621 lines
20 KiB
Markdown
621 lines
20 KiB
Markdown
# Event-Driven Poster Sync Implementation Plan
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> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
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**Goal:** Add an `EventHandler` trait to the event-publisher adapter and implement `PosterSyncHandler` so that a `MovieDiscovered` event automatically triggers the existing `sync_poster` use case with exponential-backoff retry.
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**Architecture:** `EventWorker` gains a `Vec<Box<dyn EventHandler>>` and fans out each received event to all registered handlers sequentially. `PosterSyncHandler` lives in the `presentation` crate (composition root), holds `AppContext`, and calls `sync_poster::execute` on `MovieDiscovered` events — ignoring all others. Retry is up to 3 retries (4 total attempts) with delays 1s → 2s → 4s.
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**Tech Stack:** Rust, tokio::sync::mpsc, async-trait, existing `sync_poster` use case
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---
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## File Map
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| File | Status | Responsibility |
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|---|---|---|
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| `crates/adapters/event-publisher/src/lib.rs` | Modify | Add `EventHandler` trait; extend `EventWorker` and `create_event_channel` |
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| `crates/application/src/commands.rs` | Modify | Add `#[derive(Clone)]` to `SyncPosterCommand` |
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| `crates/presentation/src/lib.rs` | Modify | Expose `pub mod event_handlers` |
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| `crates/presentation/src/event_handlers.rs` | Create | `PosterSyncHandler` implementation |
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| `crates/presentation/src/main.rs` | Modify | Wire `PosterSyncHandler` into `create_event_channel` |
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---
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## Task 1: Add `EventHandler` trait and update `EventWorker`
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**Files:**
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- Modify: `crates/adapters/event-publisher/src/lib.rs`
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- [ ] **Step 1: Write the failing test**
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Add to the bottom of `crates/adapters/event-publisher/src/lib.rs`:
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```rust
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::sync::{Arc, Mutex};
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use async_trait::async_trait;
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use domain::{
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errors::DomainError,
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events::DomainEvent,
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value_objects::{ExternalMetadataId, MovieId},
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};
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struct RecordingHandler {
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calls: Arc<Mutex<Vec<String>>>,
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}
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#[async_trait]
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impl EventHandler for RecordingHandler {
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async fn handle(&self, event: &DomainEvent) -> Result<(), DomainError> {
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let label = match event {
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DomainEvent::MovieDiscovered { .. } => "movie_discovered",
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DomainEvent::ReviewLogged { .. } => "review_logged",
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};
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self.calls.lock().unwrap().push(label.to_string());
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Ok(())
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}
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}
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#[tokio::test]
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async fn single_handler_receives_event() {
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let calls = Arc::new(Mutex::new(vec![]));
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let handler = RecordingHandler { calls: Arc::clone(&calls) };
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let config = EventPublisherConfig { channel_buffer: 8 };
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let (publisher, worker) = create_event_channel(config, vec![Box::new(handler)]);
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tokio::spawn(worker.run());
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let event = DomainEvent::MovieDiscovered {
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movie_id: MovieId::generate(),
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external_metadata_id: ExternalMetadataId::new("tt1234567".into()).unwrap(),
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};
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publisher.publish(&event).await.unwrap();
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tokio::time::sleep(std::time::Duration::from_millis(50)).await;
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assert_eq!(*calls.lock().unwrap(), vec!["movie_discovered"]);
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}
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#[tokio::test]
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async fn multiple_handlers_all_receive_event() {
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let calls1 = Arc::new(Mutex::new(vec![]));
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let calls2 = Arc::new(Mutex::new(vec![]));
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let handler1 = RecordingHandler { calls: Arc::clone(&calls1) };
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let handler2 = RecordingHandler { calls: Arc::clone(&calls2) };
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let config = EventPublisherConfig { channel_buffer: 8 };
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let (publisher, worker) = create_event_channel(
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config,
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vec![Box::new(handler1), Box::new(handler2)],
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);
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tokio::spawn(worker.run());
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let event = DomainEvent::MovieDiscovered {
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movie_id: MovieId::generate(),
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external_metadata_id: ExternalMetadataId::new("tt9999999".into()).unwrap(),
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};
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publisher.publish(&event).await.unwrap();
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tokio::time::sleep(std::time::Duration::from_millis(50)).await;
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assert_eq!(calls1.lock().unwrap().len(), 1);
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assert_eq!(calls2.lock().unwrap().len(), 1);
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}
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#[tokio::test]
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async fn handler_error_does_not_stop_worker() {
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struct FailingHandler;
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#[async_trait]
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impl EventHandler for FailingHandler {
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async fn handle(&self, _: &DomainEvent) -> Result<(), DomainError> {
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Err(DomainError::InfrastructureError("boom".into()))
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}
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}
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let calls = Arc::new(Mutex::new(vec![]));
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let good = RecordingHandler { calls: Arc::clone(&calls) };
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let config = EventPublisherConfig { channel_buffer: 8 };
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let (publisher, worker) = create_event_channel(
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config,
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vec![Box::new(FailingHandler), Box::new(good)],
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);
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tokio::spawn(worker.run());
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let event = DomainEvent::MovieDiscovered {
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movie_id: MovieId::generate(),
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external_metadata_id: ExternalMetadataId::new("tt0000001".into()).unwrap(),
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};
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publisher.publish(&event).await.unwrap();
