feat(http2): add adaptive window size support using BDP (#2138)

This adds support for calculating the Bandwidth-delay product when using
HTTP2. When a DATA frame is received, a PING is sent to the remote.
While the PING acknoledgement is outstanding, the amount of bytes of all
received DATA frames is accumulated. Once we receive the PING
acknowledgement, we calculate the BDP based on the number of received
bytes and the round-trip-time of the PING. If we are near the current
maximum window size, the size is doubled.

It's disabled by default until tested more extensively.

src/proto/h2/mod.rs

@@ -12,12 +12,16 @@ use crate::body::Payload;
 use crate::common::{task, Future, Pin, Poll};
 use crate::headers::content_length_parse_all;
 
+pub(crate) mod bdp;
 pub(crate) mod client;
 pub(crate) mod server;
 
 pub(crate) use self::client::ClientTask;
 pub(crate) use self::server::Server;
 
+/// Default initial stream window size defined in HTTP2 spec.
+pub(crate) const SPEC_WINDOW_SIZE: u32 = 65_535;
+
 fn strip_connection_headers(headers: &mut HeaderMap, is_request: bool) {
     // List of connection headers from:
     // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection