60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
# standard imports
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import logging
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import time
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# local imports
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from .base import Syncer
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from chainsyncer.error import (
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SyncDone,
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NoBlockForYou,
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)
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logg = logging.getLogger(__name__)
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class BlockPollSyncer(Syncer):
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name = 'blockpoll'
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def __init__(self, backend, chain_interface, pre_callback=None, block_callback=None, post_callback=None):
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super(BlockPollSyncer, self).__init__(backend, chain_interface, pre_callback, block_callback, post_callback)
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def loop(self, interval, conn):
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(pair, fltr) = self.backend.get()
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start_tx = pair[1]
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while self.running and Syncer.running_global:
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if self.pre_callback != None:
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self.pre_callback()
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while True and Syncer.running_global:
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if start_tx > 0:
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start_tx -= 1
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continue
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try:
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block = self.get(conn)
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except SyncDone as e:
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logg.info('all blocks sumitted for processing: {}'.format(e))
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return self.backend.get()
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except NoBlockForYou as e:
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break
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# TODO: To properly handle this, ensure that previous request is rolled back
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# except sqlalchemy.exc.OperationalError as e:
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# logg.error('database error: {}'.format(e))
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# break
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if self.block_callback != None:
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self.block_callback(block, None)
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last_block = block
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try:
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self.process(conn, block)
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except IndexError:
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self.backend.set(block.number + 1, 0)
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start_tx = 0
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time.sleep(self.yield_delay)
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if self.post_callback != None:
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self.post_callback()
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time.sleep(interval)
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