lib/cloud/azure.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: AGPL-3.0
   4
   5 package cloud
   6
   7 import (
   8         "context"
   9         "encoding/base64"
  10         "fmt"
  11         "log"
  12         "net/http"
  13         "regexp"
  14         "strconv"
  15         "strings"
  16         "sync"
  17         "time"
  18
  19         "git.curoverse.com/arvados.git/sdk/go/arvados"
  20         "github.com/Azure/azure-sdk-for-go/services/compute/mgmt/2018-06-01/compute"
  21         "github.com/Azure/azure-sdk-for-go/services/network/mgmt/2018-06-01/network"
  22         storageacct "github.com/Azure/azure-sdk-for-go/services/storage/mgmt/2018-02-01/storage"
  23         "github.com/Azure/azure-sdk-for-go/storage"
  24         "github.com/Azure/go-autorest/autorest"
  25         "github.com/Azure/go-autorest/autorest/azure"
  26         "github.com/Azure/go-autorest/autorest/azure/auth"
  27         "github.com/Azure/go-autorest/autorest/to"
  28         "github.com/jmcvetta/randutil"
  29         "github.com/mitchellh/mapstructure"
  30         "golang.org/x/crypto/ssh"
  31 )
  32
  33 type AzureInstanceSetConfig struct {
  34         SubscriptionID               string  `mapstructure:"subscription_id"`
  35         ClientID                     string  `mapstructure:"key"`
  36         ClientSecret                 string  `mapstructure:"secret"`
  37         TenantID                     string  `mapstructure:"tenant_id"`
  38         CloudEnv                     string  `mapstructure:"cloud_environment"`
  39         ResourceGroup                string  `mapstructure:"resource_group"`
  40         Location                     string  `mapstructure:"region"`
  41         Network                      string  `mapstructure:"network"`
  42         Subnet                       string  `mapstructure:"subnet"`
  43         StorageAccount               string  `mapstructure:"storage_account"`
  44         BlobContainer                string  `mapstructure:"blob_container"`
  45         Image                        string  `mapstructure:"image"`
  46         DeleteDanglingResourcesAfter float64 `mapstructure:"delete_dangling_resources_after"`
  47 }
  48
  49 type VirtualMachinesClientWrapper interface {
  50         CreateOrUpdate(ctx context.Context,
  51                 resourceGroupName string,
  52                 VMName string,
  53                 parameters compute.VirtualMachine) (result compute.VirtualMachine, err error)
  54         Delete(ctx context.Context, resourceGroupName string, VMName string) (result *http.Response, err error)
  55         ListComplete(ctx context.Context, resourceGroupName string) (result compute.VirtualMachineListResultIterator, err error)
  56 }
  57
  58 type VirtualMachinesClientImpl struct {
  59         inner compute.VirtualMachinesClient
  60 }
  61
  62 func (cl *VirtualMachinesClientImpl) CreateOrUpdate(ctx context.Context,
  63         resourceGroupName string,
  64         VMName string,
  65         parameters compute.VirtualMachine) (result compute.VirtualMachine, err error) {
  66
  67         future, err := cl.inner.CreateOrUpdate(ctx, resourceGroupName, VMName, parameters)
  68         if err != nil {
  69                 return compute.VirtualMachine{}, WrapAzureError(err)
  70         }
  71         future.WaitForCompletionRef(ctx, cl.inner.Client)
  72         r, err := future.Result(cl.inner)
  73         return r, WrapAzureError(err)
  74 }
  75
  76 func (cl *VirtualMachinesClientImpl) Delete(ctx context.Context, resourceGroupName string, VMName string) (result *http.Response, err error) {
  77         future, err := cl.inner.Delete(ctx, resourceGroupName, VMName)
  78         if err != nil {
  79                 return nil, WrapAzureError(err)
  80         }
  81         err = future.WaitForCompletionRef(ctx, cl.inner.Client)
  82         return future.Response(), WrapAzureError(err)
  83 }
  84
  85 func (cl *VirtualMachinesClientImpl) ListComplete(ctx context.Context, resourceGroupName string) (result compute.VirtualMachineListResultIterator, err error) {
  86         r, err := cl.inner.ListComplete(ctx, resourceGroupName)
  87         return r, WrapAzureError(err)
  88 }
  89
  90 type InterfacesClientWrapper interface {
  91         CreateOrUpdate(ctx context.Context,
