175 lines
3.4 KiB
Go
175 lines
3.4 KiB
Go
package blockstore
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import (
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"context"
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"os"
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block "github.com/ipfs/go-block-format"
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"github.com/ipfs/go-cid"
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)
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// buflog is a logger for the buffered blockstore. It is subscoped from the
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// blockstore logger.
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var buflog = log.Named("buf")
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type BufferedBlockstore struct {
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read Blockstore
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write Blockstore
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}
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func NewBuffered(base Blockstore) *BufferedBlockstore {
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var buf Blockstore
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if os.Getenv("LOTUS_DISABLE_VM_BUF") == "iknowitsabadidea" {
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buflog.Warn("VM BLOCKSTORE BUFFERING IS DISABLED")
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buf = base
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} else {
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buf = NewMemory()
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}
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bs := &BufferedBlockstore{
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read: base,
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write: buf,
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}
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return bs
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}
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func NewTieredBstore(r Blockstore, w Blockstore) *BufferedBlockstore {
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return &BufferedBlockstore{
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read: r,
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write: w,
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}
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}
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var (
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_ Blockstore = (*BufferedBlockstore)(nil)
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_ Viewer = (*BufferedBlockstore)(nil)
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)
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func (bs *BufferedBlockstore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
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a, err := bs.read.AllKeysChan(ctx)
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if err != nil {
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return nil, err
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}
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b, err := bs.write.AllKeysChan(ctx)
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if err != nil {
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return nil, err
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}
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out := make(chan cid.Cid)
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go func() {
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defer close(out)
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for a != nil || b != nil {
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select {
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case val, ok := <-a:
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if !ok {
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a = nil
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} else {
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select {
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case out <- val:
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case <-ctx.Done():
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return
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}
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}
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case val, ok := <-b:
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if !ok {
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b = nil
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} else {
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select {
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case out <- val:
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case <-ctx.Done():
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return
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}
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}
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}
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}
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}()
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return out, nil
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}
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func (bs *BufferedBlockstore) DeleteBlock(ctx context.Context, c cid.Cid) error {
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if err := bs.read.DeleteBlock(ctx, c); err != nil {
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return err
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}
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return bs.write.DeleteBlock(ctx, c)
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}
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func (bs *BufferedBlockstore) DeleteMany(ctx context.Context, cids []cid.Cid) error {
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if err := bs.read.DeleteMany(ctx, cids); err != nil {
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return err
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}
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return bs.write.DeleteMany(ctx, cids)
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}
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func (bs *BufferedBlockstore) View(ctx context.Context, c cid.Cid, callback func([]byte) error) error {
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// both stores are viewable.
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if err := bs.write.View(ctx, c, callback); err == ErrNotFound {
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// not found in write blockstore; fall through.
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} else {
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return err // propagate errors, or nil, i.e. found.
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}
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return bs.read.View(ctx, c, callback)
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}
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func (bs *BufferedBlockstore) Get(ctx context.Context, c cid.Cid) (block.Block, error) {
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if out, err := bs.write.Get(ctx, c); err != nil {
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if err != ErrNotFound {
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return nil, err
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}
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} else {
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return out, nil
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}
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return bs.read.Get(ctx, c)
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}
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func (bs *BufferedBlockstore) GetSize(ctx context.Context, c cid.Cid) (int, error) {
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s, err := bs.read.GetSize(ctx, c)
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if err == ErrNotFound || s == 0 {
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return bs.write.GetSize(ctx, c)
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}
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return s, err
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}
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func (bs *BufferedBlockstore) Put(ctx context.Context, blk block.Block) error {
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has, err := bs.read.Has(ctx, blk.Cid()) // TODO: consider dropping this check
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if err != nil {
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return err
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}
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if has {
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return nil
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}
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return bs.write.Put(ctx, blk)
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}
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func (bs *BufferedBlockstore) Has(ctx context.Context, c cid.Cid) (bool, error) {
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has, err := bs.write.Has(ctx, c)
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if err != nil {
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return false, err
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}
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if has {
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return true, nil
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}
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return bs.read.Has(ctx, c)
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}
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func (bs *BufferedBlockstore) HashOnRead(hor bool) {
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bs.read.HashOnRead(hor)
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bs.write.HashOnRead(hor)
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}
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func (bs *BufferedBlockstore) PutMany(ctx context.Context, blks []block.Block) error {
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return bs.write.PutMany(ctx, blks)
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}
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func (bs *BufferedBlockstore) Read() Blockstore {
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return bs.read
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}
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