
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private EpollDatagramChannel(EventLoop eventLoop, LinuxSocket fd, boolean active) {
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super(null, eventLoop, fd, active);
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config = new EpollDatagramChannelConfig(this);
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}
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@Override
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public InetSocketAddress remoteAddress() {
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return (InetSocketAddress) super.remoteAddress();
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}
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@Override
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public InetSocketAddress localAddress() {
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return (InetSocketAddress) super.localAddress();
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}
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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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@Override
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@SuppressWarnings("deprecation")
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public boolean isActive() {
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return socket.isOpen() && (config.getActiveOnOpen() && isRegistered() || active);
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}
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@Override
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public boolean isConnected() {
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return connected;
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}
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@Override
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public ChannelFuture joinGroup(InetAddress multicastAddress) {
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return joinGroup(multicastAddress, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(InetAddress multicastAddress, ChannelPromise promise) {
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try {
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return joinGroup(
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multicastAddress,
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NetworkInterface.getByInetAddress(localAddress().getAddress()), null, promise);
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} catch (IOException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture joinGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
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return joinGroup(multicastAddress, networkInterface, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface,
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ChannelPromise promise) {
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return joinGroup(multicastAddress.getAddress(), networkInterface, null, promise);
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}
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@Override
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public ChannelFuture joinGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source) {
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return joinGroup(multicastAddress, networkInterface, source, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(
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final InetAddress multicastAddress, final NetworkInterface networkInterface,
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final InetAddress source, final ChannelPromise promise) {
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requireNonNull(multicastAddress, "multicastAddress");
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requireNonNull(networkInterface, "networkInterface");
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try {
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socket.joinGroup(multicastAddress, networkInterface, source);
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promise.setSuccess();
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} catch (IOException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture leaveGroup(InetAddress multicastAddress) {
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return leaveGroup(multicastAddress, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(InetAddress multicastAddress, ChannelPromise promise) {
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try {
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return leaveGroup(
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multicastAddress, NetworkInterface.getByInetAddress(localAddress().getAddress()), null, promise);
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} catch (IOException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture leaveGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
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return leaveGroup(multicastAddress, networkInterface, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(
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InetSocketAddress multicastAddress,
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NetworkInterface networkInterface, ChannelPromise promise) {
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return leaveGroup(multicastAddress.getAddress(), networkInterface, null, promise);
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}
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@Override
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public ChannelFuture leaveGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source) {
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return leaveGroup(multicastAddress, networkInterface, source, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(
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final InetAddress multicastAddress, final NetworkInterface networkInterface, final InetAddress source,
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final ChannelPromise promise) {
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requireNonNull(multicastAddress, "multicastAddress");
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requireNonNull(networkInterface, "networkInterface");
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try {
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socket.leaveGroup(multicastAddress, networkInterface, source);
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promise.setSuccess();
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} catch (IOException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture block(
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InetAddress multicastAddress, NetworkInterface networkInterface,
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InetAddress sourceToBlock) {
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return block(multicastAddress, networkInterface, sourceToBlock, newPromise());
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}
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@Override
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public ChannelFuture block(
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final InetAddress multicastAddress, final NetworkInterface networkInterface,
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final InetAddress sourceToBlock, final ChannelPromise promise) {
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requireNonNull(multicastAddress, "multicastAddress");
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requireNonNull(sourceToBlock, "sourceToBlock");
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requireNonNull(networkInterface, "networkInterface");
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promise.setFailure(new UnsupportedOperationException("Multicast not supported"));
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return promise;
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}
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@Override
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public ChannelFuture block(InetAddress multicastAddress, InetAddress sourceToBlock) {
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return block(multicastAddress, sourceToBlock, newPromise());
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}
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@Override
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public ChannelFuture block(
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InetAddress multicastAddress, InetAddress sourceToBlock, ChannelPromise promise) {
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try {
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return block(
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multicastAddress,
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NetworkInterface.getByInetAddress(localAddress().getAddress()),
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sourceToBlock, promise);
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} catch (Throwable e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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protected AbstractEpollUnsafe newUnsafe() {
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return new EpollDatagramChannelUnsafe();
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}
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@Override
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protected void doBind(SocketAddress localAddress) throws Exception {
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if (localAddress instanceof InetSocketAddress) {
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InetSocketAddress socketAddress = (InetSocketAddress) localAddress;
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if (socketAddress.getAddress().isAnyLocalAddress() &&
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socketAddress.getAddress() instanceof Inet4Address && Socket.isIPv6Preferred()) {
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localAddress = new InetSocketAddress(LinuxSocket.INET6_ANY, socketAddress.getPort());
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}
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}
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super.doBind(localAddress);
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active = true;
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}
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@Override
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protected void doWrite(ChannelOutboundBuffer in) throws Exception {
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for (;;) {
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Object msg = in.current();
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if (msg == null) {
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// Wrote all messages.
