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/*
* 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.
*/
#include <iostream>
#include <google/protobuf/io/coded_stream.h>
#include "drill/common.hpp"
#include "rpcEncoder.hpp"
#include "rpcDecoder.hpp"
#include "rpcMessage.hpp"
namespace Drill{
// return the number of bytes we have read
int RpcDecoder::LengthDecode(const uint8_t* buf, uint32_t* p_length) {
using google::protobuf::io::CodedInputStream;
// read the frame to get the length of the message and then
CodedInputStream* cis = new CodedInputStream(buf, 5); // read 5 bytes at most
int pos0 = cis->CurrentPosition(); // for debugging
cis->ReadVarint32(p_length);
#ifdef CODER_DEBUG
cerr << "p_length = " << *p_length << endl;
#endif
int pos1 = cis->CurrentPosition();
#ifdef CODER_DEBUG
cerr << "Reading full length " << *p_length << endl;
#endif
assert( (pos1-pos0) == getRawVarintSize(*p_length));
delete cis;
return (pos1-pos0);
}
// TODO: error handling
//
// - assume that the entire message is in the buffer and the buffer is constrained to this message
// - easy to handle with raw arry in C++
int RpcDecoder::Decode(const uint8_t* buf, int length, InBoundRpcMessage& msg) {
using google::protobuf::io::CodedInputStream;
// if(!ctx.channel().isOpen()){ return; }
#ifdef EXTRA_DEBUGGING
std::cerr << "\nInbound rpc message received." << std::endl;
#endif
CodedInputStream* cis = new CodedInputStream(buf, length);
int pos0 = cis->CurrentPosition(); // for debugging
int len_limit = cis->PushLimit(length);
uint32_t header_length = 0;
cis->ExpectTag(RpcEncoder::HEADER_TAG);
cis->ReadVarint32(&header_length);
#ifdef CODER_DEBUG
cerr << "Reading header length " << header_length << ", post read index " << cis->CurrentPosition() << endl;
#endif
exec::rpc::RpcHeader header;
int header_limit = cis->PushLimit(header_length);
header.ParseFromCodedStream(cis);
cis->PopLimit(header_limit);
msg.m_has_mode = header.has_mode();
msg.m_mode = header.mode();
msg.m_coord_id = header.coordination_id();
msg.m_has_rpc_type = header.has_rpc_type();
msg.m_rpc_type = header.rpc_type();
//if(RpcConstants.EXTRA_DEBUGGING) logger.debug(" post header read index {}", buffer.readerIndex());
// read the protobuf body into a buffer.
cis->ExpectTag(RpcEncoder::PROTOBUF_BODY_TAG);
uint32_t p_body_length = 0;
cis->ReadVarint32(&p_body_length);
#ifdef CODER_DEBUG
cerr << "Reading protobuf body length " << p_body_length << ", post read index " << cis->CurrentPosition() << endl;
#endif
msg.m_pbody.resize(p_body_length);
cis->ReadRaw(msg.m_pbody.data(),p_body_length);
// read the data body.
if (cis->BytesUntilLimit() > 0 ) {
#ifdef CODER_DEBUG
cerr << "Reading raw body, buffer has "<< cis->BytesUntilLimit() << " bytes available, current possion "<< cis->CurrentPosition() << endl;
#endif
cis->ExpectTag(RpcEncoder::RAW_BODY_TAG);
uint32_t d_body_length = 0;
cis->ReadVarint32(&d_body_length);
if(cis->BytesUntilLimit() != d_body_length) {
#ifdef CODER_DEBUG
cerr << "Expected to receive a raw body of " << d_body_length << " bytes but received a buffer with " <<cis->BytesUntilLimit() << " bytes." << endl;
#endif
}
//msg.m_dbody.resize(d_body_length);
//cis->ReadRaw(msg.m_dbody.data(), d_body_length);
uint32_t currPos=cis->CurrentPosition();
cis->GetDirectBufferPointer((const void**)&msg.m_dbody, (int*)&d_body_length);
assert(msg.m_dbody==buf+currPos);
cis->Skip(d_body_length);
#ifdef CODER_DEBUG
cerr << "Read raw body of " << d_body_length << " bytes" << endl;
#endif
} else {
#ifdef CODER_DEBUG
cerr << "No need to read raw body, no readable bytes left." << endl;
#endif
}
cis->PopLimit(len_limit);
// return the rpc message.
// move the reader index forward so the next rpc call won't try to work with it.
// buffer.skipBytes(dBodyLength);
// messageCounter.incrementAndGet();
#ifdef CODER_DEBUG
cerr << "Inbound Rpc Message Decoded " << msg << endl;
#endif
int pos1 = cis->CurrentPosition();
assert((pos1-pos0) == length);
delete cis;
return (pos1-pos0);
}
}//namespace Drill
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