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Packet and socket optimisations

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Sending/receiving data on a socket is roughly 5.5x faster, after removing data copies and buffer re-allocations.
This commit is contained in:
Fred Nicolson 2017-01-25 22:57:11 +00:00
parent 6b2947932a
commit fad7d0b81f
11 changed files with 148 additions and 205 deletions
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1
.gitignore vendored
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@ -1,2 +1,3 @@
.idea
cmake-build-debug
cmake-build-release

102
include/frnetlib/Packet.h
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@ -12,11 +12,13 @@
namespace fr
{
#define PACKET_HEADER_LENGTH sizeof(uint32_t)
class Packet
{
public:
Packet() noexcept
: buffer_offset(0)
: buffer_read_index(PACKET_HEADER_LENGTH),
buffer(PACKET_HEADER_LENGTH, '0')
{
}
@ -41,17 +43,6 @@ namespace fr
*this << part;
}
/*!
* Gets the data added to the packet
*
* @return A string containing all of the data added to the packet
*/
inline const std::string &get_buffer() const
{
return buffer;
}
/*
* Adds a vector to a packet
*/
@ -108,8 +99,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
return *this;
}
@ -131,8 +122,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohs(var);
return *this;
}
@ -155,8 +146,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohl(var);
return *this;
}
@ -179,8 +170,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohll(var);
return *this;
}
@ -203,8 +194,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohs((uint16_t)var);
return *this;
}
@ -227,8 +218,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohl((uint32_t)var);
return *this;
}
@ -251,8 +242,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohll((uint64_t)var);
return *this;
}
@ -275,8 +266,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);
var = ntohf(var);
return *this;
}
@ -299,8 +290,8 @@ namespace fr
{
assert_data_remaining(sizeof(var));
memcpy(&var, &buffer[buffer_offset], sizeof(var));
buffer_offset += sizeof(var);;
memcpy(&var, &buffer[buffer_read_index], sizeof(var));
buffer_read_index += sizeof(var);;
var = ntohd(var);
return *this;
}
@ -333,8 +324,8 @@ namespace fr
uint32_t length;
*this >> length;
var = buffer.substr(buffer_offset, length);
buffer_offset += length;
var = buffer.substr(buffer_read_index, length);
buffer_read_index += length;
return *this;
}
@ -354,20 +345,50 @@ namespace fr
*/
inline void clear()
{
buffer.clear();
buffer_offset = 0;
buffer.erase(PACKET_HEADER_LENGTH, buffer.size() - PACKET_HEADER_LENGTH);
buffer_read_index = PACKET_HEADER_LENGTH;
}
/*!
* Resets the buffer read cursor back to the beginning
* of the packet.
* Resets the read cursor back to 0, or a specified position.
*
* @param pos The buffer index to continue reading from.
*/
inline void reset_read_cursor()
inline void reset_read_cursor(size_t pos = 0)
{
buffer_offset = 0;
buffer_read_index = PACKET_HEADER_LENGTH + pos;
}
/*!
* Reserves space in the internal packet buffer,
* for if you know how much data you expect to receive
* or send.
*
* @param bytes The number of bytes to reserve
*/
inline void reserve(size_t bytes)
{
buffer.reserve(PACKET_HEADER_LENGTH + bytes);
}
private:
friend class Socket;
/*!
* Gets the data added to the packet
*
* @return A string containing all of the data added to the packet
*/
inline std::string &get_buffer()
{
//Update packet length first
uint32_t length = htonl((uint32_t)buffer.size() - PACKET_HEADER_LENGTH);
memcpy(&buffer[0], &length, sizeof(uint32_t));
//Then a reference to the buffer
return buffer;
}
/*!
* Checks that there's enough data in the buffer to extract
* a given number of bytes to prevent buffer overflows.
@ -377,12 +398,13 @@ namespace fr
*/
inline void assert_data_remaining(size_t required_space)
{
if(buffer_offset + required_space > buffer.size())
if(buffer_read_index + required_space > buffer.size())
throw std::out_of_range("Not enough bytes remaining in packet to extract requested");
}
std::string buffer; //Packet data buffer
size_t buffer_offset; //Current read position
size_t buffer_read_index; //Current read position
};
}

10
include/frnetlib/SSLSocket.h
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@ -98,17 +98,7 @@ namespace fr
abort();
}
/*!
* Checks to see if there's data still in the socket's
* recv buffer.
*
* @return True if there is data in the buffer, false otherwise.
*/
virtual bool has_data() const override;
private:
std::string unprocessed_buffer;
std::unique_ptr<char[]> recv_buffer;
std::shared_ptr<SSLContext> ssl_context;
std::unique_ptr<mbedtls_net_context> ssl_socket_descriptor;

