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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.nio;
import java.io.Closeable;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.AbstractSelectableChannel;
import java.util.function.Supplier;
public abstract class ChannelFactory {
private final boolean tcpNoDelay;
private final boolean tcpKeepAlive;
private final int tcpKeepIdle;
private final int tcpKeepInterval;
private final int tcpKeepCount;
private final boolean tcpReuseAddress;
private final int tcpSendBufferSize;
private final int tcpReceiveBufferSize;
private final ChannelFactory.RawChannelFactory rawChannelFactory;
/**
* This will create a {@link ChannelFactory}.
*/
protected ChannelFactory(
boolean tcpNoDelay,
boolean tcpKeepAlive,
int tcpKeepIdle,
int tcpKeepInterval,
int tcpKeepCount,
boolean tcpReuseAddress,
int tcpSendBufferSize,
int tcpReceiveBufferSize
) {
this(
tcpNoDelay,
tcpKeepAlive,
tcpKeepIdle,
tcpKeepInterval,
tcpKeepCount,
tcpReuseAddress,
tcpSendBufferSize,
tcpReceiveBufferSize,
new RawChannelFactory()
);
}
/**
* This will create a {@link ChannelFactory} using the raw channel factory passed to the constructor.
*/
protected ChannelFactory(
boolean tcpNoDelay,
boolean tcpKeepAlive,
int tcpKeepIdle,
int tcpKeepInterval,
int tcpKeepCount,
boolean tcpReuseAddress,
int tcpSendBufferSize,
int tcpReceiveBufferSize,
RawChannelFactory rawChannelFactory
) {
this.tcpNoDelay = tcpNoDelay;
this.tcpKeepAlive = tcpKeepAlive;
this.tcpKeepIdle = tcpKeepIdle;
this.tcpKeepInterval = tcpKeepInterval;
this.tcpKeepCount = tcpKeepCount;
this.tcpReuseAddress = tcpReuseAddress;
this.tcpSendBufferSize = tcpSendBufferSize;
this.tcpReceiveBufferSize = tcpReceiveBufferSize;
this.rawChannelFactory = rawChannelFactory;
}
public Socket openNioChannel(InetSocketAddress remoteAddress, Supplier supplier) throws IOException {
SocketChannel rawChannel = rawChannelFactory.openNioChannel();
setNonBlocking(rawChannel);
NioSelector selector = supplier.get();
Socket channel = internalCreateChannel(selector, rawChannel, createSocketConfig(remoteAddress, false));
scheduleChannel(channel, selector);
return channel;
}
public Socket acceptNioChannel(SocketChannel rawChannel, Supplier supplier) throws IOException {
setNonBlocking(rawChannel);
NioSelector selector = supplier.get();
InetSocketAddress remoteAddress = getRemoteAddress(rawChannel);
Socket channel = internalCreateChannel(selector, rawChannel, createSocketConfig(remoteAddress, true));
scheduleChannel(channel, selector);
return channel;
}
public ServerSocket openNioServerSocketChannel(InetSocketAddress localAddress, Supplier supplier) throws IOException {
ServerSocketChannel rawChannel = rawChannelFactory.openNioServerSocketChannel();
setNonBlocking(rawChannel);
NioSelector selector = supplier.get();
Config.ServerSocket config = new Config.ServerSocket(tcpReuseAddress, localAddress);
ServerSocket serverChannel = internalCreateServerChannel(selector, rawChannel, config);
scheduleServerChannel(serverChannel, selector);
return serverChannel;
}
/**
* This method should return a new {@link NioSocketChannel} implementation. When this method has
* returned, the channel should be fully created and setup. Read and write contexts and the channel
* exception handler should have been set.
*
* @param selector the channel will be registered with
* @param channel the raw channel
* @param socketConfig the socket config
* @return the channel
* @throws IOException related to the creation of the channel
*/
public abstract Socket createChannel(NioSelector selector, SocketChannel channel, Config.Socket socketConfig) throws IOException;
/**
* This method should return a new {@link NioServerSocketChannel} implementation. When this method has
* returned, the channel should be fully created and setup.
*
* @param selector the channel will be registered with
* @param channel the raw channel
* @param socketConfig the socket config
* @return the server channel
* @throws IOException related to the creation of the channel
*/
public abstract ServerSocket createServerChannel(NioSelector selector, ServerSocketChannel channel, Config.ServerSocket socketConfig)
throws IOException;
protected InetSocketAddress getRemoteAddress(SocketChannel rawChannel) throws IOException {
InetSocketAddress remoteAddress = (InetSocketAddress) rawChannel.socket().getRemoteSocketAddress();
if (remoteAddress == null) {
throw new IOException("Accepted socket does not have remote address");
}
return remoteAddress;
}
private Socket internalCreateChannel(NioSelector selector, SocketChannel rawChannel, Config.Socket config) throws IOException {
try {
Socket channel = createChannel(selector, rawChannel, config);
assert channel.getContext() != null : "channel context should have been set on channel";
return channel;
} catch (UncheckedIOException e) {
// This can happen if getRemoteAddress throws IOException.
IOException cause = e.getCause();
closeRawChannel(rawChannel, cause);
throw cause;
} catch (Exception e) {
closeRawChannel(rawChannel, e);
throw e;
}
}
private ServerSocket internalCreateServerChannel(NioSelector selector, ServerSocketChannel rawChannel, Config.ServerSocket config)
throws IOException {
try {
return createServerChannel(selector, rawChannel, config);
} catch (Exception e) {
closeRawChannel(rawChannel, e);
throw e;
}
}
private void scheduleChannel(Socket channel, NioSelector selector) {
try {
selector.scheduleForRegistration(channel);
} catch (IllegalStateException e) {
closeRawChannel(channel.getRawChannel(), e);
throw e;
}
}
private void scheduleServerChannel(ServerSocket channel, NioSelector selector) {
try {
selector.scheduleForRegistration(channel);
} catch (IllegalStateException e) {
closeRawChannel(channel.getRawChannel(), e);
throw e;
}
}
private void setNonBlocking(AbstractSelectableChannel rawChannel) throws IOException {
try {
rawChannel.configureBlocking(false);
} catch (IOException e) {
closeRawChannel(rawChannel, e);
throw e;
}
}
private static void closeRawChannel(Closeable c, Exception e) {
try {
c.close();
} catch (IOException closeException) {
e.addSuppressed(closeException);
}
}
private Config.Socket createSocketConfig(InetSocketAddress remoteAddress, boolean isAccepted) {
return new Config.Socket(
tcpNoDelay,
tcpKeepAlive,
tcpKeepIdle,
tcpKeepInterval,
tcpKeepCount,
tcpReuseAddress,
tcpSendBufferSize,
tcpReceiveBufferSize,
remoteAddress,
isAccepted
);
}
public static class RawChannelFactory {
SocketChannel openNioChannel() throws IOException {
return SocketChannel.open();
}
ServerSocketChannel openNioServerSocketChannel() throws IOException {
return ServerSocketChannel.open();
}
}
}
