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aws.go
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aws.go
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package metadata
import (
"context"
"encoding/json"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/feature/ec2/imds"
"io"
"k8s.io/klog/v2"
)
func getAwsMetadata() *CloudMetadata {
ctx, cancel := context.WithTimeout(context.Background(), metadataServiceTimeout)
defer cancel()
cfg, err := config.LoadDefaultConfig(ctx)
if err != nil {
klog.Errorln(err)
return nil
}
c := imds.NewFromConfig(cfg)
md := &CloudMetadata{
Provider: CloudProviderAWS,
InstanceId: getAwsMetadataVariable(ctx, c, "instance-id"),
LifeCycle: getAwsMetadataVariable(ctx, c, "instance-life-cycle"),
InstanceType: getAwsMetadataVariable(ctx, c, "instance-type"),
Region: getAwsMetadataVariable(ctx, c, "placement/region"),
AvailabilityZone: getAwsMetadataVariable(ctx, c, "placement/availability-zone"),
AvailabilityZoneId: getAwsMetadataVariable(ctx, c, "placement/availability-zone-id"),
LocalIPv4: getAwsMetadataVariable(ctx, c, "local-ipv4"),
PublicIPv4: getAwsMetadataVariable(ctx, c, "public-ipv4"),
}
if infoJson := getAwsMetadataVariable(ctx, c, "identity-credentials/ec2/info"); infoJson != "" {
m := map[string]string{}
if err := json.Unmarshal([]byte(infoJson), &m); err != nil {
klog.Errorln(err)
} else {
md.AccountId = m["AccountId"]
}
}
return md
}
func getAwsMetadataVariable(ctx context.Context, client *imds.Client, path string) string {
res, err := client.GetMetadata(ctx, &imds.GetMetadataInput{Path: path})
if err != nil {
klog.Errorln(path, err)
return ""
}
defer res.Content.Close()
payload, err := io.ReadAll(res.Content)
if err != nil {
klog.Errorln(path, err)
return ""
}
return string(payload)
}