Hare by Example: TCP Client

TCP is also doable in Hare, but given the nature of TCP it is a bit more involved to set up and manage.

use fmt;
use net;
use net::tcp;
use net::ip;
use strings;
use io;

export fn main() void = {
	// Parse an address we want to connect to.
	const addr = ip::parse("0.0.0.0")!;

	// Create a tcp connection to that address and port.
	const conn = tcp::connect(addr, 9000)!;

	// Since tcp is persisted as a stream we need to make sure we
	// close our connection when finished to free up the resources.
	defer net::close(conn)!;

	// Create a message to send over the connection.
	const msg = strings::toutf8("Hello, from TCP Hare client!");

	// Again, since this tcp connection is stream-based we can use
	// the io modile to read and write data to it.
	const sz = io::write(conn, msg)!;
	fmt::printf("Send {} bytes", sz)!;
};

# First, start a tcp listener with netcat
$ nc -l -p 9000
Hello, from TCP Hare client!

# Second, run the example to connect to that tcp listener
$ hare run tcp-client.ha
Send 28 bytes

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