backend

package
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 Go to latest Published: Jan 19, 2024 License: LGPL-3.0 Imports: 51 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func AllTxLogsFromEvents 

func AllTxLogsFromEvents(events []abci.Event) ([][]*ethtypes.Log, error)

AllTxLogsFromEvents parses all ethereum logs from cosmos events

func GetLogsFromBlockResults 

func GetLogsFromBlockResults(blockRes *tmrpctypes.ResultBlockResults) ([][]*ethtypes.Log, error)

GetLogsFromBlockResults returns the list of event logs from the tendermint block result response

func ParseTxLogsFromEvent 

func ParseTxLogsFromEvent(event abci.Event) ([]*ethtypes.Log, error)

ParseTxLogsFromEvent parse tx logs from one event

func ShouldIgnoreGasUsed 

func ShouldIgnoreGasUsed(res *abci.ResponseDeliverTx) bool

ShouldIgnoreGasUsed returns true if the gasUsed in result should be ignored workaround for issue: https://github.com/cosmos/cosmos-sdk/issues/10832

func TxLogsFromEvents 

func TxLogsFromEvents(events []abci.Event, msgIndex int) ([]*ethtypes.Log, error)

TxLogsFromEvents parses ethereum logs from cosmos events for specific msg index

Types

type Backend 

type Backend struct {
	// contains filtered or unexported fields
}

Backend implements the BackendI interface

func NewBackend 

func NewBackend(
	ctx *server.Context,
	logger log.Logger,
	clientCtx client.Context,
	allowUnprotectedTxs bool,
	indexer ethermint.EVMTxIndexer,
) *Backend

NewBackend creates a new Backend instance for cosmos and ethereum namespaces

func (*Backend) Accounts 

func (b *Backend) Accounts() ([]common.Address, error)

Accounts returns the list of accounts available to this node.

func (*Backend) BaseFee 

func (b *Backend) BaseFee(blockRes *tmrpctypes.ResultBlockResults) (*big.Int, error)

BaseFee returns the base fee tracked by the Fee Market module. If the base fee is not enabled globally, the query returns nil. If the London hard fork is not activated at the current height, the query will return nil.

func (*Backend) BlockBloom 

func (b *Backend) BlockBloom(blockRes *tmrpctypes.ResultBlockResults) (ethtypes.Bloom, error)

BlockBloom query block bloom filter from block results

func (*Backend) BlockByHash 

func (b *Backend) BlockByHash(hash common.Hash) (*ethtypes.Block, error)

BlockByHash returns the block identified by hash.

func (*Backend) BlockByNumber 

func (b *Backend) BlockByNumber(blockNum rpctypes.BlockNumber) (*ethtypes.Block, error)

BlockByNumber returns the block identified by number.

func (*Backend) BlockNumber 

func (b *Backend) BlockNumber() (hexutil.Uint64, error)

BlockNumber returns the current block number in abci app state. Because abci app state could lag behind from tendermint latest block, it's more stable for the client to use the latest block number in abci app state than tendermint rpc.

func (*Backend) BloomStatus 

func (b *Backend) BloomStatus() (uint64, uint64)

BloomStatus returns the BloomBitsBlocks and the number of processed sections maintained by the chain indexer.

func (*Backend) ChainConfig 

func (b *Backend) ChainConfig() *params.ChainConfig

ChainConfig returns the latest ethereum chain configuration

func (*Backend) ChainID 

func (b *Backend) ChainID() (*hexutil.Big, error)

ChainID is the EIP-155 replay-protection chain id for the current ethereum chain config.

func (*Backend) CurrentHeader 

func (b *Backend) CurrentHeader() *ethtypes.Header

CurrentHeader returns the latest block header

func (*Backend) DoCall 

func (b *Backend) DoCall(
	args evmtypes.TransactionArgs, blockNr rpctypes.BlockNumber,
) (*evmtypes.MsgEthereumTxResponse, error)

DoCall performs a simulated call operation through the evmtypes. It returns the estimated gas used on the operation or an error if fails.

func (*Backend) EstimateGas 

func (b *Backend) EstimateGas(args evmtypes.TransactionArgs, blockNrOptional *rpctypes.BlockNumber) (hexutil.Uint64, error)

