import io
import net

// This file shows how a basic TCP echo server can be implemented using
// the net module. You can connect to the server by using netcat or telnet,
// in separate shells, for example:
// nc 127.0.0.1 12345
// or
// telnet 127.0.0.1 12345

fn main() {
    mut server := net.listen_tcp(.ip6, ':12345')!
    laddr := server.addr()!
    eprintln('Listen on ${laddr} ...')
    for {
        mut socket := server.accept()!
        spawn handle_client(mut socket)
    }
}

fn handle_client(mut socket net.TcpConn) {
    defer {
        socket.close() or { panic(err) }
    }
    client_addr := socket.peer_addr() or { return }
    eprintln('> new client: ${client_addr}')
    mut reader := io.new_buffered_reader(reader: socket)
    defer {
        unsafe {
            reader.free()
        }
    }
    socket.write_string('server: hello\n') or { return }
    for {
        received_line := reader.read_line() or { return }
        if received_line == '' {
            return
        }
        println('client ${client_addr}: ${received_line}')
        socket.write_string('server: ${received_line}\n') or { return }
    }
}