refactor: split worker into bootstrap, event_loop, sweep modules

main.rs: 234 → 55 lines, just config + spawn + await.
bootstrap.rs: DI wiring, returns WorkerServices struct.
event_loop.rs: event dispatch with extracted helpers
  (enqueue_cmd, handle_job_completed, drain_one).
sweep.rs: fallback job drainer on interval.

crates/worker/src/bootstrap.rs

@@ -0,0 +1,74 @@
+use std::sync::Arc;
+
+use application::processing::{EnqueueJobHandler, ProcessNextJobHandler};
+use domain::ports::JobRepository;
+
+use crate::config::WorkerConfig;
+use crate::factories::{
+    Repos, build_enqueue_handler, build_plugin_registry, build_process_next_handler,
+};
+
+pub struct WorkerServices {
+    pub process_next: Arc<ProcessNextJobHandler>,
+    pub enqueue: Arc<EnqueueJobHandler>,
+    pub job_repo: Arc<dyn JobRepository>,
+    pub event_consumer:
+        adapters_event_transport::EventConsumerAdapter<adapters_nats::NatsMessageSource>,
+}
+
+pub async fn build(config: &WorkerConfig) -> anyhow::Result<WorkerServices> {
+    let pool = adapters_postgres::connect(&config.database_url).await?;
+    adapters_postgres::run_migrations(&pool).await?;
+
+    let nats_client = async_nats::connect(&config.nats_url).await?;
+    adapters_nats::ensure_stream(&nats_client).await?;
+    tracing::info!(nats_url = %config.nats_url, "NATS connected");
+
+    let event_store: Arc<dyn domain::ports::EventStore> =
+        Arc::new(adapters_postgres::PostgresEventStore::new(pool.clone()));
+    let repos = Repos::new(pool);
+    let file_storage = Arc::new(adapters_storage::LocalFileStorage::new(
+        &config.storage_path,
+    ));
+    let sidecar_writer: Arc<dyn domain::ports::SidecarWriterPort> =
+        Arc::new(adapters_sidecar::XmpSidecarWriter);
+
+    let pub_transport = adapters_nats::NatsTransport::new(nats_client.clone());
+    let nats_publisher: Arc<dyn domain::ports::EventPublisher> = Arc::new(
+        adapters_event_transport::EventPublisherAdapter::new(pub_transport),
+    );
+    let event_pub: Arc<dyn domain::ports::EventPublisher> = Arc::new(
+        adapters_event_transport::CompositeEventPublisher::new(nats_publisher, event_store),
+    );
+
+    let extractor: Arc<dyn domain::ports::MetadataExtractorPort> =
+        Arc::new(adapters_exif::NomExifExtractor);
+    let thumbnail_gen: Arc<dyn domain::ports::ThumbnailGeneratorPort> =
+        Arc::new(adapters_thumbnail::ImageThumbnailGenerator);
+    let registry = Arc::new(build_plugin_registry(
+        &repos,
+        file_storage,
+        sidecar_writer,
+        extractor,
+        thumbnail_gen,
+        event_pub.clone(),
+    ));
+
+    let process_next = Arc::new(build_process_next_handler(
+        &repos,
+        registry,
+        event_pub.clone(),
+    ));
+    let job_repo: Arc<dyn JobRepository> = repos.job.clone();
+    let enqueue = Arc::new(build_enqueue_handler(&repos, event_pub));
+
+    let consumer_source = adapters_nats::NatsMessageSource::new(nats_client);
+    let event_consumer = adapters_event_transport::EventConsumerAdapter::new(consumer_source);
+
+    Ok(WorkerServices {
+        process_next,
+        enqueue,
+        job_repo,
+        event_consumer,
+    })
+}