EstimateGas returns an estimate of gas usage for the given smart contract call.

func (*Backend) EthBlockFromTendermint 

func (b *Backend) EthBlockFromTendermint(
	resBlock *tmrpctypes.ResultBlock,
	blockRes *tmrpctypes.ResultBlockResults,
	fullTx bool,
) (map[string]interface{}, error)

EthBlockFromTendermint returns a JSON-RPC compatible Ethereum block from a given Tendermint block and its block result.

func (*Backend) EthBlockFromTm 

func (b *Backend) EthBlockFromTm(resBlock *tmrpctypes.ResultBlock, blockRes *tmrpctypes.ResultBlockResults) (*ethtypes.Block, error)

Returns and Ethereum Block type from Tendermint block

func (*Backend) FeeHistory 

func (b *Backend) FeeHistory(
	userBlockCount rpc.DecimalOrHex,
	lastBlock rpc.BlockNumber,
	rewardPercentiles []float64,
) (*rpctypes.FeeHistoryResult, error)

FeeHistory returns data relevant for fee estimation based on the specified range of blocks.

func (*Backend) GetBalance 

func (b *Backend) GetBalance(address common.Address, blockNrOrHash rpctypes.BlockNumberOrHash) (*hexutil.Big, error)

GetBalance returns the provided account's balance up to the provided block number.

func (*Backend) GetBlockByHash 

func (b *Backend) GetBlockByHash(hash common.Hash, fullTx bool) (map[string]interface{}, error)

GetBlockByHash returns the block identified by hash.

func (*Backend) GetBlockByNumber 

func (b *Backend) GetBlockByNumber(blockNum rpctypes.BlockNumber, fullTx bool) (map[string]interface{}, error)

GetBlockByNumber returns the block identified by number.

func (*Backend) GetBlockNumber 

func (b *Backend) GetBlockNumber(blockNrOrHash rpctypes.BlockNumberOrHash) (rpctypes.BlockNumber, error)

getBlockNumber returns the BlockNumber from BlockNumberOrHash

func (*Backend) GetBlockNumberByHash 

func (b *Backend) GetBlockNumberByHash(blockHash common.Hash) (*big.Int, error)

GetBlockNumberByHash returns the block height of given block hash

func (*Backend) GetBlockTransactionCountByHash 

func (b *Backend) GetBlockTransactionCountByHash(hash common.Hash) *hexutil.Uint

GetBlockTransactionCountByHash returns the number of transactions in the block identified by hash.

func (*Backend) GetBlockTransactionCountByNumber 

func (b *Backend) GetBlockTransactionCountByNumber(blockNum rpctypes.BlockNumber) *hexutil.Uint

GetBlockTransactionCountByNumber returns the number of transactions in the block identified by number.

func (*Backend) GetCode 

func (b *Backend) GetCode(address common.Address, blockNrOrHash rpctypes.BlockNumberOrHash) (hexutil.Bytes, error)

GetCode returns the contract code at the given address and block number.

func (*Backend) GetCoinbase 

func (b *Backend) GetCoinbase() (sdk.AccAddress, error)

GetCoinbase is the address that staking rewards will be send to (alias for Etherbase).

func (*Backend) GetEthereumMsgsFromTendermintBlock 

func (b *Backend) GetEthereumMsgsFromTendermintBlock(
	resBlock *tmrpctypes.ResultBlock,
	blockRes *tmrpctypes.ResultBlockResults,
) []*evmtypes.MsgEthereumTx

GetEthereumMsgsFromTendermintBlock returns all real MsgEthereumTxs from a Tendermint block. It also ensures consistency over the correct txs indexes across RPC endpoints

func (*Backend) GetLogs 

func (b *Backend) GetLogs(hash common.Hash) ([][]*ethtypes.Log, error)

GetLogs returns all the logs from all the ethereum transactions in a block.

func (*Backend) GetLogsByHeight 

func (b *Backend) GetLogsByHeight(height *int64) ([][]*ethtypes.Log, error)

GetLogsByHeight returns all the logs from all the ethereum transactions in a block.

