tests/profiling/gatordmock/GatordMockService.cpp - ml/armnn - Gitiles

 //
 // Copyright © 2019 Arm Ltd. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 #include "GatordMockService.hpp"

 #include "../../src/profiling/CommandHandlerRegistry.hpp"

 #include <cerrno>
 #include <fcntl.h>
 #include <iostream>
 #include <poll.h>
 #include <string>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>


 namespace armnn
 {

 namespace gatordmock
 {

 bool GatordMockService::OpenListeningSocket(std::string udsNamespace)
 {
     m_ListeningSocket = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
     if (-1 == m_ListeningSocket)
     {
         std::cerr << ": Socket construction failed: " << strerror(errno) << std::endl;
         return false;
     }

     sockaddr_un udsAddress;
     memset(&udsAddress, 0, sizeof(sockaddr_un));
     // We've set the first element of sun_path to be 0, skip over it and copy the namespace after it.
     memcpy(udsAddress.sun_path + 1, udsNamespace.c_str(), strlen(udsNamespace.c_str()));
     udsAddress.sun_family = AF_UNIX;

     // Bind the socket to the UDS namespace.
     if (-1 == bind(m_ListeningSocket, reinterpret_cast<const sockaddr *>(&udsAddress), sizeof(sockaddr_un)))
     {
         std::cerr << ": Binding on socket failed: " << strerror(errno) << std::endl;
         return false;
     }
     // Listen for 1 connection.
     if (-1 == listen(m_ListeningSocket, 1))
     {
         std::cerr << ": Listen call on socket failed: " << strerror(errno) << std::endl;
         return false;
     }
     if (m_EchoPackets)
     {
         std::cout << "Bound to UDS namespace: \\0" << udsNamespace << std::endl;
     }
     return true;
 }

 int GatordMockService::BlockForOneClient()
 {
     if (m_EchoPackets)
     {
         std::cout << "Waiting for client connection." << std::endl;
     }
     m_ClientConnection = accept4(m_ListeningSocket, nullptr, nullptr, SOCK_CLOEXEC);
     if (-1 == m_ClientConnection)
     {
         std::cerr << ": Failure when waiting for a client connection: " << strerror(errno) << std::endl;
         return -1;
     }

     if (m_EchoPackets)
     {
         std::cout << "Client connection established." << std::endl;
     }
     return m_ClientConnection;
 }

 bool GatordMockService::WaitForStreamMetaData()
 {
     if (m_EchoPackets)
     {
         std::cout << "Waiting for stream meta data..." << std::endl;
     }
     // The start of the stream metadata is 2x32bit words, 0 and packet length.
     u_char header[8];
     if (!ReadFromSocket(header, 8))
     {
         return false;
     }
     EchoPacket(PacketDirection::Received, header, 8);
     // The first word, stream_metadata_identifer, should always be 0.
     if (ToUint32(&header[0], TargetEndianness::BeWire) != 0)
     {
         std::cerr << ": Protocol error. The stream_metadata_identifer was not 0." << std::endl;
         return false;
     }

     u_char pipeMagic[4];
     if (!ReadFromSocket(pipeMagic, 4))
     {
         return false;
     }
     EchoPacket(PacketDirection::Received, pipeMagic, 4);

     // Before we interpret the length we need to read the pipe_magic word to determine endianness.
     if (ToUint32(&pipeMagic[0], TargetEndianness::BeWire) == PIPE_MAGIC)
     {
         m_Endianness = TargetEndianness::BeWire;
     }
     else if (ToUint32(&pipeMagic[0], TargetEndianness::LeWire) == PIPE_MAGIC)
     {
         m_Endianness = TargetEndianness::LeWire;
     }
     else
     {
         std::cerr << ": Protocol read error. Unable to read PIPE_MAGIC value." << std::endl;
         return false;
     }
     // Now we know the endianness we can get the length from the header.
     // Remember we already read the pipe magic 4 bytes.
     uint32_t metaDataLength = ToUint32(&header[4], m_Endianness) - 4;
     // Read the entire packet.
     u_char packetData[metaDataLength];
     if (metaDataLength != read(m_ClientConnection, &packetData, metaDataLength))
     {
         std::cerr << ": Protocol read error. Data length mismatch." << std::endl;
         return false;
     }
     EchoPacket(PacketDirection::Received, packetData, metaDataLength);
     m_StreamMetaDataVersion = ToUint32(&packetData[0], m_Endianness);
     m_StreamMetaDataMaxDataLen = ToUint32(&packetData[4], m_Endianness);
     m_StreamMetaDataPid = ToUint32(&packetData[8], m_Endianness);

