app.go

package app

import (
	"io"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"github.com/cosmos/cosmos-sdk/client/grpc/tmservice"
	"github.com/gorilla/mux"
	"github.com/rakyll/statik/fs"
	"github.com/spf13/cast"
	abci "github.com/tendermint/tendermint/abci/types"
	tmjson "github.com/tendermint/tendermint/libs/json"
	"github.com/tendermint/tendermint/libs/log"
	tmos "github.com/tendermint/tendermint/libs/os"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	dbm "github.com/tendermint/tm-db"

	"github.com/cosmos/cosmos-sdk/baseapp"
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/client/rpc"
	"github.com/cosmos/cosmos-sdk/codec"
	"github.com/cosmos/cosmos-sdk/codec/types"
	ccodec "github.com/cosmos/cosmos-sdk/crypto/codec"
	"github.com/cosmos/cosmos-sdk/server/api"
	"github.com/cosmos/cosmos-sdk/server/config"
	servertypes "github.com/cosmos/cosmos-sdk/server/types"
	"github.com/cosmos/cosmos-sdk/simapp"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	"github.com/cosmos/cosmos-sdk/version"
	"github.com/cosmos/cosmos-sdk/x/auth"
	"github.com/cosmos/cosmos-sdk/x/auth/ante"
	authrest "github.com/cosmos/cosmos-sdk/x/auth/client/rest"
	authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
	authsims "github.com/cosmos/cosmos-sdk/x/auth/simulation"
	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	"github.com/cosmos/cosmos-sdk/x/auth/vesting"
	"github.com/cosmos/cosmos-sdk/x/bank"
	bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	"github.com/cosmos/cosmos-sdk/x/capability"
	capabilitykeeper "github.com/cosmos/cosmos-sdk/x/capability/keeper"
	capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
	"github.com/cosmos/cosmos-sdk/x/crisis"
	crisiskeeper "github.com/cosmos/cosmos-sdk/x/crisis/keeper"
	crisistypes "github.com/cosmos/cosmos-sdk/x/crisis/types"
	distr "github.com/cosmos/cosmos-sdk/x/distribution"
	distrclient "github.com/cosmos/cosmos-sdk/x/distribution/client"
	distrkeeper "github.com/cosmos/cosmos-sdk/x/distribution/keeper"
	distrtypes "github.com/cosmos/cosmos-sdk/x/distribution/types"
	"github.com/cosmos/cosmos-sdk/x/evidence"
	evidencekeeper "github.com/cosmos/cosmos-sdk/x/evidence/keeper"
	evidencetypes "github.com/cosmos/cosmos-sdk/x/evidence/types"
	"github.com/cosmos/cosmos-sdk/x/genutil"
	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
	"github.com/cosmos/cosmos-sdk/x/gov"
	govkeeper "github.com/cosmos/cosmos-sdk/x/gov/keeper"
	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
	transfer "github.com/cosmos/cosmos-sdk/x/ibc/applications/transfer"
	ibctransferkeeper "github.com/cosmos/cosmos-sdk/x/ibc/applications/transfer/keeper"
	ibctransfertypes "github.com/cosmos/cosmos-sdk/x/ibc/applications/transfer/types"
	ibc "github.com/cosmos/cosmos-sdk/x/ibc/core"
	ibcclient "github.com/cosmos/cosmos-sdk/x/ibc/core/02-client"
	porttypes "github.com/cosmos/cosmos-sdk/x/ibc/core/05-port/types"
	ibchost "github.com/cosmos/cosmos-sdk/x/ibc/core/24-host"
	ibckeeper "github.com/cosmos/cosmos-sdk/x/ibc/core/keeper"
	"github.com/cosmos/cosmos-sdk/x/mint"
	mintkeeper "github.com/cosmos/cosmos-sdk/x/mint/keeper"
	minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"
	"github.com/cosmos/cosmos-sdk/x/params"
	paramsclient "github.com/cosmos/cosmos-sdk/x/params/client"
	paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
	paramsproposal "github.com/cosmos/cosmos-sdk/x/params/types/proposal"
	"github.com/cosmos/cosmos-sdk/x/slashing"
	slashingkeeper "github.com/cosmos/cosmos-sdk/x/slashing/keeper"
	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
	"github.com/cosmos/cosmos-sdk/x/staking"
	stakingkeeper "github.com/cosmos/cosmos-sdk/x/staking/keeper"
	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
	"github.com/cosmos/cosmos-sdk/x/upgrade"
	upgradeclient "github.com/cosmos/cosmos-sdk/x/upgrade/client"
	upgradekeeper "github.com/cosmos/cosmos-sdk/x/upgrade/keeper"
	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"

	tmversion "github.com/tendermint/tendermint/proto/tendermint/version"

