mirror of
https://github.com/restic/restic.git
synced 2024-08-20 03:13:22 +02:00
512 lines
12 KiB
Go
512 lines
12 KiB
Go
package s3
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import (
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"context"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"path"
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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/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/minio/minio-go"
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"github.com/minio/minio-go/pkg/credentials"
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"github.com/restic/restic/internal/debug"
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)
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// Backend stores data on an S3 endpoint.
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type Backend struct {
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client *minio.Client
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sem *backend.Semaphore
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cfg Config
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backend.Layout
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}
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// make sure that *Backend implements backend.Backend
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var _ restic.Backend = &Backend{}
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const defaultLayout = "default"
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func open(cfg Config, rt http.RoundTripper) (*Backend, error) {
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debug.Log("open, config %#v", cfg)
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if cfg.MaxRetries > 0 {
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minio.MaxRetry = int(cfg.MaxRetries)
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}
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// Chains all credential types, starting with
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// Static credentials provided by user.
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// IAM profile based credentials. (performs an HTTP
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// call to a pre-defined endpoint, only valid inside
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// configured ec2 instances)
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// AWS env variables such as AWS_ACCESS_KEY_ID
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// Minio env variables such as MINIO_ACCESS_KEY
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creds := credentials.NewChainCredentials([]credentials.Provider{
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&credentials.EnvAWS{},
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&credentials.Static{
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Value: credentials.Value{
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AccessKeyID: cfg.KeyID,
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SecretAccessKey: cfg.Secret,
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},
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},
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&credentials.IAM{
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Client: &http.Client{
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Transport: http.DefaultTransport,
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},
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},
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&credentials.EnvMinio{},
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})
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client, err := minio.NewWithCredentials(cfg.Endpoint, creds, !cfg.UseHTTP, "")
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if err != nil {
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return nil, errors.Wrap(err, "minio.NewWithCredentials")
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}
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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 := &Backend{
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client: client,
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sem: sem,
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cfg: cfg,
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}
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client.SetCustomTransport(rt)
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l, err := backend.ParseLayout(be, cfg.Layout, defaultLayout, cfg.Prefix)
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if err != nil {
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return nil, err
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}
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be.Layout = l
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return be, nil
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}
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// Open opens the S3 backend at bucket and region. The bucket is created if it
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// does not exist yet.
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func Open(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
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return open(cfg, rt)
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}
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// Create opens the S3 backend at bucket and region and creates the bucket if
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// it does not exist yet.
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func Create(cfg Config, rt http.RoundTripper) (restic.Backend, error) {
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be, err := open(cfg, rt)
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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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found, err := be.client.BucketExists(cfg.Bucket)
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if err != nil && be.IsAccessDenied(err) {
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err = nil
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found = true
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}
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if err != nil {
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debug.Log("BucketExists(%v) returned err %v", cfg.Bucket, err)
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return nil, errors.Wrap(err, "client.BucketExists")
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}
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if !found {
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// create new bucket with default ACL in default region
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err = be.client.MakeBucket(cfg.Bucket, "")
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if err != nil {
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return nil, errors.Wrap(err, "client.MakeBucket")
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}
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}
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return be, nil
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}
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// IsAccessDenied returns true if the error is caused by Access Denied.
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func (be *Backend) IsAccessDenied(err error) bool {
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debug.Log("IsAccessDenied(%T, %#v)", err, err)
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if e, ok := errors.Cause(err).(minio.ErrorResponse); ok && e.Code == "AccessDenied" {
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return true
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}
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return false
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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 *Backend) IsNotExist(err error) bool {
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debug.Log("IsNotExist(%T, %#v)", err, err)
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if os.IsNotExist(errors.Cause(err)) {
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return true
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}
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if e, ok := errors.Cause(err).(minio.ErrorResponse); ok && e.Code == "NoSuchKey" {
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return true
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}
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return false
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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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type fileInfo struct {
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name string
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size int64
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mode os.FileMode
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modTime time.Time
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isDir bool
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}
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func (fi fileInfo) Name() string { return fi.name } // base name of the file
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func (fi fileInfo) Size() int64 { return fi.size } // length in bytes for regular files; system-dependent for others
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func (fi fileInfo) Mode() os.FileMode { return fi.mode } // file mode bits
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func (fi fileInfo) ModTime() time.Time { return fi.modTime } // modification time
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func (fi fileInfo) IsDir() bool { return fi.isDir } // abbreviation for Mode().IsDir()
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func (fi fileInfo) Sys() interface{} { return nil } // underlying data source (can return nil)
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// ReadDir returns the entries for a directory.