     return true;
 }

 void GatordMockService::SendConnectionAck()
 {
     if (m_EchoPackets)
     {
         std::cout << "Sending connection acknowledgement." << std::endl;
     }
     // The connection ack packet is an empty data packet with packetId == 1.
     SendPacket(0, 1, nullptr, 0);
 }

 bool GatordMockService::LaunchReceivingThread()
 {
     if (m_EchoPackets)
     {
         std::cout << "Launching receiving thread." << std::endl;
     }
     // At this point we want to make the socket non blocking.
     const int currentFlags = fcntl(m_ClientConnection, F_GETFL);
     if (0 != fcntl(m_ClientConnection, F_SETFL, currentFlags | O_NONBLOCK))
     {
         close(m_ClientConnection);
         std::cerr << "Failed to set socket as non blocking: " << strerror(errno) << std::endl;
         return false;
     }
     m_ListeningThread = std::thread(&GatordMockService::ReceiveLoop, this, std::ref(*this));
     return true;
 }

 void GatordMockService::WaitForReceivingThread()
 {
     m_CloseReceivingThread.store(true);
     // Check that the receiving thread is running
     if (m_ListeningThread.joinable())
     {
         // Wait for the receiving thread to complete operations
         m_ListeningThread.join();
     }
 }


 void GatordMockService::SendPeriodicCounterSelectionList(uint period, std::vector<uint16_t> counters)
 {
     //get the datalength in bytes
     uint32_t datalength = static_cast<uint32_t>(4 + counters.size() * 2);

     u_char data[datalength];

     *data = static_cast<u_char>(period >> 24);
     *(data + 1) = static_cast<u_char>(period >> 16 & 0xFF);
     *(data + 2) = static_cast<u_char>(period >> 8 & 0xFF);
     *(data + 3) = static_cast<u_char>(period & 0xFF);

     for (unsigned long i = 0; i < counters.size(); ++i)
     {
         *(data + 4 + i * 2) = static_cast<u_char>(counters[i] >> 8);
         *(data + 5 + i * 2) = static_cast<u_char>(counters[i] & 0xFF);
     }

     // create packet send packet
     SendPacket(0, 4, data, datalength);
 }

 void GatordMockService::WaitCommand(uint timeout)
 {
     std::this_thread::sleep_for(std::chrono::microseconds(timeout));

     if (m_EchoPackets)
     {
         std::cout << std::dec << "Wait command with timeout of " << timeout << " microseconds completed. " << std::endl;
     }
 }

 void GatordMockService::ReceiveLoop(GatordMockService& mockService)
 {
     m_CloseReceivingThread.store(false);
     while (!m_CloseReceivingThread.load())
     {
         try
         {
             armnn::profiling::Packet packet = mockService.WaitForPacket(500);
         }
         catch(armnn::TimeoutException)
         {
             // In this case we ignore timeouts and and keep trying to receive.
         }
     }
 }

 armnn::profiling::Packet GatordMockService::WaitForPacket(uint32_t timeoutMs)
 {
     // Is there currently more than a headers worth of data waiting to be read?
     int bytes_available;
     ioctl(m_ClientConnection, FIONREAD, &bytes_available);
     if (bytes_available > 8)
     {
         // Yes there is. Read it:
         return ReceivePacket();
     }
     else
     {
         // No there's not. Poll for more data.
         struct pollfd pollingFd[1]{};
         pollingFd[0].fd = m_ClientConnection;
         int pollResult = poll(pollingFd, 1, static_cast<int>(timeoutMs));

         switch (pollResult)
         {
             // Error
             case -1:
                 throw armnn::RuntimeException(std::string("File descriptor reported an error during polling: ") +
                                               strerror(errno));

             // Timeout
             case 0:
                 throw armnn::TimeoutException("Timeout while waiting to receive packet.");

             // Normal poll return. It could still contain an error signal
             default:

