module.go

package transfer

import (
	"context"
	"encoding/json"
	"fmt"
	"math/rand"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
	"github.com/gorilla/mux"
	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/spf13/cobra"
	abci "github.com/tendermint/tendermint/abci/types"

	"github.com/cosmos/ibc-go/v4/modules/apps/transfer/client/cli"
	"github.com/cosmos/ibc-go/v4/modules/apps/transfer/keeper"
	"github.com/cosmos/ibc-go/v4/modules/apps/transfer/simulation"
	"github.com/cosmos/ibc-go/v4/modules/apps/transfer/types"
	porttypes "github.com/cosmos/ibc-go/v4/modules/core/05-port/types"
)

var (
	_ module.AppModule      = AppModule{}
	_ module.AppModuleBasic = AppModuleBasic{}
	_ porttypes.IBCModule   = IBCModule{}
)

// AppModuleBasic is the IBC Transfer AppModuleBasic
type AppModuleBasic struct{}

// Name implements AppModuleBasic interface
func (AppModuleBasic) Name() string {
	return types.ModuleName
}

// RegisterLegacyAminoCodec implements AppModuleBasic interface
func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {
	types.RegisterLegacyAminoCodec(cdc)
}

// RegisterInterfaces registers module concrete types into protobuf Any.
func (AppModuleBasic) RegisterInterfaces(registry codectypes.InterfaceRegistry) {
	types.RegisterInterfaces(registry)
}

// DefaultGenesis returns default genesis state as raw bytes for the ibc
// transfer module.
func (AppModuleBasic) DefaultGenesis(cdc codec.JSONCodec) json.RawMessage {
	return cdc.MustMarshalJSON(types.DefaultGenesisState())
}

// ValidateGenesis performs genesis state validation for the ibc transfer module.
func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, config client.TxEncodingConfig, bz json.RawMessage) error {
	var gs types.GenesisState
	if err := cdc.UnmarshalJSON(bz, &gs); err != nil {
		return fmt.Errorf("failed to unmarshal %s genesis state: %w", types.ModuleName, err)
	}

	return gs.Validate()
}

// RegisterRESTRoutes implements AppModuleBasic interface
func (AppModuleBasic) RegisterRESTRoutes(clientCtx client.Context, rtr *mux.Router) {
}

// RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the ibc-transfer module.
func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *runtime.ServeMux) {
	types.RegisterQueryHandlerClient(context.Background(), mux, types.NewQueryClient(clientCtx))
}

// GetTxCmd implements AppModuleBasic interface
func (AppModuleBasic) GetTxCmd() *cobra.Command {
	return cli.NewTxCmd()
}

// GetQueryCmd implements AppModuleBasic interface
func (AppModuleBasic) GetQueryCmd() *cobra.Command {
	return cli.GetQueryCmd()
}

// AppModule represents the AppModule for this module
type AppModule struct {
	AppModuleBasic
	keeper keeper.Keeper
}

// NewAppModule creates a new 20-transfer module
func NewAppModule(k keeper.Keeper) AppModule {
	return AppModule{
		keeper: k,
	}
}

// RegisterInvariants implements the AppModule interface
func (AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
	// TODO
}

// Route implements the AppModule interface
func (am AppModule) Route() sdk.Route {
	return sdk.Route{}
}

// QuerierRoute implements the AppModule interface
func (AppModule) QuerierRoute() string {
	return types.QuerierRoute
}

// LegacyQuerierHandler implements the AppModule interface
func (am AppModule) LegacyQuerierHandler(*codec.LegacyAmino) sdk.Querier {
	return nil
}

// RegisterServices registers module services.
func (am AppModule) RegisterServices(cfg module.Configurator) {
	types.RegisterMsgServer(cfg.MsgServer(), am.keeper)
	types.RegisterQueryServer(cfg.QueryServer(), am.keeper)

	m := keeper.NewMigrator(am.keeper)
	if err := cfg.RegisterMigration(types.ModuleName, 1, m.MigrateTraces); err != nil {
		panic(fmt.Sprintf("failed to migrate transfer app from version 1 to 2: %v", err))
	}
}

// InitGenesis performs genesis initialization for the ibc-transfer module. It returns
// no validator updates.
func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, data json.RawMessage) []abci.ValidatorUpdate {
	var genesisState types.GenesisState
	cdc.MustUnmarshalJSON(data, &genesisState)
	am.keeper.InitGenesis(ctx, genesisState)
	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns the exported genesis state as raw bytes for the ibc-transfer
// module.
func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
	gs := am.keeper.ExportGenesis(ctx)
	return cdc.MustMarshalJSON(gs)
}

// ConsensusVersion implements AppModule/ConsensusVersion.
func (AppModule) ConsensusVersion() uint64 { return 2 }

// BeginBlock implements the AppModule interface
func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
}

// EndBlock implements the AppModule interface
func (am AppModule) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) []abci.ValidatorUpdate {
	return []abci.ValidatorUpdate{}
}

// AppModuleSimulation functions

// GenerateGenesisState creates a randomized GenState of the transfer module.
func (AppModule) GenerateGenesisState(simState *module.SimulationState) {
	simulation.RandomizedGenState(simState)
}

// ProposalContents doesn't return any content functions for governance proposals.
func (AppModule) ProposalContents(_ module.SimulationState) []simtypes.WeightedProposalContent {
	return nil
}

// RandomizedParams creates randomized ibc-transfer param changes for the simulator.
func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
	return simulation.ParamChanges(r)
}

// RegisterStoreDecoder registers a decoder for transfer module's types
func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
	sdr[types.StoreKey] = simulation.NewDecodeStore(am.keeper)
}

// WeightedOperations returns the all the transfer module operations with their respective weights.
func (am AppModule) WeightedOperations(_ module.SimulationState) []simtypes.WeightedOperation {
	return nil
}