# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1613561107 -10800
# Node ID d710c457171c5f76aa9980c4238ec80c57a945b2
# Parent  d4e02b3b734fe15cdb17dde6874145878fd6f09d
QUIC: added ability to reset a stream.

diff --git a/src/event/quic/ngx_event_quic.c b/src/event/quic/ngx_event_quic.c
--- a/src/event/quic/ngx_event_quic.c
+++ b/src/event/quic/ngx_event_quic.c
@@ -2203,6 +2203,40 @@ ngx_quic_close_streams(ngx_connection_t 
 }
 
 
+ngx_int_t
+ngx_quic_reset_stream(ngx_connection_t *c, ngx_uint_t err)
+{
+    ngx_event_t            *wev;
+    ngx_connection_t       *pc;
+    ngx_quic_frame_t       *frame;
+    ngx_quic_stream_t      *qs;
+    ngx_quic_connection_t  *qc;
+
+    qs = c->quic;
+    pc = qs->parent;
+    qc = ngx_quic_get_connection(pc);
+
+    frame = ngx_quic_alloc_frame(pc);
+    if (frame == NULL) {
+        return NGX_ERROR;
+    }
+
+    frame->level = ssl_encryption_application;
+    frame->type = NGX_QUIC_FT_RESET_STREAM;
+    frame->u.reset_stream.id = qs->id;
+    frame->u.reset_stream.error_code = err;
+    frame->u.reset_stream.final_size = c->sent;
+
+    ngx_quic_queue_frame(qc, frame);
+
+    wev = c->write;
+    wev->error = 1;
+    wev->ready = 1;
+
+    return NGX_OK;
+}
+
+
 static ngx_int_t
 ngx_quic_input(ngx_connection_t *c, ngx_buf_t *b, ngx_quic_conf_t *conf)
 {
@@ -6408,6 +6442,10 @@ ngx_quic_stream_cleanup_handler(void *da
         }
     }
 
+    if (c->write->error) {
+        goto error;
+    }
+
     ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                    "quic stream id:0x%xL send fin", qs->id);
 
@@ -6429,6 +6467,8 @@ ngx_quic_stream_cleanup_handler(void *da
 
     ngx_quic_queue_frame(qc, frame);
 
+error:
+
     (void) ngx_quic_output(pc);
 }
 
diff --git a/src/event/quic/ngx_event_quic.h b/src/event/quic/ngx_event_quic.h
--- a/src/event/quic/ngx_event_quic.h
+++ b/src/event/quic/ngx_event_quic.h
@@ -131,6 +131,7 @@ void ngx_quic_run(ngx_connection_t *c, n
 ngx_connection_t *ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi);
 void ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err,
     const char *reason);
+ngx_int_t ngx_quic_reset_stream(ngx_connection_t *c, ngx_uint_t err);
 uint32_t ngx_quic_version(ngx_connection_t *c);
 ngx_int_t ngx_quic_get_packet_dcid(ngx_log_t *log, u_char *data, size_t len,
     ngx_str_t *dcid);
diff --git a/src/event/quic/ngx_event_quic_transport.c b/src/event/quic/ngx_event_quic_transport.c
--- a/src/event/quic/ngx_event_quic_transport.c
+++ b/src/event/quic/ngx_event_quic_transport.c
@@ -96,6 +96,8 @@ static ngx_int_t ngx_quic_frame_allowed(
 static size_t ngx_quic_create_ping(u_char *p);
 static size_t ngx_quic_create_ack(u_char *p, ngx_quic_ack_frame_t *ack,
     ngx_chain_t *ranges);
+static size_t ngx_quic_create_reset_stream(u_char *p,
+    ngx_quic_reset_stream_frame_t *rs);
 static size_t ngx_quic_create_stop_sending(u_char *p,
     ngx_quic_stop_sending_frame_t *ss);
 static size_t ngx_quic_create_crypto(u_char *p,
@@ -1228,6 +1230,9 @@ ngx_quic_create_frame(u_char *p, ngx_qui
         f->need_ack = 0;
         return ngx_quic_create_ack(p, &f->u.ack, f->data);
 
+    case NGX_QUIC_FT_RESET_STREAM:
+        return ngx_quic_create_reset_stream(p, &f->u.reset_stream);
+
     case NGX_QUIC_FT_STOP_SENDING:
         return ngx_quic_create_stop_sending(p, &f->u.stop_sending);
 
@@ -1334,6 +1339,31 @@ ngx_quic_create_ack(u_char *p, ngx_quic_
 
 
 static size_t
+ngx_quic_create_reset_stream(u_char *p, ngx_quic_reset_stream_frame_t *rs)
+{
+    size_t   len;
+    u_char  *start;
+
+    if (p == NULL) {
+        len = ngx_quic_varint_len(NGX_QUIC_FT_RESET_STREAM);
+        len += ngx_quic_varint_len(rs->id);
+        len += ngx_quic_varint_len(rs->error_code);
+        len += ngx_quic_varint_len(rs->final_size);
+        return len;
+    }
+
+    start = p;
+
+    ngx_quic_build_int(&p, NGX_QUIC_FT_RESET_STREAM);
+    ngx_quic_build_int(&p, rs->id);
+    ngx_quic_build_int(&p, rs->error_code);
+    ngx_quic_build_int(&p, rs->final_size);
+
+    return p - start;
+}
+
+
+static size_t
 ngx_quic_create_stop_sending(u_char *p, ngx_quic_stop_sending_frame_t *ss)
 {
     size_t   len;