                 // Check if the socket reported an error
                 if (pollingFd[0].revents & (POLLNVAL | POLLERR | POLLHUP))
                 {
                     std::cout << "Error while polling receiving socket." << std::endl;
                     throw armnn::RuntimeException(std::string("File descriptor reported an error during polling: ") +
                                                   strerror(errno));
                 }

                 // Check if there is data to read
                 if (!(pollingFd[0].revents & (POLLIN)))
                 {
                     // This is a corner case. The socket as been woken up but not with any data.
                     // We'll throw a timeout exception to loop around again.
                     throw armnn::TimeoutException("File descriptor was polled but no data was available to receive.");
                 }
                 return ReceivePacket();
         }
     }
 }


 armnn::profiling::Packet GatordMockService::ReceivePacket()
 {
     uint32_t header[2];
     if (!ReadHeader(header))
     {
         return armnn::profiling::Packet();
     }
     // Read data_length bytes from the socket.
     std::unique_ptr<unsigned char[]> uniquePacketData = std::make_unique<unsigned char[]>(header[1]);
     unsigned char *packetData = reinterpret_cast<unsigned char *>(uniquePacketData.get());

     if (!ReadFromSocket(packetData, header[1]))
     {
         return armnn::profiling::Packet();
     }

     // Construct received packet
     armnn::profiling::Packet packetRx = armnn::profiling::Packet(header[0], header[1], uniquePacketData);

     // Pass packet into the handler registry
     if (packetRx.GetHeader()!= 0)
     {
         m_PacketsReceivedCount.operator++(std::memory_order::memory_order_release);
         m_HandlerRegistry.GetFunctor(header[0],1)->operator()(packetRx);
     }

     EchoPacket(PacketDirection::Received, packetData, sizeof(packetData));
     return packetRx;
 }

 bool GatordMockService::SendPacket(uint32_t packetFamily, uint32_t packetId, const u_char* data, uint32_t dataLength)
 {
     // Construct a packet from the id and data given and send it to the client.
     // Encode the header.
     uint32_t header[2];
     header[0] = packetFamily << 26 | packetId << 16;
     header[1] = dataLength;
     // Add the header to the packet.
     u_char packet[8 + dataLength ];
     InsertU32(header[0], packet, m_Endianness);
     InsertU32(header[1], packet + 4, m_Endianness);
     // And the rest of the data if there is any.
     if (dataLength > 0)
     {
         memcpy((packet + 8), data, dataLength);
     }
     EchoPacket(PacketDirection::Sending, packet, sizeof(packet));
     if (-1 == write(m_ClientConnection, packet, sizeof(packet)))
     {
         std::cerr << ": Failure when writing to client socket: " << strerror(errno) << std::endl;
         return false;
     }
     return true;
 }

 bool GatordMockService::ReadHeader(uint32_t headerAsWords[2])
 {
     // The herader will always be 2x32bit words.
     u_char header[8];
     if (!ReadFromSocket(header, 8))
     {
         return false;
     }
     headerAsWords[0] = ToUint32(&header[0], m_Endianness);
     headerAsWords[1] = ToUint32(&header[4], m_Endianness);
     return true;
 }

 bool GatordMockService::ReadFromSocket(u_char* packetData, uint32_t expectedLength)
 {
     // This is a blocking read until either expectedLength has been received or an error is detected.
     ssize_t totalBytesRead = 0;
     while (totalBytesRead < expectedLength)
     {
         ssize_t bytesRead = recv(m_ClientConnection, packetData, expectedLength, 0);
         if (bytesRead < 0)
         {
             std::cerr << ": Failure when reading from client socket: " << strerror(errno) << std::endl;
             return false;
         }
         if (bytesRead == 0)
         {
             std::cerr << ": EOF while reading from client socket." << std::endl;
             return false;
         }
         totalBytesRead += bytesRead;
     }
     return true;
 };

 void GatordMockService::EchoPacket(PacketDirection direction, u_char* packet, size_t lengthInBytes)
 {
     // If enabled print the contents of the data packet to the console.
     if (m_EchoPackets)
     {
         if (direction == PacketDirection::Sending)
         {
             std::cout << "Sending " << std::dec << lengthInBytes << " bytes : ";
         } else
         {
             std::cout << "Received " << std::dec << lengthInBytes << " bytes : ";
         }
         for (unsigned int i = 0; i < lengthInBytes; i++)
         {
             if ((i % 10) == 0)
             {
                 std::cout << std::endl;
             }
             std::cout << std::hex << "0x" << static_cast<unsigned int>(packet[i]) << " ";
         }
         std::cout << std::endl;
     }
 }

