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GoogleCloudToProdNameResolver.java
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GoogleCloudToProdNameResolver.java
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/*
* Copyright 2021 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 com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.CharStreams;
import io.grpc.NameResolver;
import io.grpc.NameResolverRegistry;
import io.grpc.Status;
import io.grpc.SynchronizationContext;
import io.grpc.alts.InternalCheckGcpEnvironment;
import io.grpc.internal.GrpcUtil;
import io.grpc.internal.SharedResourceHolder;
import io.grpc.internal.SharedResourceHolder.Resource;
import io.grpc.xds.XdsNameResolverProvider.XdsClientPoolFactory;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.concurrent.Executor;
/**
* CloudToProd version of {@link NameResolver}.
*/
final class GoogleCloudToProdNameResolver extends NameResolver {
@VisibleForTesting
static final String METADATA_URL_ZONE =
"http://metadata.google.internal/computeMetadata/v1/instance/zone";
@VisibleForTesting
static final String METADATA_URL_SUPPORT_IPV6 =
"http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/ipv6s";
@VisibleForTesting
static boolean isOnGcp = InternalCheckGcpEnvironment.isOnGcp();
@VisibleForTesting
static boolean xdsBootstrapProvided =
System.getenv("GRPC_XDS_BOOTSTRAP") != null
|| System.getProperty("io.grpc.xds.bootstrap") != null
|| System.getenv("GRPC_XDS_BOOTSTRAP_CONFIG") != null
|| System.getProperty("io.grpc.xds.bootstrapConfig") != null;
private HttpConnectionProvider httpConnectionProvider = HttpConnectionFactory.INSTANCE;
private final String authority;
private final SynchronizationContext syncContext;
private final Resource<Executor> executorResource;
private final XdsClientPoolFactory xdsClientPoolFactory;
private final NameResolver delegate;
private final boolean usingExecutorResource;
// It's not possible to use both PSM and DirectPath C2P in the same application.
// Delegate to DNS if user-provided bootstrap is found.
private final String schemeOverride = !isOnGcp || xdsBootstrapProvided ? "dns" : "xds";
private Executor executor;
private Listener2 listener;
private boolean succeeded;
private boolean resolving;
private boolean shutdown;
GoogleCloudToProdNameResolver(URI targetUri, Args args, Resource<Executor> executorResource,
XdsClientPoolFactory xdsClientPoolFactory) {
this(targetUri, args, executorResource, xdsClientPoolFactory,
NameResolverRegistry.getDefaultRegistry().asFactory());
}
@VisibleForTesting
GoogleCloudToProdNameResolver(URI targetUri, Args args, Resource<Executor> executorResource,
XdsClientPoolFactory xdsClientPoolFactory, NameResolver.Factory nameResolverFactory) {
this.executorResource = checkNotNull(executorResource, "executorResource");
this.xdsClientPoolFactory = checkNotNull(xdsClientPoolFactory, "xdsClientPoolFactory");
String targetPath = checkNotNull(checkNotNull(targetUri, "targetUri").getPath(), "targetPath");
Preconditions.checkArgument(
targetPath.startsWith("/"),
"the path component (%s) of the target (%s) must start with '/'",
targetPath,
targetUri);
authority = GrpcUtil.checkAuthority(targetPath.substring(1));
syncContext = checkNotNull(args, "args").getSynchronizationContext();
delegate = checkNotNull(nameResolverFactory, "nameResolverFactory").newNameResolver(
overrideUriScheme(targetUri, schemeOverride), args);
executor = args.getOffloadExecutor();
usingExecutorResource = executor == null;
}
@Override
public String getServiceAuthority() {
return authority;
}
@Override
public void start(final Listener2 listener) {
if (delegate == null) {
listener.onError(Status.INTERNAL.withDescription(
"Delegate resolver not found, scheme: " + schemeOverride));
return;
}
this.listener = checkNotNull(listener, "listener");
resolve();
}
private void resolve() {
