2017-07-08 15:38:48 +02:00
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package azure
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import (
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"context"
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2020-12-19 12:40:50 +01:00
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"crypto/md5"
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2018-05-31 21:26:28 +02:00
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"encoding/base64"
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2022-03-05 19:16:13 +01:00
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"fmt"
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2020-12-19 12:39:48 +01:00
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"hash"
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2017-07-08 15:38:48 +02:00
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"io"
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2017-08-05 21:25:38 +02:00
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"net/http"
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2017-07-08 15:38:48 +02:00
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"os"
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"path"
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"strings"
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"github.com/restic/restic/internal/backend"
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2022-10-15 16:23:39 +02:00
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"github.com/restic/restic/internal/backend/layout"
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2022-06-12 17:45:34 +02:00
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"github.com/restic/restic/internal/backend/sema"
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2017-07-08 15:38:48 +02:00
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"github.com/restic/restic/internal/debug"
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2017-08-05 21:46:15 +02:00
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"github.com/restic/restic/internal/errors"
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2017-07-08 15:38:48 +02:00
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"github.com/restic/restic/internal/restic"
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2020-12-17 12:47:53 +01:00
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"github.com/Azure/azure-sdk-for-go/storage"
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"github.com/cenkalti/backoff/v4"
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2017-07-08 15:38:48 +02:00
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)
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// Backend stores data on an azure endpoint.
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type Backend struct {
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accountName string
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container *storage.Container
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connections uint
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sem sema.Semaphore
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prefix string
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listMaxItems int
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layout.Layout
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2017-07-08 15:38:48 +02:00
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}
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2017-09-18 12:01:54 +02:00
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const defaultListMaxItems = 5000
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2017-07-08 15:38:48 +02:00
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// make sure that *Backend implements backend.Backend
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var _ restic.Backend = &Backend{}
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2017-09-24 20:04:23 +02:00
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func open(cfg Config, rt http.RoundTripper) (*Backend, error) {
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2017-07-08 15:38:48 +02:00
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debug.Log("open, config %#v", cfg)
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var client storage.Client
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var err error
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if cfg.AccountKey.String() != "" {
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// We have an account key value, find the BlobServiceClient
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// from with a BasicClient
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debug.Log(" - using account key")
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client, err = storage.NewBasicClient(cfg.AccountName, cfg.AccountKey.Unwrap())
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if err != nil {
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return nil, errors.Wrap(err, "NewBasicClient")
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}
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} else if cfg.AccountSAS.String() != "" {
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// Get the client using the SAS Token as authentication, this
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// is longer winded than above because the SDK wants a URL for the Account
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// if your using a SAS token, and not just the account name
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// we (as per the SDK ) assume the default Azure portal.
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url := fmt.Sprintf("https://%s.blob.core.windows.net/", cfg.AccountName)
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debug.Log(" - using sas token")
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2022-07-16 23:45:41 +02:00
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sas := cfg.AccountSAS.Unwrap()
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// strip query sign prefix
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if sas[0] == '?' {
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sas = sas[1:]
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}
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client, err = storage.NewAccountSASClientFromEndpointToken(url, sas)
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if err != nil {
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return nil, errors.Wrap(err, "NewAccountSASClientFromEndpointToken")
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}
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} else {
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return nil, errors.New("no azure authentication information found")
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2017-07-08 15:38:48 +02:00
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}
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2017-09-24 20:04:23 +02:00
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client.HTTPClient = &http.Client{Transport: rt}
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2017-08-05 21:25:38 +02:00
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2017-07-08 15:38:48 +02:00
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service := client.GetBlobService()
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2022-06-12 17:45:34 +02:00
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sem, err := sema.New(cfg.Connections)
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2017-07-08 15:38:48 +02:00
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if err != nil {
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return nil, err
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}
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be := &Backend{
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container: service.GetContainerReference(cfg.Container),
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accountName: cfg.AccountName,
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connections: cfg.Connections,
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sem: sem,
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prefix: cfg.Prefix,
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Layout: &layout.DefaultLayout{
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Path: cfg.Prefix,
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Join: path.Join,
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},
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listMaxItems: defaultListMaxItems,
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2017-07-08 15:38:48 +02:00
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}
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return be, nil
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}
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// Open opens the Azure backend at specified container.
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2018-05-31 21:26:28 +02:00
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func Open(cfg Config, rt http.RoundTripper) (*Backend, error) {
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return open(cfg, rt)
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2017-07-08 15:38:48 +02:00
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}
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// Create opens the Azure backend at specified container and creates the container if
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// it does not exist yet.