14
include/frnetlib/Socket.h
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@ -5,7 +5,7 @@
#ifndef FRNETLIB_SOCKET_H
#define FRNETLIB_SOCKET_H
#include <mutex>
#include "NetworkEncoding.h"
#include "Packet.h"
@ -95,7 +95,8 @@ namespace fr
* @param packet The packet to send
* @return True on success, false on failure.
*/
Status send(const Packet &packet);
Status send(Packet &packet);
Status send(Packet &&packet);
/*!
* Receive a packet through the socket
@ -146,13 +147,6 @@ namespace fr
*/
void shutdown();
/*!
* Checks to see if there's data still in the socket's
* recv buffer.
*
* @return True if there is data in the buffer, false otherwise.
*/
virtual bool has_data() const = 0;
protected:
/*!
@ -164,6 +158,8 @@ namespace fr
std::string remote_address;
bool is_blocking;
bool is_connected;
std::mutex outbound_mutex;
std::mutex inbound_mutex;
#ifdef _WIN32
static WSADATA wsaData;

1
include/frnetlib/TcpListener.h
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@ -45,7 +45,6 @@ private:
virtual fr::Socket::Status send_raw(const char*, size_t){return Socket::Error;}
virtual fr::Socket::Status receive_raw(void*, size_t, size_t&){return Socket::Error;}
virtual int32_t get_socket_descriptor() const {return socket_descriptor;}
virtual bool has_data() const override {return false;};
};
}

16
include/frnetlib/TcpSocket.h
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@ -19,9 +19,7 @@ public:
TcpSocket() noexcept;
virtual ~TcpSocket() noexcept;
TcpSocket(TcpSocket &&other) noexcept
: unprocessed_buffer(std::move(other.unprocessed_buffer)),
recv_buffer(std::move(other.recv_buffer)),
socket_descriptor(other.socket_descriptor){}
: socket_descriptor(other.socket_descriptor){}
void operator=(const TcpSocket &other)=delete;
/*!
@ -95,20 +93,8 @@ public:
*/
int32_t get_socket_descriptor() const override;
/*!
* Checks to see if there's data still in the socket's
* recv buffer.
*
* @return True if there is data in the buffer, false otherwise.
*/
virtual bool has_data() const override;
protected:
std::string unprocessed_buffer;
std::unique_ptr<char[]> recv_buffer;
int32_t socket_descriptor;
std::mutex outbound_mutex;
std::mutex inbound_mutex;
};
}

72
main.cpp
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@ -3,6 +3,7 @@
#include <thread>
#include <atomic>
#include <mutex>
#include <chrono>
#include "frnetlib/Packet.h"
#include "frnetlib/TcpSocket.h"
#include "frnetlib/TcpListener.h"
@ -17,65 +18,50 @@
void server()
{
fr::TcpListener listener;
fr::TcpSocket client;
listener.listen("9092");
listener.listen("8081");
listener.accept(client);
uint32_t packet_no = 0;
fr::TcpSocket socket;
listener.accept(socket);
uint64_t packet_count = 0;
auto last_print_time = std::chrono::system_clock::now();
while(true)
{
fr::Packet packet;
client.receive(packet);
if(socket.receive(packet) != fr::Socket::Success)
break;
uint32_t num = 0;
packet >> num;
std::string s1;
packet >> s1;
if(num != ++packet_no)
packet_count++;
if(last_print_time + std::chrono::seconds(1) < std::chrono::system_clock::now())
{
std::cout << "Packet mismatch. Expected " << packet_no + 1 << ". Got " << num << std::endl;
return;
}
std::cout << "Packets per second: " << packet_count << std::endl;
packet_count = 0;
last_print_time = std::chrono::system_clock::now();
}
}
void client()
{
fr::TcpSocket server;
server.connect("127.0.0.1", "8081");
uint32_t packet_no = 0;
std::mutex m1;
auto lam = [&]()
{
while(true)
{
m1.lock();
fr::Packet packet;
packet << ++packet_no;
m1.unlock();
server.send(packet);
}
};
std::thread t1(lam);
std::thread t2(lam);
std::thread t3(lam);
std::thread t4(lam);
t1.join();
}
int main()
{
std::thread s1(server);
std::thread server_thread(server);
std::this_thread::sleep_for(std::chrono::milliseconds(100));
std::thread c1(client);
s1.join();
c1.join();
return 0;
fr::TcpSocket socket;
socket.connect("127.0.0.1", "9092");
std::string a(32384, 'c');
fr::Packet packet;
while(true)
{
packet << a;
if(socket.send(packet) != fr::Socket::Success)
break;
packet.clear();
}
server_thread.join();
}

