/++
   #1 of the "primitive networking servers series". A serial (non-concurrent)
   TCP server that just greets any connections with  "Hello, world!" before
   closing them.
 +/
module hello;

import std.socket : InternetAddress, Socket, TcpSocket, SocketOptionLevel, SocketOption;
import std.stdio : writefln;

enum port = 4444;

void main() {
    TcpSocket listener = new TcpSocket;
    listener.setOption(SocketOptionLevel.SOCKET, SocketOption.REUSEADDR, 1);
    listener.bind(new InternetAddress(port));
    listener.listen(10);
    writefln!"Listening on %d."(port);

    while (true) {
        Socket client = listener.accept;
        writefln!"Received connection from %s."(client.remoteAddress.toString);
        client.send("Hello, world!\n");
        client.close;
    }
}