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/*
* Copyright 2014, gRPC Authors 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
*
* 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.internal;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.MoreExecutors;
import io.grpc.Attributes;
import io.grpc.ClientInterceptor;
import io.grpc.CompressorRegistry;
import io.grpc.DecompressorRegistry;
import io.grpc.EquivalentAddressGroup;
import io.grpc.LoadBalancer;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.NameResolver;
import io.grpc.NameResolverProvider;
import io.grpc.PickFirstBalancerFactory;
import io.opencensus.trace.Tracing;
import java.net.SocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
/**
* The base class for channel builders.
*
* @param The concrete type of this builder.
*/
public abstract class AbstractManagedChannelImplBuilder
> extends ManagedChannelBuilder {
private static final String DIRECT_ADDRESS_SCHEME = "directaddress";
public static ManagedChannelBuilder forAddress(String name, int port) {
throw new UnsupportedOperationException("Subclass failed to hide static factory");
}
public static ManagedChannelBuilder forTarget(String target) {
throw new UnsupportedOperationException("Subclass failed to hide static factory");
}
/**
* An idle timeout larger than this would disable idle mode.
*/
@VisibleForTesting
static final long IDLE_MODE_MAX_TIMEOUT_DAYS = 30;
/**
* The default idle timeout.
*/
@VisibleForTesting
static final long IDLE_MODE_DEFAULT_TIMEOUT_MILLIS = TimeUnit.MINUTES.toMillis(30);
/**
* An idle timeout smaller than this would be capped to it.
*/
@VisibleForTesting
static final long IDLE_MODE_MIN_TIMEOUT_MILLIS = TimeUnit.SECONDS.toMillis(1);
private static final ObjectPool DEFAULT_EXECUTOR_POOL =
SharedResourcePool.forResource(GrpcUtil.SHARED_CHANNEL_EXECUTOR);
private static final NameResolver.Factory DEFAULT_NAME_RESOLVER_FACTORY =
NameResolverProvider.asFactory();
private static final LoadBalancer.Factory DEFAULT_LOAD_BALANCER_FACTORY =
PickFirstBalancerFactory.getInstance();
private static final DecompressorRegistry DEFAULT_DECOMPRESSOR_REGISTRY =
DecompressorRegistry.getDefaultInstance();
private static final CompressorRegistry DEFAULT_COMPRESSOR_REGISTRY =
CompressorRegistry.getDefaultInstance();
ObjectPool executorPool = DEFAULT_EXECUTOR_POOL;
private final List interceptors = new ArrayList();
// Access via getter, which may perform authority override as needed
private NameResolver.Factory nameResolverFactory = DEFAULT_NAME_RESOLVER_FACTORY;
final String target;
@Nullable
private final SocketAddress directServerAddress;
@Nullable
String userAgent;
@VisibleForTesting
@Nullable
String authorityOverride;
LoadBalancer.Factory loadBalancerFactory = DEFAULT_LOAD_BALANCER_FACTORY;
boolean fullStreamDecompression;
DecompressorRegistry decompressorRegistry = DEFAULT_DECOMPRESSOR_REGISTRY;
CompressorRegistry compressorRegistry = DEFAULT_COMPRESSOR_REGISTRY;
long idleTimeoutMillis = IDLE_MODE_DEFAULT_TIMEOUT_MILLIS;
private int maxInboundMessageSize = GrpcUtil.DEFAULT_MAX_MESSAGE_SIZE;
/**
* Sets the maximum message size allowed for a single gRPC frame. If an inbound messages
* larger than this limit is received it will not be processed and the RPC will fail with
* RESOURCE_EXHAUSTED.
*/
// Can be overridden by subclasses.
