new error responder

server/src/err.rs

@@ -0,0 +1,32 @@
+use std::{error, fmt};
+use rocket::response::{self, Responder, Response};
+use rocket::http::Status;
+use rocket::request::Request;
+
+
+#[derive(Debug, Clone)]
+pub struct DbResponse {
+    err_msg: &'static str
+}
+
+pub type DbError<T, DbErr> = std::result::Result<T, DbErr>;
+
+
+impl fmt::Display for DbResponse {
+    fn fmt(&self, f:&mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Database error")
+    }
+}
+impl error::Error for DbResponse {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+        None
+    }
+}
+impl<'r> Responder<'r> for DbResponse {
+    fn respond_to(self, _:&Request) -> response::Result<'r> {
+        Response::build()
+            .status(Status::InternalServerError)
+            .raw_header("db-error", self.err_msg)
+            .ok()
+    }
+}