mirror of
https://github.com/actix/actix-extras.git
synced 2024-11-24 16:02:59 +01:00
463 lines
11 KiB
Rust
463 lines
11 KiB
Rust
use std::marker::PhantomData;
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use std::{fmt, mem};
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use bytes::{Bytes, BytesMut};
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use futures::{Async, Poll, Stream};
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use crate::error::Error;
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#[derive(Debug, PartialEq, Copy, Clone)]
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/// Body size hint
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pub enum BodySize {
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None,
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Empty,
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Sized(usize),
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Sized64(u64),
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Stream,
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}
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impl BodySize {
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pub fn is_eof(&self) -> bool {
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match self {
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BodySize::None
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| BodySize::Empty
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| BodySize::Sized(0)
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| BodySize::Sized64(0) => true,
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_ => false,
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}
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}
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}
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/// Type that provides this trait can be streamed to a peer.
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pub trait MessageBody {
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fn length(&self) -> BodySize;
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error>;
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}
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impl MessageBody for () {
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fn length(&self) -> BodySize {
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BodySize::Empty
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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Ok(Async::Ready(None))
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}
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}
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impl<T: MessageBody> MessageBody for Box<T> {
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fn length(&self) -> BodySize {
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self.as_ref().length()
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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self.as_mut().poll_next()
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}
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}
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pub enum ResponseBody<B> {
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Body(B),
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Other(Body),
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}
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impl ResponseBody<Body> {
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pub fn into_body<B>(self) -> ResponseBody<B> {
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match self {
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ResponseBody::Body(b) => ResponseBody::Other(b),
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ResponseBody::Other(b) => ResponseBody::Other(b),
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}
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}
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}
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impl<B> ResponseBody<B> {
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pub fn take_body(&mut self) -> ResponseBody<B> {
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std::mem::replace(self, ResponseBody::Other(Body::None))
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}
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}
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impl<B: MessageBody> ResponseBody<B> {
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pub fn as_ref(&self) -> Option<&B> {
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if let ResponseBody::Body(ref b) = self {
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Some(b)
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} else {
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None
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}
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}
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}
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impl<B: MessageBody> MessageBody for ResponseBody<B> {
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fn length(&self) -> BodySize {
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match self {
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ResponseBody::Body(ref body) => body.length(),
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ResponseBody::Other(ref body) => body.length(),
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}
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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match self {
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ResponseBody::Body(ref mut body) => body.poll_next(),
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ResponseBody::Other(ref mut body) => body.poll_next(),
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}
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}
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}
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impl<B: MessageBody> Stream for ResponseBody<B> {
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type Item = Bytes;
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type Error = Error;
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fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
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self.poll_next()
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}
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}
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/// Represents various types of http message body.
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pub enum Body {
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/// Empty response. `Content-Length` header is not set.
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None,
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/// Zero sized response body. `Content-Length` header is set to `0`.
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Empty,
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/// Specific response body.
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Bytes(Bytes),
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/// Generic message body.
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Message(Box<dyn MessageBody>),
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}
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impl Body {
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/// Create body from slice (copy)
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pub fn from_slice(s: &[u8]) -> Body {
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Body::Bytes(Bytes::from(s))
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}
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/// Create body from generic message body.
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pub fn from_message<B: MessageBody + 'static>(body: B) -> Body {
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Body::Message(Box::new(body))
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}
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}
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impl MessageBody for Body {
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fn length(&self) -> BodySize {
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match self {
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Body::None => BodySize::None,
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Body::Empty => BodySize::Empty,
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Body::Bytes(ref bin) => BodySize::Sized(bin.len()),
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Body::Message(ref body) => body.length(),
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}
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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match self {
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Body::None => Ok(Async::Ready(None)),
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Body::Empty => Ok(Async::Ready(None)),
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Body::Bytes(ref mut bin) => {
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let len = bin.len();
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if len == 0 {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(bin.split_to(len))))
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}
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}
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Body::Message(ref mut body) => body.poll_next(),
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}
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}
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}
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impl PartialEq for Body {
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fn eq(&self, other: &Body) -> bool {
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match *self {
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Body::None => match *other {
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Body::None => true,
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_ => false,
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},
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Body::Empty => match *other {
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Body::Empty => true,
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_ => false,
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},
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Body::Bytes(ref b) => match *other {
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Body::Bytes(ref b2) => b == b2,
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_ => false,
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},
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Body::Message(_) => false,
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}
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}
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}
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impl fmt::Debug for Body {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Body::None => write!(f, "Body::None"),
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Body::Empty => write!(f, "Body::Zero"),
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Body::Bytes(ref b) => write!(f, "Body::Bytes({:?})", b),
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Body::Message(_) => write!(f, "Body::Message(_)"),
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}
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}
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}
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impl From<&'static str> for Body {
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fn from(s: &'static str) -> Body {
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Body::Bytes(Bytes::from_static(s.as_ref()))
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}
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}
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impl From<&'static [u8]> for Body {
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fn from(s: &'static [u8]) -> Body {
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Body::Bytes(Bytes::from_static(s))
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}
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}
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impl From<Vec<u8>> for Body {
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fn from(vec: Vec<u8>) -> Body {
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Body::Bytes(Bytes::from(vec))
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}
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}
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impl From<String> for Body {
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fn from(s: String) -> Body {
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s.into_bytes().into()
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}
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}
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impl<'a> From<&'a String> for Body {
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fn from(s: &'a String) -> Body {
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Body::Bytes(Bytes::from(AsRef::<[u8]>::as_ref(&s)))
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}
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}
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impl From<Bytes> for Body {
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fn from(s: Bytes) -> Body {
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Body::Bytes(s)
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}
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}
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impl From<BytesMut> for Body {
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fn from(s: BytesMut) -> Body {
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Body::Bytes(s.freeze())
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}
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}
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impl MessageBody for Bytes {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(mem::replace(self, Bytes::new()))))
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}
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}
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}
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impl MessageBody for BytesMut {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(
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mem::replace(self, BytesMut::new()).freeze(),
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)))
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}
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}
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}
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impl MessageBody for &'static str {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(Bytes::from_static(
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mem::replace(self, "").as_ref(),
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))))
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}
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}
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}
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impl MessageBody for &'static [u8] {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(Bytes::from_static(mem::replace(
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self, b"",
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)))))
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}
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}
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}
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impl MessageBody for Vec<u8> {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(Bytes::from(mem::replace(
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self,
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Vec::new(),
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)))))
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}
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}
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}
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impl MessageBody for String {
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fn length(&self) -> BodySize {
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BodySize::Sized(self.len())
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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if self.is_empty() {
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Ok(Async::Ready(None))
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} else {
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Ok(Async::Ready(Some(Bytes::from(
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mem::replace(self, String::new()).into_bytes(),
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))))
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}
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}
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}
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/// Type represent streaming body.
