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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 <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
#include <google/protobuf/message_lite.h>
#include <google/protobuf/wire_format_lite.h>
#include "drill/common.hpp"
#include "rpcMessage.hpp"
namespace Drill{
namespace rpc {
namespace {
using google::protobuf::internal::WireFormatLite;
using google::protobuf::io::CodedOutputStream;
using exec::rpc::CompleteRpcMessage;
static const uint32_t HEADER_TAG = WireFormatLite::MakeTag(CompleteRpcMessage::kHeaderFieldNumber, WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
static const uint32_t PROTOBUF_BODY_TAG = WireFormatLite::MakeTag(CompleteRpcMessage::kProtobufBodyFieldNumber, WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
static const uint32_t RAW_BODY_TAG = WireFormatLite::MakeTag(CompleteRpcMessage::kRawBodyFieldNumber, WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
static const uint32_t HEADER_TAG_LENGTH = CodedOutputStream::VarintSize32(HEADER_TAG);
static const uint32_t PROTOBUF_BODY_TAG_LENGTH = CodedOutputStream::VarintSize32(PROTOBUF_BODY_TAG);
}
std::size_t lengthDecode(const uint8_t* buf, uint32_t& length) {
using google::protobuf::io::CodedInputStream;
using google::protobuf::io::CodedOutputStream;
// read the frame to get the length of the message and then
CodedInputStream cis(buf, LEN_PREFIX_BUFLEN); // read LEN_PREFIX_BUFLEN bytes at most
int startPos(cis.CurrentPosition()); // for debugging
if (!cis.ReadVarint32(&length)) {
return -1;
}
#ifdef CODER_DEBUG
std::cerr << "length = " << length << std::endl;
#endif
int endPos(cis.CurrentPosition());
assert((endPos-startPos) == CodedOutputStream::VarintSize32(length));
return (endPos-startPos);
}
// 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 array in C++
bool decode(const uint8_t* buf, int length, InBoundRpcMessage& msg) {
using google::protobuf::io::CodedInputStream;
CodedInputStream cis(buf, length);
int startPos(cis.CurrentPosition()); // for debugging
CodedInputStream::Limit len_limit(cis.PushLimit(length));
uint32_t header_length(0);
if (!cis.ExpectTag(HEADER_TAG)) {
return false;
}
if (!cis.ReadVarint32(&header_length)) {
return false;
}
#ifdef CODER_DEBUG
std::cerr << "Reading header length " << header_length << ", post read index " << cis.CurrentPosition() << std::endl;
#endif
exec::rpc::RpcHeader header;
CodedInputStream::Limit header_limit(cis.PushLimit(header_length));
if (!header.ParseFromCodedStream(&cis)) {
return false;
}
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();
// read the protobuf body into a buffer.
if (!cis.ExpectTag(PROTOBUF_BODY_TAG)) {
return false;
}
uint32_t pbody_length(0);
if (!cis.ReadVarint32(&pbody_length)) {
return false;
}
#ifdef CODER_DEBUG
std::cerr << "Reading protobuf body length " << pbody_length << ", post read index " << cis.CurrentPosition() << std::endl;
#endif
msg.m_pbody.resize(pbody_length);
if (!cis.ReadRaw(msg.m_pbody.data(), pbody_length)) {
return false;
}
// read the data body.
if (cis.BytesUntilLimit() > 0 ) {
#ifdef CODER_DEBUG
std::cerr << "Reading raw body, buffer has "<< std::cis->BytesUntilLimit() << " bytes available, current possion "<< cis.CurrentPosition() << endl;
#endif
if (!cis.ExpectTag(RAW_BODY_TAG)) {
return false;
}
uint32_t dbody_length = 0;
if (!cis.ReadVarint32(&dbody_length)) {
return false;
}
if(cis.BytesUntilLimit() != dbody_length) {
#ifdef CODER_DEBUG
cerr << "Expected to receive a raw body of " << dbody_length << " bytes but received a buffer with " <<cis->BytesUntilLimit() << " bytes." << endl;
#endif
return false;
}
int currPos(cis.CurrentPosition());
int size;
cis.GetDirectBufferPointer(const_cast<const void**>(reinterpret_cast<void**>(&msg.m_dbody)), &size);
cis.Skip(size);
assert(dbody_length == size);
assert(msg.m_dbody==buf+currPos);
// Enforce assertion due to unexpected crashes during network error.
if (!((dbody_length == size) && (msg.m_dbody == (buf + currPos)))) {
return false;
}
#ifdef CODER_DEBUG
cerr << "Read raw body of " << dbody_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
std::cerr << "Inbound Rpc Message Decoded " << msg << std::endl;
#endif
int endPos = cis.CurrentPosition();
assert((endPos-startPos) == length);
// Enforce assertion due to unexpected crashes during network error.
if ((endPos - startPos) != length) {
return false;
}
return true;
}
bool encode(DataBuf& buf, const OutBoundRpcMessage& msg) {
using exec::rpc::RpcHeader;
using google::protobuf::io::CodedOutputStream;
// Todo:
//
// - let a context manager to allocate a buffer `ByteBuf buf = ctx.alloc().buffer();`
// - builder pattern
//
#ifdef CODER_DEBUG
std::cerr << "Encoding outbound message " << msg << std::endl;
#endif
RpcHeader header;
header.set_mode(msg.m_mode);
header.set_coordination_id(msg.m_coord_id);
header.set_rpc_type(msg.m_rpc_type);
// calcute the length of the message
int header_length = header.ByteSize();
int proto_body_length = msg.m_pbody->ByteSize();
int full_length = HEADER_TAG_LENGTH + CodedOutputStream::VarintSize32(header_length) + header_length + \
PROTOBUF_BODY_TAG_LENGTH + CodedOutputStream::VarintSize32(proto_body_length) + proto_body_length;
/*
if(raw_body_length > 0) {
full_length += (RAW_BODY_TAG_LENGTH + getRawVarintSize(raw_body_length) + raw_body_length);
}
*/
buf.resize(full_length + CodedOutputStream::VarintSize32(full_length));
uint8_t* data = buf.data();
#ifdef CODER_DEBUG
std::cerr << "Writing full length " << full_length << std::endl;
#endif
data = CodedOutputStream::WriteVarint32ToArray(full_length, data);
#ifdef CODER_DEBUG
std::cerr << "Writing header length " << header_length << std::endl;
#endif
data = CodedOutputStream::WriteVarint32ToArray(HEADER_TAG, data);
data = CodedOutputStream::WriteVarint32ToArray(header_length, data);
data = header.SerializeWithCachedSizesToArray(data);
// write protobuf body length and body
#ifdef CODER_DEBUG
std::cerr << "Writing protobuf body length " << proto_body_length << std::endl;
#endif
data = CodedOutputStream::WriteVarint32ToArray(PROTOBUF_BODY_TAG, data);
data = CodedOutputStream::WriteVarint32ToArray(proto_body_length, data);
msg.m_pbody->SerializeWithCachedSizesToArray(data);
// Done! no read to write data body for client
return true;
}
} // namespace rpc
} // namespace Drill
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