# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1615825564 -10800
# Node ID 265062a99043ea85394cf738785520d282199cc0
# Parent  7a07724256c26c42b1456adfbdcd47efd3d5659e
HTTP/3: send GOAWAY when last request is accepted.

The last request in connection is determined according to the keepalive_requests
directive.  Requests beyond keepalive_requests are rejected.

diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
--- a/src/http/v3/ngx_http_v3.h
+++ b/src/http/v3/ngx_http_v3.h
@@ -161,6 +161,7 @@ ngx_int_t ngx_http_v3_init_session(ngx_c
 void ngx_http_v3_init_uni_stream(ngx_connection_t *c);
 ngx_connection_t *ngx_http_v3_create_push_stream(ngx_connection_t *c,
     uint64_t push_id);
+ngx_int_t ngx_http_v3_send_goaway(ngx_connection_t *c, uint64_t id);
 ngx_int_t ngx_http_v3_ref_insert(ngx_connection_t *c, ngx_uint_t dynamic,
     ngx_uint_t index, ngx_str_t *value);
 ngx_int_t ngx_http_v3_insert(ngx_connection_t *c, ngx_str_t *name,
diff --git a/src/http/v3/ngx_http_v3_request.c b/src/http/v3/ngx_http_v3_request.c
--- a/src/http/v3/ngx_http_v3_request.c
+++ b/src/http/v3/ngx_http_v3_request.c
@@ -52,10 +52,12 @@ void
 ngx_http_v3_init(ngx_connection_t *c)
 {
     size_t                     size;
+    uint64_t                   n;
     ngx_buf_t                 *b;
     ngx_event_t               *rev;
     ngx_http_request_t        *r;
     ngx_http_connection_t     *hc;
+    ngx_http_core_loc_conf_t  *clcf;
     ngx_http_core_srv_conf_t  *cscf;
 
     if (ngx_http_v3_init_session(c) != NGX_OK) {
@@ -74,6 +76,25 @@ ngx_http_v3_init(ngx_connection_t *c)
 
     hc = c->data;
 
+    clcf = ngx_http_get_module_loc_conf(hc->conf_ctx, ngx_http_core_module);
+
+    n = c->quic->id >> 2;
+
+    if (n >= clcf->keepalive_requests) {
+        ngx_quic_reset_stream(c, NGX_HTTP_V3_ERR_REQUEST_REJECTED);
+        ngx_http_close_connection(c);
+        return;
+    }
+
+    if (n + 1 == clcf->keepalive_requests) {
+        if (ngx_http_v3_send_goaway(c, (n + 1) << 2) != NGX_OK) {
+            ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
+                                            "goaway error");
+            ngx_http_close_connection(c);
+            return;
+        }
+    }
+
     cscf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_core_module);
 
     size = cscf->client_header_buffer_size;
diff --git a/src/http/v3/ngx_http_v3_streams.c b/src/http/v3/ngx_http_v3_streams.c
--- a/src/http/v3/ngx_http_v3_streams.c
+++ b/src/http/v3/ngx_http_v3_streams.c
@@ -523,6 +523,40 @@ failed:
 
 
 ngx_int_t
+ngx_http_v3_send_goaway(ngx_connection_t *c, uint64_t id)
+{
+    u_char            *p, buf[NGX_HTTP_V3_VARLEN_INT_LEN * 3];
+    size_t             n;
+    ngx_connection_t  *cc;
+
+    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 send goaway %uL", id);
+
+    cc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_CONTROL);
+    if (cc == NULL) {
+        return NGX_DECLINED;
+    }
+
+    n = ngx_http_v3_encode_varlen_int(NULL, id);
+    p = (u_char *) ngx_http_v3_encode_varlen_int(buf, NGX_HTTP_V3_FRAME_GOAWAY);
+    p = (u_char *) ngx_http_v3_encode_varlen_int(p, n);
+    p = (u_char *) ngx_http_v3_encode_varlen_int(p, id);
+    n = p - buf;
+
+    if (cc->send(cc, buf, n) != (ssize_t) n) {
+        goto failed;
+    }
+
+    return NGX_OK;
+
+failed:
+
+    ngx_http_v3_close_uni_stream(cc);
+
+    return NGX_ERROR;
+}
+
+
+ngx_int_t
 ngx_http_v3_client_ref_insert(ngx_connection_t *c, ngx_uint_t dynamic,
     ngx_uint_t index, ngx_str_t *value)
 {