add dev resources; plumb GUI_ENV_FILE/API_ENV_FILE/API_DESI_DATA into run targets

api/src/main.rs

@@ -1,4 +1,7 @@
-use desi_explorer_api::{config, routes};
+use std::path::Path;
+use std::sync::Arc;
+
+use desi_explorer_api::{config, routes, store};
 
 use tracing_subscriber::EnvFilter;
 
@@ -11,8 +14,22 @@ async fn main() -> anyhow::Result<()> {
         )
         .init();
 
+    load_env_file()?;
+
     let config = config::Config::from_env()?;
-    let app = routes::app();
+
+    let catalog_store = match &config.desi_data {
+        Some(path) => {
+            tracing::info!(path = %path.display(), "loading DESI data");
+            store::CatalogStore::load(Path::new(path))?
+        }
+        None => {
+            tracing::warn!("API_DESI_DATA not set, serving placeholder catalogs");
+            store::CatalogStore::placeholder()
+        }
+    };
+
+    let app = routes::app_with_state(Arc::new(catalog_store));
 
     let listener = tokio::net::TcpListener::bind(&config.bind_addr).await?;
     tracing::info!("DESI Explorer API listening on {}", config.bind_addr);
@@ -24,6 +41,27 @@ async fn main() -> anyhow::Result<()> {
     Ok(())
 }
 
+/// Loads the env file named by `API_ENV_FILE` (if set) into the process
+/// environment. Existing env vars are not overridden, so values passed
+/// directly on the command line or by the Makefile take precedence.
+fn load_env_file() -> anyhow::Result<()> {
+    let path = std::env::var("API_ENV_FILE").unwrap_or_default();
+    if path.is_empty() {
+        return Ok(());
+    }
+
+    match dotenvy::from_path(&path) {
+        Ok(_) => tracing::info!(%path, "loaded env file"),
+        Err(err) => {
+            return Err(anyhow::anyhow!(
+                "failed to load API_ENV_FILE {path:?}: {err}"
+            ))
+        }
+    }
+
+    Ok(())
+}
+
 async fn shutdown_signal() {
     let _ = tokio::signal::ctrl_c().await;
     tracing::info!("shutting down");