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metadata.go
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metadata.go
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package metadata
import (
"fmt"
"k8s.io/klog/v2"
"net/http"
"os"
"strings"
"time"
)
const metadataServiceTimeout = 5 * time.Second
type CloudProvider string
const (
CloudProviderAWS CloudProvider = "AWS"
CloudProviderGCP CloudProvider = "GCP"
CloudProviderAzure CloudProvider = "Azure"
CloudProviderHetzner CloudProvider = "Hetzner"
CloudProviderUnknown CloudProvider = ""
)
type CloudMetadata struct {
Provider CloudProvider
AccountId string
InstanceId string
InstanceType string
LifeCycle string
Region string
AvailabilityZone string
AvailabilityZoneId string
LocalIPv4 string
PublicIPv4 string
}
func getCloudProvider() CloudProvider {
if d, err := os.ReadFile("/sys/hypervisor/uuid"); err == nil { // AWS Xen instances
if strings.HasPrefix(strings.ToLower(string(d)), "ec2") {
return CloudProviderAWS
}
}
if vendor, err := os.ReadFile("/sys/class/dmi/id/board_vendor"); err == nil {
switch strings.TrimSpace(string(vendor)) {
case "Amazon EC2":
return CloudProviderAWS
case "Google":
return CloudProviderGCP
case "Microsoft Corporation":
return CloudProviderAzure
}
}
if vendor, err := os.ReadFile("/sys/class/dmi/id/sys_vendor"); err == nil {
if strings.TrimSpace(string(vendor)) == "Hetzner" {
return CloudProviderHetzner
}
}
return CloudProviderUnknown
}
func GetInstanceMetadata() *CloudMetadata {
provider := getCloudProvider()
klog.Infoln("cloud provider:", provider)
switch provider {
case CloudProviderAWS:
return getAwsMetadata()
case CloudProviderGCP:
return getGcpMetadata()
case CloudProviderAzure:
return getAzureMetadata()
case CloudProviderHetzner:
return getHetznerMetadata()
}
return nil
}
func httpGetWithTimeout(r *http.Request) (*http.Response, error) {
client := http.DefaultClient
client.Timeout = metadataServiceTimeout
resp, err := client.Do(r)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
klog.Errorln()
return nil, fmt.Errorf("metadata service response: %s", resp.Status)
}
return resp, nil
}