fully implement tcp and udp send and recv of packet types

include/Network.h

@@ -28,11 +28,11 @@ struct Client {
     ClientID id;
     bmp::State state;
 
-    Packet tcp_read(boost::system::error_code& ec);
-    void tcp_write(const Packet& packet, boost::system::error_code& ec);
-    void tcp_write_file_raw(const std::filesystem::path& path, boost::system::error_code& ec);
-    Packet udp_read(boost::system::error_code& ec, ip::udp::socket& socket);
-    void udp_write(const Packet& packet, ip::udp::socket& socket, boost::system::error_code& ec);
+    Packet tcp_read();
+    void tcp_write(const Packet& packet);
+    void tcp_write_file_raw(const std::filesystem::path& path);
+    Packet udp_read(ip::udp::socket& socket);
+    void udp_write(const Packet& packet, ip::udp::socket& socket);
 
     Client(ip::udp::endpoint& ep, ip::tcp::socket&& socket);
     ~Client();

src/Network.cpp

@@ -1,13 +1,33 @@
 #include "Network.h"
 #include "Common.h"
+#include "Environment.h"
 
-Packet Client::tcp_read(boost::system::error_code& ec) {
+#if defined(BEAMMP_LINUX)
+#include <cstring>
+#include <errno.h>
+#include <sys/sendfile.h>
+#include <unistd.h>
+#elif defined(BEAMMP_WINDOWS)
+#else
+#include <boost/iostreams/device/mapped_file.hpp>
+#endif
+
+Packet Client::tcp_read() {
     std::unique_lock lock(m_tcp_read_mtx);
-    return Packet();
-    // CONTINUE
+    Packet packet{};
+    std::vector<uint8_t> header_buffer(bmp::Header::SERIALIZED_SIZE);
+    read(m_tcp_socket, buffer(header_buffer));
+    bmp::Header hdr{};
+    hdr.deserialize_from(header_buffer);
+    // vector eaten up by now, recv again
+    packet.data.resize(hdr.size);
+    read(m_tcp_socket, buffer(packet.data));
+    packet.purpose = hdr.purpose;
+    packet.flags = hdr.flags;
+    return packet;
 }
 
-void Client::tcp_write(const Packet& packet, boost::system::error_code& ec) {
+void Client::tcp_write(const Packet& packet) {
     std::unique_lock lock(m_tcp_write_mtx);
     auto header = packet.header();
     std::vector<uint8_t> header_data(bmp::Header::SERIALIZED_SIZE);
@@ -15,35 +35,31 @@ void Client::tcp_write(const Packet& packet, boost::system::error_code& ec) {
         beammp_errorf("Flags are not implemented");
     }
     header.serialize_to(header_data);
-    write(m_tcp_socket, buffer(header_data), ec);
-    if (!ec) {
-        write(m_tcp_socket, buffer(packet.data), ec);
-    }
+    write(m_tcp_socket, buffer(header_data));
+    write(m_tcp_socket, buffer(packet.data));
 }
 
-Packet Client::udp_read(boost::system::error_code& ec, ip::udp::socket& socket) {
+Packet Client::udp_read(ip::udp::socket& socket) {
     // maximum we can ever expect from udp
     static thread_local std::vector<uint8_t> s_buffer(std::numeric_limits<uint16_t>::max());
     std::unique_lock lock(m_udp_read_mtx);
-    socket.receive_from(buffer(s_buffer),m_udp_ep, {}, ec);
-    if (!ec) {
-        Packet packet;
-        bmp::Header header{};
-        auto offset = header.deserialize_from(s_buffer);
-        if (header.flags != bmp::Flags::None) {
-            beammp_errorf("Flags are not implemented");
-            return {};
-        }
+    socket.receive_from(buffer(s_buffer), m_udp_ep, {});
+    Packet packet;
+    bmp::Header header {};
+    auto offset = header.deserialize_from(s_buffer);
+    if (header.flags != bmp::Flags::None) {
+        beammp_errorf("Flags are not implemented");
+        return {};
     }
-    return {};
+    return packet;
 }
 
-void Client::udp_write(const Packet& packet, ip::udp::socket& socket, boost::system::error_code& ec) {
+void Client::udp_write(const Packet& packet, ip::udp::socket& socket) {
     auto header = packet.header();
     std::vector<uint8_t> data(header.size + bmp::Header::SERIALIZED_SIZE);
     auto offset = header.serialize_to(data);
     std::copy(packet.data.begin(), packet.data.end(), data.begin() + static_cast<long>(offset));
-    socket.send_to(buffer(data), m_udp_ep, {}, ec);
+    socket.send_to(buffer(data), m_udp_ep, {});
 }
 
 Client::~Client() {
@@ -54,10 +70,26 @@ Client::Client(ip::udp::endpoint& ep, ip::tcp::socket&& socket)
     : m_udp_ep(ep)
     , m_tcp_socket(std::forward<ip::tcp::socket&&>(socket)) {
 }
-void Client::tcp_write_file_raw(const std::filesystem::path& path, boost::system::error_code& ec) {
+void Client::tcp_write_file_raw(const std::filesystem::path& path) {
 #if defined(BEAMMP_LINUX)
-#elif defined(BEAMMP_WINDOWS)
+    // sendfile
+    auto size = std::filesystem::file_size(path);
+    auto in_fd = ::open(path.generic_string().c_str(), O_RDONLY);
+    if (in_fd == -1) {
+        throw std::runtime_error(fmt::format("IO error opening '{}': {}", path.generic_string(), std::strerror(errno)));
+    }
+    int out_fd = m_tcp_socket.native_handle();
+    auto n = sendfile(out_fd, in_fd, nullptr /* offset */, size);
+    ::close(in_fd);
+    if (n == -1) {
+        throw std::runtime_error(fmt::format("Failed sending '{}' to client via sendfile(): {}", path.generic_string(), std::strerror(errno)));
+    }
 #else
+    // TODO: Use TransmitFile on Windows for better performance
+    // primitive implementation using a memory-mapped file
+    boost::iostreams::mapped_file f(path.generic_string(), boost::iostreams::mapped_file::mapmode::readonly);
+    std::unique_lock lock(m_tcp_write_mtx);
+    write(m_tcp_socket, buffer(f.data(), f.size()));
 #endif
 }
 bmp::Header Packet::header() const {