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ClientTransportConfig.java
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ClientTransportConfig.java
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/*
* Copyright (c) 2020-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* Licensed 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
*
* https://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.
*/
package reactor.netty.transport;
import java.net.SocketAddress;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Supplier;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.unix.DomainSocketChannel;
import io.netty.resolver.AddressResolverGroup;
import io.netty.resolver.dns.DnsAddressResolverGroup;
import reactor.netty.ChannelPipelineConfigurer;
import reactor.netty.Connection;
import reactor.netty.ConnectionObserver;
import reactor.netty.resources.ConnectionProvider;
import reactor.netty.resources.LoopResources;
import reactor.netty.internal.util.MapUtils;
import reactor.util.annotation.Nullable;
/**
* Encapsulate all necessary configuration for client transport. The public API is read-only.
*
* @param <CONF> Configuration implementation
* @author Stephane Maldini
* @author Violeta Georgieva
* @since 1.0.0
*/
public abstract class ClientTransportConfig<CONF extends TransportConfig> extends TransportConfig {
@Override
public int channelHash() {
return Objects.hash(super.channelHash(), proxyProvider, resolver);
}
/**
* Return the {@link ConnectionProvider}
*
* @return the {@link ConnectionProvider}
*/
public ConnectionProvider connectionProvider() {
return connectionProvider;
}
/**
* Return the configured callback or null
*
* @return the configured callback or null
*/
@Nullable
public final Consumer<? super CONF> doOnConnect() {
return doOnConnect;
}
/**
* Return the configured callback or null
*
* @return the configured callback or null
*/
@Nullable
public final Consumer<? super Connection> doOnConnected() {
return doOnConnected;
}
/**
* Return the configured callback or null
*
* @return the configured callback or null
*/
@Nullable
public final Consumer<? super Connection> doOnDisconnected() {
return doOnDisconnected;
}
/**
* Return true if that {@link ClientTransportConfig} is configured with a proxy
*
* @return true if that {@link ClientTransportConfig} is configured with a proxy
*/
public final boolean hasProxy() {
return proxyProvider != null;
}
/**
* Return the configured {@link NameResolverProvider} or null
*
* @return the configured {@link NameResolverProvider} or null
*/
@Nullable
public NameResolverProvider getNameResolverProvider() {
return nameResolverProvider;
}
/**
* Return the {@link ProxyProvider} if any or null
*
* @return the {@link ProxyProvider} if any or null
*/
@Nullable
public final ProxyProvider proxyProvider() {
return proxyProvider;
}
/**
* Return the remote configured {@link SocketAddress}
*
* @return the remote configured {@link SocketAddress}
*/
public final Supplier<? extends SocketAddress> remoteAddress() {
return remoteAddress;
}
/**
* Return the configured {@link AddressResolverGroup} or null.
* If there is no {@link AddressResolverGroup} configured, the default will be used.
*
* @return the configured {@link AddressResolverGroup} or null
*/
@Nullable
public final AddressResolverGroup<?> resolver() {
return resolver;
}
// Package private creators
final ConnectionProvider connectionProvider;
Consumer<? super CONF> doOnConnect;
Consumer<? super Connection> doOnConnected;
Consumer<? super Connection> doOnDisconnected;
Consumer<? super Connection> doOnResolve;
BiConsumer<? super Connection, ? super SocketAddress> doAfterResolve;
BiConsumer<? super Connection, ? super Throwable> doOnResolveError;
NameResolverProvider nameResolverProvider;
ProxyProvider proxyProvider;
Supplier<? extends SocketAddress> remoteAddress;
AddressResolverGroup<?> resolver;
protected ClientTransportConfig(ConnectionProvider connectionProvider, Map<ChannelOption<?>, ?> options,
Supplier<? extends SocketAddress> remoteAddress) {
super(options);
this.connectionProvider = Objects.requireNonNull(connectionProvider, "connectionProvider");
this.remoteAddress = Objects.requireNonNull(remoteAddress, "remoteAddress");
}
protected ClientTransportConfig(ClientTransportConfig<CONF> parent) {
super(parent);
this.connectionProvider = parent.connectionProvider;
this.doOnConnect = parent.doOnConnect;
this.doOnConnected = parent.doOnConnected;
this.doOnDisconnected = parent.doOnDisconnected;
this.doOnResolve = parent.doOnResolve;
this.doAfterResolve = parent.doAfterResolve;
this.doOnResolveError = parent.doOnResolveError;
this.nameResolverProvider = parent.nameResolverProvider;
this.proxyProvider = parent.proxyProvider;
this.remoteAddress = parent.remoteAddress;
this.resolver = parent.resolver;
}
@Override
protected Class<? extends Channel> channelType(boolean isDomainSocket) {
return isDomainSocket ? DomainSocketChannel.class : SocketChannel.class;
}
/**
* Provides a global {@link AddressResolverGroup} that is shared amongst all clients.
