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use crate::codec::{Direction, Streaming};
use crate::error::Error;
use crate::Body;
use crate::Code;
use futures::{try_ready, Future, Poll};
use http::Response;
use prost::Message;
use std::marker::PhantomData;
#[derive(Debug)]
pub struct ResponseFuture<T, U> {
inner: U,
_m: PhantomData<T>,
}
impl<T, U> ResponseFuture<T, U> {
pub(super) fn new(inner: U) -> Self {
ResponseFuture {
inner,
_m: PhantomData,
}
}
}
impl<T, U, B> Future for ResponseFuture<T, U>
where
T: Message + Default,
U: Future<Item = Response<B>>,
U::Error: Into<Error>,
B: Body,
{
type Item = crate::Response<Streaming<T, B>>;
type Error = crate::Status;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
use crate::codec::Decoder;
use crate::generic::Streaming;
let response = try_ready!(self
.inner
.poll()
.map_err(|err| crate::Status::from_error(&*(err.into()))));
let status_code = response.status();
let trailers_only_status = crate::Status::from_header_map(response.headers());
let expect_additional_trailers = trailers_only_status.is_none();
if let Some(status) = trailers_only_status {
if status.code() != Code::Ok {
return Err(status);
}
}
let streaming_direction = if expect_additional_trailers {
Direction::Response(status_code)
} else {
Direction::EmptyResponse
};
let response =
response.map(move |body| Streaming::new(Decoder::new(), body, streaming_direction));
Ok(crate::Response::from_http(response).into())
}
}