google-nomulus/java/com/google/domain/registry/rde/PendingDepositChecker.java

// Copyright 2016 Google Inc. 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 com.google.domain.registry.rde;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.domain.registry.model.ofy.ObjectifyService.ofy;
import static com.google.domain.registry.util.DateTimeUtils.isBeforeOrAt;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.domain.registry.config.ConfigModule.Config;
import com.google.domain.registry.model.rde.RdeMode;
import com.google.domain.registry.model.registry.Registries;
import com.google.domain.registry.model.registry.Registry;
import com.google.domain.registry.model.registry.Registry.TldType;
import com.google.domain.registry.model.registry.RegistryCursor;
import com.google.domain.registry.model.registry.RegistryCursor.CursorType;
import com.google.domain.registry.util.Clock;

import com.googlecode.objectify.Work;

import org.joda.time.DateTime;
import org.joda.time.Duration;

import javax.inject.Inject;

/**
 * Utility class that determines which RDE or BRDA deposits need to be created.
 *
 * <p>This class is called by {@link RdeStagingAction} at the beginning of its execution. Since it
 * stages everything in a single run, it needs to know what's awaiting deposit.
 *
 * <p>We start off by getting the list of TLDs with escrow enabled. We then check {@code cursor}
 * to see when it when it was due for a deposit. If that's in the past, then we know that we need
 * to generate a deposit. If it's really far in the past, we might have to generate multiple
 * deposits for that TLD, based on the configured interval.
 *
 * <p><i>However</i> we will only generate one interval forward per mapreduce, since the reduce
 * phase rolls forward a TLD's cursor, and we can't have that happening in parallel.
 *
 * <p>If no deposits have been made so far, then {@code startingPoint} is used as the watermark
 * of the next deposit. If that's a day in the future, then escrow won't start until that date.
 * This first deposit time will be set to datastore in a transaction.
 */
public final class PendingDepositChecker {

  @Inject Clock clock;
  @Inject @Config("brdaDayOfWeek") int brdaDayOfWeek;
  @Inject @Config("brdaInterval") Duration brdaInterval;
  @Inject @Config("rdeInterval") Duration rdeInterval;
  @Inject PendingDepositChecker() {}

  /** Returns multimap of TLDs to all RDE and BRDA deposits that need to happen. */
  public ImmutableSetMultimap<String, PendingDeposit>
      getTldsAndWatermarksPendingDepositForRdeAndBrda() {
    return new ImmutableSetMultimap.Builder<String, PendingDeposit>()
        .putAll(
            getTldsAndWatermarksPendingDeposit(
                RdeMode.FULL,
                CursorType.RDE_STAGING,
                rdeInterval,
                clock.nowUtc().withTimeAtStartOfDay()))
        .putAll(
            getTldsAndWatermarksPendingDeposit(
                RdeMode.THIN,
                CursorType.BRDA,
                brdaInterval,
                advanceToDayOfWeek(clock.nowUtc().withTimeAtStartOfDay(), brdaDayOfWeek)))
        .build();
  }

  private ImmutableSetMultimap<String, PendingDeposit> getTldsAndWatermarksPendingDeposit(
      RdeMode mode, CursorType cursor, Duration interval, DateTime startingPoint) {
    checkArgument(interval.isLongerThan(Duration.ZERO));
    ImmutableSetMultimap.Builder<String, PendingDeposit> builder =
        new ImmutableSetMultimap.Builder<>();
    DateTime now = clock.nowUtc();
    for (String tld : Registries.getTldsOfType(TldType.REAL)) {
      Registry registry = Registry.get(tld);
      if (!registry.getEscrowEnabled()) {
        continue;
      }
      // Avoid creating a transaction unless absolutely necessary.
      Optional<DateTime> cursorValue = RegistryCursor.load(registry, cursor);
      if (isBeforeOrAt(cursorValue.or(startingPoint), now)) {
        DateTime watermark;
        if (cursorValue.isPresent()) {
          watermark = cursorValue.get();
        } else {
          watermark = transactionallyInitializeCursor(registry, cursor, startingPoint);
        }
        if (isBeforeOrAt(watermark, now)) {
          builder.put(tld, PendingDeposit.create(tld, watermark, mode, cursor, interval));
        }
      }
    }
    return builder.build();
  }

  private DateTime transactionallyInitializeCursor(
      final Registry registry,
      final CursorType cursor,
      final DateTime initialValue) {
    return ofy().transact(new Work<DateTime>() {
      @Override
      public DateTime run() {
        for (DateTime value : RegistryCursor.load(registry, cursor).asSet()) {
          return value;
        }
        RegistryCursor.save(registry, cursor, initialValue);
        return initialValue;
      }});
  }

  private static DateTime advanceToDayOfWeek(DateTime date, int dayOfWeek) {
    while (date.getDayOfWeek() != dayOfWeek) {
      date = date.plusDays(1);
    }
    return date;
  }
}