Add a reference section for the built-in feed storage classes

docs/topics/feed-exports.rst

@@ -676,10 +676,11 @@ Default:
         "ftps": "scrapy.extensions.feedexport.FTPFeedStorage",
     }
 
-A dict containing the built-in feed storage backends supported by Scrapy. You
-can disable any of these backends by assigning ``None`` to their URI scheme in
-:setting:`FEED_STORAGES`. E.g., to disable the built-in FTP storage backend
-(without replacement), place this in your ``settings.py``:
+A dict containing the built-in feed storage backends supported by Scrapy, see
+:ref:`feed-storage-classes`. You can disable any of these backends by assigning
+``None`` to their URI scheme in :setting:`FEED_STORAGES`. E.g., to disable the
+built-in FTP storage backend (without replacement), place this in your
+``settings.py``:
 
 .. code-block:: python
 
@@ -840,6 +841,25 @@ source spider in the feed URI:
         scrapy crawl <spider_name> -o "%(spider_name)s.jsonl"
 
 
+.. _feed-storage-classes:
+
+Storage backend classes
+=======================
+
+These are the classes that :setting:`FEED_STORAGES_BASE` assigns to the
+built-in URI schemes.
+
+.. autoclass:: FileFeedStorage
+
+.. autoclass:: FTPFeedStorage
+
+.. autoclass:: GCSFeedStorage
+
+.. autoclass:: S3FeedStorage
+
+.. autoclass:: StdoutFeedStorage
+
+
 .. _URIs: https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
 .. _Amazon S3: https://aws.amazon.com/s3/
 .. _Canned ACL: https://docs.aws.amazon.com/AmazonS3/latest/userguide/acl-overview.html#canned-acl

scrapy/extensions/feedexport.py

@@ -186,6 +186,8 @@ class BlockingFeedStorage(ABC):
 
 
 class StdoutFeedStorage:
+    """:ref:`Standard output <topics-feed-storage-stdout>` storage backend."""
+
     def __init__(
         self,
         uri: str,
@@ -212,6 +214,12 @@ class StdoutFeedStorage:
 
 
 class FileFeedStorage:
+    """:ref:`Local filesystem <topics-feed-storage-fs>` storage backend.
+
+    *uri* may be a ``file://`` URI or a plain path. Missing parent directories
+    are created when the feed is opened.
+    """
+
     def __init__(self, uri: str, *, feed_options: dict[str, Any] | None = None):
         self.path: str = file_uri_to_path(uri) if uri.startswith("file:") else uri
         feed_options = feed_options or {}
@@ -231,6 +239,8 @@ class FileFeedStorage:
 
 
 class S3FeedStorage(BlockingFeedStorage):
+    """:ref:`Amazon S3 <topics-feed-storage-s3>` storage backend."""
+
     def __init__(
         self,
         uri: str,
@@ -325,6 +335,8 @@ class S3FeedStorage(BlockingFeedStorage):
 
 
 class GCSFeedStorage(BlockingFeedStorage):
+    """:ref:`GCS <topics-feed-storage-gcs>` storage backend."""
+
     def __init__(
         self,
         uri: str,
@@ -376,6 +388,9 @@ class GCSFeedStorage(BlockingFeedStorage):
 
 
 class FTPFeedStorage(BlockingFeedStorage):
+    """:ref:`FTP <feed-storage-ftp>` storage backend, which also handles
+    :ref:`FTPS <feed-storage-ftps>` when *uri* uses the ``ftps`` scheme."""
+
     def __init__(
         self,
         uri: str,