feat(store): support pruning store

node/full.go

@@ -94,7 +94,7 @@ func newFullNode(
 		return nil, err
 	}
 
-	rktStore := store.New(mainKV)
+	rktStore := store.NewAsyncPruningStore(mainKV, nodeConfig.Node.Pruning)
 
 	blockManager, err := initBlockManager(
 		ctx,

node/light.go

@@ -45,7 +45,7 @@ func newLightNode(
 		return nil, fmt.Errorf("error while initializing HeaderSyncService: %w", err)
 	}
 
-	store := store.New(database)
+	store := store.NewAsyncPruningStore(database, conf.Node.Pruning)
 
 	node := &LightNode{
 		P2P:          p2pClient,

pkg/cmd/run_node.go

@@ -33,6 +33,11 @@ func ParseConfig(cmd *cobra.Command) (rollconf.Config, error) {
 		return rollconf.Config{}, fmt.Errorf("failed to load node config: %w", err)
 	}
 
+	if nodeConfig.Node.Pruning.Strategy != rollconf.PruningConfigStrategyCustom {
+		pruningConfig := rollconf.GetPruningConfigFromStrategy(nodeConfig.Node.Pruning.Strategy)
+		nodeConfig.Node.Pruning = pruningConfig
+	}
+
 	if err := nodeConfig.Validate(); err != nil {
 		return rollconf.Config{}, fmt.Errorf("failed to validate node config: %w", err)
 	}

pkg/config/config.go

@@ -169,6 +169,9 @@ type NodeConfig struct {
 
 	// Header configuration
 	TrustedHash string `mapstructure:"trusted_hash" yaml:"trusted_hash" comment:"Initial trusted hash used to bootstrap the header exchange service. Allows nodes to start synchronizing from a specific trusted point in the chain instead of genesis. When provided, the node will fetch the corresponding header/block from peers using this hash and use it as a starting point for synchronization. If not provided, the node will attempt to fetch the genesis block instead."`
+
+	// Pruning management configuration
+	Pruning PruningConfig `mapstructure:"pruning" yaml:"pruning"`
 }
 
 // LogConfig contains all logging configuration parameters
@@ -209,6 +212,10 @@ func (c *Config) Validate() error {
 		return fmt.Errorf("could not create directory %q: %w", fullDir, err)
 	}
 
+	if err := c.Node.Pruning.Validate(); err != nil {
+		return fmt.Errorf("invalid pruning configuration: %w", err)
+	}
+
 	return nil
 }
 
@@ -244,6 +251,11 @@ func AddFlags(cmd *cobra.Command) {
 	cmd.Flags().Uint64(FlagMaxPendingHeaders, def.Node.MaxPendingHeaders, "maximum headers pending DA confirmation before pausing block production (0 for no limit)")
 	cmd.Flags().Duration(FlagLazyBlockTime, def.Node.LazyBlockInterval.Duration, "maximum interval between blocks in lazy aggregation mode")
 
+	// Pruning configuration flags
+	cmd.Flags().String(FlagPruningStrategy, def.Node.Pruning.Strategy, "pruning strategy (none, default, everything, custom)")
+	cmd.Flags().Uint64(FlagPruningKeepRecent, def.Node.Pruning.KeepRecent, "number of recent blocks to keep")
+	cmd.Flags().Uint64(FlagPruningInterval, def.Node.Pruning.Interval, "frequency of pruning operations")
+
 	// Data Availability configuration flags
 	cmd.Flags().String(FlagDAAddress, def.DA.Address, "DA address (host:port)")
 	cmd.Flags().String(FlagDAAuthToken, def.DA.AuthToken, "DA auth token")

pkg/config/defaults.go

@@ -51,6 +51,7 @@ var DefaultConfig = Config{
 		LazyBlockInterval: DurationWrapper{60 * time.Second},
 		Light:             false,
 		TrustedHash:       "",
+		Pruning:           PruningConfigDefault,
 	},
 	DA: DAConfig{
 		Address:       "http://localhost:7980",

