Ethereum module wrapping the public and private key cryptography and ledger api.

def get_gas_price_strategy(
        gas_price_strategy: Optional[str] = None,
        api_key: Optional[str] = None) -> Callable[[Web3, TxParams], Wei]

Get the gas price strategy.

class SignedTransactionTranslator()

Translator for SignedTransaction.

@staticmethod
def to_dict(
        signed_transaction: SignedTransaction) -> Dict[str, Union[str, int]]

Write SignedTransaction to dict.

@staticmethod
def from_dict(signed_transaction_dict: JSONLike) -> SignedTransaction

Get SignedTransaction from dict.

class AttributeDictTranslator()

Translator for AttributeDict.

@classmethod
def to_dict(cls, attr_dict: Union[AttributeDict, TxReceipt,
                                  TxData]) -> JSONLike

Simplify to dict.

@classmethod
def from_dict(cls, di: JSONLike) -> AttributeDict

Get back attribute dict.

class EthereumCrypto(Crypto[Account])

Class wrapping the Account Generation from Ethereum ledger.

def __init__(private_key_path: Optional[str] = None,
             password: Optional[str] = None) -> None

Instantiate an ethereum crypto object.

Arguments:

• private_key_path: the private key path of the agent
• password: the password to encrypt/decrypt the private key.

@property
def private_key() -> str

Return a private key.

Returns:

a private key string

@property
def public_key() -> str

Return a public key in hex format.

Returns:

a public key string in hex format

@property
def address() -> str

Return the address for the key pair.

Returns:

a display_address str

@classmethod
def load_private_key_from_path(cls,
                               file_name: str,
                               password: Optional[str] = None) -> Account

Load a private key in hex format from a file.

Arguments:

• file_name: the path to the hex file.
• password: the password to encrypt/decrypt the private key.

Returns:

the Entity.

def sign_message(message: bytes, is_deprecated_mode: bool = False) -> str

Sign a message in bytes string form.

Arguments:

• message: the message to be signed
• is_deprecated_mode: if the deprecated signing is used

Returns:

signature of the message in string form

def sign_transaction(transaction: JSONLike) -> JSONLike

Sign a transaction in bytes string form.

Arguments:

• transaction: the transaction to be signed

Returns:

signed transaction

@classmethod
def generate_private_key(cls) -> Account

Generate a key pair for ethereum network.

def encrypt(password: str) -> str

Encrypt the private key and return in json.

Arguments:

• password: the password to decrypt.

Returns:

json string containing encrypted private key.

@classmethod
def decrypt(cls, keyfile_json: str, password: str) -> str

Decrypt the private key and return in raw form.

Arguments:

• keyfile_json: json str containing encrypted private key.
• password: the password to decrypt.

Returns:

the raw private key.

class EthereumHelper(Helper)

Helper class usable as Mixin for EthereumApi or as standalone class.

@staticmethod
def is_transaction_settled(tx_receipt: JSONLike) -> bool

Check whether a transaction is settled or not.

Arguments:

• tx_receipt: the receipt associated to the transaction.

Returns:

True if the transaction has been settled, False o/w.

@staticmethod
def get_contract_address(tx_receipt: JSONLike) -> Optional[str]

Retrieve the contract_address from a transaction receipt.

Arguments:

• tx_receipt: the receipt of the transaction.

Returns:

the contract address, if present

@staticmethod
def is_transaction_valid(tx: dict, seller: Address, client: Address,
                         tx_nonce: str, amount: int) -> bool

Check whether a transaction is valid or not.

Arguments:

• tx: the transaction.
• seller: the address of the seller.
• client: the address of the client.
• tx_nonce: the transaction nonce.
• amount: the amount we expect to get from the transaction.

Returns:

True if the random_message is equals to tx['input']

@staticmethod
def generate_tx_nonce(seller: Address, client: Address) -> str

Generate a unique hash to distinguish transactions with the same terms.

Arguments:

• seller: the address of the seller.
• client: the address of the client.

Returns:

return the hash in hex.

@classmethod
def get_address_from_public_key(cls, public_key: str) -> str

Get the address from the public key.

Arguments:

• public_key: the public key

Returns:

str

@classmethod
def recover_message(cls,
                    message: bytes,
                    signature: str,
                    is_deprecated_mode: bool = False) -> Tuple[Address, ...]

Recover the addresses from the hash.

Arguments:

• message: the message we expect
• signature: the transaction signature
• is_deprecated_mode: if the deprecated signing was used

Returns:

the recovered addresses

@classmethod
def recover_public_keys_from_message(
        cls,
        message: bytes,
        signature: str,
        is_deprecated_mode: bool = False) -> Tuple[str, ...]

