52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
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# standard imports
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import logging
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# third-party imports
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import web3
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# local imports
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from .mined import MinedSyncer
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from .base import Syncer
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logg = logging.getLogger()
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class HeadSyncer(MinedSyncer):
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"""Implements the get method in Syncer for retrieving every new mined block.
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:param bc_cache: Retrieves block cache cursors for chain head and latest processed block.
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:type bc_cache: Object implementing methods from cic_eth.sync.SyncerBackend
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"""
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def __init__(self, bc_cache):
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super(HeadSyncer, self).__init__(bc_cache)
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# TODO: filter not returning all blocks, at least with ganache. kind of defeats the point, then
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#self.w3_filter = rpc.w3.eth.filter({
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# 'fromBlock': block_offset,
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# }) #'latest')
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#self.bc_cache.set(block_offset, 0)
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logg.debug('initialized head syncer with offset {}'.format(bc_cache.start()))
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"""Implements Syncer.get
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:param w3: Web3 object
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:type w3: web3.Web3
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:returns: Block hash of newly mined blocks. if any
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:rtype: list of str, 0x-hex
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"""
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def get(self, w3):
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# Of course, the filter doesn't return the same block dict format as getBlock() so we'll just waste some cycles getting the hashes instead.
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#hashes = []
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#for block in self.w3_filter.get_new_entries():
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# hashes.append(block['blockHash'])
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#logg.debug('blocks {}'.format(hashes))
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#return hashes
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(block_number, tx_number) = self.bc_cache.get()
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block_hash = []
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try:
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block = w3.eth.getBlock(block_number)
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block_hash.append(block.hash)
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except web3.exceptions.BlockNotFound:
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pass
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return block_hash
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