Make core-buffer folder with all common stuff used in the buffer

core-buffer/src/UdpReceiver.cpp

@@ -0,0 +1,91 @@
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <iostream>
+#include "UdpReceiver.hpp"
+
+using namespace std;
+
+UdpReceiver::UdpReceiver() :
+    socket_fd_(-1)
+{
+}
+
+UdpReceiver::~UdpReceiver()
+{
+    close();
+}
+
+void UdpReceiver::bind(const uint16_t port, const size_t usec_timeout)
+{
+    if (socket_fd_ > -1) {
+        throw runtime_error("Socket already bound.");
+    }
+
+    socket_fd_ = socket(AF_INET, SOCK_DGRAM, 0);
+    if (socket_fd_ < 0) {
+        throw runtime_error("Cannot open socket.");
+    }
+
+    #ifdef DEBUG_OUTPUT
+        using namespace date;
+        using namespace chrono;
+        cout << "[" << system_clock::now() << "]";
+        cout << "[UdpReceiver::bind]";
+        cout << " port " << port;
+        cout << " usec_timeout " << usec_timeout << endl;
+    #endif
+
+    sockaddr_in server_address = {0};
+    server_address.sin_family = AF_INET;
+    server_address.sin_addr.s_addr = INADDR_ANY;
+    server_address.sin_port = htons(port);
+
+    auto bind_result = ::bind(
+            socket_fd_,
+            reinterpret_cast<const sockaddr *>(&server_address),
+            sizeof(server_address));
+
+    if (bind_result < 0) {
+        throw runtime_error("Cannot bind socket.");
+    }
+
+    struct timeval udp_socket_timeout;
+    udp_socket_timeout.tv_sec = 0;
+    udp_socket_timeout.tv_usec = usec_timeout;
+
+    setsockopt(
+            socket_fd_,
+            SOL_SOCKET,
+            SO_RCVTIMEO,
+            (const char*)&udp_socket_timeout,
+            sizeof(struct timeval));
+}
+
+bool UdpReceiver::receive(void* buffer, size_t buffer_n_bytes)
+{
+    auto data_len = recv(socket_fd_, buffer, buffer_n_bytes, 0);
+
+    if (data_len < 0) {
+        return false;
+    }
+
+    if (data_len != buffer_n_bytes) {
+        #ifdef DEBUG_OUTPUT
+            using namespace date;
+            using namespace chrono;
+            cout << "[" << system_clock::now() << "]";
+            cout << "[UdpReceiver::receive]";
+            cout << " Expected buffer_n_bytes " << buffer_n_bytes;
+            cout << " but got data_len " << data_len << endl;
+        #endif
+        return false;
+    }
+
+    return true;
+}
+
+void UdpReceiver::close()
+{
+    ::close(socket_fd_);
+    socket_fd_ = -1;
+}