feeder rework

feeder-plugin/musicbrainz-feeder/src/main.rs

@@ -0,0 +1,34 @@
+//! `musicbrainz-feeder` — the MusicBrainz identity feeder.
+//!
+//! Serves `fileType:card` for `contentKind:album|artist`. No credential:
+//! MusicBrainz, the Cover Art Archive and ListenBrainz all serve this traffic
+//! unauthenticated, so a freshly deployed feeder answers on its first boot.
+//!
+//! Env:
+//! - `META_FEEDER_HTTP_LISTEN` — listen addr (default `0.0.0.0:8080`)
+//! - `META_FEEDER_STATE_DIR`   — per-plugin cache root (default `/data/meta-feeder`)
+//! - `CARD_TOP_N`, `CARD_DISCOVERY_N` — optional result-sizing seeds
+//! - `RUST_LOG`                — tracing filter (default `info`)
+
+use std::net::SocketAddr;
+
+use meta_feeder_sdk::plugin::FeederPlugin;
+use meta_feeder_sdk::serve_feeders;
+use musicbrainz_feeder::musicbrainz::MusicBrainzCardPlugin;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")))
+        .init();
+
+    let listen: SocketAddr = std::env::var("META_FEEDER_HTTP_LISTEN")
+        .unwrap_or_else(|_| "0.0.0.0:8080".to_string())
+        .parse()?;
+    let state_dir =
+        std::env::var("META_FEEDER_STATE_DIR").unwrap_or_else(|_| "/data/meta-feeder".to_string());
+
+    let plugins: Vec<Box<dyn FeederPlugin>> = vec![Box::new(MusicBrainzCardPlugin::new())];
+    serve_feeders(plugins, state_dir, listen).await
+}