Support az filter for snapshot

Sometimes if users want to create volumes from snapshots
with a specified availability_zone, users may want to know
what snapshots are available. In this case, users always
want to filter the snapshots with "availability_zone" first.

This patch added the availability_zone filter for snapshot list.

Change-Id: I8953eca5f535c1399dc882c4a232fbeef9bb2959

cinder/db/sqlalchemy/api.py

@@ -2983,9 +2983,9 @@ def snapshot_get_all(context, filters=None, marker=None, limit=None,
                       paired with corresponding item in sort_keys
     :returns: list of matching snapshots
     """
-    if filters and not is_valid_model_filters(models.Snapshot, filters,
-                                              exclude_list=('host',
-                                                            'cluster_name')):
+    if filters and not is_valid_model_filters(
+            models.Snapshot, filters,
+            exclude_list=('host', 'cluster_name', 'availability_zone')):
         return []
 
     session = get_session()
@@ -3011,7 +3011,7 @@ def _process_snaps_filters(query, filters):
     if filters:
         filters = filters.copy()
 
-        exclude_list = ('host', 'cluster_name')
+        exclude_list = ('host', 'cluster_name', 'availability_zone')
 
         # Ensure that filters' keys exist on the model or is metadata
         for key in filters.keys():
@@ -3043,13 +3043,16 @@ def _process_snaps_filters(query, filters):
         # filter handling for host and cluster name
         host = filters.pop('host', None)
         cluster = filters.pop('cluster_name', None)
-        if host or cluster:
+        az = filters.pop('availability_zone', None)
+        if host or cluster or az:
             query = query.join(models.Snapshot.volume)
         vol_field = models.Volume
         if host:
             query = query.filter(_filter_host(vol_field.host, host))
         if cluster:
             query = query.filter(_filter_host(vol_field.cluster_name, cluster))
+        if az:
+            query = query.filter_by(availability_zone=az)
 
         filters_dict = {}
         LOG.debug("Building query based on filter")
@@ -3162,7 +3165,8 @@ def snapshot_get_all_by_project(context, project_id, filters=None, marker=None,
     :returns: list of matching snapshots
     """
     if filters and not is_valid_model_filters(
-            models.Snapshot, filters, exclude_list=('host', 'cluster_name')):
+            models.Snapshot, filters,
+            exclude_list=('host', 'cluster_name', 'availability_zone')):
         return []
 
     authorize_project_context(context, project_id)

cinder/tests/unit/api/test_common.py

@@ -466,7 +466,8 @@ class GeneralFiltersTest(test.TestCase):
               {'resource': 'backup',
                'expected': ["name", "status", "volume_id"]},
               {'resource': 'snapshot',
-               'expected': ["name", "status", "volume_id", "metadata"]},
+               'expected': ["name", "status", "volume_id", "metadata",
+                            "availability_zone"]},
               {'resource': 'group_snapshot',
                'expected': ["status", "group_id"]},
               {'resource': 'attachment',

cinder/tests/unit/api/v3/test_snapshots.py

@@ -126,18 +126,25 @@ class SnapshotApiTest(test.TestCase):
         body = {"snapshot": snap}
         self.controller.create(req, body)
 
-    @ddt.data(('host', 'test_host1'), ('cluster_name', 'cluster1'))
+    @ddt.data(('host', 'test_host1', True), ('cluster_name', 'cluster1', True),
+              ('availability_zone', 'nova1', False))
     @ddt.unpack
-    def test_snapshot_list_with_filter(self, filter_name, filter_value):
+    def test_snapshot_list_with_filter(self, filter_name, filter_value,
+                                       is_admin_user):
         volume1 = test_utils.create_volume(self.ctx, host='test_host1',
-                                           cluster_name='cluster1')
+                                           cluster_name='cluster1',
+                                           availability_zone='nova1')
         volume2 = test_utils.create_volume(self.ctx, host='test_host2',
-                                           cluster_name='cluster2')
+                                           cluster_name='cluster2',
+                                           availability_zone='nova2')
         snapshot1 = test_utils.create_snapshot(self.ctx, volume1.id)
-        snapshot2 = test_utils.create_snapshot(self.ctx, volume2.id)  # noqa
+        test_utils.create_snapshot(self.ctx, volume2.id)
 
         url = '/v3/snapshots?%s=%s' % (filter_name, filter_value)
-        req = fakes.HTTPRequest.blank(url, use_admin_context=True)
+        # Generic filtering is introduced since '3,31' and we add
+        # 'availability_zone' support by using generic filtering.
+        req = fakes.HTTPRequest.blank(url, use_admin_context=is_admin_user,
+                                      version='3.31')
         res_dict = self.controller.detail(req)
 
         self.assertEqual(1, len(res_dict['snapshots']))

doc/source/man/generalized_filters.rst

@@ -58,7 +58,8 @@ valid for first. The supported APIs are marked with "*" below in the table.
 |                 | size, description, replication_status, multiattach                      |
 +-----------------+-------------------------------------------------------------------------+
 |                 | id, volume_id, user_id, project_id, status, volume_size, name,          |
-| list snapshot*  | description, volume_type_id, group_snapshot_id, metadata                |
+| list snapshot*  | description, volume_type_id, group_snapshot_id, metadata,               |
+|                 | availability_zone                                                       |
 +-----------------+-------------------------------------------------------------------------+
 |                 | id, name, status, container, availability_zone, description,            |
 | list backup*    | volume_id, is_incremental, size, host, parent_id                        |

etc/cinder/resource_filters.json

@@ -3,7 +3,8 @@
                "bootable", "migration_status", "availability_zone",
                "group_id"],
     "backup": ["name", "status", "volume_id"],
-    "snapshot": ["name", "status", "volume_id", "metadata"],
+    "snapshot": ["name", "status", "volume_id", "metadata",
+                 "availability_zone"],
     "group": [],
     "group_snapshot": ["status", "group_id"],
     "attachment": ["volume_id", "status", "instance_id", "attach_status"],

releasenotes/notes/add-availability_zone-filter-for-snapshot-8e1494212276abde.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Added availability_zone filter for snapshots list.