rpc_server progress

runtime/Makefile

@@ -1,6 +1,6 @@
 
 CXX_FLAGS = \
-	-std=c++20 \
+	-std=c++23 \
 	-Og \
 	-fsanitize=address,undefined \
 	-pedantic -pedantic-errors \

runtime/compile_flags.txt

@@ -1,5 +1,5 @@
 -xc++
--std=c++20
+-std=c++23
 -pedantic
 -pedantic-errors
 -Wall

runtime/rpc_server.cpp

@@ -1 +1,84 @@
 #include "rpc_server.hpp"
+#include <sys/socket.h>
+#include <unistd.h>
+
+auto slige_rpc::ClientSocket::Read(
+    uint8_t* buffer, size_t length) -> std::variant<size_t, slige_rpc::Ewwow>
+{
+    ssize_t bytes_read = recv(fd, buffer, length, 0);
+    if (bytes_read < 0) {
+        return Ewwow { .message = "unable to read" };
+    }
+    return (size_t)bytes_read;
+};
+
+auto slige_rpc::ClientSocket::Write(
+    uint8_t* buffer, size_t length) -> std::variant<size_t, slige_rpc::Ewwow>
+{
+    ssize_t bytes_written = send(fd, buffer, length, 0);
+    if (bytes_written < 0) {
+        return Ewwow { .message = "unable to write" };
+    }
+    return (size_t)bytes_written;
+};
+
+auto slige_rpc::Socket::Connect()
+    -> std::variant<ClientSocket, slige_rpc::Ewwow>
+{
+    int socket_fd;
+    if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+        return { Ewwow { .message = "could not get socket" } };
+    }
+    // TODO:
+    // 1) does address (presumably 'socket)
+    //    live as long as child socket ('client)?
+    //    - immediate answer is no
+    // 2) does it need to?
+    if (connect(socket_fd, (struct sockaddr*)&address, sizeof(address)) < 0) {
+        return { Ewwow {
+            .message = "could not connect, is the server running?" } };
+    }
+    return { ClientSocket(socket_fd) };
+}
+
+auto slige_rpc::ServerSocket::Accept()
+    -> std::variant<ClientSocket, slige_rpc::Ewwow>
+{
+    unsigned int address_size = sizeof(address);
+    // TODO:
+    // 1) does address (presumably 'server)
+    //    live as long as child socket ('socket)?
+    //    - immediate answer is no
+    // 2) does it need to?
+    int client = accept(fd, (struct sockaddr*)&address, &address_size);
+    if (client < 0) {
+        return Ewwow { .message = "could not accept" };
+    }
+    return client;
+    return { ClientSocket(client) };
+}
+
+auto slige_rpc::Socket::Bind() -> std::variant<ServerSocket, slige_rpc::Ewwow>
+{
+    int socket_fd;
+    if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+        return { Ewwow { .message = "could not get socket" } };
+    }
+    // TODO:
+    // 1) does address (presumably 'socket)
+    //    live as long as child socket ('server)?
+    //    - immediate answer is no
+    // 2) does it need to?
+    if (bind(socket_fd, (struct sockaddr*)&address, sizeof(address)) < 0) {
+        return { Ewwow { .message = "could not bind" } };
+    }
+
+    if (listen(socket_fd, 0) < 0) {
+        return { Ewwow { .message = "could not listen" } };
+    }
+    // TODO:
+    // 1) does this address get moved, copied or cloned?
+    //    it should be represented as a u32,
+    //    so copying should be fine - but does it?
+    return { ServerSocket(socket_fd, address) };
+}

runtime/rpc_server.hpp

@@ -1,5 +1,13 @@
 #pragma once
 
+#include <arpa/inet.h>
+#include <cstdint>
+#include <netdb.h>
+#include <stdlib.h>
+#include <string>
+#include <unistd.h>
+#include <variant>
+
 namespace slige_rpc {
 
 class RpcServer {
@@ -7,4 +15,60 @@ public:
 private:
 };
 
+struct Ewwow {
+    std::string message;
+};
+
+namespace {
+    class ClientSocket {
+    public:
+        ~ClientSocket() { close(fd); };
+        ClientSocket(int fd)
+            : fd(fd)
+        {
         }
+        auto Read(
+            uint8_t* buffer, size_t length) -> std::variant<size_t, Ewwow>;
+        auto Write(
+            uint8_t* buffer, size_t length) -> std::variant<size_t, Ewwow>;
+
+    private:
+        int fd;
+    };
+
+    class ServerSocket {
+    public:
+        ServerSocket(int fd, sockaddr_in address)
+            : fd(fd)
+            , address(address)
+        {
+        }
+        ~ServerSocket() { close(fd); };
+        auto Accept() -> std::variant<ClientSocket, Ewwow>;
+
+    private:
+        int fd;
+        sockaddr_in address;
+    };
+}
+
+class Socket {
+public:
+    Socket(uint16_t port)
+    {
+        address = {
+            .sin_family = AF_INET,
+            .sin_port = htons(port),
+            .sin_addr = { .s_addr = inet_addr("127.0.0.1") },
+            .sin_zero = { 0 },
+        };
+    }
+
+    auto Connect() -> std::variant<ClientSocket, Ewwow>;
+    auto Bind() -> std::variant<ServerSocket, Ewwow>;
+
+private:
+    sockaddr_in address;
+};
+
+};