70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
import logging
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import zlib
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from data import model
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from data.database import ImageStorage
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from app import app, storage as store
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from data.database import db, db_random_func
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from util.gzipstream import ZLIB_GZIP_WINDOW
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logger = logging.getLogger(__name__)
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CHUNK_SIZE = 5 * 1024 * 1024
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def backfill_sizes_from_data():
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while True:
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# Load the record from the DB.
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batch_ids = list(ImageStorage
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.select(ImageStorage.uuid)
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.where(ImageStorage.uncompressed_size >> None,
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ImageStorage.uploading == False)
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.limit(100)
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.order_by(db_random_func()))
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if len(batch_ids) == 0:
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# We're done!
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return
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for record in batch_ids:
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uuid = record.uuid
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with_locations = model.get_storage_by_uuid(uuid)
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if with_locations.uncompressed_size is not None:
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logger.debug('Somebody else already filled this in for us: %s', uuid)
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continue
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# Read the layer from backing storage and calculate the uncompressed size.
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logger.debug('Loading data: %s (%s bytes)', uuid, with_locations.image_size)
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decompressor = zlib.decompressobj(ZLIB_GZIP_WINDOW)
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uncompressed_size = 0
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with store.stream_read_file(with_locations.locations, store.image_layer_path(uuid)) as stream:
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while True:
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current_data = stream.read(CHUNK_SIZE)
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if len(current_data) == 0:
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break
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uncompressed_size += len(decompressor.decompress(current_data))
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# Write the size to the image storage. We do so under a transaction AFTER checking to
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# make sure the image storage still exists and has not changed.
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logger.debug('Writing entry: %s. Size: %s', uuid, uncompressed_size)
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with app.config['DB_TRANSACTION_FACTORY'](db):
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try:
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current_record = model.get_storage_by_uuid(uuid)
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except model.InvalidImageException:
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logger.warning('Storage with uuid no longer exists: %s', uuid)
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continue
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if not current_record.uploading and current_record.uncompressed_size == None:
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current_record.uncompressed_size = uncompressed_size
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current_record.save()
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if __name__ == "__main__":
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logging.basicConfig(level=logging.DEBUG)
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logging.getLogger('boto').setLevel(logging.CRITICAL)
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backfill_sizes_from_data()
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