From d1e80e86e989dc0a425429dbac3b5252bfc232c4 Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin@piware.de>
Date: Mon, 12 Dec 2022 08:35:58 +0100
Subject: [PATCH] actix-server: Add "reverse input" websocket route

---
 actix-server/src/main.rs | 54 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/actix-server/src/main.rs b/actix-server/src/main.rs
index 58756de..af63efd 100644
--- a/actix-server/src/main.rs
+++ b/actix-server/src/main.rs
@@ -66,6 +66,40 @@ async fn ws_echo(req: HttpRequest, stream: web::Payload) -> Result<HttpResponse,
     ws::start(WsEcho {}, &req, stream)
 }
 
+struct WsRev;
+
+impl Actor for WsRev {
+    type Context = ws::WebsocketContext<Self>;
+}
+
+impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsRev {
+    fn handle(&mut self, msg: Result<ws::Message, ws::ProtocolError>, ctx: &mut Self::Context) {
+        log::info!("WsRev got message {:?}", msg);
+        match msg {
+            Ok(ws::Message::Ping(msg)) => ctx.pong(&msg),
+            Ok(ws::Message::Text(text)) => {
+                let rev = text.chars().rev().collect::<String>();
+                ctx.text(rev);
+            },
+            Ok(ws::Message::Binary(bin)) => {
+                let mut rev = bin.to_vec();
+                rev.reverse();
+                ctx.binary(rev);
+            }
+            Ok(ws::Message::Close(reason)) => {
+                ctx.close(reason);
+                ctx.stop();
+            },
+            _ => ctx.stop(),
+        }
+    }
+}
+
+#[get("/ws-rev")]
+async fn ws_rev(req: HttpRequest, stream: web::Payload) -> Result<HttpResponse, Error> {
+    ws::start(WsRev {}, &req, stream)
+}
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     env_logger::init_from_env(env_logger::Env::default().default_filter_or("info"));
@@ -76,6 +110,7 @@ async fn main() -> std::io::Result<()> {
             .service(static_file)
             .service(Files::new("/dir", "../static"))
             .service(ws_echo)
+            .service(ws_rev)
             .wrap(Logger::default())
     })
         .bind(("127.0.0.1", 3030))?
@@ -92,7 +127,7 @@ mod tests {
     use futures_util::sink::SinkExt;
     use futures_util::StreamExt;
 
-    use super::{hello, static_file, ws_echo};
+    use super::{hello, static_file, ws_echo, ws_rev};
 
     #[actix_web::test]
     async fn test_hello() {
@@ -183,4 +218,21 @@ mod tests {
         let received = client.next().await.unwrap().unwrap();
         assert_eq!(received, ws::Frame::Binary(web::Bytes::from_static(&[42, 99])));
     }
+
+    #[actix_web::test]
+    async fn test_ws_rev() {
+        // FIXME: duplicating the .service() call from main() here is super ugly, but it's hard to move that into a fn
+        let mut srv = actix_test::start(|| App::new().service(ws_rev));
+        let mut client = srv.ws_at("/ws-rev").await.unwrap();
+
+        // text reversed
+        client.send(ws::Message::Text("hello".into())).await.unwrap();
+        let received = client.next().await.unwrap().unwrap();
+        assert_eq!(received, ws::Frame::Text("olleh".into()));
+
+        // binary reversed
+        client.send(ws::Message::Binary(web::Bytes::from_static(&[42, 99]))).await.unwrap();
+        let received = client.next().await.unwrap().unwrap();
+        assert_eq!(received, ws::Frame::Binary(web::Bytes::from_static(&[99, 42])));
+    }
 }
-- 
2.39.5