  92                 resourceGroupName string,
  93                 networkInterfaceName string,
  94                 parameters network.Interface) (result network.Interface, err error)
  95         Delete(ctx context.Context, resourceGroupName string, networkInterfaceName string) (result *http.Response, err error)
  96         ListComplete(ctx context.Context, resourceGroupName string) (result network.InterfaceListResultIterator, err error)
  97 }
  98
  99 type InterfacesClientImpl struct {
 100         inner network.InterfacesClient
 101 }
 102
 103 func (cl *InterfacesClientImpl) Delete(ctx context.Context, resourceGroupName string, VMName string) (result *http.Response, err error) {
 104         future, err := cl.inner.Delete(ctx, resourceGroupName, VMName)
 105         if err != nil {
 106                 return nil, WrapAzureError(err)
 107         }
 108         err = future.WaitForCompletionRef(ctx, cl.inner.Client)
 109         return future.Response(), WrapAzureError(err)
 110 }
 111
 112 func (cl *InterfacesClientImpl) CreateOrUpdate(ctx context.Context,
 113         resourceGroupName string,
 114         networkInterfaceName string,
 115         parameters network.Interface) (result network.Interface, err error) {
 116
 117         future, err := cl.inner.CreateOrUpdate(ctx, resourceGroupName, networkInterfaceName, parameters)
 118         if err != nil {
 119                 return network.Interface{}, WrapAzureError(err)
 120         }
 121         future.WaitForCompletionRef(ctx, cl.inner.Client)
 122         r, err := future.Result(cl.inner)
 123         return r, WrapAzureError(err)
 124 }
 125
 126 func (cl *InterfacesClientImpl) ListComplete(ctx context.Context, resourceGroupName string) (result network.InterfaceListResultIterator, err error) {
 127         r, err := cl.inner.ListComplete(ctx, resourceGroupName)
 128         return r, WrapAzureError(err)
 129 }
 130
 131 var quotaRe = regexp.MustCompile(`(?i:exceed|quota|limit)`)
 132
 133 type AzureRateLimitError struct {
 134         azure.RequestError
 135         earliestRetry time.Time
 136 }
 137
 138 func (ar *AzureRateLimitError) EarliestRetry() time.Time {
 139         return ar.earliestRetry
 140 }
 141
 142 type AzureQuotaError struct {
 143         azure.RequestError
 144 }
 145
 146 func (ar *AzureQuotaError) IsQuotaError() bool {
 147         return true
 148 }
 149
 150 func WrapAzureError(err error) error {
 151         de, ok := err.(autorest.DetailedError)
 152         if !ok {
 153                 return err
 154         }
 155         rq, ok := de.Original.(*azure.RequestError)
 156         if !ok {
 157                 return err
 158         }
 159         if rq.Response == nil {
 160                 return err
 161         }
 162         if rq.Response.StatusCode == 429 || len(rq.Response.Header["Retry-After"]) >= 1 {
 163                 // API throttling
 164                 ra := rq.Response.Header["Retry-After"][0]
 165                 earliestRetry, parseErr := http.ParseTime(ra)
 166                 if parseErr != nil {
 167                         // Could not parse as a timestamp, must be number of seconds
 168                         dur, parseErr := strconv.ParseInt(ra, 10, 64)
 169                         if parseErr != nil {
 170                                 earliestRetry = time.Now().Add(time.Duration(dur) * time.Second)
 171                         }
 172                 }
 173                 if parseErr != nil {
 174                         // Couldn't make sense of retry-after,
 175                         // so set retry to 20 seconds
 176                         earliestRetry = time.Now().Add(20 * time.Second)
 177                 }
 178                 return &AzureRateLimitError{*rq, earliestRetry}
 179         }
 180         if rq.ServiceError == nil {
 181                 return err
 182         }
 183         if quotaRe.FindString(rq.ServiceError.Code) != "" || quotaRe.FindString(rq.ServiceError.Message) != "" {
 184                 return &AzureQuotaError{*rq}
 185         }
 186         return err
 187 }
 188
 189 type AzureInstanceSet struct {
 190         azconfig          AzureInstanceSetConfig
 191         vmClient          VirtualMachinesClientWrapper
 192         netClient         InterfacesClientWrapper
 193         storageAcctClient storageacct.AccountsClient
