module.go

// Package gov defines the gov module.
package gov

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

	"github.com/gorilla/mux"
	"github.com/spf13/cobra"

	abci "github.com/tendermint/tendermint/abci/types"

	"github.com/cosmos/cosmos-sdk/client/context"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	"github.com/cosmos/cosmos-sdk/x/gov"
	"github.com/cosmos/cosmos-sdk/x/gov/client"
	govrest "github.com/cosmos/cosmos-sdk/x/gov/client/rest"
	govSim "github.com/cosmos/cosmos-sdk/x/gov/simulation"
	govTypes "github.com/cosmos/cosmos-sdk/x/gov/types"
	sim "github.com/cosmos/cosmos-sdk/x/simulation"

	"github.com/certikfoundation/shentu/x/gov/client/cli"
	"github.com/certikfoundation/shentu/x/gov/client/rest"
	"github.com/certikfoundation/shentu/x/gov/keeper"
	"github.com/certikfoundation/shentu/x/gov/simulation"
	"github.com/certikfoundation/shentu/x/gov/types"
)

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

// AppModuleBasic is the app module basics object.
type AppModuleBasic struct {
	proposalHandlers []client.ProposalHandler // proposal handlers which live in governance cli and rest
}

// NewAppModuleBasic creates a new AppModuleBasic object.
func NewAppModuleBasic(proposalHandlers ...client.ProposalHandler) AppModuleBasic {
	return AppModuleBasic{
		proposalHandlers: proposalHandlers,
	}
}

// Name returns the gov module's name.
func (AppModuleBasic) Name() string {
	return gov.AppModuleBasic{}.Name()
}

// RegisterCodec registers gov's necessary types and interfaces
func (AppModuleBasic) RegisterCodec(cdc *codec.Codec) {
	gov.RegisterCodec(cdc)
}

// DefaultGenesis returns the default genesis state.
func (AppModuleBasic) DefaultGenesis() json.RawMessage {
	return gov.ModuleCdc.MustMarshalJSON(types.DefaultGenesisState())
}

// ValidateGenesis validates the module genesis.
func (AppModuleBasic) ValidateGenesis(bz json.RawMessage) error {
	var data types.GenesisState
	if err := gov.ModuleCdc.UnmarshalJSON(bz, &data); err != nil {
		return fmt.Errorf("failed to unmarshal %s genesis state: %w", ModuleName, err)
	}

	return types.ValidateGenesis(data)
}

// RegisterRESTRoutes registers REST routes for the module.
func (a AppModuleBasic) RegisterRESTRoutes(ctx context.CLIContext, rtr *mux.Router) {
	proposalRESTHandlers := make([]govrest.ProposalRESTHandler, 0, len(a.proposalHandlers))
	for _, proposalHandler := range a.proposalHandlers {
		proposalRESTHandlers = append(proposalRESTHandlers, proposalHandler.RESTHandler(ctx))
	}

	rest.RegisterRoutes(ctx, rtr, proposalRESTHandlers)
}

// GetTxCmd gets the root tx command of this module.
func (a AppModuleBasic) GetTxCmd(cdc *codec.Codec) *cobra.Command {
	proposalCLIHandlers := make([]*cobra.Command, 0, len(a.proposalHandlers))
	for _, proposalHandler := range a.proposalHandlers {
		proposalCLIHandlers = append(proposalCLIHandlers, proposalHandler.CLIHandler(cdc))
	}

	return cli.GetTxCmd(StoreKey, cdc, proposalCLIHandlers)
}

// GetQueryCmd gets the root query command of this module.
func (AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command {
	return cli.GetQueryCmd(StoreKey, cdc)
}

// AppModule is the main ctk module app type.
type AppModule struct {
	AppModuleBasic
	authKeeper   govTypes.AccountKeeper
	supplyKeeper govTypes.SupplyKeeper
	keeper       keeper.Keeper
}

// NewAppModule creates a new AppModule object.
func NewAppModule(
	govKeeper keeper.Keeper,
	authKeeper govTypes.AccountKeeper,
	supplyKeeper govTypes.SupplyKeeper,
) AppModule {
	return AppModule{
		AppModuleBasic: AppModuleBasic{},
		authKeeper:     authKeeper,
		supplyKeeper:   supplyKeeper,
		keeper:         govKeeper,
	}
}

// Name returns the governance module's name.
func (am AppModule) Name() string {
	return ModuleName
}

// RegisterInvariants registers the governance module invariants.
func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {}

// Route returns the message routing key for the governance module.
func (am AppModule) Route() string {
	return RouterKey
}

// NewHandler returns an sdk.Handler for the governance module.
func (am AppModule) NewHandler() sdk.Handler {
	return NewHandler(am.keeper)
}

// QuerierRoute returns the governance module's querier route name.
func (am AppModule) QuerierRoute() string {
	return QuerierRoute
}

// NewQuerierHandler returns the governance module sdk.Querier.
func (am AppModule) NewQuerierHandler() sdk.Querier {
	return keeper.NewQuerier(am.keeper)
}

// InitGenesis performs genesis initialization for the governance module.
func (am AppModule) InitGenesis(ctx sdk.Context, data json.RawMessage) []abci.ValidatorUpdate {
	var genesisState types.GenesisState
	gov.ModuleCdc.MustUnmarshalJSON(data, &genesisState)
	InitGenesis(ctx, am.keeper, am.supplyKeeper, genesisState)
	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns the exported genesis state as raw bytes for the governance module.
func (am AppModule) ExportGenesis(ctx sdk.Context) json.RawMessage {
	gs := ExportGenesis(ctx, am.keeper)
	return gov.ModuleCdc.MustMarshalJSON(gs)
}

// BeginBlock implements the Cosmos SDK BeginBlock module function.
func (am AppModule) BeginBlock(ctx sdk.Context, rbb abci.RequestBeginBlock) {}

// EndBlock implements the Cosmos SDK EndBlock module function.
func (am AppModule) EndBlock(ctx sdk.Context, rbb abci.RequestEndBlock) []abci.ValidatorUpdate {
	EndBlocker(ctx, am.keeper)
	return []abci.ValidatorUpdate{}
}

// GenerateGenesisState creates a randomized GenState of this module.
func (AppModuleBasic) GenerateGenesisState(simState *module.SimulationState) {
	simulation.RandomizedGenState(simState)
}

// RegisterStoreDecoder registers a decoder for gov module.
func (AppModuleBasic) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
	sdr[StoreKey] = simulation.DecodeStore
}

// WeightedOperations returns the all the gov module operations with their respective weights.
func (am AppModule) WeightedOperations(simState module.SimulationState) []sim.WeightedOperation {
	return simulation.WeightedOperations(simState.AppParams, simState.Cdc, am.authKeeper, am.keeper.CertKeeper, am.keeper, simState.Contents)
}

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

// ProposalContents returns all the gov content functions used to
// simulate governance proposals.
func (AppModule) ProposalContents(_ module.SimulationState) []sim.WeightedProposalContent {
	return govSim.ProposalContents()
}