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gRPC: Netty

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/*
 * Copyright 2022 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.netty;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.base.Preconditions;
import io.grpc.EquivalentAddressGroup;
import io.grpc.NameResolver;
import io.netty.channel.unix.DomainSocketAddress;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

final class UdsNameResolver extends NameResolver {
  private NameResolver.Listener2 listener;
  private final String authority;

  UdsNameResolver(String authority, String targetPath) {
    checkArgument(authority == null, "non-null authority not supported");
    this.authority = targetPath;
  }

  @Override
  public String getServiceAuthority() {
    return this.authority;
  }

  @Override
  public void start(Listener2 listener) {
    Preconditions.checkState(this.listener == null, "already started");
    this.listener = checkNotNull(listener, "listener");
    resolve();
  }

  @Override
  public void refresh() {
    resolve();
  }

  private void resolve() {
    ResolutionResult.Builder resolutionResultBuilder = ResolutionResult.newBuilder();
    List servers = new ArrayList<>(1);
    servers.add(new EquivalentAddressGroup(new DomainSocketAddress(authority)));
    resolutionResultBuilder.setAddresses(Collections.unmodifiableList(servers));
    listener.onResult(resolutionResultBuilder.build());
  }

  @Override
  public void shutdown() {}
}