Add RegisterInvariants to Configuration

app/app.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"
 
+	"github.com/CosmWasm/wasmd/x/wasm"
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/client/grpc/tmservice"
@@ -16,29 +17,40 @@ import (
 	"github.com/cosmos/cosmos-sdk/server/config"
 	servertypes "github.com/cosmos/cosmos-sdk/server/types"
 	simappparams "github.com/cosmos/cosmos-sdk/simapp/params"
+	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"
 	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"
 	"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"
@@ -47,44 +59,30 @@ import (
 	ibcmock "github.com/cosmos/cosmos-sdk/x/ibc/testing/mock"
 	"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"
 	paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
+	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
 	paramproposal "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"
 	upgradekeeper "github.com/cosmos/cosmos-sdk/x/upgrade/keeper"
+	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
 	"github.com/gorilla/mux"
 	"github.com/rakyll/statik/fs"
-	"github.com/regen-network/regen-ledger/types/module/server"
 	"github.com/spf13/cast"
 	abci "github.com/tendermint/tendermint/abci/types"
 	"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"
 
-	// types
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
-	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
-	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
-	capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
-	crisistypes "github.com/cosmos/cosmos-sdk/x/crisis/types"
-	distrtypes "github.com/cosmos/cosmos-sdk/x/distribution/types"
-	evidencetypes "github.com/cosmos/cosmos-sdk/x/evidence/types"
-	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
-	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
-	ibctransfertypes "github.com/cosmos/cosmos-sdk/x/ibc/applications/transfer/types"
-	minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"
-	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
-	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
-	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
-	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
-
-	"github.com/CosmWasm/wasmd/x/wasm"
+	"github.com/regen-network/regen-ledger/types/module/server"
 )
 
 const (
@@ -320,6 +318,7 @@ func NewRegenApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest
 
 	// register experimental modules here
 	app.smm = setCustomModules(app, interfaceRegistry)
+	app.smm.RegisterInvariants(&app.CrisisKeeper)
 
 	var skipGenesisInvariants = cast.ToBool(appOpts.Get(crisis.FlagSkipGenesisInvariants))
 

app/experimental_appconfig.go

@@ -12,14 +12,14 @@ import (
 	"github.com/cosmos/cosmos-sdk/codec/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
-	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
-	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
-
 	distrclient "github.com/cosmos/cosmos-sdk/x/distribution/client"
 	"github.com/cosmos/cosmos-sdk/x/gov"
+	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
 	paramsclient "github.com/cosmos/cosmos-sdk/x/params/client"
 	paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
 	upgradeclient "github.com/cosmos/cosmos-sdk/x/upgrade/client"
+	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
+
 	moduletypes "github.com/regen-network/regen-ledger/types/module"
 	"github.com/regen-network/regen-ledger/types/module/server"
 	data "github.com/regen-network/regen-ledger/x/data/module"

app/stable_appconfig.go

@@ -14,6 +14,7 @@ import (
 	paramsclient "github.com/cosmos/cosmos-sdk/x/params/client"
 	paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
 	upgradeclient "github.com/cosmos/cosmos-sdk/x/upgrade/client"
+
 	"github.com/regen-network/regen-ledger/types/module/server"
 )
 

go.sum

@@ -850,7 +850,6 @@ golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -895,7 +894,6 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
@@ -905,7 +903,6 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b h1:QRR6H1YWRnHb4Y/HeNFCTJLFVxaq6wH4YuVdsUOr75U=
 gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
@@ -914,7 +911,6 @@ gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
@@ -924,7 +920,6 @@ gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

types/module/server/manager.go

@@ -18,23 +18,34 @@ import (
 
 // Manager is the server module manager
 type Manager struct {
-	baseApp               *baseapp.BaseApp
-	cdc                   *codec.ProtoCodec
-	keys                  map[string]ModuleKey
-	router                *router
-	requiredServices      map[reflect.Type]bool
-	initGenesisHandlers   map[string]module.InitGenesisHandler
-	exportGenesisHandlers map[string]module.ExportGenesisHandler
+	baseApp                   *baseapp.BaseApp
+	cdc                       *codec.ProtoCodec
+	keys                      map[string]ModuleKey
+	router                    *router
+	requiredServices          map[reflect.Type]bool
+	initGenesisHandlers       map[string]module.InitGenesisHandler
+	exportGenesisHandlers     map[string]module.ExportGenesisHandler
+	registerInvariantsHandler map[string]RegisterInvariantsHandler
+}
+
+// RegisterInvariants registers all module routes and module querier routes
+func (mm *Manager) RegisterInvariants(ir sdk.InvariantRegistry) {
+	for _, invariant := range mm.registerInvariantsHandler {
+		if invariant != nil {
+			invariant(ir)
+		}
+	}
 }
 
 // NewManager creates a new Manager
 func NewManager(baseApp *baseapp.BaseApp, cdc *codec.ProtoCodec) *Manager {
 	return &Manager{
-		baseApp:               baseApp,
-		cdc:                   cdc,
-		keys:                  map[string]ModuleKey{},
-		initGenesisHandlers:   map[string]module.InitGenesisHandler{},
-		exportGenesisHandlers: map[string]module.ExportGenesisHandler{},
+		baseApp:                   baseApp,
+		cdc:                       cdc,
+		keys:                      map[string]ModuleKey{},
+		registerInvariantsHandler: map[string]RegisterInvariantsHandler{},
+		initGenesisHandlers:       map[string]module.InitGenesisHandler{},
+		exportGenesisHandlers:     map[string]module.ExportGenesisHandler{},
 		router: &router{
 			handlers:         map[string]handler{},
 			providedServices: map[reflect.Type]bool{},
@@ -105,6 +116,7 @@ func (mm *Manager) RegisterModules(modules []module.Module) error {
 		}
 
 		serverMod.RegisterServices(cfg)
+		mm.registerInvariantsHandler[name] = cfg.registerInvariantsHandler
 		mm.initGenesisHandlers[name] = cfg.initGenesisHandler
 		mm.exportGenesisHandlers[name] = cfg.exportGenesisHandler
 
