Start rust rewrite

src/db/errors.rs

@@ -0,0 +1,30 @@
+use serde::ser::SerializeStruct;
+use serde::{Serialize, Serializer};
+
+pub enum DatabaseError {
+    InsertError,
+    InsertGetError,
+}
+
+impl Serialize for DatabaseError {
+    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", &500)?;
+        s.serialize_field("description", &String::from(self))?;
+        s.end()
+    }
+}
+
+impl From<&DatabaseError> for String {
+    fn from(err: &DatabaseError) -> Self {
+        match err {
+            DatabaseError::InsertError => String::from("error inserting into database"),
+            DatabaseError::InsertGetError => {
+                String::from("error retrieving new entry from database (your entry was saved)")
+            }
+        }
+    }
+}