44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
import logging
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from zope.interface import implements
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from twisted.internet import defer
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from lbrynet.cryptstream.CryptBlob import CryptBlobInfo
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from lbrynet.interfaces import IMetadataHandler
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log = logging.getLogger(__name__)
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class EncryptedFileMetadataHandler(object):
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implements(IMetadataHandler)
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def __init__(self, stream_hash, stream_info_manager, download_manager):
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self.stream_hash = stream_hash
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self.stream_info_manager = stream_info_manager
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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 self.stream_info_manager.get_blobs_for_stream(self.stream_hash)
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formatted_infos = self._format_initial_blobs_for_download_manager(blob_infos)
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defer.returnValue(formatted_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, (blob_hash, blob_num, iv, length) in enumerate(blob_infos):
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if blob_hash is not None and length:
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infos.append(CryptBlobInfo(blob_hash, blob_num, length, iv))
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else:
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if i != len(blob_infos) - 1:
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raise Exception("Invalid stream terminator")
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log.debug("Setting _final_blob_num to %s", str(blob_num - 1))
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self._final_blob_num = blob_num - 1
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return infos
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