3795cc2bd2
This paves the way for better object lifetime management. Concretely, it makes it possible to: - have different stores backing chain and state data. - having the same datastore library, but using different parameters. - attach different caching layers/policies to each class of data, e.g. sizing caches differently. - specifying different retention policies for chain and state data. This separation is important because: - access patterns/frequency of chain and state data are different. - state is derivable from chain, so one could never expunge the chain store, and only retain state objects reachable from the last finality in the state store.
66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
package modules
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import (
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"context"
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"io"
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bstore "github.com/ipfs/go-ipfs-blockstore"
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"go.uber.org/fx"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/lotus/blockstore"
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"github.com/filecoin-project/lotus/node/modules/dtypes"
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"github.com/filecoin-project/lotus/node/modules/helpers"
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"github.com/filecoin-project/lotus/node/repo"
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)
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// UniversalBlockstore returns a single universal blockstore that stores both
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// chain data and state data.
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func UniversalBlockstore(lc fx.Lifecycle, mctx helpers.MetricsCtx, r repo.LockedRepo) (dtypes.UniversalBlockstore, error) {
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bs, err := r.Blockstore(helpers.LifecycleCtx(mctx, lc), repo.UniversalBlockstore)
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if err != nil {
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return nil, err
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}
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if c, ok := bs.(io.Closer); ok {
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lc.Append(fx.Hook{
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OnStop: func(_ context.Context) error {
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return c.Close()
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},
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})
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}
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return bs, err
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}
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// StateBlockstore is a hook to overlay caches for state objects, or in the
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// future, to segregate the universal blockstore into different physical state
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// and chain stores.
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func StateBlockstore(lc fx.Lifecycle, mctx helpers.MetricsCtx, bs dtypes.UniversalBlockstore) (dtypes.StateBlockstore, error) {
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return bs, nil
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}
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// ChainBlockstore is a hook to overlay caches for state objects, or in the
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// future, to segregate the universal blockstore into different physical state
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// and chain stores.
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func ChainBlockstore(lc fx.Lifecycle, mctx helpers.MetricsCtx, bs dtypes.UniversalBlockstore) (dtypes.ChainBlockstore, error) {
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return bs, nil
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}
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func FallbackChainBlockstore(cbs dtypes.ChainBlockstore) dtypes.ChainBlockstore {
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return &blockstore.FallbackStore{Blockstore: cbs}
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}
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func FallbackStateBlockstore(sbs dtypes.StateBlockstore) dtypes.StateBlockstore {
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return &blockstore.FallbackStore{Blockstore: sbs}
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}
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func InitFallbackBlockstores(cbs dtypes.ChainBlockstore, sbs dtypes.StateBlockstore, rem dtypes.ChainBitswap) error {
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for _, bs := range []bstore.Blockstore{cbs, sbs} {
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if fbs, ok := bs.(*blockstore.FallbackStore); ok {
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fbs.SetFallback(rem.GetBlock)
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continue
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}
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return xerrors.Errorf("expected a FallbackStore")
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}
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return nil
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}
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