Function capnp_futures::serialize_packed::try_read_message

pub async fn try_read_message<R>(
    read: R,
    options: ReaderOptions
) -> Result<Option<Reader<OwnedSegments>>>
where
    R: AsyncRead + Unpin,

Asynchronously reads a packed message from read. Returns None if read has zero bytes left (i.e. is at end-of-file). To read a stream containing an unknown number of messages, you could call this function repeatedly until it returns None.