support customize db opener in StartCmd (evmos#1615)

* support customize db opener in `StartCmd`

* Update CHANGELOG.md

* pass  to dbOpener, so we can control different options through cli flags

* add comments

CHANGELOG.md

@@ -43,6 +43,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (rpc) [#1613](https://github.com/evmos/ethermint/pull/1613) Change the default json-rpc listen address to localhost.
 * (rpc) [#1611](https://github.com/evmos/ethermint/pull/1611) Add missing next fee in fee history, fix wrong oldestBlock and align earliest input as ethereum.
 
+### Improvements
+
+* (cli) [#1615](https://github.com/evmos/ethermint/pull/1615) Support customize db opener in `StartCmd`.
+
 ## [v0.21.0-rc1] - 2022-1-13
 
 ### State Machine Breaking

cmd/ethermintd/root.go

@@ -130,7 +130,7 @@ func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 	)
 
 	a := appCreator{encodingConfig}
-	server.AddCommands(rootCmd, app.DefaultNodeHome, a.newApp, a.appExport, addModuleInitFlags)
+	server.AddCommands(rootCmd, server.NewDefaultStartOptions(a.newApp, app.DefaultNodeHome), a.appExport, addModuleInitFlags)
 
 	// add keybase, auxiliary RPC, query, and tx child commands
 	rootCmd.AddCommand(

server/start.go

@@ -68,9 +68,28 @@ import (
 	ethermint "github.com/evmos/ethermint/types"
 )
 
+// DBOpener is a function to open `application.db`, potentially with customized options.
+type DBOpener func(opts types.AppOptions, rootDir string, backend dbm.BackendType) (dbm.DB, error)
+
+// StartOptions defines options that can be customized in `StartCmd`
+type StartOptions struct {
+	AppCreator      types.AppCreator
+	DefaultNodeHome string
+	DBOpener        DBOpener
+}
+
+// NewDefaultStartOptions use the default db opener provided in tm-db.
+func NewDefaultStartOptions(appCreator types.AppCreator, defaultNodeHome string) StartOptions {
+	return StartOptions{
+		AppCreator:      appCreator,
+		DefaultNodeHome: defaultNodeHome,
+		DBOpener:        openDB,
+	}
+}
+
 // StartCmd runs the service passed in, either stand-alone or in-process with
 // Tendermint.
-func StartCmd(appCreator types.AppCreator, defaultNodeHome string) *cobra.Command {
+func StartCmd(opts StartOptions) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "start",
 		Short: "Run the full node",
@@ -119,7 +138,7 @@ which accepts a path for the resulting pprof file.
 			withTM, _ := cmd.Flags().GetBool(srvflags.WithTendermint)
 			if !withTM {
 				serverCtx.Logger.Info("starting ABCI without Tendermint")
-				return startStandAlone(serverCtx, appCreator)
+				return startStandAlone(serverCtx, opts)
 			}
 
 			serverCtx.Logger.Info("Unlocking keyring")
@@ -136,7 +155,7 @@ which accepts a path for the resulting pprof file.
 			serverCtx.Logger.Info("starting ABCI with Tendermint")
 
 			// amino is needed here for backwards compatibility of REST routes
-			err = startInProcess(serverCtx, clientCtx, appCreator)
+			err = startInProcess(serverCtx, clientCtx, opts)
 			errCode, ok := err.(server.ErrorCode)
 			if !ok {
 				return err
@@ -147,7 +166,7 @@ which accepts a path for the resulting pprof file.
 		},
 	}
 
-	cmd.Flags().String(flags.FlagHome, defaultNodeHome, "The application home directory")
+	cmd.Flags().String(flags.FlagHome, opts.DefaultNodeHome, "The application home directory")
 	cmd.Flags().Bool(srvflags.WithTendermint, true, "Run abci app embedded in-process with tendermint")
 	cmd.Flags().String(srvflags.Address, "tcp://0.0.0.0:26658", "Listen address")
 	cmd.Flags().String(srvflags.Transport, "socket", "Transport protocol: socket, grpc")
@@ -206,12 +225,12 @@ which accepts a path for the resulting pprof file.
 	return cmd
 }
 
