55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
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import logging
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from io import BytesIO
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from twisted.python.failure import Failure
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from lbrynet.core.Error import DownloadCanceledError, InvalidDataError
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from lbrynet.core.cryptoutils import get_lbry_hash_obj
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log = logging.getLogger(__name__)
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class HashBlobWriter(object):
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def __init__(self, length_getter, finished_cb):
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self.write_handle = BytesIO()
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self.length_getter = length_getter
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self.finished_cb = finished_cb
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self.finished_cb_d = None
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self._hashsum = get_lbry_hash_obj()
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self.len_so_far = 0
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@property
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def blob_hash(self):
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return self._hashsum.hexdigest()
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def write(self, data):
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if self.write_handle is None:
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log.info("writer has already been closed")
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# can this be changed to IOError?
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raise ValueError('I/O operation on closed file')
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self._hashsum.update(data)
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self.len_so_far += len(data)
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if self.len_so_far > self.length_getter():
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self.finished_cb_d = self.finished_cb(
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self,
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Failure(InvalidDataError("Length so far is greater than the expected length."
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" %s to %s" % (self.len_so_far,
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self.length_getter()))))
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else:
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self.write_handle.write(data)
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if self.len_so_far == self.length_getter():
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self.finished_cb_d = self.finished_cb(self)
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def close_handle(self):
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if self.write_handle is not None:
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self.write_handle.close()
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self.write_handle = None
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def close(self, reason=None):
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# if we've already called finished_cb because we either finished writing
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# or closed already, do nothing
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if self.finished_cb_d is not None:
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return
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if reason is None:
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reason = Failure(DownloadCanceledError())
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self.finished_cb_d = self.finished_cb(self, reason)
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