[GitHub] [iceberg] rdblue commented on a diff in pull request #5332: [Python] FsspecFileIO, a FileIO that wraps any fsspec compliant filesystem

[GitBox <gi...@apache.org>]

rdblue commented on code in PR #5332:
URL: https://github.com/apache/iceberg/pull/5332#discussion_r956252481


##########
python/pyiceberg/io/fsspec.py:
##########
@@ -0,0 +1,182 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""FileIO implementation for reading and writing table files that uses fsspec compatible filesystems"""
+
+from typing import Dict, Union
+from urllib.parse import urlparse
+
+from pyiceberg.io import FileIO, InputFile, OutputFile
+from pyiceberg.typedef import EMPTY_DICT
+
+
+class FsspecInputFile(InputFile):
+    """An input file implementation for the FsspecFileIO
+
+    Args:
+        location(str): A URI to a file location
+        fs: An fsspec filesystem instance
+    """
+
+    def __init__(self, location: str, fs):
+        self._fs = fs
+        super().__init__(location=location)
+
+    def __len__(self) -> int:
+        """Returns the total length of the file, in bytes"""
+        object_info = self._fs.info(self.location)
+        if size := object_info.get("Size"):
+            return size
+        elif size := object_info.get("size"):
+            return size
+        raise RuntimeError(f"Cannot retrieve object info: {self.location}")
+
+    def exists(self) -> bool:
+        """Checks whether the location exists"""
+        return self._fs.lexists(self.location)
+
+    def open(self):
+        """Create an input stream for reading the contents of the file
+
+        Returns:
+            OpenFile: An fsspec compliant file-like object
+        """
+        return self._fs.open(self.location, "rb")
+
+
+class FsspecOutputFile(OutputFile):
+    """An output file implementation for the FsspecFileIO
+
+    Args:
+        location(str): A URI to a file location
+        fs: An fsspec filesystem instance
+    """
+
+    def __init__(self, location: str, fs):
+        self._fs = fs
+        super().__init__(location=location)
+
+    def __len__(self) -> int:
+        """Returns the total length of the file, in bytes"""
+        object_info = self._fs.info(self.location)
+        if size := object_info.get("Size"):
+            return size
+        elif size := object_info.get("size"):
+            return size
+        raise RuntimeError(f"Cannot retrieve object info: {self.location}")
+
+    def exists(self) -> bool:
+        """Checks whether the location exists"""
+        return self._fs.lexists(self.location)
+
+    def create(self, overwrite: bool = False):
+        """Create an output stream for reading the contents of the file
+
+        Args:
+            overwrite(bool): Whether to overwrite the file if it already exists
+
+        Returns:
+            OpenFile: An fsspec compliant file-like object
+
+        Raises:
+            FileExistsError: If the file already exists at the location and overwrite is set to False
+
+        Note:
+            If overwrite is set to False, a check is first performed to verify that the file does not exist.
+            This is not thread-safe and a possibility does exist that the file can be created by a concurrent
+            process after the existence check yet before the output stream is created. In such a case, the default
+            behavior will truncate the contents of the existing file when opening the output stream.
+        """
+        if not overwrite and self.exists():
+            raise FileExistsError(f"Cannot create file, file already exists: {self.location}")
+        self._fs.touch(self.location)

Review Comment:
   Why is this needed?



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