@@ -211,15 +223,18 @@ func exportGenesis(ctx sdk.Context, cdc codec.JSONMarshaler, exportGenesisHandle
 	return genesisData, nil
 }
 
+type RegisterInvariantsHandler func(ir sdk.InvariantRegistry)
+
 type configurator struct {
-	msgServer            gogogrpc.Server
-	queryServer          gogogrpc.Server
-	key                  *rootModuleKey
-	cdc                  codec.Marshaler
-	requiredServices     map[reflect.Type]bool
-	router               sdk.Router
-	initGenesisHandler   module.InitGenesisHandler
-	exportGenesisHandler module.ExportGenesisHandler
+	msgServer                 gogogrpc.Server
+	queryServer               gogogrpc.Server
+	key                       *rootModuleKey
+	cdc                       codec.Marshaler
+	requiredServices          map[reflect.Type]bool
+	router                    sdk.Router
+	initGenesisHandler        module.InitGenesisHandler
+	exportGenesisHandler      module.ExportGenesisHandler
+	registerInvariantsHandler RegisterInvariantsHandler
 }
 
 var _ Configurator = &configurator{}
@@ -232,6 +247,10 @@ func (c *configurator) QueryServer() gogogrpc.Server {
 	return c.queryServer
 }
 
+func (c *configurator) RegisterInvariantsHandler(registry RegisterInvariantsHandler) {
+	c.registerInvariantsHandler = registry
+}
+
 func (c *configurator) RegisterGenesisHandlers(initGenesisHandler module.InitGenesisHandler, exportGenesisHandler module.ExportGenesisHandler) {
 	c.initGenesisHandler = initGenesisHandler
 	c.exportGenesisHandler = exportGenesisHandler

types/module/server/module.go

@@ -4,6 +4,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkmodule "github.com/cosmos/cosmos-sdk/types/module"
+
 	"github.com/regen-network/regen-ledger/types/module"
 )
 
@@ -20,6 +21,7 @@ type Configurator interface {
 	ModuleKey() RootModuleKey
 	Marshaler() codec.Marshaler
 	RequireServer(interface{})
+	RegisterInvariantsHandler(registry RegisterInvariantsHandler)
 	RegisterGenesisHandlers(module.InitGenesisHandler, module.ExportGenesisHandler)
 
 	// Router() is temporarily added here to use in the group module.

types/module/server/testutil.go

@@ -6,8 +6,6 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/regen-network/regen-ledger/testutil"
-
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/codec/types"
@@ -20,6 +18,7 @@ import (
 	dbm "github.com/tendermint/tm-db"
 	"google.golang.org/grpc"
 
+	"github.com/regen-network/regen-ledger/testutil"
 	regentypes "github.com/regen-network/regen-ledger/types"
 	"github.com/regen-network/regen-ledger/types/module"
 )

x/data/server/server_test.go

@@ -3,10 +3,9 @@ package server_test
 import (
 	"testing"
 
-	"github.com/regen-network/regen-ledger/types/module"
-
 	"github.com/stretchr/testify/suite"
 
+	"github.com/regen-network/regen-ledger/types/module"
 	"github.com/regen-network/regen-ledger/types/module/server"
 	datamodule "github.com/regen-network/regen-ledger/x/data/module"
 	"github.com/regen-network/regen-ledger/x/data/server/testsuite"

x/data/server/testsuite/suite.go

@@ -3,11 +3,10 @@ package testsuite
 import (
 	"context"
 
-	"github.com/regen-network/regen-ledger/testutil"
-
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/suite"
 
+	"github.com/regen-network/regen-ledger/testutil"
 	"github.com/regen-network/regen-ledger/x/data"
 )
 

x/group/client/testsuite/query_test.go

@@ -6,10 +6,11 @@ import (
 	"fmt"
 	"strconv"
 
+	tmcli "github.com/tendermint/tendermint/libs/cli"
+
 	"github.com/regen-network/regen-ledger/testutil/cli"
 	"github.com/regen-network/regen-ledger/x/group"
 	"github.com/regen-network/regen-ledger/x/group/client"
-	tmcli "github.com/tendermint/tendermint/libs/cli"
 )
 
 func (s *IntegrationTestSuite) TestQueryGroupInfo() {

x/group/client/testsuite/tx_test.go

@@ -8,22 +8,20 @@ import (
 	"strings"
 	"testing"
 
-	tmcli "github.com/tendermint/tendermint/libs/cli"
-
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/crypto/hd"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	"github.com/cosmos/cosmos-sdk/testutil"
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	banktestutil "github.com/cosmos/cosmos-sdk/x/bank/client/testutil"
 	"github.com/gogo/protobuf/proto"
+	"github.com/stretchr/testify/suite"
+	tmcli "github.com/tendermint/tendermint/libs/cli"
 
-	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/regen-network/regen-ledger/testutil/cli"
 	"github.com/regen-network/regen-ledger/testutil/network"
-
 	"github.com/regen-network/regen-ledger/x/group"
 	"github.com/regen-network/regen-ledger/x/group/client"
-	"github.com/stretchr/testify/suite"
 )
 
 type IntegrationTestSuite struct {