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zones.go
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/
zones.go
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package aws
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/ec2"
awsutil "github.com/openshift/installer/pkg/asset/installconfig/aws"
)
// AvailabilityZones retrieves a list of availability zones for the given region.
func AvailabilityZones(region string) ([]string, error) {
ec2Client, err := ec2Client(region)
if err != nil {
return nil, err
}
zones, err := fetchAvailabilityZones(ec2Client, region)
if err != nil {
return nil, fmt.Errorf("cannot fetch availability zones: %v", err)
}
return zones, nil
}
func ec2Client(region string) (*ec2.EC2, error) {
ssn, err := awsutil.GetSession()
if err != nil {
return nil, err
}
client := ec2.New(ssn, aws.NewConfig().WithRegion(region))
return client, nil
}
func fetchAvailabilityZones(client *ec2.EC2, region string) ([]string, error) {
req := &ec2.DescribeAvailabilityZonesInput{
Filters: []*ec2.Filter{
{
Name: aws.String("region-name"),
Values: []*string{aws.String(region)},
},
{
Name: aws.String("state"),
Values: []*string{aws.String("available")},
},
},
}
resp, err := client.DescribeAvailabilityZones(req)
if err != nil {
return nil, err
}
zones := []string{}
for _, zone := range resp.AvailabilityZones {
zones = append(zones, *zone.ZoneName)
}
return zones, nil
}