ReplSetUpdatePositionCommand.java example

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/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.mongodb.commands.signatures.internal;

import com.eightkdata.mongowp.OpTime;
import com.eightkdata.mongowp.bson.BsonArray;
import com.eightkdata.mongowp.bson.BsonDocument;
import com.eightkdata.mongowp.bson.BsonObjectId;
import com.eightkdata.mongowp.bson.BsonValue;
import com.eightkdata.mongowp.exceptions.BadValueException;
import com.eightkdata.mongowp.exceptions.NoSuchKeyException;
import com.eightkdata.mongowp.exceptions.TypesMismatchException;
import com.eightkdata.mongowp.fields.ArrayField;
import com.eightkdata.mongowp.fields.DocField;
import com.eightkdata.mongowp.fields.LongField;
import com.eightkdata.mongowp.fields.ObjectIdField;
import com.eightkdata.mongowp.fields.TimestampField;
import com.eightkdata.mongowp.server.api.impl.AbstractNotAliasableCommand;
import com.eightkdata.mongowp.server.api.tools.Empty;
import com.eightkdata.mongowp.utils.BsonArrayBuilder;
import com.eightkdata.mongowp.utils.BsonDocumentBuilder;
import com.eightkdata.mongowp.utils.BsonReaderTool;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.torodb.mongodb.commands.pojos.MemberConfig;
import com.torodb.mongodb.commands.signatures.internal.ReplSetUpdatePositionCommand.ReplSetUpdatePositionArgument;

import java.util.List;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

//TODO: this command is not compatible with MongoDB 3.2.4+
public class ReplSetUpdatePositionCommand
    extends AbstractNotAliasableCommand<ReplSetUpdatePositionArgument, Empty> {

  public static final ReplSetUpdatePositionCommand INSTANCE = new ReplSetUpdatePositionCommand();

  private static final String COMMAND_FIELD_NAME = "replSetUpdatePosition";

  private ReplSetUpdatePositionCommand() {
    super(COMMAND_FIELD_NAME);
  }

  @Override
  public Class<? extends ReplSetUpdatePositionArgument> getArgClass() {
    return ReplSetUpdatePositionArgument.class;
  }

  @Override
  public ReplSetUpdatePositionArgument unmarshallArg(BsonDocument requestDoc)
      throws TypesMismatchException, NoSuchKeyException, BadValueException {
    return ReplSetUpdatePositionArgument.unmarshall(requestDoc);
  }

  @Override
  public BsonDocument marshallArg(ReplSetUpdatePositionArgument request) {
    return request.marshall();
  }

  @Override
  public Class<? extends Empty> getResultClass() {
    return Empty.class;
  }

  @Override
  public BsonDocument marshallResult(Empty reply) {
    return null;
  }

  @Override
  public Empty unmarshallResult(BsonDocument resultDoc) {
    return Empty.getInstance();
  }

  public static class ReplSetUpdatePositionArgument {

    private static final ArrayField UPDATE_ARRAY_FIELD = new ArrayField("optimes");

    private static final ImmutableSet<String> VALID_FIELD_NAMES = ImmutableSet.of(
        COMMAND_FIELD_NAME, UPDATE_ARRAY_FIELD.getFieldName()
    );

    private final ImmutableList<UpdateInfo> updates;

    public ReplSetUpdatePositionArgument(
        @Nonnull List<UpdateInfo> updates) {
      this.updates = ImmutableList.copyOf(updates);
    }

    @Nonnull
    public ImmutableList<UpdateInfo> getUpdates() throws IllegalStateException {
      return updates;
    }

    private static ReplSetUpdatePositionArgument unmarshall(BsonDocument doc) throws
        TypesMismatchException, NoSuchKeyException, BadValueException {
      if (doc.containsKey("handshake")) {
        throw new IllegalArgumentException("A handshake command wrapped "
            + "inside a replSetUpdatePosition has been recived, but it "
            + "has been treated by the replSetUpdatePosition command");
      }
      BsonReaderTool.checkOnlyHasFields("UpdateInfoArgs", doc, VALID_FIELD_NAMES);

