Efforts to make ucloud a python package

ucloud/api/common_fields.py

@@ -0,0 +1,53 @@
+import os
+
+from ucloud.config import etcd_client, env_vars
+
+
+class Optional:
+    pass
+
+
+class Field:
+    def __init__(self, _name, _type, _value=None):
+        self.name = _name
+        self.value = _value
+        self.type = _type
+        self.__errors = []
+
+    def validation(self):
+        return True
+
+    def is_valid(self):
+        if self.value == KeyError:
+            self.add_error("'{}' field is a required field".format(self.name))
+        else:
+            if isinstance(self.value, Optional):
+                pass
+            elif not isinstance(self.value, self.type):
+                self.add_error("Incorrect Type for '{}' field".format(self.name))
+            else:
+                self.validation()
+
+        if self.__errors:
+            return False
+        return True
+
+    def get_errors(self):
+        return self.__errors
+
+    def add_error(self, error):
+        self.__errors.append(error)
+
+
+class VmUUIDField(Field):
+    def __init__(self, data):
+        self.uuid = data.get("uuid", KeyError)
+
+        super().__init__("uuid", str, self.uuid)
+
+        self.validation = self.vm_uuid_validation
+
+    def vm_uuid_validation(self):
+        r = etcd_client.get(os.path.join(env_vars.get('VM_PREFIX'), self.uuid))
+        if not r:
+            self.add_error("VM with uuid {} does not exists".format(self.uuid))