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, 67 insertions, 0 deletions

diff --git a/src/channel/handlers/create/mod.rs b/src/channel/handlers/create/mod.rs
new file mode 100644
index 0000000..2c860fc
--- /dev/null
+++ b/src/channel/handlers/create/mod.rs
@@ -0,0 +1,67 @@
+use axum::{
+    extract::{Json, State},
+    http::StatusCode,
+    response::{self, IntoResponse},
+};
+
+use crate::{
+    app::App,
+    channel::{Channel, app},
+    clock::RequestedAt,
+    error::Internal,
+    name::Name,
+    token::extract::Identity,
+};
+
+#[cfg(test)]
+mod test;
+
+pub async fn handler(
+    State(app): State<App>,
+    _: Identity, // requires auth, but doesn't actually care who you are
+    RequestedAt(created_at): RequestedAt,
+    Json(request): Json<Request>,
+) -> Result<Response, Error> {
+    let channel = app
+        .channels()
+        .create(&request.name, &created_at)
+        .await
+        .map_err(Error)?;
+
+    Ok(Response(channel))
+}
+
+#[derive(serde::Deserialize)]
+pub struct Request {
+    pub name: Name,
+}
+
+#[derive(Debug)]
+pub struct Response(pub Channel);
+
+impl IntoResponse for Response {
+    fn into_response(self) -> response::Response {
+        let Self(channel) = self;
+        (StatusCode::ACCEPTED, Json(channel)).into_response()
+    }
+}
+
+#[derive(Debug)]
+pub struct Error(pub app::CreateError);
+
+impl IntoResponse for Error {
+    fn into_response(self) -> response::Response {
+        let Self(error) = self;
+        match error {
+            app::CreateError::DuplicateName(_) => {
+                (StatusCode::CONFLICT, error.to_string()).into_response()
+            }
+            app::CreateError::InvalidName(_) => {
+                (StatusCode::BAD_REQUEST, error.to_string()).into_response()
+            }
+            app::CreateError::Name(_) | app::CreateError::Database(_) => {
+                Internal::from(error).into_response()
+            }
+        }
+    }
+}