Rework actix session (#212)

Co-authored-by: Rob Ede <robjtede@icloud.com>
Co-authored-by: Luca P <rust@lpalmieri.com>
Co-authored-by: Sebastian Rollén <38324289+SebRollen@users.noreply.github.com>

actix-session/examples/basic.rs

@@ -0,0 +1,43 @@
+use actix_session::{storage::RedisActorSessionStore, Session, SessionMiddleware};
+use actix_web::{cookie::Key, middleware, web, App, Error, HttpRequest, HttpServer, Responder};
+
+/// simple handler
+async fn index(req: HttpRequest, session: Session) -> Result<impl Responder, Error> {
+    println!("{:?}", req);
+
+    // session
+    if let Some(count) = session.get::<i32>("counter")? {
+        println!("SESSION value: {}", count);
+        session.insert("counter", count + 1)?;
+    } else {
+        session.insert("counter", 1)?;
+    }
+
+    Ok("Welcome!")
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+
+    // The signing key would usually be read from a configuration file/environment variables.
+    let signing_key = Key::generate();
+
+    log::info!("starting HTTP server at http://localhost:8080");
+
+    HttpServer::new(move || {
+        App::new()
+            // enable logger
+            .wrap(middleware::Logger::default())
+            // cookie session middleware
+            .wrap(SessionMiddleware::new(
+                RedisActorSessionStore::new("127.0.0.1:6379"),
+                signing_key.clone(),
+            ))
+            // register simple route, handle all methods
+            .service(web::resource("/").to(index))
+    })
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
+}