57 lines
1.2 KiB
Python
57 lines
1.2 KiB
Python
# standard imports
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import enum
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# local imports
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from .tx import Tx
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from .src import Src
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class BlockSpec(enum.IntEnum):
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"""General-purpose block-height value designators
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"""
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PENDING = -1
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LATEST = 0
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class Block(Src):
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"""Base class to extend for implementation specific block object.
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"""
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tx_generator = Tx
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def __init__(self, src=None):
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self.number = None
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self.txs = []
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self.author = None
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self.get_tx = self.tx_index_by_hash
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self.tx = self.tx_by_index
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self.fee_limit = 0
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self.fee_cost = 0
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self.parent_hash = None
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super(Block, self).__init__(src=src)
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def tx_by_index(self, idx):
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"""Return transaction object for transaction data at given index.
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:param idx: Transaction index
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:type idx: int
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:rtype: chainlib.tx.Tx
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:returns: Transaction object
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"""
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return self.tx_generator(self.txs[idx], self)
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def tx_index_by_hash(self, hsh):
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for tx in self.tx:
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if tx == hsh:
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return tx
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return -1
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def __str__(self):
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return 'block {} {} ({} txs)'.format(self.number, self.hash, len(self.txs))
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