	// unnamed import of statik for swagger UI support
	_ "github.com/cosmos/cosmos-sdk/client/docs/statik"

	nabparams "github.com/onomyprotocol/near-aurora-bridge/module/app/params"
	"github.com/onomyprotocol/near-aurora-bridge/module/x/nab"
	"github.com/onomyprotocol/near-aurora-bridge/module/x/nab/keeper"
	nabtypes "github.com/onomyprotocol/near-aurora-bridge/module/x/nab/types"
)

const appName = "app"

var (
	// DefaultNodeHome sets the folder where the applcation data and configuration will be stored
	DefaultNodeHome string

	// ModuleBasics The module BasicManager is in charge of setting up basic,
	// non-dependant module elements, such as codec registration
	// and genesis verification.
	ModuleBasics = module.NewBasicManager(
		auth.AppModuleBasic{},
		genutil.AppModuleBasic{},
		bank.AppModuleBasic{},
		capability.AppModuleBasic{},
		staking.AppModuleBasic{},
		mint.AppModuleBasic{},
		distr.AppModuleBasic{},
		gov.NewAppModuleBasic(
			paramsclient.ProposalHandler,
			distrclient.ProposalHandler,
			upgradeclient.ProposalHandler,
			upgradeclient.CancelProposalHandler,
		),
		params.AppModuleBasic{},
		crisis.AppModuleBasic{},
		slashing.AppModuleBasic{},
		ibc.AppModuleBasic{},
		upgrade.AppModuleBasic{},
		evidence.AppModuleBasic{},
		transfer.AppModuleBasic{},
		vesting.AppModuleBasic{},
		nab.AppModuleBasic{},
	)

	// module account permissions
	// NOTE: We believe that this is giving various modules access to functions of the supply module? We will probably need to use this.
	maccPerms = map[string][]string{
		authtypes.FeeCollectorName:     nil,
		distrtypes.ModuleName:          nil,
		minttypes.ModuleName:           {authtypes.Minter},
		stakingtypes.BondedPoolName:    {authtypes.Burner, authtypes.Staking},
		stakingtypes.NotBondedPoolName: {authtypes.Burner, authtypes.Staking},
		govtypes.ModuleName:            {authtypes.Burner},
		ibctransfertypes.ModuleName:    {authtypes.Minter, authtypes.Burner},
		nabtypes.ModuleName:            {authtypes.Minter, authtypes.Burner},
	}

	// module accounts that are allowed to receive tokens
	allowedReceivingModAcc = map[string]bool{
		distrtypes.ModuleName: true,
	}

	// verify app interface at compile time
	_ simapp.App              = (*Nab)(nil)
	_ servertypes.Application = (*Nab)(nil)
)

// MakeCodec creates the application codec. The codec is sealed before it is
// returned.
func MakeCodec() *codec.LegacyAmino {
	var cdc = codec.NewLegacyAmino()
	ModuleBasics.RegisterLegacyAminoCodec(cdc)
	vesting.AppModuleBasic{}.RegisterLegacyAminoCodec(cdc)
	sdk.RegisterLegacyAminoCodec(cdc)
	ccodec.RegisterCrypto(cdc)
	cdc.Seal()
	return cdc
}

// Nab extended ABCI application
type Nab struct {
	*baseapp.BaseApp
	legacyAmino       *codec.LegacyAmino
	appCodec          codec.Marshaler
	interfaceRegistry types.InterfaceRegistry

	invCheckPeriod uint

	// keys to access the substores
	keys    map[string]*sdk.KVStoreKey
	tKeys   map[string]*sdk.TransientStoreKey
	memKeys map[string]*sdk.MemoryStoreKey

