Add td_api::updateSpeedLimitNotification.

td/generate/scheme/td_api.tl

@@ -7151,6 +7151,11 @@ updateAnimationSearchParameters provider:string emojis:vector<string> = Update;
 //@description The list of suggested to the user actions has changed @added_actions Added suggested actions @removed_actions Removed suggested actions
 updateSuggestedActions added_actions:vector<SuggestedAction> removed_actions:vector<SuggestedAction> = Update;
 
+//@description Download or upload file speed for the user was limited, but it can be restored by subscription to Telegram Premium.
+//-Use getOption("premium_download_speedup") or getOption("premium_upload_speedup") to get expected speedup after subscription to Telegram Premium 
+//@is_upload True, if upload speed was limited; false, if download speed was limited
+updateSpeedLimitNotification is_upload:Bool = Update;
+
 //@description The list of contacts that had birthdays recently or will have birthday soon has changed @close_birthday_users List of contact users with close birthday
 updateContactCloseBirthdays close_birthday_users:vector<closeBirthdayUser> = Update;
 

td/telegram/Global.cpp

@@ -13,6 +13,7 @@
 #include "td/telegram/OptionManager.h"
 #include "td/telegram/StateManager.h"
 #include "td/telegram/TdDb.h"
+#include "td/telegram/UpdatesManager.h"
 
 #include "td/utils/format.h"
 #include "td/utils/logging.h"
@@ -343,6 +344,10 @@ void Global::add_location_access_hash(double latitude, double longitude, int64 a
   location_access_hashes_[get_location_key(latitude, longitude)] = access_hash;
 }
 
+void Global::notify_speed_limited(bool is_upload) {
+  send_closure(updates_manager_, &UpdatesManager::notify_speed_limited, is_upload);
+}
+
 double get_global_server_time() {
   return G()->server_time();
 }

td/telegram/Global.h

@@ -626,6 +626,8 @@ class Global final : public ActorContext {
     store_all_files_in_files_directory_ = flag;
   }
 
+  void notify_speed_limited(bool is_upload);
+
  private:
   std::shared_ptr<DhConfig> dh_config_;
 

td/telegram/Td.cpp

@@ -4054,6 +4054,7 @@ void Td::send_update(tl_object_ptr<td_api::Update> &&object) {
         VLOG(td_requests) << "Sending update: " << to_string(object);
       }
       break;
+    case td_api::updateSpeedLimitNotification::ID:
     case td_api::updateDefaultReactionType::ID / 2:
       LOG(ERROR) << "Sending update: " << oneline(to_string(object));
       break;

td/telegram/UpdatesManager.cpp

@@ -1784,6 +1784,15 @@ void UpdatesManager::on_server_pong(tl_object_ptr<telegram_api::updates_state> &
   }
 }
 
+void UpdatesManager::notify_speed_limited(bool is_upload) {
+  if (Time::now() < next_notify_speed_limited_[is_upload]) {
+    return;
+  }
+  next_notify_speed_limited_[is_upload] =
+      Time::now() + td_->option_manager_->get_option_integer("upload_premium_speedup_notify_period");
+  send_closure(G()->td(), &Td::send_update, td_api::make_object<td_api::updateSpeedLimitNotification>(is_upload));
+}
+
 void UpdatesManager::process_get_difference_updates(
     vector<tl_object_ptr<telegram_api::Message>> &&new_messages,
     vector<tl_object_ptr<telegram_api::EncryptedMessage>> &&new_encrypted_messages,

td/telegram/UpdatesManager.h

@@ -131,6 +131,8 @@ class UpdatesManager final : public Actor {
 
   void ping_server();
 
+  void notify_speed_limited(bool is_upload);
+
   bool running_get_difference() const {
     return running_get_difference_;
   }
@@ -280,6 +282,8 @@ class UpdatesManager final : public Actor {
   };
   FlatHashMap<uint64, SessionInfo> session_infos_;
 
+  double next_notify_speed_limited_[2] = {0.0, 0.0};
+
   void start_up() final;
 
   void tear_down() final;

td/telegram/net/NetQueryDelayer.cpp

@@ -34,10 +34,26 @@ void NetQueryDelayer::delay(NetQueryPtr query) {
     }
   } else if (code == 420) {
     auto error_message = query->error().message();
-    for (auto prefix :
-         {Slice("FLOOD_WAIT_"), Slice("SLOWMODE_WAIT_"), Slice("2FA_CONFIRM_WAIT_"), Slice("TAKEOUT_INIT_DELAY_")}) {
+    for (auto prefix : {Slice("FLOOD_WAIT_"), Slice("SLOWMODE_WAIT_"), Slice("2FA_CONFIRM_WAIT_"),
+                        Slice("TAKEOUT_INIT_DELAY_"), Slice("FLOOD_PREMIUM_WAIT_")}) {
       if (begins_with(error_message, prefix)) {
         timeout = clamp(to_integer<int>(error_message.substr(prefix.size())), 1, 14 * 24 * 60 * 60);
+        if (prefix == "FLOOD_PREMIUM_WAIT_") {
+          switch (query->type()) {
+            case NetQuery::Type::Common:
+              LOG(ERROR) << "Receive " << error_message << " for " << query;
+              break;
+            case NetQuery::Type::Upload:
+              G()->notify_speed_limited(true);
+              break;
+            case NetQuery::Type::Download:
+            case NetQuery::Type::DownloadSmall:
+              G()->notify_speed_limited(false);
+              break;
+            default:
+              UNREACHABLE();
+          }
+        }
         break;
       }
     }

td/telegram/net/NetQueryDispatcher.cpp

@@ -121,6 +121,8 @@ void NetQueryDispatcher::dispatch(NetQueryPtr net_query) {
       net_query->debug(PSTRING() << "sent to download small session multi proxy " << dest_dc_id);
       send_closure_later(dcs_[dc_pos].download_small_session_, &SessionMultiProxy::send, std::move(net_query));
       break;
+    default:
+      UNREACHABLE();
   }
 }