lotus/chain/buf_bstore.go

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2019-07-05 14:29:17 +00:00
package chain
import (
"context"
block "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
ds "github.com/ipfs/go-datastore"
bstore "github.com/ipfs/go-ipfs-blockstore"
)
type BufferedBS struct {
read bstore.Blockstore
write bstore.Blockstore
}
func NewBufferedBstore(base bstore.Blockstore) *BufferedBS {
buf := bstore.NewBlockstore(ds.NewMapDatastore())
return &BufferedBS{
read: base,
write: buf,
}
}
var _ (bstore.Blockstore) = &BufferedBS{}
func (bs *BufferedBS) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
a, err := bs.read.AllKeysChan(ctx)
if err != nil {
return nil, err
}
b, err := bs.write.AllKeysChan(ctx)
if err != nil {
return nil, err
}
out := make(chan cid.Cid)
go func() {
defer close(out)
for a != nil || b != nil {
select {
case val, ok := <-a:
if !ok {
a = nil
} else {
select {
case out <- val:
case <-ctx.Done():
return
}
}
case val, ok := <-b:
if !ok {
b = nil
} else {
select {
case out <- val:
case <-ctx.Done():
return
}
}
}
}
}()
return out, nil
}
func (bs *BufferedBS) DeleteBlock(c cid.Cid) error {
if err := bs.read.DeleteBlock(c); err != nil {
return err
}
return bs.write.DeleteBlock(c)
}
func (bs *BufferedBS) Get(c cid.Cid) (block.Block, error) {
if out, err := bs.read.Get(c); err != nil {
if err != bstore.ErrNotFound {
return nil, err
}
} else {
return out, nil
}
return bs.write.Get(c)
}
func (bs *BufferedBS) GetSize(c cid.Cid) (int, error) {
panic("nyi")
}
func (bs *BufferedBS) Put(blk block.Block) error {
return bs.write.Put(blk)
}
func (bs *BufferedBS) Has(c cid.Cid) (bool, error) {
has, err := bs.read.Has(c)
if err != nil {
return false, err
}
if has {
return true, nil
}
return bs.write.Has(c)
}
func (bs *BufferedBS) HashOnRead(hor bool) {
bs.read.HashOnRead(hor)
bs.write.HashOnRead(hor)
}
func (bs *BufferedBS) PutMany(blks []block.Block) error {
return bs.write.PutMany(blks)
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}