geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/command/RegisterInterest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.
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package org.apache.geode.internal.cache.tier.sockets.command;

import java.io.IOException;

import org.apache.geode.annotations.Immutable;
import org.apache.geode.cache.DynamicRegionFactory;
import org.apache.geode.cache.InterestResultPolicy;
import org.apache.geode.cache.operations.RegisterInterestOperationContext;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.tier.Command;
import org.apache.geode.internal.cache.tier.InterestType;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.BaseCommand;
import org.apache.geode.internal.cache.tier.sockets.CacheClientProxy;
import org.apache.geode.internal.cache.tier.sockets.ChunkedMessage;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.internal.cache.tier.sockets.ServerConnection;
import org.apache.geode.internal.security.AuthorizeRequest;
import org.apache.geode.internal.security.SecurityService;
import org.apache.geode.security.ResourcePermission.Operation;
import org.apache.geode.security.ResourcePermission.Resource;

public class RegisterInterest extends BaseCommand {

  @Immutable
  private static final RegisterInterest singleton = new RegisterInterest();

  public static Command getCommand() {
    return singleton;
  }

  @Override
  public void cmdExecute(Message clientMessage, ServerConnection serverConnection,
      SecurityService securityService, long start) throws IOException, InterruptedException {
    Part regionNamePart, keyPart;
    String regionName;
    Object key;
    serverConnection.setAsTrue(REQUIRES_RESPONSE);
    serverConnection.setAsTrue(REQUIRES_CHUNKED_RESPONSE);

    // Retrieve the data from the message parts
    regionNamePart = clientMessage.getPart(0);
    InterestResultPolicy policy;
    // Retrieve the interest type
    int interestType = clientMessage.getPart(1).getInt();

    // Retrieve the InterestResultPolicy
    try {
      policy = (InterestResultPolicy) clientMessage.getPart(2).getObject();
    } catch (Exception e) {
      writeChunkedException(clientMessage, e, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }
    boolean isDurable;
    try {
      Part durablePart = clientMessage.getPart(3);
      byte[] durablePartBytes = (byte[]) durablePart.getObject();
      isDurable = durablePartBytes[0] == 0x01;
    } catch (Exception e) {
      writeChunkedException(clientMessage, e, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }
    // Retrieve the key
    keyPart = clientMessage.getPart(4);
    regionName = regionNamePart.getCachedString();
    try {
      key = keyPart.getStringOrObject();
    } catch (Exception e) {
      writeChunkedException(clientMessage, e, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    boolean sendUpdatesAsInvalidates = false;

    // VJR: Check for a sixth part for client version 6.0.3 onwards for the
    // time being until refactoring into a new command version.
    if (clientMessage.getNumberOfParts() > 5) {
      try {
        Part notifyPart = clientMessage.getPart(5);
        byte[] notifyPartBytes = (byte[]) notifyPart.getObject();
        sendUpdatesAsInvalidates = notifyPartBytes[0] == 0x01;
      } catch (Exception e) {
        writeChunkedException(clientMessage, e, serverConnection);
        serverConnection.setAsTrue(RESPONDED);
        return;
      }
    }

    if (logger.isDebugEnabled()) {
      logger.debug("{}: Received register interest request ({} bytes) from {} for region {} key {}",
          serverConnection.getName(), clientMessage.getPayloadLength(),
          serverConnection.getSocketString(), regionName, key);
    }

    // Process the register interest request
    if (key == null || regionName == null) {
      String message = null;
      if (key == null) {
        message =
            "The input key for the register interest request is null";
      }
      if (regionName == null) {
        message =
            "The input region name for the register interest request is null.";
      }
      logger.warn("{}: {}", serverConnection.getName(), message);
      writeChunkedErrorResponse(clientMessage, MessageType.REGISTER_INTEREST_DATA_ERROR,
          message, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    // input key not null
    LocalRegion region = (LocalRegion) serverConnection.getCache().getRegion(regionName);
    if (region == null) {
      logger.info("{}: Region named {} was not found during register interest request.",
          new Object[] {serverConnection.getName(), regionName});
    }
    try {
      if (interestType == InterestType.REGULAR_EXPRESSION) {
        securityService.authorize(Resource.DATA, Operation.READ, regionName);
      } else {
        securityService.authorize(Resource.DATA, Operation.READ, regionName, key);
      }
      AuthorizeRequest authorizeRequest = serverConnection.getAuthzRequest();
      if (authorizeRequest != null) {
        if (!DynamicRegionFactory.regionIsDynamicRegionList(regionName)) {
          RegisterInterestOperationContext registerContext =
              authorizeRequest.registerInterestAuthorize(regionName, key, interestType, policy);
          key = registerContext.getKey();
        }
      }
      serverConnection.getAcceptor().getCacheClientNotifier().registerClientInterest(regionName,
          key, serverConnection.getProxyID(), interestType, isDurable, sendUpdatesAsInvalidates,
          false, 0, true);
    } catch (Exception e) {
      // If an interrupted exception is thrown , rethrow it
      checkForInterrupt(serverConnection, e);
      // Otherwise, write an exception message and continue
      writeChunkedException(clientMessage, e, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }

    CacheClientProxy ccp = serverConnection.getAcceptor().getCacheClientNotifier()
        .getClientProxy(serverConnection.getProxyID());
    if (ccp == null) {
      // fix for 37593
      IOException ioException = new IOException(
          "CacheClientProxy for this client is no longer on the server");
      writeChunkedException(clientMessage, ioException, serverConnection);
      serverConnection.setAsTrue(RESPONDED);
      return;
    }
    boolean isPrimary = ccp.isPrimary();
    ChunkedMessage chunkedResponseMsg = serverConnection.getRegisterInterestResponseMessage();
    if (!isPrimary) {
      chunkedResponseMsg.setMessageType(MessageType.RESPONSE_FROM_SECONDARY);
      chunkedResponseMsg.setTransactionId(clientMessage.getTransactionId());
      chunkedResponseMsg.sendHeader();
      chunkedResponseMsg.setLastChunk(true);

      if (logger.isDebugEnabled()) {
        logger.debug(
            "{}: Sending register interest response chunk from secondary for region: {} for key: {} chunk=<{}>",
            serverConnection.getName(), regionName, key, chunkedResponseMsg);
      }
      chunkedResponseMsg.sendChunk(serverConnection);
    } else { // isPrimary

      // Send header which describes how many chunks will follow
      chunkedResponseMsg.setMessageType(MessageType.RESPONSE_FROM_PRIMARY);
      chunkedResponseMsg.setTransactionId(clientMessage.getTransactionId());
      chunkedResponseMsg.sendHeader();

      // Send chunk response
      try {
        fillAndSendRegisterInterestResponseChunks(region, key, interestType, policy,
            serverConnection);
        serverConnection.setAsTrue(RESPONDED);
      } catch (Exception e) {
        writeChunkedException(clientMessage, e, serverConnection, chunkedResponseMsg);
        serverConnection.setAsTrue(RESPONDED);
        return;
      }

      if (logger.isDebugEnabled()) {
        logger.debug(
            "{}: Sent register interest response for region {} key {}",
            serverConnection.getName(), regionName, key);
      }
    } // isPrimary
  }

}