 194         azureEnv          azure.Environment
 195         interfaces        map[string]network.Interface
 196         dispatcherID      string
 197         namePrefix        string
 198         ctx               context.Context
 199         stopFunc          context.CancelFunc
 200         stopWg            sync.WaitGroup
 201         deleteNIC         chan string
 202         deleteBlob        chan storage.Blob
 203 }
 204
 205 func NewAzureInstanceSet(config map[string]interface{}, dispatcherID InstanceSetID) (prv InstanceSet, err error) {
 206         azcfg := AzureInstanceSetConfig{}
 207         if err = mapstructure.Decode(config, &azcfg); err != nil {
 208                 return nil, err
 209         }
 210         ap := AzureInstanceSet{}
 211         err = ap.setup(azcfg, string(dispatcherID))
 212         if err != nil {
 213                 return nil, err
 214         }
 215         return &ap, nil
 216 }
 217
 218 func (az *AzureInstanceSet) setup(azcfg AzureInstanceSetConfig, dispatcherID string) (err error) {
 219         az.azconfig = azcfg
 220         vmClient := compute.NewVirtualMachinesClient(az.azconfig.SubscriptionID)
 221         netClient := network.NewInterfacesClient(az.azconfig.SubscriptionID)
 222         storageAcctClient := storageacct.NewAccountsClient(az.azconfig.SubscriptionID)
 223
 224         az.azureEnv, err = azure.EnvironmentFromName(az.azconfig.CloudEnv)
 225         if err != nil {
 226                 return err
 227         }
 228
 229         authorizer, err := auth.ClientCredentialsConfig{
 230                 ClientID:     az.azconfig.ClientID,
 231                 ClientSecret: az.azconfig.ClientSecret,
 232                 TenantID:     az.azconfig.TenantID,
 233                 Resource:     az.azureEnv.ResourceManagerEndpoint,
 234                 AADEndpoint:  az.azureEnv.ActiveDirectoryEndpoint,
 235         }.Authorizer()
 236         if err != nil {
 237                 return err
 238         }
 239
 240         vmClient.Authorizer = authorizer
 241         netClient.Authorizer = authorizer
 242         storageAcctClient.Authorizer = authorizer
 243
 244         az.vmClient = &VirtualMachinesClientImpl{vmClient}
 245         az.netClient = &InterfacesClientImpl{netClient}
 246         az.storageAcctClient = storageAcctClient
 247
 248         az.dispatcherID = dispatcherID
 249         az.namePrefix = fmt.Sprintf("compute-%s-", az.dispatcherID)
 250
 251         az.ctx, az.stopFunc = context.WithCancel(context.Background())
 252         go func() {
 253                 tk := time.NewTicker(5 * time.Minute)
 254                 for {
 255                         select {
 256                         case <-az.ctx.Done():
 257                                 return
 258                         case <-tk.C:
 259                                 az.ManageBlobs()
 260                         }
 261                 }
 262         }()
 263
 264         az.deleteNIC = make(chan string)
 265         az.deleteBlob = make(chan storage.Blob)
 266
 267         for i := 0; i < 4; i += 1 {
 268                 go func() {
 269                         for {
 270                                 nicname, ok := <-az.deleteNIC
 271                                 if !ok {
 272                                         return
 273                                 }
 274                                 _, delerr := az.netClient.Delete(context.Background(), az.azconfig.ResourceGroup, nicname)
 275                                 if delerr != nil {
 276                                         log.Printf("Error deleting %v: %v", nicname, delerr)
 277                                 } else {
 278                                         log.Printf("Deleted %v", nicname)
 279                                 }
 280                         }
 281                 }()
 282                 go func() {
 283                         for {
 284                                 blob, ok := <-az.deleteBlob
 285                                 if !ok {
 286                                         return
 287                                 }
 288                                 err := blob.Delete(nil)
 289                                 if err != nil {
 290                                         log.Printf("error deleting %v: %v", blob.Name, err)
