Handlers are _named operations_, which can be exposed via routes.

Each domain module that exposes handlers does so through a `handlers` child module, ideally as a top-level symbol that can be plugged directly into Axum's `MethodRouter`. Modules could make exceptions to this - kill the doctrinaire inside yourself, after all - but none of the API modules that actually exist need such exceptions, and consistency is useful.

The related details of request types, URL types, response types, errors, &c &c are then organized into modules under `handlers`, along with their respective tests.

1 files changed, 273 insertions, 0 deletions

diff --git a/src/event/handlers/stream/test/channel.rs b/src/event/handlers/stream/test/channel.rs
new file mode 100644
index 0000000..187c3c3
--- /dev/null
+++ b/src/event/handlers/stream/test/channel.rs
@@ -0,0 +1,273 @@
+use axum::extract::State;
+use axum_extra::extract::Query;
+use futures::{future, stream::StreamExt as _};
+
+use crate::test::fixtures::{self, future::Expect as _};
+
+#[tokio::test]
+async fn creating() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Create a channel
+
+    let name = fixtures::channel::propose();
+    let channel = app
+        .channels()
+        .create(&name, &fixtures::now())
+        .await
+        .expect("creating a channel succeeds");
+
+    // Verify channel created event
+
+    events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::created)
+        .filter(|event| future::ready(event.channel == channel))
+        .next()
+        .expect_some("channel created event is delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn previously_created() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Create a channel
+
+    let name = fixtures::channel::propose();
+    let channel = app
+        .channels()
+        .create(&name, &fixtures::now())
+        .await
+        .expect("creating a channel succeeds");
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Verify channel created event
+
+    let _ = events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::created)
+        .filter(|event| future::ready(event.channel == channel))
+        .next()
+        .expect_some("channel created event is delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn expiring() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Expire channels
+
+    app.channels()
+        .expire(&fixtures::now())
+        .await
+        .expect("expiring channels always succeeds");
+
+    // Check for expiry event
+    let _ = events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::deleted)
+        .filter(|event| future::ready(event.id == channel.id))
+        .next()
+        .expect_some("a deleted channel event will be delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn previously_expired() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Expire channels
+
+    app.channels()
+        .expire(&fixtures::now())
+        .await
+        .expect("expiring channels always succeeds");
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Check for expiry event
+    let _ = events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::deleted)
+        .filter(|event| future::ready(event.id == channel.id))
+        .next()
+        .expect_some("a deleted channel event will be delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn deleting() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Delete the channel
+
+    app.channels()
+        .delete(&channel.id, &fixtures::now())
+        .await
+        .expect("deleting a valid channel succeeds");
+
+    // Check for delete event
+    let _ = events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::deleted)
+        .filter(|event| future::ready(event.id == channel.id))
+        .next()
+        .expect_some("a deleted channel event will be delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn previously_deleted() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Delete the channel
+
+    app.channels()
+        .delete(&channel.id, &fixtures::now())
+        .await
+        .expect("deleting a valid channel succeeds");
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Check for expiry event
+    let _ = events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::deleted)
+        .filter(|event| future::ready(event.id == channel.id))
+        .next()
+        .expect_some("a deleted channel event will be delivered")
+        .await;
+}
+
+#[tokio::test]
+async fn previously_purged() {
+    // Set up the environment
+
+    let app = fixtures::scratch_app().await;
+    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
+    let resume_point = fixtures::boot::resume_point(&app).await;
+
+    // Delete and purge the channel
+
+    app.channels()
+        .delete(&channel.id, &fixtures::ancient())
+        .await
+        .expect("deleting a valid channel succeeds");
+
+    app.channels()
+        .purge(&fixtures::now())
+        .await
+        .expect("purging channels always succeeds");
+
+    // Subscribe
+
+    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
+    let super::Response(events) = super::handler(
+        State(app.clone()),
+        subscriber,
+        None,
+        Query(super::QueryParams { resume_point }),
+    )
+    .await
+    .expect("subscribe never fails");
+
+    // Check for expiry event
+    events
+        .filter_map(fixtures::event::channel)
+        .filter_map(fixtures::event::channel::deleted)
+        .filter(|event| future::ready(event.id == channel.id))
+        .next()
+        .expect_wait("deleted channel events not delivered")
+        .await;
+}