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https://github.com/Stone-Red-Code/dvc.git
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Saugat Pachhai (सौगात)
752e10a834
Now HashedStreamReader will be used to calculate md5 in fobj_md5/hash_file. Also: * adds in `bytes_md5` that may be useful for testing. * adds a hasher-registry with hashlib * adds a `text=` kwarg to be able to specify to use dos2unix or not (useful for testing) * makes `localfs` the default filesystem when `fs` arg is not passed (makes it easier to test in the REPL)
74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
import pytest
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from dvc.objects.fs import LocalFileSystem
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from dvc.objects.hash import HashedStreamReader, file_md5
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from dvc.objects.istextfile import DEFAULT_CHUNK_SIZE, istextfile
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def test_hashed_stream_reader(tmp_dir):
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tmp_dir.gen({"foo": "foo"})
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foo = tmp_dir / "foo"
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with open(foo, "rb") as fobj:
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stream_reader = HashedStreamReader(fobj)
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assert stream_reader.readable()
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assert not stream_reader.seekable()
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assert stream_reader.read(2) == b"fo"
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assert stream_reader.tell() == 2
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assert stream_reader.read(1) == b"o"
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assert stream_reader.tell() == 3
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hex_digest = file_md5(foo, LocalFileSystem())
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assert stream_reader.is_text
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assert hex_digest == stream_reader.hash_value
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def test_hashed_stream_reader_as_chunks(tmp_dir):
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tmp_dir.gen({"foo": b"foo \x00" * 16})
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foo = tmp_dir / "foo"
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actual_size = len(foo.read_bytes())
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with open(foo, "rb") as fobj:
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stream_reader = HashedStreamReader(fobj)
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total_read = 0
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while True:
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chunk = stream_reader.read(16)
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total_read += len(chunk)
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assert stream_reader.tell() == total_read
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if not chunk:
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break
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assert stream_reader.tell() == actual_size == total_read
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hex_digest = file_md5(foo, LocalFileSystem())
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assert not stream_reader.is_text
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assert hex_digest == stream_reader.hash_value
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@pytest.mark.parametrize(
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"contents",
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[b"x" * DEFAULT_CHUNK_SIZE + b"\x00", b"clean", b"not clean \x00"],
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)
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def test_hashed_stream_reader_compatibility(tmp_dir, contents):
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# Always read more than the DEFAULT_CHUNK_SIZE (512 bytes).
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# This imitates the read actions performed by upload_fobj.
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chunk_size = DEFAULT_CHUNK_SIZE * 2
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tmp_dir.gen("data", contents)
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data = tmp_dir / "data"
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with open(data, "rb") as fobj:
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stream_reader = HashedStreamReader(fobj)
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stream_reader.read(chunk_size)
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local_fs = LocalFileSystem()
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hex_digest = file_md5(data, local_fs)
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assert stream_reader.is_text is istextfile(data, local_fs)
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assert stream_reader.hash_value == hex_digest
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