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Beam IO for Google Cloud Pub/Sub Lite
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/*
 * Copyright 2020 Google LLC
 *
 * 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 com.google.cloud.pubsublite.beam;

import static com.google.cloud.pubsublite.internal.ExtractStatus.toCanonical;
import static com.google.cloud.pubsublite.internal.UncheckedApiPreconditions.checkArgument;
import static com.google.cloud.pubsublite.internal.wire.ServiceClients.addDefaultMetadata;
import static com.google.cloud.pubsublite.internal.wire.ServiceClients.addDefaultSettings;

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.MessageMetadata;
import com.google.cloud.pubsublite.Partition;
import com.google.cloud.pubsublite.cloudpubsub.PublisherSettings;
import com.google.cloud.pubsublite.internal.Publisher;
import com.google.cloud.pubsublite.internal.wire.PartitionCountWatchingPublisherSettings;
import com.google.cloud.pubsublite.internal.wire.PubsubContext;
import com.google.cloud.pubsublite.internal.wire.PubsubContext.Framework;
import com.google.cloud.pubsublite.internal.wire.RoutingMetadata;
import com.google.cloud.pubsublite.internal.wire.SinglePartitionPublisherBuilder;
import com.google.cloud.pubsublite.v1.AdminServiceClient;
import com.google.cloud.pubsublite.v1.AdminServiceSettings;
import com.google.cloud.pubsublite.v1.PublisherServiceClient;
import com.google.cloud.pubsublite.v1.PublisherServiceSettings;
import com.google.common.reflect.TypeToken;

class Publishers {
  private static final Framework FRAMEWORK = Framework.of("BEAM");

  private Publishers() {}

  private static AdminClient newAdminClient(PublisherOptions options) throws ApiException {
    try {
      return AdminClient.create(
          AdminClientSettings.newBuilder()
              .setServiceClient(
                  AdminServiceClient.create(
                      addDefaultSettings(
                          options.topicPath().location().region(),
                          AdminServiceSettings.newBuilder())))
              .setRegion(options.topicPath().location().region())
              .build());
    } catch (Throwable t) {
      throw toCanonical(t).underlying;
    }
  }

  private static PublisherServiceClient newServiceClient(
      PublisherOptions options, Partition partition) {
    PublisherServiceSettings.Builder settingsBuilder = PublisherServiceSettings.newBuilder();
    settingsBuilder =
        addDefaultMetadata(
            PubsubContext.of(FRAMEWORK),
            RoutingMetadata.of(options.topicPath(), partition),
            settingsBuilder);
    try {
      return PublisherServiceClient.create(
          addDefaultSettings(options.topicPath().location().region(), settingsBuilder));
    } catch (Throwable t) {
      throw toCanonical(t).underlying;
    }
  }

  @SuppressWarnings("unchecked")
  static Publisher newPublisher(PublisherOptions options) throws ApiException {
    SerializableSupplier