	// keepers
	accountKeeper    authkeeper.AccountKeeper
	bankKeeper       bankkeeper.Keeper
	capabilityKeeper *capabilitykeeper.Keeper
	stakingKeeper    stakingkeeper.Keeper
	slashingKeeper   slashingkeeper.Keeper
	mintKeeper       mintkeeper.Keeper
	distrKeeper      distrkeeper.Keeper
	govKeeper        govkeeper.Keeper
	crisisKeeper     crisiskeeper.Keeper
	upgradeKeeper    upgradekeeper.Keeper
	paramsKeeper     paramskeeper.Keeper
	ibcKeeper        *ibckeeper.Keeper
	evidenceKeeper   evidencekeeper.Keeper
	transferKeeper   ibctransferkeeper.Keeper
	nabKeeper        keeper.Keeper

	// make scoped keepers public for test purposes
	ScopedIBCKeeper      capabilitykeeper.ScopedKeeper
	ScopedTransferKeeper capabilitykeeper.ScopedKeeper

	// Module Manager
	mm *module.Manager

	// simulation manager
	sm *module.SimulationManager
}

func init() {
	userHomeDir, err := os.UserHomeDir()
	if err != nil {
		panic(err)
	}

	DefaultNodeHome = filepath.Join(userHomeDir, ".nab")
}

func NewNabApp(
	logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool, skipUpgradeHeights map[int64]bool,
	homePath string, invCheckPeriod uint, encodingConfig nabparams.EncodingConfig,
	appOpts servertypes.AppOptions, baseAppOptions ...func(*baseapp.BaseApp),
) *Nab {
	appCodec := encodingConfig.Marshaler
	legacyAmino := encodingConfig.Amino
	interfaceRegistry := encodingConfig.InterfaceRegistry

	bApp := baseapp.NewBaseApp(appName, logger, db, encodingConfig.TxConfig.TxDecoder(), baseAppOptions...)
	bApp.SetCommitMultiStoreTracer(traceStore)
	bApp.SetAppVersion(version.Version)
	bApp.SetInterfaceRegistry(interfaceRegistry)

	keys := sdk.NewKVStoreKeys(
		authtypes.StoreKey, banktypes.StoreKey, stakingtypes.StoreKey,
		minttypes.StoreKey, distrtypes.StoreKey, slashingtypes.StoreKey,
		govtypes.StoreKey, paramstypes.StoreKey, ibchost.StoreKey, upgradetypes.StoreKey,
		evidencetypes.StoreKey, ibctransfertypes.StoreKey, capabilitytypes.StoreKey,
		nabtypes.StoreKey,
	)
	tKeys := sdk.NewTransientStoreKeys(paramstypes.TStoreKey)
	memKeys := sdk.NewMemoryStoreKeys(capabilitytypes.MemStoreKey)

	//nolint: exhaustivestruct
	var app = &Nab{
		BaseApp:           bApp,
		legacyAmino:       legacyAmino,
		appCodec:          appCodec,
		interfaceRegistry: interfaceRegistry,
		invCheckPeriod:    invCheckPeriod,
		keys:              keys,
		tKeys:             tKeys,
		memKeys:           memKeys,
	}

	app.paramsKeeper = initParamsKeeper(appCodec, legacyAmino, keys[paramstypes.StoreKey], tKeys[paramstypes.TStoreKey])

	bApp.SetParamStore(app.paramsKeeper.Subspace(baseapp.Paramspace).WithKeyTable(paramskeeper.ConsensusParamsKeyTable()))

	app.capabilityKeeper = capabilitykeeper.NewKeeper(
		appCodec,
		keys[capabilitytypes.StoreKey],
		memKeys[capabilitytypes.MemStoreKey],
	)
	scopedIBCKeeper := app.capabilityKeeper.ScopeToModule(ibchost.ModuleName)
	scopedTransferKeeper := app.capabilityKeeper.ScopeToModule(ibctransfertypes.ModuleName)

	app.accountKeeper = authkeeper.NewAccountKeeper(
		appCodec,
		keys[authtypes.StoreKey],
		app.GetSubspace(authtypes.ModuleName),
		authtypes.ProtoBaseAccount,
		maccPerms,
	)

	app.bankKeeper = bankkeeper.NewBaseKeeper(
		appCodec,
		keys[banktypes.StoreKey],
		app.accountKeeper,
		app.GetSubspace(banktypes.ModuleName),
		app.BlockedAddrs(),
	)

