Aerys\Server::negotiateCrypto PHP Method

    private function negotiateCrypto(string $watcherId, $socket, $peer)
    {
        list($ip, $port) = $peer;
        if ($handshake = @\stream_socket_enable_crypto($socket, true)) {
            $socketId = (int) $socket;
            \Amp\cancel($watcherId);
            unset($this->pendingTlsStreams[$socketId]);
            assert((function () use($socket, $ip, $port) {
                $meta = stream_get_meta_data($socket)["crypto"];
                $isH2 = isset($meta["alpn_protocol"]) && $meta["alpn_protocol"] === "h2";
                return $this->logDebug(sprintf("crypto negotiated %s%s:%d", $isH2 ? "(h2) " : "", $ip, $port));
            })());
            // Dispatch via HTTP 1 driver; it knows how to handle PRI * requests - for now it is easier to dispatch only via content (ignore alpn)...
            $this->importClient($socket, $ip, $port);
        } elseif ($handshake === false) {
            assert($this->logDebug("crypto handshake error {$ip}:{$port}"));
            $this->failCryptoNegotiation($socket, $ip);
        }
    }