func (*Backend) GetProof 

func (b *Backend) GetProof(address common.Address, storageKeys []string, blockNrOrHash rpctypes.BlockNumberOrHash) (*rpctypes.AccountResult, error)

GetProof returns an account object with proof and any storage proofs

func (*Backend) GetStorageAt 

func (b *Backend) GetStorageAt(address common.Address, key string, blockNrOrHash rpctypes.BlockNumberOrHash) (hexutil.Bytes, error)

GetStorageAt returns the contract storage at the given address, block number, and key.

func (*Backend) GetTendermintBlockByHash 

func (b *Backend) GetTendermintBlockByHash(blockHash common.Hash) (*tmrpctypes.ResultBlock, error)

GetTendermintBlockByHash returns a Tendermint format block by block number

func (*Backend) GetTendermintBlockByNumber 

func (b *Backend) GetTendermintBlockByNumber(blockNum rpctypes.BlockNumber) (*tmrpctypes.ResultBlock, error)

GetTendermintBlockByNumber returns a Tendermint formatted block for a given block number

func (*Backend) GetTendermintBlockResultByNumber 

func (b *Backend) GetTendermintBlockResultByNumber(height *int64) (*tmrpctypes.ResultBlockResults, error)

GetTendermintBlockResultByNumber returns a Tendermint-formatted block result by block number

func (*Backend) GetTransactionByBlockAndIndex 

func (b *Backend) GetTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)

getTransactionByBlockAndIndex is the common code shared by `GetTransactionByBlockNumberAndIndex` and `GetTransactionByBlockHashAndIndex`.

func (*Backend) GetTransactionByBlockHashAndIndex 

func (b *Backend) GetTransactionByBlockHashAndIndex(hash common.Hash, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)

GetTransactionByBlockHashAndIndex returns the transaction identified by hash and index.

func (*Backend) GetTransactionByBlockNumberAndIndex 

func (b *Backend) GetTransactionByBlockNumberAndIndex(blockNum rpctypes.BlockNumber, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)

GetTransactionByBlockNumberAndIndex returns the transaction identified by number and index.

func (*Backend) GetTransactionByHash 

func (b *Backend) GetTransactionByHash(txHash common.Hash) (*rpctypes.RPCTransaction, error)

GetTransactionByHash returns the Ethereum format transaction identified by Ethereum transaction hash

func (*Backend) GetTransactionCount 

func (b *Backend) GetTransactionCount(address common.Address, blockNum rpctypes.BlockNumber) (*hexutil.Uint64, error)

GetTransactionCount returns the number of transactions at the given address up to the given block number.

func (*Backend) GetTransactionReceipt 

func (b *Backend) GetTransactionReceipt(hash common.Hash) (map[string]interface{}, error)

GetTransactionReceipt returns the transaction receipt identified by hash.

func (*Backend) GetTxByEthHash 

func (b *Backend) GetTxByEthHash(hash common.Hash) (*ethermint.TxResult, error)

GetTxByEthHash uses `/tx_query` to find transaction by ethereum tx hash TODO: Don't need to convert once hashing is fixed on Tendermint https://github.com/tendermint/tendermint/issues/6539

func (*Backend) GetTxByTxIndex 

func (b *Backend) GetTxByTxIndex(height int64, index uint) (*ethermint.TxResult, error)

GetTxByTxIndex uses `/tx_query` to find transaction by tx index of valid ethereum txs

func (*Backend) GlobalMinGasPrice 

func (b *Backend) GlobalMinGasPrice() (sdk.Dec, error)

GlobalMinGasPrice returns MinGasPrice param from FeeMarket

func (*Backend) HeaderByHash 

func (b *Backend) HeaderByHash(blockHash common.Hash) (*ethtypes.Header, error)

HeaderByHash returns the block header identified by hash.

func (*Backend) HeaderByNumber 

func (b *Backend) HeaderByNumber(blockNum rpctypes.BlockNumber) (*ethtypes.Header, error)

HeaderByNumber returns the block header identified by height.

func (*Backend) ImportRawKey 

func (b *Backend) ImportRawKey(privkey, password string) (common.Address, error)

ImportRawKey armors and encrypts a given raw hex encoded ECDSA key and stores it into the key directory. The name of the key will have the format "personal_<length-keys>", where <length-keys> is the total number of keys stored on the keyring.