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tokio::time::sleep(std::time::Duration::from_millis(50)).await;
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// good handler still ran despite failing handler before it
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assert_eq!(calls.lock().unwrap().len(), 1);
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}
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}
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```
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- [ ] **Step 2: Run tests to verify they fail**
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```bash
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cargo test -p event-publisher 2>&1 | tail -20
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```
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Expected: compile errors — `EventHandler` not defined, `create_event_channel` wrong arity.
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- [ ] **Step 3: Replace `lib.rs` with updated implementation**
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Replace the full content of `crates/adapters/event-publisher/src/lib.rs` with:
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```rust
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use async_trait::async_trait;
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use domain::{errors::DomainError, events::DomainEvent, ports::EventPublisher};
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use tokio::sync::mpsc;
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pub struct EventPublisherConfig {
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pub channel_buffer: usize,
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}
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impl EventPublisherConfig {
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pub fn from_env() -> Self {
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let channel_buffer = std::env::var("EVENT_CHANNEL_BUFFER")
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.ok()
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.and_then(|v| v.parse().ok())
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.unwrap_or(128);
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Self { channel_buffer }
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}
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}
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#[async_trait]
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pub trait EventHandler: Send + Sync {
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async fn handle(&self, event: &DomainEvent) -> Result<(), DomainError>;
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}
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pub struct ChannelEventPublisher {
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sender: mpsc::Sender<DomainEvent>,
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}
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#[async_trait]
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impl EventPublisher for ChannelEventPublisher {
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async fn publish(&self, event: &DomainEvent) -> Result<(), DomainError> {
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self.sender
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.send(event.clone())
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.await
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.map_err(|e| DomainError::InfrastructureError(e.to_string()))
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}
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}
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pub struct EventWorker {
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receiver: mpsc::Receiver<DomainEvent>,
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handlers: Vec<Box<dyn EventHandler>>,
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}
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impl EventWorker {
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pub async fn run(mut self) {
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while let Some(event) = self.receiver.recv().await {
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match &event {
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DomainEvent::ReviewLogged {
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review_id,
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movie_id,
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user_id,
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rating,
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watched_at,
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} => {
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tracing::info!(
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review_id = %review_id.value(),
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movie_id = %movie_id.value(),
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user_id = %user_id.value(),
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rating = rating.value(),
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watched_at = %watched_at,
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"event: review_logged"
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);
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}
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DomainEvent::MovieDiscovered {
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movie_id,
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external_metadata_id,
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} => {
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tracing::info!(
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movie_id = %movie_id.value(),
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external_id = external_metadata_id.value(),
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"event: movie_discovered"
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);
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}
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}
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for handler in &self.handlers {
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if let Err(e) = handler.handle(&event).await {
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tracing::error!("event handler error: {e}");
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}
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}
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}
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tracing::info!("event worker shut down");
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}
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}
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pub fn create_event_channel(
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config: EventPublisherConfig,
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handlers: Vec<Box<dyn EventHandler>>,
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) -> (ChannelEventPublisher, EventWorker) {
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let (tx, rx) = mpsc::channel(config.channel_buffer);
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(
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ChannelEventPublisher { sender: tx },
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EventWorker {
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receiver: rx,
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handlers,
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},
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)
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}
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#[cfg(test)]
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mod tests {
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// paste the test module from Step 1 here
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}
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```
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- [ ] **Step 4: Run tests to verify they pass**
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```bash
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cargo test -p event-publisher 2>&1 | tail -20
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```
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Expected: `test result: ok. 3 passed`
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- [ ] **Step 5: Commit**
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```bash
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git add crates/adapters/event-publisher/src/lib.rs
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git commit -m "feat(event-publisher): add EventHandler trait and fan-out in EventWorker"
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```
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---
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## Task 2: Derive `Clone` on `SyncPosterCommand`
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**Files:**
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- Modify: `crates/application/src/commands.rs`
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The `PosterSyncHandler` retry loop reconstructs the command on each attempt, which requires `Clone` on `String` (already impl'd) and `Uuid` (Copy) — but it's cleaner to `#[derive(Clone)]` directly.
