feat: module hash by height query

CHANGELOG.md

@@ -62,6 +62,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 * (client) [#19870](https://github.com/cosmos/cosmos-sdk/pull/19870) Add new query command `wait-tx`. Alias `event-query-tx-for` to `wait-tx` for backward compatibility.
 * (crypto/keyring) [#20212](https://github.com/cosmos/cosmos-sdk/pull/20212) Expose the db keyring used in the keystore.
 * (genutil) [#19971](https://github.com/cosmos/cosmos-sdk/pull/19971) Allow manually setting the consensus key type in genesis
+* (cli) [#20779](https://github.com/cosmos/cosmos-sdk/pull/20779) Added `module-hash-by-height` command to query and retrieve module hashes at a specified blockchain height, enhancing debugging capabilities.
 
 ### Improvements
 

x/genutil/client/cli/module_hash_by_height.go

@@ -0,0 +1,107 @@
+package cli
+
+import (
+	"encoding/hex"
+	"fmt"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+
+	dbm "github.com/cosmos/cosmos-db"
+	"github.com/spf13/cobra"
+
+	"cosmossdk.io/store/rootmulti"
+	storetypes "cosmossdk.io/store/types"
+
+	"github.com/cosmos/cosmos-sdk/server"
+	servertypes "github.com/cosmos/cosmos-sdk/server/types"
+)
+
+// ModuleHashByHeightQuery retrieves the module hashes at a given height.
+func ModuleHashByHeightQuery[T servertypes.Application](appCreator servertypes.AppCreator[T]) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "module-hash-by-height [height]",
+		Short: "Get module hashes at a given height",
+		Long: `Get module hashes at a given height. This command is useful for debugging and verifying the state of the application at a given height. Daemon should not be running when calling this command.
+Example:
+	osmosisd module-hash-by-height 16841115,
+`,
+		Args: cobra.ExactArgs(1), // Ensure exactly one argument is provided
+		RunE: func(cmd *cobra.Command, args []string) error {
+			heightToRetrieveString := args[0]
+
+			serverCtx := server.GetServerContextFromCmd(cmd)
+
+			height, err := strconv.ParseInt(heightToRetrieveString, 10, 64)
+			if err != nil {
+				return err
+			}
+
+			commitInfoForHeight, err := getModuleHashesAtHeight(serverCtx, appCreator, height)
+			if err != nil {
+				return err
+			}
+
+			// Print the CommitInfo to the console.
+			fmt.Println(commitInfoForHeight.String())
+
+			return nil
+		},
+	}
+
+	return cmd
+}
+
+func getModuleHashesAtHeight[T servertypes.Application](svrCtx *server.Context, appCreator servertypes.AppCreator[T], height int64) (*storetypes.CommitInfo, error) {
+	home := svrCtx.Config.RootDir
+	db, err := openDB(home, server.GetAppDBBackend(svrCtx.Viper))
+	if err != nil {
+		return nil, fmt.Errorf("error opening DB, make sure osmosisd is not running when calling this query: %w", err)
+	}
+	app := appCreator(svrCtx.Logger, db, nil, svrCtx.Viper)
+	rms, ok := app.CommitMultiStore().(*rootmulti.Store)
+	if !ok {
+		return nil, fmt.Errorf("expected rootmulti.Store, got %T", app.CommitMultiStore())
+	}
+
+	commitInfoForHeight, err := rms.GetCommitInfo(height)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create a new slice of StoreInfos for storing the modified hashes.
+	storeInfos := make([]storetypes.StoreInfo, len(commitInfoForHeight.StoreInfos))
+
+	for i, storeInfo := range commitInfoForHeight.StoreInfos {
+		// Convert the hash to a hexadecimal string.
+		hash := strings.ToUpper(hex.EncodeToString(storeInfo.CommitId.Hash))
+
+		// Create a new StoreInfo with the modified hash.
+		storeInfos[i] = storetypes.StoreInfo{
+			Name: storeInfo.Name,
+			CommitId: storetypes.CommitID{
+				Version: storeInfo.CommitId.Version,
+				Hash:    []byte(hash),
+			},
+		}
+	}
+
+	// Sort the storeInfos slice based on the module name.
+	sort.Slice(storeInfos, func(i, j int) bool {
+		return storeInfos[i].Name < storeInfos[j].Name
+	})
+
+	// Create a new CommitInfo with the modified StoreInfos.
+	commitInfoForHeight = &storetypes.CommitInfo{
+		Version:    commitInfoForHeight.Version,
+		StoreInfos: storeInfos,
+	}
+
+	return commitInfoForHeight, nil
+}
+
+func openDB(rootDir string, backendType dbm.BackendType) (dbm.DB, error) {
+	dataDir := filepath.Join(rootDir, "data")
+	return dbm.NewDB("application", backendType, dataDir)
+}