static template context for errors

Cargo.lock

@@ -1455,6 +1455,7 @@ name = "qchgk_web"
 version = "0.2.0"
 dependencies = [
  "chgk_ledb_lib",
+ "lazy_static",
  "mini-moka",
  "rand",
  "rocket",

Cargo.toml

@@ -15,6 +15,7 @@ rocket = { version = "=0.5.0-rc.3", features = ["json"] }
 rocket_dyn_templates = { version = "=0.1.0-rc.3", features = ["tera"] }
 chgk_ledb_lib = {git = "https://gitea.b4tman.ru/b4tman/chgk_ledb.git", rev="699478f85e", package="chgk_ledb_lib", features=["async"]}
 mini-moka = "0.10.0"
+lazy_static = "1.4.0"
 
 [profile.release]
 opt-level = 3

src/main.rs

@@ -14,6 +14,7 @@ use rocket_dyn_templates::Template;
 use rand::distributions::Uniform;
 use rand::Rng;
 
+use lazy_static::lazy_static;
 use std::collections::HashMap;
 use std::ops::Deref;
 use std::sync::Arc;
@@ -26,6 +27,10 @@ use std::time::Duration;
 
 const DB_FILENAME: &str = "db.dat";
 
+lazy_static! {
+    static ref EMPTY_MAP: HashMap<String, String> = HashMap::new();
+}
+
 trait ErrorEmpty {
     type Output;
     fn err_empty(self) -> Result<Self::Output, ()>;
@@ -48,12 +53,10 @@ enum WebError {
 
 impl WebError {
     fn not_found() -> Self {
-        let context: HashMap<String, String> = HashMap::new();
-        WebError::NotFound(Template::render("404", context))
+        WebError::NotFound(Template::render("404", EMPTY_MAP.deref()))
     }
     fn server_error() -> Self {
-        let context: HashMap<String, String> = HashMap::new();
-        WebError::ServerError(Template::render("500", context))
+        WebError::ServerError(Template::render("500", EMPTY_MAP.deref()))
     }
 }