-func startStandAlone(ctx *server.Context, appCreator types.AppCreator) error {
+func startStandAlone(ctx *server.Context, opts StartOptions) error {
 	addr := ctx.Viper.GetString(srvflags.Address)
 	transport := ctx.Viper.GetString(srvflags.Transport)
 	home := ctx.Viper.GetString(flags.FlagHome)
 
-	db, err := openDB(home, server.GetAppDBBackend(ctx.Viper))
+	db, err := opts.DBOpener(ctx.Viper, home, server.GetAppDBBackend(ctx.Viper))
 	if err != nil {
 		return err
 	}
@@ -228,7 +247,7 @@ func startStandAlone(ctx *server.Context, appCreator types.AppCreator) error {
 		return err
 	}
 
-	app := appCreator(ctx.Logger, db, traceWriter, ctx.Viper)
+	app := opts.AppCreator(ctx.Logger, db, traceWriter, ctx.Viper)
 
 	config, err := config.GetConfig(ctx.Viper)
 	if err != nil {
@@ -269,7 +288,7 @@ func startStandAlone(ctx *server.Context, appCreator types.AppCreator) error {
 }
 
 // legacyAminoCdc is used for the legacy REST API
-func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator types.AppCreator) (err error) {
+func startInProcess(ctx *server.Context, clientCtx client.Context, opts StartOptions) (err error) {
 	cfg := ctx.Config
 	home := cfg.RootDir
 	logger := ctx.Logger
@@ -300,7 +319,7 @@ func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator ty
 		}()
 	}
 
-	db, err := openDB(home, server.GetAppDBBackend(ctx.Viper))
+	db, err := opts.DBOpener(ctx.Viper, home, server.GetAppDBBackend(ctx.Viper))
 	if err != nil {
 		logger.Error("failed to open DB", "error", err.Error())
 		return err
@@ -330,7 +349,7 @@ func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator ty
 		return err
 	}
 
-	app := appCreator(ctx.Logger, db, traceWriter, ctx.Viper)
+	app := opts.AppCreator(ctx.Logger, db, traceWriter, ctx.Viper)
 
 	nodeKey, err := p2p.LoadOrGenNodeKey(cfg.NodeKeyFile())
 	if err != nil {
@@ -625,7 +644,7 @@ func startInProcess(ctx *server.Context, clientCtx client.Context, appCreator ty
 	return server.WaitForQuitSignals()
 }
 
-func openDB(rootDir string, backendType dbm.BackendType) (dbm.DB, error) {
+func openDB(_ types.AppOptions, rootDir string, backendType dbm.BackendType) (dbm.DB, error) {
 	dataDir := filepath.Join(rootDir, "data")
 	return dbm.NewDB("application", backendType, dataDir)
 }

server/util.go

@@ -38,8 +38,7 @@ import (
 // AddCommands adds server commands
 func AddCommands(
 	rootCmd *cobra.Command,
-	defaultNodeHome string,
-	appCreator types.AppCreator,
+	opts StartOptions,
 	appExport types.AppExporter,
 	addStartFlags types.ModuleInitFlags,
 ) {
@@ -57,15 +56,15 @@ func AddCommands(
 		tmcmd.ResetStateCmd,
 	)
 
-	startCmd := StartCmd(appCreator, defaultNodeHome)
+	startCmd := StartCmd(opts)
 	addStartFlags(startCmd)
 
 	rootCmd.AddCommand(
 		startCmd,
 		tendermintCmd,
-		sdkserver.ExportCmd(appExport, defaultNodeHome),
+		sdkserver.ExportCmd(appExport, opts.DefaultNodeHome),
 		version.NewVersionCommand(),
-		sdkserver.NewRollbackCmd(appCreator, defaultNodeHome),
+		sdkserver.NewRollbackCmd(opts.AppCreator, opts.DefaultNodeHome),
 
 		// custom tx indexer command
 		NewIndexTxCmd(),