121 lines
3.4 KiB
Rust
121 lines
3.4 KiB
Rust
use http::HeaderMap;
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/// A frame of any kind related to an HTTP stream (body).
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#[derive(Debug)]
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pub struct Frame<T> {
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kind: Kind<T>,
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}
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#[derive(Debug)]
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enum Kind<T> {
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// The first two variants are "inlined" since they are undoubtedly
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// the most common. This saves us from having to allocate a
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// boxed trait object for them.
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Data(T),
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Trailers(HeaderMap),
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//Unknown(Box<dyn Frameish>),
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}
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impl<T> Frame<T> {
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/// Create a DATA frame with the provided `Buf`.
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pub fn data(buf: T) -> Self {
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Self {
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kind: Kind::Data(buf),
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}
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}
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/// Create a trailers frame.
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pub fn trailers(map: HeaderMap) -> Self {
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Self {
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kind: Kind::Trailers(map),
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}
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}
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/// Maps this frame's data to a different type.
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pub fn map_data<F, D>(self, f: F) -> Frame<D>
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where
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F: FnOnce(T) -> D,
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{
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match self.kind {
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Kind::Data(data) => Frame {
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kind: Kind::Data(f(data)),
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},
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Kind::Trailers(trailers) => Frame {
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kind: Kind::Trailers(trailers),
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},
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}
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}
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/// Returns whether this is a DATA frame.
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pub fn is_data(&self) -> bool {
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matches!(self.kind, Kind::Data(..))
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}
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/// Consumes self into the buf of the DATA frame.
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///
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/// Returns an [`Err`] containing the original [`Frame`] when frame is not a DATA frame.
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/// `Frame::is_data` can also be used to determine if the frame is a DATA frame.
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pub fn into_data(self) -> Result<T, Self> {
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match self.kind {
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Kind::Data(data) => Ok(data),
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_ => Err(self),
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}
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}
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/// If this is a DATA frame, returns a reference to it.
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///
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/// Returns `None` if not a DATA frame.
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pub fn data_ref(&self) -> Option<&T> {
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match self.kind {
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Kind::Data(ref data) => Some(data),
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_ => None,
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}
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}
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/// If this is a DATA frame, returns a mutable reference to it.
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///
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/// Returns `None` if not a DATA frame.
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pub fn data_mut(&mut self) -> Option<&mut T> {
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match self.kind {
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Kind::Data(ref mut data) => Some(data),
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_ => None,
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}
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}
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/// Returns whether this is a trailers frame.
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pub fn is_trailers(&self) -> bool {
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matches!(self.kind, Kind::Trailers(..))
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}
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/// Consumes self into the buf of the trailers frame.
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///
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/// Returns an [`Err`] containing the original [`Frame`] when frame is not a trailers frame.
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/// `Frame::is_trailers` can also be used to determine if the frame is a trailers frame.
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pub fn into_trailers(self) -> Result<HeaderMap, Self> {
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match self.kind {
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Kind::Trailers(trailers) => Ok(trailers),
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_ => Err(self),
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}
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}
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/// If this is a trailers frame, returns a reference to it.
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///
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/// Returns `None` if not a trailers frame.
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pub fn trailers_ref(&self) -> Option<&HeaderMap> {
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match self.kind {
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Kind::Trailers(ref trailers) => Some(trailers),
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_ => None,
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}
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}
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/// If this is a trailers frame, returns a mutable reference to it.
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///
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/// Returns `None` if not a trailers frame.
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pub fn trailers_mut(&mut self) -> Option<&mut HeaderMap> {
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match self.kind {
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Kind::Trailers(ref mut trailers) => Some(trailers),
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_ => None,
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}
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}
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}
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