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azure.go
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azure.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 apmcloudutil
import (
"context"
"encoding/json"
"errors"
"net/http"
"go.elastic.co/apm/model"
)
const (
azureMetadataURL = "http://169.254.169.254/metadata/instance/compute?api-version=2019-08-15"
)
// See: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service
func getAzureCloudMetadata(ctx context.Context, client *http.Client, out *model.Cloud) error {
req, err := http.NewRequest("GET", azureMetadataURL, nil)
if err != nil {
return err
}
req.Header.Set("Metadata", "true")
resp, err := client.Do(req.WithContext(ctx))
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return errors.New(resp.Status)
}
var azureMetadata struct {
Location string `json:"location"`
Name string `json:"name"`
ResourceGroupName string `json:"resourceGroupName"`
SubscriptionID string `json:"subscriptionId"`
VMID string `json:"vmId"`
VMSize string `json:"vmSize"`
Zone string `json:"zone"`
}
if err := json.NewDecoder(resp.Body).Decode(&azureMetadata); err != nil {
return err
}
out.Region = azureMetadata.Location
out.AvailabilityZone = azureMetadata.Zone
if azureMetadata.VMID != "" || azureMetadata.Name != "" {
out.Instance = &model.CloudInstance{ID: azureMetadata.VMID, Name: azureMetadata.Name}
}
if azureMetadata.VMSize != "" {
out.Machine = &model.CloudMachine{Type: azureMetadata.VMSize}
}
if azureMetadata.ResourceGroupName != "" {
out.Project = &model.CloudProject{Name: azureMetadata.ResourceGroupName}
}
if azureMetadata.SubscriptionID != "" {
out.Account = &model.CloudAccount{ID: azureMetadata.SubscriptionID}
}
return nil
}