DynamoDBStreams: DescribeStream response deserialization error

[pelegkaz]

Hi,

I'm using moto as a testcontainer with a golang sdk client in order to mock dynamodbstreams.
When calling DescribeStream, I get error deserializing CreationRequestDateTime.

operation error DynamoDB Streams: DescribeStream, https response error StatusCode: 200, RequestID: eNgJwGwokhpIul3c2cEJcocZj8maXMu83f4kF1d1OnwNs4m4jTBc, deserialization failed, failed to decode response body, expected Date to be a JSON Number, got string instead.

when debugging I see it happens here:

		case "CreationRequestDateTime":
			if value != nil {
				switch jtv := value.(type) {
				case json.Number:
					f64, err := jtv.Float64()
					if err != nil {
						return err
					}
					sv.CreationRequestDateTime = ptr.Time(smithytime.ParseEpochSeconds(f64))
				default:
					return fmt.Errorf("expected Date to be a JSON Number, got %T instead", value)
				}
			}

I think the fix is simply to change the formatting:

@@ -89,7 +90,7 @@ class DynamoDBStreamsBackend(BaseBackend):
                     "ENABLED" if table.latest_stream_label else "DISABLED"
                 ),
                 "StreamViewType": table.stream_specification["StreamViewType"],  # type: ignore[index]
-                "CreationRequestDateTime": table.stream_shard.created_on.isoformat(),  # type: ignore[union-attr]
+                "CreationRequestDateTime": unix_time(table.stream_shard.created_on),  # type: ignore[union-attr]

Thanks!