 uint32_t GatordMockService::ToUint32(u_char* data, TargetEndianness endianness)
 {
     // Extract the first 4 bytes starting at data and push them into a 32bit integer based on the
     // specified endianness.
     if (endianness == TargetEndianness::BeWire)
     {
         return static_cast<uint32_t>(data[0]) << 24 | static_cast<uint32_t>(data[1]) << 16 |
                static_cast<uint32_t>(data[2]) << 8 | static_cast<uint32_t>(data[3]);
     }
     else
     {
         return static_cast<uint32_t>(data[3]) << 24 | static_cast<uint32_t>(data[2]) << 16 |
                static_cast<uint32_t>(data[1]) << 8 | static_cast<uint32_t>(data[0]);
     }
 }

 void GatordMockService::InsertU32(uint32_t value, u_char* data, TargetEndianness endianness)
 {
     // Take the bytes of a 32bit integer and copy them into char array starting at data considering
     // the endianness value.
     if (endianness == TargetEndianness::BeWire)
     {
         *data = static_cast<u_char>((value >> 24) & 0xFF);
         *(data + 1) = static_cast<u_char>((value >> 16) & 0xFF);
         *(data + 2) = static_cast<u_char>((value >> 8) & 0xFF);
         *(data + 3) = static_cast<u_char>(value & 0xFF);
     }
     else
     {
         *(data + 3) = static_cast<u_char>((value >> 24) & 0xFF);
         *(data + 2) = static_cast<u_char>((value >> 16) & 0xFF);
         *(data + 1) = static_cast<u_char>((value >> 8) & 0xFF);
         *data = static_cast<u_char>(value & 0xFF);
     }
 }

 } // namespace gatordmock

 } // namespace armnn
	//
	// Copyright © 2019 Arm Ltd. All rights reserved.
	// SPDX-License-Identifier: MIT
	//
	#include "GatordMockService.hpp"

	#include "../../src/profiling/CommandHandlerRegistry.hpp"

	#include <cerrno>
	#include <fcntl.h>
	#include <iostream>
	#include <poll.h>
	#include <string>
	#include <sys/ioctl.h>
	#include <sys/socket.h>
	#include <sys/un.h>
	#include <unistd.h>


	namespace armnn
	{

	namespace gatordmock
	{

	bool GatordMockService::OpenListeningSocket(std::string udsNamespace)
	{
	m_ListeningSocket = socket(PF_UNIX, SOCK_STREAM \| SOCK_CLOEXEC, 0);
	if (-1 == m_ListeningSocket)
	{
	std::cerr << ": Socket construction failed: " << strerror(errno) << std::endl;
	return false;
	}

	sockaddr_un udsAddress;
	memset(&udsAddress, 0, sizeof(sockaddr_un));
	// We've set the first element of sun_path to be 0, skip over it and copy the namespace after it.
	memcpy(udsAddress.sun_path + 1, udsNamespace.c_str(), strlen(udsNamespace.c_str()));
	udsAddress.sun_family = AF_UNIX;

	// Bind the socket to the UDS namespace.
	if (-1 == bind(m_ListeningSocket, reinterpret_cast<const sockaddr *>(&udsAddress), sizeof(sockaddr_un)))
	{
	std::cerr << ": Binding on socket failed: " << strerror(errno) << std::endl;
	return false;
	}
	// Listen for 1 connection.
	if (-1 == listen(m_ListeningSocket, 1))
	{
	std::cerr << ": Listen call on socket failed: " << strerror(errno) << std::endl;
	return false;
	}
	if (m_EchoPackets)
	{
	std::cout << "Bound to UDS namespace: \\0" << udsNamespace << std::endl;
	}
	return true;
	}

	int GatordMockService::BlockForOneClient()
	{
	if (m_EchoPackets)
	{
	std::cout << "Waiting for client connection." << std::endl;
	}
	m_ClientConnection = accept4(m_ListeningSocket, nullptr, nullptr, SOCK_CLOEXEC);
	if (-1 == m_ClientConnection)
	{
	std::cerr << ": Failure when waiting for a client connection: " << strerror(errno) << std::endl;
	return -1;
	}

