mirror of https://github.com/kubernetes/kops.git
116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azure
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"github.com/Azure/azure-sdk-for-go/services/compute/mgmt/2022-08-01/compute"
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"github.com/Azure/go-autorest/autorest/azure/auth"
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)
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type instanceComputeMetadata struct {
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ResourceGroupName string `json:"resourceGroupName"`
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SubscriptionID string `json:"subscriptionId"`
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}
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type instanceMetadata struct {
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Compute *instanceComputeMetadata `json:"compute"`
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}
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// client is an Azure client.
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type client struct {
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metadata *instanceMetadata
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vmssesClient *compute.VirtualMachineScaleSetsClient
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}
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// newClient returns a new Client.
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func newClient() (*client, error) {
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m, err := queryInstanceMetadata()
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if err != nil {
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return nil, fmt.Errorf("error querying instance metadata: %s", err)
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}
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if m.Compute.SubscriptionID == "" {
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return nil, fmt.Errorf("empty subscription name")
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}
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if m.Compute.ResourceGroupName == "" {
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return nil, fmt.Errorf("empty resource group name")
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}
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authorizer, err := auth.NewAuthorizerFromEnvironment()
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if err != nil {
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return nil, fmt.Errorf("error creating an authorizer: %s", err)
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}
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vmssesClient := compute.NewVirtualMachineScaleSetsClient(m.Compute.SubscriptionID)
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vmssesClient.Authorizer = authorizer
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return &client{
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metadata: m,
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vmssesClient: &vmssesClient,
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}, nil
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}
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// getVMScaleSet returns the specified VM ScaleSet.
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func (c *client) getVMScaleSet(ctx context.Context, vmssName string) (compute.VirtualMachineScaleSet, error) {
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return c.vmssesClient.Get(ctx, c.metadata.Compute.ResourceGroupName, vmssName, compute.UserData)
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}
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// queryInstanceMetadata queries Azure Instance Metadata documented in
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// https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service.
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func queryInstanceMetadata() (*instanceMetadata, error) {
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client := &http.Client{}
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req, err := http.NewRequest("GET", "http://169.254.169.254/metadata/instance", nil)
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if err != nil {
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return nil, fmt.Errorf("error creating a new request: %s", err)
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}
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req.Header.Add("Metadata", "True")
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q := req.URL.Query()
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q.Add("format", "json")
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q.Add("api-version", "2020-06-01")
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req.URL.RawQuery = q.Encode()
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("error sending request to the metadata server: %s", err)
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("error reading a response from the metadata server: %s", err)
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}
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metadata, err := unmarshalInstanceMetadata(body)
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if err != nil {
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return nil, fmt.Errorf("error unmarshalling metadata: %s", err)
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}
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return metadata, nil
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}
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func unmarshalInstanceMetadata(data []byte) (*instanceMetadata, error) {
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m := &instanceMetadata{}
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if err := json.Unmarshal(data, m); err != nil {
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return nil, err
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}
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return m, nil
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}
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