Merge pull request #122 from ekristen/rebuy-elbv2-listenerrule

feat: add elbv2-listenerrule resource

go.mod

@@ -4,7 +4,7 @@ go 1.21.6
 
 require (
 	github.com/aws/aws-sdk-go v1.50.24
-	github.com/ekristen/libnuke v0.11.0
+	github.com/ekristen/libnuke v0.12.0
 	github.com/fatih/color v1.16.0
 	github.com/golang/mock v1.6.0
 	github.com/google/uuid v1.6.0

go.sum

@@ -8,6 +8,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/ekristen/libnuke v0.11.0 h1:SdSaAVnuAdGDqNlV82uAa+2FD9NeQyH96rIMduheh6o=
 github.com/ekristen/libnuke v0.11.0/go.mod h1:sBdA04l9IMMejQw5gO9k6o/a0GffSYhgZYaUSdRjIac=
+github.com/ekristen/libnuke v0.12.0 h1:Dsk+ckT9sh9QZTLq5m8kOA1KFJGJxSv0TLnfe3YeL1o=
+github.com/ekristen/libnuke v0.12.0/go.mod h1:sBdA04l9IMMejQw5gO9k6o/a0GffSYhgZYaUSdRjIac=
 github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
 github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
 github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=

resources/elbv2-listenerrule.go

@@ -0,0 +1,158 @@
+package resources
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/aws/aws-sdk-go/service/elbv2"
+
+	"github.com/ekristen/libnuke/pkg/registry"
+	"github.com/ekristen/libnuke/pkg/resource"
+	"github.com/ekristen/libnuke/pkg/slices"
+	"github.com/ekristen/libnuke/pkg/types"
+
+	"github.com/ekristen/aws-nuke/pkg/nuke"
+)
+
+var elbv2ListenerRulePageSize int64 = 400 // AWS has a limit of 100 rules per listener
+
+const ELBv2ListenerRuleResource = "ELBv2ListenerRule"
+
+func init() {
+	registry.Register(&registry.Registration{
+		Name:   ELBv2ListenerRuleResource,
+		Scope:  nuke.Account,
+		Lister: &ELBv2ListenerRuleLister{},
+	})
+}
+
+type ELBv2ListenerRuleLister struct{}
+
+func (l *ELBv2ListenerRuleLister) List(_ context.Context, o interface{}) ([]resource.Resource, error) {
+	opts := o.(*nuke.ListerOpts)
+
+	svc := elbv2.New(opts.Session)
+
+	// We need to retrieve ELBs then Listeners then Rules
+	lbs := make([]*elbv2.LoadBalancer, 0)
+	err := svc.DescribeLoadBalancersPages(
+		nil,
+		func(page *elbv2.DescribeLoadBalancersOutput, lastPage bool) bool {
+			lbs = append(lbs, page.LoadBalancers...)
+
+			return !lastPage
+		},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// Required for batched tag retrieval later
+	ruleArns := make([]*string, 0)
+	ruleArnToResource := make(map[string]*ELBv2ListenerRule)
+
+	resources := make([]resource.Resource, 0)
+	for _, lb := range lbs {
+		err := svc.DescribeListenersPages(
+			&elbv2.DescribeListenersInput{
+				LoadBalancerArn: lb.LoadBalancerArn,
+			},
+			func(page *elbv2.DescribeListenersOutput, lastPage bool) bool {
+				for _, listener := range page.Listeners {
+					rules, err := svc.DescribeRules(&elbv2.DescribeRulesInput{
+						ListenerArn: listener.ListenerArn,
+						PageSize:    &elbv2ListenerRulePageSize,
+					})
+					if err == nil {
+						for _, rule := range rules.Rules {
+							// Skip default rules as they cannot be deleted
+							if rule.IsDefault != nil && *rule.IsDefault {
+								continue
+							}
+
+							listenerRule := &ELBv2ListenerRule{
+								svc:         svc,
+								ruleArn:     rule.RuleArn,
+								lbName:      lb.LoadBalancerName,
+								listenerArn: listener.ListenerArn,
+							}
+
+							ruleArns = append(ruleArns, rule.RuleArn)
+							resources = append(resources, listenerRule)
+							ruleArnToResource[*rule.RuleArn] = listenerRule
+						}
+					} else {
+						logrus.
+							WithError(err).
+							WithField("listenerArn", listener.ListenerArn).
+							Error("Failed to list listener rules for listener")
+					}
+				}
+
+				return !lastPage
+			},
+		)
+		if err != nil {
+			logrus.
+				WithError(err).
+				WithField("loadBalancerArn", lb.LoadBalancerArn).
+				Error("Failed to list listeners for load balancer")
+		}
+	}
+
+	// Tags for Rules need to be fetched separately. We can only specify up to 20 in a single call.
+	// See: https://github.com/aws/aws-sdk-go/blob/0e8c61841163762f870f6976775800ded4a789b0/service/elbv2/api.go#L5398
+	for _, ruleChunk := range slices.Chunk(ruleArns, 20) {
+		tagResp, err := svc.DescribeTags(&elbv2.DescribeTagsInput{
+			ResourceArns: ruleChunk,
+		})
+		if err != nil {
+			return nil, err
+		}
+		for _, elbv2TagInfo := range tagResp.TagDescriptions {
+			rule := ruleArnToResource[*elbv2TagInfo.ResourceArn]
+			rule.tags = elbv2TagInfo.Tags
+		}
+	}
+
+	return resources, nil
+}
+
+type ELBv2ListenerRule struct {
+	svc         *elbv2.ELBV2
+	ruleArn     *string
+	lbName      *string
+	listenerArn *string
+	tags        []*elbv2.Tag
+}
+
+func (e *ELBv2ListenerRule) Remove(_ context.Context) error {
+	_, err := e.svc.DeleteRule(&elbv2.DeleteRuleInput{
+		RuleArn: e.ruleArn,
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (e *ELBv2ListenerRule) Properties() types.Properties {
+	properties := types.NewProperties()
+
+	properties.Set("ARN", e.ruleArn)
+	properties.Set("ListenerARN", e.listenerArn)
+	properties.Set("LoadBalancerName", e.lbName)
+
+	for _, tagValue := range e.tags {
+		properties.SetTag(tagValue.Key, tagValue.Value)
+	}
+
+	return properties
+}
+
+func (e *ELBv2ListenerRule) String() string {
+	return fmt.Sprintf("%s -> %s", *e.lbName, *e.ruleArn)
+}