Python Bigchain.transaction_exists方法代码示例

# 需要导入模块: from bigchaindb import Bigchain [as 别名]
# 或者: from bigchaindb.Bigchain import transaction_exists [as 别名]
class Block:
    """This class encapsulates the logic to create blocks.

    Note:
        Methods of this class will be executed in different processes.
    """

    def __init__(self):
        """Initialize the Block creator"""
        self.bigchain = Bigchain()
        self.txs = []

    def filter_tx(self, tx):
        """Filter a transaction.

        Args:
            tx (dict): the transaction to process.

        Returns:
            The transaction if assigned to the current node,
            ``None`` otherwise.
        """

        if tx['assignee'] == self.bigchain.me:
            tx.pop('assignee')
            tx.pop('assignment_timestamp')
            return tx

    def validate_tx(self, tx):
        """Validate a transaction.
        Also checks if the transaction already exists in the blockchain. If it
        does, or it's invalid, it's deleted from the backlog immediately.
        Args:
            tx (dict): the transaction to validate.
        Returns:
            The transaction if valid, ``None`` otherwise.
        """
        if self.bigchain.transaction_exists(tx['id']):
            # if the transaction already exists, we must check whether
            # it's in a valid or undecided block
            tx, status = self.bigchain.get_transaction(tx['id'],
                                                       include_status=True)
            if status == self.bigchain.TX_VALID \
               or status == self.bigchain.TX_UNDECIDED:
                # if the tx is already in a valid or undecided block,
                # then it no longer should be in the backlog, or added
                # to a new block. We can delete and drop it.
                r.table('backlog').get(tx['id']) \
                        .delete(durability='hard') \
                        .run(self.bigchain.conn)
                return None

        tx_validated = self.bigchain.is_valid_transaction(tx)
        if tx_validated:
            return tx
        else:
            # if the transaction is not valid, remove it from the
            # backlog
            r.table('backlog').get(tx['id']) \
                    .delete(durability='hard') \
                    .run(self.bigchain.conn)
            return None

    def create(self, tx, timeout=False):
        """Create a block.

        This method accumulates transactions to put in a block and outputs
        a block when one of the following conditions is true:
        - the size limit of the block has been reached, or
        - a timeout happened.

        Args:
            tx (dict): the transaction to validate, might be None if
                a timeout happens.
            timeout (bool): ``True`` if a timeout happened
                (Default: ``False``).

        Returns:
            The block, if a block is ready, or ``None``.
        """
        if tx:
            self.txs.append(tx)
        if len(self.txs) == 1000 or (timeout and self.txs):
            block = self.bigchain.create_block(self.txs)
            self.txs = []
            return block

    def write(self, block):
        """Write the block to the Database.

        Args:
            block (dict): the block of transactions to write to the database.

        Returns:
            The block.
        """
        logger.info('Write new block %s with %s transactions',
                    block['id'],
                    len(block['block']['transactions']))
        self.bigchain.write_block(block)
#.........这里部分代码省略.........

# 需要导入模块: from bigchaindb import Bigchain [as 别名]
# 或者: from bigchaindb.Bigchain import transaction_exists [as 别名]
from bigchaindb import Bigchain
import writeout

b = Bigchain()


for x in range(1,8):
    tx_signed = writeout.importData("user"+str(x)+"vote")
    tx_retrieved = b.get_transaction(tx_signed['id'])
    print(b.transaction_exists(tx_retrieved['id']))