I might have missed it, but I cannot find how to give feedback to the user on the webpage during a long running task in actix_web. Program is in Rust.
Abstracted I have a route on "/calculate" that does long calculation. I now have an async function async fn calculate(webdata,identity,..)-> impl Responder {........HttpResponse::Ok().body("Done result = xxxyxyxyy"} that is put as the handler in the route in the App.
This works well for short calculations. For long calculations all I can see that I have the option of blocking the webpage until I have the result or giving an immediate response and loosing the result into the great galactic void (or as in some examples I did find: into the println! terminal ;-)).
Actually, for long calculations, I would like to execute the following pattern when the user navigates to "/calculate".
show " Working....." as the HttpResponse
do the calculation
show "Done. Result = xxxyxyxyxyx" as the HttpResponse
I know of web:block and web:spawn,but these are useful to protect the calculations, but I can still only manage to give one response from the handler. I know how to do it in larger front-end frameworks, such as react, or maybe even yew but I am just curious if I am missing an obvious way to do this in actix_web only.
Note1: in my application it is not actually a calculation, but a more involved set of operations. Also the actual responses are a bit more fancy and colorful.
Note2: It would be ideal if the set-up is such that I can also have a "Stop" button to stop the calculation. But that is the next step.