Get the public key used to produce the signature of the message

Arguments:

• message: raw bytes used to produce signature
• signature: signature of the message
• is_deprecated_mode: if the deprecated signing was used

Returns:

the recovered public keys

@staticmethod
def get_hash(message: bytes) -> str

Get the hash of a message.

Arguments:

• message: the message to be hashed.

Returns:

the hash of the message.

@classmethod
def load_contract_interface(cls, file_path: Path) -> Dict[str, str]

Load contract interface.

Arguments:

• file_path: the file path to the interface

Returns:

the interface

class EthereumApi(LedgerApi, EthereumHelper)

Class to interact with the Ethereum Web3 APIs.

def __init__(**kwargs: Any)

Initialize the Ethereum ledger APIs.

Arguments:

• kwargs: keyword arguments

@property
def api() -> Web3

Get the underlying API object.

def get_balance(address: Address) -> Optional[int]

Get the balance of a given account.

def get_state(callable_name: str, *args: Any,
              **kwargs: Any) -> Optional[JSONLike]

Call a specified function on the ledger API.

def get_transfer_transaction(sender_address: Address,
                             destination_address: Address,
                             amount: int,
                             tx_fee: int,
                             tx_nonce: str,
                             chain_id: Optional[int] = None,
                             gas_price: Optional[str] = None,
                             gas_price_strategy: Optional[str] = None,
                             **kwargs: Any) -> Optional[JSONLike]

Submit a transfer transaction to the ledger.

Arguments:

• sender_address: the sender address of the payer.
• destination_address: the destination address of the payee.
• amount: the amount of wealth to be transferred (in Wei).
• tx_fee: the transaction fee (gas) to be used (in Wei).
• tx_nonce: verifies the authenticity of the tx.
• chain_id: the Chain ID of the Ethereum transaction.
• gas_price: the gas price (in Wei)
• gas_price_strategy: the gas price strategy to be used.
• kwargs: keyword arguments

Returns:

the transfer transaction

def update_with_gas_estimate(transaction: JSONLike) -> JSONLike

Attempts to update the transaction with a gas estimate

Arguments:

• transaction: the transaction

Returns:

the updated transaction

def send_signed_transaction(tx_signed: JSONLike) -> Optional[str]

Send a signed transaction and wait for confirmation.

Arguments:

• tx_signed: the signed transaction

Returns:

tx_digest, if present

def get_transaction_receipt(tx_digest: str) -> Optional[JSONLike]

Get the transaction receipt for a transaction digest.

Arguments:

• tx_digest: the digest associated to the transaction.

Returns:

the tx receipt, if present

def get_transaction(tx_digest: str) -> Optional[JSONLike]

Get the transaction for a transaction digest.

Arguments:

• tx_digest: the digest associated to the transaction.

Returns:

the tx, if present

def get_contract_instance(contract_interface: Dict[str, str],
                          contract_address: Optional[str] = None) -> Any

Get the instance of a contract.

Arguments:

• contract_interface: the contract interface.
• contract_address: the contract address.

Returns:

the contract instance

def get_deploy_transaction(contract_interface: Dict[str, str],
                           deployer_address: Address,
                           value: int = 0,
                           gas: int = 0,
                           gas_price: Optional[str] = None,
                           gas_price_strategy: Optional[str] = None,
                           **kwargs: Any) -> Optional[JSONLike]

Get the transaction to deploy the smart contract.

Arguments:

• contract_interface: the contract interface.
• deployer_address: The address that will deploy the contract.
• value: value to send to contract (in Wei)
• gas: the gas to be used (in Wei)
• gas_price: the gas price (in Wei)
• gas_price_strategy: the gas price strategy to be used.
• kwargs: keyword arguments

Returns:

the transaction dictionary.

@classmethod
def is_valid_address(cls, address: Address) -> bool

Check if the address is valid.

Arguments:

• address: the address to validate

Returns:

whether the address is valid

class EthereumFaucetApi(FaucetApi)

Ethereum testnet faucet API.

def get_wealth(address: Address, url: Optional[str] = None) -> None

Get wealth from the faucet for the provided address.

Arguments:

• address: the address.
• url: the url

class LruLockWrapper()

Wrapper for LRU with threading.Lock.

def __init__(lru: LRU) -> None

Init wrapper.

def __getitem__(*args: Any, **kwargs: Any) -> Any

Get item

def __setitem__(*args: Any, **kwargs: Any) -> Any

Set item.

def __contains__(*args: Any, **kwargs: Any) -> Any

Contain item.

def __delitem__(*args: Any, **kwargs: Any) -> Any

Del item.

def set_wrapper_for_web3py_session_cache() -> None

Wrap web3py session cache with threading.Lock.