mirror of
https://github.com/restic/restic.git
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323 lines
7.6 KiB
Go
323 lines
7.6 KiB
Go
package swift
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"path"
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"path/filepath"
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"strings"
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"time"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/ncw/swift"
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)
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const connLimit = 10
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// beSwift is a backend which stores the data on a swift endpoint.
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type beSwift struct {
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conn *swift.Connection
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sem *backend.Semaphore
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container string // Container name
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prefix string // Prefix of object names in the container
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backend.Layout
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}
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// ensure statically that *beSwift implements restic.Backend.
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var _ restic.Backend = &beSwift{}
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// Open opens the swift backend at a container in region. The container is
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// created if it does not exist yet.
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func Open(cfg Config) (restic.Backend, error) {
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debug.Log("config %#v", cfg)
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sem, err := backend.NewSemaphore(cfg.Connections)
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if err != nil {
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return nil, err
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}
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be := &beSwift{
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conn: &swift.Connection{
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UserName: cfg.UserName,
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Domain: cfg.Domain,
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ApiKey: cfg.APIKey,
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AuthUrl: cfg.AuthURL,
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Region: cfg.Region,
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Tenant: cfg.Tenant,
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TenantId: cfg.TenantID,
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TenantDomain: cfg.TenantDomain,
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TrustId: cfg.TrustID,
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StorageUrl: cfg.StorageURL,
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AuthToken: cfg.AuthToken,
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ConnectTimeout: time.Minute,
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Timeout: time.Minute,
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Transport: backend.Transport(),
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},
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sem: sem,
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container: cfg.Container,
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prefix: cfg.Prefix,
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Layout: &backend.DefaultLayout{
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Path: cfg.Prefix,
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Join: path.Join,
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},
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}
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// Authenticate if needed
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if !be.conn.Authenticated() {
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if err := be.conn.Authenticate(); err != nil {
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return nil, errors.Wrap(err, "conn.Authenticate")
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}
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}
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// Ensure container exists
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switch _, _, err := be.conn.Container(be.container); err {
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case nil:
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// Container exists
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case swift.ContainerNotFound:
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err = be.createContainer(cfg.DefaultContainerPolicy)
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if err != nil {
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return nil, errors.Wrap(err, "beSwift.createContainer")
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}
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default:
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return nil, errors.Wrap(err, "conn.Container")
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}
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return be, nil
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}
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func (be *beSwift) createContainer(policy string) error {
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var h swift.Headers
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if policy != "" {
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h = swift.Headers{
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"X-Storage-Policy": policy,
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}
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}
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return be.conn.ContainerCreate(be.container, h)
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}
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// Location returns this backend's location (the container name).
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func (be *beSwift) Location() string {
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return be.container
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}
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// Load returns a reader that yields the contents of the file at h at the
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// given offset. If length is nonzero, only a portion of the file is
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// returned. rd must be closed after use.
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func (be *beSwift) Load(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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debug.Log("Load %v, length %v, offset %v", h, length, offset)
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if err := h.Valid(); err != nil {
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return nil, err
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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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be.sem.GetToken()
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defer func() {
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be.sem.ReleaseToken()
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}()
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headers := swift.Headers{}
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if offset > 0 {
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headers["Range"] = fmt.Sprintf("bytes=%d-", offset)
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}
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if length > 0 {
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headers["Range"] = fmt.Sprintf("bytes=%d-%d", offset, offset+int64(length)-1)
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}
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if _, ok := headers["Range"]; ok {
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debug.Log("Load(%v) send range %v", h, headers["Range"])
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}
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obj, _, err := be.conn.ObjectOpen(be.container, objName, false, headers)
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if err != nil {
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debug.Log(" err %v", err)
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return nil, errors.Wrap(err, "conn.ObjectOpen")
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}
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return obj, nil
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}
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// Save stores data in the backend at the handle.