	if (m_EchoPackets)
	{
	std::cout << "Client connection established." << std::endl;
	}
	return m_ClientConnection;
	}

	bool GatordMockService::WaitForStreamMetaData()
	{
	if (m_EchoPackets)
	{
	std::cout << "Waiting for stream meta data..." << std::endl;
	}
	// The start of the stream metadata is 2x32bit words, 0 and packet length.
	u_char header[8];
	if (!ReadFromSocket(header, 8))
	{
	return false;
	}
	EchoPacket(PacketDirection::Received, header, 8);
	// The first word, stream_metadata_identifer, should always be 0.
	if (ToUint32(&header[0], TargetEndianness::BeWire) != 0)
	{
	std::cerr << ": Protocol error. The stream_metadata_identifer was not 0." << std::endl;
	return false;
	}

	u_char pipeMagic[4];
	if (!ReadFromSocket(pipeMagic, 4))
	{
	return false;
	}
	EchoPacket(PacketDirection::Received, pipeMagic, 4);

	// Before we interpret the length we need to read the pipe_magic word to determine endianness.
	if (ToUint32(&pipeMagic[0], TargetEndianness::BeWire) == PIPE_MAGIC)
	{
	m_Endianness = TargetEndianness::BeWire;
	}
	else if (ToUint32(&pipeMagic[0], TargetEndianness::LeWire) == PIPE_MAGIC)
	{
	m_Endianness = TargetEndianness::LeWire;
	}
	else
	{
	std::cerr << ": Protocol read error. Unable to read PIPE_MAGIC value." << std::endl;
	return false;
	}
	// Now we know the endianness we can get the length from the header.
	// Remember we already read the pipe magic 4 bytes.
	uint32_t metaDataLength = ToUint32(&header[4], m_Endianness) - 4;
	// Read the entire packet.
	u_char packetData[metaDataLength];
	if (metaDataLength != read(m_ClientConnection, &packetData, metaDataLength))
	{
	std::cerr << ": Protocol read error. Data length mismatch." << std::endl;
	return false;
	}
	EchoPacket(PacketDirection::Received, packetData, metaDataLength);
	m_StreamMetaDataVersion = ToUint32(&packetData[0], m_Endianness);
	m_StreamMetaDataMaxDataLen = ToUint32(&packetData[4], m_Endianness);
	m_StreamMetaDataPid = ToUint32(&packetData[8], m_Endianness);

	return true;
	}

	void GatordMockService::SendConnectionAck()
	{
	if (m_EchoPackets)
	{
	std::cout << "Sending connection acknowledgement." << std::endl;
	}
	// The connection ack packet is an empty data packet with packetId == 1.
	SendPacket(0, 1, nullptr, 0);
	}

	bool GatordMockService::LaunchReceivingThread()
	{
	if (m_EchoPackets)
	{
	std::cout << "Launching receiving thread." << std::endl;
	}
	// At this point we want to make the socket non blocking.
	const int currentFlags = fcntl(m_ClientConnection, F_GETFL);
	if (0 != fcntl(m_ClientConnection, F_SETFL, currentFlags \| O_NONBLOCK))
	{
	close(m_ClientConnection);
	std::cerr << "Failed to set socket as non blocking: " << strerror(errno) << std::endl;
	return false;
	}
	m_ListeningThread = std::thread(&GatordMockService::ReceiveLoop, this, std::ref(*this));
	return true;
	}

	void GatordMockService::WaitForReceivingThread()
	{
	m_CloseReceivingThread.store(true);
	// Check that the receiving thread is running
	if (m_ListeningThread.joinable())
	{
	// Wait for the receiving thread to complete operations
	m_ListeningThread.join();
	}
	}


	void GatordMockService::SendPeriodicCounterSelectionList(uint period, std::vector<uint16_t> counters)
	{
	//get the datalength in bytes
	uint32_t datalength = static_cast<uint32_t>(4 + counters.size() * 2);

	u_char data[datalength];

