Return a JsonValue object from an actix-web HttpRequest

Question

I'm reading the examples of actix-web, but as I am quite new to Rust I am having some issues understanding how to adapt the code to my needs.

Given an actix-web HttpRequest, I want to parse the payload and return a JsonValue. I can't figure out how to change this function to return the JsonValue rather than a HttpResponse.

fn index_mjsonrust(req: &HttpRequest, ) -> Box<Future<Item = HttpResponse, Error = Error>> {
    req.payload()
        .concat2()
        .from_err()
        .and_then(|body| {
            // body is loaded, now we can deserialize json-rust
            let result = json::parse(std::str::from_utf8(&body).unwrap()); // return Result
            let injson: JsonValue = match result {
                Ok(v) => v,
                Err(e) => object!{"err" => e.to_string() },
            };
            Ok(HttpResponse::Ok()
                .content_type("application/json")
                .body(injson.dump()))
        })
        .responder()
}

Would it be better to just return the JsonValue rather than a Future?

Answer 1

You have to convert JsonValue to a string or bytes, then you can set it as the HttpResponse body. You can not directly return a JsonValue instead of box because the request body reading process is asynchronous.