def from_dict(cls: Type[Transaction], value: Dict[str,
Any]) -> Transaction:
"""
Construct a new Transaction from a dictionary of parameters.
Args:
value: The value to construct the Transaction from.
Returns:
A new Transaction object, constructed using the given parameters.
Raises:
XRPLModelException: If the dictionary provided is invalid.
"""
if cls.__name__ == "Transaction":
# using `Transaction.from_dict` and not a subclass
if "transaction_type" not in value:
raise XRPLModelException(
"Transaction does not include transaction_type.")
correct_type = cls.get_transaction_type(value["transaction_type"])
return correct_type.from_dict(value)
else:
if "transaction_type" in value:
if value["transaction_type"] != cls.__name__:
transaction_type = value["transaction_type"]
raise XRPLModelException(
f"Using wrong constructor: using f{cls.__name__} constructor "
f"with transaction type f{transaction_type}.")
value = {**value}
del value["transaction_type"]
return cast(Transaction, super(Transaction, cls).from_dict(value))
def from_dict(cls: Type[Request], value: Dict[str, Any]) -> Request:
"""
Construct a new Request from a dictionary of parameters.
Args:
value: The value to construct the Request from.
Returns:
A new Request object, constructed using the given parameters.
Raises:
XRPLModelException: If the dictionary provided is invalid.
"""
if cls.__name__ == "Request":
if "method" not in value:
raise XRPLModelException("Request does not include method.")
correct_type = cls.get_method(value["method"])
return correct_type.from_dict(value)
if "method" in value:
method = value["method"]
if _method_to_class_name(method) != cls.__name__ and not (
method == "submit"
and cls.__name__ in ("SignAndSubmit", "SubmitOnly")):
raise XRPLModelException(
f"Using wrong constructor: using {cls.__name__} constructor "
f"with Request method {method}.")
value = {**value}
del value["method"]
return cast(Request, super(Request, cls).from_dict(value))
def _from_dict_special_cases(
cls: Type[BaseModel],
param: str,
param_type: Type[Any],
param_value: Dict[str, Any],
) -> Union[str, Enum, BaseModel, Dict[str, Any]]:
"""Handles all the recursive/more complex cases for `from_dict`."""
from xrpl.models.amounts import Amount, IssuedCurrencyAmount
from xrpl.models.currencies import XRP, Currency, IssuedCurrency
from xrpl.models.transactions.transaction import Transaction
# TODO: figure out how to make Unions work generically (if possible)
if param_type == Amount:
# special case, Union
if isinstance(param_value, str):
return param_value
if not isinstance(param_value, dict):
raise XRPLModelException(
f"{param_type} requires a dictionary of params")
return IssuedCurrencyAmount.from_dict(param_value)
if param_type == Currency:
# special case, Union
if not isinstance(param_value, dict):
raise XRPLModelException(
f"{param_type} requires a dictionary of params")
if "currency" in param_value and "issuer" in param_value:
return IssuedCurrency.from_dict(param_value)
if "currency" in param_value:
param_value_copy = {**param_value}
del param_value_copy["currency"]
return XRP.from_dict(param_value_copy)
raise XRPLModelException(f"No valid type for {param}")
if param_type == Transaction:
# special case, multiple options (could be any Transaction type)
if "transaction_type" not in param_value:
raise XRPLModelException(
f"{param} not a valid parameter for {cls.__name__}")
type_str = param_value["transaction_type"]
# safely convert type string into the actual type
transaction_type = Transaction.get_transaction_type(type_str)
param_value_copy = {**param_value}
del param_value_copy["transaction_type"]
return transaction_type.from_dict(param_value_copy)
if param_type in BaseModel.__subclasses__():
# any other BaseModel
if not isinstance(param_value, dict):
raise XRPLModelException(
f"{param_type} requires a dictionary of params")
# mypy doesn't know that the If checks that it's a subclass of BaseModel
return param_type.from_dict(param_value) # type: ignore
if param_type in Enum.__subclasses__():
# mypy doesn't know that the If checks that it's a subclass of Enum
return param_type(param_value) # type: ignore
return param_value
def _from_dict_single_param(
cls: Type[BaseModel],
param: str,
param_type: Type[Any],
param_value: Dict[str, Any],
) -> Any:
"""Recursively handles each individual param in `from_dict`."""
