/
metadata.go
77 lines (66 loc) · 2.33 KB
/
metadata.go
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// Copyright 2020 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"time"
)
const (
metadataURL = "http://169.254.169.254/metadata"
// current version of the metadata/instance service
metadataAPIVersion = "2019-06-01"
)
// GetSubscriptionID retrieves the Azure subscriptionID from the Azure Instance Metadata Service
func GetSubscriptionID(ctx context.Context) (string, error) {
return getMetadataString(ctx, "instance/compute/subscriptionId")
}
// GetResourceGroupName retrieves the current resource group name in which the host running the Cilium Operator is located
// This is retrieved via the Azure Instance Metadata Service
func GetResourceGroupName(ctx context.Context) (string, error) {
return getMetadataString(ctx, "instance/compute/resourceGroupName")
}
// getMetadataString returns the text represantation of a field from the Azure IMS (instance metadata service)
// more can be found at https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service#instance-api
func getMetadataString(ctx context.Context, path string) (string, error) {
client := &http.Client{
Timeout: time.Second * 10,
}
url := fmt.Sprintf("%s/%s", metadataURL, path)
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return "", nil
}
query := req.URL.Query()
query.Add("api-version", metadataAPIVersion)
query.Add("format", "text")
req.URL.RawQuery = query.Encode()
req.Header.Add("Metadata", "true")
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer func() {
if err := resp.Body.Close(); err != nil {
log.Errorf("Failed to close body for request %s: %+v", url, err)
}
}()
respBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(respBytes), nil
}