istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/test/framework/components/echo/check/visitor.go (about)

     1  //  Copyright Istio Authors
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  package check
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/hashicorp/go-multierror"
    21  
    22  	echoClient "istio.io/istio/pkg/test/echo"
    23  	"istio.io/istio/pkg/test/framework/components/echo"
    24  	"istio.io/istio/pkg/util/istiomultierror"
    25  )
    26  
    27  // Visitor is performs a partial check operation on a single message.
    28  type Visitor func(echoClient.Response) error
    29  
    30  // Visit is a utility method that just invokes this Visitor function on the given response.
    31  func (v Visitor) Visit(r echoClient.Response) error {
    32  	return v(r)
    33  }
    34  
    35  // And returns a Visitor that performs a logical AND of this Visitor and the one provided.
    36  func (v Visitor) And(o Visitor) Visitor {
    37  	return func(r echoClient.Response) error {
    38  		if err := v(r); err != nil {
    39  			return err
    40  		}
    41  		return o(r)
    42  	}
    43  }
    44  
    45  // Or returns a Visitor that performs a logical OR of this Visitor and the one provided.
    46  func (v Visitor) Or(o Visitor) Visitor {
    47  	return func(r echoClient.Response) error {
    48  		if err := v(r); err != nil {
    49  			return err
    50  		}
    51  		return o(r)
    52  	}
    53  }
    54  
    55  // Checker returns an echo.Checker based on this Visitor.
    56  func (v Visitor) Checker() echo.Checker {
    57  	return func(result echo.CallResult, _ error) error {
    58  		rs := result.Responses
    59  		if rs.IsEmpty() {
    60  			return fmt.Errorf("no responses received")
    61  		}
    62  		outErr := istiomultierror.New()
    63  		for i, r := range rs {
    64  			if err := v.Visit(r); err != nil {
    65  				outErr = multierror.Append(outErr, fmt.Errorf("response[%d]: %v", i, err))
    66  			}
    67  		}
    68  		return outErr.ErrorOrNil()
    69  	}
    70  }