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2018-05-31 21:26:28 +02:00
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func Create(cfg Config, rt http.RoundTripper) (*Backend, error) {
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2017-09-24 20:04:23 +02:00
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be, err := open(cfg, rt)
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2017-07-08 15:38:48 +02:00
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if err != nil {
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return nil, errors.Wrap(err, "open")
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}
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options := storage.CreateContainerOptions{
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Access: storage.ContainerAccessTypePrivate,
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}
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_, err = be.container.CreateIfNotExists(&options)
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if err != nil {
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return nil, errors.Wrap(err, "container.CreateIfNotExists")
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}
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return be, nil
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}
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2017-09-18 12:01:54 +02:00
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// SetListMaxItems sets the number of list items to load per request.
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func (be *Backend) SetListMaxItems(i int) {
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be.listMaxItems = i
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}
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2017-07-08 15:38:48 +02:00
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// IsNotExist returns true if the error is caused by a not existing file.
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func (be *Backend) IsNotExist(err error) bool {
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debug.Log("IsNotExist(%T, %#v)", err, err)
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return os.IsNotExist(err)
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}
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// Join combines path components with slashes.
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func (be *Backend) Join(p ...string) string {
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return path.Join(p...)
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}
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2021-08-07 22:20:49 +02:00
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func (be *Backend) Connections() uint {
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return be.connections
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}
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2017-07-08 15:38:48 +02:00
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// Location returns this backend's location (the container name).
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func (be *Backend) Location() string {
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return be.Join(be.container.Name, be.prefix)
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}
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2020-12-19 12:39:48 +01:00
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// Hasher may return a hash function for calculating a content hash for the backend
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func (be *Backend) Hasher() hash.Hash {
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return md5.New()
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}
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2022-05-01 20:07:29 +02:00
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// HasAtomicReplace returns whether Save() can atomically replace files
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func (be *Backend) HasAtomicReplace() bool {
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return true
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}
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2017-07-08 15:38:48 +02:00
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// Path returns the path in the bucket that is used for this backend.
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func (be *Backend) Path() string {
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return be.prefix
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}
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2020-12-18 23:36:45 +01:00
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type azureAdapter struct {
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restic.RewindReader
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}
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func (azureAdapter) Close() error { return nil }
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2021-01-29 21:08:41 +01:00
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func (a azureAdapter) Len() int {
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2020-12-18 23:36:45 +01:00
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return int(a.Length())
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}
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2017-07-08 15:38:48 +02:00
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// Save stores data in the backend at the handle.
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2018-03-03 14:20:54 +01:00
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func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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if err := h.Valid(); err != nil {
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return backoff.Permanent(err)
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}
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objName := be.Filename(h)
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debug.Log("Save %v at %v", h, objName)
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be.sem.GetToken()
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debug.Log("InsertObject(%v, %v)", be.container.Name, objName)
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2018-05-31 21:26:28 +02:00
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var err error
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if rd.Length() < 256*1024*1024 {
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// wrap the reader so that net/http client cannot close the reader
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2020-12-18 23:36:45 +01:00
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// CreateBlockBlobFromReader reads length from `Len()``
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dataReader := azureAdapter{rd}
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2018-05-31 21:26:28 +02:00
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// if it's smaller than 256miB, then just create the file directly from the reader
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2020-12-19 12:40:50 +01:00
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ref := be.container.GetBlobReference(objName)
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ref.Properties.ContentMD5 = base64.StdEncoding.EncodeToString(rd.Hash())
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err = ref.CreateBlockBlobFromReader(dataReader, nil)
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2018-05-31 21:26:28 +02:00
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} else {
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// otherwise use the more complicated method
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err = be.saveLarge(ctx, objName, rd)
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}
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2017-07-08 15:38:48 +02:00
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be.sem.ReleaseToken()
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debug.Log("%v, err %#v", objName, err)
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return errors.Wrap(err, "CreateBlockBlobFromReader")
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}
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2018-05-31 21:26:28 +02:00
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func (be *Backend) saveLarge(ctx context.Context, objName string, rd restic.RewindReader) error {
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// create the file on the server
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file := be.container.GetBlobReference(objName)
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err := file.CreateBlockBlob(nil)
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if err != nil {
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return errors.Wrap(err, "CreateBlockBlob")
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}