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func (be *beSwift) Save(ctx context.Context, h restic.Handle, rd io.Reader) (err error) {
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if err = h.Valid(); err != nil {
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return 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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// Check key does not already exist
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switch _, _, err = be.conn.Object(be.container, objName); err {
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case nil:
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debug.Log("%v already exists", h)
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return errors.New("key already exists")
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case swift.ObjectNotFound:
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// Ok, that's what we want
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default:
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return errors.Wrap(err, "conn.Object")
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}
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be.sem.GetToken()
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defer func() {
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be.sem.ReleaseToken()
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}()
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encoding := "binary/octet-stream"
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debug.Log("PutObject(%v, %v, %v)", be.container, objName, encoding)
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_, err = be.conn.ObjectPut(be.container, objName, rd, true, "", encoding, nil)
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debug.Log("%v, err %#v", objName, err)
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return errors.Wrap(err, "client.PutObject")
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}
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// Stat returns information about a blob.
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func (be *beSwift) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInfo, err error) {
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debug.Log("%v", h)
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objName := be.Filename(h)
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obj, _, err := be.conn.Object(be.container, objName)
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if err != nil {
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debug.Log("Object() err %v", err)
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return restic.FileInfo{}, errors.Wrap(err, "conn.Object")
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}
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return restic.FileInfo{Size: obj.Bytes}, nil
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}
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// Test returns true if a blob of the given type and name exists in the backend.
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func (be *beSwift) Test(ctx context.Context, h restic.Handle) (bool, error) {
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objName := be.Filename(h)
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switch _, _, err := be.conn.Object(be.container, objName); err {
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case nil:
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return true, nil
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case swift.ObjectNotFound:
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return false, nil
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default:
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return false, errors.Wrap(err, "conn.Object")
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}
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}
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// Remove removes the blob with the given name and type.
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func (be *beSwift) Remove(ctx context.Context, h restic.Handle) error {
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objName := be.Filename(h)
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err := be.conn.ObjectDelete(be.container, objName)
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debug.Log("Remove(%v) -> err %v", h, err)
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return errors.Wrap(err, "conn.ObjectDelete")
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}
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// List returns a channel that yields all names of blobs of type t. A
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// goroutine is started for this. If the channel done is closed, sending
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// stops.
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func (be *beSwift) List(ctx context.Context, t restic.FileType) <-chan string {
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debug.Log("listing %v", t)
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ch := make(chan string)
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prefix := be.Filename(restic.Handle{Type: t}) + "/"
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go func() {
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defer close(ch)
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err := be.conn.ObjectsWalk(be.container, &swift.ObjectsOpts{Prefix: prefix},
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func(opts *swift.ObjectsOpts) (interface{}, error) {
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newObjects, err := be.conn.ObjectNames(be.container, opts)
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if err != nil {
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return nil, errors.Wrap(err, "conn.ObjectNames")
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}
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for _, obj := range newObjects {
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m := filepath.Base(strings.TrimPrefix(obj, prefix))
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if m == "" {
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continue
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}
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select {
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case ch <- m:
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case <-ctx.Done():
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return nil, io.EOF
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}
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}
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return newObjects, nil
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})
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if err != nil {
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debug.Log("ObjectsWalk returned error: %v", err)
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}
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}()
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return ch
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}
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// Remove keys for a specified backend type.
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func (be *beSwift) removeKeys(ctx context.Context, t restic.FileType) error {
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for key := range be.List(ctx, t) {
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err := be.Remove(ctx, restic.Handle{Type: t, Name: key})
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if err != nil {
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return err
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}
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}
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return nil
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}
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// IsNotExist returns true if the error is caused by a not existing file.
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func (be *beSwift) IsNotExist(err error) bool {
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if e, ok := errors.Cause(err).(*swift.Error); ok {
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return e.StatusCode == http.StatusNotFound
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}
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return false
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}
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// Delete removes all restic objects in the container.
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// It will not remove the container itself.
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func (be *beSwift) Delete(ctx context.Context) error {
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alltypes := []restic.FileType{
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restic.DataFile,
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restic.KeyFile,
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restic.LockFile,
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restic.SnapshotFile,
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restic.IndexFile}
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for _, t := range alltypes {
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err := be.removeKeys(ctx, t)
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if err != nil {
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return nil
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}
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}
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err := be.Remove(ctx, restic.Handle{Type: restic.ConfigFile})
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if err != nil && !be.IsNotExist(err) {
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return err
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}
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return nil
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}
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// Close does nothing
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func (be *beSwift) Close() error { return nil }
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