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SharedXdsClientPoolProvider.java
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SharedXdsClientPoolProvider.java
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/*
* Copyright 2020 The gRPC Authors
*
* 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
*
* 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.
*/
package io.grpc.xds;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.VisibleForTesting;
import io.grpc.ChannelCredentials;
import io.grpc.Context;
import io.grpc.Grpc;
import io.grpc.ManagedChannel;
import io.grpc.internal.ExponentialBackoffPolicy;
import io.grpc.internal.GrpcUtil;
import io.grpc.internal.ObjectPool;
import io.grpc.internal.SharedResourceHolder;
import io.grpc.internal.TimeProvider;
import io.grpc.xds.Bootstrapper.BootstrapInfo;
import io.grpc.xds.Bootstrapper.ServerInfo;
import io.grpc.xds.XdsNameResolverProvider.XdsClientPoolFactory;
import io.grpc.xds.internal.sds.TlsContextManagerImpl;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
import javax.annotation.concurrent.ThreadSafe;
/**
* The global factory for creating a singleton {@link XdsClient} instance to be used by all gRPC
* clients in the process.
*/
@ThreadSafe
final class SharedXdsClientPoolProvider implements XdsClientPoolFactory {
private final Bootstrapper bootstrapper;
private final Object lock = new Object();
private final AtomicReference<Map<String, ?>> bootstrapOverride = new AtomicReference<>();
private volatile ObjectPool<XdsClient> xdsClientPool;
SharedXdsClientPoolProvider() {
this(new BootstrapperImpl());
}
@VisibleForTesting
SharedXdsClientPoolProvider(Bootstrapper bootstrapper) {
this.bootstrapper = checkNotNull(bootstrapper, "bootstrapper");
}
static SharedXdsClientPoolProvider getDefaultProvider() {
return SharedXdsClientPoolProviderHolder.instance;
}
@Override
public void setBootstrapOverride(Map<String, ?> bootstrap) {
bootstrapOverride.set(bootstrap);
}
@Override
@Nullable
public ObjectPool<XdsClient> get() {
return xdsClientPool;
}
@Override
public ObjectPool<XdsClient> getOrCreate() throws XdsInitializationException {
ObjectPool<XdsClient> ref = xdsClientPool;
if (ref == null) {
synchronized (lock) {
ref = xdsClientPool;
if (ref == null) {
BootstrapInfo bootstrapInfo;
Map<String, ?> rawBootstrap = bootstrapOverride.get();
if (rawBootstrap != null) {
bootstrapInfo = bootstrapper.bootstrap(rawBootstrap);
} else {
bootstrapInfo = bootstrapper.bootstrap();
}
if (bootstrapInfo.getServers().isEmpty()) {
throw new XdsInitializationException("No xDS server provided");
}
ref = xdsClientPool = new RefCountedXdsClientObjectPool(bootstrapInfo);
}
}
}
return ref;
}
private static class SharedXdsClientPoolProviderHolder {
private static final SharedXdsClientPoolProvider instance = new SharedXdsClientPoolProvider();
}
@ThreadSafe
@VisibleForTesting
static class RefCountedXdsClientObjectPool implements ObjectPool<XdsClient> {
private final Context context = Context.ROOT;
private final BootstrapInfo bootstrapInfo;
private final Object lock = new Object();
@GuardedBy("lock")
private ScheduledExecutorService scheduler;
@GuardedBy("lock")
private ManagedChannel channel;
@GuardedBy("lock")
private XdsClient xdsClient;
@GuardedBy("lock")
private int refCount;
@VisibleForTesting
RefCountedXdsClientObjectPool(BootstrapInfo bootstrapInfo) {
this.bootstrapInfo = checkNotNull(bootstrapInfo);
}
@Override
public XdsClient getObject() {
synchronized (lock) {
if (refCount == 0) {
ServerInfo serverInfo = bootstrapInfo.getServers().get(0); // use first server
String target = serverInfo.getTarget();
ChannelCredentials channelCredentials = serverInfo.getChannelCredentials();
channel = Grpc.newChannelBuilder(target, channelCredentials)
.keepAliveTime(5, TimeUnit.MINUTES)
.build();
scheduler = SharedResourceHolder.get(GrpcUtil.TIMER_SERVICE);
xdsClient = new ClientXdsClient(channel, bootstrapInfo, context, scheduler,
new ExponentialBackoffPolicy.Provider(), GrpcUtil.STOPWATCH_SUPPLIER,
TimeProvider.SYSTEM_TIME_PROVIDER, new TlsContextManagerImpl(bootstrapInfo));
}
refCount++;
return xdsClient;
}
}
@Override
public XdsClient returnObject(Object object) {
synchronized (lock) {
refCount--;
if (refCount == 0) {
xdsClient.shutdown();
xdsClient = null;
channel.shutdown();
scheduler = SharedResourceHolder.release(GrpcUtil.TIMER_SERVICE, scheduler);
}
return null;
}
}
@VisibleForTesting
@Nullable
ManagedChannel getChannelForTest() {
synchronized (lock) {
return channel;
}
}
@VisibleForTesting
@Nullable
XdsClient getXdsClientForTest() {
synchronized (lock) {
return xdsClient;
}
}
}
}