Hands-On Microservices with Rust

Upload handler

upload_handler is a bit complex, because it takes POST requests with a form that contains the uploaded image:

fn upload_handler(req: HttpRequest<State>) -> impl Future<Item = HttpResponse, Error = WebError> {    req.multipart()        .map(handle_multipart_item)        .flatten()        .into_future()        .and_then(|(bytes, stream)| {            if let Some(bytes) = bytes {                Ok(bytes)            } else {                Err((MultipartError::Incomplete, stream))            }        })        .map_err(|(err, _)| WebError::from(err))        .and_then(move |image| {            debug!("Image: {:?}", image);            let request = QrRequest { image };            req.state()                .addr                .send(SendMessage(request))                .from_err()                .map(move |task_id| {                    let record = Record {                        task_id: task_id.clone(),                        timestamp: Utc::now(),                        status: Status::InProgress,                    }; req.state().tasks.lock().unwrap().insert(task_id, ...