 291                                 } else {
 292                                         log.Printf("Deleted blob %v", blob.Name)
 293                                 }
 294                         }
 295                 }()
 296         }
 297
 298         return nil
 299 }
 300
 301 func (az *AzureInstanceSet) Create(
 302         instanceType arvados.InstanceType,
 303         imageId ImageID,
 304         newTags InstanceTags,
 305         publicKey ssh.PublicKey) (Instance, error) {
 306
 307         az.stopWg.Add(1)
 308         defer az.stopWg.Done()
 309
 310         if len(newTags["node-token"]) == 0 {
 311                 return nil, fmt.Errorf("Must provide tag 'node-token'")
 312         }
 313
 314         name, err := randutil.String(15, "abcdefghijklmnopqrstuvwxyz0123456789")
 315         if err != nil {
 316                 return nil, err
 317         }
 318
 319         name = az.namePrefix + name
 320
 321         timestamp := time.Now().Format(time.RFC3339Nano)
 322
 323         tags := make(map[string]*string)
 324         tags["created-at"] = &timestamp
 325         for k, v := range newTags {
 326                 newstr := v
 327                 tags["dispatch-"+k] = &newstr
 328         }
 329
 330         tags["dispatch-instance-type"] = &instanceType.Name
 331
 332         nicParameters := network.Interface{
 333                 Location: &az.azconfig.Location,
 334                 Tags:     tags,
 335                 InterfacePropertiesFormat: &network.InterfacePropertiesFormat{
 336                         IPConfigurations: &[]network.InterfaceIPConfiguration{
 337                                 network.InterfaceIPConfiguration{
 338                                         Name: to.StringPtr("ip1"),
 339                                         InterfaceIPConfigurationPropertiesFormat: &network.InterfaceIPConfigurationPropertiesFormat{
 340                                                 Subnet: &network.Subnet{
 341                                                         ID: to.StringPtr(fmt.Sprintf("/subscriptions/%s/resourceGroups/%s/providers"+
 342                                                                 "/Microsoft.Network/virtualnetworks/%s/subnets/%s",
 343                                                                 az.azconfig.SubscriptionID,
 344                                                                 az.azconfig.ResourceGroup,
 345                                                                 az.azconfig.Network,
 346                                                                 az.azconfig.Subnet)),
 347                                                 },
 348                                                 PrivateIPAllocationMethod: network.Dynamic,
 349                                         },
 350                                 },
 351                         },
 352                 },
 353         }
 354         nic, err := az.netClient.CreateOrUpdate(az.ctx, az.azconfig.ResourceGroup, name+"-nic", nicParameters)
 355         if err != nil {
 356                 return nil, WrapAzureError(err)
 357         }
 358
 359         instance_vhd := fmt.Sprintf("https://%s.blob.%s/%s/%s-os.vhd",
 360                 az.azconfig.StorageAccount,
 361                 az.azureEnv.StorageEndpointSuffix,
 362                 az.azconfig.BlobContainer,
 363                 name)
 364
 365         customData := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf(`#!/bin/sh
 366 echo '%s-%s' > /home/crunch/node-token`, name, newTags["node-token"])))
 367
 368         vmParameters := compute.VirtualMachine{
 369                 Location: &az.azconfig.Location,
 370                 Tags:     tags,
 371                 VirtualMachineProperties: &compute.VirtualMachineProperties{
 372                         HardwareProfile: &compute.HardwareProfile{
 373                                 VMSize: compute.VirtualMachineSizeTypes(instanceType.ProviderType),
 374                         },
 375                         StorageProfile: &compute.StorageProfile{
 376                                 OsDisk: &compute.OSDisk{
 377                                         OsType:       compute.Linux,
 378                                         Name:         to.StringPtr(name + "-os"),
 379                                         CreateOption: compute.FromImage,
