Setup a basic API route

src/infra/tcp_server.rs

@@ -4,7 +4,7 @@ use actix_files::{Files, NamedFile};
 use actix_http::HttpServiceBuilder;
 use actix_server::ServerBuilder;
 use actix_service::map_config;
-use actix_web::{dev::AppConfig, web, App, HttpRequest};
+use actix_web::{dev::AppConfig, web, App, HttpRequest, HttpResponse};
 use anyhow::{Context, Result};
 use std::path::PathBuf;
 
@@ -16,6 +16,34 @@ async fn index(req: HttpRequest) -> actix_web::Result<NamedFile> {
     Ok(NamedFile::open(path)?)
 }
 
+type ApiResult<M> = actix_web::Either<web::Json<M>, HttpResponse>;
+
+async fn user_list_handler(_info: web::Json<ListUsersRequest>) -> ApiResult<Vec<User>> {
+    if true {
+        ApiResult::Right(HttpResponse::Conflict().finish())
+    } else {
+        ApiResult::Left(web::Json(Vec::<User>::new()))
+    }
+}
+
+fn api_config(cfg: &mut web::ServiceConfig) {
+    let json_config = web::JsonConfig::default()
+        .limit(4096)
+        .error_handler(|err, _req| {
+            // create custom error response
+            actix_web::error::InternalError::from_response(
+                err,
+                HttpResponse::Conflict().finish().into(),
+            )
+            .into()
+        });
+    cfg.service(
+        web::resource("/users")
+            .app_data(json_config)
+            .route(web::post().to(user_list_handler)),
+    );
+}
+
 pub fn build_tcp_server<Backend>(
     config: &Configuration,
     _backend_handler: Backend,
@@ -34,6 +62,8 @@ where
                             "/{filename:(index\\.html|main\\.js)?}",
                             web::get().to(index),
                         )
+                        // API endpoint.
+                        .service(web::scope("/api").configure(api_config))
                         // Serve the /pkg path with the compiled WASM app.
                         .service(Files::new("/pkg", "./app/pkg")),
                     |_| AppConfig::default(),