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clearFlag(Native.EPOLLOUT);
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break;
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}
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try {
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// Check if sendmmsg(...) is supported which is only the case for GLIBC 2.14+
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if (Native.IS_SUPPORTING_SENDMMSG && in.size() > 1) {
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NativeDatagramPacketArray array = cleanDatagramPacketArray();
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array.add(in, isConnected());
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int cnt = array.count();
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if (cnt >= 1) {
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// Try to use gathering writes via sendmmsg(...) syscall.
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int offset = 0;
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NativeDatagramPacketArray.NativeDatagramPacket[] packets = array.packets();
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while (cnt > 0) {
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int send = socket.sendmmsg(packets, offset, cnt);
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if (send == 0) {
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// Did not write all messages.
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setFlag(Native.EPOLLOUT);
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return;
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}
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for (int i = 0; i < send; i++) {
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in.remove();
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}
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cnt -= send;
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offset += send;
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}
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continue;
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}
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}
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boolean done = false;
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for (int i = config().getWriteSpinCount(); i > 0; --i) {
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if (doWriteMessage(msg)) {
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done = true;
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break;
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}
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}
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if (done) {
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in.remove();
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} else {
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// Did not write all messages.
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setFlag(Native.EPOLLOUT);
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break;
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}
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} catch (IOException e) {
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// Continue on write error as a DatagramChannel can write to multiple remote peers
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//
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// See https://github.com/netty/netty/issues/2665
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in.remove(e);
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}
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}
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}
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private boolean doWriteMessage(Object msg) throws Exception {
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final ByteBuf data;
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InetSocketAddress remoteAddress;
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if (msg instanceof AddressedEnvelope) {
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@SuppressWarnings("unchecked")
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AddressedEnvelope<ByteBuf, InetSocketAddress> envelope =
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(AddressedEnvelope<ByteBuf, InetSocketAddress>) msg;
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data = envelope.content();
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remoteAddress = envelope.recipient();
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} else {
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data = (ByteBuf) msg;
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remoteAddress = null;
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}
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final int dataLen = data.readableBytes();
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if (dataLen == 0) {
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return true;
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}
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final long writtenBytes;
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if (data.hasMemoryAddress()) {
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long memoryAddress = data.memoryAddress();
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if (remoteAddress == null) {
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writtenBytes = socket.writeAddress(memoryAddress, data.readerIndex(), data.writerIndex());
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} else {
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writtenBytes = socket.sendToAddress(memoryAddress, data.readerIndex(), data.writerIndex(),
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remoteAddress.getAddress(), remoteAddress.getPort());
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}
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} else if (data.nioBufferCount() > 1) {
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IovArray array = registration().cleanIovArray();
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array.add(data, data.readerIndex(), data.readableBytes());
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int cnt = array.count();
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assert cnt != 0;
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if (remoteAddress == null) {
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writtenBytes = socket.writevAddresses(array.memoryAddress(0), cnt);
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} else {
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writtenBytes = socket.sendToAddresses(array.memoryAddress(0), cnt,
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remoteAddress.getAddress(), remoteAddress.getPort());
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}
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} else {
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ByteBuffer nioData = data.internalNioBuffer(data.readerIndex(), data.readableBytes());
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if (remoteAddress == null) {
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writtenBytes = socket.write(nioData, nioData.position(), nioData.limit());
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} else {
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writtenBytes = socket.sendTo(nioData, nioData.position(), nioData.limit(),
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remoteAddress.getAddress(), remoteAddress.getPort());
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}
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}
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return writtenBytes > 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 DatagramPacket) {
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DatagramPacket packet = (DatagramPacket) msg;
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ByteBuf content = packet.content();
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return UnixChannelUtil.isBufferCopyNeededForWrite(content) ?
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new DatagramPacket(newDirectBuffer(packet, content), packet.recipient()) : msg;
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}
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if (msg instanceof ByteBuf) {
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ByteBuf buf = (ByteBuf) msg;
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return UnixChannelUtil.isBufferCopyNeededForWrite(buf)? newDirectBuffer(buf) : buf;
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}
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if (msg instanceof AddressedEnvelope) {
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@SuppressWarnings("unchecked")
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AddressedEnvelope<Object, SocketAddress> e = (AddressedEnvelope<Object, SocketAddress>) msg;
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if (e.content() instanceof ByteBuf &&
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(e.recipient() == null || e.recipient() instanceof InetSocketAddress)) {
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ByteBuf content = (ByteBuf) e.content();
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return UnixChannelUtil.isBufferCopyNeededForWrite(content)?
