QUIC: idle mode for main connection.

Now main QUIC connection for HTTP/3 always has c->idle flag set.  This allows
the connection to receive worker shutdown notification.  It is passed to
application level via a new conf->shutdown() callback.

The HTTP/3 shutdown callback sends GOAWAY to client and gracefully shuts down
the QUIC connection.

3 files changed, 38 insertions, 1 deletions

diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
index 7ffd38768..818ca2bf5 100644
--- a/src/http/v3/ngx_http_v3.h
+++ b/src/http/v3/ngx_http_v3.h
@@ -141,6 +141,7 @@ struct ngx_http_v3_session_s {
     uint64_t                      next_push_id;
     uint64_t                      max_push_id;
     uint64_t                      goaway_push_id;
+    uint64_t                      next_request_id;
 
     off_t                         total_bytes;
     off_t                         payload_bytes;
@@ -158,6 +159,7 @@ void ngx_http_v3_init(ngx_connection_t *c);
 void ngx_http_v3_reset_connection(ngx_connection_t *c);
 ngx_int_t ngx_http_v3_init_session(ngx_connection_t *c);
 ngx_int_t ngx_http_v3_check_flood(ngx_connection_t *c);
+void ngx_http_v3_shutdown(ngx_connection_t *c);
 
 ngx_int_t ngx_http_v3_read_request_body(ngx_http_request_t *r);
 ngx_int_t ngx_http_v3_read_unbuffered_request_body(ngx_http_request_t *r);
diff --git a/src/http/v3/ngx_http_v3_module.c b/src/http/v3/ngx_http_v3_module.c
index d274a3bf2..d87a1c9ef 100644
--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -249,6 +249,8 @@ ngx_http_v3_create_srv_conf(ngx_conf_t *cf)
     h3scf->quic.stream_reject_code_bidi = NGX_HTTP_V3_ERR_REQUEST_REJECTED;
     h3scf->quic.active_connection_id_limit = NGX_CONF_UNSET_UINT;
 
+    h3scf->quic.shutdown = ngx_http_v3_shutdown;
+
     return h3scf;
 }
 
diff --git a/src/http/v3/ngx_http_v3_request.c b/src/http/v3/ngx_http_v3_request.c
index bdb5331fe..c75bc19c5 100644
--- a/src/http/v3/ngx_http_v3_request.c
+++ b/src/http/v3/ngx_http_v3_request.c
@@ -100,6 +100,37 @@ ngx_http_v3_init(ngx_connection_t *c)
 }
 
 
+void
+ngx_http_v3_shutdown(ngx_connection_t *c)
+{
+    ngx_http_v3_session_t  *h3c;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 shutdown");
+
+    h3c = ngx_http_v3_get_session(c);
+
+    if (h3c == NULL) {
+        ngx_quic_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
+                                     "connection shutdown");
+        return;
+    }
+
+    if (!h3c->goaway) {
+        h3c->goaway = 1;
+
+#if (NGX_HTTP_V3_HQ)
+        if (!h3c->hq)
+#endif
+        {
+            (void) ngx_http_v3_send_goaway(c, h3c->next_request_id);
+        }
+
+        ngx_http_v3_shutdown_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
+                                        "connection shutdown");
+    }
+}
+
+
 static void
 ngx_http_v3_init_request_stream(ngx_connection_t *c)
 {
@@ -140,6 +171,8 @@ ngx_http_v3_init_request_stream(ngx_connection_t *c)
 
     pc = c->quic->parent;
 
+    h3c->next_request_id = c->quic->id + 0x04;
+
     if (n + 1 == clcf->keepalive_requests
         || ngx_current_msec - pc->start_time > clcf->keepalive_time)
     {
@@ -149,7 +182,7 @@ ngx_http_v3_init_request_stream(ngx_connection_t *c)
         if (!h3c->hq)
 #endif
         {
-            if (ngx_http_v3_send_goaway(c, (n + 1) << 2) != NGX_OK) {
+            if (ngx_http_v3_send_goaway(c, h3c->next_request_id) != NGX_OK) {
                 ngx_http_close_connection(c);
                 return;
             }