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adapter.go
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adapter.go
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package transient
import (
"context"
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"io"
"net/http"
"net/url"
"time"
"github.com/google/uuid"
"github.com/treeverse/lakefs/pkg/block"
)
type Adapter struct{}
func New(_ context.Context) *Adapter {
return &Adapter{}
}
func (a *Adapter) Put(_ context.Context, _ block.ObjectPointer, _ int64, reader io.Reader, _ block.PutOpts) error {
_, err := io.Copy(io.Discard, reader)
return err
}
func (a *Adapter) Get(_ context.Context, _ block.ObjectPointer, expectedSize int64) (io.ReadCloser, error) {
if expectedSize < 0 {
return nil, io.ErrUnexpectedEOF
}
return io.NopCloser(&io.LimitedReader{R: rand.Reader, N: expectedSize}), nil
}
func (a *Adapter) GetWalker(_ *url.URL) (block.Walker, error) {
return nil, block.ErrOperationNotSupported
}
func (a *Adapter) GetPreSignedURL(_ context.Context, _ block.ObjectPointer, _ block.PreSignMode) (string, time.Time, error) {
return "", time.Time{}, block.ErrOperationNotSupported
}
func (a *Adapter) Exists(_ context.Context, _ block.ObjectPointer) (bool, error) {
return true, nil
}
func (a *Adapter) GetRange(_ context.Context, _ block.ObjectPointer, startPosition int64, endPosition int64) (io.ReadCloser, error) {
n := endPosition - startPosition
if n < 0 {
return nil, io.ErrUnexpectedEOF
}
reader := &io.LimitedReader{
R: rand.Reader,
N: n,
}
return io.NopCloser(reader), nil
}
func (a *Adapter) GetProperties(_ context.Context, _ block.ObjectPointer) (block.Properties, error) {
return block.Properties{}, nil
}
func (a *Adapter) Remove(_ context.Context, _ block.ObjectPointer) error {
return nil
}
func (a *Adapter) Copy(_ context.Context, _, _ block.ObjectPointer) error {
return nil
}
func (a *Adapter) UploadCopyPart(_ context.Context, _, _ block.ObjectPointer, _ string, _ int) (*block.UploadPartResponse, error) {
h := sha256.New()
code := h.Sum(nil)
etag := hex.EncodeToString(code)
return &block.UploadPartResponse{
ETag: etag,
}, nil
}
func (a *Adapter) UploadCopyPartRange(_ context.Context, _, _ block.ObjectPointer, _ string, _ int, startPosition, endPosition int64) (*block.UploadPartResponse, error) {
n := endPosition - startPosition
if n < 0 {
return nil, io.ErrUnexpectedEOF
}
h := sha256.New()
code := h.Sum(nil)
etag := hex.EncodeToString(code)
return &block.UploadPartResponse{
ETag: etag,
}, nil
}
func (a *Adapter) CreateMultiPartUpload(_ context.Context, _ block.ObjectPointer, _ *http.Request, _ block.CreateMultiPartUploadOpts) (*block.CreateMultiPartUploadResponse, error) {
uid := uuid.New()
uploadID := hex.EncodeToString(uid[:])
return &block.CreateMultiPartUploadResponse{
UploadID: uploadID,
}, nil
}
func (a *Adapter) UploadPart(_ context.Context, _ block.ObjectPointer, _ int64, reader io.Reader, _ string, _ int) (*block.UploadPartResponse, error) {
data, err := io.ReadAll(reader)
if err != nil {
return nil, err
}
h := sha256.New()
_, err = h.Write(data)
if err != nil {
return nil, err
}
code := h.Sum(nil)
etag := hex.EncodeToString(code)
return &block.UploadPartResponse{
ETag: etag,
}, nil
}
func (a *Adapter) AbortMultiPartUpload(context.Context, block.ObjectPointer, string) error {
return nil
}
func (a *Adapter) CompleteMultiPartUpload(context.Context, block.ObjectPointer, string, *block.MultipartUploadCompletion) (*block.CompleteMultiPartUploadResponse, error) {
const dataSize = 1024
data := make([]byte, dataSize)
if _, err := rand.Read(data); err != nil {
return nil, err
}
h := sha256.New()
_, err := h.Write(data)
if err != nil {
return nil, err
}
code := h.Sum(nil)
codeHex := hex.EncodeToString(code)
return &block.CompleteMultiPartUploadResponse{
ETag: codeHex,
ContentLength: dataSize,
}, nil
}
func (a *Adapter) BlockstoreType() string {
return block.BlockstoreTypeTransient
}
func (a *Adapter) GetStorageNamespaceInfo() block.StorageNamespaceInfo {
info := block.DefaultStorageNamespaceInfo(block.BlockstoreTypeTransient)
info.PreSignSupport = false
info.PreSignSupportUI = false
info.ImportSupport = false
return info
}
func (a *Adapter) ResolveNamespace(storageNamespace, key string, identifierType block.IdentifierType) (block.QualifiedKey, error) {
return block.DefaultResolveNamespace(storageNamespace, key, identifierType)
}
func (a *Adapter) RuntimeStats() map[string]string {
return nil
}
func (a *Adapter) GetPresignUploadPartURL(ctx context.Context, obj block.ObjectPointer, uploadID string, partNumber int) (string, error) {
return "", block.ErrOperationNotSupported
}