create protocol snapshot from checkpoint file

admin/README.md

@@ -109,3 +109,8 @@ curl localhost:9002/admin/run_command -H 'Content-Type: application/json' -d '{"
 curl localhost:9002/admin/run_command -H 'Content-Type: application/json' -d '{"commandName": "ingest-tx-rate-limit", "data": { "command": "get_config" }}'
 curl localhost:9002/admin/run_command -H 'Content-Type: application/json' -d '{"commandName": "ingest-tx-rate-limit", "data": { "command": "set_config", "limit": 1, "burst": 1 }}'
 ```
+
+### To create a protocol snapshot for latest checkpoint (execution node only)
+```
+curl localhost:9002/admin/run_command -H 'Content-Type: application/json' -d '{"commandName": "protocol-snapshot"}'
+```

admin/commands/storage/read_protocol_snapshot.go

@@ -0,0 +1,95 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/rs/zerolog"
+
+	"github.com/onflow/flow-go/admin"
+	"github.com/onflow/flow-go/admin/commands"
+	"github.com/onflow/flow-go/cmd/util/common"
+	"github.com/onflow/flow-go/state/protocol"
+	"github.com/onflow/flow-go/state/protocol/inmem"
+	"github.com/onflow/flow-go/storage"
+	"github.com/onflow/flow-go/utils/logging"
+)
+
+var _ commands.AdminCommand = (*ProtocolSnapshotCommand)(nil)
+
+// ProtocolSnapshotCommand is a command that generates a protocol snapshot for a checkpoint (usually latest checkpoint)
+// This command is only available for execution node
+type ProtocolSnapshotCommand struct {
+	logger        zerolog.Logger
+	state         protocol.State
+	headers       storage.Headers
+	seals         storage.Seals
+	checkpointDir string // the directory where the checkpoint is stored
+}
+
+func NewProtocolSnapshotCommand(
+	logger zerolog.Logger,
+	state protocol.State,
+	headers storage.Headers,
+	seals storage.Seals,
+	checkpointDir string,
+) *ProtocolSnapshotCommand {
+	return &ProtocolSnapshotCommand{
+		logger:        logger,
+		state:         state,
+		headers:       headers,
+		seals:         seals,
+		checkpointDir: checkpointDir,
+	}
+}
+
+func (s *ProtocolSnapshotCommand) Handler(_ context.Context, req *admin.CommandRequest) (interface{}, error) {
+	s.logger.Info().Msgf("admintool: generating protocol snapshot")
+
+	input, ok := req.Data.(map[string]interface{})
+	if !ok {
+		return nil, admin.NewInvalidAdminReqFormatError("missing 'data' field")
+	}
+
+	// blocksToSkip is the number of blocks to skip when iterating the sealed heights to find the state commitment
+	// in the checkpoint file.
+	// default is 0
+	blocksToSkip := uint(0)
+	data, ok := input["blocks-to-skip"]
+	if ok {
+		n, ok := data.(int)
+		if ok && n > 0 {
+			blocksToSkip = uint(n)
+		}
+	}
+
+	snapshot, sealedHeight, commit, err := common.GenerateProtocolSnapshotForCheckpoint(
+		s.logger, s.state, s.headers, s.seals, s.checkpointDir, blocksToSkip)
+	if err != nil {
+		return nil, fmt.Errorf("could not generate protocol snapshot for checkpoint, checkpointDir %v: %w",
+			s.checkpointDir, err)
+	}
+
+	header, err := snapshot.Head()
+	if err != nil {
+		return nil, fmt.Errorf("could not get header from snapshot: %w", err)
+	}
+
+	serializable, err := inmem.FromSnapshot(snapshot)
+	if err != nil {
+		return nil, fmt.Errorf("could not convert snapshot to serializable: %w", err)
+	}
+
+	s.logger.Info().
+		Uint64("finalized_height", header.Height). // finalized height
+		Hex("finalized_block_id", logging.Entity(header)).
+		Uint64("sealed_height", sealedHeight).
