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idstore.go
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idstore.go
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package blockstore
import (
"context"
"io"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
mh "github.com/multiformats/go-multihash"
"golang.org/x/xerrors"
)
var _ Blockstore = (*idstore)(nil)
type idstore struct {
bs Blockstore
}
func NewIDStore(bs Blockstore) Blockstore {
return &idstore{bs: bs}
}
func decodeCid(cid cid.Cid) (inline bool, data []byte, err error) {
if cid.Prefix().MhType != mh.IDENTITY {
return false, nil, nil
}
dmh, err := mh.Decode(cid.Hash())
if err != nil {
return false, nil, err
}
if dmh.Code == mh.IDENTITY {
return true, dmh.Digest, nil
}
return false, nil, err
}
func (b *idstore) Has(ctx context.Context, cid cid.Cid) (bool, error) {
inline, _, err := decodeCid(cid)
if err != nil {
return false, xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return true, nil
}
return b.bs.Has(ctx, cid)
}
func (b *idstore) Get(ctx context.Context, cid cid.Cid) (blocks.Block, error) {
inline, data, err := decodeCid(cid)
if err != nil {
return nil, xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return blocks.NewBlockWithCid(data, cid)
}
return b.bs.Get(ctx, cid)
}
func (b *idstore) GetSize(ctx context.Context, cid cid.Cid) (int, error) {
inline, data, err := decodeCid(cid)
if err != nil {
return 0, xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return len(data), err
}
return b.bs.GetSize(ctx, cid)
}
func (b *idstore) View(ctx context.Context, cid cid.Cid, cb func([]byte) error) error {
inline, data, err := decodeCid(cid)
if err != nil {
return xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return cb(data)
}
return b.bs.View(ctx, cid, cb)
}
func (b *idstore) Put(ctx context.Context, blk blocks.Block) error {
inline, _, err := decodeCid(blk.Cid())
if err != nil {
return xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return nil
}
return b.bs.Put(ctx, blk)
}
func (b *idstore) ForEachKey(f func(cid.Cid) error) error {
iterBstore, ok := b.bs.(BlockstoreIterator)
if !ok {
return xerrors.Errorf("underlying blockstore (type %T) doesn't support fast iteration", b.bs)
}
return iterBstore.ForEachKey(f)
}
func (b *idstore) PutMany(ctx context.Context, blks []blocks.Block) error {
toPut := make([]blocks.Block, 0, len(blks))
for _, blk := range blks {
inline, _, err := decodeCid(blk.Cid())
if err != nil {
return xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
continue
}
toPut = append(toPut, blk)
}
if len(toPut) > 0 {
return b.bs.PutMany(ctx, toPut)
}
return nil
}
func (b *idstore) DeleteBlock(ctx context.Context, cid cid.Cid) error {
inline, _, err := decodeCid(cid)
if err != nil {
return xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
return nil
}
return b.bs.DeleteBlock(ctx, cid)
}
func (b *idstore) DeleteMany(ctx context.Context, cids []cid.Cid) error {
toDelete := make([]cid.Cid, 0, len(cids))
for _, cid := range cids {
inline, _, err := decodeCid(cid)
if err != nil {
return xerrors.Errorf("error decoding Cid: %w", err)
}
if inline {
continue
}
toDelete = append(toDelete, cid)
}
if len(toDelete) > 0 {
return b.bs.DeleteMany(ctx, toDelete)
}
return nil
}
func (b *idstore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
return b.bs.AllKeysChan(ctx)
}
func (b *idstore) HashOnRead(enabled bool) {
b.bs.HashOnRead(enabled)
}
func (b *idstore) Close() error {
if c, ok := b.bs.(io.Closer); ok {
return c.Close()
}
return nil
}
func (b *idstore) Flush(ctx context.Context) error {
return b.bs.Flush(ctx)
}