evmd

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 Go to latest Published: May 13, 2025 License: Apache-2.0 Imports: 148 Imported by: 5

README

Example Cosmos EVM Chain

This directory contains an example chain that uses the Cosmos EVM modules. It is based on the simapp implementation on the Cosmos SDK repository, which itself is a simplified version of a Cosmos SDK-based blockchain.

This chain implementation is used to demonstrate the integration of Cosmos EVM as well as to provide a chain object for testing purposes within the repository.

Config

By default, this chain has the following configuration:

Option Value
Binary evmd
Chain ID cosmos_262144-1
Custom Opcodes -
Default Token Pairs 1 for the native token
Denomination atest
EVM permissioning permissionless
Enabled Precompiles all

Running The Chain

To run the example, execute the local node script found within this repository:

./local_node.sh [FLAGS]

Available flags are:

  • -y: Overwrite previous database
  • -n: Do not overwrite previous database
  • --no-install: Skip installation of the binary
  • --remote-debugging: Build a binary suitable for remote debugging

Connect to Wallet

For the sake of this example, we'll be using Metamask:

  1. Use the following seed phrase when adding a new wallet: gesture inject test cycle original hollow east ridge hen combine junk child baconzero hope comfort vacuum milk pitch cage oppose unhappy lunar seat
  2. On the top left of the Metamask extension, click the Network button.
  3. Click Add custom network from the bottom of the modal.
  4. Under Default RPC URL, add the RPC URL as http://localhost:8545. Ensure your chain is running.
  5. Once added, copy the rest of the settings shown in the below images.

Button to select network Button to add network RPC URL Settings Overview of required settings

Available Cosmos SDK Modules

As mentioned above, this exemplary chain implementation is a reduced version of simapp. Specifically, instead of offering access to all Cosmos SDK modules, it just includes the following:

  • auth
  • authz
  • bank
  • capability
  • consensus
  • distribution
  • evidence
  • feegrant
  • genutil
  • gov
  • mint
  • params
  • slashing
  • staking
  • upgrade

Documentation

Index

Constants

View Source 
const (
	// ExampleChainDenom is the denomination of the Cosmos EVM example chain's base coin.
	ExampleChainDenom = "aatom"

	// ExampleDisplayDenom is the display denomination of the Cosmos EVM example chain's base coin.
	ExampleDisplayDenom = "atom"

	// EighteenDecimalsChainID is the chain ID for the 18 decimals chain.
	EighteenDecimalsChainID = "cosmos_9001"

	// SixDecimalsChainID is the chain ID for the 6 decimals chain.
	SixDecimalsChainID = "ossix_9002"

	// TwelveDecimalsChainID is the chain ID for the 12 decimals chain.
	TwelveDecimalsChainID = "ostwelve_9003"

	// TwoDecimalsChainID is the chain ID for the 2 decimals chain.
	TwoDecimalsChainID = "ostwo_9004"

	CosmosChainID = "cosmos_262144"

	// TestChainID1 is test chain IDs for IBC E2E test
	TestChainID1 = "testchain_9001"
	// TestChainID2 is test chain IDs for IBC E2E test
	TestChainID2 = "testchain_9002"

	// WEVMOSContractMainnet is the WEVMOS contract address for mainnet
	WEVMOSContractMainnet = "0xD4949664cD82660AaE99bEdc034a0deA8A0bd517"
)

Variables

View Source 
var ChainsCoinInfo = map[string]evmtypes.EvmCoinInfo{
	EighteenDecimalsChainID: {
		Denom:         ExampleChainDenom,
		ExtendedDenom: ExampleChainDenom,
		DisplayDenom:  ExampleDisplayDenom,
		Decimals:      evmtypes.EighteenDecimals,
	},
	CosmosChainID: {
		Denom:         "atest",
		ExtendedDenom: "atest",
		DisplayDenom:  "test",
		Decimals:      evmtypes.EighteenDecimals,
	},
}

ChainsCoinInfo is a map of the chain id and its corresponding EvmCoinInfo that allows initializing the app with different coin info based on the chain id

View Source 
var (
	// DefaultNodeHome default home directories for the application daemon
	DefaultNodeHome string
)

Functions

func BlockedAddresses 

func BlockedAddresses() map[string]bool

BlockedAddresses returns all the app's blocked account addresses.