 380                                         Image: &compute.VirtualHardDisk{
 381                                                 URI: to.StringPtr(string(imageId)),
 382                                         },
 383                                         Vhd: &compute.VirtualHardDisk{
 384                                                 URI: &instance_vhd,
 385                                         },
 386                                 },
 387                         },
 388                         NetworkProfile: &compute.NetworkProfile{
 389                                 NetworkInterfaces: &[]compute.NetworkInterfaceReference{
 390                                         compute.NetworkInterfaceReference{
 391                                                 ID: nic.ID,
 392                                                 NetworkInterfaceReferenceProperties: &compute.NetworkInterfaceReferenceProperties{
 393                                                         Primary: to.BoolPtr(true),
 394                                                 },
 395                                         },
 396                                 },
 397                         },
 398                         OsProfile: &compute.OSProfile{
 399                                 ComputerName:  &name,
 400                                 AdminUsername: to.StringPtr("crunch"),
 401                                 LinuxConfiguration: &compute.LinuxConfiguration{
 402                                         DisablePasswordAuthentication: to.BoolPtr(true),
 403                                         SSH: &compute.SSHConfiguration{
 404                                                 PublicKeys: &[]compute.SSHPublicKey{
 405                                                         compute.SSHPublicKey{
 406                                                                 Path:    to.StringPtr("/home/crunch/.ssh/authorized_keys"),
 407                                                                 KeyData: to.StringPtr(string(ssh.MarshalAuthorizedKey(publicKey))),
 408                                                         },
 409                                                 },
 410                                         },
 411                                 },
 412                                 CustomData: &customData,
 413                         },
 414                 },
 415         }
 416
 417         vm, err := az.vmClient.CreateOrUpdate(az.ctx, az.azconfig.ResourceGroup, name, vmParameters)
 418         if err != nil {
 419                 return nil, WrapAzureError(err)
 420         }
 421
 422         return &AzureInstance{
 423                 provider: az,
 424                 nic:      nic,
 425                 vm:       vm,
 426         }, nil
 427 }
 428
 429 func (az *AzureInstanceSet) Instances(InstanceTags) ([]Instance, error) {
 430         az.stopWg.Add(1)
 431         defer az.stopWg.Done()
 432
 433         interfaces, err := az.ManageNics()
 434         if err != nil {
 435                 return nil, err
 436         }
 437
 438         result, err := az.vmClient.ListComplete(az.ctx, az.azconfig.ResourceGroup)
 439         if err != nil {
 440                 return nil, WrapAzureError(err)
 441         }
 442
 443         instances := make([]Instance, 0)
 444
 445         for ; result.NotDone(); err = result.Next() {
 446                 if err != nil {
 447                         return nil, WrapAzureError(err)
 448                 }
 449                 if strings.HasPrefix(*result.Value().Name, az.namePrefix) {
 450                         instances = append(instances, &AzureInstance{
 451                                 provider: az,
 452                                 vm:       result.Value(),
 453                                 nic:      interfaces[*(*result.Value().NetworkProfile.NetworkInterfaces)[0].ID]})
 454                 }
 455         }
 456         return instances, nil
 457 }
 458
 459 // ManageNics returns a list of Azure network interface resources.
 460 // Also performs garbage collection of NICs which have "namePrefix", are
 461 // not associated with a virtual machine and have a "create-at" time
 462 // more than DeleteDanglingResourcesAfter (to prevent racing and
 463 // deleting newly created NICs) in the past are deleted.
