Beispiel #1
0
func (bs *blockstore) Get(k *cid.Cid) (blocks.Block, error) {
	if k == nil {
		log.Error("nil cid in blockstore")
		return nil, ErrNotFound
	}

	maybeData, err := bs.datastore.Get(dshelp.CidToDsKey(k))
	if err == ds.ErrNotFound {
		return nil, ErrNotFound
	}
	if err != nil {
		return nil, err
	}
	bdata, ok := maybeData.([]byte)
	if !ok {
		return nil, ValueTypeMismatch
	}

	if bs.rehash {
		rbcid, err := k.Prefix().Sum(bdata)
		if err != nil {
			return nil, err
		}

		if !rbcid.Equals(k) {
			return nil, ErrHashMismatch
		}

		return blocks.NewBlockWithCid(bdata, rbcid)
	} else {
		return blocks.NewBlockWithCid(bdata, k)
	}
}
Beispiel #2
0
// NewBlockWithHash creates a new block when the hash of the data
// is already known, this is used to save time in situations where
// we are able to be confident that the data is correct
func NewBlockWithCid(data []byte, c *cid.Cid) (*BasicBlock, error) {
	if u.Debug {
		chkc, err := c.Prefix().Sum(data)
		if err != nil {
			return nil, err
		}

		if !chkc.Equals(c) {
			return nil, ErrWrongHash
		}
	}
	return &BasicBlock{data: data, cid: c}, nil
}