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// read the data, in 100 MiB chunks
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buf := make([]byte, 100*1024*1024)
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var blocks []storage.Block
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uploadedBytes := 0
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2018-05-31 21:26:28 +02:00
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for {
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n, err := io.ReadFull(rd, buf)
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if err == io.ErrUnexpectedEOF {
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err = nil
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}
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if err == io.EOF {
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// end of file reached, no bytes have been read at all
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break
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}
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if err != nil {
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return errors.Wrap(err, "ReadFull")
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}
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buf = buf[:n]
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uploadedBytes += n
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2018-05-31 21:26:28 +02:00
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// upload it as a new "block", use the base64 hash for the ID
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h := md5.Sum(buf)
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2018-05-31 21:26:28 +02:00
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id := base64.StdEncoding.EncodeToString(h[:])
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debug.Log("PutBlock %v with %d bytes", id, len(buf))
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2020-12-19 12:40:50 +01:00
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err = file.PutBlock(id, buf, &storage.PutBlockOptions{ContentMD5: id})
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2018-05-31 21:26:28 +02:00
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if err != nil {
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return errors.Wrap(err, "PutBlock")
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}
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blocks = append(blocks, storage.Block{
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ID: id,
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Status: "Uncommitted",
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})
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}
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2020-12-18 23:41:29 +01:00
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// sanity check
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if uploadedBytes != int(rd.Length()) {
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return errors.Errorf("wrote %d bytes instead of the expected %d bytes", uploadedBytes, rd.Length())
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}
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2018-05-31 21:26:28 +02:00
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debug.Log("uploaded %d parts: %v", len(blocks), blocks)
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err = file.PutBlockList(blocks, nil)
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debug.Log("PutBlockList returned %v", err)
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return errors.Wrap(err, "PutBlockList")
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}
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2018-01-17 05:59:16 +01:00
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// Load runs fn with a reader that yields the contents of the file at h at the
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// given offset.
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func (be *Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
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return backend.DefaultLoad(ctx, h, length, offset, be.openReader, fn)
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}
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func (be *Backend) openReader(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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2017-07-08 15:38:48 +02:00
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debug.Log("Load %v, length %v, offset %v from %v", h, length, offset, be.Filename(h))
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if err := h.Valid(); err != nil {
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2020-12-17 12:47:53 +01:00
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return nil, backoff.Permanent(err)
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2017-07-08 15:38:48 +02:00
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}
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if offset < 0 {
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return nil, errors.New("offset is negative")
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}
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if length < 0 {
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return nil, errors.Errorf("invalid length %d", length)
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}
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objName := be.Filename(h)
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blob := be.container.GetBlobReference(objName)
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start := uint64(offset)
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var end uint64
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if length > 0 {
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end = uint64(offset + int64(length) - 1)
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} else {
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end = 0
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}
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be.sem.GetToken()
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rd, err := blob.GetRange(&storage.GetBlobRangeOptions{Range: &storage.BlobRange{Start: start, End: end}})
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if err != nil {
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be.sem.ReleaseToken()
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return nil, err
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}
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2021-08-07 19:45:52 +02:00
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return be.sem.ReleaseTokenOnClose(rd, nil), err
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2017-07-08 15:38:48 +02:00
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}
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// Stat returns information about a blob.
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2017-10-31 12:32:30 +01:00
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func (be *Backend) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
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2017-07-08 15:38:48 +02:00
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debug.Log("%v", h)
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objName := be.Filename(h)
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blob := be.container.GetBlobReference(objName)
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2017-10-31 12:32:30 +01:00
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be.sem.GetToken()
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err := blob.GetProperties(nil)
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be.sem.ReleaseToken()
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if err != nil {
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2017-07-08 15:38:48 +02:00
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|
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debug.Log("blob.GetProperties err %v", err)
|
|
|
|
return restic.FileInfo{}, errors.Wrap(err, "blob.GetProperties")
|
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
fi := restic.FileInfo{
|
|
|
|
Size: int64(blob.Properties.ContentLength),
|
|
|
|
Name: h.Name,
|
|
|
|
}
|
|
|
|
return fi, nil
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// Test returns true if a blob of the given type and name exists in the backend.
|
|
|
|
func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
|
|
|
|
objName := be.Filename(h)
|
2017-10-31 12:32:30 +01:00
|
|
|
|
|
|
|
be.sem.GetToken()
|
2017-07-08 15:38:48 +02:00
|
|
|
found, err := be.container.GetBlobReference(objName).Exists()
|
2017-10-31 12:32:30 +01:00
|
|
|
be.sem.ReleaseToken()
|
|
|
|
|
2017-07-08 15:38:48 +02:00
|
|
|
if err != nil {
|
|
|
|
return false, err
|
|
|
|
}
|
|
|
|
return found, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Remove removes the blob with the given name and type.
