Merge pull request OSGeo#10985 from rouault/gdal_fsspec

Python bindings: add a osgeo.gdal_fsspec module that on import will register GDAL VSI file system handlers as fsspec AbstractFileSystem

.github/workflows/cmake_builds.yml

@@ -433,7 +433,7 @@ jobs:
             cfitsio freexl geotiff libjpeg-turbo libpq libspatialite libwebp-base pcre pcre2 postgresql \
             sqlite tiledb zstd cryptopp cgal doxygen librttopo libkml openssl xz \
             openjdk ant qhull armadillo blas blas-devel libblas libcblas liblapack liblapacke blosc libarchive \
-            arrow-cpp pyarrow libaec libheif libavif cmake
+            arrow-cpp pyarrow libaec libheif libavif cmake fsspec
     - name: Check CMake version
       shell: bash -l {0}
       run: |

.github/workflows/ubuntu_24.04/Dockerfile.ci

@@ -158,3 +158,5 @@ RUN python3 -m pip install -U --break-system-packages -r /tmp/requirements.txt
 # cfchecker requires udunits2
 RUN apt-get install -y --allow-unauthenticated libudunits2-0 libudunits2-data
 RUN python3 -m pip install --break-system-packages cfchecker
+
+RUN python3 -m pip install --break-system-packages fsspec

.pre-commit-config.yaml

@@ -5,7 +5,8 @@ repos:
         -   id: black
             exclude: >
               (?x)^(
-                swig/python/osgeo/|
+                swig/python/osgeo/__init__.py|
+                swig/python/osgeo/gdalnumeric.py|
                 autotest/ogr/data/
               )
     -   repo: https://github.com/timothycrosley/isort
@@ -14,7 +15,8 @@ repos:
         -   id: isort
             exclude: >
               (?x)^(
-                swig/python/osgeo/|
+                swig/python/osgeo/__init__.py|
+                swig/python/osgeo/gdalnumeric.py|
                 autotest/ogr/data/
               )
     -   repo: https://github.com/pycqa/flake8
@@ -23,7 +25,8 @@ repos:
         -   id: flake8
             exclude: >
               (?x)^(
-                swig/python/osgeo/|
+                swig/python/osgeo/__init__.py|
+                swig/python/osgeo/gdalnumeric.py|
                 examples/|
                 autotest/ogr/data/
               )