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- [ ] **Step 1: Add `#[derive(Clone)]` to `SyncPosterCommand`**
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In `crates/application/src/commands.rs`, find the `SyncPosterCommand` struct (line ~17) and add the derive:
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```rust
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#[derive(Clone)]
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pub struct SyncPosterCommand {
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pub movie_id: Uuid,
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pub external_metadata_id: String,
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}
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```
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- [ ] **Step 2: Verify it compiles**
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```bash
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cargo build -p application 2>&1 | tail -10
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```
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Expected: clean build.
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- [ ] **Step 3: Commit**
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```bash
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git add crates/application/src/commands.rs
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git commit -m "feat(application): derive Clone on SyncPosterCommand"
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```
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---
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## Task 3: Implement `PosterSyncHandler`
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**Files:**
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- Create: `crates/presentation/src/event_handlers.rs`
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- Modify: `crates/presentation/src/lib.rs`
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- [ ] **Step 1: Write the failing test first — create `event_handlers.rs` with tests only**
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Create `crates/presentation/src/event_handlers.rs`:
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```rust
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use std::time::Duration;
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use application::{commands::SyncPosterCommand, context::AppContext, use_cases::sync_poster};
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use async_trait::async_trait;
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use domain::{errors::DomainError, events::DomainEvent};
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use event_publisher::EventHandler;
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pub struct PosterSyncHandler {
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ctx: AppContext,
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max_retries: u32,
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}
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impl PosterSyncHandler {
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pub fn new(ctx: AppContext, max_retries: u32) -> Self {
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Self { ctx, max_retries }
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}
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}
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#[async_trait]
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impl EventHandler for PosterSyncHandler {
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async fn handle(&self, event: &DomainEvent) -> Result<(), DomainError> {
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todo!()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::sync::Arc;
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use async_trait::async_trait;
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use application::config::AppConfig;
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use domain::{
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errors::DomainError,
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events::DomainEvent,
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models::{DiaryEntry, DiaryFilter, Movie, Review, ReviewHistory, User, collections::Paginated},
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ports::{
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AuthService, EventPublisher, GeneratedToken, MetadataClient, MetadataSearchCriteria,
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MovieRepository, PasswordHasher, PosterFetcherClient, PosterStorage, UserRepository,
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},
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value_objects::{
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Email, ExternalMetadataId, MovieId, MovieTitle, PasswordHash, PosterPath, PosterUrl,
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Rating, ReleaseYear, ReviewId, UserId,
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},
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};
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// Panic stubs — never called in the "ignored event" test path
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struct PanicRepo;
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struct PanicMetadata;
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struct PanicFetcher;
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struct PanicStorage;
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struct PanicAuth;
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struct PanicHasher;
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struct PanicUserRepo;
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struct NoopPublisher;
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#[async_trait]
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impl MovieRepository for PanicRepo {
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async fn get_movie_by_external_id(&self, _: &ExternalMetadataId) -> Result<Option<Movie>, DomainError> { panic!("unexpected") }
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async fn get_movie_by_id(&self, _: &MovieId) -> Result<Option<Movie>, DomainError> { panic!("unexpected") }
