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test_backends_file_manager.py
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test_backends_file_manager.py
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import gc
import pickle
import threading
from unittest import mock
import pytest
from xarray.backends.file_manager import CachingFileManager
from xarray.backends.lru_cache import LRUCache
from xarray.core.options import set_options
@pytest.fixture(params=[1, 2, 3, None])
def file_cache(request):
maxsize = request.param
if maxsize is None:
yield {}
else:
yield LRUCache(maxsize)
def test_file_manager_mock_write(file_cache):
mock_file = mock.Mock()
opener = mock.Mock(spec=open, return_value=mock_file)
lock = mock.MagicMock(spec=threading.Lock())
manager = CachingFileManager(opener, "filename", lock=lock, cache=file_cache)
f = manager.acquire()
f.write("contents")
manager.close()
assert not file_cache
opener.assert_called_once_with("filename")
mock_file.write.assert_called_once_with("contents")
mock_file.close.assert_called_once_with()
lock.__enter__.assert_has_calls([mock.call(), mock.call()])
@pytest.mark.parametrize("expected_warning", [None, RuntimeWarning])
def test_file_manager_autoclose(expected_warning):
mock_file = mock.Mock()
opener = mock.Mock(return_value=mock_file)
cache = {}
manager = CachingFileManager(opener, "filename", cache=cache)
manager.acquire()
assert cache
with set_options(warn_for_unclosed_files=expected_warning is not None):
with pytest.warns(expected_warning):
del manager
gc.collect()
assert not cache
mock_file.close.assert_called_once_with()
def test_file_manager_autoclose_while_locked():
opener = mock.Mock()
lock = threading.Lock()
cache = {}
manager = CachingFileManager(opener, "filename", lock=lock, cache=cache)
manager.acquire()
assert cache
lock.acquire()
with set_options(warn_for_unclosed_files=False):
del manager
gc.collect()
# can't clear the cache while locked, but also don't block in __del__
assert cache
def test_file_manager_repr():
opener = mock.Mock()
manager = CachingFileManager(opener, "my-file")
assert "my-file" in repr(manager)
def test_file_manager_refcounts():
mock_file = mock.Mock()
opener = mock.Mock(spec=open, return_value=mock_file)
cache = {}
ref_counts = {}
manager = CachingFileManager(opener, "filename", cache=cache, ref_counts=ref_counts)
assert ref_counts[manager._key] == 1
manager.acquire()
assert cache
manager2 = CachingFileManager(
opener, "filename", cache=cache, ref_counts=ref_counts
)
assert cache
assert manager._key == manager2._key
assert ref_counts[manager._key] == 2
with set_options(warn_for_unclosed_files=False):
del manager
gc.collect()
assert cache
assert ref_counts[manager2._key] == 1
mock_file.close.assert_not_called()
with set_options(warn_for_unclosed_files=False):
del manager2
gc.collect()
assert not ref_counts
assert not cache
def test_file_manager_replace_object():
opener = mock.Mock()
cache = {}
ref_counts = {}
manager = CachingFileManager(opener, "filename", cache=cache, ref_counts=ref_counts)
manager.acquire()
assert ref_counts[manager._key] == 1
assert cache
manager = CachingFileManager(opener, "filename", cache=cache, ref_counts=ref_counts)
assert ref_counts[manager._key] == 1
assert cache
manager.close()
def test_file_manager_write_consecutive(tmpdir, file_cache):
path1 = str(tmpdir.join("testing1.txt"))
path2 = str(tmpdir.join("testing2.txt"))
manager1 = CachingFileManager(open, path1, mode="w", cache=file_cache)
manager2 = CachingFileManager(open, path2, mode="w", cache=file_cache)
f1a = manager1.acquire()
f1a.write("foo")
f1a.flush()
f2 = manager2.acquire()
f2.write("bar")
f2.flush()
f1b = manager1.acquire()
f1b.write("baz")
assert (getattr(file_cache, "maxsize", float("inf")) > 1) == (f1a is f1b)
manager1.close()
manager2.close()
with open(path1, "r") as f:
assert f.read() == "foobaz"
with open(path2, "r") as f:
assert f.read() == "bar"
def test_file_manager_write_concurrent(tmpdir, file_cache):
path = str(tmpdir.join("testing.txt"))
manager = CachingFileManager(open, path, mode="w", cache=file_cache)
f1 = manager.acquire()
f2 = manager.acquire()
f3 = manager.acquire()
assert f1 is f2
assert f2 is f3
f1.write("foo")
f1.flush()
f2.write("bar")
f2.flush()
f3.write("baz")
f3.flush()
manager.close()
with open(path, "r") as f:
assert f.read() == "foobarbaz"
def test_file_manager_write_pickle(tmpdir, file_cache):
path = str(tmpdir.join("testing.txt"))
manager = CachingFileManager(open, path, mode="w", cache=file_cache)
f = manager.acquire()
f.write("foo")
f.flush()
manager2 = pickle.loads(pickle.dumps(manager))
f2 = manager2.acquire()
f2.write("bar")
manager2.close()
manager.close()
with open(path, "r") as f:
assert f.read() == "foobar"
def test_file_manager_read(tmpdir, file_cache):
path = str(tmpdir.join("testing.txt"))
with open(path, "w") as f:
f.write("foobar")
manager = CachingFileManager(open, path, cache=file_cache)
f = manager.acquire()
assert f.read() == "foobar"
manager.close()
def test_file_manager_invalid_kwargs():
with pytest.raises(TypeError):
CachingFileManager(open, "dummy", mode="w", invalid=True)
def test_file_manager_acquire_context(tmpdir, file_cache):
path = str(tmpdir.join("testing.txt"))
with open(path, "w") as f:
f.write("foobar")
class AcquisitionError(Exception):
pass
manager = CachingFileManager(open, path, cache=file_cache)
with pytest.raises(AcquisitionError):
with manager.acquire_context() as f:
assert f.read() == "foobar"
raise AcquisitionError
assert not file_cache # file was *not* already open
with manager.acquire_context() as f:
assert f.read() == "foobar"
with pytest.raises(AcquisitionError):
with manager.acquire_context() as f:
f.seek(0)
assert f.read() == "foobar"
raise AcquisitionError
assert file_cache # file *was* already open
manager.close()