Note, this includes:

  • module accounts
  • Ethereum's native precompiled smart contracts
  • Cosmos EVM' available static precompiled contracts

func EvmAppOptions 

func EvmAppOptions(chainID string) error

EvmAppOptions allows to setup the global configuration for the Cosmos EVM chain.

func GetMaccPerms 

func GetMaccPerms() map[string][]string

GetMaccPerms returns a copy of the module account permissions

func NewAvailableStaticPrecompiles 

func NewAvailableStaticPrecompiles(
	stakingKeeper stakingkeeper.Keeper,
	distributionKeeper distributionkeeper.Keeper,
	bankKeeper cmn.BankKeeper,
	erc20Keeper erc20Keeper.Keeper,
	transferKeeper transferkeeper.Keeper,
	channelKeeper *channelkeeper.Keeper,
	evmKeeper *evmkeeper.Keeper,
	govKeeper govkeeper.Keeper,
	slashingKeeper slashingkeeper.Keeper,
	evidenceKeeper evidencekeeper.Keeper,
) map[common.Address]vm.PrecompiledContract

NewAvailableStaticPrecompiles returns the list of all available static precompiled contracts from Cosmos EVM.

NOTE: this should only be used during initialization of the Keeper.

func NewEVMGenesisState 

func NewEVMGenesisState() *evmtypes.GenesisState

NewEVMGenesisState returns the default genesis state for the EVM module.

NOTE: for the example chain implementation we need to set the default EVM denomination and enable ALL precompiles.

func NewErc20GenesisState 

func NewErc20GenesisState() *erc20types.GenesisState

NewErc20GenesisState returns the default genesis state for the ERC20 module.

NOTE: for the example chain implementation we are also adding a default token pair, which is the base denomination of the chain (i.e. the WEVMOS contract).

func NewFeeMarketGenesisState 

func NewFeeMarketGenesisState() *feemarkettypes.GenesisState

NewFeeMarketGenesisState returns the default genesis state for the feemarket module.

NOTE: for the example chain implementation we are disabling the base fee.

func NewMintGenesisState 

func NewMintGenesisState() *minttypes.GenesisState

NewMintGenesisState returns the default genesis state for the mint module.

NOTE: for the example chain implementation we are also adding a default minter.

func NoOpEVMOptions 

func NoOpEVMOptions(_ string) error

NoOpEVMOptions is a no-op function that can be used when the app does not need any specific configuration.

func SetupTestingApp 

func SetupTestingApp(chainID string) func() (ibctesting.TestingApp, map[string]json.RawMessage)

SetupTestingApp initializes the IBC-go testing application need to keep this design to comply with the ibctesting SetupTestingApp func and be able to set the chainID for the tests properly

Types

type BankKeeper 

type BankKeeper interface {
	evmtypes.BankKeeper
	cmn.BankKeeper
}

type EVMD 

type EVMD struct {
	*baseapp.BaseApp

	// keepers
	AccountKeeper         authkeeper.AccountKeeper
	BankKeeper            bankkeeper.Keeper
	StakingKeeper         *stakingkeeper.Keeper
	SlashingKeeper        slashingkeeper.Keeper
	MintKeeper            mintkeeper.Keeper
	DistrKeeper           distrkeeper.Keeper
	GovKeeper             govkeeper.Keeper
	UpgradeKeeper         *upgradekeeper.Keeper
	ParamsKeeper          paramskeeper.Keeper
	AuthzKeeper           authzkeeper.Keeper
	EvidenceKeeper        evidencekeeper.Keeper
	FeeGrantKeeper        feegrantkeeper.Keeper
	ConsensusParamsKeeper consensusparamkeeper.Keeper