 464 func (az *AzureInstanceSet) ManageNics() (map[string]network.Interface, error) {
 465         az.stopWg.Add(1)
 466         defer az.stopWg.Done()
 467
 468         result, err := az.netClient.ListComplete(az.ctx, az.azconfig.ResourceGroup)
 469         if err != nil {
 470                 return nil, WrapAzureError(err)
 471         }
 472
 473         interfaces := make(map[string]network.Interface)
 474
 475         timestamp := time.Now()
 476         for ; result.NotDone(); err = result.Next() {
 477                 if err != nil {
 478                         log.Printf("Error listing nics: %v", err)
 479                         return interfaces, nil
 480                 }
 481                 if strings.HasPrefix(*result.Value().Name, az.namePrefix) {
 482                         if result.Value().VirtualMachine != nil {
 483                                 interfaces[*result.Value().ID] = result.Value()
 484                         } else {
 485                                 if result.Value().Tags["created-at"] != nil {
 486                                         created_at, err := time.Parse(time.RFC3339Nano, *result.Value().Tags["created-at"])
 487                                         if err == nil {
 488                                                 if timestamp.Sub(created_at).Seconds() > az.azconfig.DeleteDanglingResourcesAfter {
 489                                                         log.Printf("Will delete %v because it is older than %v s", *result.Value().Name, az.azconfig.DeleteDanglingResourcesAfter)
 490                                                         az.deleteNIC <- *result.Value().Name
 491                                                 }
 492                                         }
 493                                 }
 494                         }
 495                 }
 496         }
 497         return interfaces, nil
 498 }
 499
 500 // ManageBlobs garbage collects blobs (VM disk images) in the
 501 // configured storage account container.  It will delete blobs which
 502 // have "namePrefix", are "available" (which means they are not
 503 // leased to a VM) and haven't been modified for
 504 // DeleteDanglingResourcesAfter seconds.
 505 func (az *AzureInstanceSet) ManageBlobs() {
 506         az.stopWg.Add(1)
 507         defer az.stopWg.Done()
 508
 509         result, err := az.storageAcctClient.ListKeys(az.ctx, az.azconfig.ResourceGroup, az.azconfig.StorageAccount)
 510         if err != nil {
 511                 log.Printf("Couldn't get account keys %v", err)
 512                 return
 513         }
 514
 515         key1 := *(*result.Keys)[0].Value
 516         client, err := storage.NewBasicClientOnSovereignCloud(az.azconfig.StorageAccount, key1, az.azureEnv)
 517         if err != nil {
 518                 log.Printf("Couldn't make client %v", err)
 519                 return
 520         }
 521
 522         blobsvc := client.GetBlobService()
 523         blobcont := blobsvc.GetContainerReference(az.azconfig.BlobContainer)
 524
 525         page := storage.ListBlobsParameters{Prefix: az.namePrefix}
 526         timestamp := time.Now()
 527
 528         for {
 529                 response, err := blobcont.ListBlobs(page)
 530                 if err != nil {
 531                         log.Printf("Error listing blobs %v", err)
 532                         return
 533                 }
 534                 for _, b := range response.Blobs {
 535                         age := timestamp.Sub(time.Time(b.Properties.LastModified))
 536                         if b.Properties.BlobType == storage.BlobTypePage &&
 537                                 b.Properties.LeaseState == "available" &&
 538                                 b.Properties.LeaseStatus == "unlocked" &&
 539                                 age.Seconds() > az.azconfig.DeleteDanglingResourcesAfter {
 540
 541                                 log.Printf("Blob %v is unlocked and not modified for %v seconds, will delete", b.Name, age.Seconds())
 542                                 az.deleteBlob <- b
 543                         }
 544                 }
 545                 if response.NextMarker != "" {
 546                         page.Marker = response.NextMarker
 547                 } else {
 548                         break
 549                 }
 550         }
 551 }
 552
 553 func (az *AzureInstanceSet) Stop() {
 554         az.stopFunc()
 555         az.stopWg.Wait()
 556         close(az.deleteNIC)
