58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
# standard imports
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import logging
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# local imports
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from .error import BackendError
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logg = logging.getLogger(__name__)
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class SyncFilter:
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def __init__(self, backend):
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self.filters = []
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self.backend = backend
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def add(self, fltr):
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if getattr(fltr, 'filter') == None:
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raise ValueError('filter object must implement have method filter')
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logg.debug('added filter "{}"'.format(str(fltr)))
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self.filters.append(fltr)
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def apply_one(self, fltr, idx, conn, block, tx, session):
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fltr.filter(conn, block, tx, session)
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self.backend.complete_filter(idx)
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def apply(self, conn, block, tx):
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session = None
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try:
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session = self.backend.connect()
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except TimeoutError as e:
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self.backend.disconnect()
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raise BackendError('database connection fail: {}'.format(e))
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i = 0
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(pair, flags) = self.backend.get()
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for f in self.filters:
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if not self.backend.check_filter(i, flags):
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logg.debug('applying filter {} {}'.format(str(f), flags))
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self.apply_one(f, i, conn, block, tx, session)
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else:
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logg.debug('skipping previously applied filter {} {}'.format(str(f), flags))
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i += 1
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self.backend.disconnect()
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class NoopFilter:
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def filter(self, conn, block, tx, db_session=None):
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logg.debug('noop filter :received\n{} {} {}'.format(block, tx, id(db_session)))
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def __str__(self):
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return 'noopfilter'
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