Github user sohami commented on a diff in the pull request: https://github.com/apache/drill/pull/809#discussion_r115860398 --- Diff: contrib/native/client/src/clientlib/drillClientImpl.cpp --- @@ -854,75 +990,328 @@ void DrillClientImpl::waitForResults(){ } } -status_t DrillClientImpl::readMsg(ByteBuf_t _buf, - AllocatedBufferPtr* allocatedBuffer, +/* + * Decode the length of the message from bufWithLen and then read entire message from the socket. + * Parameters: + * bufWithLen - in param - buffer containing the bytes which has length of the RPC message/encrypted chunk + * bufferWithLenBytes - out param - buffer pointer which points to memory allocated in this function and has the + * entire one RPC message / encrypted chunk along with the length of the message + * lengthBytesLength - out param - bytes of bufWithLen which contains the length of the entire RPC message or + * encrypted chunk + * lengthDecodeHandler - in param - function pointer with length decoder to use. For encrypted chunk we use + * lengthDecode and for plain RPC message we use rpcLengthDecode. + * Return: + * status_t - QRY_SUCCESS - In case of success. + * - QRY_COMM_ERROR/QRY_INTERNAL_ERROR/QRY_CLIENT_OUTOFMEM - In cases of error. + */ +status_t DrillClientImpl::readLenBytesFromSocket(ByteBuf_t bufWithLen, AllocatedBufferPtr* bufferWithLenBytes, + uint32_t& lengthBytesLength, lengthDecoder lengthDecodeHandler) { + + uint32_t rmsgLen = 0; + size_t bytes_read = 0; + size_t leftover = 0; + boost::system::error_code error; + *bufferWithLenBytes = NULL; + size_t bufferWithLenBytesSize = 0; + + bytes_read = (this->*lengthDecodeHandler)(bufWithLen, rmsgLen); + lengthBytesLength = bytes_read; + + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "Length bytes = " << bytes_read << std::endl;) + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "Msg Length = " << rmsgLen << std::endl;) + + if(rmsgLen>0){ + leftover = LEN_PREFIX_BUFLEN - bytes_read; + + // Allocate a buffer for reading all the bytes in bufWithLen and length number of bytes + bufferWithLenBytesSize = rmsgLen + bytes_read; + *bufferWithLenBytes = new AllocatedBuffer(bufferWithLenBytesSize); + + if(*bufferWithLenBytes == NULL){ + return handleQryError(QRY_CLIENT_OUTOFMEM, getMessage(ERR_QRY_OUTOFMEM), NULL); + } + + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "DrillClientImpl::readLenBytesFromSocket: Allocated and locked buffer: [ " + << *bufferWithLenBytes << ", size = " << bufferWithLenBytesSize << " ]\n";) + + // Copy the memory of bufWithLen into bufferWithLenBytesSize + memcpy((*bufferWithLenBytes)->m_pBuffer, bufWithLen, LEN_PREFIX_BUFLEN); + + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "Copied bufWithLen into bufferWithLenBytes. " + << "Now reading data (rmsgLen - leftover) : " << (rmsgLen - leftover) + << std::endl;) + + // Read the entire data left from socket and copy to currentBuffer. + ByteBuf_t b = (*bufferWithLenBytes)->m_pBuffer + LEN_PREFIX_BUFLEN; + size_t bytesToRead = rmsgLen - leftover; + + while(1){ + bytes_read = this->m_socket.read_some(boost::asio::buffer(b, bytesToRead), error); + if(error) break; + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "Data Message: actual bytes read = " << bytes_read << std::endl;) + if(bytes_read == bytesToRead) break; + bytesToRead -= bytes_read; + b += bytes_read; + } + } else { + return handleQryError(QRY_INTERNAL_ERROR, getMessage(ERR_QRY_INVREADLEN), NULL); + } + + return error ? handleQryError(QRY_COMM_ERROR, getMessage(ERR_QRY_COMMERR, error.message().c_str()), NULL) + : QRY_SUCCESS; +} + + +/* + * Function to read entire RPC message from socket and decode it to InboundRpcMessage + * Parameters: + * _buf - in param - Buffer containing the length bytes. + * allocatedBuffer - out param - Buffer containing the length bytes and entire RPC message bytes. + * msg - out param - Decoded InBoundRpcMessage from the bytes in allocatedBuffer + * Return: + * status_t - QRY_SUCCESS - In case of success. + * - QRY_COMM_ERROR/QRY_INTERNAL_ERROR/QRY_CLIENT_OUTOFMEM - In cases of error. + */ +status_t