feat: support dynamic app db backend flag (#1226)

* support dynamic app db backend

* address pr reviews

* add comment

* Update server/start.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

server/flags/flags.go

@@ -7,13 +7,15 @@ import (
 	"github.com/spf13/viper"
 )
 
-// Tendermint full-node start flags
+// Tendermint/cosmos-sdk full-node start flags
 const (
 	WithTendermint = "with-tendermint"
 	Address        = "address"
 	Transport      = "transport"
 	TraceStore     = "trace-store"
 	CPUProfile     = "cpu-profile"
+	// The type of database for application and snapshots databases
+	AppDBBackend = "app-db-backend"
 )
 
 // GRPC-related flags.

server/start.go

@@ -141,6 +141,7 @@ which accepts a path for the resulting pprof file.
 	cmd.Flags().Uint64(server.FlagPruningInterval, 0, "Height interval at which pruned heights are removed from disk (ignored if pruning is not 'custom')")
 	cmd.Flags().Uint(server.FlagInvCheckPeriod, 0, "Assert registered invariants every N blocks")
 	cmd.Flags().Uint64(server.FlagMinRetainBlocks, 0, "Minimum block height offset during ABCI commit to prune Tendermint blocks")
+	cmd.Flags().String(srvflags.AppDBBackend, "", "The type of database for application and snapshots databases")
 
 	cmd.Flags().Bool(srvflags.GRPCEnable, true, "Define if the gRPC server should be enabled")
 	cmd.Flags().String(srvflags.GRPCAddress, serverconfig.DefaultGRPCAddress, "the gRPC server address to listen on")