Skip to content

aea.crypto.ethereum

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

SignedTransactionTranslator Objects

class SignedTransactionTranslator()

Translator for SignedTransaction.

to_dict

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

Write SignedTransaction to dict.

from_dict

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

Get SignedTransaction from dict.

AttributeDictTranslator Objects

class AttributeDictTranslator()

Translator for AttributeDict.

to_dict

 | @classmethod
 | to_dict(cls, attr_dict: AttributeDict) -> JSONLike

Simplify to dict.

from_dict

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

Get back attribute dict.

EthereumCrypto Objects

class EthereumCrypto(Crypto[Account])

Class wrapping the Account Generation from Ethereum ledger.

__init__

 | __init__(private_key_path: Optional[str] = None)

Instantiate an ethereum crypto object.

Arguments:

  • private_key_path: the private key path of the agent

private_key

 | @property
 | private_key() -> str

Return a private key.

Returns:

a private key string

public_key

 | @property
 | public_key() -> str

Return a public key in hex format.

Returns:

a public key string in hex format

address

 | @property
 | address() -> str

Return the address for the key pair.

Returns:

a display_address str

load_private_key_from_path

 | @classmethod
 | load_private_key_from_path(cls, file_name) -> Account

Load a private key in hex format from a file.

Arguments:

  • file_name: the path to the hex file.

Returns:

the Entity.

sign_message

 | 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

sign_transaction

 | sign_transaction(transaction: JSONLike) -> JSONLike

Sign a transaction in bytes string form.

Arguments:

  • transaction: the transaction to be signed

Returns:

signed transaction

generate_private_key

 | @classmethod
 | generate_private_key(cls) -> Account

Generate a key pair for ethereum network.

dump

 | dump(fp: BinaryIO) -> None

Serialize crypto object as binary stream to fp (a .write()-supporting file-like object).

Arguments:

  • fp: the output file pointer. Must be set in binary mode (mode='wb')

Returns:

None

EthereumHelper Objects

class EthereumHelper(Helper)

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

is_transaction_settled

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

Check whether a transaction is settled or not.

Arguments:

  • tx_digest: the digest associated to the transaction.

Returns:

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

is_transaction_valid

 | @staticmethod
 | 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']

generate_tx_nonce

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

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

Arguments:

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

Returns:

return the hash in hex.

get_address_from_public_key

 | @classmethod
 | 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

recover_message

 | @classmethod
 | 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

recover_public_keys_from_message

 | @classmethod
 | 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

get_hash

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

Get the hash of a message.

Arguments:

  • message: the message to be hashed.

Returns:

the hash of the message.

load_contract_interface

 | @classmethod
 | 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

EthereumApi Objects

class EthereumApi(LedgerApi,  EthereumHelper)

Class to interact with the Ethereum Web3 APIs.

__init__

 | __init__(**kwargs)

Initialize the Ethereum ledger APIs.

Arguments:

  • address: the endpoint for Web3 APIs.

api

 | @property
 | api() -> Web3

Get the underlying API object.

get_balance

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

Get the balance of a given account.

get_state

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

Call a specified function on the ledger API.

get_transfer_transaction

 | 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, **kwargs, ,) -> 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.
  • tx_fee: the transaction fee.
  • tx_nonce: verifies the authenticity of the tx
  • chain_id: the Chain ID of the Ethereum transaction. Default is 3 (i.e. ropsten; mainnet has 1).
  • gas_price: the gas price

Returns:

the transfer transaction

update_with_gas_estimate

 | update_with_gas_estimate(transaction: JSONLike) -> JSONLike

Attempts to update the transaction with a gas estimate

Arguments:

  • transaction: the transaction

Returns:

the updated transaction

send_signed_transaction

 | 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

get_transaction_receipt

 | 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

get_transaction

 | 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

get_contract_instance

 | 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

get_deploy_transaction

 | get_deploy_transaction(contract_interface: Dict[str, str], deployer_address: Address, value: int = 0, gas: int = 0, **kwargs, ,) -> 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 (ETH in Wei)
  • gas: the gas to be used :returns tx: the transaction dictionary.

is_valid_address

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

Check if the address is valid.

Arguments:

  • address: the address to validate

EthereumFaucetApi Objects

class EthereumFaucetApi(FaucetApi)

Ethereum testnet faucet API.

get_wealth

 | 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

Returns:

None