Set up a global maps (cache) object

Cargo.lock

@@ -1599,6 +1599,7 @@ dependencies = [
  "chrono",
  "color-eyre",
  "geocoding",
+ "once_cell",
  "rocket",
 ]
 

Cargo.toml

@@ -7,4 +7,5 @@ edition = "2021"
 chrono = "0.4.19"
 color-eyre = "0.5.6"
 geocoding = "0.3.1"
+once_cell = "1.9.0"
 rocket = { version = "0.5.0-rc.1", features = ["json"] }

src/main.rs

@@ -13,8 +13,10 @@
 
 use color_eyre::Result;
 use geocoding::{Forward, Openstreetmap, Point};
+use once_cell::sync::Lazy;
 use rocket::serde::json::Json;
 use rocket::serde::Serialize;
+use rocket::tokio::sync::Mutex;
 use rocket::tokio::{self, select};
 use rocket::{get, routes, FromFormField};
 
@@ -22,6 +24,8 @@ use self::maps::Maps;
 
 mod maps;
 
+static MAPS: Lazy<Mutex<Maps>> = Lazy::new(|| Mutex::new(Maps::default()));
+
 /// The current for a specific location.
 ///
 /// Only the metrics asked for are included as well as the position and current time.

src/maps.rs

@@ -2,6 +2,8 @@
 
 use rocket::tokio::time::{sleep, Duration};
 
+use crate::MAPS;
+
 /// The interval between map refreshes (in seconds).
 const SLEEP_INTERVAL: u64 = 60;
 
@@ -11,6 +13,8 @@ pub(crate) struct Maps;
 impl Maps {
     pub(crate) async fn run() -> ! {
         loop {
+            let _maps = MAPS.lock().await;
+
             sleep(Duration::from_secs(SLEEP_INTERVAL)).await;
         }
     }