pkg/config/pruning_config.go

@@ -0,0 +1,85 @@
+package config
+
+import (
+	"errors"
+)
+
+const (
+	// Pruning configuration flags
+
+	// FlagPruningStrategy is a flag for specifying strategy for pruning block store
+	FlagPruningStrategy = "rollkit.node.pruning.strategy"
+	// FlagPruningKeepRecent is a flag for specifying how many blocks need to keep in store
+	FlagPruningKeepRecent = "rollkit.node.pruning.keep_recent"
+	// FlagPruningInterval is a flag for specifying how often prune blocks store
+	FlagPruningInterval = "rollkit.node.pruning.interval"
+)
+
+const (
+	PruningConfigStrategyNone       = "none"
+	PruningConfigStrategyDefault    = "default"
+	PruningConfigStrategyEverything = "everything"
+	PruningConfigStrategyCustom     = "custom"
+)
+
+var (
+	PruningConfigNone = PruningConfig{
+		Strategy:   PruningConfigStrategyNone,
+		KeepRecent: 0,
+		Interval:   0,
+	}
+	PruningConfigDefault = PruningConfig{
+		Strategy:   PruningConfigStrategyDefault,
+		KeepRecent: 362880,
+		Interval:   10,
+	}
+	PruningConfigEverything = PruningConfig{
+		Strategy:   PruningConfigStrategyEverything,
+		KeepRecent: 2,
+		Interval:   10,
+	}
+	PruningConfigCustom = PruningConfig{
+		Strategy:   PruningConfigStrategyCustom,
+		KeepRecent: 100,
+		Interval:   100,
+	}
+)
+
+// PruningConfig allows node operators to manage storage
+type PruningConfig struct {
+	// todo: support volume-based strategy
+	Strategy   string `mapstructure:"strategy" yaml:"strategy" comment:"Strategy determines the pruning approach (none, default, everything, custom)"`
+	KeepRecent uint64 `mapstructure:"keep_recent" yaml:"keep_recent" comment:"Number of recent blocks to keep, used in \"custom\" strategy, must be greater or equal than 2"`
+	Interval   uint64 `mapstructure:"interval" yaml:"interval" comment:"How often the pruning process should run, used in \"custom\" strategy"`
+
+	// todo: support volume-based strategy
+	// VolumeConfig specifies configuration for volume-based storage
+	// VolumeConfig *VolumeStorageConfig `mapstructure:"volume_config" yaml:"volume_config"`
+}
+
+func (p PruningConfig) Validate() error {
+	// Only Custom strategy requires validation.
+	if p.Strategy != PruningConfigStrategyCustom {
+		return nil
+	}
+
+	if p.KeepRecent < 2 {
+		return errors.New("keep_recent must be greater or equal than 2 for custom pruning strategy")
+	}
+
+	return nil
+}
+
+func GetPruningConfigFromStrategy(strategy string) PruningConfig {
+	switch strategy {
+	case PruningConfigStrategyDefault:
+		return PruningConfigDefault
+	case PruningConfigStrategyEverything:
+		return PruningConfigEverything
+	case PruningConfigStrategyCustom:
+		return PruningConfigCustom
+	}
+
+	// Return strategy "none" if unknown.
+	return PruningConfigNone
+}

pkg/store/pruning.go

@@ -0,0 +1,102 @@
+package store
+
+import (
+	"context"
+	"time"
+
+	ds "github.com/ipfs/go-datastore"
+
+	"github.com/rollkit/rollkit/pkg/config"
+	"github.com/rollkit/rollkit/types"
+)
+
+const DefaultFlushInterval = 1 * time.Second
+
+type defaultPruningStore struct {
+	Store
+
+	Config config.PruningConfig
+}
+
+var _ PruningStore = &defaultPruningStore{}
+
+// newDefaultPruningStore returns default pruning store.
+func newDefaultPruningStore(ds ds.Batching, config config.PruningConfig) PruningStore {
+	return &defaultPruningStore{
+		Store:  &DefaultStore{db: ds},
+		Config: config,
+	}
+}
+
+func (s *defaultPruningStore) PruneBlockData(ctx context.Context, height uint64) error {
+	// Skip if strategy is none.
+	if s.Config.Strategy == config.PruningConfigStrategyNone {
+		return nil
+	}
+
+	// Skip if not the correct interval or latest height is less or equal than number of blocks need to keep.
+	if height%s.Config.Interval != 0 || height < s.Config.KeepRecent {
+		return nil
+	}
+
+	// Must keep at least 2 blocks(while strategy is everything).
+	endHeight := height + 1 - s.Config.KeepRecent
+	startHeight := uint64(0)
+	if endHeight > s.Config.Interval {
+		startHeight = endHeight - s.Config.Interval
+	}
+
+	for i := startHeight; i < endHeight; i++ {
+		// Could ignore for errors like not found.
+		_ = s.DeleteBlockData(ctx, i)
+	}
+
+	return nil
+}
+
+type AsyncPruningStore struct {
+	PruningStore
+
+	latestBlockDataHeight uint64
+	flushInterval         time.Duration
+}
+
+var _ PruningStore = &AsyncPruningStore{}
+
+func NewAsyncPruningStore(ds ds.Batching, config config.PruningConfig) *AsyncPruningStore {
+	pruningStore := newDefaultPruningStore(ds, config)
+
+	// todo: initialize latestBlockDataHeight from the store
+	return &AsyncPruningStore{
+		PruningStore: pruningStore,
+
+		flushInterval: DefaultFlushInterval,
+	}
+}
+
+// SaveBlockData saves the block data and updates the latest block data height.
+func (s *AsyncPruningStore) SaveBlockData(ctx context.Context, header *types.SignedHeader, data *types.Data, signature *types.Signature) error {
+	err := s.PruningStore.SaveBlockData(ctx, header, data, signature)
+	if err == nil {
+		s.latestBlockDataHeight = header.Height()
+	}
+
+	return err
+}
+
+// Start begins the pruning process at the specified interval.
+func (s *AsyncPruningStore) Start(ctx context.Context) {
+	// todo: use ctx for cancellation
+	ticker := time.NewTicker(s.flushInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			// Currently PruneBlockData only returns nil.
+			_ = s.PruneBlockData(ctx, s.latestBlockDataHeight)
+		}
+	}
+}

