Raise an error on too long string attributes

tests/test_client.py

@@ -446,6 +446,15 @@ def _get_float_array():
         for key in item[item_key]:
             self._compare_item_types(item[item_key][key], response.output.item[key])
 
+        item = {item_key: {"large_string": "a" * 61200}}
+        try:
+            self._client.kv.put(
+                container=self._container, table_path=self._path, key=item_key, attributes=item[item_key]
+            )
+            self.fail("Large string should have raised an exception")
+        except AttributeError:
+            pass
+
     def test_kv(self):
         items = {
             "bob": {"age": 42, "feature": "mustache"},

v3io/dataplane/request.py

@@ -414,17 +414,29 @@ def _to_base64(input):
 
 def _dict_to_typed_attributes(d):
     typed_attributes = {}
-
+    max_string_length = 61199
     for key, value in future.utils.viewitems(d):
         attribute_type = type(value)
         type_value = None
 
         if isinstance(value, future.utils.text_type):
             type_key = "S"
             type_value = value
+            if len(value) > max_string_length:
+                raise AttributeError(
+                    "Attribute {0} is too long({1} bytes) when max is {2} bytes".format(
+                        key, len(value), max_string_length
+                    )
+                )
         elif isinstance(value, future.utils.string_types):
             type_key = "S"
             type_value = str(value)
+            if len(type_value) > max_string_length:
+                raise AttributeError(
+                    "Attribute {0} is too long({1} bytes) when max is {2} bytes".format(
+                        key, len(value), max_string_length
+                    )
+                )
         elif attribute_type in [int, float]:
             type_key = "N"
             type_value = str(value)