	stakingKeeper := stakingkeeper.NewKeeper(
		appCodec,
		keys[stakingtypes.StoreKey],
		app.accountKeeper,
		app.bankKeeper,
		app.GetSubspace(stakingtypes.ModuleName),
	)

	app.mintKeeper = mintkeeper.NewKeeper(
		appCodec,
		keys[minttypes.StoreKey],
		app.GetSubspace(minttypes.ModuleName),
		&stakingKeeper,
		app.accountKeeper,
		app.bankKeeper,
		authtypes.FeeCollectorName,
	)

	app.distrKeeper = distrkeeper.NewKeeper(
		appCodec,
		keys[distrtypes.StoreKey],
		app.GetSubspace(distrtypes.ModuleName),
		app.accountKeeper,
		app.bankKeeper,
		&stakingKeeper,
		authtypes.FeeCollectorName,
		app.ModuleAccountAddrs(),
	)

	app.slashingKeeper = slashingkeeper.NewKeeper(
		appCodec,
		keys[slashingtypes.StoreKey],
		&stakingKeeper,
		app.GetSubspace(slashingtypes.ModuleName),
	)

	app.crisisKeeper = crisiskeeper.NewKeeper(
		app.GetSubspace(crisistypes.ModuleName),
		invCheckPeriod,
		app.bankKeeper,
		authtypes.FeeCollectorName,
	)

	app.upgradeKeeper = upgradekeeper.NewKeeper(
		skipUpgradeHeights,
		keys[upgradetypes.StoreKey],
		appCodec,
		homePath,
	)

	app.ibcKeeper = ibckeeper.NewKeeper(
		appCodec,
		keys[ibchost.StoreKey],
		app.GetSubspace(ibchost.ModuleName),
		app.stakingKeeper,
		scopedIBCKeeper,
	)

	govRouter := govtypes.NewRouter()
	govRouter.AddRoute(govtypes.RouterKey, govtypes.ProposalHandler).
		AddRoute(paramsproposal.RouterKey, params.NewParamChangeProposalHandler(app.paramsKeeper)).
		AddRoute(distrtypes.RouterKey, distr.NewCommunityPoolSpendProposalHandler(app.distrKeeper)).
		AddRoute(upgradetypes.RouterKey, upgrade.NewSoftwareUpgradeProposalHandler(app.upgradeKeeper)).
		AddRoute(ibchost.RouterKey, ibcclient.NewClientUpdateProposalHandler(app.ibcKeeper.ClientKeeper))

	app.govKeeper = govkeeper.NewKeeper(
		appCodec,
		keys[govtypes.StoreKey],
		app.GetSubspace(govtypes.ModuleName),
		app.accountKeeper,
		app.bankKeeper,
		&stakingKeeper,
		govRouter,
	)

	app.transferKeeper = ibctransferkeeper.NewKeeper(
		appCodec, keys[ibctransfertypes.StoreKey], app.GetSubspace(ibctransfertypes.ModuleName),
		app.ibcKeeper.ChannelKeeper, &app.ibcKeeper.PortKeeper,
		app.accountKeeper, app.bankKeeper, scopedTransferKeeper,
	)
	transferModule := transfer.NewAppModule(app.transferKeeper)

	ibcRouter := porttypes.NewRouter()
	ibcRouter.AddRoute(ibctransfertypes.ModuleName, transferModule)
	app.ibcKeeper.SetRouter(ibcRouter)

	evidenceKeeper := evidencekeeper.NewKeeper(
		appCodec,
		keys[evidencetypes.StoreKey],
		&stakingKeeper,
		app.slashingKeeper,
	)
	app.evidenceKeeper = *evidenceKeeper

	app.nabKeeper = keeper.NewKeeper(
		appCodec,
		keys[nabtypes.StoreKey],
		app.GetSubspace(nabtypes.ModuleName),
		stakingKeeper,
		app.bankKeeper,
		app.slashingKeeper,
	)

	app.stakingKeeper = *stakingKeeper.SetHooks(
		stakingtypes.NewMultiStakingHooks(
			app.distrKeeper.Hooks(),
			app.slashingKeeper.Hooks(),
			app.nabKeeper.Hooks(),
		),
	)

	var skipGenesisInvariants = cast.ToBool(appOpts.Get(crisis.FlagSkipGenesisInvariants))