if type(param_value) == param_type:
# the type of the param provided matches the type expected for the param
return param_value
if "xrpl.models" in param_type.__module__: # any model defined in xrpl.models
if not isinstance(param_value, dict):
raise XRPLModelException(
f"{param_type} requires a dictionary of params")
return cast(BaseModel, param_type).from_dict(param_value)
if param_type in Enum.__subclasses__(): # an Enum
return param_type(param_value)
# param_type must be something from typing - e.g. List, Union, Any
# there are no models that have Dict params
if param_type == Any:
# param_type is Any
return param_value
if param_type.__reduce__()[1][0] == List:
# param_type is a List
if not isinstance(param_value, List):
raise XRPLModelException(
f"{param} expected a List, received a {type(param_value)}")
list_type = param_type.__reduce__()[1][1]
new_list = []
for item in param_value:
new_list.append(
cls._from_dict_single_param(param, list_type, item))
return new_list
if param_type.__reduce__()[1][0] == Union:
# param_type is a Union
for param_type_option in param_type.__args__:
# iterate through the types Union-ed together
try:
# try to use this Union-ed type to process param_value
return cls._from_dict_single_param(param,
param_type_option,
param_value)
except XRPLModelException:
# this Union-ed type did not work
# move onto the next one
continue
raise XRPLModelException(
f"{param} expected a {param_type}, received a {type(param_value)}")
def from_dict(cls: Type[BaseModel], value: Dict[str, Any]) -> BaseModel:
"""
Construct a new BaseModel from a dictionary of parameters.
Args:
value: The value to construct the BaseModel from.
Returns:
A new BaseModel object, constructed using the given parameters.
Raises:
XRPLModelException: If the dictionary provided is invalid.
"""
# returns a dictionary mapping class params to their types
class_types = get_type_hints(cls)
args = {}
for param in value:
if param not in class_types:
raise XRPLModelException(
f"{param} not a valid parameter for {cls.__name__}"
)
args[param] = cls._from_dict_single_param(
param, class_types[param], value[param]
)
init = cls._get_only_init_args(args)
# Ignore type-checking on this for now to simplify subclass constructors
# which might pass non kwargs.
return cls(**init) # type: ignore
def get_transaction_type(cls: Type[Transaction],
transaction_type: str) -> Type[Transaction]:
"""
Returns the correct transaction type based on the string name.
Args:
transaction_type: The String name of the Transaction object.
Returns:
The transaction class with the given name.
Raises:
XRPLModelException: If `transaction_type` is not a valid Transaction type.
"""
import xrpl.models.transactions as transaction_models
transaction_types: Dict[str, Type[Transaction]] = {
t.value: getattr(transaction_models, t)
for t in transaction_models.transaction.TransactionType
}
if transaction_type in transaction_types:
return transaction_types[transaction_type]
raise XRPLModelException(
f"{transaction_type} is not a valid Transaction type")
def new_init(self: _Self, *args: List[Any], **kwargs: Dict[str,
Any]) -> None:
if len(args) > 0:
raise XRPLModelException(
f"{type(self).__name__}.__init__ only allows keyword arguments. "
f"Found the following positional arguments: {args}")
original_init(self, **kwargs) # type: ignore
def validate(self: BaseModel) -> None:
"""
Raises if this object is invalid.
Raises:
XRPLModelException: if this object is invalid.
"""
errors = self._get_errors()
if len(errors) > 0:
raise XRPLModelException(str(errors))
def get_hash(self: Transaction) -> str:
"""
Hashes the Transaction object as the ledger does. Only valid for signed
Transaction objects.
Returns:
The hash of the Transaction object.
Raises:
XRPLModelException: if the Transaction is unsigned.
"""
if self.txn_signature is None:
raise XRPLModelException(
"Cannot get the hash from an unsigned Transaction.")
prefix = hex(_TRANSACTION_HASH_PREFIX)[2:].upper()
encoded_str = bytes.fromhex(prefix + encode(self.to_xrpl()))
return sha512(encoded_str).digest().hex().upper()[:64]
def from_dict(cls: Type[XRP], value: Dict[str, Any]) -> XRP:
"""
Construct a new XRP from a dictionary of parameters.
Args:
value: The value to construct the XRP from.
Returns:
A new XRP object, constructed using the given parameters.
Raises:
XRPLModelException: If the dictionary provided is invalid.
"""
if len(value
) != 1 or "currency" not in value or value["currency"] != "XRP":
raise XRPLModelException("Not a valid XRP type")
return XRP()
def get_method(cls: Type[Request], method: str) -> Type[Request]:
"""
Returns the correct request method based on the string name.
Args:
method: The String name of the Request object.
Returns:
The request class with the given name.
Raises:
XRPLModelException: If `method` is not a valid Request method.
"""
import xrpl.models.requests as request_models
request_methods: Dict[str, Type[Request]] = {}
for r in RequestMethod:
method_name = _method_to_class_name(r.name)
request_methods[r.value] = getattr(request_models, method_name)
if method in request_methods:
return request_methods[method]
raise XRPLModelException(f"{method} is not a valid Request method")
def get_transaction_type(cls: Type[Transaction],
transaction_type: str) -> Type[Transaction]:
"""
Returns the correct transaction type based on the string name.