crates/worker/src/event_loop.rs

@@ -0,0 +1,112 @@
+use std::sync::Arc;
+
+use futures::StreamExt;
+use tokio::sync::watch;
+use tracing::{error, info, warn};
+
+use application::processing::{EnqueueJobCommand, ProcessNextJobCommand, ProcessNextJobHandler};
+use domain::entities::JobType;
+use domain::events::DomainEvent;
+use domain::ports::{EventConsumer, JobRepository};
+use domain::value_objects::{StructuredData, SystemId};
+
+use crate::bootstrap::WorkerServices;
+
+fn enqueue_cmd(job_type: JobType, priority: u32, asset_id: SystemId) -> EnqueueJobCommand {
+    EnqueueJobCommand {
+        job_type,
+        priority,
+        payload: StructuredData::new(),
+        target_asset_id: Some(asset_id),
+        batch_id: None,
+    }
+}
+
+pub async fn run(services: WorkerServices, mut shutdown: watch::Receiver<bool>) {
+    info!("event loop: listening for NATS events");
+    let mut stream = services.event_consumer.consume();
+
+    loop {
+        tokio::select! {
+            _ = shutdown.changed() => {
+                info!("event loop: shutting down");
+                break;
+            }
+            msg = stream.next() => {
+                let Some(result) = msg else { break };
+                let envelope = match result {
+                    Ok(env) => env,
+                    Err(e) => {
+                        error!(error = %e, "event loop: consumer error");
+                        continue;
+                    }
+                };
+
+                (envelope.ack)();
+
+                match &envelope.event {
+                    DomainEvent::AssetIngested { asset_id, .. } => {
+                        info!(asset_id = %asset_id, "AssetIngested → ExtractMetadata");
+                        let cmd = enqueue_cmd(JobType::ExtractMetadata, 10, *asset_id);
+                        if let Err(e) = services.enqueue.execute(cmd).await {
+                            error!(error = %e, "failed to enqueue ExtractMetadata");
+                        }
+                    }
+                    DomainEvent::SidecarSyncRequested { asset_id, .. } => {
+                        info!(asset_id = %asset_id, "SidecarSyncRequested → SyncSidecar");
+                        let cmd = enqueue_cmd(JobType::SyncSidecar, 5, *asset_id);
+                        if let Err(e) = services.enqueue.execute(cmd).await {
+                            error!(error = %e, "failed to enqueue SyncSidecar");
+                        }
+                    }
+                    DomainEvent::JobCompleted { job_id, .. } => {
+                        handle_job_completed(
+                            job_id,
+                            &services.job_repo,
+                            &services.enqueue,
+                        )
+                        .await;
+                    }
+                    DomainEvent::JobEnqueued { job_id, job_type, .. } => {
+                        info!(job_id = %job_id, job_type = %job_type, "JobEnqueued → process");
+                        drain_one(&services.process_next).await;
+                    }
+                    other => {
+                        tracing::debug!(event = ?other, "unhandled event, acked");
+                    }
+                }
+            }
+        }
+    }
+}
+
+async fn handle_job_completed(
+    job_id: &SystemId,
+    job_repo: &Arc<dyn JobRepository>,
+    enqueue: &application::processing::EnqueueJobHandler,
+) {
+    if let Ok(Some(job)) = job_repo.find_by_id(job_id).await
+        && job.job_type == JobType::ExtractMetadata
+        && let Some(asset_id) = job.target_asset_id
+    {
+        info!(asset_id = %asset_id, "ExtractMetadata done → GenerateDerivative");
+        let cmd = enqueue_cmd(JobType::GenerateDerivative, 5, asset_id);
+        if let Err(e) = enqueue.execute(cmd).await {
+            error!(error = %e, "failed to enqueue GenerateDerivative");
+        }
+    }
+}
+
+async fn drain_one(handler: &Arc<ProcessNextJobHandler>) {
+    match handler.execute(ProcessNextJobCommand).await {
+        Ok(Some(job)) => {
+            info!(job_id = %job.job_id, status = ?job.status, "processed job");
+        }
+        Ok(None) => {
+            warn!("JobEnqueued but no queued job found");
+        }
+        Err(e) => {
+            error!(error = %e, "error processing job");
+        }
+    }
+}

crates/worker/src/main.rs

@@ -1,22 +1,15 @@
-use std::sync::Arc;
 use std::time::Duration;
 
-use futures::StreamExt;
 use tokio::sync::watch;
-use tracing::{error, info, warn};
-
-use application::processing::{EnqueueJobCommand, ProcessNextJobCommand};
-use domain::entities::JobType;
-use domain::events::DomainEvent;
-use domain::ports::{EventConsumer, JobRepository};
-use domain::value_objects::StructuredData;
+use tracing::info;
 
+mod bootstrap;
 mod config;
+mod event_loop;
 mod factories;
 mod plugin_registry;
 mod plugins;
-
-use factories::{Repos, build_enqueue_handler, build_plugin_registry, build_process_next_handler};
+mod sweep;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
@@ -29,51 +22,8 @@ async fn main() -> anyhow::Result<()> {
     let config = config::WorkerConfig::from_env();
     info!("Worker starting");
 
-    let pool = adapters_postgres::connect(&config.database_url).await?;
-    adapters_postgres::run_migrations(&pool).await?;
+    let services = bootstrap::build(&config).await?;
 