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async fn get_movies_by_title_and_year(&self, _: &MovieTitle, _: &ReleaseYear) -> Result<Vec<Movie>, DomainError> { panic!("unexpected") }
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async fn upsert_movie(&self, _: &Movie) -> Result<(), DomainError> { panic!("unexpected") }
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async fn save_review(&self, _: &Review) -> Result<DomainEvent, DomainError> { panic!("unexpected") }
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async fn query_diary(&self, _: &DiaryFilter) -> Result<Paginated<DiaryEntry>, DomainError> { panic!("unexpected") }
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async fn get_review_history(&self, _: &MovieId) -> Result<ReviewHistory, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl MetadataClient for PanicMetadata {
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async fn fetch_movie_metadata(&self, _: &MetadataSearchCriteria) -> Result<Movie, DomainError> { panic!("unexpected") }
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async fn get_poster_url(&self, _: &ExternalMetadataId) -> Result<Option<PosterUrl>, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl PosterFetcherClient for PanicFetcher {
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async fn fetch_poster_bytes(&self, _: &PosterUrl) -> Result<Vec<u8>, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl PosterStorage for PanicStorage {
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async fn store_poster(&self, _: &MovieId, _: &[u8]) -> Result<PosterPath, DomainError> { panic!("unexpected") }
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async fn get_poster(&self, _: &PosterPath) -> Result<Vec<u8>, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl AuthService for PanicAuth {
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async fn generate_token(&self, _: &UserId) -> Result<GeneratedToken, DomainError> { panic!("unexpected") }
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async fn validate_token(&self, _: &str) -> Result<UserId, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl PasswordHasher for PanicHasher {
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async fn hash(&self, _: &str) -> Result<PasswordHash, DomainError> { panic!("unexpected") }
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async fn verify(&self, _: &str, _: &PasswordHash) -> Result<bool, DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl UserRepository for PanicUserRepo {
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async fn find_by_email(&self, _: &Email) -> Result<Option<User>, DomainError> { panic!("unexpected") }
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async fn save(&self, _: &User) -> Result<(), DomainError> { panic!("unexpected") }
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}
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#[async_trait]
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impl EventPublisher for NoopPublisher {
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async fn publish(&self, _: &DomainEvent) -> Result<(), DomainError> { Ok(()) }
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}
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fn panic_ctx() -> AppContext {
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AppContext {
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repository: Arc::new(PanicRepo),
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metadata_client: Arc::new(PanicMetadata),
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poster_fetcher: Arc::new(PanicFetcher),
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poster_storage: Arc::new(PanicStorage),
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event_publisher: Arc::new(NoopPublisher),
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auth_service: Arc::new(PanicAuth),
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password_hasher: Arc::new(PanicHasher),
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user_repository: Arc::new(PanicUserRepo),
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config: AppConfig { allow_registration: false },
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}
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}
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#[tokio::test]
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async fn review_logged_is_ignored() {
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let handler = PosterSyncHandler::new(panic_ctx(), 3);
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let event = DomainEvent::ReviewLogged {
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review_id: ReviewId::generate(),
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movie_id: MovieId::generate(),
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user_id: UserId::generate(),
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rating: Rating::new(4).unwrap(),
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watched_at: chrono::NaiveDateTime::from_timestamp_opt(0, 0).unwrap(),
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};
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// returns Ok without touching any panic stubs
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assert!(handler.handle(&event).await.is_ok());
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}
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}
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```
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- [ ] **Step 2: Expose the module in `lib.rs`**
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Add to `crates/presentation/src/lib.rs`:
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```rust
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pub mod event_handlers;
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```
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- [ ] **Step 3: Run the test to verify it fails**
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```bash
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cargo test -p presentation event_handlers 2>&1 | tail -20
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```
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Expected: compile error or test failure because `handle` is `todo!()`.
