# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1644923554 -10800
# Node ID e5f16d886c97c4d7fda6a8fb6da634b9d95081ba
# Parent  ce6d9cf0f567979e85ea6ab781bb9184340279e3
QUIC: optimized datagram expansion with half-RTT tickets.

As shown in RFC 8446, section 2.2, Figure 3, and further specified in
section 4.6.1, BoringSSL releases session tickets in Application Data
(along with Finished) early, based on a precalculated client Finished
transcript, once client signalled early data in extensions.

diff -r ce6d9cf0f567 -r e5f16d886c97 src/event/quic/ngx_event_quic_output.c
--- a/src/event/quic/ngx_event_quic_output.c	Mon Feb 14 10:14:07 2022 +0300
+++ b/src/event/quic/ngx_event_quic_output.c	Tue Feb 15 14:12:34 2022 +0300
@@ -476,6 +476,7 @@
 static ngx_uint_t
 ngx_quic_get_padding_level(ngx_connection_t *c)
 {
+    ngx_uint_t              i;
     ngx_queue_t            *q;
     ngx_quic_frame_t       *f;
     ngx_quic_send_ctx_t    *ctx;
@@ -499,13 +500,15 @@
         f = ngx_queue_data(q, ngx_quic_frame_t, queue);
 
         if (f->need_ack) {
-            ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_handshake);
+            for (i = 0; i + 1 < NGX_QUIC_SEND_CTX_LAST; i++) {
+                ctx = &qc->send_ctx[i + 1];
 
-            if (ngx_queue_empty(&ctx->frames)) {
-                return 0;
+                if (ngx_queue_empty(&ctx->frames)) {
+                    break;
+                }
             }
 
-            return 1;
+            return i;
         }
     }