aea.crypto.ledger_apis

Module wrapping all the public and private keys cryptography.

LedgerApis Objects

class LedgerApis()

Store all the ledger apis we initialise.

has_ledger

 | @staticmethod
 | has_ledger(identifier: str) -> bool

Check if it has the api.

get_api

 | @classmethod
 | get_api(cls, identifier: str) -> LedgerApi

Get the ledger API.

get_balance

 | @classmethod
 | get_balance(cls, identifier: str, address: str) -> Optional[int]

Get the token balance.

Arguments:

• identifier: the identifier of the ledger
• address: the address to check for

Returns:

the token balance

get_transfer_transaction

 | @classmethod
 | get_transfer_transaction(cls, identifier: str, sender_address: str, destination_address: str, amount: int, tx_fee: int, tx_nonce: str, **kwargs: Any, ,) -> Optional[Any]

Get a transaction to transfer from self to destination.

Arguments:

• identifier: the identifier of the ledger
• sender_address: the address of the sender
• destination_address: the address of the receiver
• amount: the amount
• tx_nonce: verifies the authenticity of the tx
• tx_fee: the tx fee
• kwargs: the keyword arguments.

Returns:

tx

send_signed_transaction

 | @classmethod
 | send_signed_transaction(cls, identifier: str, tx_signed: Any) -> Optional[str]

Send a signed transaction and wait for confirmation.

Arguments:

• identifier: the identifier of the ledger
• tx_signed: the signed transaction

Returns:

the tx_digest, if present

get_transaction_receipt

 | @classmethod
 | get_transaction_receipt(cls, identifier: str, tx_digest: str) -> Optional[Any]

Get the transaction receipt for a transaction digest.

Arguments:

• identifier: the identifier of the ledger
• tx_digest: the digest associated to the transaction.

Returns:

the tx receipt, if present

get_transaction

 | @classmethod
 | get_transaction(cls, identifier: str, tx_digest: str) -> Optional[Any]

Get the transaction for a transaction digest.

Arguments:

• identifier: the identifier of the ledger
• tx_digest: the digest associated to the transaction.

Returns:

the tx, if present

get_contract_address

 | @staticmethod
 | get_contract_address(identifier: str, tx_receipt: Any) -> Optional[Address]

Get the contract address from a transaction receipt.

Arguments:

• identifier: the identifier of the ledger
• tx_receipt: the transaction receipt

Returns:

the contract address if successful

is_transaction_settled

 | @staticmethod
 | is_transaction_settled(identifier: str, tx_receipt: Any) -> bool

Check whether the transaction is settled and correct.

Arguments:

• identifier: the identifier of the ledger
• tx_receipt: the transaction digest

Returns:

True if correctly settled, False otherwise

is_transaction_valid

 | @staticmethod
 | is_transaction_valid(identifier: str, tx: Any, seller: Address, client: Address, tx_nonce: str, amount: int) -> bool

Check whether the transaction is valid.

Arguments:

• identifier: Ledger identifier
• 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 is valid , False otherwise

generate_tx_nonce

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

Generate a random str message.

Arguments:

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

Returns:

return the hash in hex.

recover_message

 | @staticmethod
 | recover_message(identifier: str, message: bytes, signature: str, is_deprecated_mode: bool = False) -> Tuple[Address, ...]

Recover the addresses from the hash.

Arguments:

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

Returns:

the recovered addresses

get_hash

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

Get the hash of a message.

Arguments:

• identifier: ledger identifier.
• message: the message to be hashed.

Returns:

the hash of the message.

is_valid_address

 | @staticmethod
 | is_valid_address(identifier: str, address: Address) -> bool

Check if the address is valid.

Arguments:

• identifier: ledger identifier.
• address: the address to validate.

Returns:

whether it is a valid address or not.