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func (be *Backend) ReadDir(dir string) (list []os.FileInfo, err error) {
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debug.Log("ReadDir(%v)", dir)
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// make sure dir ends with a slash
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if dir[len(dir)-1] != '/' {
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dir += "/"
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}
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done := make(chan struct{})
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defer close(done)
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for obj := range be.client.ListObjects(be.cfg.Bucket, dir, false, done) {
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if obj.Key == "" {
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continue
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}
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name := strings.TrimPrefix(obj.Key, dir)
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// Sometimes s3 returns an entry for the dir itself. Ignore it.
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if name == "" {
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continue
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}
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entry := fileInfo{
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name: name,
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size: obj.Size,
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modTime: obj.LastModified,
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}
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if name[len(name)-1] == '/' {
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entry.isDir = true
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entry.mode = os.ModeDir | 0755
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entry.name = name[:len(name)-1]
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} else {
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entry.mode = 0644
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}
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list = append(list, entry)
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}
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return list, nil
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}
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// Location returns this backend's location (the bucket name).
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func (be *Backend) Location() string {
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return be.Join(be.cfg.Bucket, be.cfg.Prefix)
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}
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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.cfg.Prefix
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}
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// lenForFile returns the length of the file.
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func lenForFile(f *os.File) (int64, error) {
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fi, err := f.Stat()
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if err != nil {
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return 0, errors.Wrap(err, "Stat")
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}
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pos, err := f.Seek(0, io.SeekCurrent)
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if err != nil {
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return 0, errors.Wrap(err, "Seek")
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}
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size := fi.Size() - pos
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return size, nil
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}
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// Save stores data in the backend at the handle.
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func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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debug.Log("Save %v", h)
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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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be.sem.GetToken()
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defer be.sem.ReleaseToken()
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opts := minio.PutObjectOptions{}
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opts.ContentType = "application/octet-stream"
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debug.Log("PutObject(%v, %v, %v)", be.cfg.Bucket, objName, rd.Length())
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n, err := be.client.PutObjectWithContext(ctx, be.cfg.Bucket, objName, ioutil.NopCloser(rd), int64(rd.Length()), opts)
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debug.Log("%v -> %v bytes, err %#v: %v", objName, n, err, err)
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return errors.Wrap(err, "client.PutObject")
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}
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// wrapReader wraps an io.ReadCloser to run an additional function on Close.
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type wrapReader struct {
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io.ReadCloser
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f func()
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}
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func (wr wrapReader) Close() error {
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err := wr.ReadCloser.Close()
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wr.f()
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return err
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}
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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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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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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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opts := minio.GetObjectOptions{}
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var err error
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if length > 0 {
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debug.Log("range: %v-%v", offset, offset+int64(length)-1)
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err = opts.SetRange(offset, offset+int64(length)-1)
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} else if offset > 0 {
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debug.Log("range: %v-", offset)
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err = opts.SetRange(offset, 0)
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}
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if err != nil {
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return nil, errors.Wrap(err, "SetRange")
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}
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be.sem.GetToken()
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coreClient := minio.Core{Client: be.client}
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rd, err := coreClient.GetObjectWithContext(ctx, be.cfg.Bucket, objName, opts)
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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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closeRd := wrapReader{
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ReadCloser: rd,
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f: func() {
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debug.Log("Close()")
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be.sem.ReleaseToken()
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},
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}
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return closeRd, err
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}
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// Stat returns information about a blob.
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func (be *Backend) 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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var obj *minio.Object
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opts := minio.GetObjectOptions{}
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be.sem.GetToken()
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obj, err = be.client.GetObjectWithContext(ctx, be.cfg.Bucket, objName, opts)
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if err != nil {
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debug.Log("GetObject() err %v", err)
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be.sem.ReleaseToken()
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return restic.FileInfo{}, errors.Wrap(err, "client.GetObject")
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}
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// make sure that the object is closed properly.
