mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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316 lines
8.4 KiB
Go
316 lines
8.4 KiB
Go
package s3remote
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"strings"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/backup/common"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/backup/fscommon"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/s3"
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"github.com/aws/aws-sdk-go/service/s3/s3manager"
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)
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// FS represents filesystem for backups in S3.
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//
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// Init must be called before calling other FS methods.
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type FS struct {
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// Path to S3 credentials file.
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CredsFilePath string
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// Path to S3 configs file.
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ConfigFilePath string
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// GCS bucket to use.
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Bucket string
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// Directory in the bucket to write to.
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Dir string
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// Set for using S3-compatible enpoint such as MinIO etc.
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CustomEndpoint string
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// The name of S3 config profile to use.
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ProfileName string
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s3 *s3.S3
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uploader *s3manager.Uploader
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}
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// Init initializes fs.
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func (fs *FS) Init() error {
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if fs.s3 != nil {
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logger.Panicf("BUG: Init is already called")
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}
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for strings.HasPrefix(fs.Dir, "/") {
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fs.Dir = fs.Dir[1:]
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}
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if !strings.HasSuffix(fs.Dir, "/") {
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fs.Dir += "/"
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}
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opts := session.Options{
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SharedConfigState: session.SharedConfigEnable,
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Profile: fs.ProfileName,
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}
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if len(fs.CredsFilePath) > 0 {
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opts.SharedConfigFiles = []string{
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fs.ConfigFilePath,
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fs.CredsFilePath,
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}
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}
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sess, err := session.NewSessionWithOptions(opts)
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if err != nil {
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return fmt.Errorf("cannot create S3 session: %w", err)
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}
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if len(fs.CustomEndpoint) > 0 {
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// Use provided custom endpoint for S3
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logger.Infof("Using provided custom S3 endpoint: %q", fs.CustomEndpoint)
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sess.Config.WithEndpoint(fs.CustomEndpoint)
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// Disable prefixing endpoint with bucket name
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sess.Config.WithS3ForcePathStyle(true)
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} else {
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// Determine bucket region.
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ctx := context.Background()
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region, err := s3manager.GetBucketRegion(ctx, sess, fs.Bucket, "us-west-2")
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if err != nil {
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return fmt.Errorf("cannot determine region for bucket %q: %w", fs.Bucket, err)
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}
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sess.Config.WithRegion(region)
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logger.Infof("bucket %q is stored at region %q; switching to this region", fs.Bucket, region)
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}
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fs.s3 = s3.New(sess)
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fs.uploader = s3manager.NewUploader(sess, func(u *s3manager.Uploader) {
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// We manage upload concurrency by ourselves.
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u.Concurrency = 1
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})
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return nil
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}
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// String returns human-readable description for fs.
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func (fs *FS) String() string {
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return fmt.Sprintf("S3{bucket: %q, dir: %q}", fs.Bucket, fs.Dir)
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}
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// ListParts returns all the parts for fs.
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func (fs *FS) ListParts() ([]common.Part, error) {
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dir := fs.Dir
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input := &s3.ListObjectsV2Input{
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Bucket: aws.String(fs.Bucket),
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Prefix: aws.String(dir),
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}
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var errOuter error
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var parts []common.Part
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err := fs.s3.ListObjectsV2Pages(input, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
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for _, o := range page.Contents {
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file := *o.Key
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if !strings.HasPrefix(file, dir) {
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errOuter = fmt.Errorf("unexpected prefix for s3 key %q; want %q", file, dir)
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return false
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}
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if fscommon.IgnorePath(file) {
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continue
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}
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var p common.Part
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if !p.ParseFromRemotePath(file[len(dir):]) {
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logger.Infof("skipping unknown object %q", file)
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continue
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}
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p.ActualSize = uint64(*o.Size)
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parts = append(parts, p)
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}
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return !lastPage
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})
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if errOuter != nil && err == nil {
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err = errOuter
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}
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if err != nil {
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return nil, fmt.Errorf("error when listing s3 objects inside dir %q: %w", dir, err)
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}
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return parts, nil
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}
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// DeletePart deletes part p from fs.
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func (fs *FS) DeletePart(p common.Part) error {
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path := fs.path(p)
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input := &s3.DeleteObjectInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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}
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_, err := fs.s3.DeleteObject(input)
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if err != nil {
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return fmt.Errorf("cannot delete %q at %s (remote path %q): %w", p.Path, fs, path, err)
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}
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return nil
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}
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// RemoveEmptyDirs recursively removes empty dirs in fs.
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func (fs *FS) RemoveEmptyDirs() error {
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// S3 has no directories, so nothing to remove.
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return nil
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}
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// CopyPart copies p from srcFS to fs.