pkg/store/store.go

@@ -92,7 +92,7 @@ func (s *DefaultStore) SaveBlockData(ctx context.Context, header *types.SignedHe
 
 	batch, err := s.db.Batch(ctx)
 	if err != nil {
-		return fmt.Errorf("failed to create a new batch: %w", err)
+		return fmt.Errorf("failed to create a new batch for saving block data: %w", err)
 	}
 
 	if err := batch.Put(ctx, ds.NewKey(getHeaderKey(height)), headerBlob); err != nil {
@@ -114,6 +114,31 @@ func (s *DefaultStore) SaveBlockData(ctx context.Context, header *types.SignedHe
 	return nil
 }
 
+// DeleteBlockData deletes block at given height.
+func (s *DefaultStore) DeleteBlockData(ctx context.Context, height uint64) error {
+	batch, err := s.db.Batch(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to create a new batch for deleting block data: %w", err)
+	}
+
+	if err := batch.Delete(ctx, ds.NewKey(getHeaderKey(height))); err != nil {
+		return fmt.Errorf("failed to delete header blob in batch: %w", err)
+	}
+	if err := batch.Delete(ctx, ds.NewKey(getDataKey(height))); err != nil {
+		return fmt.Errorf("failed to delete data blob in batch: %w", err)
+	}
+	if err := batch.Delete(ctx, ds.NewKey(getSignatureKey(height))); err != nil {
+		return fmt.Errorf("failed to delete signature of block blob in batch: %w", err)
+	}
+	if err := batch.Commit(ctx); err != nil {
+		return fmt.Errorf("failed to commit batch: %w", err)
+	}
+
+	return nil
+}
+
+// TODO: We unmarshal the header and data here, but then we re-marshal them to proto to hash or send them to DA, we should not unmarshal them here and allow the caller to handle them as needed.
+
 // GetBlockData returns block header and data at given height, or error if it's not found in Store.
 func (s *DefaultStore) GetBlockData(ctx context.Context, height uint64) (*types.SignedHeader, *types.Data, error) {
 	headerBlob, err := s.db.Get(ctx, ds.NewKey(getHeaderKey(height)))

pkg/store/types.go

@@ -14,10 +14,12 @@ type Store interface {
 	// SetHeight sets the height saved in the Store if it is higher than the existing height.
 	SetHeight(ctx context.Context, height uint64) error
 
-	// SaveBlock saves block along with its seen signature (which will be included in the next block).
+	// SaveBlockData saves block along with its seen signature (which will be included in the next block).
 	SaveBlockData(ctx context.Context, header *types.SignedHeader, data *types.Data, signature *types.Signature) error
+	// DeleteBlockData deletes block at given height.
+	DeleteBlockData(ctx context.Context, height uint64) error
 
-	// GetBlock returns block at given height, or error if it's not found in Store.
+	// GetBlockData returns block at given height, or error if it's not found in Store.
 	GetBlockData(ctx context.Context, height uint64) (*types.SignedHeader, *types.Data, error)
 	// GetBlockByHash returns block with given block header hash, or error if it's not found in Store.
 	GetBlockByHash(ctx context.Context, hash []byte) (*types.SignedHeader, *types.Data, error)
@@ -44,3 +46,9 @@ type Store interface {
 	// Close safely closes underlying data storage, to ensure that data is actually saved.
 	Close() error
 }
+
+type PruningStore interface {
+	Store
+
+	PruneBlockData(ctx context.Context, height uint64) error
+}