/
selector.go
119 lines (98 loc) · 3 KB
/
selector.go
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package elbv2
import (
"context"
"encoding/json"
"fmt"
"github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2"
"github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2/types"
"github.com/mcastellin/aws-fail-az/awsapis"
"github.com/mcastellin/aws-fail-az/domain"
"github.com/mcastellin/aws-fail-az/service/awsutils"
)
func RestoreElbv2LoadBalancersFromState(stateData []byte, provider awsapis.AWSProvider) error {
var state LoadBalancerState
err := json.Unmarshal(stateData, &state)
if err != nil {
return err
}
resource := LoadBalancer{
Provider: provider,
Name: state.LoadBalancerName,
stateSubnets: state.Subnets,
}
return resource.Restore()
}
func NewElbv2LoadBalancerFaultFromConfig(selector domain.TargetSelector, provider awsapis.AWSProvider) ([]domain.ConsistentStateResource, error) {
if selector.Type != domain.ResourceTypeElbv2LoadBalancer {
return nil, fmt.Errorf("Unable to create LoadBalancer object from selector of type %s.", selector.Type)
}
var lbNames []string
var err error
err = selector.Validate()
if err != nil {
return nil, err
}
attributes, err := awsutils.TokenizeResourceFilter(selector.Filter, []string{"name"})
if err != nil {
return nil, err
}
if len(attributes) == 1 {
lbNames = []string{attributes["name"]}
} else if len(selector.Tags) > 0 {
api := provider.NewElbV2Api()
lbNames, err = filterLoadBalancersByTag(api, selector.Tags)
if err != nil {
return nil, err
}
}
objs := make([]domain.ConsistentStateResource, len(lbNames))
for idx := range lbNames {
objs[idx] = &LoadBalancer{
Provider: provider,
Name: lbNames[idx],
}
}
return objs, nil
}
func filterLoadBalancersByTag(api awsapis.ElbV2Api, tags []domain.AWSTag) ([]string, error) {
lbNames := []string{}
paginator := api.NewDescribeLoadBalancersPaginator(
&elasticloadbalancingv2.DescribeLoadBalancersInput{})
for paginator.HasMorePages() {
response, err := paginator.NextPage(context.TODO())
if err != nil {
return nil, err
}
if len(response.LoadBalancers) == 0 {
continue
}
resourceArns := make([]string, len(response.LoadBalancers))
for idx, lb := range response.LoadBalancers {
resourceArns[idx] = *lb.LoadBalancerArn
}
describeTagsOutput, err := api.DescribeTags(context.TODO(),
&elasticloadbalancingv2.DescribeTagsInput{ResourceArns: resourceArns})
if err != nil {
return nil, err
}
for _, descriptor := range describeTagsOutput.TagDescriptions {
if resourceTagsMatchFilters(descriptor, tags) {
lbNames = append(lbNames, *descriptor.ResourceArn)
}
}
}
return lbNames, nil
}
func resourceTagsMatchFilters(tagDescriptor types.TagDescription, filterTags []domain.AWSTag) bool {
allMatch := len(tagDescriptor.Tags) >= len(filterTags)
for _, filterTag := range filterTags {
match := false
for _, resourceTag := range tagDescriptor.Tags {
if *resourceTag.Key == filterTag.Name && *resourceTag.Value == filterTag.Value {
match = true
}
}
allMatch = allMatch && match
}
return allMatch
}