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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.transport;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodeRole;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.util.concurrent.CountDown;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import java.util.stream.Stream;
import static org.elasticsearch.common.settings.Setting.intSetting;
public class ProxyConnectionStrategy extends RemoteConnectionStrategy {
/**
* The remote address for the proxy. The connections will be opened to the configured address.
*/
public static final Setting.AffixSetting PROXY_ADDRESS = Setting.affixKeySetting(
"cluster.remote.",
"proxy_address",
(ns, key) -> Setting.simpleString(key, new StrategyValidator<>(ns, key, ConnectionStrategy.PROXY, s -> {
if (Strings.hasLength(s)) {
parsePort(s);
}
}), Setting.Property.Dynamic, Setting.Property.NodeScope)
);
/**
* The maximum number of socket connections that will be established to a remote cluster. The default is 18.
*/
public static final Setting.AffixSetting REMOTE_SOCKET_CONNECTIONS = Setting.affixKeySetting(
"cluster.remote.",
"proxy_socket_connections",
(ns, key) -> intSetting(
key,
18,
1,
new StrategyValidator<>(ns, key, ConnectionStrategy.PROXY),
Setting.Property.Dynamic,
Setting.Property.NodeScope
)
);
/**
* A configurable server_name attribute
*/
public static final Setting.AffixSetting SERVER_NAME = Setting.affixKeySetting(
"cluster.remote.",
"server_name",
(ns, key) -> Setting.simpleString(
key,
new StrategyValidator<>(ns, key, ConnectionStrategy.PROXY),
Setting.Property.Dynamic,
Setting.Property.NodeScope
)
);
static final int CHANNELS_PER_CONNECTION = 1;
private static final int MAX_CONNECT_ATTEMPTS_PER_RUN = 3;
private final int maxNumConnections;
private final String configuredAddress;
private final String configuredServerName;
private final Supplier address;
private final AtomicReference remoteClusterName = new AtomicReference<>();
private final ConnectionManager.ConnectionValidator clusterNameValidator;
ProxyConnectionStrategy(
String clusterAlias,
TransportService transportService,
RemoteConnectionManager connectionManager,
Settings settings
) {
this(
clusterAlias,
transportService,
connectionManager,
settings,
REMOTE_SOCKET_CONNECTIONS.getConcreteSettingForNamespace(clusterAlias).get(settings),
PROXY_ADDRESS.getConcreteSettingForNamespace(clusterAlias).get(settings),
SERVER_NAME.getConcreteSettingForNamespace(clusterAlias).get(settings)
);
}
ProxyConnectionStrategy(
String clusterAlias,
TransportService transportService,
RemoteConnectionManager connectionManager,
Settings settings,
int maxNumConnections,
String configuredAddress
) {
this(
clusterAlias,
transportService,
connectionManager,
settings,
maxNumConnections,
configuredAddress,
() -> resolveAddress(configuredAddress),
null
);
}
ProxyConnectionStrategy(
String clusterAlias,
TransportService transportService,
RemoteConnectionManager connectionManager,
Settings settings,
int maxNumConnections,
String configuredAddress,
String configuredServerName
) {
this(
clusterAlias,
transportService,
connectionManager,
settings,
maxNumConnections,
configuredAddress,
() -> resolveAddress(configuredAddress),
configuredServerName
);
}
ProxyConnectionStrategy(
String clusterAlias,
TransportService transportService,
RemoteConnectionManager connectionManager,
Settings settings,
int maxNumConnections,
String configuredAddress,
Supplier address,
String configuredServerName
) {
super(clusterAlias, transportService, connectionManager, settings);
this.maxNumConnections = maxNumConnections;
this.configuredAddress = configuredAddress;
this.configuredServerName = configuredServerName;
assert Strings.isEmpty(configuredAddress) == false : "Cannot use proxy connection strategy with no configured addresses";
this.address = address;
this.clusterNameValidator = (newConnection, actualProfile, listener) -> transportService.handshake(
newConnection,
actualProfile.getHandshakeTimeout(),
cn -> true,
listener.map(resp -> {
ClusterName remote = resp.getClusterName();
if (remoteClusterName.compareAndSet(null, remote)) {
return null;
} else {
if (remoteClusterName.get().equals(remote) == false) {
DiscoveryNode node = newConnection.getNode();
throw new ConnectTransportException(node, "handshake failed. unexpected remote cluster name " + remote);
}
return null;
}
})
);
}
static Stream> enablementSettings() {
return Stream.of(ProxyConnectionStrategy.PROXY_ADDRESS);
}
static Writeable.Reader infoReader() {
return ProxyModeInfo::new;
}
@Override
protected boolean shouldOpenMoreConnections() {
return connectionManager.size() < maxNumConnections;
}
@Override
protected boolean strategyMustBeRebuilt(Settings newSettings) {
String address = PROXY_ADDRESS.getConcreteSettingForNamespace(clusterAlias).get(newSettings);
int numOfSockets = REMOTE_SOCKET_CONNECTIONS.getConcreteSettingForNamespace(clusterAlias).get(newSettings);
