lotus/blockstore/mem.go

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package blockstore
import (
"context"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
ipld "github.com/ipfs/go-ipld-format"
)
// NewMemory returns a temporary memory-backed blockstore.
func NewMemory() MemBlockstore {
return make(MemBlockstore)
}
// MemBlockstore is a terminal blockstore that keeps blocks in memory.
// To match behavior of badger blockstore we index by multihash only.
type MemBlockstore map[string]blocks.Block
func (MemBlockstore) Flush(context.Context) error { return nil }
func (m MemBlockstore) DeleteBlock(ctx context.Context, k cid.Cid) error {
delete(m, string(k.Hash()))
return nil
}
func (m MemBlockstore) DeleteMany(ctx context.Context, ks []cid.Cid) error {
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for _, k := range ks {
delete(m, string(k.Hash()))
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}
return nil
}
func (m MemBlockstore) Has(ctx context.Context, k cid.Cid) (bool, error) {
_, ok := m[string(k.Hash())]
return ok, nil
}
func (m MemBlockstore) View(ctx context.Context, k cid.Cid, callback func([]byte) error) error {
b, ok := m[string(k.Hash())]
if !ok {
return ipld.ErrNotFound{Cid: k}
}
return callback(b.RawData())
}
func (m MemBlockstore) Get(ctx context.Context, k cid.Cid) (blocks.Block, error) {
b, ok := m[string(k.Hash())]
if !ok {
return nil, ipld.ErrNotFound{Cid: k}
}
if b.Cid().Prefix().Codec != k.Prefix().Codec {
return blocks.NewBlockWithCid(b.RawData(), k)
}
return b, nil
}
// GetSize returns the CIDs mapped BlockSize
func (m MemBlockstore) GetSize(ctx context.Context, k cid.Cid) (int, error) {
b, ok := m[string(k.Hash())]
if !ok {
return 0, ipld.ErrNotFound{Cid: k}
}
return len(b.RawData()), nil
}
// Put puts a given block to the underlying datastore
func (m MemBlockstore) Put(ctx context.Context, b blocks.Block) error {
// Convert to a basic block for safety, but try to reuse the existing
// block if it's already a basic block.
k := string(b.Cid().Hash())
if _, ok := b.(*blocks.BasicBlock); !ok {
// If we already have the block, abort.
if _, ok := m[k]; ok {
return nil
}
// the error is only for debugging.
b, _ = blocks.NewBlockWithCid(b.RawData(), b.Cid())
}
m[k] = b
return nil
}
// PutMany puts a slice of blocks at the same time using batching
// capabilities of the underlying datastore whenever possible.
func (m MemBlockstore) PutMany(ctx context.Context, bs []blocks.Block) error {
for _, b := range bs {
_ = m.Put(ctx, b) // can't fail
}
return nil
}
// AllKeysChan returns a channel from which
// the CIDs in the Blockstore can be read. It should respect
// the given context, closing the channel if it becomes Done.
func (m MemBlockstore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
ch := make(chan cid.Cid, len(m))
for _, b := range m {
ch <- b.Cid()
}
close(ch)
return ch, nil
}
// HashOnRead specifies if every read block should be
// rehashed to make sure it matches its CID.
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func (m MemBlockstore) HashOnRead(enabled bool) {
// no-op
}