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/// Response does not contain `content-length` header and appropriate transfer encoding is used.
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pub struct BodyStream<S, E> {
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stream: S,
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_t: PhantomData<E>,
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}
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impl<S, E> BodyStream<S, E>
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where
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S: Stream<Item = Bytes, Error = E>,
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E: Into<Error>,
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{
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pub fn new(stream: S) -> Self {
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BodyStream {
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stream,
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_t: PhantomData,
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}
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}
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}
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impl<S, E> MessageBody for BodyStream<S, E>
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where
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S: Stream<Item = Bytes, Error = E>,
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E: Into<Error>,
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{
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fn length(&self) -> BodySize {
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BodySize::Stream
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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self.stream.poll().map_err(|e| e.into())
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}
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}
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/// Type represent streaming body. This body implementation should be used
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/// if total size of stream is known. Data get sent as is without using transfer encoding.
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pub struct SizedStream<S> {
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size: usize,
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stream: S,
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}
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impl<S> SizedStream<S>
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where
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S: Stream<Item = Bytes, Error = Error>,
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{
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pub fn new(size: usize, stream: S) -> Self {
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SizedStream { size, stream }
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}
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}
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impl<S> MessageBody for SizedStream<S>
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where
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S: Stream<Item = Bytes, Error = Error>,
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{
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fn length(&self) -> BodySize {
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BodySize::Sized(self.size)
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}
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fn poll_next(&mut self) -> Poll<Option<Bytes>, Error> {
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self.stream.poll()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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impl Body {
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pub(crate) fn get_ref(&self) -> &[u8] {
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match *self {
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Body::Bytes(ref bin) => &bin,
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_ => panic!(),
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}
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}
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}
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impl ResponseBody<Body> {
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pub(crate) fn get_ref(&self) -> &[u8] {
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match *self {
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ResponseBody::Body(ref b) => b.get_ref(),
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ResponseBody::Other(ref b) => b.get_ref(),
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}
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}
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}
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#[test]
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fn test_static_str() {
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assert_eq!(Body::from("").length(), BodySize::Sized(0));
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assert_eq!(Body::from("test").length(), BodySize::Sized(4));
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assert_eq!(Body::from("test").get_ref(), b"test");
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}
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#[test]
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fn test_static_bytes() {
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assert_eq!(Body::from(b"test".as_ref()).length(), BodySize::Sized(4));
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assert_eq!(Body::from(b"test".as_ref()).get_ref(), b"test");
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assert_eq!(
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Body::from_slice(b"test".as_ref()).length(),
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BodySize::Sized(4)
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);
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assert_eq!(Body::from_slice(b"test".as_ref()).get_ref(), b"test");
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}
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#[test]
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fn test_vec() {
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assert_eq!(Body::from(Vec::from("test")).length(), BodySize::Sized(4));
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assert_eq!(Body::from(Vec::from("test")).get_ref(), b"test");
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}
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#[test]
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fn test_bytes() {
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assert_eq!(Body::from(Bytes::from("test")).length(), BodySize::Sized(4));
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assert_eq!(Body::from(Bytes::from("test")).get_ref(), b"test");
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}
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#[test]
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fn test_string() {
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let b = "test".to_owned();
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assert_eq!(Body::from(b.clone()).length(), BodySize::Sized(4));
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assert_eq!(Body::from(b.clone()).get_ref(), b"test");
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assert_eq!(Body::from(&b).length(), BodySize::Sized(4));
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assert_eq!(Body::from(&b).get_ref(), b"test");
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}
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#[test]
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fn test_bytes_mut() {
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let b = BytesMut::from("test");
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assert_eq!(Body::from(b.clone()).length(), BodySize::Sized(4));
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assert_eq!(Body::from(b).get_ref(), b"test");
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}
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}
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