	app.mm = module.NewManager(
		genutil.NewAppModule(
			app.accountKeeper,
			app.stakingKeeper,
			app.BaseApp.DeliverTx,
			encodingConfig.TxConfig,
		),
		auth.NewAppModule(
			appCodec,
			app.accountKeeper,
			nil,
		),
		vesting.NewAppModule(
			app.accountKeeper,
			app.bankKeeper,
		),
		bank.NewAppModule(
			appCodec,
			app.bankKeeper,
			app.accountKeeper,
		),
		capability.NewAppModule(
			appCodec,
			*app.capabilityKeeper,
		),
		crisis.NewAppModule(
			&app.crisisKeeper,
			skipGenesisInvariants,
		),
		gov.NewAppModule(
			appCodec,
			app.govKeeper,
			app.accountKeeper,
			app.bankKeeper,
		),
		mint.NewAppModule(
			appCodec,
			app.mintKeeper,
			app.accountKeeper,
		),
		slashing.NewAppModule(
			appCodec,
			app.slashingKeeper,
			app.accountKeeper,
			app.bankKeeper,
			app.stakingKeeper,
		),
		distr.NewAppModule(
			appCodec,
			app.distrKeeper,
			app.accountKeeper,
			app.bankKeeper,
			app.stakingKeeper,
		),
		staking.NewAppModule(appCodec,
			app.stakingKeeper,
			app.accountKeeper,
			app.bankKeeper,
		),
		upgrade.NewAppModule(app.upgradeKeeper),
		evidence.NewAppModule(app.evidenceKeeper),
		ibc.NewAppModule(app.ibcKeeper),
		params.NewAppModule(app.paramsKeeper),
		transferModule,
		nab.NewAppModule(
			app.nabKeeper,
			app.bankKeeper,
		),
	)

	app.mm.SetOrderBeginBlockers(
		upgradetypes.ModuleName,
		minttypes.ModuleName,
		distrtypes.ModuleName,
		slashingtypes.ModuleName,
		evidencetypes.ModuleName,
		stakingtypes.ModuleName,
		ibchost.ModuleName,
	)
	app.mm.SetOrderEndBlockers(
		crisistypes.ModuleName,
		govtypes.ModuleName,
		stakingtypes.ModuleName,
		nabtypes.ModuleName,
	)
	app.mm.SetOrderInitGenesis(
		capabilitytypes.ModuleName,
		authtypes.ModuleName,
		banktypes.ModuleName,
		distrtypes.ModuleName,
		stakingtypes.ModuleName,
		slashingtypes.ModuleName,
		govtypes.ModuleName,
		minttypes.ModuleName,
		crisistypes.ModuleName,
		ibchost.ModuleName,
		genutiltypes.ModuleName,
		evidencetypes.ModuleName,
		ibctransfertypes.ModuleName,
		nabtypes.ModuleName,
	)

	app.mm.RegisterInvariants(&app.crisisKeeper)
	app.mm.RegisterRoutes(app.Router(), app.QueryRouter(), encodingConfig.Amino)
	app.mm.RegisterServices(module.NewConfigurator(app.MsgServiceRouter(), app.GRPCQueryRouter()))

	app.sm = module.NewSimulationManager(
		auth.NewAppModule(appCodec, app.accountKeeper, authsims.RandomGenesisAccounts),
		bank.NewAppModule(appCodec, app.bankKeeper, app.accountKeeper),
		capability.NewAppModule(appCodec, *app.capabilityKeeper),
		gov.NewAppModule(appCodec, app.govKeeper, app.accountKeeper, app.bankKeeper),
		mint.NewAppModule(appCodec, app.mintKeeper, app.accountKeeper),
		staking.NewAppModule(appCodec, app.stakingKeeper, app.accountKeeper, app.bankKeeper),
		distr.NewAppModule(appCodec, app.distrKeeper, app.accountKeeper, app.bankKeeper, app.stakingKeeper),
		slashing.NewAppModule(appCodec, app.slashingKeeper, app.accountKeeper, app.bankKeeper, app.stakingKeeper),
		params.NewAppModule(app.paramsKeeper),
		evidence.NewAppModule(app.evidenceKeeper),
		ibc.NewAppModule(app.ibcKeeper),
		transferModule,
	)

	app.sm.RegisterStoreDecoders()

	app.MountKVStores(keys)
	app.MountTransientStores(tKeys)
	app.MountMemoryStores(memKeys)

	app.SetInitChainer(app.InitChainer)
	app.SetBeginBlocker(app.BeginBlocker)
	app.SetAnteHandler(
		ante.NewAnteHandler(
			app.accountKeeper,
			app.bankKeeper,
			ante.DefaultSigVerificationGasConsumer,
			encodingConfig.TxConfig.SignModeHandler(),
		),
	)
	app.SetEndBlocker(app.EndBlocker)

	if loadLatest {
		if err := app.LoadLatestVersion(); err != nil {
			tmos.Exit(err.Error())
		}

