Use eyre

src/main.rs

@@ -3,10 +3,10 @@ mod routes;
 
 use clap::Parser;
 use dotenv::dotenv;
+use eyre::Context;
 use health::HealthState;
 use rocket::fs::FileServer;
 use rocket_dyn_templates::Template;
-use std::io;
 use std::path::PathBuf;
 use std::sync::Arc;
 use std::time::Duration;
@@ -20,14 +20,16 @@ struct Opt {
 }
 
 #[rocket::main]
-async fn main() -> io::Result<()> {
+async fn main() -> eyre::Result<()> {
     dotenv().ok();
     let opt = Opt::parse();
+    color_eyre::install()?;
 
     let config = fs::read_to_string(&opt.config)
         .await
-        .expect("failed to read config file");
-    let config = ron::from_str(&config).expect("failed to parse config file");
+        .wrap_err_with(|| format!("failed to read config file: {:?}", opt.config))?;
+    let config = ron::from_str(&config)
+        .wrap_err_with(|| format!("failed to parse config file: {:?}", opt.config))?;
     let state = Arc::new(HealthState::new(config));
 
     let rocket = rocket::build()
@@ -38,7 +40,7 @@ async fn main() -> io::Result<()> {
 
     start_poller(state);
 
-    rocket.launch().await.expect("rocket failed to launch");
+    rocket.launch().await.wrap_err("rocket failed to launch")?;
 
     Ok(())
 }