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Fix GCSFS walk() method #561

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Fix GCSFS walk() method #561

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5a18399
Fix GCSFS walk() method
megaserg Jun 14, 2020
b87919b
[gcsfs] Consider trailing slash when skipping directories
megaserg Jun 23, 2020
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38 changes: 16 additions & 22 deletions petastorm/gcsfs_helpers/gcsfs_wrapper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,7 @@ def isdir(self, path):
path = norm_path(_stringify_path(path))
try:
contents = self.fs.ls(path)
if len(contents) == 1 and contents[0] == path:
return False
else:
return True
return not(len(contents) == 1 and contents[0] == path)
except OSError:
return False

Expand All @@ -41,26 +38,23 @@ def walk(self, path):
directories = set()
files = set()

for key in self.fs.ls(path, detail=True):
for obj in self.fs.ls(path, detail=True):
# each info name must be at least [path]/part , but here
# we check also for names like [path]/part/
path = key['name']
if key['storageClass'] == 'DIRECTORY':
if path.endswith('/'):
directories.add(path[:-1])
else:
directories.add(path)
elif key['storageClass'] == 'BUCKET':
pass
else:
files.add(path)

files = sorted([posixpath.split(f)[1] for f in files
if f not in directories])
directories = sorted([posixpath.split(x)[1]
for x in directories])

yield path, directories, files
obj_path = obj['name']
if obj_path == path:
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This check still fails to catch the desired directory. obj_path has an extra '/' on the end which path does not.

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Thanks, I was able to reproduce, but for some reason only when I provided a directory that didn't contain files, only other directories.

continue
if obj['type'] == 'directory':
directories.add(obj_path)
elif obj['type'] == 'file':
files.add(obj_path)

rel_files = sorted([posixpath.split(f)[1] for f in files
if f not in directories])
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What's the purpose of checking if f not in directories? Could there be an entry in files that is also in directories?

rel_directories = sorted([posixpath.split(x[:-1])[1]
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More self explanatory, IMO: x[:-1] -> x.rstrip('/').

for x in directories])

yield path, rel_directories, rel_files
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When path is invalid, the function still yields once. This does not match os.walk semantics which would not yield at all in that case.


for directory in directories:
for tup in self.walk(directory):
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