SequenceDispatcher: set error to all NetQueries at tear_down

td/telegram/SequenceDispatcher.cpp

@@ -319,7 +319,6 @@ class MultiSequenceDispatcherNewImpl final : public MultiSequenceDispatcherNew {
     send_closure(node.callback, &NetQueryCallback::on_result_resendable, std::move(query), std::move(promise));
   }
 
-  // TODO: without td::Result?
   void on_resend(td::Result<NetQueryPtr> query) {
     auto task_id = TaskId(get_link_token());
     auto &node = *scheduler_.get_task_extra(task_id);
@@ -337,6 +336,15 @@ class MultiSequenceDispatcherNewImpl final : public MultiSequenceDispatcherNew {
   void loop() override {
     flush_pending_queries();
   }
+  void tear_down() override {
+    // Leaves scheduler_ in an invalid state, but we are closing anyway
+    scheduler_.for_each([&](Node &node) {
+      if (node.net_query.empty()) {
+        return;
+      }
+      node.net_query->set_error(Global::request_aborted_error());
+    });
+  }
 
   void flush_pending_queries() {
     while (true) {

tdutils/td/utils/ChainScheduler.h

@@ -35,6 +35,13 @@ class ChainScheduler {
   template <class ExtraTT>
   friend td::StringBuilder &operator<<(StringBuilder &sb, ChainScheduler<ExtraTT> &scheduler);
 
+  template <class F>
+  void for_each(F &&f) {
+    tasks_.for_each([&f](auto, Task &task) {
+      f(task.extra) ;
+    });
+  }
+
  private:
   struct ChainNode : ListNode {
     TaskId task_id{};