96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
package blockstore
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import (
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cid "github.com/ipfs/go-cid"
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ds "github.com/ipfs/go-datastore"
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logging "github.com/ipfs/go-log/v2"
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blockstore "github.com/ipfs/go-ipfs-blockstore"
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)
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var log = logging.Logger("blockstore")
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var ErrNotFound = blockstore.ErrNotFound
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// Blockstore is the blockstore interface used by Lotus. It is the union
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// of the basic go-ipfs blockstore, with other capabilities required by Lotus,
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// e.g. View or Sync.
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type Blockstore interface {
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blockstore.Blockstore
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blockstore.Viewer
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BatchDeleter
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}
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// BasicBlockstore is an alias to the original IPFS Blockstore.
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type BasicBlockstore = blockstore.Blockstore
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type Viewer = blockstore.Viewer
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type BatchDeleter interface {
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DeleteMany(cids []cid.Cid) error
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}
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// WrapIDStore wraps the underlying blockstore in an "identity" blockstore.
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// The ID store filters out all puts for blocks with CIDs using the "identity"
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// hash function. It also extracts inlined blocks from CIDs using the identity
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// hash function and returns them on get/has, ignoring the contents of the
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// blockstore.
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func WrapIDStore(bstore blockstore.Blockstore) Blockstore {
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if is, ok := bstore.(*idstore); ok {
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// already wrapped
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return is
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}
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if bs, ok := bstore.(Blockstore); ok {
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// we need to wrap our own because we don't want to neuter the DeleteMany method
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// the underlying blockstore has implemented an (efficient) DeleteMany
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return NewIDStore(bs)
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}
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// The underlying blockstore does not implement DeleteMany, so we need to shim it.
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// This is less efficient as it'll iterate and perform single deletes.
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return NewIDStore(Adapt(bstore))
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}
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// FromDatastore creates a new blockstore backed by the given datastore.
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func FromDatastore(dstore ds.Batching) Blockstore {
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return WrapIDStore(blockstore.NewBlockstore(dstore))
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}
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type adaptedBlockstore struct {
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blockstore.Blockstore
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}
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var _ Blockstore = (*adaptedBlockstore)(nil)
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func (a *adaptedBlockstore) View(cid cid.Cid, callback func([]byte) error) error {
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blk, err := a.Get(cid)
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if err != nil {
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return err
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}
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return callback(blk.RawData())
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}
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func (a *adaptedBlockstore) DeleteMany(cids []cid.Cid) error {
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for _, cid := range cids {
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err := a.DeleteBlock(cid)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Adapt adapts a standard blockstore to a Lotus blockstore by
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// enriching it with the extra methods that Lotus requires (e.g. View, Sync).
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//
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// View proxies over to Get and calls the callback with the value supplied by Get.
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// Sync noops.
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func Adapt(bs blockstore.Blockstore) Blockstore {
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if ret, ok := bs.(Blockstore); ok {
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return ret
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}
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return &adaptedBlockstore{bs}
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}
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