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HandshakerServiceChannel.java
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HandshakerServiceChannel.java
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/*
* Copyright 2018 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.alts;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ManagedChannel;
import io.grpc.MethodDescriptor;
import io.grpc.internal.SharedResourceHolder.Resource;
import io.grpc.netty.NettyChannelBuilder;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.util.concurrent.DefaultThreadFactory;
import java.util.concurrent.TimeUnit;
/**
* Class for creating a single shared gRPC channel to the ALTS Handshaker Service using
* SharedResourceHolder. The channel to the handshaker service is local and is over plaintext. Each
* application will have at most one connection to the handshaker service.
*/
final class HandshakerServiceChannel {
static final Resource<Channel> SHARED_HANDSHAKER_CHANNEL =
new ChannelResource("metadata.google.internal.:8080");
/** Returns a resource of handshaker service channel for testing only. */
static Resource<Channel> getHandshakerChannelForTesting(String handshakerAddress) {
return new ChannelResource(handshakerAddress);
}
private static class ChannelResource implements Resource<Channel> {
private final String target;
public ChannelResource(String target) {
this.target = target;
}
@Override
public Channel create() {
/* Use its own event loop thread pool to avoid blocking. */
EventLoopGroup eventGroup =
new NioEventLoopGroup(1, new DefaultThreadFactory("handshaker pool", true));
ManagedChannel channel = NettyChannelBuilder.forTarget(target)
.channelType(NioSocketChannel.class)
.directExecutor()
.eventLoopGroup(eventGroup)
.usePlaintext()
.build();
return new EventLoopHoldingChannel(channel, eventGroup);
}
@Override
public void close(Channel instanceChannel) {
((EventLoopHoldingChannel) instanceChannel).close();
}
@Override
public String toString() {
return "grpc-alts-handshaker-service-channel";
}
}
private abstract static class ForwardingChannel extends Channel {
protected abstract Channel delegate();
@Override
public String authority() {
return delegate().authority();
}
@Override
public <ReqT, RespT> ClientCall<ReqT, RespT> newCall(
MethodDescriptor<ReqT, RespT> methodDescriptor, CallOptions options) {
return delegate().newCall(methodDescriptor, options);
}
}
private static class EventLoopHoldingChannel extends ForwardingChannel {
private final ManagedChannel delegate;
private final EventLoopGroup eventLoopGroup;
public EventLoopHoldingChannel(ManagedChannel delegate, EventLoopGroup eventLoopGroup) {
this.delegate = delegate;
this.eventLoopGroup = eventLoopGroup;
}
@Override
protected Channel delegate() {
return delegate;
}
@SuppressWarnings("FutureReturnValueIgnored") // netty ChannelFuture
public void close() {
// This method will generally be run on the ResourceHolder's ScheduledExecutorService thread
delegate.shutdownNow();
boolean terminated = false;
try {
terminated = delegate.awaitTermination(2, TimeUnit.SECONDS);
} catch (InterruptedException ex) {
// terminated will be false
}
// Try hard to shutdown abruptly so any bug is more likely to be noticed during testing.
long quietPeriodSeconds = terminated ? 0 : 1;
eventLoopGroup.shutdownGracefully(quietPeriodSeconds, 10, TimeUnit.SECONDS);
}
}
}