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defer func() {
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e := obj.Close()
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be.sem.ReleaseToken()
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if err == nil {
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err = errors.Wrap(e, "Close")
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}
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}()
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fi, err := obj.Stat()
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if err != nil {
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debug.Log("Stat() err %v", err)
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return restic.FileInfo{}, errors.Wrap(err, "Stat")
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}
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return restic.FileInfo{Size: fi.Size, Name: h.Name}, 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 *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
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found := false
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objName := be.Filename(h)
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be.sem.GetToken()
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_, err := be.client.StatObject(be.cfg.Bucket, objName, minio.StatObjectOptions{})
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be.sem.ReleaseToken()
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if err == nil {
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found = true
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}
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// If error, then not found
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return found, nil
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}
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// Remove removes the blob with the given name and type.
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func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
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objName := be.Filename(h)
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be.sem.GetToken()
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err := be.client.RemoveObject(be.cfg.Bucket, objName)
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be.sem.ReleaseToken()
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debug.Log("Remove(%v) at %v -> err %v", h, objName, err)
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if be.IsNotExist(err) {
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err = nil
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}
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return errors.Wrap(err, "client.RemoveObject")
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}
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// List runs fn for each file in the backend which has the type t. When an
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// error occurs (or fn returns an error), List stops and returns it.
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func (be *Backend) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
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debug.Log("listing %v", t)
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prefix, recursive := be.Basedir(t)
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// make sure prefix ends with a slash
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if !strings.HasSuffix(prefix, "/") {
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prefix += "/"
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}
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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// NB: unfortunately we can't protect this with be.sem.GetToken() here.
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// Doing so would enable a deadlock situation (gh-1399), as ListObjects()
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// starts its own goroutine and returns results via a channel.
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listresp := be.client.ListObjects(be.cfg.Bucket, prefix, recursive, ctx.Done())
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for obj := range listresp {
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m := strings.TrimPrefix(obj.Key, prefix)
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if m == "" {
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continue
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}
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fi := restic.FileInfo{
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Name: path.Base(m),
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Size: obj.Size,
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}
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if ctx.Err() != nil {
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return ctx.Err()
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}
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err := fn(fi)
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if err != nil {
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return err
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}
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if ctx.Err() != nil {
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return ctx.Err()
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}
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}
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return ctx.Err()
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}
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// Remove keys for a specified backend type.
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func (be *Backend) removeKeys(ctx context.Context, t restic.FileType) error {
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return be.List(ctx, restic.DataFile, func(fi restic.FileInfo) error {
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return be.Remove(ctx, restic.Handle{Type: t, Name: fi.Name})
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})
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}
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// Delete removes all restic keys in the bucket. It will not remove the bucket itself.
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func (be *Backend) 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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return be.Remove(ctx, restic.Handle{Type: restic.ConfigFile})
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}
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// Close does nothing
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func (be *Backend) Close() error { return nil }
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// Rename moves a file based on the new layout l.
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func (be *Backend) Rename(h restic.Handle, l backend.Layout) error {
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debug.Log("Rename %v to %v", h, l)
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oldname := be.Filename(h)
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newname := l.Filename(h)
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if oldname == newname {
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debug.Log(" %v is already renamed", newname)
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return nil
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}
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debug.Log(" %v -> %v", oldname, newname)
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src := minio.NewSourceInfo(be.cfg.Bucket, oldname, nil)
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dst, err := minio.NewDestinationInfo(be.cfg.Bucket, newname, nil, nil)
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if err != nil {
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return errors.Wrap(err, "NewDestinationInfo")
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}
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err = be.client.CopyObject(dst, src)
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if err != nil && be.IsNotExist(err) {
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debug.Log("copy failed: %v, seems to already have been renamed", err)
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return nil
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}
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if err != nil {
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debug.Log("copy failed: %v", err)
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return err
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}
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return be.client.RemoveObject(be.cfg.Bucket, oldname)
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}
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