NOTE: The key will be both armored and encrypted using the same passphrase.

func (*Backend) ListAccounts 

func (b *Backend) ListAccounts() ([]common.Address, error)

ListAccounts will return a list of addresses for accounts this node manages.

func (*Backend) NewMnemonic 

func (b *Backend) NewMnemonic(uid string, language keyring.Language, hdPath, bip39Passphrase string, algo keyring.SignatureAlgo) (keyring.Info, error)

NewAccount will create a new account and returns the address for the new account.

func (*Backend) PendingTransactions 

func (b *Backend) PendingTransactions() ([]*sdk.Tx, error)

PendingTransactions returns the transactions that are in the transaction pool and have a from address that is one of the accounts this node manages.

func (*Backend) RPCBlockRangeCap 

func (b *Backend) RPCBlockRangeCap() int32

RPCBlockRangeCap defines the max block range allowed for `eth_getLogs` query.

func (*Backend) RPCEVMTimeout 

func (b *Backend) RPCEVMTimeout() time.Duration

RPCEVMTimeout is the global evm timeout for eth-call variants.

func (*Backend) RPCFeeHistoryCap 

func (b *Backend) RPCFeeHistoryCap() int32

RPCFeeHistoryCap is the limit for total number of blocks that can be fetched

func (*Backend) RPCFilterCap 

func (b *Backend) RPCFilterCap() int32

RPCFilterCap is the limit for total number of filters that can be created

func (*Backend) RPCGasCap 

func (b *Backend) RPCGasCap() uint64

RPCGasCap is the global gas cap for eth-call variants.

func (*Backend) RPCLogsCap 

func (b *Backend) RPCLogsCap() int32

RPCLogsCap defines the max number of results can be returned from single `eth_getLogs` query.

func (*Backend) RPCMinGasPrice 

func (b *Backend) RPCMinGasPrice() int64

func (*Backend) RPCTxFeeCap 

func (b *Backend) RPCTxFeeCap() float64

RPCGasCap is the global gas cap for eth-call variants.

func (*Backend) Resend 

func (b *Backend) Resend(args evmtypes.TransactionArgs, gasPrice *hexutil.Big, gasLimit *hexutil.Uint64) (common.Hash, error)

Resend accepts an existing transaction and a new gas price and limit. It will remove the given transaction from the pool and reinsert it with the new gas price and limit.

func (*Backend) SendRawTransaction 

func (b *Backend) SendRawTransaction(data hexutil.Bytes) (common.Hash, error)

SendRawTransaction send a raw Ethereum transaction.

func (*Backend) SendTransaction 

func (b *Backend) SendTransaction(args evmtypes.TransactionArgs) (common.Hash, error)

SendTransaction sends transaction based on received args using Node's key to sign it

func (*Backend) SetEtherbase 

func (b *Backend) SetEtherbase(etherbase common.Address) bool

SetEtherbase sets the etherbase of the miner

func (*Backend) SetGasPrice 

func (b *Backend) SetGasPrice(gasPrice hexutil.Big) bool

SetGasPrice sets the minimum accepted gas price for the miner. NOTE: this function accepts only integers to have the same interface than go-eth to use float values, the gas prices must be configured using the configuration file

func (*Backend) SetTxDefaults 

func (b *Backend) SetTxDefaults(args evmtypes.TransactionArgs) (evmtypes.TransactionArgs, error)

SetTxDefaults populates tx message with default values in case they are not provided on the args

func (*Backend) Sign 

func (b *Backend) Sign(address common.Address, data hexutil.Bytes) (hexutil.Bytes, error)

Sign signs the provided data using the private key of address via Geth's signature standard.

func (*Backend) SignTypedData 

func (b *Backend) SignTypedData(address common.Address, typedData apitypes.TypedData) (hexutil.Bytes, error)

SignTypedData signs EIP-712 conformant typed data

func (*Backend) SuggestGasTipCap 

func (b *Backend) SuggestGasTipCap(baseFee *big.Int) (*big.Int, error)

SuggestGasTipCap returns the suggested tip cap Although we don't support tx prioritization yet, but we return a positive value to help client to mitigate the base fee changes.