-    let nats_client = async_nats::connect(&config.nats_url).await?;
-    adapters_nats::ensure_stream(&nats_client).await?;
-    info!(nats_url = %config.nats_url, "NATS connected");
-
-    let event_store: Arc<dyn domain::ports::EventStore> =
-        Arc::new(adapters_postgres::PostgresEventStore::new(pool.clone()));
-    let repos = Repos::new(pool);
-    let file_storage = Arc::new(adapters_storage::LocalFileStorage::new(
-        &config.storage_path,
-    ));
-    let sidecar_writer: Arc<dyn domain::ports::SidecarWriterPort> =
-        Arc::new(adapters_sidecar::XmpSidecarWriter);
-
-    let pub_transport = adapters_nats::NatsTransport::new(nats_client.clone());
-    let nats_publisher: Arc<dyn domain::ports::EventPublisher> = Arc::new(
-        adapters_event_transport::EventPublisherAdapter::new(pub_transport),
-    );
-    let event_pub: Arc<dyn domain::ports::EventPublisher> = Arc::new(
-        adapters_event_transport::CompositeEventPublisher::new(nats_publisher, event_store),
-    );
-
-    let extractor: Arc<dyn domain::ports::MetadataExtractorPort> =
-        Arc::new(adapters_exif::NomExifExtractor);
-    let thumbnail_gen: Arc<dyn domain::ports::ThumbnailGeneratorPort> =
-        Arc::new(adapters_thumbnail::ImageThumbnailGenerator);
-    let registry = Arc::new(build_plugin_registry(
-        &repos,
-        file_storage,
-        sidecar_writer,
-        extractor,
-        thumbnail_gen,
-        event_pub.clone(),
-    ));
-    let process_next = Arc::new(build_process_next_handler(
-        &repos,
-        registry,
-        event_pub.clone(),
-    ));
-    let job_repo: Arc<dyn JobRepository> = repos.job.clone();
-    let enqueue = Arc::new(build_enqueue_handler(&repos, event_pub));
-
-    // ── Shutdown signal ───────────────────────────────────────────────
     let (shutdown_tx, shutdown_rx) = watch::channel(false);
 
     tokio::spawn(async move {
@@ -95,138 +45,14 @@ async fn main() -> anyhow::Result<()> {
         shutdown_tx.send(true).ok();
     });
 
-    // ── Fallback sweep task ────────────────────────────────────────────
     let sweep_interval = Duration::from_secs(config.fallback_sweep_secs);
-    let sweep_handler = Arc::clone(&process_next);
-    let mut sweep_shutdown = shutdown_rx.clone();
-    tokio::spawn(async move {
-        info!(
-            every_secs = config.fallback_sweep_secs,
-            "fallback sweep task started"
-        );
-        loop {
-            tokio::select! {
-                _ = sweep_shutdown.changed() => {
-                    info!("sweep task: shutting down");
-                    break;
-                }
-                _ = tokio::time::sleep(sweep_interval) => {}
-            }
-            info!("fallback sweep: draining queued jobs");
-            loop {
-                match sweep_handler.execute(ProcessNextJobCommand).await {
-                    Ok(Some(job)) => {
-                        info!(job_id = %job.job_id, status = ?job.status, "sweep: processed job");
-                    }
-                    Ok(None) => break,
-                    Err(e) => {
-                        error!(error = %e, "sweep: error processing job");
-                        break;
-                    }
-                }
-            }
-        }
-    });
+    tokio::spawn(sweep::run(
+        services.process_next.clone(),
+        sweep_interval,
+        shutdown_rx.clone(),
+    ));
 
