evm

README

EVM support

This package and subpackages contain the code for the evm core contract, which allows to execute Ethereum VM (EVM) code on top of the ISC chain, thus adding support for Ethereum smart contracts.

JSON-RPC

The Wasp node provides a JSON-RPC service at /chain/<isc-chainid>/evm/jsonrpc. This will allow you to connect any standard Ethereum tool, like Metamask. You can check the Metamask connection parameters for any given ISC chain in the Dashboard.

Complete example using wasp-cluster

1. Start a test cluster:

   wasp-cluster start -d
   

2. In a different terminal, initialize a private key and request some iotas from the faucet:

   wasp-cli init
   wasp-cli request-funds
   

3. Deploy an ISC chain with an arbitrary Ethereum chain ID (which should be different from any standard Ethereum chain IDs -- see https://chainlist.org):

   wasp-cli chain deploy --chain=mychain --evm-chainid 1234
   

4. Send some iotas from your L1 account to any Ethereum account on L2 (e.g. to cover for gas fees):

   wasp-cli chain deposit 0xa1b2c3d4... iota:1000000
   

5. Visit the Wasp dashboard (<URL>/wasp/dashboard when using node-docker-setup), go to Chains, then to your ISC chain, scroll down and you will find the EVM section with the JSON-RPC URL for Metamask or any other Ethereum tool.

You can now deploy an EVM contract like you would on Ethereum.

For more information check out the docs.

Documentation

Index

• Constants
• Variables

Constants

const (
	FieldTransaction      = evmnames.FieldTransaction
	FieldCallMsg          = evmnames.FieldCallMsg
	FieldChainID          = evmnames.FieldChainID
	FieldAddress          = evmnames.FieldAddress
	FieldKey              = evmnames.FieldKey
	FieldAgentID          = evmnames.FieldAgentID
	FieldTransactionIndex = evmnames.FieldTransactionIndex
	FieldTransactionHash  = evmnames.FieldTransactionHash
	FieldResult           = evmnames.FieldResult
	FieldBlockNumber      = evmnames.FieldBlockNumber
	FieldBlockHash        = evmnames.FieldBlockHash
	FieldFilterQuery      = evmnames.FieldFilterQuery
	FieldBlockKeepAmount  = evmnames.FieldBlockKeepAmount // int32

	FieldNativeTokenID      = evmnames.FieldNativeTokenID
	FieldFoundrySN          = evmnames.FieldFoundrySN         // uint32
	FieldTokenName          = evmnames.FieldTokenName         // string
	FieldTokenTickerSymbol  = evmnames.FieldTokenTickerSymbol // string
	FieldTokenDecimals      = evmnames.FieldTokenDecimals     // uint8
	FieldNFTCollectionID    = evmnames.FieldNFTCollectionID   // NFTID
	FieldFoundryTokenScheme = evmnames.FieldFoundryTokenScheme
	FieldTargetAddress      = evmnames.FieldTargetAddress
)

const (
	// TODO shouldn't this be different between chain, to prevent replay attacks? (maybe derived from ISC ChainID)
	DefaultChainID = uint16(1074) // IOTA -- get it?

	BlockKeepAll           = -1
	BlockKeepAmountDefault = int32(BlockKeepAll)
)

const (
	// KeyEVMState is the subrealm prefix for the EVM state, used by the emulator
	KeyEVMState = "s"

	// KeyISCMagic is the subrealm prefix for the ISC magic contract
	KeyISCMagic = "m"
)

Variables

var (
	// EVM state
	FuncSendTransaction = coreutil.Func(evmnames.FuncSendTransaction)
	FuncCallContract    = coreutil.Func(evmnames.FuncCallContract)
	FuncGetChainID      = coreutil.ViewFunc(evmnames.FuncGetChainID)

	FuncRegisterERC20NativeToken              = coreutil.Func(evmnames.FuncRegisterERC20NativeToken)
	FuncRegisterERC20NativeTokenOnRemoteChain = coreutil.Func(evmnames.FuncRegisterERC20NativeTokenOnRemoteChain)
	FuncRegisterERC20ExternalNativeToken      = coreutil.Func(evmnames.FuncRegisterERC20ExternalNativeToken)
	FuncGetERC20ExternalNativeTokenAddress    = coreutil.ViewFunc(evmnames.FuncGetERC20ExternalNativeTokenAddress)
	FuncRegisterERC721NFTCollection           = coreutil.Func(evmnames.FuncRegisterERC721NFTCollection)

	// block context
	FuncOpenBlockContext  = coreutil.Func(evmnames.FuncOpenBlockContext)
	FuncCloseBlockContext = coreutil.Func(evmnames.FuncCloseBlockContext)
)

var Contract = coreutil.NewContract(evmnames.Contract, "EVM contract")

var GasPrice = big.NewInt(0)

Gas is charged in isc VM (L1 currencies), not ETH