[Core-251] Client: Add Blob.get_or_create method (#12399)

GitOrigin-RevId: 8eaa635aeb54ebce96d437dfee276c9eda7313e9

README.md

@@ -26,6 +26,9 @@ Changelog
 - *Breaking Change*: Derived bands, never supported in the AWS environment and catalog products, have been
   removed.
 - The new `Blob.delete_many` method may be used to delete large numbers of blobs efficiently.
+- The `Blob.get_or_create` method didn't allow supplying `storage_type`, `namespace`, or `name` parameters.
+  Now it works as expected, either returning a saved Blob from the Catalog, or an unsaved blob that
+  you can use to upload and save its data.
 
 ### Compute
 

descarteslabs/core/catalog/blob.py

@@ -396,6 +396,67 @@ def get(
             id = f"{storage_type}/{Blob.namespace_id(namespace)}/{name}"
         return super(cls, Blob).get(id)
 
+    @classmethod
+    def get_or_create(
+        cls,
+        id=None,
+        storage_type=StorageType.DATA,
+        namespace=None,
+        name=None,
+        client=None,
+        **kwargs,
+    ):
+        """Get an existing object from the Descartes Labs catalog or create a new object.
+
+        If the Descartes Labs catalog object is found, and the remainder of the
+        arguments do not differ from the values in the retrieved instance, it will be
+        returned in the `~descarteslabs.catalog.DocumentState.SAVED` state.
+
+        If the Descartes Labs catalog object is found, and the remainder of the
+        arguments update one or more values in the instance, it will be returned in
+        the `~descarteslabs.catalog.DocumentState.MODIFIED` state.
+
+        If the Descartes Labs catalog object is not found, it will be created and the
+        state will be `~descarteslabs.catalog.DocumentState.UNSAVED`.  Also see the
+        example for :py:meth:`save`.
+
+        Parameters
+        ----------
+        id : str, optional
+            The id of the object you are requesting. Required unless ``name`` is supplied.
+            May not be specified if ``name`` is specified.
+        storage_type : StorageType, optional
+            The storage type of the Blob you wish to retrieve. Defaults to ``data``. Ignored
+            unless ``name`` is specified.
+        namespace : str, optional
+            The namespace of the Blob you wish to retrieve. Defaults to the user's org name
+            (if any) plus the unique user hash. Ignored unless ``name`` is specified.
+        name : str, optional
+            The name of the Blob you wish to retrieve. Required if ``id`` is not specified.
+            May not be specified if ``id`` is specified.
+        client : CatalogClient, optional
+            A `CatalogClient` instance to use for requests to the Descartes Labs
+            catalog.  The
+            :py:meth:`~descarteslabs.catalog.CatalogClient.get_default_client` will
+            be used if not set.
+        kwargs : dict, optional
+            With the exception of readonly attributes (`created`, `modified`), any
+            attribute of a catalog object can be set as a keyword argument (Also see
+            `ATTRIBUTES`).
+
+        Returns
+        -------
+        :py:class:`~descarteslabs.catalog.CatalogObject`
+            The requested catalog object that was retrieved or created.
+
+        """
+        if (not id and not name) or (id and name):
+            raise TypeError("Must specify exactly one of id or name parameters")
+        if not id:
+            id = f"{storage_type}/{Blob.namespace_id(namespace)}/{name}"
+
+        return super(cls, Blob).get_or_create(id, client=client, **kwargs)
+
     @classmethod
     def search(cls, client=None, request_params=None):
         """A search query for all blobs.