Add saving periods

src/handlers/errors.rs

@@ -0,0 +1,34 @@
+use serde::ser::SerializeStruct;
+use serde::{Serialize, Serializer};
+
+pub enum HandlerError {
+    BadUidError,
+}
+
+impl HandlerError {
+    fn to_code(&self) -> u32 {
+        match self {
+            HandlerError::BadUidError => 400
+        }
+    }
+}
+
+impl Serialize for HandlerError {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+    {
+        let mut s = serializer.serialize_struct("error", 2)?;
+        s.serialize_field("code", &self.to_code())?;
+        s.serialize_field("description", &String::from(self))?;
+        s.end()
+    }
+}
+
+impl From<&HandlerError> for String {
+    fn from(err: &HandlerError) -> Self {
+        match err {
+            HandlerError::BadUidError => String::from("the uid is in a bad format"),
+        }
+    }
+}