io.grpc.alts.HandshakerServiceChannel Maven / Gradle / Ivy
/*
* Copyright 2018, 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.alts;
import com.google.common.base.Preconditions;
import io.grpc.ManagedChannel;
import io.grpc.netty.NettyChannelBuilder;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.util.concurrent.DefaultThreadFactory;
import java.util.concurrent.ThreadFactory;
/**
* Class for creating a single shared grpc channel to the ALTS Handshaker Service. The channel to
* the handshaker service is local and is over plaintext. Each application will have at most one
* connection to the handshaker service.
*
* TODO: Release the channel if it is not used.
*/
final class HandshakerServiceChannel {
// Default handshaker service address.
private static String handshakerAddress = "metadata.google.internal:8080";
// Shared channel to ALTS handshaker service.
private static ManagedChannel channel = null;
// Construct me not!
private HandshakerServiceChannel() {}
// Sets handshaker service address for testing and creates the channel to the handshaker service.
public static synchronized void setHandshakerAddressForTesting(String handshakerAddress) {
Preconditions.checkState(
channel == null || HandshakerServiceChannel.handshakerAddress.equals(handshakerAddress),
"HandshakerServiceChannel already created with a different handshakerAddress");
HandshakerServiceChannel.handshakerAddress = handshakerAddress;
if (channel == null) {
channel = createChannel();
}
}
/** Create a new channel to ALTS handshaker service, if it has not been created yet. */
private static ManagedChannel createChannel() {
/* Use its own event loop thread pool to avoid blocking. */
ThreadFactory clientThreadFactory = new DefaultThreadFactory("handshaker pool", true);
ManagedChannel channel =
NettyChannelBuilder.forTarget(handshakerAddress)
.directExecutor()
.eventLoopGroup(new NioEventLoopGroup(1, clientThreadFactory))
.usePlaintext()
.build();
return channel;
}
public static synchronized ManagedChannel get() {
if (channel == null) {
channel = createChannel();
}
return channel;
}
}