|
|
|
|
func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
|
|
|
|
objName := be.Filename(h)
|
2017-10-31 12:32:30 +01:00
|
|
|
|
|
|
|
be.sem.GetToken()
|
2017-07-08 15:38:48 +02:00
|
|
|
_, err := be.container.GetBlobReference(objName).DeleteIfExists(nil)
|
2017-10-31 12:32:30 +01:00
|
|
|
be.sem.ReleaseToken()
|
|
|
|
|
2017-07-08 15:38:48 +02:00
|
|
|
debug.Log("Remove(%v) at %v -> err %v", h, objName, err)
|
|
|
|
return errors.Wrap(err, "client.RemoveObject")
|
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
// List runs fn for each file in the backend which has the type t. When an
|
|
|
|
// error occurs (or fn returns an error), List stops and returns it.
|
|
|
|
func (be *Backend) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
|
2017-07-08 15:38:48 +02:00
|
|
|
debug.Log("listing %v", t)
|
|
|
|
|
2017-12-14 19:13:01 +01:00
|
|
|
prefix, _ := be.Basedir(t)
|
2017-07-08 15:38:48 +02:00
|
|
|
|
|
|
|
// make sure prefix ends with a slash
|
2018-01-20 19:34:38 +01:00
|
|
|
if !strings.HasSuffix(prefix, "/") {
|
2017-07-08 15:38:48 +02:00
|
|
|
prefix += "/"
|
|
|
|
}
|
|
|
|
|
2017-09-17 11:32:05 +02:00
|
|
|
params := storage.ListBlobsParameters{
|
2017-09-18 12:01:54 +02:00
|
|
|
MaxResults: uint(be.listMaxItems),
|
2017-09-17 11:32:05 +02:00
|
|
|
Prefix: prefix,
|
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
for {
|
|
|
|
be.sem.GetToken()
|
|
|
|
obj, err := be.container.ListBlobs(params)
|
|
|
|
be.sem.ReleaseToken()
|
2017-07-08 15:38:48 +02:00
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
2017-10-31 12:32:30 +01:00
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
debug.Log("got %v objects", len(obj.Blobs))
|
|
|
|
|
|
|
|
for _, item := range obj.Blobs {
|
|
|
|
m := strings.TrimPrefix(item.Name, prefix)
|
|
|
|
if m == "" {
|
|
|
|
continue
|
2017-09-17 11:32:05 +02:00
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
fi := restic.FileInfo{
|
|
|
|
Name: path.Base(m),
|
|
|
|
Size: item.Properties.ContentLength,
|
|
|
|
}
|
2017-07-08 15:38:48 +02:00
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
if ctx.Err() != nil {
|
|
|
|
return ctx.Err()
|
|
|
|
}
|
2017-09-17 11:32:05 +02:00
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
err := fn(fi)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
if ctx.Err() != nil {
|
|
|
|
return ctx.Err()
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
2018-01-20 19:34:38 +01:00
|
|
|
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
|
|
|
|
2018-01-20 19:34:38 +01:00
|
|
|
if obj.NextMarker == "" {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
params.Marker = obj.NextMarker
|
|
|
|
}
|
|
|
|
|
|
|
|
return ctx.Err()
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// Remove keys for a specified backend type.
|
|
|
|
func (be *Backend) removeKeys(ctx context.Context, t restic.FileType) error {
|
2018-01-20 19:34:38 +01:00
|
|
|
return be.List(ctx, t, func(fi restic.FileInfo) error {
|
|
|
|
return be.Remove(ctx, restic.Handle{Type: t, Name: fi.Name})
|
|
|
|
})
|
2017-07-08 15:38:48 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// Delete removes all restic keys in the bucket. It will not remove the bucket itself.
|
|
|
|
func (be *Backend) Delete(ctx context.Context) error {
|
|
|
|
alltypes := []restic.FileType{
|
2020-08-16 11:16:38 +02:00
|
|
|
restic.PackFile,
|
2017-07-08 15:38:48 +02:00
|
|
|
restic.KeyFile,
|
|
|
|
restic.LockFile,
|
|
|
|
restic.SnapshotFile,
|
|
|
|
restic.IndexFile}
|
|
|
|
|
|
|
|
for _, t := range alltypes {
|
|
|
|
err := be.removeKeys(ctx, t)
|
|
|
|
if err != nil {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return be.Remove(ctx, restic.Handle{Type: restic.ConfigFile})
|
|
|
|
}
|
|
|
|
|
|
|
|
// Close does nothing
|
|
|
|
func (be *Backend) Close() error { return nil }
|