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opt/gsutil/third_party/apitools/apitools/base/py/compression_test.py 0000644 00000012305 15025422441 0022206 0 ustar 00 #!/usr/bin/env python # # Copyright 2017 Google Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Tests for compression.""" import unittest from apitools.base.py import compression from apitools.base.py import gzip import six class CompressionTest(unittest.TestCase): def setUp(self): # Sample highly compressible data (~50MB). self.sample_data = b'abc' * 16777216 # Stream of the sample data. self.stream = six.BytesIO() self.stream.write(self.sample_data) self.length = self.stream.tell() self.stream.seek(0) def testCompressionExhausted(self): """Test full compression. Test that highly compressible data is actually compressed in entirety. """ output, read, exhausted = compression.CompressStream( self.stream, self.length, 9) # Ensure the compressed buffer is smaller than the input buffer. self.assertLess(output.length, self.length) # Ensure we read the entire input stream. self.assertEqual(read, self.length) # Ensure the input stream was exhausted. self.assertTrue(exhausted) def testCompressionUnbounded(self): """Test unbounded compression. Test that the input stream is exhausted when length is none. """ output, read, exhausted = compression.CompressStream( self.stream, None, 9) # Ensure the compressed buffer is smaller than the input buffer. self.assertLess(output.length, self.length) # Ensure we read the entire input stream. self.assertEqual(read, self.length) # Ensure the input stream was exhausted. self.assertTrue(exhausted) def testCompressionPartial(self): """Test partial compression. Test that the length parameter works correctly. The amount of data that's compressed can be greater than or equal to the requested length. """ output_length = 40 output, _, exhausted = compression.CompressStream( self.stream, output_length, 9) # Ensure the requested read size is <= the compressed buffer size. self.assertLessEqual(output_length, output.length) # Ensure the input stream was not exhausted. self.assertFalse(exhausted) def testCompressionIntegrity(self): """Test that compressed data can be decompressed.""" output, read, exhausted = compression.CompressStream( self.stream, self.length, 9) # Ensure uncompressed data matches the sample data. with gzip.GzipFile(fileobj=output) as f: original = f.read() self.assertEqual(original, self.sample_data) # Ensure we read the entire input stream. self.assertEqual(read, self.length) # Ensure the input stream was exhausted. self.assertTrue(exhausted) class StreamingBufferTest(unittest.TestCase): def setUp(self): self.stream = compression.StreamingBuffer() def testSimpleStream(self): """Test simple stream operations. Test that the stream can be written to and read from. Also test that reading from the stream consumes the bytes. """ # Ensure the stream is empty. self.assertEqual(self.stream.length, 0) # Ensure data is correctly written. self.stream.write(b'Sample data') self.assertEqual(self.stream.length, 11) # Ensure data can be read and the read data is purged from the stream. data = self.stream.read(11) self.assertEqual(data, b'Sample data') self.assertEqual(self.stream.length, 0) def testPartialReads(self): """Test partial stream reads. Test that the stream can be read in chunks while perserving the consumption mechanics. """ self.stream.write(b'Sample data') # Ensure data can be read and the read data is purged from the stream. data = self.stream.read(6) self.assertEqual(data, b'Sample') self.assertEqual(self.stream.length, 5) # Ensure the remaining data can be read. data = self.stream.read(5) self.assertEqual(data, b' data') self.assertEqual(self.stream.length, 0) def testTooShort(self): """Test excessive stream reads. Test that more data can be requested from the stream than available without raising an exception. """ self.stream.write(b'Sample') # Ensure requesting more data than available does not raise an # exception. data = self.stream.read(100) self.assertEqual(data, b'Sample') self.assertEqual(self.stream.length, 0)
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