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func (fs *FS) CopyPart(srcFS common.OriginFS, p common.Part) error {
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src, ok := srcFS.(*FS)
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if !ok {
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return fmt.Errorf("cannot perform server-side copying from %s to %s: both of them must be S3", srcFS, fs)
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}
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srcPath := src.path(p)
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dstPath := fs.path(p)
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copySource := fmt.Sprintf("/%s/%s", src.Bucket, srcPath)
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input := &s3.CopyObjectInput{
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Bucket: aws.String(fs.Bucket),
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CopySource: aws.String(copySource),
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Key: aws.String(dstPath),
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}
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_, err := fs.s3.CopyObject(input)
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if err != nil {
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return fmt.Errorf("cannot copy %q from %s to %s (copySource %q): %w", p.Path, src, fs, copySource, err)
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}
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return nil
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}
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// DownloadPart downloads part p from fs to w.
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func (fs *FS) DownloadPart(p common.Part, w io.Writer) error {
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path := fs.path(p)
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input := &s3.GetObjectInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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}
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o, err := fs.s3.GetObject(input)
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if err != nil {
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return fmt.Errorf("cannot open %q at %s (remote path %q): %w", p.Path, fs, path, err)
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}
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r := o.Body
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n, err := io.Copy(w, r)
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if err1 := r.Close(); err1 != nil && err == nil {
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err = err1
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}
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if err != nil {
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return fmt.Errorf("cannot download %q from at %s (remote path %q): %w", p.Path, fs, path, err)
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}
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if uint64(n) != p.Size {
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return fmt.Errorf("wrong data size downloaded from %q at %s; got %d bytes; want %d bytes", p.Path, fs, n, p.Size)
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}
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return nil
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}
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// UploadPart uploads part p from r to fs.
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func (fs *FS) UploadPart(p common.Part, r io.Reader) error {
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path := fs.path(p)
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sr := &statReader{
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r: r,
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}
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input := &s3manager.UploadInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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Body: sr,
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}
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_, err := fs.uploader.Upload(input)
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if err != nil {
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return fmt.Errorf("cannot upoad data to %q at %s (remote path %q): %w", p.Path, fs, path, err)
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}
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if uint64(sr.size) != p.Size {
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return fmt.Errorf("wrong data size uploaded to %q at %s; got %d bytes; want %d bytes", p.Path, fs, sr.size, p.Size)
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}
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return nil
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}
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// DeleteFile deletes filePath from fs if it exists.
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//
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// The function does nothing if the file doesn't exist.
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func (fs *FS) DeleteFile(filePath string) error {
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// It looks like s3 may return `AccessDenied: Access Denied` instead of `s3.ErrCodeNoSuchKey`
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// on an attempt to delete non-existing file.
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// so just check whether the filePath exists before deleting it.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/284 for details.
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ok, err := fs.HasFile(filePath)
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if err != nil {
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return err
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}
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if !ok {
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// Missing file - nothing to delete.
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return nil
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}
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path := fs.Dir + filePath
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input := &s3.DeleteObjectInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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}
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if _, err := fs.s3.DeleteObject(input); err != nil {
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return fmt.Errorf("cannot delete %q at %s (remote path %q): %w", filePath, fs, path, err)
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}
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return nil
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}
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// CreateFile creates filePath at fs and puts data into it.
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//
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// The file is overwritten if it already exists.
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func (fs *FS) CreateFile(filePath string, data []byte) error {
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path := fs.Dir + filePath
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sr := &statReader{
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r: bytes.NewReader(data),
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}
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input := &s3manager.UploadInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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Body: sr,
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}
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_, err := fs.uploader.Upload(input)
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if err != nil {
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return fmt.Errorf("cannot upoad data to %q at %s (remote path %q): %w", filePath, fs, path, err)
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}
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l := int64(len(data))
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if sr.size != l {
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return fmt.Errorf("wrong data size uploaded to %q at %s; got %d bytes; want %d bytes", filePath, fs, sr.size, l)
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}
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return nil
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}
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// HasFile returns true if filePath exists at fs.
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func (fs *FS) HasFile(filePath string) (bool, error) {
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path := fs.Dir + filePath
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input := &s3.GetObjectInput{
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Bucket: aws.String(fs.Bucket),
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Key: aws.String(path),
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}
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o, err := fs.s3.GetObject(input)
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if err != nil {
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var ae awserr.Error
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if errors.As(err, &ae) && ae.Code() == s3.ErrCodeNoSuchKey {
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return false, nil
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}
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return false, fmt.Errorf("cannot open %q at %s (remote path %q): %w", filePath, fs, path, err)
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}
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if err := o.Body.Close(); err != nil {
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return false, fmt.Errorf("cannot close %q at %s (remote path %q): %w", filePath, fs, path, err)
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}
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return true, nil
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}
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func (fs *FS) path(p common.Part) string {
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return p.RemotePath(fs.Dir)
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}
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type statReader struct {
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r io.Reader
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size int64
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}
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func (sr *statReader) Read(p []byte) (int, error) {
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n, err := sr.r.Read(p)
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sr.size += int64(n)
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return n, err
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}
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