models became serializable

interface/image/Image.py

+import json
+
+
 class Image:
     def __init__(self, id, name, format) -> None:
         super().__init__()
@@ -5,3 +8,12 @@ class Image:
         self.id = id
         self.name = name
         self.format = format
+
+    def to_json(self):
+        return json.dumps(self.__dict__)
+
+    def __repr__(self):
+        return self.to_json()
+
+    def __str__(self) -> str:
+        return self.to_json()

interface/storage/Snapshot.py

+import json
+
+
 class Snapshot:
     def __init__(self, id, size) -> None:
         super().__init__()
 
         self.id = id
         self.size = size
+
+    def to_json(self):
+        return json.dumps(self.__dict__)
+
+    def __repr__(self):
+        return self.to_json()
+
+    def __str__(self) -> str:
+        return self.to_json()

interface/storage/Volume.py

+import json
+
+
 class Volume:
     def __init__(self, id, size, bootable) -> None:
         super().__init__()
@@ -5,3 +8,12 @@ class Volume:
         self.id = id
         self.size = size
         self.bootable = bootable
+
+    def to_json(self):
+        return json.dumps(self.__dict__)
+
+    def __repr__(self):
+        return self.to_json()
+
+    def __str__(self) -> str:
+        return self.to_json()