		// Initialize and seal the capability keeper so all persistent capabilities
		// are loaded in-memory and prevent any further modules from creating scoped
		// sub-keepers.
		// This must be done during creation of baseapp rather than in InitChain so
		// that in-memory capabilities get regenerated on app restart.
		// Note that since this reads from the store, we can only perform it when
		// `loadLatest` is set to true.
		ctx := app.BaseApp.NewUncachedContext(true, tmproto.Header{
			Version: tmversion.Consensus{
				Block: 0,
				App:   0,
			},
			ChainID: "",
			Height:  0,
			Time:    time.Time{},
			LastBlockId: tmproto.BlockID{
				Hash: []byte{},
				PartSetHeader: tmproto.PartSetHeader{
					Total: 0,
					Hash:  []byte{},
				},
			},
			LastCommitHash:     []byte{},
			DataHash:           []byte{},
			ValidatorsHash:     []byte{},
			NextValidatorsHash: []byte{},
			ConsensusHash:      []byte{},
			AppHash:            []byte{},
			LastResultsHash:    []byte{},
			EvidenceHash:       []byte{},
			ProposerAddress:    []byte{},
		})
		app.capabilityKeeper.InitializeAndSeal(ctx)
	}

	app.ScopedIBCKeeper = scopedIBCKeeper
	app.ScopedTransferKeeper = scopedTransferKeeper

	return app
}

// MakeCodecs constructs the *std.Codec and *codec.LegacyAmino instances used by
// simapp. It is useful for tests and clients who do not want to construct the
// full simapp
func MakeCodecs() (codec.Marshaler, *codec.LegacyAmino) {
	config := MakeEncodingConfig()
	return config.Marshaler, config.Amino
}

// Name returns the name of the App
func (app *Nab) Name() string { return app.BaseApp.Name() }

// BeginBlocker application updates every begin block
func (app *Nab) BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) abci.ResponseBeginBlock {
	return app.mm.BeginBlock(ctx, req)
}

// EndBlocker application updates every end block
func (app *Nab) EndBlocker(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock {
	return app.mm.EndBlock(ctx, req)
}

// InitChainer application update at chain initialization
func (app *Nab) InitChainer(ctx sdk.Context, req abci.RequestInitChain) abci.ResponseInitChain {
	var genesisState simapp.GenesisState
	if err := tmjson.Unmarshal(req.AppStateBytes, &genesisState); err != nil {
		panic(err)
	}
	return app.mm.InitGenesis(ctx, app.appCodec, genesisState)
}

// LoadHeight loads a particular height
func (app *Nab) LoadHeight(height int64) error {
	return app.LoadVersion(height)
}

// ModuleAccountAddrs returns all the app's module account addresses.
func (app *Nab) ModuleAccountAddrs() map[string]bool {
	modAccAddrs := make(map[string]bool)
	for acc := range maccPerms {
		modAccAddrs[authtypes.NewModuleAddress(acc).String()] = true
	}

	return modAccAddrs
}

// BlockedAddrs returns all the app's module account addresses that are not
// allowed to receive external tokens.
func (app *Nab) BlockedAddrs() map[string]bool {
	blockedAddrs := make(map[string]bool)
	for acc := range maccPerms {
		blockedAddrs[authtypes.NewModuleAddress(acc).String()] = !allowedReceivingModAcc[acc]
	}

	return blockedAddrs
}

// LegacyAmino returns SimApp's amino codec.
//
// NOTE: This is solely to be used for testing purposes as it may be desirable
// for modules to register their own custom testing types.
func (app *Nab) LegacyAmino() *codec.LegacyAmino {
	return app.legacyAmino
}

// AppCodec returns SimApp's app codec.
//
// NOTE: This is solely to be used for testing purposes as it may be desirable
// for modules to register their own custom testing types.
func (app *Nab) AppCodec() codec.Marshaler {
	return app.appCodec
}

