Tidied GDB Connection class and made it adhere to the RAII approach

src/DebugServers/GdbRsp/Connection.cpp

@@ -1,6 +1,6 @@
 #include "Connection.hpp"
 
-#include <sys/socket.h>
+#include <arpa/inet.h>
 #include <sys/epoll.h>
 #include <cerrno>
 #include <fcntl.h>
@@ -19,34 +19,36 @@ namespace Bloom::DebugServers::Gdb
 
     using ResponsePackets::ResponsePacket;
 
-    void Connection::accept(int serverSocketFileDescriptor) {
-        int socketAddressLength = sizeof(this->socketAddress);
-
-        this->socketFileDescriptor = ::accept(
-            serverSocketFileDescriptor,
-            reinterpret_cast<sockaddr*>(&(this->socketAddress)),
-            reinterpret_cast<socklen_t*>(&socketAddressLength)
-        );
-
-        if (this->socketFileDescriptor == -1) {
-            throw Exception("Failed to accept GDB Remote Serial Protocol connection");
-        }
+    Connection::Connection(int serverSocketFileDescriptor, EventNotifier& interruptEventNotifier)
+        : interruptEventNotifier(interruptEventNotifier)
+    {
+        this->accept(serverSocketFileDescriptor);
 
         ::fcntl(
-            this->socketFileDescriptor,
+            this->socketFileDescriptor.value(),
             F_SETFL,
-            ::fcntl(this->socketFileDescriptor, F_GETFL, 0) | O_NONBLOCK
+            ::fcntl(this->socketFileDescriptor.value(), F_GETFL, 0) | O_NONBLOCK
         );
 
-        this->epollInstance.addEntry(this->socketFileDescriptor, static_cast<std::uint16_t>(EpollEvent::READ_READY));
+        this->epollInstance.addEntry(
+            this->socketFileDescriptor.value(),
+            static_cast<std::uint16_t>(EpollEvent::READ_READY)
+        );
         this->enableReadInterrupts();
     }
 
-    void Connection::close() noexcept {
-        if (this->socketFileDescriptor > 0) {
-            ::close(this->socketFileDescriptor);
-            this->socketFileDescriptor = 0;
+    Connection::~Connection() {
+        this->close();
     }
+
+    std::string Connection::getIpAddress() const {
+        std::array<char, INET_ADDRSTRLEN> ipAddress = {};
+
+        if (::inet_ntop(AF_INET, &(socketAddress.sin_addr), ipAddress.data(), INET_ADDRSTRLEN) == nullptr) {
+            throw Exception("Failed to convert client IP address to text form.");
+        }
+
+        return std::string(ipAddress.data());
     }
 
     std::vector<RawPacketType> Connection::readRawPackets() {
@@ -145,6 +147,29 @@ namespace Bloom::DebugServers::Gdb
         } while (this->readSingleByte(false).value_or(0) != '+');
     }
 
+    void Connection::accept(int serverSocketFileDescriptor) {
+        int socketAddressLength = sizeof(this->socketAddress);
+
+        const auto socketFileDescriptor = ::accept(
+            serverSocketFileDescriptor,
+            reinterpret_cast<sockaddr*>(&(this->socketAddress)),
+            reinterpret_cast<socklen_t*>(&socketAddressLength)
+        );
+
+        if (socketFileDescriptor < 0) {
+            throw Exception("Failed to accept GDB Remote Serial Protocol connection");
+        }
+
+        this->socketFileDescriptor = socketFileDescriptor;
+    }
+
+    void Connection::close() noexcept {
+        if (this->socketFileDescriptor.value_or(-1) >= 0) {
+            ::close(this->socketFileDescriptor.value());
+            this->socketFileDescriptor = std::nullopt;
+        }
+    }
+
     std::vector<unsigned char> Connection::read(
         size_t bytes,
         bool interruptible,
@@ -183,7 +208,7 @@ namespace Bloom::DebugServers::Gdb
         size_t bytesToRead = (bytes > bufferSize || bytes == 0) ? bufferSize : bytes;
         while (
             bytesToRead > 0
-            && (bytesRead = ::read(this->socketFileDescriptor, buffer.data(), bytesToRead)) > 0
+            && (bytesRead = ::read(this->socketFileDescriptor.value(), buffer.data(), bytesToRead)) > 0
         ) {
             output.insert(output.end(), buffer.begin(), buffer.begin() + bytesRead);
 