String serverName = SERVER_NAME.getConcreteSettingForNamespace(clusterAlias).get(newSettings);
return numOfSockets != maxNumConnections
|| configuredAddress.equals(address) == false
|| Objects.equals(serverName, configuredServerName) == false;
}
@Override
protected ConnectionStrategy strategyType() {
return ConnectionStrategy.PROXY;
}
@Override
protected void connectImpl(ActionListener listener) {
performProxyConnectionProcess(listener);
}
@Override
public RemoteConnectionInfo.ModeInfo getModeInfo() {
return new ProxyModeInfo(configuredAddress, configuredServerName, maxNumConnections, connectionManager.size());
}
private void performProxyConnectionProcess(ActionListener listener) {
openConnections(listener, 1);
}
private void openConnections(ActionListener finished, int attemptNumber) {
if (attemptNumber <= MAX_CONNECT_ATTEMPTS_PER_RUN) {
TransportAddress resolved = address.get();
int remaining = maxNumConnections - connectionManager.size();
ActionListener compositeListener = new ActionListener() {
private final AtomicInteger successfulConnections = new AtomicInteger(0);
private final CountDown countDown = new CountDown(remaining);
@Override
public void onResponse(Void v) {
successfulConnections.incrementAndGet();
if (countDown.countDown()) {
if (shouldOpenMoreConnections()) {
openConnections(finished, attemptNumber + 1);
} else {
finished.onResponse(v);
}
}
}
@Override
public void onFailure(Exception e) {
if (countDown.countDown()) {
openConnections(finished, attemptNumber + 1);
}
}
};
for (int i = 0; i < remaining; ++i) {
String id = clusterAlias + "#" + resolved;
Map attributes;
if (Strings.isNullOrEmpty(configuredServerName)) {
attributes = Collections.emptyMap();
} else {
attributes = Collections.singletonMap("server_name", configuredServerName);
}
DiscoveryNode node = new DiscoveryNode(
id,
resolved,
attributes,
DiscoveryNodeRole.BUILT_IN_ROLES,
Version.CURRENT.minimumCompatibilityVersion()
);
connectionManager.connectToRemoteClusterNode(node, clusterNameValidator, compositeListener.delegateResponse((l, e) -> {
logger.debug(
new ParameterizedMessage(
"failed to open remote connection [remote cluster: {}, address: {}]",
clusterAlias,
resolved
),
e
);
l.onFailure(e);
}));
}
} else {
int openConnections = connectionManager.size();
if (openConnections == 0) {
finished.onFailure(
new IllegalStateException("Unable to open any proxy connections to remote cluster [" + clusterAlias + "]")
);
} else {
logger.debug(
"unable to open maximum number of connections [remote cluster: {}, opened: {}, maximum: {}]",
clusterAlias,
openConnections,
maxNumConnections
);
finished.onResponse(null);
}
}
}
private static TransportAddress resolveAddress(String address) {
return new TransportAddress(parseConfiguredAddress(address));
}
public static class ProxyModeInfo implements RemoteConnectionInfo.ModeInfo {
private final String address;
private final String serverName;
private final int maxSocketConnections;
private final int numSocketsConnected;
public ProxyModeInfo(String address, String serverName, int maxSocketConnections, int numSocketsConnected) {
this.address = address;
this.serverName = serverName;
this.maxSocketConnections = maxSocketConnections;
this.numSocketsConnected = numSocketsConnected;
}
private ProxyModeInfo(StreamInput input) throws IOException {
address = input.readString();
if (input.getVersion().onOrAfter(Version.V_7_7_0)) {
serverName = input.readString();
} else {
serverName = null;
}
maxSocketConnections = input.readVInt();
numSocketsConnected = input.readVInt();
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.field("proxy_address", address);
builder.field("server_name", serverName);
builder.field("num_proxy_sockets_connected", numSocketsConnected);
builder.field("max_proxy_socket_connections", maxSocketConnections);
return builder;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeString(address);
if (out.getVersion().onOrAfter(Version.V_7_7_0)) {
out.writeString(serverName);
}
out.writeVInt(maxSocketConnections);
out.writeVInt(numSocketsConnected);
}
@Override
public boolean isConnected() {
return numSocketsConnected > 0;
}
@Override
public String modeName() {
return "proxy";
}
public String getAddress() {
return address;
}
public String getServerName() {
return serverName;
}
public int getMaxSocketConnections() {
return maxSocketConnections;
}
public int getNumSocketsConnected() {
return numSocketsConnected;
}
@Override
public RemoteConnectionStrategy.ConnectionStrategy modeType() {
return RemoteConnectionStrategy.ConnectionStrategy.PROXY;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ProxyModeInfo otherProxy = (ProxyModeInfo) o;
return maxSocketConnections == otherProxy.maxSocketConnections
&& numSocketsConnected == otherProxy.numSocketsConnected
&& Objects.equals(address, otherProxy.address)
&& Objects.equals(serverName, otherProxy.serverName);
}
@Override
public int hashCode() {
return Objects.hash(address, serverName, maxSocketConnections, numSocketsConnected);
}
}
}