leyline-http 0.1.1

HTTP client that mimics browsers on the wire
Documentation 
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use std::fmt;
use std::io;
use std::pin::Pin;
use std::task::{Context, Poll};

use bytes::Bytes;
use futures_util::Stream;

pub(crate) type BoxedStream = Pin<Box<dyn Stream<Item = io::Result<Bytes>> + Send + 'static>>;

#[derive(Default)]
pub(crate) enum BodyKind {
    #[default]
    Empty,
    Bytes(Bytes),
    Stream {
        stream: BoxedStream,
        length_hint: Option<u64>,
    },
}

#[derive(Default)]
pub struct Body(pub(crate) BodyKind);

impl fmt::Debug for Body {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut out = f.debug_struct("Body");
        match &self.0 {
            BodyKind::Empty => out.field("kind", &"empty"),
            BodyKind::Bytes(b) => out.field("kind", &"bytes").field("len", &b.len()),
            BodyKind::Stream { length_hint, .. } => out
                .field("kind", &"stream")
                .field("length_hint", length_hint),
        }
        .finish()
    }
}

impl Stream for Body {
    type Item = io::Result<Bytes>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        match &mut self.0 {
            BodyKind::Empty => Poll::Ready(None),
            BodyKind::Bytes(_) => match std::mem::take(&mut self.0) {
                BodyKind::Bytes(b) => Poll::Ready(Some(Ok(b))),
                _ => Poll::Ready(None),
            },
            BodyKind::Stream { stream, .. } => stream.as_mut().poll_next(cx),
        }
    }
}

impl Body {
    pub(crate) fn bytes(bytes: Bytes) -> Self {
        Body(BodyKind::Bytes(bytes))
    }

    pub fn stream<S>(stream: S, length: Option<u64>) -> Self
    where
        S: Stream<Item = io::Result<Bytes>> + Send + 'static,
    {
        Body(BodyKind::Stream {
            stream: Box::pin(stream),
            length_hint: length,
        })
    }

    pub fn len_hint(&self) -> Option<u64> {
        match &self.0 {
            BodyKind::Empty => Some(0),
            BodyKind::Bytes(b) => Some(b.len() as u64),
            BodyKind::Stream { length_hint, .. } => *length_hint,
        }
    }

    #[cfg(feature = "http3")]
    pub(crate) fn is_stream(&self) -> bool {
        matches!(self.0, BodyKind::Stream { .. })
    }

    #[cfg(feature = "http3")]
    pub(crate) fn into_parts(self) -> (Option<Bytes>, Option<BoxedStream>) {
        match self.0 {
            BodyKind::Empty => (None, None),
            BodyKind::Bytes(b) => (Some(b), None),
            BodyKind::Stream { stream, .. } => (None, Some(stream)),
        }
    }

    pub(crate) fn into_h2(self) -> crate::h2::client::RequestBody {
        use crate::h2::client::RequestBody;
        match self.0 {
            BodyKind::Empty => RequestBody::None,
            BodyKind::Bytes(b) => RequestBody::Buffered(b),
            BodyKind::Stream {
                stream,
                length_hint,
            } => RequestBody::Streaming {
                stream,
                length_hint,
            },
        }
    }

    pub(crate) fn replay(&self) -> Option<Body> {
        match &self.0 {
            BodyKind::Empty => Some(Body::default()),
            BodyKind::Bytes(b) => Some(Body::bytes(b.clone())),
            BodyKind::Stream { .. } => None,
        }
    }
}

impl From<Bytes> for Body {
    fn from(b: Bytes) -> Self {
        if b.is_empty() {
            Body::default()
        } else {
            Body::bytes(b)
        }
    }
}

impl From<Vec<u8>> for Body {
    fn from(v: Vec<u8>) -> Self {
        Body::from(Bytes::from(v))
    }
}

impl From<&'static [u8]> for Body {
    fn from(v: &'static [u8]) -> Self {
        Body::from(Bytes::from_static(v))
    }
}

impl From<String> for Body {
    fn from(s: String) -> Self {
        Body::from(Bytes::from(s.into_bytes()))
    }
}

impl From<&'static str> for Body {
    fn from(s: &'static str) -> Self {
        Body::from(Bytes::from_static(s.as_bytes()))
    }
}

impl From<()> for Body {
    fn from(_: ()) -> Self {
        Body::default()
    }
}

#[cfg(test)]
mod tests;