uranusjr commented on code in PR #34729: URL: https://github.com/apache/airflow/pull/34729#discussion_r1363060858
########## airflow/io/__init__.py: ########## @@ -0,0 +1,270 @@ +# 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. +"""Base FileIO classes for implementing reading and writing table files. + +The FileIO abstraction includes a subset of full filesystem implementations. Specifically, +Iceberg needs to read or write a file at a given location (as a seekable stream), as well +as check if a file exists. An implementation of the FileIO abstract base class is responsible +for returning an InputFile instance, an OutputFile instance, and deleting a file given +its location. + +Ported from Apache Iceberg. +""" +from __future__ import annotations + +import importlib +import logging +from abc import ABC, abstractmethod +from io import SEEK_SET +from types import TracebackType +from typing import ( + Dict, + Optional, + Protocol, + runtime_checkable, +) + +log = logging.getLogger(__name__) + +HDFS_HOST = "hdfs.host" +HDFS_PORT = "hdfs.port" +HDFS_USER = "hdfs.user" +HDFS_KERB_TICKET = "hdfs.kerberos_ticket" + +TOKEN = "token" + +Properties = Dict[str, Optional[str]] + + +@runtime_checkable +class InputStream(Protocol): + """A protocol for the file-like object returned by InputFile.open(...). + + This outlines the minimally required methods for a seekable input stream returned from an InputFile + implementation's `open(...)` method. These methods are a subset of IOBase/RawIOBase. + """ + + @abstractmethod + def read(self, size: int = 0) -> bytes: + ... + + @abstractmethod + def seek(self, offset: int, whence: int = SEEK_SET) -> int: + ... + + @abstractmethod + def tell(self) -> int: + ... + + @abstractmethod + def close(self) -> None: + ... + + def __enter__(self) -> InputStream: + """Provide setup when opening an InputStream using a 'with' statement.""" + + @abstractmethod + def __exit__( + self, + exctype: type[BaseException] | None, + excinst: BaseException | None, + exctb: TracebackType | None, + ) -> None: + """Perform cleanup when exiting the scope of a 'with' statement.""" + + +@runtime_checkable +class OutputStream(Protocol): # pragma: no cover + """A protocol for the file-like object returned by OutputFile.create(...). + + This outlines the minimally required methods for a writable output stream returned from an OutputFile + implementation's `create(...)` method. These methods are a subset of IOBase/RawIOBase. + """ + + @abstractmethod + def write(self, b: bytes) -> int: + ... + + @abstractmethod + def close(self) -> None: + ... + + @abstractmethod + def __enter__(self) -> OutputStream: + """Provide setup when opening an OutputStream using a 'with' statement.""" + + @abstractmethod + def __exit__( + self, + exctype: type[BaseException] | None, + excinst: BaseException | None, + exctb: TracebackType | None, + ) -> None: + """Perform cleanup when exiting the scope of a 'with' statement.""" + + +class InputFile(ABC): + """A base class for InputFile implementations. + + Args: + location (str): A URI or a path to a local file. + + Attributes: + location (str): The URI or path to a local file for an InputFile instance. + exists (bool): Whether the file exists or not. + """ + + def __init__(self, location: str): + self._location = location + + @abstractmethod + def __len__(self) -> int: + """Return the total length of the file, in bytes.""" + + @property + def location(self) -> str: + """The fully-qualified location of the input file.""" + return self._location + + @abstractmethod + def exists(self) -> bool: + """Check whether the location exists. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + """ + + @abstractmethod + def open(self, seekable: bool = True) -> InputStream: + """Return an object that matches the InputStream protocol. + + Args: + seekable: If the stream should support seek, or if it is consumed sequential. + + Returns: + InputStream: An object that matches the InputStream protocol. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + FileNotFoundError: If the file at self.location does not exist. + """ + + +class OutputFile(ABC): + """A base class for OutputFile implementations. + + Args: + location (str): A URI or a path to a local file. + + Attributes: + location (str): The URI or path to a local file for an OutputFile instance. + exists (bool): Whether the file exists or not. + """ + + def __init__(self, location: str): + self._location = location + + @abstractmethod + def __len__(self) -> int: + """Return the total length of the file, in bytes.""" + + @property + def location(self) -> str: + """The fully-qualified location of the output file.""" + return self._location + + @abstractmethod + def exists(self) -> bool: + """Check whether the location exists. