| /* |
| * 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.ByteBufOutputStream; |
| import io.netty.buffer.CompositeByteBuf; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.MessageToMessageEncoder; |
| |
| import java.io.OutputStream; |
| import java.util.List; |
| |
| import org.apache.drill.exec.proto.GeneralRPCProtos.CompleteRpcMessage; |
| import org.apache.drill.exec.proto.GeneralRPCProtos.RpcHeader; |
| |
| import com.google.protobuf.CodedOutputStream; |
| import com.google.protobuf.WireFormat; |
| |
| /** |
| * Converts an RPCMessage into wire format. |
| */ |
| class RpcEncoder extends MessageToMessageEncoder<OutboundRpcMessage>{ |
| final org.slf4j.Logger logger; |
| |
| static final int HEADER_TAG = makeTag(CompleteRpcMessage.HEADER_FIELD_NUMBER, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
| static final int PROTOBUF_BODY_TAG = makeTag(CompleteRpcMessage.PROTOBUF_BODY_FIELD_NUMBER, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
| static final int RAW_BODY_TAG = makeTag(CompleteRpcMessage.RAW_BODY_FIELD_NUMBER, WireFormat.WIRETYPE_LENGTH_DELIMITED); |
| static final int HEADER_TAG_LENGTH = getRawVarintSize(HEADER_TAG); |
| static final int PROTOBUF_BODY_TAG_LENGTH = getRawVarintSize(PROTOBUF_BODY_TAG); |
| static final int RAW_BODY_TAG_LENGTH = getRawVarintSize(RAW_BODY_TAG); |
| |
| public RpcEncoder(String name) { |
| this.logger = org.slf4j.LoggerFactory.getLogger(RpcEncoder.class.getCanonicalName() + "-" + name); |
| } |
| |
| @Override |
| protected void encode(ChannelHandlerContext ctx, OutboundRpcMessage msg, List<Object> out) throws Exception { |
| if (RpcConstants.EXTRA_DEBUGGING) { |
| logger.debug("Rpc Encoder called with msg {}", msg); |
| } |
| |
| if (!ctx.channel().isOpen()) { |
| //output.add(ctx.alloc().buffer(0)); |
| logger.debug("Channel closed, skipping encode."); |
| msg.release(); |
| return; |
| } |
| |
| try{ |
| if (RpcConstants.EXTRA_DEBUGGING) { |
| logger.debug("Encoding outbound message {}", msg); |
| } |
| // first we build the RpcHeader |
| RpcHeader header = RpcHeader.newBuilder() // |
| .setMode(msg.mode) // |
| .setCoordinationId(msg.coordinationId) // |
| .setRpcType(msg.rpcType).build(); |
| |
| // figure out the full length |
| int headerLength = header.getSerializedSize(); |
| int protoBodyLength = msg.pBody.getSerializedSize(); |
| int rawBodyLength = msg.getRawBodySize(); |
| int fullLength = // |
| HEADER_TAG_LENGTH + getRawVarintSize(headerLength) + headerLength + // |
| PROTOBUF_BODY_TAG_LENGTH + getRawVarintSize(protoBodyLength) + protoBodyLength; // |
| |
| if (rawBodyLength > 0) { |
| fullLength += (RAW_BODY_TAG_LENGTH + getRawVarintSize(rawBodyLength) + rawBodyLength); |
| } |
| |
| ByteBuf buf = ctx.alloc().buffer(); |
| OutputStream os = new ByteBufOutputStream(buf); |
| CodedOutputStream cos = CodedOutputStream.newInstance(os); |
| |
| // write full length first (this is length delimited stream). |
| cos.writeRawVarint32(fullLength); |
| |
| // write header |
| cos.writeRawVarint32(HEADER_TAG); |
| cos.writeRawVarint32(headerLength); |
| header.writeTo(cos); |
| |
| // write protobuf body length and body |
| cos.writeRawVarint32(PROTOBUF_BODY_TAG); |
| cos.writeRawVarint32(protoBodyLength); |
| msg.pBody.writeTo(cos); |
| |
| // if exists, write data body and tag. |
| if (msg.getRawBodySize() > 0) { |
| if(RpcConstants.EXTRA_DEBUGGING) { |
| logger.debug("Writing raw body of size {}", msg.getRawBodySize()); |
| } |
| |
| cos.writeRawVarint32(RAW_BODY_TAG); |
| cos.writeRawVarint32(rawBodyLength); |
| cos.flush(); // need to flush so that dbody goes after if cos is caching. |
| |
| final CompositeByteBuf cbb = ctx.alloc().compositeBuffer(msg.dBodies.length + 1); |
| cbb.addComponent(buf); |
| int bufLength = buf.readableBytes(); |
| for (ByteBuf b : msg.dBodies) { |
| cbb.addComponent(b); |
| bufLength += b.readableBytes(); |
| } |
| cbb.writerIndex(bufLength); |
| out.add(cbb); |
| } else { |
| cos.flush(); |
| out.add(buf); |
| } |
| |
| if (RpcConstants.SOME_DEBUGGING) { |
| logger.debug("Wrote message length {}:{} bytes (head:body). Message: " + msg, getRawVarintSize(fullLength), fullLength); |
| } |
| if (RpcConstants.EXTRA_DEBUGGING) { |
| logger.debug("Sent message. Ending writer index was {}.", buf.writerIndex()); |
| } |
| } finally { |
| // make sure to release Rpc Messages underlying byte buffers. |
| //msg.release(); |
| } |
| } |
| |
| /** Makes a tag value given a field number and wire type, copied from WireFormat since it isn't public. */ |
| static int makeTag(final int fieldNumber, final int wireType) { |
| return (fieldNumber << 3) | wireType; |
| } |
| |
| public static int getRawVarintSize(int value) { |
| int count = 0; |
| while (true) { |
| if ((value & ~0x7F) == 0) { |
| count++; |
| return count; |
| } else { |
| count++; |
| value >>>= 7; |
| } |
| } |
| } |
| |
| } |