sark-core 0.9.0

the L7 layer for dope
Documentation 
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use http::StatusCode;
use o3::buffer::{Owned, Shared};

use super::wire_emit::{ContentLength, HeadWrite, Out, PLACEHOLDER_DATE};
use super::{DEFAULT_HEADER_CAPACITY, HeadInner, HeadersInner};

/// A response whose body is guaranteed to live for the entire process.
///
/// Keeping the static slice directly avoids paying for the largest variant of
/// `HotBodyInner` on generated static-response routes.
#[derive(Clone, Debug)]
pub struct StaticResponseInner<'req, const N: usize = DEFAULT_HEADER_CAPACITY> {
    status: StatusCode,
    head: HeadInner<'req, N>,
    body: &'static [u8],
}

impl<'req, const N: usize> StaticResponseInner<'req, N> {
    pub fn direct(
        status: StatusCode,
        static_headers: &'static [u8],
        headers: HeadersInner<'req, N>,
        body: &'static [u8],
    ) -> Self {
        Self {
            status,
            head: HeadInner::new(static_headers, headers),
            body,
        }
    }

    pub fn status(&self) -> StatusCode {
        self.status
    }

    pub fn body_ref(&self) -> &'static [u8] {
        self.body
    }

    pub fn wire_headers(&self) -> Shared {
        let mut out = Owned::with_capacity(self.head.wire_len());
        self.head.write_into_owned(&mut out);
        out.freeze()
    }

    fn head_write(&self) -> HeadWrite<'_, HeadInner<'req, N>, ContentLength> {
        HeadWrite {
            status_str: self.status.as_str().as_bytes(),
            reason: self
                .status
                .canonical_reason()
                .map(str::as_bytes)
                .unwrap_or(b""),
            headers: &self.head,
            framing: ContentLength(self.body.len()),
        }
    }

    pub fn write_into_slice(&self, out: &mut [u8], date: &[u8; 29]) -> Option<usize> {
        let head = self.head_write();
        let total = head.wire_len().checked_add(self.body.len())?;
        if out.len() < total {
            return None;
        }
        let mut off = 0usize;
        head.write(out, &mut off, date);
        Out::put(out, &mut off, self.body);
        Some(off)
    }

    pub fn write_head_only(
        &self,
        out: &mut [u8],
        date: &[u8; 29],
    ) -> Option<(usize, &'static [u8])> {
        let head = self.head_write();
        if out.len() < head.wire_len() {
            return None;
        }
        let mut off = 0usize;
        head.write(out, &mut off, date);
        Some((off, self.body))
    }

    pub fn write_head_split(self, out: &mut [u8], date: &[u8; 29]) -> Option<(usize, Shared)> {
        let (off, body) = self.write_head_only(out, date)?;
        Some((off, Shared::from_static(body)))
    }

    pub fn preserialize_static(&self) -> (Vec<u8>, usize, &'static [u8]) {
        let head = self.head_write();
        let mut out = vec![0u8; head.wire_len()];
        let mut off = 0usize;
        let date_offset = head.write(&mut out, &mut off, PLACEHOLDER_DATE);
        (out, date_offset, self.body)
    }
}