86 lines
2.7 KiB
Python
86 lines
2.7 KiB
Python
# standard imports
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import logging
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# external imports
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from chainlib.eth.tx import (
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transaction,
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Tx,
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)
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# local imports
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from chainsyncer.error import NoBlockForYou
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from .poll import BlockPollSyncer
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logg = logging.getLogger(__name__)
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class HeadSyncer(BlockPollSyncer):
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"""Extends the block poller, implementing an open-ended syncer.
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"""
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name = 'head'
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def process(self, conn, block):
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"""Process a single block using the given RPC connection.
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Processing means that all filters are executed on all transactions in the block.
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If the block object does not contain the transaction details, the details will be retrieved from the network (incurring the corresponding performance penalty).
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:param conn: RPC connection
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:type conn: chainlib.connection.RPCConnection
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:param block: Block object
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:type block: chainlib.block.Block
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"""
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(pair, fltr) = self.backend.get()
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logg.debug('process block {} (backend {}:{})'.format(block, pair, fltr))
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i = pair[1] # set tx index from previous
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tx_src = None
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while True:
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# handle block objects regardless of whether the tx data is embedded or not
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try:
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tx = block.tx(i)
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except AttributeError:
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o = transaction(block.txs[i])
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r = conn.do(o)
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tx_src = Tx.src_normalize(r)
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tx = self.chain_interface.tx_from_src(tx_src, block=block)
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#except IndexError as e:
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# logg.debug('index error syncer tx get {}'.format(e))
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# break
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rcpt = conn.do(self.chain_interface.tx_receipt(tx.hash))
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if rcpt != None:
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tx.apply_receipt(self.chain_interface.src_normalize(rcpt))
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self.process_single(conn, block, tx)
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self.backend.reset_filter()
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i += 1
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def get(self, conn):
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"""Retrieve the block currently defined by the syncer cursor from the RPC provider.
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:param conn: RPC connection
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:type conn: chainlib.connectin.RPCConnection
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:raises NoBlockForYou: Block at the given height does not exist
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:rtype: chainlib.block.Block
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:returns: Block object
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"""
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(height, flags) = self.backend.get()
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block_number = height[0]
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block_hash = []
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o = self.chain_interface.block_by_number(block_number)
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try:
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r = conn.do(o)
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except RPCException:
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r = None
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if r == None:
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raise NoBlockForYou()
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b = self.chain_interface.block_from_src(r)
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b.txs = b.txs[height[1]:]
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return b
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