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# Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, dis- # tribute, sublicense, and/or sell copies of the Software, and to permit # persons to whom the Software is furnished to do so, subject to the fol- # lowing conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS # IN THE SOFTWARE. # import logging import os import tempfile import time from hashlib import sha256 from tests.unit import unittest from boto.compat import BytesIO, six, StringIO from boto.glacier.utils import minimum_part_size, chunk_hashes, tree_hash, \ bytes_to_hex, compute_hashes_from_fileobj class TestPartSizeCalculations(unittest.TestCase): def test_small_values_still_use_default_part_size(self): self.assertEqual(minimum_part_size(1), 4 * 1024 * 1024) def test_under_the_maximum_value(self): # If we're under the maximum, we can use 4MB part sizes. self.assertEqual(minimum_part_size(8 * 1024 * 1024), 4 * 1024 * 1024) def test_gigabyte_size(self): # If we're over the maximum default part size, we go up to the next # power of two until we find a part size that keeps us under 10,000 # parts. self.assertEqual(minimum_part_size(8 * 1024 * 1024 * 10000), 8 * 1024 * 1024) def test_terabyte_size(self): # For a 4 TB file we need at least a 512 MB part size. self.assertEqual(minimum_part_size(4 * 1024 * 1024 * 1024 * 1024), 512 * 1024 * 1024) def test_file_size_too_large(self): with self.assertRaises(ValueError): minimum_part_size((40000 * 1024 * 1024 * 1024) + 1) def test_default_part_size_can_be_specified(self): default_part_size = 2 * 1024 * 1024 self.assertEqual(minimum_part_size(8 * 1024 * 1024, default_part_size), default_part_size) class TestChunking(unittest.TestCase): def test_chunk_hashes_exact(self): chunks = chunk_hashes(b'a' * (2 * 1024 * 1024)) self.assertEqual(len(chunks), 2) self.assertEqual(chunks[0], sha256(b'a' * 1024 * 1024).digest()) def test_chunks_with_leftovers(self): bytestring = b'a' * (2 * 1024 * 1024 + 20) chunks = chunk_hashes(bytestring) self.assertEqual(len(chunks), 3) self.assertEqual(chunks[0], sha256(b'a' * 1024 * 1024).digest()) self.assertEqual(chunks[1], sha256(b'a' * 1024 * 1024).digest()) self.assertEqual(chunks[2], sha256(b'a' * 20).digest()) def test_less_than_one_chunk(self): chunks = chunk_hashes(b'aaaa') self.assertEqual(len(chunks), 1) self.assertEqual(chunks[0], sha256(b'aaaa').digest()) class TestTreeHash(unittest.TestCase): # For these tests, a set of reference tree hashes were computed. # This will at least catch any regressions to the tree hash # calculations. def calculate_tree_hash(self, bytestring): start = time.time() calculated = bytes_to_hex(tree_hash(chunk_hashes(bytestring))) end = time.time() logging.debug("Tree hash calc time for length %s: %s", len(bytestring), end - start) return calculated def test_tree_hash_calculations(self): one_meg_bytestring = b'a' * (1 * 1024 * 1024) two_meg_bytestring = b'a' * (2 * 1024 * 1024) four_meg_bytestring = b'a' * (4 * 1024 * 1024) bigger_bytestring = four_meg_bytestring + b'a' * 20 self.assertEqual( self.calculate_tree_hash(one_meg_bytestring), b'9bc1b2a288b26af7257a36277ae3816a7d4f16e89c1e7e77d0a5c48bad62b360') self.assertEqual( self.calculate_tree_hash(two_meg_bytestring), b'560c2c9333c719cb00cfdffee3ba293db17f58743cdd1f7e4055373ae6300afa') self.assertEqual( self.calculate_tree_hash(four_meg_bytestring), b'9491cb2ed1d4e7cd53215f4017c23ec4ad21d7050a1e6bb636c4f67e8cddb844') self.assertEqual( self.calculate_tree_hash(bigger_bytestring), b'12f3cbd6101b981cde074039f6f728071da8879d6f632de8afc7cdf00661b08f') def test_empty_tree_hash(self): self.assertEqual( self.calculate_tree_hash(''), b'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855') class TestFileHash(unittest.TestCase): def _gen_data(self): # Generate some pseudo-random bytes of data. We include the # hard-coded blob as an example that fails to decode via UTF-8. return os.urandom(5000) + b'\xc2\x00' def test_compute_hash_tempfile(self): # Compute a hash from a file object. On Python 2 this uses a non- # binary mode. On Python 3, however, binary mode is required for # binary files. If not used, you will get UTF-8 code errors. if six.PY2: mode = "w+" else: mode = "wb+" with tempfile.TemporaryFile(mode=mode) as f: f.write(self._gen_data()) f.seek(0) compute_hashes_from_fileobj(f, chunk_size=512) @unittest.skipUnless(six.PY3, 'Python 3 requires reading binary!') def test_compute_hash_tempfile_py3(self): # Note the missing 'b' in the mode! with tempfile.TemporaryFile(mode='w+') as f: with self.assertRaises(ValueError): compute_hashes_from_fileobj(f, chunk_size=512) # What about file-like objects without a mode? If it has an # encoding we use it, otherwise attempt UTF-8 encoding to # bytes for hashing. f = StringIO('test data' * 500) compute_hashes_from_fileobj(f, chunk_size=512) @unittest.skipUnless(six.PY2, 'Python 3 requires reading binary!') def test_compute_hash_stringio(self): # Python 2 binary data in StringIO example f = StringIO(self._gen_data()) compute_hashes_from_fileobj(f, chunk_size=512) def test_compute_hash_bytesio(self): # Compute a hash from a file-like BytesIO object. f = BytesIO(self._gen_data()) compute_hashes_from_fileobj(f, chunk_size=512)