Args:
transaction_type: The String name of the Transaction object.
Returns:
The transaction class with the given name.
Raises:
XRPLModelException: If `transaction_type` is not a valid Transaction type.
"""
if transaction_type == TransactionType.ACCOUNT_DELETE:
from xrpl.models.transactions import AccountDelete
return AccountDelete
if transaction_type == TransactionType.ACCOUNT_SET:
from xrpl.models.transactions import AccountSet
return AccountSet
if transaction_type == TransactionType.CHECK_CANCEL:
from xrpl.models.transactions import CheckCancel
return CheckCancel
if transaction_type == TransactionType.CHECK_CASH:
from xrpl.models.transactions import CheckCash
return CheckCash
if transaction_type == TransactionType.CHECK_CREATE:
from xrpl.models.transactions import CheckCreate
return CheckCreate
if transaction_type == TransactionType.DEPOSIT_PREAUTH:
from xrpl.models.transactions import DepositPreauth
return DepositPreauth
if transaction_type == TransactionType.ESCROW_CANCEL:
from xrpl.models.transactions import EscrowCancel
return EscrowCancel
if transaction_type == TransactionType.ESCROW_CREATE:
from xrpl.models.transactions import EscrowCreate
return EscrowCreate
if transaction_type == TransactionType.ESCROW_FINISH:
from xrpl.models.transactions import EscrowFinish
return EscrowFinish
if transaction_type == TransactionType.OFFER_CANCEL:
from xrpl.models.transactions import OfferCancel
return OfferCancel
if transaction_type == TransactionType.OFFER_CREATE:
from xrpl.models.transactions import OfferCreate
return OfferCreate
if transaction_type == TransactionType.PAYMENT:
from xrpl.models.transactions import Payment
return Payment
if transaction_type == TransactionType.PAYMENT_CHANNEL_CLAIM:
from xrpl.models.transactions import PaymentChannelClaim
return PaymentChannelClaim
if transaction_type == TransactionType.PAYMENT_CHANNEL_CREATE:
from xrpl.models.transactions import PaymentChannelCreate
return PaymentChannelCreate
if transaction_type == TransactionType.PAYMENT_CHANNEL_FUND:
from xrpl.models.transactions import PaymentChannelFund
return PaymentChannelFund
if transaction_type == TransactionType.SET_REGULAR_KEY:
from xrpl.models.transactions import SetRegularKey
return SetRegularKey
if transaction_type == TransactionType.SIGNER_LIST_SET:
from xrpl.models.transactions import SignerListSet
return SignerListSet
if transaction_type == TransactionType.TRUST_SET:
from xrpl.models.transactions import TrustSet
return TrustSet
raise XRPLModelException(
f"{transaction_type} is not a valid Transaction type")
def _from_dict_single_param(
cls: Type[BaseModel],
param: str,
param_type: Type[Any],
param_value: Union[int, str, bool, BaseModel, Enum, List[Any],
Dict[str, Any]],
) -> Any:
"""Recursively handles each individual param in `from_dict`."""
param_type_origin = get_origin(param_type)
# returns `list` if a List, `Union` if a Union, None otherwise
if param_type_origin is list and isinstance(param_value, list):
# expected a List, received a List
list_type = get_args(param_type)[0]
return [
cls._from_dict_single_param(param, list_type, item)
for item in param_value
]
if param_type_origin is Union:
for param_type_option in get_args(param_type):
# iterate through the types Union-ed together
try:
# try to use this Union-ed type to process param_value
return cls._from_dict_single_param(param,
param_type_option,
param_value)
except XRPLModelException:
# this Union-ed type did not work, move onto the next one
pass
# no more collections (no params expect a Dict)
if param_type is Any:
# param_type is Any (e.g. will accept anything)
return param_value
if isinstance(param_type, type) and isinstance(param_value,
param_type):
# expected an object, received the correct object
return param_value
if (isinstance(param_type, type) and issubclass(param_type, Enum)
and param_value in list(param_type)):
# expected an Enum and received a valid value for it.
# for some reason required for string enums.
return param_value
if (isinstance(param_type, type) and issubclass(param_type, BaseModel)
and isinstance(param_value, dict)):
# expected an XRPL Model, received a Dict
return cast(BaseModel, param_type).from_dict(param_value)
# received something we didn't expect, raise an error
if isinstance(param_type, type) and issubclass(param_type, BaseModel):
error_message = (
f"{param} expected a {param_type} or a Dict representing {param_type}, "
f"received a {type(param_value)}")
else:
error_message = (
f"{param} expected a {param_type}, received a {type(param_value)}"
)
raise XRPLModelException(error_message)
