#pragma once

#include "envoy/network/address.h"

#include "absl/types/optional.h"

namespace Envoy {

namespace Udp {

/**

 * Hash policy for UDP transport layer protocol.

 */

class HashPolicy {

public:

  /**

   * @param downstream_address is the address of the peer client.

   * @return absl::optional<uint64_t> an optional hash value to route on. A hash value might not be

   * returned if for example the downstream address has a unix domain socket type.

   */

  virtual absl::optional<uint64_t>

  generateHash(const Network::Address::Instance& downstream_address) const PURE;

};

} // namespace Udp

} // namespace Envoy