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + """ + + @abstractmethod + def to_input_file(self) -> InputFile: + """Return an InputFile for the location of this output file.""" + + @abstractmethod + def create(self, overwrite: bool = False) -> OutputStream: + """Return an object that matches the OutputStream protocol. + + Args: + overwrite (bool): If the file already exists at `self.location` + and `overwrite` is False a FileExistsError should be raised. + + Returns: + OutputStream: An object that matches the OutputStream protocol. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + FileExistsError: If the file at self.location already exists and `overwrite=False`. + """ + + +class FileIO(ABC): + """A base class for FileIO implementations.""" + + @abstractmethod + def new_input(self, location: str, conn_id: str | None) -> InputFile: + """Get an InputFile instance to read bytes from the file at the given location. + + Args: + location (str): A URI or a path to a local file. + conn_id (str): The connection ID to use when getting the file. + """ + + @abstractmethod + def new_output(self, location: str, conn_id: str | None) -> OutputFile: + """Get an OutputFile instance to write bytes to the file at the given location. + + Args: + location (str): A URI or a path to a local file. + conn_id (str): The connection ID to use when getting the file. + """ + + @abstractmethod + def delete(self, location: str | InputFile | OutputFile, conn_id: str | None) -> None: + """Delete the file at the given path. + + Args: + location (Union[str, InputFile, OutputFile]): A URI or a path to a local file--if an InputFile + instance or an OutputFile instance is provided, the location attribute for that instance is + used as the URI to delete. + conn_id (str): The connection ID to use when deleting the file. + + Raises: + PermissionError: If the file at location cannot be accessed due to a permission error. + FileNotFoundError: When the file at the provided location does not exist. + """ + + +FSSPEC_FILE_IO = "airflow.io.fsspec.FsspecFileIO" + + +def _import_file_io(io_impl: str) -> FileIO | None: Review Comment: Where is this used? I tried to search but couldn’t find anything. ########## airflow/io/__init__.py: ########## @@ -0,0 +1,270 @@ +# 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. +"""Base FileIO classes for implementing reading and writing table files. + +The FileIO abstraction includes a subset of full filesystem implementations. Specifically, +Iceberg needs to read or write a file at a given location (as a seekable stream), as well +as check if a file exists. An implementation of the FileIO abstract base class is responsible +for returning an InputFile instance, an OutputFile instance, and deleting a file given +its location. + +Ported from Apache Iceberg. +""" +from __future__ import annotations + +import importlib +import logging +from abc import ABC, abstractmethod +from io import SEEK_SET +from types import TracebackType +from typing import ( + Dict, + Optional, + Protocol, + runtime_checkable, +) + +log = logging.getLogger(__name__) + +HDFS_HOST = "hdfs.host" +HDFS_PORT = "hdfs.port" +HDFS_USER = "hdfs.user" +HDFS_KERB_TICKET = "hdfs.kerberos_ticket" + +TOKEN = "token" + +Properties = Dict[str, Optional[str]] + + +@runtime_checkable +class InputStream(Protocol): + """A protocol for the file-like object returned by InputFile.open(...). + + This outlines the minimally required methods for a seekable input stream returned from an InputFile + implementation's `open(...)` method. These methods are a subset of IOBase/RawIOBase. + """ + + @abstractmethod + def read(self, size: int = 0) -> bytes: + ... + + @abstractmethod + def seek(self, offset: int, whence: int = SEEK_SET) -> int: + ... + + @abstractmethod + def tell(self) -> int: + ... + + @abstractmethod + def close(self) -> None: + ... + + def __enter__(self) -> InputStream: + """Provide setup when opening an InputStream using a 'with' statement.""" + + @abstractmethod + def __exit__( + self, + exctype: type[BaseException] | None, + excinst: BaseException | None, + exctb: TracebackType | None, + ) -> None: + """Perform cleanup when exiting the scope of a 'with' statement.""" + + +@runtime_checkable +class OutputStream(Protocol): # pragma: no cover + """A protocol for the file-like object returned by OutputFile.create(...). + + This outlines the minimally required methods for a writable output stream returned from an OutputFile + implementation's `create(...)