dope 0.3.2

The manifold runtime
Documentation 
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use dope::transport::link::egress::Queue;
use o3::buffer::Shared;

fn iov_bytes(q: &mut Queue<8>) -> Vec<u8> {
    let v = q.prepare_send(u32::MAX as usize);
    let mut out = Vec::new();
    for iov in v.iovs {
        let slice =
            // SAFETY: iov points into Shared buffers owned by the queue, alive for this borrow.
            unsafe { std::slice::from_raw_parts(iov.as_ptr(), iov.len()) };
        out.extend_from_slice(slice);
    }
    out
}

#[test]
fn back_to_back_push_preserves_all_chunks() {
    let mut q: Queue<8> = Queue::new();
    q.push(Shared::copy_from_slice(b"AAAA"));
    q.push(Shared::copy_from_slice(b"BBBB"));
    assert_eq!(q.total_bytes(), 8);
    assert_eq!(iov_bytes(&mut q), b"AAAABBBB");
}

#[test]
fn ack_partial_then_remaining_preserved() {
    let mut q: Queue<8> = Queue::new();
    q.push(Shared::copy_from_slice(b"AAAA"));
    q.push(Shared::copy_from_slice(b"BBBB"));
    q.ack(6);
    assert_eq!(q.total_bytes(), 2);
    assert_eq!(iov_bytes(&mut q), b"BB");
    q.ack(2);
    assert_eq!(q.total_bytes(), 0);
    assert!(iov_bytes(&mut q).is_empty());
}

#[test]
fn many_chunks_drain_in_order() {
    let mut q: Queue<8> = Queue::new();
    for i in 0..6u8 {
        q.push(Shared::copy_from_slice(&[b'0' + i; 3]));
    }
    assert_eq!(q.total_bytes(), 18);
    let mut acc = Vec::new();
    while q.total_bytes() > 0 {
        let chunk = iov_bytes(&mut q);
        assert!(!chunk.is_empty());
        let take = chunk.len().min(4);
        acc.extend_from_slice(&chunk[..take]);
        q.ack(take);
    }
    assert_eq!(acc, b"000111222333444555");
}