add healthcheck endpoint and startup check

packages/backend/src/main.rs

@@ -1,8 +1,10 @@
 use actix_web::{
     middleware::{self, Logger},
-    web, App, HttpServer,
+    web::{self},
+    App, HttpServer,
 };
 use dotenv::dotenv;
+use log::error;
 
 #[macro_use]
 extern crate lazy_static;
@@ -10,6 +12,7 @@ extern crate lazy_static;
 mod api;
 mod client;
 mod config;
+mod health;
 mod note;
 mod size;
 mod status;
@@ -20,6 +23,11 @@ async fn main() -> std::io::Result<()> {
     dotenv().ok();
     env_logger::init_from_env(env_logger::Env::new().default_filter_or(config::VERBOSITY.as_str()));
 
+    if !store::can_reach_redis() {
+        error!("cannot reach redis");
+        panic!("canont reach redis");
+    }
+
     return HttpServer::new(|| {
         App::new()
             .wrap(Logger::new("\"%r\" %s %b %T"))