-    // ── Event-driven loop via NATS ─────────────────────────────────────
-    let consumer_source = adapters_nats::NatsMessageSource::new(nats_client);
-    let event_consumer = adapters_event_transport::EventConsumerAdapter::new(consumer_source);
-
-    info!("event loop: listening for NATS events");
-    let mut stream = event_consumer.consume();
-    let mut event_shutdown = shutdown_rx.clone();
-
-    loop {
-        tokio::select! {
-            _ = event_shutdown.changed() => {
-                info!("event loop: shutting down");
-                break;
-            }
-            msg = stream.next() => {
-                let Some(result) = msg else { break };
-                let envelope = match result {
-                    Ok(env) => env,
-                    Err(e) => {
-                        error!(error = %e, "event loop: consumer error");
-                        continue;
-                    }
-                };
-
-                match &envelope.event {
-                    DomainEvent::AssetIngested { asset_id, .. } => {
-                        info!(asset_id = %asset_id, "event loop: AssetIngested → enqueue ExtractMetadata");
-                        (envelope.ack)();
-                        let cmd = EnqueueJobCommand {
-                            job_type: JobType::ExtractMetadata,
-                            priority: 10,
-                            payload: StructuredData::new(),
-                            target_asset_id: Some(*asset_id),
-                            batch_id: None,
-                        };
-                        if let Err(e) = enqueue.execute(cmd).await {
-                            error!(error = %e, "event loop: failed to enqueue ExtractMetadata");
-                        }
-                    }
-                    DomainEvent::SidecarSyncRequested { asset_id, .. } => {
-                        info!(asset_id = %asset_id, "event loop: SidecarSyncRequested → enqueue SyncSidecar");
-                        (envelope.ack)();
-                        let cmd = EnqueueJobCommand {
-                            job_type: JobType::SyncSidecar,
-                            priority: 5,
-                            payload: StructuredData::new(),
-                            target_asset_id: Some(*asset_id),
-                            batch_id: None,
-                        };
-                        if let Err(e) = enqueue.execute(cmd).await {
-                            error!(error = %e, "event loop: failed to enqueue SyncSidecar");
-                        }
-                    }
-                    DomainEvent::JobCompleted { job_id, .. } => {
-                        info!(job_id = %job_id, "event loop: JobCompleted → check derivative generation");
-                        (envelope.ack)();
-                        // Look up the job to see if it was ExtractMetadata
-                        if let Ok(Some(job)) = job_repo.find_by_id(job_id).await
-                            && job.job_type == JobType::ExtractMetadata
-                            && let Some(asset_id) = job.target_asset_id
-                        {
-                            info!(asset_id = %asset_id, "event loop: ExtractMetadata done → enqueue GenerateDerivative");
-                            let cmd = EnqueueJobCommand {
-                                job_type: JobType::GenerateDerivative,
-                                priority: 5,
-                                payload: StructuredData::new(),
-                                target_asset_id: Some(asset_id),
-                                batch_id: None,
-                            };
-                            if let Err(e) = enqueue.execute(cmd).await {
-                                error!(error = %e, "event loop: failed to enqueue GenerateDerivative");
-                            }
-                        }
-                    }
-                    DomainEvent::JobEnqueued {
-                        job_id, job_type, ..
-                    } => {
-                        info!(job_id = %job_id, job_type = %job_type, "event loop: JobEnqueued → process");
-                        (envelope.ack)();
-                        match process_next.execute(ProcessNextJobCommand).await {
-                            Ok(Some(job)) => {
-                                info!(job_id = %job.job_id, status = ?job.status, "event loop: processed job");
-                            }
-                            Ok(None) => {
-                                warn!("event loop: JobEnqueued but no queued job found");
-                            }
-                            Err(e) => {
-                                error!(error = %e, "event loop: error processing job");
-                            }
-                        }
-                    }
-                    other => {
-                        (envelope.ack)();
-                        tracing::debug!(event = ?other, "event loop: unhandled event, acked");
-                    }
-                }
-            }
-        }
-    }
+    event_loop::run(services, shutdown_rx).await;
 
     info!("worker shutdown complete");
     Ok(())

crates/worker/src/sweep.rs

@@ -0,0 +1,37 @@
+use std::sync::Arc;
+use std::time::Duration;
+
+use tokio::sync::watch;
+use tracing::{error, info};
+
+use application::processing::{ProcessNextJobCommand, ProcessNextJobHandler};
+
+pub async fn run(
+    handler: Arc<ProcessNextJobHandler>,
+    interval: Duration,
+    mut shutdown: watch::Receiver<bool>,
+) {
+    info!(every_secs = interval.as_secs(), "sweep task started");
+    loop {
+        tokio::select! {
+            _ = shutdown.changed() => {
+                info!("sweep task: shutting down");
+                break;
+            }
+            _ = tokio::time::sleep(interval) => {}
+        }
+        info!("sweep: draining queued jobs");
+        loop {
+            match handler.execute(ProcessNextJobCommand).await {
+                Ok(Some(job)) => {
+                    info!(job_id = %job.job_id, status = ?job.status, "sweep: processed job");
+                }
+                Ok(None) => break,
+                Err(e) => {
+                    error!(error = %e, "sweep: error processing job");
+                    break;
+                }
+            }
+        }
+    }
+}