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use crate::Error; use async_trait::async_trait; use futures::StreamExt; #[async_trait] pub trait ResponseContent where Self::Data: Send + 'static + Unpin, { type Data; async fn convert_response( response: hyper::Response<hyper::Body>, ) -> Result<http::Response<Self::Data>, Error>; } pub trait RequestContent where Self::Data: Send + 'static + Unpin, { type Data; fn apply_headers(&self, headers: &mut http::HeaderMap); fn into_body(self) -> Result<hyper::Body, Error>; } pub struct Empty; #[async_trait] impl ResponseContent for Empty { type Data = (); async fn convert_response( response: hyper::Response<hyper::Body>, ) -> Result<http::Response<Self::Data>, Error> { let (parts, _) = response.into_parts(); Ok(http::Response::from_parts(parts, ())) } } impl RequestContent for Empty { type Data = (); fn into_body(self) -> Result<hyper::Body, Error> { Ok(hyper::Body::empty()) } fn apply_headers(&self, headers: &mut http::HeaderMap) { if !headers.append("Content-Length", http::HeaderValue::from_static("0")) { log::warn!("Failed to add Content-Length header for Empty body"); } } } pub struct Json<T>(pub T); #[async_trait] impl<T> ResponseContent for Json<T> where T: serde::de::DeserializeOwned + Send + 'static + Unpin, { type Data = T; async fn convert_response( response: hyper::Response<hyper::Body>, ) -> Result<http::Response<Self::Data>, Error> { let (parts, mut body_stream) = response.into_parts(); let mut body = bytes::BytesMut::default(); while let Some(res) = body_stream.next().await { let bs = res?; body.extend(bs); } let received_status = parts.status; if received_status.as_u16() / 100 != 2 { return Err(Error::non_2xx(received_status, &body)); } serde_json::from_slice(&body) .map_err(|err| Error::deserialization(err, &body)) .map(move |body: T| http::Response::from_parts(parts, body)) } } impl<T> RequestContent for Json<T> where T: serde::Serialize + 'static + Send + Unpin, { type Data = T; fn apply_headers(&self, headers: &mut http::HeaderMap) { if !headers.append( "Content-Type", http::HeaderValue::from_static("application/json"), ) { log::warn!("Failed to add Content-Type header for Json body"); } } fn into_body(self) -> Result<hyper::Body, Error> { serde_json::to_vec(&self.0) .map_err(Error::Serialization) .map(|bs| { log::debug!( "Sending body: `{}`", std::str::from_utf8(&bs).unwrap_or("INVALID UTF8") ); hyper::Body::from(bs) }) } } pub struct Bytes(Vec<u8>); #[async_trait] impl ResponseContent for Bytes { type Data = Vec<u8>; async fn convert_response( response: hyper::Response<hyper::Body>, ) -> Result<http::Response<Self::Data>, Error> { let (parts, mut body_stream) = response.into_parts(); let mut body = bytes::BytesMut::default(); while let Some(res) = body_stream.next().await { let bs = res?; body.extend(bs); } let received_status = parts.status; if received_status.as_u16() / 100 != 2 { return Err(Error::non_2xx(received_status, &body)); } Ok(http::Response::from_parts(parts, body.to_vec())) } } impl RequestContent for Bytes { type Data = Vec<u8>; fn apply_headers(&self, headers: &mut http::HeaderMap) { if !headers.append( "Content-Type", http::HeaderValue::from_static("application/json"), ) { log::warn!("Failed to add Content-Type header for Json body"); } } fn into_body(self) -> Result<hyper::Body, Error> { Ok(hyper::Body::from(self.0)) } }