if (resolving || shutdown || delegate == null) {
return;
}
resolving = true;
if (schemeOverride.equals("dns")) {
delegate.start(listener);
succeeded = true;
resolving = false;
return;
}
if (executor == null) {
executor = SharedResourceHolder.get(executorResource);
}
class Resolve implements Runnable {
@Override
public void run() {
String zone;
boolean supportIpv6;
ImmutableMap<String, ?> rawBootstrap = null;
try {
zone = queryZoneMetadata(METADATA_URL_ZONE);
supportIpv6 = queryIpv6SupportMetadata(METADATA_URL_SUPPORT_IPV6);
rawBootstrap = generateBootstrap(zone, supportIpv6);
} catch (IOException e) {
listener.onError(Status.INTERNAL.withDescription("Unable to get metadata").withCause(e));
} finally {
final ImmutableMap<String, ?> finalRawBootstrap = rawBootstrap;
syncContext.execute(new Runnable() {
@Override
public void run() {
if (!shutdown && finalRawBootstrap != null) {
xdsClientPoolFactory.setBootstrapOverride(finalRawBootstrap);
delegate.start(listener);
succeeded = true;
}
resolving = false;
}
});
}
}
}
executor.execute(new Resolve());
}
private static ImmutableMap<String, ?> generateBootstrap(String zone, boolean supportIpv6) {
ImmutableMap.Builder<String, Object> nodeBuilder = ImmutableMap.builder();
nodeBuilder.put("id", "C2P");
if (!zone.isEmpty()) {
nodeBuilder.put("locality", ImmutableMap.of("zone", zone));
}
if (supportIpv6) {
nodeBuilder.put("metadata",
ImmutableMap.of("TRAFFICDIRECTOR_DIRECTPATH_C2P_IPV6_CAPABLE", true));
}
ImmutableMap.Builder<String, Object> serverBuilder = ImmutableMap.builder();
serverBuilder.put("server_uri", "directpath-trafficdirector.googleapis.com");
serverBuilder.put("channel_creds",
ImmutableList.of(ImmutableMap.of("type", "google_default")));
return ImmutableMap.of(
"node", nodeBuilder.build(),
"xds_servers", ImmutableList.of(serverBuilder.build()));
}
@Override
public void refresh() {
if (succeeded) {
delegate.refresh();
} else if (!resolving) {
resolve();
}
}
@Override
public void shutdown() {
if (shutdown) {
return;
}
shutdown = true;
if (delegate != null) {
delegate.shutdown();
}
if (executor != null && usingExecutorResource) {
executor = SharedResourceHolder.release(executorResource, executor);
}
}
private String queryZoneMetadata(String url) throws IOException {
HttpURLConnection con = null;
String respBody;
try {
con = httpConnectionProvider.createConnection(url);
if (con.getResponseCode() != 200) {
return "";
}
try (Reader reader = new InputStreamReader(con.getInputStream(), Charsets.UTF_8)) {
respBody = CharStreams.toString(reader);
}
} finally {
if (con != null) {
con.disconnect();
}
}
int index = respBody.lastIndexOf('/');
return index == -1 ? "" : respBody.substring(index + 1);
}
private boolean queryIpv6SupportMetadata(String url) throws IOException {
HttpURLConnection con = null;
try {
con = httpConnectionProvider.createConnection(url);
return con.getResponseCode() == 200;
} finally {
if (con != null) {
con.disconnect();
}
}
}
@VisibleForTesting
void setHttpConnectionProvider(HttpConnectionProvider httpConnectionProvider) {
this.httpConnectionProvider = httpConnectionProvider;
}
private static URI overrideUriScheme(URI uri, String scheme) {
URI res;
try {
res = new URI(scheme, uri.getAuthority(), uri.getPath(), uri.getQuery(), uri.getFragment());
} catch (URISyntaxException ex) {
throw new IllegalArgumentException("Invalid scheme: " + scheme, ex);
}
return res;
}
private enum HttpConnectionFactory implements HttpConnectionProvider {
INSTANCE;
@Override
public HttpURLConnection createConnection(String url) throws IOException {
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod("GET");
con.setReadTimeout(10000);
con.setRequestProperty("Metadata-Flavor", "Google");
return con;
}
}
@VisibleForTesting
interface HttpConnectionProvider {
HttpURLConnection createConnection(String url) throws IOException;
}
}