autotest/gcore/test_gdal_fsspec.py

@@ -0,0 +1,225 @@
+#!/usr/bin/env pytest
+# -*- coding: utf-8 -*-
+###############################################################################
+# Project:  GDAL/OGR Test Suite
+# Purpose:  Test gdal_fsspec module
+# Author:   Even Rouault <even dot rouault at spatialys.com>
+#
+###############################################################################
+# Copyright (c) 20124, Even Rouault <even dot rouault at spatialys.com>
+#
+# SPDX-License-Identifier: MIT
+###############################################################################
+
+import pytest
+
+from osgeo import gdal
+
+fsspec = pytest.importorskip("fsspec")
+pytest.importorskip("fsspec.spec")
+
+from osgeo import gdal_fsspec  # NOQA
+
+
+def test_gdal_fsspec_open_read():
+
+    with fsspec.open("gdalvsi://data/byte.tif") as f:
+        assert len(f.read()) == gdal.VSIStatL("data/byte.tif").size
+
+
+def test_gdal_fsspec_info_file():
+
+    fs = fsspec.filesystem("gdalvsi")
+    info = fs.info("data/byte.tif")
+    assert "mtime" in info
+    del info["mtime"]
+    assert (info["mode"] & 32768) != 0
+    del info["mode"]
+    assert info == {
+        "name": "data/byte.tif",
+        "size": 736,
+        "type": "file",
+    }
+
+
+def test_gdal_fsspec_info_dir():
+
+    fs = fsspec.filesystem("gdalvsi")
+    info = fs.info("data")
+    assert (info["mode"] & 16384) != 0
+    del info["mode"]
+    assert info == {
+        "name": "data",
+        "size": 0,
+        "type": "directory",
+    }
+
+
+def test_gdal_fsspec_info_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.info("/i/do/not/exist")
+
+
+def test_gdal_fsspec_ls():
+
+    fs = fsspec.filesystem("gdalvsi")
+    ret = fs.ls("data")
+    assert len(ret) > 2
+    item_of_interest = None
+    for item in ret:
+        if item["name"] == "data/byte.tif":
+            item_of_interest = item
+            break
+    assert item_of_interest
+    assert "mtime" in item_of_interest
+    del item_of_interest["mtime"]
+    assert item_of_interest == {
+        "name": "data/byte.tif",
+        "size": 736,
+        "type": "file",
+    }
+
+
+def test_gdal_fsspec_ls_file():
+
+    fs = fsspec.filesystem("gdalvsi")
+    ret = fs.ls("data/byte.tif")
+    assert ret == ["data/byte.tif"]
+
+
+def test_gdal_fsspec_ls_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.ls("gdalvsi://i/do/not/exist")
+
+
+def test_gdal_fsspec_modified():
+
+    fs = fsspec.filesystem("gdalvsi")
+    modified = fs.modified("data/byte.tif")
+    assert modified is not None
+    import datetime
+
+    assert isinstance(modified, datetime.datetime)
+
+
+def test_gdal_fsspec_modified_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.modified("gdalvsi://i/do/not/exist")
+
+
+def test_gdal_fsspec_rm():
+
+    with fsspec.open("gdalvsi:///vsimem/foo.bin", "wb") as f:
+        f.write(b"""bar""")
+    fs = fsspec.filesystem("gdalvsi")
+    fs.info("/vsimem/foo.bin")
+    fs.rm("/vsimem/foo.bin")
+    with pytest.raises(FileNotFoundError):
+        fs.info("/vsimem/foo.bin")
+
+
+def test_gdal_fsspec_rm_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.rm("/vsimem/foo.bin")
+
+
+def test_gdal_fsspec_copy():
+
+    with fsspec.open("gdalvsi:///vsimem/foo.bin", "wb") as f:
+        f.write(b"""bar""")
+    fs = fsspec.filesystem("gdalvsi")
+    fs.copy("/vsimem/foo.bin", "/vsimem/bar.bin")
+    assert fs.info("/vsimem/bar.bin")["size"] == 3
+    assert fs.info("/vsimem/foo.bin")["size"] == 3
+    fs.rm("/vsimem/foo.bin")
+    fs.rm("/vsimem/bar.bin")
+
+
+def test_gdal_fsspec_copy_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.copy("/vsimem/foo.bin", "/vsimem/bar.bin")
+
+
+def test_gdal_fsspec_mv():
+
+    with fsspec.open("gdalvsi:///vsimem/foo.bin", "wb") as f:
+        f.write(b"""bar""")
+    fs = fsspec.filesystem("gdalvsi")
+    fs.mv("/vsimem/foo.bin", "/vsimem/bar.bin")
+    assert fs.info("/vsimem/bar.bin")["size"] == 3
+    with pytest.raises(FileNotFoundError):
+        fs.info("/vsimem/foo.bin")
+    fs.rm("/vsimem/bar.bin")
+
+
+def test_gdal_fsspec_mv_error():
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(FileNotFoundError):
+        fs.mv("/vsimem/foo.bin", "/bar.bin")
+
+
+def test_gdal_fsspec_mkdir(tmp_path):
+
+    fs = fsspec.filesystem("gdalvsi")
+
+    my_path = str(tmp_path) + "/my_dir"
+
+    fs.mkdir(my_path)
+    assert fs.info(my_path)["type"] == "directory"
+    with pytest.raises(FileExistsError):
+        fs.mkdir(my_path)
+    fs.rmdir(my_path)
+
+    fs.mkdir(my_path + "/my_subdir")
+    assert fs.info(my_path)["type"] == "directory"
+    assert fs.info(my_path + "/my_subdir")["type"] == "directory"
+    fs.rmdir(my_path + "/my_subdir")
+    fs.rmdir(my_path)
+    with pytest.raises(FileNotFoundError):
+        fs.info(my_path)
+
+    fs = fsspec.filesystem("gdalvsi")
+    with pytest.raises(Exception):
+        fs.mkdir(my_path + "/my_subdir", create_parents=False)
+    with pytest.raises(FileNotFoundError):
+        fs.info(my_path)
+
+
+def test_gdal_fsspec_makedirs(tmp_path):
+
+    fs = fsspec.filesystem("gdalvsi")
+
+    my_path = str(tmp_path) + "/my_dir"
+    fs.makedirs(my_path)
+    assert fs.info(my_path)["type"] == "directory"
+    with pytest.raises(FileExistsError):
+        fs.makedirs(my_path)
+    fs.makedirs(my_path, exist_ok=True)
+    fs.rmdir(my_path)
+
+
+def test_gdal_fsspec_usable_by_pyarrow_dataset(tmp_vsimem):
+
+    ds = pytest.importorskip("pyarrow.dataset")
+
+    tmp_vsimem_file = str(tmp_vsimem / "tmp.parquet")
+    gdal.FileFromMemBuffer(
+        tmp_vsimem_file, open("../ogr/data/parquet/test.parquet", "rb").read()
+    )
+
+    fs_vsimem = fsspec.filesystem("gdalvsi")
+
+    assert ds.dataset(tmp_vsimem_file, filesystem=fs_vsimem) is not None
+
+    assert ds.dataset(str(tmp_vsimem), filesystem=fs_vsimem) is not None

