A simple tcp echo server written in the V programming language.

tcp_echo_server.v

import net
// Connect with: `nc 127.0.0.1 12345`
fn handle_connection(con net.Socket) {
	eprintln('new client connected')
	defer {	eprintln('closing connection: $con') con.close() or { } }
	con.send_string("Welcome to V's TCP Echo server.\n") or { return }
	for {
		line := con.read_line()
		if line.len == 0 { return }
		eprintln('received line: ' + line.trim_space())
		con.send_string(line) or { return }
	}
}

fn main() {
	server_port := 12345
	eprintln('Starting an echo server, listening on port: $server_port')
	server := net.listen(server_port) or { panic(err) }
	for {
		con := server.accept() or { server.close() or { } panic(err) }
		go handle_connection(con)
	}
}