feat(daemon): grab pipeline for wanted movies (#77)

crates/arr-daemon/src/main.rs

@@ -1,6 +1,7 @@
 //! arr — reconcile loop and process entry point. See DESIGN.md §8.
 
 mod config;
+mod grab;
 pub mod reconcile;
 mod web;
 
@@ -12,7 +13,8 @@ use arr_compat::CompatState;
 use arr_db::Db;
 use arr_meta::TmdbClient;
 use config::Config;
-use reconcile::ReconcileLoop;
+use grab::{GrabAction, SeedingLimits};
+use reconcile::{ReconcileLoop, Tick};
 use tower_http::trace::TraceLayer;
 
 /// Dump the `OpenAPI` document and exit, instead of serving. `just gen-client`
@@ -67,6 +69,10 @@ enum Error {
     Migration(#[from] sqlx::migrate::MigrateError),
     #[error("tmdb client: {0}")]
     Tmdb(#[from] arr_meta::Error),
+    #[error("prowlarr client: {0}")]
+    Prowlarr(#[from] arr_indexer::Error),
+    #[error("transmission client: {0}")]
+    Transmission(#[from] arr_dl::Error),
     #[error("bind {addr}: {source}")]
     Bind {
         addr: std::net::SocketAddr,
@@ -82,7 +88,28 @@ async fn run() -> Result<(), Error> {
     let config = Config::load()?;
     let database = Db::connect(&config.database_path).await?;
     database.migrate().await?;
-    let reconcile = ReconcileLoop::new(database.clone());
+
+    let mut reconcile = ReconcileLoop::new(database.clone());
+    // Without a Prowlarr key nothing can be searched, so the grab lane stays
+    // unregistered rather than failing a tick every 30 seconds.
+    if let Some(key) = config.prowlarr_api_key.clone() {
+        let prowlarr = arr_indexer::ProwlarrClient::new(config.prowlarr_url.clone(), key)?;
+        let transmission = arr_dl::TransmissionClient::new(&config.transmission_url)?;
+        reconcile = reconcile.register(
+            Tick::Reconcile,
+            GrabAction::new(
+                prowlarr,
+                transmission,
+                config.download_dir.clone(),
+                SeedingLimits {
+                    ratio: config.seed_ratio_limit,
+                    idle_minutes: config.seed_idle_limit_minutes,
+                },
+            ),
+        );
+    } else {
+        tracing::warn!("no Prowlarr API key: nothing will be grabbed");
+    }
 
     // Jellyseerr's Radarr shim (DESIGN.md §9.4) reads the same database and
     // needs its own TMDB client for `movie/lookup`.