28
src/SSLSocket.cpp
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@ -9,8 +9,7 @@
namespace fr
{
SSLSocket::SSLSocket(std::shared_ptr<SSLContext> ssl_context_) noexcept
: recv_buffer(new char[RECV_CHUNK_SIZE]),
ssl_context(ssl_context_)
: ssl_context(ssl_context_)
{
//Initialise mbedtls structures
mbedtls_ssl_config_init(&conf);
@ -55,15 +54,12 @@ namespace fr
Socket::Status SSLSocket::receive_raw(void *data, size_t data_size, size_t &received)
{
std::lock_guard<std::mutex> guard(inbound_mutex);
int read = MBEDTLS_ERR_SSL_WANT_READ;
received = 0;
if(unprocessed_buffer.size() < data_size)
{
while(read == MBEDTLS_ERR_SSL_WANT_READ || read == MBEDTLS_ERR_SSL_WANT_WRITE)
{
read = mbedtls_ssl_read(ssl.get(), (unsigned char *)recv_buffer.get(), RECV_CHUNK_SIZE);
read = mbedtls_ssl_read(ssl.get(), (unsigned char *)data, data_size);
}
if(read == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY)
@ -78,19 +74,6 @@ namespace fr
}
received += read;
unprocessed_buffer += {recv_buffer.get(), (size_t)read};
if(received > data_size)
received = data_size;
}
else
{
received = data_size;
}
//Copy data to where it needs to go
memcpy(data, &unprocessed_buffer[0], received);
unprocessed_buffer.erase(0, received);
return Socket::Status::Success;
}
@ -171,11 +154,6 @@ namespace fr
ssl_socket_descriptor = std::move(context);
reconfigure_socket();
}
bool SSLSocket::has_data() const
{
return !unprocessed_buffer.empty();
}
}
#endif

25
src/Socket.cpp
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@ -2,6 +2,7 @@
// Created by fred on 06/12/16.
//
#include <mutex>
#include "frnetlib/NetworkEncoding.h"
#include "frnetlib/Socket.h"
@ -30,20 +31,21 @@ namespace fr
#endif // _WIN32
}
Socket::Status Socket::send(const Packet &packet)
Socket::Status Socket::send(Packet &packet)
{
if(!is_connected)
return Socket::Disconnected;
//Get packet data
std::string data = packet.get_buffer();
std::string &data = packet.get_buffer();
return send_raw(data.c_str(), data.size());
}
//Prepend packet length
uint32_t length = htonl((uint32_t)data.size());
data.insert(0, "1234");
memcpy(&data[0], &length, sizeof(uint32_t));
Socket::Status Socket::send(Packet &&packet)
{
if(!is_connected)
return Socket::Disconnected;
//Send it
std::string &data = packet.get_buffer();
return send_raw(data.c_str(), data.size());
}
@ -53,6 +55,7 @@ namespace fr
return Socket::Disconnected;
Socket::Status status;
std::lock_guard<std::mutex> guard(inbound_mutex);
//Try to read packet length
uint32_t packet_length = 0;
@ -62,13 +65,11 @@ namespace fr
packet_length = ntohl(packet_length);
//Now we've got the length, read the rest of the data in
std::string data(packet_length, 'c');
status = receive_all(&data[0], packet_length);
packet.buffer.resize(packet_length + PACKET_HEADER_LENGTH);
status = receive_all(&packet.buffer[PACKET_HEADER_LENGTH], packet_length);
if(status != Socket::Status::Success)
return status;
//Set the packet to what we've read
packet.set_buffer(std::move(data));
return Socket::Status::Success;
}

1
src/SocketSelector.cpp
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@ -3,6 +3,7 @@
//
#include <thread>
#include <mutex>
#include "frnetlib/SocketSelector.h"
namespace fr

21
src/TcpSocket.cpp
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@ -9,7 +9,6 @@ namespace fr
{
TcpSocket::TcpSocket() noexcept
: recv_buffer(new char[RECV_CHUNK_SIZE])
{
}
@ -56,16 +55,13 @@ namespace fr
Socket::Status TcpSocket::receive_raw(void *data, size_t buffer_size, size_t &received)
{
std::lock_guard<std::mutex> guard(inbound_mutex);
received = 0;
if(unprocessed_buffer.size() < buffer_size)
{
//Read RECV_CHUNK_SIZE bytes into the recv buffer
ssize_t status = ::recv(socket_descriptor, recv_buffer.get(), RECV_CHUNK_SIZE, 0);
ssize_t status = ::recv(socket_descriptor, data, buffer_size, 0);
if(status > 0)
{
unprocessed_buffer += {recv_buffer.get(), (size_t)status};
received += status;
}
else
@ -85,15 +81,7 @@ namespace fr
if(received > buffer_size)
received = buffer_size;
}
else
{
received = buffer_size;
}
//Copy data to where it needs to go
memcpy(data, &unprocessed_buffer[0], received);
unprocessed_buffer.erase(0, received);
return Socket::Status::Success;
}
@ -162,9 +150,4 @@ namespace fr
{
return socket_descriptor;
}
bool TcpSocket::has_data() const
{
return !unprocessed_buffer.empty();
}
}