working commit

works/rpcvar/tcpclient.cpp

@@ -0,0 +1,96 @@
+extern "C" {
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+}
+
+#include <expected>
+#include <string>
+#include <vector>
+#include <span>
+#include <iostream>
+
+#include <cstring>
+#include <expected>
+#include <string>
+#include <iostream>
+
+
+#include <tcpclient.hpp>
+
+TCPClient::TCPClient() {
+        sock = 0;
+        family = 0;
+}
+
+std::expected<void, std::string> TCPClient::Connect(const std::string naddress, const int port) {
+
+        struct sockaddr_in sa;
+        if (inet_pton(AF_INET, naddress.c_str(), &(sa.sin_addr)) == 1) {
+                family = AF_INET;
+        } else if (inet_pton(AF_INET6, naddress.c_str(), &(sa.sin_addr)) == 1) {
+                family = AF_INET6;
+        } else {
+                int errnocopy = errno;
+                std::string error = std::strerror(errnocopy);
+                return std::unexpected("Incorrect address " + naddress);
+        }
+
+        sock = socket(family, SOCK_STREAM, 0);
+        if (sock < 0) {
+                return std::unexpected("Error opening socket");
+        }
+        struct sockaddr_in serv_addr;
+        memset(&serv_addr, 0, sizeof(serv_addr));
+
+        serv_addr.sin_family = AF_INET;
+        serv_addr.sin_port = htons(port);
+        const char* addr = naddress.data();
+        if (inet_pton(AF_INET, addr, &serv_addr.sin_addr) <= 0) {
+                return std::unexpected("Invalid server IP address");
+        }
+
+        struct timeval timeout;
+        timeout.tv_sec = 5;
+        timeout.tv_usec = 0;
+
+        if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout) < 0) {
+                return std::unexpected("Set timeout error");
+        }
+        if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof timeout) < 0) {
+                return std::unexpected("Set timeout error");
+        }
+        if (connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
+                return std::unexpected("Connecting error");
+        }
+        return {};
+}
+
+std::expected<int, std::string> TCPClient::Write(std::string payload) {
+        int n = 0;
+        if ((n = write(sock, payload.data(), payload.size())) < 0) {
+                return std::unexpected("Write error");
+        }
+        return n;
+}
+
+std::expected<int, std::string> TCPClient::Read(std::string& res, int size) {
+        char buffer[size + 1];
+        memset(&buffer, 0, size + 1);
+        int rsize = 0;
+        if ((rsize = read(sock, &buffer, size)) < 0) {
+                return std::unexpected("Read error");
+        }
+        res.append(buffer, rsize);
+        return rsize;
+}
+
+TCPClient::~TCPClient() {
+        close(sock);
+}
+