	*data = static_cast<u_char>(period >> 24);
	*(data + 1) = static_cast<u_char>(period >> 16 & 0xFF);
	*(data + 2) = static_cast<u_char>(period >> 8 & 0xFF);
	*(data + 3) = static_cast<u_char>(period & 0xFF);

	for (unsigned long i = 0; i < counters.size(); ++i)
	{
	(data + 4 + i 2) = static_cast<u_char>(counters[i] >> 8);
	(data + 5 + i 2) = static_cast<u_char>(counters[i] & 0xFF);
	}

	// create packet send packet
	SendPacket(0, 4, data, datalength);
	}

	void GatordMockService::WaitCommand(uint timeout)
	{
	std::this_thread::sleep_for(std::chrono::microseconds(timeout));

	if (m_EchoPackets)
	{
	std::cout << std::dec << "Wait command with timeout of " << timeout << " microseconds completed. " << std::endl;
	}
	}

	void GatordMockService::ReceiveLoop(GatordMockService& mockService)
	{
	m_CloseReceivingThread.store(false);
	while (!m_CloseReceivingThread.load())
	{
	try
	{
	armnn::profiling::Packet packet = mockService.WaitForPacket(500);
	}
	catch(armnn::TimeoutException)
	{
	// In this case we ignore timeouts and and keep trying to receive.
	}
	}
	}

	armnn::profiling::Packet GatordMockService::WaitForPacket(uint32_t timeoutMs)
	{
	// Is there currently more than a headers worth of data waiting to be read?
	int bytes_available;
	ioctl(m_ClientConnection, FIONREAD, &bytes_available);
	if (bytes_available > 8)
	{
	// Yes there is. Read it:
	return ReceivePacket();
	}
	else
	{
	// No there's not. Poll for more data.
	struct pollfd pollingFd[1]{};
	pollingFd[0].fd = m_ClientConnection;
	int pollResult = poll(pollingFd, 1, static_cast<int>(timeoutMs));

	switch (pollResult)
	{
	// Error
	case -1:
	throw armnn::RuntimeException(std::string("File descriptor reported an error during polling: ") +
	strerror(errno));

	// Timeout
	case 0:
	throw armnn::TimeoutException("Timeout while waiting to receive packet.");

	// Normal poll return. It could still contain an error signal
	default:

	// Check if the socket reported an error
	if (pollingFd[0].revents & (POLLNVAL \| POLLERR \| POLLHUP))
	{
	std::cout << "Error while polling receiving socket." << std::endl;
	throw armnn::RuntimeException(std::string("File descriptor reported an error during polling: ") +
	strerror(errno));
	}

	// Check if there is data to read
	if (!(pollingFd[0].revents & (POLLIN)))
	{
	// This is a corner case. The socket as been woken up but not with any data.
	// We'll throw a timeout exception to loop around again.
	throw armnn::TimeoutException("File descriptor was polled but no data was available to receive.");
	}
	return ReceivePacket();
	}
	}
	}


	armnn::profiling::Packet GatordMockService::ReceivePacket()
	{
	uint32_t header[2];
	if (!ReadHeader(header))
	{
	return armnn::profiling::Packet();
	}
	// Read data_length bytes from the socket.
	std::unique_ptr<unsigned char[]> uniquePacketData = std::make_unique<unsigned char[]>(header[1]);
	unsigned char packetData = reinterpret_cast<unsigned char >(uniquePacketData.get());

	if (!ReadFromSocket(packetData, header[1]))
	{
	return armnn::profiling::Packet();
	}

	// Construct received packet
	armnn::profiling::Packet packetRx = armnn::profiling::Packet(header[0], header[1], uniquePacketData);

	// Pass packet into the handler registry
	if (packetRx.GetHeader()!= 0)
	{
	m_PacketsReceivedCount.operator++(std::memory_order::memory_order_release);
	m_HandlerRegistry.GetFunctor(header[0],1)->operator()(packetRx);
	}