@@ -215,7 +240,7 @@ namespace Bloom::DebugServers::Gdb
 
     void Connection::write(const std::vector<unsigned char>& buffer) {
         Logger::debug("Writing packet: " + std::string(buffer.begin(), buffer.end()));
-        if (::write(this->socketFileDescriptor, buffer.data(), buffer.size()) == -1) {
+        if (::write(this->socketFileDescriptor.value(), buffer.data(), buffer.size()) == -1) {
             if (errno == EPIPE || errno == ECONNRESET) {
                 // Connection was closed
                 throw ClientDisconnected();

src/DebugServers/GdbRsp/Connection.hpp

@@ -1,13 +1,12 @@
 #pragma once
 
+#include <sys/socket.h>
+#include <netinet/in.h>
 #include <cstdint>
 #include <utility>
 #include <vector>
-#include <netinet/in.h>
 #include <queue>
 #include <array>
-#include <sys/socket.h>
-#include <arpa/inet.h>
 #include <chrono>
 
 #include "src/Helpers/EventNotifier.hpp"
@@ -24,47 +23,30 @@ namespace Bloom::DebugServers::Gdb
     class Connection
     {
     public:
-        explicit Connection(EventNotifier& interruptEventNotifier)
-            : interruptEventNotifier(interruptEventNotifier)
-        {};
+        explicit Connection(int serverSocketFileDescriptor, EventNotifier& interruptEventNotifier);
 
         Connection() = delete;
         Connection(const Connection&) = delete;
+        Connection& operator = (Connection&) = delete;
+        Connection& operator = (Connection&&) = delete;
+
         Connection(Connection&& other) noexcept
             : interruptEventNotifier(other.interruptEventNotifier)
             , socketFileDescriptor(other.socketFileDescriptor)
             , epollInstance(std::move(other.epollInstance))
             , readInterruptEnabled(other.readInterruptEnabled)
         {
-            other.socketFileDescriptor = -1;
-        };
+            other.socketFileDescriptor = std::nullopt;
+        }
 
-        /**
-         * Accepts a connection on serverSocketFileDescriptor.
-         *
-         * @param serverSocketFileDescriptor
-         */
-        void accept(int serverSocketFileDescriptor);
-
-        /**
-         * Closes the connection with the client.
-         */
-        void close() noexcept;
+        ~Connection();
 
         /**
          * Obtains the human readable IP address of the connected client.
          *
          * @return
          */
-        std::string getIpAddress() {
-            std::array<char, INET_ADDRSTRLEN> ipAddress = {};
-
-            if (::inet_ntop(AF_INET, &(socketAddress.sin_addr), ipAddress.data(), INET_ADDRSTRLEN) == nullptr) {
-                throw Exceptions::Exception("Failed to convert client IP address to text form.");
-            }
-
-            return std::string(ipAddress.data());
-        };
+        [[nodiscard]] std::string getIpAddress() const;
 
         /**
          * Waits for incoming data from the client and returns the raw GDB packets.
@@ -85,7 +67,7 @@ namespace Bloom::DebugServers::Gdb
         }
 
     private:
-        int socketFileDescriptor = -1;
+        std::optional<int> socketFileDescriptor;
 
         EpollInstance epollInstance = EpollInstance();
 
@@ -99,6 +81,18 @@ namespace Bloom::DebugServers::Gdb
         EventNotifier& interruptEventNotifier;
         bool readInterruptEnabled = false;
 
+        /**
+         * Accepts a connection on serverSocketFileDescriptor.
+         *
+         * @param serverSocketFileDescriptor
+         */
+        void accept(int serverSocketFileDescriptor);
+
+        /**
+         * Closes the connection with the client.
+         */
+        void close() noexcept;
+
         /**
          * Reads data from the client into a raw buffer.
          *

src/DebugServers/GdbRsp/DebugSession.cpp

@@ -10,6 +10,6 @@ namespace Bloom::DebugServers::Gdb
     {}
 
     void DebugSession::terminate() {
-        this->connection.close();
+
     }
 }

src/DebugServers/GdbRsp/GdbRspDebugServer.cpp

@@ -134,7 +134,6 @@ namespace Bloom::DebugServers::Gdb
                     return;
                 }
 
-                connection->accept(this->serverSocketFileDescriptor);
                 Logger::info("Accepted GDP RSP connection from " + connection->getIpAddress());
 
                 this->activeDebugSession.emplace(
@@ -206,7 +205,7 @@ namespace Bloom::DebugServers::Gdb
             return std::nullopt;
         }
 
-        return std::make_optional<Connection>(*(this->interruptEventNotifier));
+        return std::make_optional<Connection>(this->serverSocketFileDescriptor, *(this->interruptEventNotifier));
     }
 
     std::unique_ptr<CommandPacket> GdbRspDebugServer::waitForCommandPacket() {