+		Hex("sealed_commit", commit[:]). // not the commit for the finalized height, but for the sealed height
+		Msgf("admintool: protocol snapshot generated successfully")
+
+	return commands.ConvertToMap(serializable.Encodable())
+}
+
+func (s *ProtocolSnapshotCommand) Validator(_ *admin.CommandRequest) error {
+	return nil
+}

cmd/execution_builder.go

@@ -192,6 +192,15 @@ func (builder *ExecutionNodeBuilder) LoadComponentsAndModules() {
 		AdminCommand("get-transactions", func(conf *NodeConfig) commands.AdminCommand {
 			return storageCommands.NewGetTransactionsCommand(conf.State, conf.Storage.Payloads, conf.Storage.Collections)
 		}).
+		AdminCommand("protocol-snapshot", func(conf *NodeConfig) commands.AdminCommand {
+			return storageCommands.NewProtocolSnapshotCommand(
+				conf.Logger,
+				conf.State,
+				conf.Storage.Headers,
+				conf.Storage.Seals,
+				exeNode.exeConf.triedir,
+			)
+		}).
 		Module("mutable follower state", exeNode.LoadMutableFollowerState).
 		Module("system specs", exeNode.LoadSystemSpecs).
 		Module("execution metrics", exeNode.LoadExecutionMetrics).

cmd/util/cmd/read-protocol-state/cmd/snapshot.go

@@ -5,10 +5,16 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/onflow/flow-go/cmd/util/cmd/common"
+	commonFuncs "github.com/onflow/flow-go/cmd/util/common"
+	"github.com/onflow/flow-go/model/flow"
 	"github.com/onflow/flow-go/state/protocol"
 	"github.com/onflow/flow-go/state/protocol/inmem"
 )
 
+var flagCheckpointDir string
+var flagCheckpointScanStep uint
+var flagCheckpointScanEndHeight int64
+
 var SnapshotCmd = &cobra.Command{
 	Use:   "snapshot",
 	Short: "Read snapshot from protocol state",
@@ -26,6 +32,15 @@ func init() {
 
 	SnapshotCmd.Flags().BoolVar(&flagSealed, "sealed", false,
 		"get sealed block")
+
+	SnapshotCmd.Flags().StringVar(&flagCheckpointDir, "checkpoint-dir", "",
+		"(execution node only) get snapshot from the latest checkpoint file in the given checkpoint directory")
+
+	SnapshotCmd.Flags().UintVar(&flagCheckpointScanStep, "checkpoint-scan-step", 0,
+		"(execution node only) scan step for finding sealed height by checkpoint (use with --checkpoint-dir flag)")
+
+	SnapshotCmd.Flags().Int64Var(&flagCheckpointScanEndHeight, "checkpoint-scan-end-height", -1,
+		"(execution node only) scan end height for finding sealed height by checkpoint (use with --checkpoint-dir flag)")
 }
 
 func runSnapshot(*cobra.Command, []string) {
@@ -49,6 +64,28 @@ func runSnapshot(*cobra.Command, []string) {
 	} else if flagSealed {
 		log.Info().Msgf("get last sealed snapshot")
 		snapshot = state.Sealed()
+	} else if flagCheckpointDir != "" {
+		log.Info().Msgf("get snapshot for latest checkpoint in directory %v (step: %v, endHeight: %v)",
+			flagCheckpointDir, flagCheckpointScanStep, flagCheckpointScanEndHeight)
+		var protocolSnapshot protocol.Snapshot
+		var sealedHeight uint64
+		var sealedCommit flow.StateCommitment
+		if flagCheckpointScanEndHeight < 0 {
+			// using default end height which is the last sealed height
+			protocolSnapshot, sealedHeight, sealedCommit, err = commonFuncs.GenerateProtocolSnapshotForCheckpoint(
+				log.Logger, state, storages.Headers, storages.Seals, flagCheckpointDir, flagCheckpointScanStep)
+		} else {
+			// using customized end height
+			protocolSnapshot, sealedHeight, sealedCommit, err = commonFuncs.GenerateProtocolSnapshotForCheckpointWithHeights(
+				log.Logger, state, storages.Headers, storages.Seals, flagCheckpointDir, flagCheckpointScanStep, uint64(flagCheckpointScanEndHeight))
+		}
+
+		if err != nil {
+			log.Fatal().Err(err).Msgf("could not generate protocol snapshot for checkpoint in dir: %v", flagCheckpointDir)
+		}
+
+		snapshot = protocolSnapshot
+		log.Info().Msgf("snapshot found, sealed height %v, commit %x", sealedHeight, sealedCommit)
 	}
 
 	head, err := snapshot.Head()