Struct StreamParts 

pub struct StreamParts<'a> {
    pub window: &'a mut i32,
    pub rbuffer: &'a mut Kawa<Checkout>,
    pub wbuffer: &'a mut Kawa<Checkout>,
    pub received_end_of_stream: &'a mut bool,
    pub data_received: &'a mut usize,
    pub context: &'a mut HttpContext,
    pub metrics: &'a mut SessionMetrics,
    pub retry_buffer: &'a mut Option<ReplayCapture>,
    pub front_bound_to_backend: &'a mut bool,
}

This struct allows to mutably borrow the read and write buffers (dependant on the position) as well as the context and metrics of a Stream at the same time

Fields

window: &'a mut i32

This connection’s send window for the stream: Stream::back_window on a backend connection, Stream::front_window on a frontend one.

rbuffer: &'a mut Kawa<Checkout>

wbuffer: &'a mut Kawa<Checkout>

received_end_of_stream: &'a mut bool

Tracks whether end_of_stream has been received on the read side of this connection.

data_received: &'a mut usize

Tracks total DATA payload bytes received on the read side (for content-length validation).

context: &'a mut HttpContext

metrics: &'a mut SessionMetrics

retry_buffer: &'a mut Option<ReplayCapture>

Stream::retry_buffer, reachable from the write path so the H1 client can record the exact bytes it hands the upstream socket before kawa::Kawa::consume drops them from the front buffer.

front_bound_to_backend: &'a mut bool

Stream::front_bound_to_backend, set by the H2 write path when a backend connection encodes the request.