	// IBC keepers
	IBCKeeper      *ibckeeper.Keeper // IBC Keeper must be a pointer in the app, so we can SetRouter on it correctly
	TransferKeeper transferkeeper.Keeper

	// Cosmos EVM keepers
	FeeMarketKeeper   feemarketkeeper.Keeper
	EVMKeeper         *evmkeeper.Keeper
	Erc20Keeper       erc20keeper.Keeper
	PreciseBankKeeper precisebankkeeper.Keeper

	// the module manager
	ModuleManager      *module.Manager
	BasicModuleManager module.BasicManager
	// contains filtered or unexported fields
}

EVMD extends an ABCI application, but with most of its parameters exported.

func NewExampleApp 

func NewExampleApp(
	logger log.Logger,
	db dbm.DB,
	traceStore io.Writer,
	loadLatest bool,
	appOpts servertypes.AppOptions,
	evmAppOptions EVMOptionsFn,
	baseAppOptions ...func(*baseapp.BaseApp),
) *EVMD

NewExampleApp returns a reference to an initialized EVMD.

func Setup 

func Setup(t *testing.T, chainID string) *EVMD

Setup initializes a new EVMD. A Nop logger is set in EVMD.

func SetupWithGenesisValSet 

func SetupWithGenesisValSet(t *testing.T, chainID string, valSet *cmttypes.ValidatorSet, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *EVMD

SetupWithGenesisValSet initializes a new EVMD with a validator set and genesis accounts that also act as delegators. For simplicity, each validator is bonded with a delegation of one consensus engine unit in the default token of the simapp from first genesis account. A Nop logger is set in EVMD.

func (*EVMD) AppCodec 

func (app *EVMD) AppCodec() codec.Codec

AppCodec returns EVMD'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 (*EVMD) AutoCliOpts 

func (app *EVMD) AutoCliOpts() autocli.AppOptions

AutoCliOpts returns the autocli options for the app.

func (*EVMD) BeginBlocker 

func (app *EVMD) BeginBlocker(ctx sdk.Context) (sdk.BeginBlock, error)

BeginBlocker application updates every begin block

func (*EVMD) Configurator 

func (app *EVMD) Configurator() module.Configurator

func (*EVMD) DefaultGenesis 

func (app *EVMD) DefaultGenesis() map[string]json.RawMessage

DefaultGenesis returns a default genesis from the registered AppModuleBasic's.

func (*EVMD) EndBlocker 

func (app *EVMD) EndBlocker(ctx sdk.Context) (sdk.EndBlock, error)

EndBlocker application updates every end block

func (*EVMD) ExportAppStateAndValidators 

func (app *EVMD) ExportAppStateAndValidators(forZeroHeight bool, jailAllowedAddrs []string, modulesToExport []string) (servertypes.ExportedApp, error)

ExportAppStateAndValidators exports the state of the application for a genesis file.

func (*EVMD) FinalizeBlock 

func (app *EVMD) FinalizeBlock(req *abci.RequestFinalizeBlock) (res *abci.ResponseFinalizeBlock, err error)

func (*EVMD) GetBaseApp 

func (app *EVMD) GetBaseApp() *baseapp.BaseApp

GetBaseApp implements the TestingApp interface.

func (*EVMD) GetIBCKeeper 

func (app *EVMD) GetIBCKeeper() *ibckeeper.Keeper

GetIBCKeeper implements the TestingApp interface.

func (*EVMD) GetKey 

func (app *EVMD) GetKey(storeKey string) *storetypes.KVStoreKey

GetKey returns the KVStoreKey for the provided store key.