      ImmutableList.Builder<UpdateInfo> updateInfo = ImmutableList.builder();
      BsonArray updateArray = BsonReaderTool.getArray(doc, UPDATE_ARRAY_FIELD);
      for (BsonValue<?> element : updateArray) {
        updateInfo.add(new UpdateInfo(element.asDocument()));
      }

      return new ReplSetUpdatePositionArgument(updateInfo.build());
    }

    private BsonDocument marshall() {
      BsonDocumentBuilder updateInfo = new BsonDocumentBuilder();
      BsonArrayBuilder updatesBuilder = new BsonArrayBuilder(updates.size());
      for (UpdateInfo update : updates) {
        updatesBuilder.add(update.marshall());
      }
      updateInfo.append(UPDATE_ARRAY_FIELD, updatesBuilder.build());
      return updateInfo.build();
    }

    public static class UpdateInfo {

      private static final ObjectIdField MEMBER_RID_FIELD = new ObjectIdField("_id");
      private static final DocField MEMBER_CONFIG_FIELD = new DocField("config");
      private static final TimestampField OP_TIME_FIELD = new TimestampField("optime");
      private static final LongField MEMBER_ID_FIELD = new LongField("memberId");
      private static final LongField CONFIG_VERSION_FIELD = new LongField("cfgver");

      private static final ImmutableSet<String> VALID_FIELD_NAMES = ImmutableSet.of(
          MEMBER_RID_FIELD.getFieldName(), MEMBER_CONFIG_FIELD.getFieldName(),
          OP_TIME_FIELD.getFieldName(), MEMBER_ID_FIELD.getFieldName(),
          CONFIG_VERSION_FIELD.getFieldName()
      );

      private final BsonObjectId rid;
      private final OpTime ts;
      private final long cfgVer;
      private final long memberId;
      @Nullable
      private final MemberConfig config;

      public UpdateInfo(BsonObjectId rid, OpTime ts, long cfgVer, long memberId,
          MemberConfig config) {
        this.rid = rid;
        this.ts = ts;
        this.cfgVer = cfgVer;
        this.memberId = memberId;
        this.config = config;
      }

      public UpdateInfo(BsonDocument doc) throws BadValueException, TypesMismatchException,
          NoSuchKeyException {
        BsonReaderTool.checkOnlyHasFields("UpdateInfoArgs", doc, VALID_FIELD_NAMES);

        ts = new OpTime(BsonReaderTool.getTimestamp(doc, OP_TIME_FIELD));
        cfgVer = BsonReaderTool.getLong(doc, CONFIG_VERSION_FIELD, -1);
        rid = BsonReaderTool.getObjectId(doc, MEMBER_RID_FIELD, null);
        memberId = BsonReaderTool.getLong(doc, MEMBER_ID_FIELD, -1);
        BsonDocument configDoc = BsonReaderTool.getDocument(doc, MEMBER_CONFIG_FIELD, null);
        if (configDoc != null) {
          this.config = MemberConfig.fromDocument(configDoc);
        } else {
          this.config = null;
        }
      }

      public BsonObjectId getRid() {
        return rid;
      }

      public OpTime getTs() {
        return ts;
      }

      public long getCfgVer() {
        return cfgVer;
      }

      public long getMemberId() {
        return memberId;
      }

      @Nullable
      public MemberConfig getConfig() {
        return config;
      }

      private BsonDocument marshall() {
        BsonDocumentBuilder updateInfo = new BsonDocumentBuilder();
        updateInfo.append(MEMBER_RID_FIELD, rid);
        updateInfo.append(OP_TIME_FIELD, ts.getTimestamp());
        updateInfo.append(MEMBER_ID_FIELD, memberId);
        updateInfo.append(CONFIG_VERSION_FIELD, cfgVer);
        if (config != null) {
          updateInfo.append(MEMBER_CONFIG_FIELD, config.toBson());
        }
        return updateInfo.build();
      }
    }
  }
}