	EchoPacket(PacketDirection::Received, packetData, sizeof(packetData));
	return packetRx;
	}

	bool GatordMockService::SendPacket(uint32_t packetFamily, uint32_t packetId, const u_char* data, uint32_t dataLength)
	{
	// Construct a packet from the id and data given and send it to the client.
	// Encode the header.
	uint32_t header[2];
	header[0] = packetFamily << 26 \| packetId << 16;
	header[1] = dataLength;
	// Add the header to the packet.
	u_char packet[8 + dataLength ];
	InsertU32(header[0], packet, m_Endianness);
	InsertU32(header[1], packet + 4, m_Endianness);
	// And the rest of the data if there is any.
	if (dataLength > 0)
	{
	memcpy((packet + 8), data, dataLength);
	}
	EchoPacket(PacketDirection::Sending, packet, sizeof(packet));
	if (-1 == write(m_ClientConnection, packet, sizeof(packet)))
	{
	std::cerr << ": Failure when writing to client socket: " << strerror(errno) << std::endl;
	return false;
	}
	return true;
	}

	bool GatordMockService::ReadHeader(uint32_t headerAsWords[2])
	{
	// The herader will always be 2x32bit words.
	u_char header[8];
	if (!ReadFromSocket(header, 8))
	{
	return false;
	}
	headerAsWords[0] = ToUint32(&header[0], m_Endianness);
	headerAsWords[1] = ToUint32(&header[4], m_Endianness);
	return true;
	}

	bool GatordMockService::ReadFromSocket(u_char* packetData, uint32_t expectedLength)
	{
	// This is a blocking read until either expectedLength has been received or an error is detected.
	ssize_t totalBytesRead = 0;
	while (totalBytesRead < expectedLength)
	{
	ssize_t bytesRead = recv(m_ClientConnection, packetData, expectedLength, 0);
	if (bytesRead < 0)
	{
	std::cerr << ": Failure when reading from client socket: " << strerror(errno) << std::endl;
	return false;
	}
	if (bytesRead == 0)
	{
	std::cerr << ": EOF while reading from client socket." << std::endl;
	return false;
	}
	totalBytesRead += bytesRead;
	}
	return true;
	};

	void GatordMockService::EchoPacket(PacketDirection direction, u_char* packet, size_t lengthInBytes)
	{
	// If enabled print the contents of the data packet to the console.
	if (m_EchoPackets)
	{
	if (direction == PacketDirection::Sending)
	{
	std::cout << "Sending " << std::dec << lengthInBytes << " bytes : ";
	} else
	{
	std::cout << "Received " << std::dec << lengthInBytes << " bytes : ";
	}
	for (unsigned int i = 0; i < lengthInBytes; i++)
	{
	if ((i % 10) == 0)
	{
	std::cout << std::endl;
	}
	std::cout << std::hex << "0x" << static_cast<unsigned int>(packet[i]) << " ";
	}
	std::cout << std::endl;
	}
	}

	uint32_t GatordMockService::ToUint32(u_char* data, TargetEndianness endianness)
	{
	// Extract the first 4 bytes starting at data and push them into a 32bit integer based on the
	// specified endianness.
	if (endianness == TargetEndianness::BeWire)
	{
	return static_cast<uint32_t>(data[0]) << 24 \| static_cast<uint32_t>(data[1]) << 16 \|
	static_cast<uint32_t>(data[2]) << 8 \| static_cast<uint32_t>(data[3]);
	}
	else
	{
	return static_cast<uint32_t>(data[3]) << 24 \| static_cast<uint32_t>(data[2]) << 16 \|
	static_cast<uint32_t>(data[1]) << 8 \| static_cast<uint32_t>(data[0]);
	}
	}

	void GatordMockService::InsertU32(uint32_t value, u_char* data, TargetEndianness endianness)
	{
	// Take the bytes of a 32bit integer and copy them into char array starting at data considering
	// the endianness value.
	if (endianness == TargetEndianness::BeWire)
	{
	*data = static_cast<u_char>((value >> 24) & 0xFF);
	*(data + 1) = static_cast<u_char>((value >> 16) & 0xFF);
	*(data + 2) = static_cast<u_char>((value >> 8) & 0xFF);
	*(data + 3) = static_cast<u_char>(value & 0xFF);
	}
	else
	{
	*(data + 3) = static_cast<u_char>((value >> 24) & 0xFF);
	*(data + 2) = static_cast<u_char>((value >> 16) & 0xFF);
	*(data + 1) = static_cast<u_char>((value >> 8) & 0xFF);
	*data = static_cast<u_char>(value & 0xFF);
	}
	}

	} // namespace gatordmock

	} // namespace armnn