sigs.k8s.io/cluster-api-provider-aws@v1.5.5/pkg/eks/eks.go (about)

     1  /*
     2  Copyright 2020 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  	http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package eks
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  
    23  	"github.com/pkg/errors"
    24  
    25  	"sigs.k8s.io/cluster-api-provider-aws/pkg/hash"
    26  )
    27  
    28  const (
    29  	resourcePrefix = "capa_"
    30  )
    31  
    32  // GenerateEKSName generates a name of an EKS resources.
    33  func GenerateEKSName(resourceName, namespace string, maxLength int) (string, error) {
    34  	escapedName := strings.ReplaceAll(resourceName, ".", "_")
    35  	eksName := fmt.Sprintf("%s_%s", namespace, escapedName)
    36  
    37  	if len(eksName) < maxLength {
    38  		return eksName, nil
    39  	}
    40  
    41  	hashLength := 32 - len(resourcePrefix)
    42  	hashedName, err := hash.Base36TruncatedHash(eksName, hashLength)
    43  	if err != nil {
    44  		return "", errors.Wrap(err, "creating hash from name")
    45  	}
    46  
    47  	return fmt.Sprintf("%s%s", resourcePrefix, hashedName), nil
    48  }