` method. These methods are a subset of IOBase/RawIOBase. + """ + + @abstractmethod + def write(self, b: bytes) -> int: + ... + + @abstractmethod + def close(self) -> None: + ... + + @abstractmethod + def __enter__(self) -> OutputStream: + """Provide setup when opening an OutputStream using a 'with' statement.""" + + @abstractmethod + def __exit__( + self, + exctype: type[BaseException] | None, + excinst: BaseException | None, + exctb: TracebackType | None, + ) -> None: + """Perform cleanup when exiting the scope of a 'with' statement.""" + + +class InputFile(ABC): + """A base class for InputFile implementations. + + Args: + location (str): A URI or a path to a local file. + + Attributes: + location (str): The URI or path to a local file for an InputFile instance. + exists (bool): Whether the file exists or not. + """ + + def __init__(self, location: str): + self._location = location + + @abstractmethod + def __len__(self) -> int: + """Return the total length of the file, in bytes.""" + + @property + def location(self) -> str: + """The fully-qualified location of the input file.""" + return self._location + + @abstractmethod + def exists(self) -> bool: + """Check whether the location exists. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + """ + + @abstractmethod + def open(self, seekable: bool = True) -> InputStream: + """Return an object that matches the InputStream protocol. + + Args: + seekable: If the stream should support seek, or if it is consumed sequential. + + Returns: + InputStream: An object that matches the InputStream protocol. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + FileNotFoundError: If the file at self.location does not exist. + """ + + +class OutputFile(ABC): + """A base class for OutputFile implementations. + + Args: + location (str): A URI or a path to a local file. + + Attributes: + location (str): The URI or path to a local file for an OutputFile instance. + exists (bool): Whether the file exists or not. + """ + + def __init__(self, location: str): + self._location = location + + @abstractmethod + def __len__(self) -> int: + """Return the total length of the file, in bytes.""" + + @property + def location(self) -> str: + """The fully-qualified location of the output file.""" + return self._location + + @abstractmethod + def exists(self) -> bool: + """Check whether the location exists. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + """ + + @abstractmethod + def to_input_file(self) -> InputFile: + """Return an InputFile for the location of this output file.""" + + @abstractmethod + def create(self, overwrite: bool = False) -> OutputStream: + """Return an object that matches the OutputStream protocol. + + Args: + overwrite (bool): If the file already exists at `self.location` + and `overwrite` is False a FileExistsError should be raised. + + Returns: + OutputStream: An object that matches the OutputStream protocol. + + Raises: + PermissionError: If the file at self.location cannot be accessed due to a permission error. + FileExistsError: If the file at self.location already exists and `overwrite=False`. + """ + + +class FileIO(ABC): + """A base class for FileIO implementations.""" + + @abstractmethod + def new_input(self, location: str, conn_id: str | None) -> InputFile: + """Get an InputFile instance to read bytes from the file at the given location. + + Args: + location (str): A URI or a path to a local file. + conn_id (str): The connection ID to use when getting the file. + """ + + @abstractmethod + def new_output(self, location: str, conn_id: str | None) -> OutputFile: + """Get an OutputFile instance to write bytes to the file at the given location. + + Args: + location (str): A URI or a path to a local file. + conn_id (str): The connection ID to use when getting the file. + """ + + @abstractmethod + def delete(self, location: str | InputFile | OutputFile, conn_id: str | None) -> None: + """Delete the file at the given path. + + Args: + location (Union[str, InputFile, OutputFile]): A URI or a path to a local file--if an InputFile + instance or an OutputFile instance is provided, the location attribute for that instance is + used as the URI to delete. + conn_id (str): The connection ID to use when deleting the file. + + Raises: + PermissionError: If the file at location cannot be accessed due to a permission error. + FileNotFoundError: When the file at the provided location does not exist. + """ + + +FSSPEC_FILE_IO = "airflow.io.fsspec.FsspecFileIO" + + +def _import_file_io(io_impl: str) -> FileIO | None: Review Comment: Where is this used? 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