feat: async image conversion service (avif/webp) with backfill

crates/adapters/image-converter/src/lib.rs

@@ -0,0 +1,36 @@
+mod backfill;
+mod config;
+mod handler;
+
+pub use backfill::ConversionBackfillJob;
+pub use config::{ConversionConfig, Format};
+pub use handler::ImageConversionHandler;
+
+use std::sync::Arc;
+use domain::ports::{EventHandler, EventPublisher, ImageRefPort, ImageStorage, PeriodicJob};
+
+pub fn build(
+    image_storage: Arc<dyn ImageStorage>,
+    image_ref: Arc<dyn ImageRefPort>,
+    event_publisher: Arc<dyn EventPublisher>,
+) -> anyhow::Result<Option<(Arc<dyn EventHandler>, Arc<dyn PeriodicJob>)>> {
+    let config = match ConversionConfig::from_env()? {
+        Some(c) => c,
+        None => return Ok(None),
+    };
+
+    let format = config.format;
+
+    let handler = Arc::new(ImageConversionHandler::new(
+        Arc::clone(&image_storage),
+        Arc::clone(&image_ref),
+        format,
+    )) as Arc<dyn EventHandler>;
+
+    let job = Arc::new(ConversionBackfillJob::new(
+        Arc::clone(&image_ref),
+        Arc::clone(&event_publisher),
+    )) as Arc<dyn PeriodicJob>;
+
+    Ok(Some((handler, job)))
+}