feat: add Bucket.reload() and Bucket.update() wrappers to restrict ge…

…neration match args (#153)

Towards #127

google/cloud/storage/bucket.py

@@ -783,6 +783,91 @@ def create(
             timeout=timeout,
         )
 
+    def update(
+        self,
+        client=None,
+        timeout=_DEFAULT_TIMEOUT,
+        if_metageneration_match=None,
+        if_metageneration_not_match=None,
+    ):
+        """Sends all properties in a PUT request.
+
+        Updates the ``_properties`` with the response from the backend.
+
+        If :attr:`user_project` is set, bills the API request to that project.
+
+        :type client: :class:`~google.cloud.storage.client.Client` or
+                      ``NoneType``
+        :param client: the client to use. If not passed, falls back to the
+                       ``client`` stored on the current object.
+
+        :type timeout: float or tuple
+        :param timeout: (Optional) The amount of time, in seconds, to wait
+            for the server response.
+
+            Can also be passed as a tuple (connect_timeout, read_timeout).
+            See :meth:`requests.Session.request` documentation for details.
+
+        :type if_metageneration_match: long
+        :param if_metageneration_match: (Optional) Make the operation conditional on whether the
+                                        blob's current metageneration matches the given value.
+
+        :type if_metageneration_not_match: long
+        :param if_metageneration_not_match: (Optional) Make the operation conditional on whether the
+                                            blob's current metageneration does not match the given value.
+        """
+        super(Bucket, self).update(
+            client=client,
+            timeout=timeout,
+            if_metageneration_match=if_metageneration_match,
+            if_metageneration_not_match=if_metageneration_not_match,
+        )
+
+    def reload(
+        self,
+        client=None,
+        projection="noAcl",
+        timeout=_DEFAULT_TIMEOUT,
+        if_metageneration_match=None,
+        if_metageneration_not_match=None,
+    ):
+        """Reload properties from Cloud Storage.
+
+        If :attr:`user_project` is set, bills the API request to that project.
+
+        :type client: :class:`~google.cloud.storage.client.Client` or
+                      ``NoneType``
+        :param client: the client to use. If not passed, falls back to the
+                       ``client`` stored on the current object.
+
+        :type projection: str
+        :param projection: (Optional) If used, must be 'full' or 'noAcl'.
+                           Defaults to ``'noAcl'``. Specifies the set of
+                           properties to return.
+
+        :type timeout: float or tuple
+        :param timeout: (Optional) The amount of time, in seconds, to wait
+            for the server response.
+
+            Can also be passed as a tuple (connect_timeout, read_timeout).
+            See :meth:`requests.Session.request` documentation for details.
+
+        :type if_metageneration_match: long
+        :param if_metageneration_match: (Optional) Make the operation conditional on whether the
+                                        blob's current metageneration matches the given value.
+
+        :type if_metageneration_not_match: long
+        :param if_metageneration_not_match: (Optional) Make the operation conditional on whether the
+                                            blob's current metageneration does not match the given value.
+        """
+        super(Bucket, self).reload(
+            client=client,
+            projection=projection,
+            timeout=timeout,
+            if_metageneration_match=if_metageneration_match,
+            if_metageneration_not_match=if_metageneration_not_match,
+        )
+
     def patch(
         self,
         client=None,

tests/unit/test_bucket.py

@@ -1184,6 +1184,62 @@ def test_delete_blobs_miss_w_on_error(self):
         self.assertEqual(kw[1]["path"], "/b/%s/o/%s" % (NAME, NONESUCH))
         self.assertEqual(kw[1]["timeout"], self._get_default_timeout())
 
+    def test_reload_bucket_w_metageneration_match(self):
+        NAME = "name"
+        METAGENERATION_NUMBER = 9
+
+        connection = _Connection({})
+        client = _Client(connection)
+        bucket = self._make_one(client=client, name=NAME)
+
+        bucket.reload(if_metageneration_match=METAGENERATION_NUMBER)
+
+        self.assertEqual(len(connection._requested), 1)
+        req = connection._requested[0]
+        self.assertEqual(req["method"], "GET")
+        self.assertEqual(req["path"], "/b/%s" % NAME)
+        self.assertEqual(req["timeout"], self._get_default_timeout())
+        self.assertEqual(
+            req["query_params"],
+            {"projection": "noAcl", "ifMetagenerationMatch": METAGENERATION_NUMBER},
+        )
+
+    def test_reload_bucket_w_generation_match(self):
+        connection = _Connection({})
+        client = _Client(connection)
+        bucket = self._make_one(client=client, name="name")
+
+        with self.assertRaises(TypeError):
+            bucket.reload(if_generation_match=6)
+
+    def test_update_bucket_w_metageneration_match(self):
+        NAME = "name"
+        METAGENERATION_NUMBER = 9
+
+        connection = _Connection({})
+        client = _Client(connection)
+        bucket = self._make_one(client=client, name=NAME)
+
+        bucket.update(if_metageneration_match=METAGENERATION_NUMBER)
+
+        self.assertEqual(len(connection._requested), 1)
+        req = connection._requested[0]
+        self.assertEqual(req["method"], "PUT")
+        self.assertEqual(req["path"], "/b/%s" % NAME)
+        self.assertEqual(req["timeout"], self._get_default_timeout())
+        self.assertEqual(
+            req["query_params"],
+            {"projection": "full", "ifMetagenerationMatch": METAGENERATION_NUMBER},
+        )
+
+    def test_update_bucket_w_generation_match(self):
+        connection = _Connection({})
+        client = _Client(connection)
+        bucket = self._make_one(client=client, name="name")
+
+        with self.assertRaises(TypeError):
+            bucket.update(if_generation_match=6)
+
     @staticmethod
     def _make_blob(bucket_name, blob_name):
         from google.cloud.storage.blob import Blob