func (*Backend) Syncing 

func (b *Backend) Syncing() (interface{}, error)

Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not yet received the latest block headers from its pears. In case it is synchronizing: - startingBlock: block number this node started to synchronize from - currentBlock: block number this node is currently importing - highestBlock: block number of the highest block header this node has received from peers - pulledStates: number of state entries processed until now - knownStates: number of known state entries that still need to be pulled

func (*Backend) TraceBlock 

func (b *Backend) TraceBlock(height rpctypes.BlockNumber, config *evmtypes.TraceConfig, block *tmrpctypes.ResultBlock) ([]*evmtypes.TxTraceResult, error)

traceBlock configures a new tracer according to the provided configuration, and executes all the transactions contained within. The return value will be one item per transaction, dependent on the requested tracer.

func (*Backend) TraceTransaction 

func (b *Backend) TraceTransaction(hash common.Hash, config *evmtypes.TraceConfig) (interface{}, error)

TraceTransaction returns the structured logs created during the execution of EVM and returns them as a JSON object.

func (Backend) UnprotectedAllowed 

func (b Backend) UnprotectedAllowed() bool

UnprotectedAllowed returns the node configuration value for allowing unprotected transactions (i.e not replay-protected)

type BackendI 

type BackendI interface {
	CosmosBackend
	EVMBackend
}

BackendI implements the Cosmos and EVM backend.

type CosmosBackend 

type CosmosBackend interface {
}

CosmosBackend implements the functionality shared within cosmos namespaces as defined by Wallet Connect V2: https://docs.walletconnect.com/2.0/json-rpc/cosmos. Implemented by Backend.

type EVMBackend 

type EVMBackend interface {
	// Node specific queries
	Accounts() ([]common.Address, error)
	Syncing() (interface{}, error)
	SetEtherbase(etherbase common.Address) bool
	SetGasPrice(gasPrice hexutil.Big) bool
	ImportRawKey(privkey, password string) (common.Address, error)
	ListAccounts() ([]common.Address, error)
	NewMnemonic(uid string, language keyring.Language, hdPath, bip39Passphrase string, algo keyring.SignatureAlgo) (keyring.Info, error)
	UnprotectedAllowed() bool
	RPCGasCap() uint64            // global gas cap for eth_call over rpc: DoS protection
	RPCEVMTimeout() time.Duration // global timeout for eth_call over rpc: DoS protection
	RPCTxFeeCap() float64         // RPCTxFeeCap is the global transaction fee(price * gaslimit) cap for send-transaction variants. The unit is ether.
	RPCMinGasPrice() int64

	// Sign Tx
	Sign(address common.Address, data hexutil.Bytes) (hexutil.Bytes, error)
	SendTransaction(args evmtypes.TransactionArgs) (common.Hash, error)
	SignTypedData(address common.Address, typedData apitypes.TypedData) (hexutil.Bytes, error)

	// Blocks Info
	BlockNumber() (hexutil.Uint64, error)
	GetBlockByNumber(blockNum rpctypes.BlockNumber, fullTx bool) (map[string]interface{}, error)
	GetTendermintBlockByNumber(blockNum rpctypes.BlockNumber) (*tmrpctypes.ResultBlock, error)
	GetTendermintBlockResultByNumber(height *int64) (*tmrpctypes.ResultBlockResults, error)
	GetTendermintBlockByHash(blockHash common.Hash) (*tmrpctypes.ResultBlock, error)
	GetBlockByHash(hash common.Hash, fullTx bool) (map[string]interface{}, error)
	BlockByNumber(blockNum rpctypes.BlockNumber) (*ethtypes.Block, error)
	BlockByHash(blockHash common.Hash) (*ethtypes.Block, error)
	GetBlockNumberByHash(blockHash common.Hash) (*big.Int, error)
	GetBlockNumber(blockNrOrHash rpctypes.BlockNumberOrHash) (rpctypes.BlockNumber, error)
	GetBlockTransactionCountByHash(hash common.Hash) *hexutil.Uint
	GetBlockTransactionCountByNumber(blockNum rpctypes.BlockNumber) *hexutil.Uint
	BlockBloom(blockRes *tmrpctypes.ResultBlockResults) (ethtypes.Bloom, error)
	GetEthereumMsgsFromTendermintBlock(block *tmrpctypes.ResultBlock, blockRes *tmrpctypes.ResultBlockResults) []*evmtypes.MsgEthereumTx
	HeaderByNumber(blockNum rpctypes.BlockNumber) (*ethtypes.Header, error)
	HeaderByHash(blockHash common.Hash) (*ethtypes.Header, error)
	EthBlockFromTendermint(resBlock *tmrpctypes.ResultBlock, blockRes *tmrpctypes.ResultBlockResults, fullTx bool) (map[string]interface{}, error)
	EthBlockFromTm(resBlock *tmrpctypes.ResultBlock, blockRes *tmrpctypes.ResultBlockResults) (*ethtypes.Block, error)

