WIP create a handler to download a file chunk by chunk.

backend/exposition/src/video/handler.rs

@@ -0,0 +1,17 @@
+use actix_web::{get, HttpResponse};
+use tokio::fs::File;
+use tokio_util::codec::{BytesCodec, FramedRead};
+use futures_util::stream::StreamExt;
+
+#[get("/download")]
+pub async fn download_file() -> HttpResponse {
+    HttpResponse::Ok()
+        .content_type("application/octet-stream")
+        .streaming(async_stream::stream! {
+            let file = File::open("/home/florian/Video/2019-06-02 17-09-30.flv").await.expect("Failed to open file");
+            let mut stream = FramedRead::new(file, BytesCodec::new());
+            while let Some(chunk) = stream.next().await {
+                yield chunk.map(|bytes| bytes.freeze());
+            }
+        })
+}