def ftp_writable(tmpdir):
"""
Fixture providing a writable FTP filesystem.
"""
pytest.importorskip("pyftpdlib")
from fsspec.implementations.ftp import FTPFileSystem
FTPFileSystem.clear_instance_cache() # remove lingering connections
CachingFileSystem.clear_instance_cache()
d = str(tmpdir)
with open(os.path.join(d, "out"), "wb") as f:
f.write(b"hello" * 10000)
P = subprocess.Popen([
sys.executable, "-m", "pyftpdlib", "-d", d, "-u", "user", "-P", "pass",
"-w"
])
try:
time.sleep(1)
yield "localhost", 2121, "user", "pass"
finally:
P.terminate()
P.wait()
try:
shutil.rmtree(tmpdir)
except Exception:
pass
def test_equality():
"""Test sane behaviour for equality and hashing.
Make sure that different CachingFileSystem only test equal to each other
when they should, and do not test equal to the filesystem they rely upon.
Similarly, make sure their hashes differ when they should and are equal
when they should not.
Related: GitHub#577, GitHub#578
"""
from fsspec.implementations.local import LocalFileSystem
lfs = LocalFileSystem()
cfs1 = CachingFileSystem(fs=lfs, cache_storage="raspberry")
cfs2 = CachingFileSystem(fs=lfs, cache_storage="banana")
cfs3 = CachingFileSystem(fs=lfs, cache_storage="banana")
assert cfs1 == cfs1
assert cfs1 != cfs2
assert cfs1 != cfs3
assert cfs2 == cfs3
assert cfs1 != lfs
assert cfs2 != lfs
assert cfs3 != lfs
assert hash(lfs) != hash(cfs1)
assert hash(lfs) != hash(cfs2)
assert hash(lfs) != hash(cfs3)
assert hash(cfs1) != hash(cfs2)
assert hash(cfs1) != hash(cfs2)
assert hash(cfs2) == hash(cfs3)
def test_json():
"""Test that the JSON representation refers to correct class.
Make sure that the JSON representation of a CachingFileSystem refers to the
CachingFileSystem, not to the underlying filesystem.
"""
import json
from fsspec.implementations.local import LocalFileSystem
lfs = LocalFileSystem()
cfs = CachingFileSystem(fs=lfs, cache_storage="raspberry")
D = json.loads(cfs.to_json())
assert D["cls"].endswith("CachingFileSystem")
def test_hash(self):
"""Test that FSFile hashing behaves sanely."""
from fsspec.implementations.cached import CachingFileSystem
from fsspec.implementations.local import LocalFileSystem
from fsspec.implementations.zip import ZipFileSystem
from satpy.readers import FSFile
lfs = LocalFileSystem()
zfs = ZipFileSystem(self.zip_name)
cfs = CachingFileSystem(fs=lfs)
# make sure each name/fs-combi has its own hash
assert len({hash(FSFile(fn, fs))
for fn in {self.local_filename, self.local_filename2}
for fs in [None, lfs, zfs, cfs]}) == 2*4
def test_idempotent():
fs = CachingFileSystem("file")
fs2 = CachingFileSystem("file")
assert fs2 is fs
fs3 = pickle.loads(pickle.dumps(fs))
assert fs3.storage == fs.storage