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- [ ] **Step 4: Implement `handle` in `PosterSyncHandler`**
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Replace the `todo!()` body in `crates/presentation/src/event_handlers.rs`:
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```rust
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#[async_trait]
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impl EventHandler for PosterSyncHandler {
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async fn handle(&self, event: &DomainEvent) -> Result<(), DomainError> {
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let (movie_id, external_metadata_id) = match event {
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DomainEvent::MovieDiscovered {
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movie_id,
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external_metadata_id,
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} => (movie_id.value(), external_metadata_id.value().to_owned()),
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_ => return Ok(()),
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};
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let mut last_err: Option<DomainError> = None;
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for attempt in 0..=self.max_retries {
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let cmd = SyncPosterCommand {
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movie_id,
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external_metadata_id: external_metadata_id.clone(),
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};
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match sync_poster::execute(&self.ctx, cmd).await {
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Ok(()) => return Ok(()),
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Err(e) => {
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if attempt < self.max_retries {
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let delay = Duration::from_secs(2u64.pow(attempt));
|
|
tracing::warn!(
|
|
attempt = attempt + 1,
|
|
max_attempts = self.max_retries + 1,
|
|
delay_secs = delay.as_secs(),
|
|
"poster sync failed, retrying: {e}"
|
|
);
|
|
tokio::time::sleep(delay).await;
|
|
}
|
|
last_err = Some(e);
|
|
}
|
|
}
|
|
}
|
|
|
|
let err = last_err.unwrap();
|
|
tracing::error!(
|
|
attempts = self.max_retries + 1,
|
|
"poster sync failed after all attempts: {err}"
|
|
);
|
|
Err(err)
|
|
}
|
|
}
|
|
```
|
|
|
|
- [ ] **Step 5: Run the test to verify it passes**
|
|
|
|
```bash
|
|
cargo test -p presentation event_handlers 2>&1 | tail -20
|
|
```
|
|
|
|
Expected: `test result: ok. 1 passed`
|
|
|
|
- [ ] **Step 6: Commit**
|
|
|
|
```bash
|
|
git add crates/presentation/src/event_handlers.rs crates/presentation/src/lib.rs
|
|
git commit -m "feat(presentation): implement PosterSyncHandler with retry"
|
|
```
|
|
|
|
---
|
|
|
|
## Task 4: Wire `PosterSyncHandler` in `main.rs`
|
|
|
|
**Files:**
|
|
- Modify: `crates/presentation/src/main.rs`
|
|
|
|
- [ ] **Step 1: Add the import**
|
|
|
|
In `crates/presentation/src/main.rs`, update the import block. The existing line is:
|
|
|
|
```rust
|
|
use event_publisher::{EventPublisherConfig, create_event_channel};
|
|
```
|
|
|
|
Add below it:
|
|
|
|
```rust
|
|
use presentation::event_handlers::PosterSyncHandler;
|
|
```
|
|
|
|
- [ ] **Step 2: Wire the handler**
|
|
|
|
In `wire_dependencies`, find the two existing lines:
|
|
|
|
```rust
|
|
let (event_publisher, event_worker) = create_event_channel(EventPublisherConfig::from_env());
|
|
tokio::spawn(event_worker.run());
|
|
```
|
|
|
|
Replace with:
|
|
|
|
```rust
|
|
let poster_handler = PosterSyncHandler::new(app_ctx.clone(), 3); // 3 retries = 4 total attempts
|
|
let (event_publisher, event_worker) = create_event_channel(
|
|
EventPublisherConfig::from_env(),
|
|
vec![Box::new(poster_handler)],
|
|
);
|
|
tokio::spawn(event_worker.run());
|
|
```
|
|
|
|
Note: `app_ctx.clone()` is cheap — all fields are `Arc<dyn Trait>`.
|
|
|
|
- [ ] **Step 3: Build the full workspace**
|
|
|
|
```bash
|
|
cargo build 2>&1 | tail -20
|
|
```
|
|
|
|
Expected: clean build with no errors.
|
|
|
|
- [ ] **Step 4: Run all tests**
|
|
|
|
```bash
|
|
cargo test 2>&1 | tail -20
|
|
```
|
|
|
|
Expected: all tests pass.
|
|
|
|
- [ ] **Step 5: Commit**
|
|
|
|
```bash
|
|
git add crates/presentation/src/main.rs
|
|
git commit -m "feat(presentation): wire PosterSyncHandler into event worker"
|
|
```
|
|
|
|
---
|
|
|
|
## Verification
|
|
|
|
After all tasks complete, smoke-test end-to-end:
|
|
|
|
```bash
|
|
# Start the server
|
|
RUST_LOG=info cargo run -p presentation
|
|
|
|
# In another terminal: log a review for a movie not yet in the DB
|
|
# (requires valid JWT — use the existing login endpoint first)
|
|
|
|
# Watch the server logs for:
|
|
# event: movie_discovered movie_id=<uuid> external_id=tt...
|
|
# poster sync attempt logs (or success with no retries needed)
|
|
```
|
|
|
|
To confirm the poster was stored, check the configured object store bucket/directory for a file named with the movie's UUID.
|