|
| 1 | +import unittest |
| 2 | +import zlib |
| 3 | +from unittest.mock import MagicMock, patch |
| 4 | +from firebirdsql.stream import SocketStream |
| 5 | +from firebirdsql.consts import pflag_compress, ptype_MASK, ptype_lazy_send |
| 6 | + |
| 7 | + |
| 8 | +class TestCompressionStream(unittest.TestCase): |
| 9 | + """Test zlib compression/decompression in SocketStream.""" |
| 10 | + |
| 11 | + def test_roundtrip_compression(self): |
| 12 | + """Test that data compressed by compressor can be decompressed by decompressor.""" |
| 13 | + compressor = zlib.compressobj() |
| 14 | + decompressor = zlib.decompressobj() |
| 15 | + |
| 16 | + original = b'Hello, Firebird wire protocol compression!' |
| 17 | + compressed = compressor.compress(original) + compressor.flush(zlib.Z_SYNC_FLUSH) |
| 18 | + decompressed = decompressor.decompress(compressed) |
| 19 | + self.assertEqual(decompressed, original) |
| 20 | + |
| 21 | + def test_streaming_compression(self): |
| 22 | + """Test that streaming compression works across multiple messages.""" |
| 23 | + compressor = zlib.compressobj() |
| 24 | + decompressor = zlib.decompressobj() |
| 25 | + |
| 26 | + messages = [b'first message', b'second message', b'third message with more data'] |
| 27 | + recovered = [] |
| 28 | + for msg in messages: |
| 29 | + compressed = compressor.compress(msg) + compressor.flush(zlib.Z_SYNC_FLUSH) |
| 30 | + decompressed = decompressor.decompress(compressed) |
| 31 | + recovered.append(decompressed) |
| 32 | + |
| 33 | + self.assertEqual(recovered, messages) |
| 34 | + |
| 35 | + def test_compression_with_encryption(self): |
| 36 | + """Test that compression + encryption layering works correctly. |
| 37 | + Send order: compress -> encrypt. Receive order: decrypt -> decompress.""" |
| 38 | + from firebirdsql.arc4 import ARC4 |
| 39 | + |
| 40 | + compressor = zlib.compressobj() |
| 41 | + decompressor = zlib.decompressobj() |
| 42 | + enc = ARC4.new(b'test_key') |
| 43 | + dec = ARC4.new(b'test_key') |
| 44 | + |
| 45 | + original = b'Test data for compress+encrypt round-trip' |
| 46 | + # Compress then encrypt |
| 47 | + compressed = compressor.compress(original) + compressor.flush(zlib.Z_SYNC_FLUSH) |
| 48 | + encrypted = enc.translate(compressed) |
| 49 | + # Decrypt then decompress |
| 50 | + decrypted = dec.translate(encrypted) |
| 51 | + decompressed = decompressor.decompress(decrypted) |
| 52 | + self.assertEqual(decompressed, original) |
| 53 | + |
| 54 | + def test_pflag_compress_detection(self): |
| 55 | + """Test that pflag_compress flag is correctly detected and stripped.""" |
| 56 | + accept_type = ptype_lazy_send | pflag_compress # 5 | 0x100 = 0x105 |
| 57 | + self.assertTrue(accept_type & pflag_compress) |
| 58 | + stripped = accept_type & ptype_MASK |
| 59 | + self.assertEqual(stripped, ptype_lazy_send) |
| 60 | + |
| 61 | + def test_pflag_compress_not_set(self): |
| 62 | + """Test that missing pflag_compress is correctly detected.""" |
| 63 | + accept_type = ptype_lazy_send # 5 |
| 64 | + self.assertFalse(accept_type & pflag_compress) |
| 65 | + |
| 66 | + def test_enable_compression_sets_compressor(self): |
| 67 | + """Test that enable_compression initializes zlib objects.""" |
| 68 | + with patch('socket.create_connection') as mock_conn: |
| 69 | + mock_sock = MagicMock() |
| 70 | + mock_conn.return_value = mock_sock |
| 71 | + stream = SocketStream('localhost', 3050) |
| 72 | + self.assertIsNone(stream._compressor) |
| 73 | + self.assertIsNone(stream._decompressor) |
| 74 | + stream.enable_compression() |
| 75 | + self.assertIsNotNone(stream._compressor) |
| 76 | + self.assertIsNotNone(stream._decompressor) |
| 77 | + |
| 78 | + def test_large_data_compression(self): |
| 79 | + """Test compression with larger data payloads.""" |
| 80 | + compressor = zlib.compressobj() |
| 81 | + decompressor = zlib.decompressobj() |
| 82 | + |
| 83 | + # Simulate a large query result |
| 84 | + original = b'A' * 100000 |
| 85 | + compressed = compressor.compress(original) + compressor.flush(zlib.Z_SYNC_FLUSH) |
| 86 | + # Compressed size should be significantly smaller for repetitive data |
| 87 | + self.assertLess(len(compressed), len(original)) |
| 88 | + decompressed = decompressor.decompress(compressed) |
| 89 | + self.assertEqual(decompressed, original) |
| 90 | + |
| 91 | + |
| 92 | +if __name__ == '__main__': |
| 93 | + unittest.main() |
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