#pragma once

#include "envoy/config/subscription.h"

namespace Envoy {

namespace Config {

// Represents a collection of config validators defined using Envoy extensions,

// for all xDS service types. This is different than running Envoy in

// "validation-mode", as these config validators will be executed whenever

// Envoy receives a new update.

class CustomConfigValidators {

public:

  /**

   * Executes the validators that receive the State-of-the-World resources.

   *

   * @param type_url the xDS type url of the incoming resources.

   * @param resources the State-of-the-World resources from the new config

   *        update.

   * @throw EnvoyException if the config is rejected by one of the validators.

   */

  virtual void executeValidators(absl::string_view type_url,

                                 const std::vector<DecodedResourcePtr>& resources) PURE;

  /**

   * Executes the validators that receive the Incremental (delta-xDS) resources.

   *

   * @param type_url the xDS type url of the incoming resources.

   * @param added_resources the added/modified resources from the new config

   *        update.

   * @param removed_resources the resources to remove according to the new

   *        config update.

   * @throw EnvoyException if the config is rejected by one of the validators.

   */

  virtual void

  executeValidators(absl::string_view type_url,

                    const std::vector<DecodedResourcePtr>& added_resources,

                    const Protobuf::RepeatedPtrField<std::string>& removed_resources) PURE;

};

using CustomConfigValidatorsPtr = std::unique_ptr<CustomConfigValidators>;

} // namespace Config

} // namespace Envoy