*
* @return the global {@link AddressResolverGroup}
*/
protected abstract AddressResolverGroup<?> defaultAddressResolverGroup();
@Override
protected ConnectionObserver defaultConnectionObserver() {
if (channelGroup() == null && doOnConnected() == null && doOnDisconnected() == null) {
return ConnectionObserver.emptyListener();
}
return new ClientTransportDoOn(channelGroup(), doOnConnected(), doOnDisconnected());
}
@Override
protected ChannelPipelineConfigurer defaultOnChannelInit() {
if (proxyProvider != null) {
return new ClientTransportChannelInitializer(proxyProvider);
}
else {
return ChannelPipelineConfigurer.emptyConfigurer();
}
}
@Override
protected EventLoopGroup eventLoopGroup() {
return loopResources().onClient(isPreferNative());
}
protected void proxyProvider(@Nullable ProxyProvider proxyProvider) {
this.proxyProvider = proxyProvider;
}
protected AddressResolverGroup<?> resolverInternal() {
AddressResolverGroup<?> resolverGroup = resolver != null ? resolver : defaultAddressResolverGroup();
if (metricsRecorder != null) {
return AddressResolverGroupMetrics.getOrCreate(resolverGroup, metricsRecorder);
}
else {
return resolverGroup;
}
}
static final ConcurrentMap<Integer, DnsAddressResolverGroup> RESOLVERS_CACHE = new ConcurrentHashMap<>();
static DnsAddressResolverGroup getOrCreateResolver(
NameResolverProvider nameResolverProvider,
LoopResources loopResources,
boolean preferNative) {
return MapUtils.computeIfAbsent(RESOLVERS_CACHE, Objects.hash(nameResolverProvider, loopResources, preferNative),
key -> nameResolverProvider.newNameResolverGroup(loopResources, preferNative));
}
static final NameResolverProvider DEFAULT_NAME_RESOLVER_PROVIDER = NameResolverProvider.builder().build();
static final class ClientTransportChannelInitializer implements ChannelPipelineConfigurer {
final ProxyProvider proxyProvider;
ClientTransportChannelInitializer(ProxyProvider proxyProvider) {
this.proxyProvider = proxyProvider;
}
@Override
public void onChannelInit(ConnectionObserver connectionObserver, Channel channel, SocketAddress remoteAddress) {
if (proxyProvider.shouldProxy(remoteAddress)) {
proxyProvider.addProxyHandler(channel);
}
}
}
static final class ClientTransportDoOn implements ConnectionObserver {
final ChannelGroup channelGroup;
final Consumer<? super Connection> doOnConnected;
final Consumer<? super Connection> doOnDisconnected;
ClientTransportDoOn(@Nullable ChannelGroup channelGroup,
@Nullable Consumer<? super Connection> doOnConnected,
@Nullable Consumer<? super Connection> doOnDisconnected) {
this.channelGroup = channelGroup;
this.doOnConnected = doOnConnected;
this.doOnDisconnected = doOnDisconnected;
}
@Override
public void onStateChange(Connection connection, State newState) {
if (channelGroup != null && newState == State.CONNECTED) {
channelGroup.add(connection.channel());
return;
}
if (doOnConnected != null && newState == State.CONFIGURED) {
doOnConnected.accept(connection);
return;
}
if (doOnDisconnected != null) {
if (newState == State.DISCONNECTING) {
connection.onDispose(() -> doOnDisconnected.accept(connection));
}
else if (newState == State.RELEASED) {
doOnDisconnected.accept(connection);
}
}
}
}
}