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use super::streaming;
use crate::codec::Streaming;
use crate::error::Error;
use crate::Body;
use futures::{try_ready, Future, Poll, Stream};
use http::{response, Response};
use prost::Message;
use std::fmt;
pub struct ResponseFuture<T, U, B: Body> {
state: State<T, U, B>,
}
enum State<T, U, B: Body> {
WaitResponse(streaming::ResponseFuture<T, U>),
WaitMessage {
head: Option<response::Parts>,
stream: Streaming<T, B>,
},
}
impl<T, U, B: Body> ResponseFuture<T, U, B> {
pub(super) fn new(inner: streaming::ResponseFuture<T, U>) -> Self {
let state = State::WaitResponse(inner);
ResponseFuture { state }
}
}
impl<T, U, B> Future for ResponseFuture<T, U, B>
where
T: Message + Default,
U: Future<Item = Response<B>>,
U::Error: Into<Error>,
B: Body,
B::Error: Into<Error>,
{
type Item = crate::Response<T>;
type Error = crate::Status;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
loop {
let response = match self.state {
State::WaitResponse(ref mut inner) => try_ready!(inner.poll()),
State::WaitMessage {
ref mut head,
ref mut stream,
} => {
let message = match try_ready!(stream.poll()) {
Some(message) => message,
None => {
return Err(crate::Status::new(
crate::Code::Internal,
"Missing response message.",
));
}
};
let head = head.take().unwrap();
let response = Response::from_parts(head, message);
return Ok(crate::Response::from_http(response).into());
}
};
let (head, body) = response.into_http().into_parts();
self.state = State::WaitMessage {
head: Some(head),
stream: body,
};
}
}
}
impl<T, U, B> fmt::Debug for ResponseFuture<T, U, B>
where
T: fmt::Debug,
U: fmt::Debug,
B: Body + fmt::Debug,
B::Data: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("ResponseFuture")
.field("state", &self.state)
.finish()
}
}
impl<T, U, B> fmt::Debug for State<T, U, B>
where
T: fmt::Debug,
U: fmt::Debug,
B: Body + fmt::Debug,
B::Data: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
State::WaitResponse(ref future) => f.debug_tuple("WaitResponse").field(future).finish(),
State::WaitMessage {
ref head,
ref stream,
} => f
.debug_struct("WaitMessage")
.field("head", head)
.field("stream", stream)
.finish(),
}
}
}