sigs.k8s.io/cluster-api-provider-aws@v1.5.5/pkg/cloud/services/instancestate/queue.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 instancestate
    18  
    19  import (
    20  	"encoding/json"
    21  	"fmt"
    22  	"strings"
    23  
    24  	"github.com/aws/aws-sdk-go/aws"
    25  	"github.com/aws/aws-sdk-go/aws/awserr"
    26  	"github.com/aws/aws-sdk-go/service/sqs"
    27  	"github.com/pkg/errors"
    28  
    29  	iamv1 "sigs.k8s.io/cluster-api-provider-aws/iam/api/v1beta1"
    30  )
    31  
    32  func (s *Service) reconcileSQSQueue() error {
    33  	attrs := make(map[string]string)
    34  	attrs[sqs.QueueAttributeNameReceiveMessageWaitTimeSeconds] = "20"
    35  
    36  	_, err := s.SQSClient.CreateQueue(&sqs.CreateQueueInput{
    37  		QueueName:  aws.String(GenerateQueueName(s.scope.Name())),
    38  		Attributes: aws.StringMap(attrs),
    39  	})
    40  
    41  	if err != nil {
    42  		if aerr, ok := err.(awserr.Error); ok {
    43  			if aerr.Code() == sqs.ErrCodeQueueNameExists {
    44  				return nil
    45  			}
    46  		}
    47  	}
    48  	return errors.Wrap(err, "unable to create new queue")
    49  }
    50  
    51  func (s *Service) deleteSQSQueue() error {
    52  	resp, err := s.SQSClient.GetQueueUrl(&sqs.GetQueueUrlInput{QueueName: aws.String(GenerateQueueName(s.scope.Name()))})
    53  	if err != nil {
    54  		if queueNotFoundError(err) {
    55  			return nil
    56  		}
    57  		return errors.Wrap(err, "unable to get queue URL")
    58  	}
    59  	_, err = s.SQSClient.DeleteQueue(&sqs.DeleteQueueInput{QueueUrl: resp.QueueUrl})
    60  	if err != nil && queueNotFoundError(err) {
    61  		return nil
    62  	}
    63  
    64  	return errors.Wrap(err, "unable to delete queue")
    65  }
    66  
    67  func (s *Service) createPolicyForRule(input *createPolicyForRuleInput) error {
    68  	attrs := make(map[string]string)
    69  	policy := iamv1.PolicyDocument{
    70  		Version: iamv1.CurrentVersion,
    71  		ID:      input.QueueArn,
    72  		Statement: iamv1.Statements{
    73  			iamv1.StatementEntry{
    74  				Sid:       fmt.Sprintf("CAPAEvents_%s_%s", s.getEC2RuleName(), GenerateQueueName(s.scope.Name())),
    75  				Effect:    iamv1.EffectAllow,
    76  				Principal: iamv1.Principals{iamv1.PrincipalService: iamv1.PrincipalID{"events.amazonaws.com"}},
    77  				Action:    iamv1.Actions{"sqs:SendMessage"},
    78  				Resource:  iamv1.Resources{input.QueueArn},
    79  				Condition: iamv1.Conditions{
    80  					"ArnEquals": map[string]string{"aws:SourceArn": input.RuleArn},
    81  				},
    82  			},
    83  		},
    84  	}
    85  	policyData, err := json.Marshal(policy)
    86  	if err != nil {
    87  		return errors.Wrap(err, "unable to JSON marshal policy")
    88  	}
    89  	attrs[sqs.QueueAttributeNamePolicy] = string(policyData)
    90  
    91  	_, err = s.SQSClient.SetQueueAttributes(&sqs.SetQueueAttributesInput{
    92  		QueueUrl:   aws.String(input.QueueURL),
    93  		Attributes: aws.StringMap(attrs),
    94  	})
    95  
    96  	return errors.Wrap(err, "unable to update queue attributes")
    97  }
    98  
    99  // GenerateQueueName will generate a queue name.
   100  func GenerateQueueName(clusterName string) string {
   101  	adjusted := strings.ReplaceAll(clusterName, ".", "-")
   102  	return fmt.Sprintf("%s-queue", adjusted)
   103  }
   104  
   105  func queueNotFoundError(err error) bool {
   106  	if aerr, ok := err.(awserr.Error); ok {
   107  		if aerr.Code() == sqs.ErrCodeQueueDoesNotExist {
   108  			return true
   109  		}
   110  	}
   111  	return false
   112  }
   113  
   114  type createPolicyForRuleInput struct {
   115  	QueueArn string
   116  	QueueURL string
   117  	RuleArn  string
   118  }