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XdsNameResolverProvider.java
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XdsNameResolverProvider.java
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/*
* Copyright 2019 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.base.Preconditions;
import io.grpc.Internal;
import io.grpc.NameResolver.Args;
import io.grpc.NameResolverProvider;
import io.grpc.internal.ObjectPool;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.URI;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import javax.annotation.Nullable;
/**
* A provider for {@link XdsNameResolver}.
*
* <p>It resolves a target URI whose scheme is {@code "xds"}. The authority of the
* target URI is never used for current release. The path of the target URI, excluding the leading
* slash {@code '/'}, will indicate the name to use in the VHDS query.
*
* <p>This class should not be directly referenced in code. The resolver should be accessed
* through {@link io.grpc.NameResolverRegistry} with the URI scheme "xds".
*/
@Internal
public final class XdsNameResolverProvider extends NameResolverProvider {
private static final String SCHEME = "xds";
private final String scheme;
private final Map<String, ?> bootstrapOverride;
public XdsNameResolverProvider() {
this(SCHEME, null);
}
private XdsNameResolverProvider(String scheme,
@Nullable Map<String, ?> bootstrapOverride) {
this.scheme = checkNotNull(scheme, "scheme");
this.bootstrapOverride = bootstrapOverride;
}
/**
* A convenient method to allow creating a {@link XdsNameResolverProvider} with custom scheme
* and bootstrap.
*/
public static XdsNameResolverProvider createForTest(String scheme,
@Nullable Map<String, ?> bootstrapOverride) {
return new XdsNameResolverProvider(scheme, bootstrapOverride);
}
@Override
public XdsNameResolver newNameResolver(URI targetUri, Args args) {
if (scheme.equals(targetUri.getScheme())) {
String targetPath = checkNotNull(targetUri.getPath(), "targetPath");
Preconditions.checkArgument(
targetPath.startsWith("/"),
"the path component (%s) of the target (%s) must start with '/'",
targetPath,
targetUri);
String name = targetPath.substring(1);
return new XdsNameResolver(
targetUri.getAuthority(), name, args.getOverrideAuthority(),
args.getServiceConfigParser(), args.getSynchronizationContext(),
args.getScheduledExecutorService(),
bootstrapOverride);
}
return null;
}
@Override
public String getDefaultScheme() {
return scheme;
}
@Override
protected boolean isAvailable() {
return true;
}
@Override
protected int priority() {
// Set priority value to be < 5 as we still want DNS resolver to be the primary default
// resolver.
return 4;
}
@Override
protected Collection<Class<? extends SocketAddress>> getProducedSocketAddressTypes() {
return Collections.singleton(InetSocketAddress.class);
}
interface XdsClientPoolFactory {
void setBootstrapOverride(Map<String, ?> bootstrap);
@Nullable
ObjectPool<XdsClient> get();
ObjectPool<XdsClient> getOrCreate() throws XdsInitializationException;
}
/**
* Provides the counter for aggregating outstanding requests per cluster:eds_service_name.
*/
interface CallCounterProvider {
AtomicLong getOrCreate(String cluster, @Nullable String edsServiceName);
}
}