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inlinecallbacks

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Jack Robison 2017-09-07 11:54:39 -04:00
parent 1148a533bf
commit a72fef07c0
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1 changed files with 10 additions and 13 deletions
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23
lbrynet/cryptstream/CryptBlob.py
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@ -1,5 +1,6 @@
import binascii
import logging
from twisted.internet import defer
from cryptography.hazmat.primitives.ciphers import Cipher, modes
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.padding import PKCS7
@ -115,23 +116,19 @@ class CryptStreamBlobMaker(object):
self.blob.write(encrypted_data)
return done, num_bytes_to_write
@defer.inlineCallbacks
def close(self):
log.debug("closing blob %s with plaintext len %s", str(self.blob_num), str(self.length))
if self.length != 0:
self._close_buffer()
d = self.blob.close()
d.addCallback(self._return_info)
self.length += (AES.block_size / 8) - (self.length % (AES.block_size / 8))
padded_data = self.padder.finalize()
encrypted_data = self.cipher.update(padded_data) + self.cipher.finalize()
self.blob.write(encrypted_data)
blob_hash = yield self.blob.close()
log.debug("called the finished_callback from CryptStreamBlobMaker.close")
return d
def _close_buffer(self):
self.length += (AES.block_size / 8) - (self.length % (AES.block_size / 8))
padded_data = self.padder.finalize()
encrypted_data = self.cipher.update(padded_data) + self.cipher.finalize()
self.blob.write(encrypted_data)
def _return_info(self, blob_hash):
return CryptBlobInfo(blob_hash, self.blob_num, self.length, binascii.hexlify(self.iv))
blob = CryptBlobInfo(blob_hash, self.blob_num, self.length, binascii.hexlify(self.iv))
defer.returnValue(blob)
def greatest_multiple(a, b):