76 lines
2.7 KiB
Python
76 lines
2.7 KiB
Python
# Copyright © 2020 Interplanetary Database Association e.V.,
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# BigchainDB and IPDB software contributors.
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# SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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# Code is Apache-2.0 and docs are CC-BY-4.0
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from bigchaindb.backend.schema import validate_language_key
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from bigchaindb.common.exceptions import (InvalidSignature,
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DuplicateTransaction)
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from bigchaindb.common.schema import validate_transaction_schema
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from bigchaindb.common.transaction import Transaction
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from bigchaindb.common.utils import (validate_txn_obj, validate_key)
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class Transaction(Transaction):
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ASSET = 'asset'
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METADATA = 'metadata'
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DATA = 'data'
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def validate(self, bigchain, current_transactions=[]):
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"""Validate transaction spend
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Args:
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bigchain (BigchainDB): an instantiated bigchaindb.BigchainDB object.
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Returns:
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The transaction (Transaction) if the transaction is valid else it
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raises an exception describing the reason why the transaction is
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invalid.
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Raises:
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ValidationError: If the transaction is invalid
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"""
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input_conditions = []
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if self.operation == Transaction.CREATE:
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duplicates = any(txn for txn in current_transactions if txn.id == self.id)
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if bigchain.is_committed(self.id) or duplicates:
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raise DuplicateTransaction('transaction `{}` already exists'
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.format(self.id))
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if not self.inputs_valid(input_conditions):
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raise InvalidSignature('Transaction signature is invalid.')
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elif self.operation == Transaction.TRANSFER:
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self.validate_transfer_inputs(bigchain, current_transactions)
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return self
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@classmethod
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def from_dict(cls, tx_body):
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return super().from_dict(tx_body, False)
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@classmethod
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def validate_schema(cls, tx_body):
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validate_transaction_schema(tx_body)
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validate_txn_obj(cls.ASSET, tx_body[cls.ASSET], cls.DATA, validate_key)
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validate_txn_obj(cls.METADATA, tx_body, cls.METADATA, validate_key)
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validate_language_key(tx_body[cls.ASSET], cls.DATA)
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validate_language_key(tx_body, cls.METADATA)
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class FastTransaction:
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"""A minimal wrapper around a transaction dictionary. This is useful for
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when validation is not required but a routine expects something that looks
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like a transaction, for example during block creation.
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Note: immutability could also be provided
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"""
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def __init__(self, tx_dict):
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self.data = tx_dict
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@property
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def id(self):
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return self.data['id']
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def to_dict(self):
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return self.data
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