return type added

implementation/image/OpenstackImageManager.py

+from typing import Optional
+
 from openstack.exceptions import ResourceNotFound
 
 from interface.image.ImageManager import ImageManager
@@ -12,14 +14,14 @@ class OpenstackImageManager(ImageManager):
         self.openstack = openstack
 
     @staticmethod
-    def os_image_to_rc_image(os_image):
+    def os_image_to_rc_image(os_image) -> Image:
         return Image(
             os_image.id,
             os_image.name,
             os_image.disk_format
         )
 
-    def upload_file(self, name, path, format):
+    def upload_file(self, name, path, format) -> Image:
         os_image = self.openstack.image.create_image(
             name=name,
             filename=path,
@@ -28,7 +30,7 @@ class OpenstackImageManager(ImageManager):
 
         return self.os_image_to_rc_image(os_image)
 
-    def get(self, id):
+    def get(self, id) -> Optional[Image]:
         try:
             os_image = self.openstack.image.get_image(id)
         except ResourceNotFound:
@@ -39,7 +41,7 @@ class OpenstackImageManager(ImageManager):
     def download(self, id):
         return self.openstack.image.download_image(id)
 
-    def delete(self, id):
+    def delete(self, id) -> bool:
         try:
             self.openstack.image.delete_image(id)
         except ResourceNotFound:
@@ -47,7 +49,7 @@ class OpenstackImageManager(ImageManager):
 
         return True
 
-    def list(self):
+    def list(self) -> []:
         images = []
 
         for os_image in self.openstack.image.images():

implementation/storage/OpenstackSnapshotManager.py

+from typing import Optional
+
 from openstack.exceptions import ResourceNotFound
 
 from interface.storage.Snapshot import Snapshot
@@ -12,7 +14,7 @@ class OpenstackSnapshotManager(SnapshotManager):
         self.openstack = os
 
     @staticmethod
-    def os_snapshot_to_rc_snapshot(os_snapshot):
+    def os_snapshot_to_rc_snapshot(os_snapshot) -> Snapshot:
         return Snapshot(
             os_snapshot.id,
             os_snapshot.volume_id,
@@ -21,12 +23,12 @@ class OpenstackSnapshotManager(SnapshotManager):
             os_snapshot.created_at
         )
 
-    def create_from_volume(self, id):
+    def create_from_volume(self, id) -> Snapshot:
         os_snapshot = self.openstack.block_storage.create_snapshot(volume_id=id)
 
         return self.os_snapshot_to_rc_snapshot(os_snapshot)
 
-    def get(self, id):
+    def get(self, id) -> Optional[Snapshot]:
         try:
             os_snapshot = self.openstack.block_storage.get_snapshot(id)
         except ResourceNotFound:
@@ -34,7 +36,7 @@ class OpenstackSnapshotManager(SnapshotManager):
 
         return self.os_snapshot_to_rc_snapshot(os_snapshot)
 
-    def list(self):
+    def list(self) -> []:
         snapshots = []
 
         for os_snapshot in self.openstack.block_storage.snapshots():
@@ -42,7 +44,7 @@ class OpenstackSnapshotManager(SnapshotManager):
 
         return snapshots
 
-    def delete(self, id):
+    def delete(self, id) -> bool:
         try:
             self.openstack.block_storage.delete_snapshot(id)
         except ResourceNotFound:

implementation/storage/OpenstackStorageManager.py

+from typing import Optional
+
 from openstack.exceptions import ResourceNotFound
 
 from interface.storage.StorageManager import StorageManager
@@ -12,7 +14,7 @@ class OpenstackStorageManager(StorageManager):
         self.openstack = openstack
 
     @staticmethod
-    def os_volume_to_rc_volume(os_volume):
+    def os_volume_to_rc_volume(os_volume) -> Volume:
         return Volume(
             os_volume.id,
             os_volume.image_id,
@@ -22,14 +24,14 @@ class OpenstackStorageManager(StorageManager):
             os_volume.created_at
         )
 
-    def create(self, size):
+    def create(self, size) -> Volume:
         os_volume = self.openstack.block_storage.create_volume(
             size=size
         )
 
         return self.os_volume_to_rc_volume(os_volume)
 
-    def create_from_image(self, id, size, bootable):
+    def create_from_image(self, id, size, bootable) -> Volume:
         os_volume = self.openstack.block_storage.create_volume(
             image_id=id,
             size=size,
@@ -38,14 +40,14 @@ class OpenstackStorageManager(StorageManager):
 
         return self.os_volume_to_rc_volume(os_volume)
 
-    def create_from_snapshot(self, id):
+    def create_from_snapshot(self, id) -> Volume:
         os_volume = self.openstack.block_storage.create_volume(
             snapshot_id=id
         )
 
         return self.os_volume_to_rc_volume(os_volume)
 
-    def get(self, id):
+    def get(self, id) -> Optional[Volume]:
         try:
             os_volume = self.openstack.block_storage.get_volume(id)
         except ResourceNotFound:
@@ -61,7 +63,7 @@ class OpenstackStorageManager(StorageManager):
 
         return True
 
-    def extend(self, id, size):
+    def extend(self, id, size) -> bool:
         try:
             self.openstack.block_storage.extend_volume(id, size)
         except ResourceNotFound:
@@ -69,7 +71,7 @@ class OpenstackStorageManager(StorageManager):
 
         return True
 
-    def list(self):
+    def list(self) -> []:
         volumes = []
 
         for os_volume in self.openstack.block_storage.volumes():