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aws.go
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aws.go
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package aws
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/aws/aws-sdk-go/service/ec2"
)
type awsCloud struct {
ec2 *ec2.EC2
asg *autoscaling.AutoScaling
}
func newAWSCloud(regionName string) (*awsCloud, error) {
creds := credentials.NewChainCredentials([]credentials.Provider{
&credentials.EnvProvider{},
&credentials.SharedCredentialsProvider{},
&ec2rolecreds.EC2RoleProvider{
Client: ec2metadata.New(session.New(&aws.Config{})),
},
})
if regionName == "" {
mc := ec2metadata.New(session.New(&aws.Config{}))
zone, err := mc.GetMetadata("placement/availability-zone")
if err != nil {
return nil, err
}
regionName, err = azToRegion(zone)
if err != nil {
return nil, err
}
}
awsConfig := &aws.Config{
Region: ®ionName,
Credentials: creds,
}
awsConfig = awsConfig.WithCredentialsChainVerboseErrors(true)
ec2 := ec2.New(session.New(awsConfig))
asg := autoscaling.New(session.New(awsConfig))
return &awsCloud{
ec2: ec2,
asg: asg,
}, nil
}
func (c *awsCloud) instanceID(nodeName string) (string, error) {
privateDNSName := nodeName
filters := []*ec2.Filter{
newEC2Filter("private-dns-name", privateDNSName),
newEC2Filter("instance-state-name", "running"),
}
req := &ec2.DescribeInstancesInput{
Filters: filters,
}
instances, err := c.describeInstances(req)
if err != nil {
return "", err
}
if len(instances) == 0 {
return "", fmt.Errorf("no instance found for %s", nodeName)
}
if len(instances) > 1 {
return "", fmt.Errorf("multiple instances found for name: %s", nodeName)
}
return aws.StringValue(instances[0].InstanceId), nil
}
func (c *awsCloud) autoScalingGroupID(nodeName string) (string, error) {
instanceID, err := c.instanceID(nodeName)
if err != nil {
return "", err
}
if instanceID == "" {
return "", fmt.Errorf("error got empty instance id from aws")
}
reqASI := &autoscaling.DescribeAutoScalingInstancesInput{
InstanceIds: []*string{
aws.String(instanceID),
},
}
instances, err := c.describeAutoScalingInstances(reqASI)
if err != nil {
return "", err
}
if len(instances) == 0 {
return "", fmt.Errorf("error no instance group found for %s", nodeName)
}
if len(instances) > 1 {
return "", fmt.Errorf("multiple auto scaling instances found for name: %s", nodeName)
}
return aws.StringValue(instances[0].AutoScalingGroupName), nil
}
func (c *awsCloud) describeInstances(request *ec2.DescribeInstancesInput) ([]*ec2.Instance, error) {
// Instances are paged
results := []*ec2.Instance{}
var nextToken *string
for {
response, err := c.ec2.DescribeInstances(request)
if err != nil {
return nil, fmt.Errorf("error listing AWS instances: %q", err)
}
for _, reservation := range response.Reservations {
results = append(results, reservation.Instances...)
}
nextToken = response.NextToken
if aws.StringValue(nextToken) == "" {
break
}
request.NextToken = nextToken
}
return results, nil
}
func (c *awsCloud) describeAutoScalingInstances(request *autoscaling.DescribeAutoScalingInstancesInput) ([]*autoscaling.InstanceDetails, error) {
results := []*autoscaling.InstanceDetails{}
var nextToken *string
for {
response, err := c.asg.DescribeAutoScalingInstances(request)
if err != nil {
return nil, fmt.Errorf("error listing AS instances: %q", err)
}
results = append(results, response.AutoScalingInstances...)
nextToken = response.NextToken
if aws.StringValue(nextToken) == "" {
break
}
request.NextToken = nextToken
}
return results, nil
}
// Derives the region from a valid az name.
// Returns an error if the az is known invalid (empty)
func azToRegion(az string) (string, error) {
if len(az) < 1 {
return "", fmt.Errorf("invalid (empty) AZ")
}
region := az[:len(az)-1]
return region, nil
}
func newEC2Filter(name string, values ...string) *ec2.Filter {
filter := &ec2.Filter{
Name: aws.String(name),
}
for _, value := range values {
filter.Values = append(filter.Values, aws.String(value))
}
return filter
}