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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.common.base.Preconditions.checkNotNull;

import com.google.api.gax.rpc.ApiException;
import com.google.auto.value.AutoValue;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.Partition;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.TopicPath;
import com.google.cloud.pubsublite.internal.ExtractStatus;
import com.google.cloud.pubsublite.internal.TopicStatsClient;
import com.google.cloud.pubsublite.internal.TopicStatsClientSettings;
import com.google.common.base.Ticker;
import java.io.Serializable;
import java.util.concurrent.ExecutionException;
import javax.annotation.Nonnull;

@AutoValue
abstract class TopicBacklogReaderSettings implements Serializable {
  private static final long serialVersionUID = -4001752066450248673L;

  /**
   * The topic path for this backlog reader. Either topicPath or subscriptionPath must be set. If
   * both are set, subscriptionPath will be ignored.
   */
  abstract TopicPath topicPath();

  abstract Partition partition();

  static Builder newBuilder() {
    return new AutoValue_TopicBacklogReaderSettings.Builder();
  }

  @AutoValue.Builder
  abstract static class Builder {

    // Required parameters.
    abstract Builder setTopicPath(TopicPath topicPath);

    @SuppressWarnings("assignment.type.incompatible")
    Builder setTopicPathFromSubscriptionPath(SubscriptionPath subscriptionPath)
        throws ApiException {
      try (AdminClient adminClient =
          AdminClient.create(
              AdminClientSettings.newBuilder()
                  .setRegion(subscriptionPath.location().extractRegion())
                  .build())) {
        return setTopicPath(
            TopicPath.parse(adminClient.getSubscription(subscriptionPath).get().getTopic()));
      } catch (ExecutionException e) {
        @Nonnull Throwable cause = checkNotNull(e.getCause());
        throw ExtractStatus.toCanonical(cause).underlying;
      } catch (Throwable t) {
        throw ExtractStatus.toCanonical(t).underlying;
      }
    }

    abstract Builder setPartition(Partition partition);

    abstract TopicBacklogReaderSettings build();
  }

  TopicBacklogReader instantiate() throws ApiException {
    TopicStatsClientSettings settings =
        TopicStatsClientSettings.newBuilder()
            .setRegion(topicPath().location().extractRegion())
            .build();
    TopicBacklogReader impl =
        new TopicBacklogReaderImpl(TopicStatsClient.create(settings), topicPath(), partition());
    return new LimitingTopicBacklogReader(impl, Ticker.systemTicker());
  }
}