//  Copyright Istio Authors
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

package echo

var noChecker Checker = func(_ CallResult, err error) error {
	return err
}

// Checker inspects echo call results for errors.
type Checker func(CallResult, error) error

func (c Checker) Check(result CallResult, err error) error {
	return c(result, err)
}

// NoChecker provides a Checker that returns the original raw call error, unaltered.
func NoChecker() Checker {
	return noChecker
}
