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use std::{
error::Error as StdError,
fmt::{self, Display, Formatter},
marker::PhantomData,
};
use body::{box_body, BoxBody, HyperBody};
use bytes::BytesMut;
use http::{HeaderMap, HeaderValue};
use prost::Message as PbMsg;
pub mod exports {
#[doc(inline)]
pub use async_trait::async_trait;
pub use bytes;
pub use futures_util;
pub use prost;
pub use tracing;
pub use http;
pub use http_body;
pub use hyper;
pub use tower;
pub use tower_http;
#[cfg(feature = "client")]
pub use rustls_native_certs;
pub use tokio_tungstenite::{self, tungstenite};
}
#[cfg(feature = "client")]
pub mod client;
#[cfg(feature = "server")]
pub mod server;
pub mod body;
pub type BoxError = Box<dyn std::error::Error + Send + Sync>;
pub type HttpRequest = http::Request<HyperBody>;
pub type HttpResponse = http::Response<BoxBody>;
pub const HRPC_HEADER: &[u8] = b"application/hrpc";
pub(crate) fn hrpc_header_value() -> HeaderValue {
unsafe {
http::HeaderValue::from_maybe_shared_unchecked(bytes::Bytes::from_static(HRPC_HEADER))
}
}
#[derive(Debug)]
pub struct Request<T> {
body: HyperBody,
header_map: HeaderMap,
message: PhantomData<T>,
}
impl Request<()> {
pub fn empty() -> Request<()> {
Self::new_body(HyperBody::empty())
}
}
impl<T> Request<T> {
pub(crate) fn new_body(body: HyperBody) -> Self {
Self {
body,
message: PhantomData,
header_map: {
#[allow(clippy::mutable_key_type)]
let mut map: HeaderMap = HeaderMap::with_capacity(1);
map.insert(http::header::CONTENT_TYPE, hrpc_header_value());
map
},
}
}
pub fn header_map(&self) -> &HeaderMap {
&self.header_map
}
pub fn header_map_mut(&mut self) -> &mut HeaderMap {
&mut self.header_map
}
}
impl<T: PbMsg> Request<T> {
pub fn new(msg: T) -> Self {
let encoded = encode_protobuf_message(msg).freeze();
Self::new_body(HyperBody::from(encoded))
}
}
#[derive(Debug)]
pub enum DecodeBodyError {
InvalidProtoMessage(prost::DecodeError),
InvalidBody(BoxError),
}
impl Display for DecodeBodyError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
Self::InvalidProtoMessage(err) => write!(
f,
"body was detected to be protobuf, but contains invalid protobuf message: {}",
err
),
Self::InvalidBody(err) => write!(f, "error occured while aggregating body: {}", err),
}
}
}
impl StdError for DecodeBodyError {
fn source(&self) -> Option<&(dyn StdError + 'static)> {
match self {
Self::InvalidProtoMessage(err) => Some(err),
Self::InvalidBody(err) => err.source(),
}
}
}
impl<T: PbMsg + Default> Request<T> {
#[inline]
pub async fn into_message(self) -> Result<T, DecodeBodyError> {
decode_body(box_body(self.body)).await
}
}
pub(crate) async fn decode_body<T: PbMsg + Default>(body: BoxBody) -> Result<T, DecodeBodyError> {
let buf = hyper::body::aggregate(body)
.await
.map_err(DecodeBodyError::InvalidBody)?;
let decoded = T::decode(buf).map_err(DecodeBodyError::InvalidProtoMessage)?;
Ok(decoded)
}
pub struct Response<T> {
data: T,
}
impl<T> Response<T> {
pub fn new(data: T) -> Response<T> {
Self { data }
}
pub fn into_message(self) -> T {
self.data
}
}
impl<T> From<T> for Response<T> {
fn from(data: T) -> Self {
Self { data }
}
}
pub trait IntoRequest<T> {
fn into_request(self) -> Request<T>;
}
impl<T: PbMsg> IntoRequest<T> for T {
fn into_request(self) -> Request<Self> {
Request::new(self)
}
}
impl<T> IntoRequest<T> for Request<T> {
fn into_request(self) -> Request<T> {
self
}
}
pub trait IntoResponse<T> {
fn into_response(self) -> Response<T>;
}
impl<T> IntoResponse<T> for T {
fn into_response(self) -> Response<T> {
Response::new(self)
}
}
impl<T> IntoResponse<T> for Response<T> {
fn into_response(self) -> Response<T> {
self
}
}
pub fn encode_protobuf_message_to(buf: &mut BytesMut, msg: impl prost::Message) {
buf.reserve(msg.encoded_len().saturating_sub(buf.len()));
buf.clear();
let _ = msg.encode(buf);
}
pub fn encode_protobuf_message(msg: impl prost::Message) -> BytesMut {
let mut buf = BytesMut::new();
encode_protobuf_message_to(&mut buf, msg);
buf
}
#[macro_export]
macro_rules! include_proto {
($package: tt) => {
include!(concat!(env!("OUT_DIR"), concat!("/", $package, ".rs")));
};
}