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new DefaultAddressedEnvelope<>(
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newDirectBuffer(e, content), (InetSocketAddress) e.recipient()) : e;
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}
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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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@Override
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public EpollDatagramChannelConfig config() {
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return config;
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}
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@Override
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protected void doDisconnect() throws Exception {
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socket.disconnect();
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connected = active = false;
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resetCachedAddresses();
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}
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@Override
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protected boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) throws Exception {
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if (super.doConnect(remoteAddress, localAddress)) {
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connected = true;
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return true;
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}
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return false;
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}
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@Override
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protected void doClose() throws Exception {
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super.doClose();
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connected = false;
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}
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final class EpollDatagramChannelUnsafe extends AbstractEpollUnsafe {
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@Override
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void epollInReady() {
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assert eventLoop().inEventLoop();
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DatagramChannelConfig config = config();
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if (shouldBreakEpollInReady(config)) {
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clearEpollIn0();
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return;
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}
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final EpollRecvByteAllocatorHandle allocHandle = recvBufAllocHandle();
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final ChannelPipeline pipeline = pipeline();
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final ByteBufAllocator allocator = config.getAllocator();
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allocHandle.reset(config);
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epollInBefore();
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Throwable exception = null;
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try {
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try {
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boolean connected = isConnected();
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do {
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ByteBuf byteBuf = allocHandle.allocate(allocator);
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final boolean read;
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int datagramSize = config().getMaxDatagramPayloadSize();
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// Only try to use recvmmsg if its really supported by the running system.
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int numDatagram = Native.IS_SUPPORTING_RECVMMSG ?
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datagramSize == 0 ? 1 : byteBuf.writableBytes() / datagramSize :
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0;
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try {
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if (numDatagram <= 1) {
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if (connected) {
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read = connectedRead(allocHandle, byteBuf, datagramSize);
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} else {
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read = read(allocHandle, byteBuf, datagramSize);
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}
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} else {
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// Try to use scattering reads via recvmmsg(...) syscall.
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read = scatteringRead(allocHandle, byteBuf, datagramSize, numDatagram);
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}
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} catch (NativeIoException e) {
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if (connected) {
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throw translateForConnected(e);
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}
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throw e;
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}
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if (read) {
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readPending = false;
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} else {
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break;
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}
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} while (allocHandle.continueReading());
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} catch (Throwable t) {
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exception = t;
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}
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allocHandle.readComplete();
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pipeline.fireChannelReadComplete();
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if (exception != null) {
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pipeline.fireExceptionCaught(exception);
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}
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readIfIsAutoRead();
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} finally {
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epollInFinally(config);
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}
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}
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}
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private boolean connectedRead(EpollRecvByteAllocatorHandle allocHandle, ByteBuf byteBuf, int maxDatagramPacketSize)
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throws Exception {
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try {
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int writable = maxDatagramPacketSize != 0 ? Math.min(byteBuf.writableBytes(), maxDatagramPacketSize)
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: byteBuf.writableBytes();
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allocHandle.attemptedBytesRead(writable);
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|
|
int writerIndex = byteBuf.writerIndex();
|
|
int localReadAmount;
|
|
if (byteBuf.hasMemoryAddress()) {
|
|
localReadAmount = socket.readAddress(byteBuf.memoryAddress(), writerIndex, writerIndex + writable);
|
|
} else {
|
|
ByteBuffer buf = byteBuf.internalNioBuffer(writerIndex, writable);
|
|
localReadAmount = socket.read(buf, buf.position(), buf.limit());
|
|
}
|
|
|
|
if (localReadAmount <= 0) {
|
|
allocHandle.lastBytesRead(localReadAmount);
|
|
|
|
// nothing was read, release the buffer.
|
|
return false;
|
|
}
|
|
byteBuf.writerIndex(writerIndex + localReadAmount);
|
|
|
|
allocHandle.lastBytesRead(maxDatagramPacketSize <= 0 ?
|
|
localReadAmount : writable);
|
|
|
|
DatagramPacket packet = new DatagramPacket(byteBuf, localAddress(), remoteAddress());
|
|
allocHandle.incMessagesRead(1);
|
|
|
|
pipeline().fireChannelRead(packet);
|
|
byteBuf = null;
|
|
return true;
|
|
} finally {
|
|
if (byteBuf != null) {
|
|
byteBuf.release();
|
|
}
|
|
}
|
|
}
|
|
|
|
private IOException translateForConnected(NativeIoException e) {
|
|
// We need to correctly translate connect errors to match NIO behaviour.