autotest/pymod/gdaltest.py

@@ -2102,87 +2102,8 @@ def reopen(ds, update=False, open_options=None):
     )
 
 
-# VSIFile helper class
-
-
-class VSIFile:
-    def __init__(self, path, mode, encoding="utf-8"):
-        self._path = path
-        self._mode = mode
-
-        self._binary = "b" in mode
-        self._encoding = encoding
-
-        self._fp = gdal.VSIFOpenExL(self._path, self._mode, True)
-        if self._fp is None:
-            raise OSError(gdal.VSIGetLastErrorMsg())
-
-        self._closed = False
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, *args):
-        self.close()
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        line = gdal.CPLReadLineL(self._fp)
-        if line is None:
-            raise StopIteration
-        if self._binary:
-            return line.encode()
-        return line
-
-    def close(self):
-        if self._closed:
-            return
-
-        self._closed = True
-        gdal.VSIFCloseL(self._fp)
-
-    def read(self, size=-1):
-        if size == -1:
-            pos = self.tell()
-            self.seek(0, 2)
-            size = self.tell()
-            self.seek(pos)
-
-        raw = gdal.VSIFReadL(1, size, self._fp)
-
-        if self._binary:
-            return bytes(raw)
-        else:
-            return raw.decode(self._encoding)
-
-    def write(self, x):
-
-        if self._binary:
-            assert type(x) in (bytes, bytearray, memoryview)
-        else:
-            assert type(x) is str
-            x = x.encode(self._encoding)
-
-        planned_write = len(x)
-        actual_write = gdal.VSIFWriteL(x, 1, planned_write, self._fp)
-
-        if planned_write != actual_write:
-            raise OSError(
-                f"Expected to write {planned_write} bytes but {actual_write} were written"
-            )
-
-    def seek(self, offset, whence=0):
-        if gdal.VSIFSeekL(self._fp, offset, whence) != 0:
-            raise OSError(gdal.VSIGetLastErrorMsg())
-
-    def tell(self):
-        return gdal.VSIFTellL(self._fp)
-
-
 def vsi_open(path, mode="r"):
-    return VSIFile(path, mode)
+    return gdal.VSIFile(path, mode)
 
 
 def vrt_has_open_support():

doc/requirements.txt

@@ -1,5 +1,6 @@
 # This file may be used to create an environment using:
 # $ pip install --upgrade -r <this file>
+fsspec
 numpy
 sphinx
 breathe

doc/source/api/python/general.rst

@@ -95,6 +95,26 @@ Error Handling
 File Management
 ---------------
 
+osgeo.gdal_fsspec module
+++++++++++++++++++++++++
+
+.. automodule:: osgeo.gdal_fsspec
+   :members:
+   :undoc-members:
+   :show-inheritance:
+   :noindex:
+
+osgeo.gdal.VSIFile class
+++++++++++++++++++++++++
+
+.. autoclass:: osgeo.gdal.VSIFile
+   :members:
+   :undoc-members:
+   :noindex:
+
+Low level functions
++++++++++++++++++++
+
 .. autofunction:: osgeo.gdal.CloseDir
 
 .. autofunction:: osgeo.gdal.CopyFile