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Flo BigQuery support

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/*-
 * -\-\-
 * Flo BigQuery
 * --
 * Copyright (C) 2016 - 2018 Spotify AB
 * --
 * 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.spotify.flo.contrib.bigquery;

import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryOptions;
import com.spotify.flo.FloTesting;

class BigQueryClientSingleton {

  private static class Holder {

    private static final BigQuery BIGQUERY_INTERNAL;
    private static final FloBigQueryClient BIGQUERY_CLIENT;

    static {
      final BigQueryOptions.Builder bigquery = BigQueryOptions.newBuilder();
      // Work around a bug in ServiceOptions.getDefaultProjectId() where it will use the project
      // returned by the GCE metadata server instead of the service account project
      // https://github.com/GoogleCloudPlatform/google-cloud-java/pull/2304/files#diff-966eb51fcb59c92eb46ebd5f532d8e52R404
      // https://github.com/GoogleCloudPlatform/google-cloud-java/issues/3533
      final String projectId = GcpOptions.getDefaultProjectId();
      if (projectId != null) {
        bigquery.setProjectId(projectId);
      }
      BIGQUERY_INTERNAL = bigquery.build().getService();
      BIGQUERY_CLIENT = new DefaultBigQueryClient(BIGQUERY_INTERNAL);
    }
  }

  static FloBigQueryClient bq() {
    if (FloTesting.isTest()) {
      return BigQueryMocking.mock().client();
    } else {
      return Holder.BIGQUERY_CLIENT;
    }
  }
}