 557         close(az.deleteBlob)
 558 }
 559
 560 type AzureInstance struct {
 561         provider *AzureInstanceSet
 562         nic      network.Interface
 563         vm       compute.VirtualMachine
 564 }
 565
 566 func (ai *AzureInstance) ID() InstanceID {
 567         return InstanceID(*ai.vm.ID)
 568 }
 569
 570 func (ai *AzureInstance) String() string {
 571         return *ai.vm.Name
 572 }
 573
 574 func (ai *AzureInstance) ProviderType() string {
 575         return string(ai.vm.VirtualMachineProperties.HardwareProfile.VMSize)
 576 }
 577
 578 func (ai *AzureInstance) SetTags(newTags InstanceTags) error {
 579         ai.provider.stopWg.Add(1)
 580         defer ai.provider.stopWg.Done()
 581
 582         tags := make(map[string]*string)
 583
 584         for k, v := range ai.vm.Tags {
 585                 if !strings.HasPrefix(k, "dispatch-") {
 586                         tags[k] = v
 587                 }
 588         }
 589         for k, v := range newTags {
 590                 newstr := v
 591                 tags["dispatch-"+k] = &newstr
 592         }
 593
 594         vmParameters := compute.VirtualMachine{
 595                 Location: &ai.provider.azconfig.Location,
 596                 Tags:     tags,
 597         }
 598         vm, err := ai.provider.vmClient.CreateOrUpdate(ai.provider.ctx, ai.provider.azconfig.ResourceGroup, *ai.vm.Name, vmParameters)
 599         if err != nil {
 600                 return WrapAzureError(err)
 601         }
 602         ai.vm = vm
 603
 604         return nil
 605 }
 606
 607 func (ai *AzureInstance) Tags() InstanceTags {
 608         tags := make(map[string]string)
 609
 610         for k, v := range ai.vm.Tags {
 611                 if strings.HasPrefix(k, "dispatch-") {
 612                         tags[k[9:]] = *v
 613                 }
 614         }
 615
 616         return tags
 617 }
 618
 619 func (ai *AzureInstance) Destroy() error {
 620         ai.provider.stopWg.Add(1)
 621         defer ai.provider.stopWg.Done()
 622
 623         _, err := ai.provider.vmClient.Delete(ai.provider.ctx, ai.provider.azconfig.ResourceGroup, *ai.vm.Name)
 624         return WrapAzureError(err)
 625 }
 626
 627 func (ai *AzureInstance) Address() string {
 628         return *(*ai.nic.IPConfigurations)[0].PrivateIPAddress
 629 }
 630
 631 func (ai *AzureInstance) VerifyHostKey(receivedKey ssh.PublicKey, client *ssh.Client) error {
 632         ai.provider.stopWg.Add(1)
 633         defer ai.provider.stopWg.Done()
 634
 635         remoteFingerprint := ssh.FingerprintSHA256(receivedKey)
 636
 637         tags := ai.Tags()
 638
 639         tg := tags["ssh-pubkey-fingerprint"]
 640         if tg != "" {
 641                 if remoteFingerprint == tg {
 642                         return nil
 643                 } else {
 644                         return fmt.Errorf("Key fingerprint did not match, expected %q got %q", tg, remoteFingerprint)
 645                 }
 646         }
 647
 648         nodetokenTag := tags["node-token"]
 649         if nodetokenTag == "" {
 650                 return fmt.Errorf("Missing node token tag")
 651         }
 652
 653         sess, err := client.NewSession()
 654         if err != nil {
 655                 return err
 656         }
 657
 658         nodetokenbytes, err := sess.Output("cat /home/crunch/node-token")
 659         if err != nil {
 660                 return err
 661         }
 662
 663         nodetoken := strings.TrimSpace(string(nodetokenbytes))
 664
 665         expectedToken := fmt.Sprintf("%s-%s", *ai.vm.Name, nodetokenTag)
 666
 667         if strings.TrimSpace(nodetoken) != expectedToken {
 668                 return fmt.Errorf("Node token did not match, expected %q got %q", expectedToken, nodetoken)
 669         }
 670
 671         sess, err = client.NewSession()
 672         if err != nil {
 673                 return err
 674         }
 675
 676         keyfingerprintbytes, err := sess.Output("ssh-keygen -E sha256 -l -f /etc/ssh/ssh_host_rsa_key.pub")
 677         if err != nil {
 678                 return err
 679         }
 680
 681         sp := strings.Split(string(keyfingerprintbytes), " ")
 682
 683         if remoteFingerprint != sp[1] {
 684                 return fmt.Errorf("Key fingerprint did not match, expected %q got %q", sp[1], remoteFingerprint)
 685         }
 686
 687         tags["ssh-pubkey-fingerprint"] = sp[1]
 688         delete(tags, "node-token")
 689         ai.SetTags(tags)
 690         return nil
 691 }