@Override
public T maxInboundMessageSize(int max) {
checkArgument(max >= 0, "negative max");
maxInboundMessageSize = max;
return thisT();
}
protected final int maxInboundMessageSize() {
return maxInboundMessageSize;
}
private boolean statsEnabled = true;
private boolean recordStats = true;
private boolean tracingEnabled = true;
@Nullable
private CensusStatsModule censusStatsOverride;
protected AbstractManagedChannelImplBuilder(String target) {
this.target = Preconditions.checkNotNull(target, "target");
this.directServerAddress = null;
}
/**
* Returns a target string for the SocketAddress. It is only used as a placeholder, because
* DirectAddressNameResolverFactory will not actually try to use it. However, it must be a valid
* URI.
*/
@VisibleForTesting
static String makeTargetStringForDirectAddress(SocketAddress address) {
try {
return new URI(DIRECT_ADDRESS_SCHEME, "", "/" + address, null).toString();
} catch (URISyntaxException e) {
// It should not happen.
throw new RuntimeException(e);
}
}
protected AbstractManagedChannelImplBuilder(SocketAddress directServerAddress, String authority) {
this.target = makeTargetStringForDirectAddress(directServerAddress);
this.directServerAddress = directServerAddress;
this.nameResolverFactory = new DirectAddressNameResolverFactory(directServerAddress, authority);
}
@Override
public final T directExecutor() {
return executor(MoreExecutors.directExecutor());
}
@Override
public final T executor(Executor executor) {
if (executor != null) {
this.executorPool = new FixedObjectPool(executor);
} else {
this.executorPool = DEFAULT_EXECUTOR_POOL;
}
return thisT();
}
@Override
public final T intercept(List interceptors) {
this.interceptors.addAll(interceptors);
return thisT();
}
@Override
public final T intercept(ClientInterceptor... interceptors) {
return intercept(Arrays.asList(interceptors));
}
@Override
public final T nameResolverFactory(NameResolver.Factory resolverFactory) {
Preconditions.checkState(directServerAddress == null,
"directServerAddress is set (%s), which forbids the use of NameResolverFactory",
directServerAddress);
if (resolverFactory != null) {
this.nameResolverFactory = resolverFactory;
} else {
this.nameResolverFactory = DEFAULT_NAME_RESOLVER_FACTORY;
}
return thisT();
}
@Override
public final T loadBalancerFactory(LoadBalancer.Factory loadBalancerFactory) {
Preconditions.checkState(directServerAddress == null,
"directServerAddress is set (%s), which forbids the use of LoadBalancer.Factory",
directServerAddress);
if (loadBalancerFactory != null) {
this.loadBalancerFactory = loadBalancerFactory;
} else {
this.loadBalancerFactory = DEFAULT_LOAD_BALANCER_FACTORY;
}
return thisT();
}
@Override
public final T enableFullStreamDecompression() {
this.fullStreamDecompression = true;
return thisT();
}
@Override
public final T decompressorRegistry(DecompressorRegistry registry) {
if (registry != null) {
this.decompressorRegistry = registry;
} else {
this.decompressorRegistry = DEFAULT_DECOMPRESSOR_REGISTRY;
}
return thisT();
}
@Override
public final T compressorRegistry(CompressorRegistry registry) {
if (registry != null) {
this.compressorRegistry = registry;
} else {
this.compressorRegistry = DEFAULT_COMPRESSOR_REGISTRY;
}
return thisT();
}
@Override
public final T userAgent(@Nullable String userAgent) {
this.userAgent = userAgent;
return thisT();
}
@Override
public final T overrideAuthority(String authority) {
this.authorityOverride = checkAuthority(authority);
return thisT();
}
@Override
public final T idleTimeout(long value, TimeUnit unit) {
checkArgument(value > 0, "idle timeout is %s, but must be positive", value);
// We convert to the largest unit to avoid overflow
if (unit.toDays(value) >= IDLE_MODE_MAX_TIMEOUT_DAYS) {
// This disables idle mode
this.idleTimeoutMillis = ManagedChannelImpl.IDLE_TIMEOUT_MILLIS_DISABLE;
} else {
this.idleTimeoutMillis = Math.max(unit.toMillis(value), IDLE_MODE_MIN_TIMEOUT_MILLIS);
}
return thisT();
}
/**
* Override the default stats implementation.