DrillClientImpl::readMsg(ByteBuf_t _buf, AllocatedBufferPtr* allocatedBuffer, rpc::InBoundRpcMessage& msg){ DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "DrillClientImpl::readMsg: Read message from buffer " - << reinterpret_cast<int*>(_buf) << std::endl;) - size_t leftover=0; - uint32_t rmsgLen; - AllocatedBufferPtr currentBuffer; - *allocatedBuffer=NULL; + << reinterpret_cast<int*>(_buf) << std::endl;) + *allocatedBuffer = NULL; { // We need to protect the readLength and read buffer, and the pending requests counter, // but we don't have to keep the lock while we decode the rest of the buffer. boost::lock_guard<boost::mutex> lock(this->m_dcMutex); - std::size_t bytes_read = rpc::lengthDecode(_buf, rmsgLen); - DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "len bytes = " << bytes_read << std::endl;) - DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "rmsgLen = " << rmsgLen << std::endl;) - - if(rmsgLen>0){ - leftover = LEN_PREFIX_BUFLEN - bytes_read; - // Allocate a buffer - currentBuffer=new AllocatedBuffer(rmsgLen); - DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "DrillClientImpl::readMsg: Allocated and locked buffer: [ " - << currentBuffer << ", size = " << rmsgLen << " ]\n";) - if(currentBuffer==NULL){ + uint32_t lengthFieldSize = 0; + + // Read the message length and extract length size bytes to form InBoundRpcMessage + status_t statusCode = readLenBytesFromSocket(_buf, allocatedBuffer, lengthFieldSize, &DrillClientImpl::rpcLengthDecode); + + // Check for error conditions + if(QRY_SUCCESS != statusCode) { + Utils::freeBuffer(_buf, LEN_PREFIX_BUFLEN); + return statusCode; + } + + // Get the message size + size_t msgLen = (*allocatedBuffer)->m_bufSize; + + // Read data successfully, now let's try to decode the buffer and form a valid RPC message. + // allocatedBuffer also contains the length bytes which is not needed by decodes so skip that part of buffer. + // We have it since in case of encryption the unwrap function expects it + if (!decode((*allocatedBuffer)->m_pBuffer + lengthFieldSize, msgLen - lengthFieldSize, msg)) { + Utils::freeBuffer(_buf, LEN_PREFIX_BUFLEN); + return handleQryError(QRY_COMM_ERROR, getMessage(ERR_QRY_COMMERR, "Cannot decode server message"), NULL); + } + + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "Successfully created a RPC message with Coordination id: " + << msg.m_coord_id << std::endl;) + } + DRILL_MT_LOG(DRILL_LOG(LOG_TRACE) << "DrillClientImpl::readMsg: Free buffer " + << reinterpret_cast<int*>(_buf) << std::endl;) + Utils::freeBuffer(_buf, LEN_PREFIX_BUFLEN); + return QRY_SUCCESS; +} + + +/* + * Read ENCRYPT_LEN_PREFIX_BUFLEN bytes to decode length of one complete encrypted chunk. The length bytes are expected + * to be in network order. It is converted to host order and the value is stored in rmsgLen parameter. + * Parameters: + * _buf - in param - ByteBuf_t containing atleast the length bytes. + * rmsgLen - out param - Contain the decoded value of length. + * Return: + * size_t - length bytes read to decode + */ +size_t DrillClientImpl::lengthDecode(const ByteBuf_t _buf, uint32_t& rmsgLen) { + memcpy(&rmsgLen, _buf, ENCRYPT_LEN_PREFIX_BUFLEN); + rmsgLen = ntohl(rmsgLen); + return ENCRYPT_LEN_PREFIX_BUFLEN; +} + +/* + * Wrapper which uses RPC message length decoder to get length of one complete RPC message from _buf. + * Parameters: + * _buf - in param - ByteBuf_t containing atleast the length bytes. + * rmsgLen - out param - Contain the decoded value of length. + * Return: + * size_t - length bytes read to decode + */ +size_t DrillClientImpl::rpcLengthDecode(const ByteBuf_t _buf, uint32_t& rmsgLen) { + return rpc::lengthDecode(_buf, rmsgLen); +} + + +/* + * Read all the encrypted chunk needed to form a complete RPC message. Read an entire chunk from network, decrypt it + * and put in a buffer. The same process is repeated until the entire buffer to form a completed RPC message is read. + * Parameters: + * _buf - in param - ByteBuf_t containing atleast the length bytes. --- End diff -- Same as above.
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