// InterfaceRegistry returns SimApp's InterfaceRegistry
func (app *Nab) InterfaceRegistry() types.InterfaceRegistry {
	return app.interfaceRegistry
}

// GetKey returns the KVStoreKey for the provided store key.
//
// NOTE: This is solely to be used for testing purposes.
func (app *Nab) GetKey(storeKey string) *sdk.KVStoreKey {
	return app.keys[storeKey]
}

// GetTKey returns the TransientStoreKey for the provided store key.
//
// NOTE: This is solely to be used for testing purposes.
func (app *Nab) GetTKey(storeKey string) *sdk.TransientStoreKey {
	return app.tKeys[storeKey]
}

// GetMemKey returns the MemStoreKey for the provided mem key.
//
// NOTE: This is solely used for testing purposes.
func (app *Nab) GetMemKey(storeKey string) *sdk.MemoryStoreKey {
	return app.memKeys[storeKey]
}

// GetSubspace returns a param subspace for a given module name.
func (app *Nab) GetSubspace(moduleName string) paramstypes.Subspace {
	subspace, _ := app.paramsKeeper.GetSubspace(moduleName)
	return subspace
}

// SimulationManager implements the SimulationApp interface
func (app *Nab) SimulationManager() *module.SimulationManager {
	return app.sm
}

// RegisterAPIRoutes registers all application module routes with the provided
// API server.
func (app *Nab) RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APIConfig) {
	clientCtx := apiSvr.ClientCtx
	rpc.RegisterRoutes(clientCtx, apiSvr.Router)
	authrest.RegisterTxRoutes(clientCtx, apiSvr.Router)
	authtx.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
	ModuleBasics.RegisterRESTRoutes(clientCtx, apiSvr.Router)
	ModuleBasics.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
	// TODO: build the custom gravity swagger files and add here?
	if apiConfig.Swagger {
		RegisterSwaggerAPI(clientCtx, apiSvr.Router)
	}
}

// RegisterSwaggerAPI registers swagger route with API Server
// TODO: build the custom gravity swagger files and add here?
func RegisterSwaggerAPI(ctx client.Context, rtr *mux.Router) {
	statikFS, err := fs.New()
	if err != nil {
		panic(err)
	}

	staticServer := http.FileServer(statikFS)
	rtr.PathPrefix("/swagger/").Handler(http.StripPrefix("/swagger/", staticServer))
}

// RegisterTxService implements the Application.RegisterTxService method.
func (app *Nab) RegisterTxService(clientCtx client.Context) {
	authtx.RegisterTxService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.BaseApp.Simulate, app.interfaceRegistry)
}

// RegisterTendermintService implements the Application.RegisterTendermintService method.
func (app *Nab) RegisterTendermintService(clientCtx client.Context) {
	tmservice.RegisterTendermintService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.interfaceRegistry)
}

// GetMaccPerms returns a mapping of the application's module account permissions.
func GetMaccPerms() map[string][]string {
	modAccPerms := make(map[string][]string)
	for k, v := range maccPerms {
		modAccPerms[k] = v
	}
	return modAccPerms
}

// initParamsKeeper init params keeper and its subspaces
func initParamsKeeper(appCodec codec.BinaryMarshaler, legacyAmino *codec.LegacyAmino, key, tkey sdk.StoreKey) paramskeeper.Keeper {
	paramsKeeper := paramskeeper.NewKeeper(appCodec, legacyAmino, key, tkey)

	paramsKeeper.Subspace(authtypes.ModuleName)
	paramsKeeper.Subspace(banktypes.ModuleName)
	paramsKeeper.Subspace(stakingtypes.ModuleName)
	paramsKeeper.Subspace(minttypes.ModuleName)
	paramsKeeper.Subspace(distrtypes.ModuleName)
	paramsKeeper.Subspace(slashingtypes.ModuleName)
	paramsKeeper.Subspace(govtypes.ModuleName).WithKeyTable(govtypes.ParamKeyTable())
	paramsKeeper.Subspace(crisistypes.ModuleName)
	paramsKeeper.Subspace(ibctransfertypes.ModuleName)
	paramsKeeper.Subspace(nabtypes.ModuleName)
	paramsKeeper.Subspace(ibchost.ModuleName)

	return paramsKeeper
}