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From sudheeshkatkam <...@git.apache.org>
Subject [GitHub] drill pull request #773: DRILL-4335: Apache Drill should support network enc...
Date Tue, 02 May 2017 15:06:13 GMT
Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/773#discussion_r114334714
  
    --- Diff: exec/rpc/src/main/java/org/apache/drill/exec/rpc/SaslEncryptionHandler.java
---
    @@ -0,0 +1,184 @@
    +/*
    + * 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.
    + */
    +
    +package org.apache.drill.exec.rpc;
    +
    +import io.netty.buffer.ByteBuf;
    +import io.netty.buffer.CompositeByteBuf;
    +import io.netty.channel.ChannelHandlerContext;
    +import io.netty.handler.codec.MessageToMessageEncoder;
    +
    +import org.apache.drill.exec.exception.OutOfMemoryException;
    +
    +import java.io.IOException;
    +import java.nio.ByteBuffer;
    +import java.nio.ByteOrder;
    +import java.util.List;
    +
    +import static com.google.common.base.Preconditions.checkArgument;
    +
    +
    +/**
    + * Handler to wrap the input Composite ByteBuf components separately and append the encrypted
length for each
    + * component in the output ByteBuf. If there are multiple components in the input ByteBuf
then each component will be
    + * encrypted individually and added to output ByteBuf with it's length prepended.
    + * <p>
    + * Example:
    + * <li>Input ByteBuf  --> [B1,B2] - 2 component ByteBuf of 16K byte each.
    + * <li>Output ByteBuf --> [[EBLN1, EB1], [EBLN2, EB2]] - List of ByteBuf's with
each ByteBuf containing
    + *                    Encrypted Byte Length (EBLNx) in network order as per SASL RFC
and Encrypted Bytes (EBx).
    + * </p>
    + */
    +class SaslEncryptionHandler extends MessageToMessageEncoder<ByteBuf> {
    +
    +  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(
    +      SaslEncryptionHandler.class.getCanonicalName());
    +
    +  private final SaslCodec saslCodec;
    +
    +  private final int wrapSizeLimit;
    +
    +  private byte[] origMsgBuffer;
    +
    +  private final ByteBuffer lengthOctets;
    +
    +  private final OutOfMemoryHandler outOfMemoryHandler;
    +
    +  /**
    +   * We don't provide preference to allocator to use heap buffer instead of direct buffer.
    +   * Drill uses it's own buffer allocator which doesn't support heap buffer allocation.
We use
    +   * Drill buffer allocator in the channel.
    +   */
    +  SaslEncryptionHandler(SaslCodec saslCodec, final int wrapSizeLimit, final OutOfMemoryHandler
oomHandler) {
    +    this.saslCodec = saslCodec;
    +    this.wrapSizeLimit = wrapSizeLimit;
    +    this.outOfMemoryHandler = oomHandler;
    +
    +    // The maximum size of the component will be wrapSizeLimit. Since this is maximum
size, we can allocate once
    +    // and reuse it for each component encode.
    +    origMsgBuffer = new byte[this.wrapSizeLimit];
    +    lengthOctets = ByteBuffer.allocate(RpcConstants.LENGTH_FIELD_LENGTH);
    +    lengthOctets.order(ByteOrder.BIG_ENDIAN);
    +  }
    +
    +  @Override
    +  public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
    +    super.handlerAdded(ctx);
    +    logger.trace("Added " + RpcConstants.SASL_ENCRYPTION_HANDLER + " handler!");
    +  }
    +
    +  @Override
    +  public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
    +    super.handlerRemoved(ctx);
    +    logger.trace("Removed " + RpcConstants.SASL_ENCRYPTION_HANDLER + " handler");
    +  }
    +
    +  public void encode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)
throws IOException {
    +
    +    if (!ctx.channel().isOpen()) {
    +      logger.debug("In " + RpcConstants.SASL_ENCRYPTION_HANDLER + " and channel is not
open. " +
    +          "So releasing msg memory before encryption.");
    +      msg.release();
    +      return;
    +    }
    +
    +    try {
    +      // If encryption is enabled then this handler will always get ByteBuf of type Composite
ByteBuf
    +      checkArgument(msg instanceof CompositeByteBuf);
    --- End diff --
    
    `assert`


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