41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
import logging
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from twisted.internet import defer
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from lbrynet.extras.compat import f2d
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log = logging.getLogger(__name__)
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class EncryptedFileMetadataHandler:
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def __init__(self, stream_hash, storage, download_manager):
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self.stream_hash = stream_hash
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self.storage = storage
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self.download_manager = download_manager
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self._final_blob_num = None
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######### IMetadataHandler #########
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@defer.inlineCallbacks
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def get_initial_blobs(self):
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blob_infos = yield f2d(self.storage.get_blobs_for_stream(self.stream_hash))
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return self._format_initial_blobs_for_download_manager(blob_infos)
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def final_blob_num(self):
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return self._final_blob_num
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######### internal calls #########
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def _format_initial_blobs_for_download_manager(self, blob_infos):
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infos = []
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for i, crypt_blob in enumerate(blob_infos):
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if crypt_blob.blob_hash is not None and crypt_blob.length:
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infos.append(crypt_blob)
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else:
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if i != len(blob_infos) - 1:
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raise Exception("Invalid stream terminator: %i of %i" %
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(i, len(blob_infos) - 1))
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log.debug("Setting _final_blob_num to %s", str(crypt_blob.blob_num - 1))
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self._final_blob_num = crypt_blob.blob_num - 1
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return infos
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