NOTE: This is solely to be used for testing purposes.

func (*EVMD) GetMemKey 

func (app *EVMD) GetMemKey(storeKey string) *storetypes.MemoryStoreKey

GetMemKey returns the MemStoreKey for the provided mem key.

NOTE: This is solely used for testing purposes.

func (*EVMD) GetStakingKeeperSDK 

func (app *EVMD) GetStakingKeeperSDK() stakingkeeper.Keeper

GetStakingKeeperSDK implements the TestingApp interface.

func (*EVMD) GetSubspace 

func (app *EVMD) GetSubspace(moduleName string) paramstypes.Subspace

GetSubspace returns a param subspace for a given module name.

NOTE: This is solely to be used for testing purposes.

func (*EVMD) GetTKey 

func (app *EVMD) GetTKey(storeKey string) *storetypes.TransientStoreKey

GetTKey returns the TransientStoreKey for the provided store key.

NOTE: This is solely to be used for testing purposes.

func (*EVMD) GetTxConfig 

func (app *EVMD) GetTxConfig() client.TxConfig

GetTxConfig implements the TestingApp interface.

func (*EVMD) InitChainer 

func (app *EVMD) InitChainer(ctx sdk.Context, req *abci.RequestInitChain) (*abci.ResponseInitChain, error)

InitChainer application update at chain initialization

func (*EVMD) InterfaceRegistry 

func (app *EVMD) InterfaceRegistry() types.InterfaceRegistry

InterfaceRegistry returns EVMD's InterfaceRegistry

func (*EVMD) LegacyAmino 

func (app *EVMD) LegacyAmino() *codec.LegacyAmino

LegacyAmino returns EVMD'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 (*EVMD) LoadHeight 

func (app *EVMD) LoadHeight(height int64) error

LoadHeight loads a particular height

func (*EVMD) Name 

func (app *EVMD) Name() string

Name returns the name of the App

func (*EVMD) PreBlocker 

func (app *EVMD) PreBlocker(ctx sdk.Context, _ *abci.RequestFinalizeBlock) (*sdk.ResponsePreBlock, error)

func (*EVMD) RegisterAPIRoutes 

func (app *EVMD) RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APIConfig)

RegisterAPIRoutes registers all application module routes with the provided API server.

func (*EVMD) RegisterNodeService 

func (app *EVMD) RegisterNodeService(clientCtx client.Context, cfg config.Config)

func (*EVMD) RegisterTendermintService 

func (app *EVMD) RegisterTendermintService(clientCtx client.Context)

RegisterTendermintService implements the Application.RegisterTendermintService method.

func (*EVMD) RegisterTxService 

func (app *EVMD) RegisterTxService(clientCtx client.Context)

RegisterTxService implements the Application.RegisterTxService method.

func (EVMD) RegisterUpgradeHandlers 

func (app EVMD) RegisterUpgradeHandlers()

func (*EVMD) SimulationManager 

func (app *EVMD) SimulationManager() *module.SimulationManager

SimulationManager implements the SimulationApp interface

func (*EVMD) TxConfig 

func (app *EVMD) TxConfig() client.TxConfig

TxConfig returns EVMD's TxConfig

type EVMOptionsFn 

type EVMOptionsFn func(string) error

EVMOptionsFn defines a function type for setting app options specifically for the Cosmos EVM app. The function should receive the chainID and return an error if any.

type GenesisState 

type GenesisState map[string]json.RawMessage

GenesisState of the blockchain is represented here as a map of raw json messages key'd by an identifier string. The identifier is used to determine which module genesis information belongs to so it may be appropriately routed during init chain. Within this application default genesis information is retrieved from the ModuleBasicManager which populates json from each BasicModule object provided to it during init.

type SetupOptions 

type SetupOptions struct {
	Logger  log.Logger
	DB      *dbm.MemDB
	AppOpts servertypes.AppOptions
}

SetupOptions defines arguments that are passed into `Simapp` constructor.

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