	// Account Info
	GetCode(address common.Address, blockNrOrHash rpctypes.BlockNumberOrHash) (hexutil.Bytes, error)
	GetBalance(address common.Address, blockNrOrHash rpctypes.BlockNumberOrHash) (*hexutil.Big, error)
	GetStorageAt(address common.Address, key string, blockNrOrHash rpctypes.BlockNumberOrHash) (hexutil.Bytes, error)
	GetProof(address common.Address, storageKeys []string, blockNrOrHash rpctypes.BlockNumberOrHash) (*rpctypes.AccountResult, error)
	GetTransactionCount(address common.Address, blockNum rpctypes.BlockNumber) (*hexutil.Uint64, error)

	// Chain Info
	ChainID() (*hexutil.Big, error)
	ChainConfig() *params.ChainConfig
	GlobalMinGasPrice() (sdk.Dec, error)
	BaseFee(blockRes *tmrpctypes.ResultBlockResults) (*big.Int, error)
	CurrentHeader() *ethtypes.Header
	PendingTransactions() ([]*sdk.Tx, error)
	GetCoinbase() (sdk.AccAddress, error)
	FeeHistory(blockCount rpc.DecimalOrHex, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*rpctypes.FeeHistoryResult, error)
	SuggestGasTipCap(baseFee *big.Int) (*big.Int, error)

	// Tx Info
	GetTransactionByHash(txHash common.Hash) (*rpctypes.RPCTransaction, error)
	GetTxByEthHash(txHash common.Hash) (*ethermint.TxResult, error)
	GetTxByTxIndex(height int64, txIndex uint) (*ethermint.TxResult, error)
	GetTransactionByBlockAndIndex(block *tmrpctypes.ResultBlock, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)
	GetTransactionReceipt(hash common.Hash) (map[string]interface{}, error)
	GetTransactionByBlockHashAndIndex(hash common.Hash, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)
	GetTransactionByBlockNumberAndIndex(blockNum rpctypes.BlockNumber, idx hexutil.Uint) (*rpctypes.RPCTransaction, error)

	// Send Transaction
	Resend(args evmtypes.TransactionArgs, gasPrice *hexutil.Big, gasLimit *hexutil.Uint64) (common.Hash, error)
	SendRawTransaction(data hexutil.Bytes) (common.Hash, error)
	SetTxDefaults(args evmtypes.TransactionArgs) (evmtypes.TransactionArgs, error)
	EstimateGas(args evmtypes.TransactionArgs, blockNrOptional *rpctypes.BlockNumber) (hexutil.Uint64, error)
	DoCall(args evmtypes.TransactionArgs, blockNr rpctypes.BlockNumber) (*evmtypes.MsgEthereumTxResponse, error)

	// Filter API
	GetLogs(hash common.Hash) ([][]*ethtypes.Log, error)
	GetLogsByHeight(height *int64) ([][]*ethtypes.Log, error)
	BloomStatus() (uint64, uint64)

	// Tracing
	TraceTransaction(hash common.Hash, config *evmtypes.TraceConfig) (interface{}, error)
	TraceBlock(height rpctypes.BlockNumber, config *evmtypes.TraceConfig, block *tmrpctypes.ResultBlock) ([]*evmtypes.TxTraceResult, error)
}

EVMBackend implements the functionality shared within ethereum namespaces as defined by EIP-1474: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1474.md Implemented by Backend.

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