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use crate::executor;
use core::fmt;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::{cmp, debug_assert, io};
use futures_core::Stream;
use hyper::body::HttpBody;
pub use hyper::body::Bytes;
/// An HTTP request.
///
/// See [`http::Request`](hyper::Request) and [`Body`] for details.
pub type Request = hyper::Request<Body>;
/// An HTTP response.
///
/// You can create a response with the [`new`](hyper::Response::new) method:
///
/// ```
/// # use astra::{Response, Body};
/// let response = Response::new(Body::new("Hello world!"));
/// ```
///
/// Or with a [`ResponseBuilder`]:
///
/// ```
/// # use astra::{ResponseBuilder, Body};
/// let response = ResponseBuilder::new()
/// .status(404)
/// .header("X-Custom-Foo", "Bar")
/// .body(Body::new("Page not found."))
/// .unwrap();
/// ```
///
/// See [`http::Response`](hyper::Response) and [`Body`] for details.
pub type Response = hyper::Response<Body>;
/// A builder for an HTTP response.
///
/// ```
/// use astra::{ResponseBuilder, Body};
///
/// let response = ResponseBuilder::new()
/// .status(404)
/// .header("X-Custom-Foo", "Bar")
/// .body(Body::new("Page not found."))
/// .unwrap();
/// ```
///
/// See [`http::Response`](hyper::Response) and [`Body`] for details.
pub type ResponseBuilder = hyper::http::response::Builder;
/// The streaming body of an HTTP request or response.
///
/// Data is streamed by iterating over the body, which
/// yields chunks as [`Bytes`](hyper::body::Bytes).
///
/// ```rust
/// use astra::{Request, Response, Body};
///
/// fn handle(mut req: Request) -> Response {
/// for chunk in req.body_mut() {
/// println!("body chunk {:?}", chunk);
/// }
///
/// Response::new(Body::new("Hello World!"))
/// }
/// ```
pub struct Body(pub(crate) hyper::Body);
impl Body {
/// Create a body from a string or bytes.
///
/// ```rust
/// # use astra::Body;
/// let string = Body::new("Hello world!");
/// let bytes = Body::new(vec![0, 1, 0, 1, 0]);
/// ```
pub fn new(data: impl Into<Bytes>) -> Body {
Body(hyper::Body::from(data.into()))
}
/// Create an empty body.
pub fn empty() -> Body {
Body(hyper::Body::empty())
}
/// Create a body from an implementor of [`io::Read`].
///
/// ```rust
/// use astra::{Request, Response, ResponseBuilder, Body};
/// use std::fs::File;
///
/// fn handle(_request: Request) -> Response {
/// let file = File::open("index.html").unwrap();
///
/// ResponseBuilder::new()
/// .header("Content-Type", "text/html")
/// .body(Body::wrap_reader(file))
/// .unwrap()
/// }
/// ```
pub fn wrap_reader<R>(reader: R) -> Body
where
R: io::Read + Send + 'static,
{
Body(hyper::Body::wrap_stream(ReaderStream::new(reader)))
}
/// Create a [`BodyReader`] that implements [`std::io::Read`].
pub fn reader(&mut self) -> BodyReader<'_> {
BodyReader {
body: self,
prev_bytes: Bytes::new(),
}
}
}
impl<T> From<T> for Body
where
Bytes: From<T>,
{
fn from(data: T) -> Body {
Body::new(data)
}
}
impl Iterator for Body {
type Item = io::Result<Bytes>;
fn next(&mut self) -> Option<Self::Item> {
executor::Parker::new()
.block_on(self.0.data())
.map(|res| res.map_err(|err| io::Error::new(io::ErrorKind::Other, err)))
}
fn size_hint(&self) -> (usize, Option<usize>) {
Stream::size_hint(&self.0)
}
}
/// Wraps [`Body`] and implements [`std::io::Read`]
pub struct BodyReader<'b> {
body: &'b mut Body,
prev_bytes: Bytes,
}
impl<'b> std::io::Read for BodyReader<'b> {
fn read(&mut self, mut buf: &mut [u8]) -> io::Result<usize> {
let mut written = 0;
loop {
if buf.is_empty() {
return Ok(written);
}
if !self.prev_bytes.is_empty() {
let chunk_size = cmp::min(buf.len(), self.prev_bytes.len());
let prev_bytes_rest = self.prev_bytes.split_to(chunk_size);
buf[..chunk_size].copy_from_slice(&self.prev_bytes[..chunk_size]);
self.prev_bytes = prev_bytes_rest;
buf = &mut buf[chunk_size..];
written += chunk_size;
continue;
}
if written != 0 {
// pulling from an interator can block, and we have something to return
// already, so return it
return Ok(written);
}
debug_assert!(self.prev_bytes.is_empty());
debug_assert!(written == 0);
self.prev_bytes = if let Some(next) = self.body.next() {
next?
} else {
return Ok(written);
}
}
}
}
impl fmt::Debug for Body {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl Default for Body {
fn default() -> Self {
Self::empty()
}
}
impl HttpBody for Body {
type Data = Bytes;
type Error = hyper::Error;
fn poll_data(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Self::Data, Self::Error>>> {
Pin::new(&mut self.0).poll_data(cx)
}
fn poll_trailers(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<Option<hyper::HeaderMap>, Self::Error>> {
Pin::new(&mut self.0).poll_trailers(cx)
}
}
struct ReaderStream<R> {
reader: Option<R>,
buf: Vec<u8>,
}
const CAP: usize = 4096;
impl<R> ReaderStream<R> {
fn new(reader: R) -> Self {
Self {
reader: Some(reader),
buf: vec![0; CAP],
}
}
}
impl<R> Unpin for ReaderStream<R> {}
impl<R> Stream for ReaderStream<R>
where
R: io::Read,
{
type Item = io::Result<Bytes>;
fn poll_next(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let ReaderStream { reader, buf } = &mut *self;
let reader = match reader {
Some(reader) => reader,
None => return Poll::Ready(None),
};
if buf.capacity() == 0 {
buf.extend_from_slice(&[0; CAP]);
}
match reader.read(buf) {
Err(err) => {
self.reader.take();
Poll::Ready(Some(Err(err)))
}
Ok(0) => {
self.reader.take();
Poll::Ready(None)
}
Ok(n) => {
let remaining = buf.split_off(n);
let chunk = std::mem::replace(buf, remaining);
Poll::Ready(Some(Ok(Bytes::from(chunk))))
}
}
}
}