|
|
if (e.expectedErr() == Errors.ERROR_ECONNREFUSED_NEGATIVE) {
|
|
PortUnreachableException error = new PortUnreachableException(e.getMessage());
|
|
error.initCause(e);
|
|
return error;
|
|
}
|
|
return e;
|
|
}
|
|
|
|
private boolean scatteringRead(EpollRecvByteAllocatorHandle allocHandle,
|
|
ByteBuf byteBuf, int datagramSize, int numDatagram) throws IOException {
|
|
RecyclableArrayList bufferPackets = null;
|
|
try {
|
|
int offset = byteBuf.writerIndex();
|
|
NativeDatagramPacketArray array = cleanDatagramPacketArray();
|
|
|
|
for (int i = 0; i < numDatagram; i++, offset += datagramSize) {
|
|
if (!array.addWritable(byteBuf, offset, datagramSize)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
allocHandle.attemptedBytesRead(offset - byteBuf.writerIndex());
|
|
|
|
NativeDatagramPacketArray.NativeDatagramPacket[] packets = array.packets();
|
|
|
|
int received = socket.recvmmsg(packets, 0, array.count());
|
|
if (received == 0) {
|
|
allocHandle.lastBytesRead(-1);
|
|
return false;
|
|
}
|
|
int bytesReceived = received * datagramSize;
|
|
byteBuf.writerIndex(bytesReceived);
|
|
InetSocketAddress local = localAddress();
|
|
if (received == 1) {
|
|
// Single packet fast-path
|
|
DatagramPacket packet = packets[0].newDatagramPacket(byteBuf, local);
|
|
allocHandle.lastBytesRead(datagramSize);
|
|
allocHandle.incMessagesRead(1);
|
|
pipeline().fireChannelRead(packet);
|
|
byteBuf = null;
|
|
return true;
|
|
}
|
|
|
|
// Its important that we process all received data out of the NativeDatagramPacketArray
|
|
// before we call fireChannelRead(...). This is because the user may call flush()
|
|
// in a channelRead(...) method and so may re-use the NativeDatagramPacketArray again.
|
|
bufferPackets = RecyclableArrayList.newInstance();
|
|
for (int i = 0; i < received; i++) {
|
|
DatagramPacket packet = packets[i].newDatagramPacket(byteBuf.readRetainedSlice(datagramSize), local);
|
|
bufferPackets.add(packet);
|
|
}
|
|
|
|
allocHandle.lastBytesRead(bytesReceived);
|
|
allocHandle.incMessagesRead(received);
|
|
|
|
for (int i = 0; i < received; i++) {
|
|
pipeline().fireChannelRead(bufferPackets.set(i, Unpooled.EMPTY_BUFFER));
|
|
}
|
|
bufferPackets.recycle();
|
|
bufferPackets = null;
|
|
return true;
|
|
} finally {
|
|
if (byteBuf != null) {
|
|
byteBuf.release();
|
|
}
|
|
if (bufferPackets != null) {
|
|
for (int i = 0; i < bufferPackets.size(); i++) {
|
|
ReferenceCountUtil.release(bufferPackets.get(i));
|
|
}
|
|
bufferPackets.recycle();
|
|
}
|
|
}
|
|
}
|
|
|
|
private boolean read(EpollRecvByteAllocatorHandle allocHandle, ByteBuf byteBuf, int maxDatagramPacketSize)
|
|
throws IOException {
|
|
try {
|
|
int writable = maxDatagramPacketSize != 0 ? Math.min(byteBuf.writableBytes(), maxDatagramPacketSize)
|
|
: byteBuf.writableBytes();
|
|
allocHandle.attemptedBytesRead(writable);
|
|
int writerIndex = byteBuf.writerIndex();
|
|
final DatagramSocketAddress remoteAddress;
|
|
if (byteBuf.hasMemoryAddress()) {
|
|
// has a memory address so use optimized call
|
|
remoteAddress = socket.recvFromAddress(
|
|
byteBuf.memoryAddress(), writerIndex, writerIndex + writable);
|
|
} else {
|
|
ByteBuffer nioData = byteBuf.internalNioBuffer(writerIndex, writable);
|
|
remoteAddress = socket.recvFrom(nioData, nioData.position(), nioData.limit());
|
|
}
|
|
|
|
if (remoteAddress == null) {
|
|
allocHandle.lastBytesRead(-1);
|
|
return false;
|
|
}
|
|
InetSocketAddress localAddress = remoteAddress.localAddress();
|
|
if (localAddress == null) {
|
|
localAddress = localAddress();
|
|
}
|
|
int received = remoteAddress.receivedAmount();
|
|
allocHandle.lastBytesRead(maxDatagramPacketSize <= 0 ?
|
|
received : writable);
|
|
byteBuf.writerIndex(writerIndex + received);
|
|
allocHandle.incMessagesRead(1);
|
|
|
|
pipeline().fireChannelRead(new DatagramPacket(byteBuf, localAddress, remoteAddress));
|
|
byteBuf = null;
|
|
return true;
|
|
} finally {
|
|
if (byteBuf != null) {
|
|
byteBuf.release();
|
|
}
|
|
}
|
|
}
|
|
|
|
private NativeDatagramPacketArray cleanDatagramPacketArray() {
|
|
return registration().cleanDatagramPacketArray();
|
|
}
|
|
}
|