*/
@VisibleForTesting
protected final T overrideCensusStatsModule(CensusStatsModule censusStats) {
this.censusStatsOverride = censusStats;
return thisT();
}
/**
* Disable or enable stats features. Enabled by default.
*/
protected void setStatsEnabled(boolean value) {
statsEnabled = value;
}
/**
* Disable or enable stats recording. Effective only if {@link #setStatsEnabled} is set to true.
* Enabled by default.
*/
protected void setRecordStats(boolean value) {
recordStats = value;
}
/**
* Disable or enable tracing features. Enabled by default.
*/
protected void setTracingEnabled(boolean value) {
tracingEnabled = value;
}
@VisibleForTesting
final long getIdleTimeoutMillis() {
return idleTimeoutMillis;
}
/**
* Verifies the authority is valid. This method exists as an escape hatch for putting in an
* authority that is valid, but would fail the default validation provided by this
* implementation.
*/
protected String checkAuthority(String authority) {
return GrpcUtil.checkAuthority(authority);
}
@Override
public ManagedChannel build() {
return new ManagedChannelImpl(
this,
buildTransportFactory(),
// TODO(carl-mastrangelo): Allow clients to pass this in
new ExponentialBackoffPolicy.Provider(),
SharedResourcePool.forResource(GrpcUtil.SHARED_CHANNEL_EXECUTOR),
GrpcUtil.STOPWATCH_SUPPLIER,
getEffectiveInterceptors(),
GrpcUtil.getProxyDetector());
}
@VisibleForTesting
final List getEffectiveInterceptors() {
List effectiveInterceptors =
new ArrayList(this.interceptors);
if (statsEnabled) {
CensusStatsModule censusStats = this.censusStatsOverride;
if (censusStats == null) {
censusStats = new CensusStatsModule(GrpcUtil.STOPWATCH_SUPPLIER, true);
}
// First interceptor runs last (see ClientInterceptors.intercept()), so that no
// other interceptor can override the tracer factory we set in CallOptions.
effectiveInterceptors.add(0, censusStats.getClientInterceptor(recordStats));
}
if (tracingEnabled) {
CensusTracingModule censusTracing =
new CensusTracingModule(Tracing.getTracer(),
Tracing.getPropagationComponent().getBinaryFormat());
effectiveInterceptors.add(0, censusTracing.getClientInterceptor());
}
return effectiveInterceptors;
}
/**
* Subclasses should override this method to provide the {@link ClientTransportFactory}
* appropriate for this channel. This method is meant for Transport implementors and should not
* be used by normal users.
*/
protected abstract ClientTransportFactory buildTransportFactory();
/**
* Subclasses can override this method to provide additional parameters to {@link
* NameResolver.Factory#newNameResolver}. The default implementation returns {@link
* Attributes#EMPTY}.
*/
protected Attributes getNameResolverParams() {
return Attributes.EMPTY;
}
/**
* Returns a {@link NameResolver.Factory} for the channel.
*/
NameResolver.Factory getNameResolverFactory() {
if (authorityOverride == null) {
return nameResolverFactory;
} else {
return new OverrideAuthorityNameResolverFactory(nameResolverFactory, authorityOverride);
}
}
private static class DirectAddressNameResolverFactory extends NameResolver.Factory {
final SocketAddress address;
final String authority;
DirectAddressNameResolverFactory(SocketAddress address, String authority) {
this.address = address;
this.authority = authority;
}
@Override
public NameResolver newNameResolver(URI notUsedUri, Attributes params) {
return new NameResolver() {
@Override
public String getServiceAuthority() {
return authority;
}
@Override
public void start(final Listener listener) {
listener.onAddresses(
Collections.singletonList(new EquivalentAddressGroup(address)),
Attributes.EMPTY);
}
@Override
public void shutdown() {}
};
}
@Override
public String getDefaultScheme() {
return DIRECT_ADDRESS_SCHEME;
}
}
/**
* Returns the correctly typed version of the builder.
*/
private T thisT() {
@SuppressWarnings("unchecked")
T thisT = (T) this;
return thisT;
}
}
