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       1                 :             : /*
       2                 :             :  * Copyright 2025 Jinwoo Sung
       3                 :             :  *
       4                 :             :  * Licensed under the Apache License, Version 2.0 (the "License");
       5                 :             :  * you may not use this file except in compliance with the License.
       6                 :             :  * You may obtain a copy of the License at
       7                 :             :  *
       8                 :             :  *     http://www.apache.org/licenses/LICENSE-2.0
       9                 :             :  *
      10                 :             :  * Unless required by applicable law or agreed to in writing, software
      11                 :             :  * distributed under the License is distributed on an "AS IS" BASIS,
      12                 :             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13                 :             :  * See the License for the specific language governing permissions and
      14                 :             :  * limitations under the License.
      15                 :             :  */
      16                 :             : 
      17                 :             : #pragma once
      18                 :             : #include <mutex>
      19                 :             : 
      20                 :             : #include "wirestead/base/common.hpp"
      21                 :             : 
      22                 :             : namespace wirestead::wrapper::detail {
      23                 :             : // Independent of the send-admission lock. A retry is not a terminal error, and a
      24                 :             : // terminal failure before any connection must not invent a disconnect.
      25                 :             : struct LifecycleEvents {
      26                 :             :   std::mutex mutex;
      27                 :             :   bool connected = false;
      28                 :             :   bool terminal_error = false;
      29                 :             :   struct Notification {
      30                 :             :     bool disconnect;
      31                 :             :     bool error;
      32                 :             :   };
      33                 :        1759 :   void reset() {
      34                 :        1759 :     std::lock_guard<std::mutex> lock(mutex);
      35                 :        1759 :     connected = false;
      36                 :        1759 :     terminal_error = false;
      37                 :        1759 :   }
      38                 :        2074 :   Notification observe(base::LinkState state, bool ready) {
      39                 :        2074 :     std::lock_guard<std::mutex> lock(mutex);
      40   [ +  +  +  + ]:        2074 :     const bool lost = connected && !ready;
      41                 :        2074 :     connected = ready;
      42         [ +  + ]:        2074 :     if (ready) terminal_error = false;
      43   [ +  +  +  + ]:        2074 :     const bool error = state == base::LinkState::Error && !terminal_error;
      44         [ +  + ]:        2074 :     if (error) terminal_error = true;
      45                 :        2074 :     return {lost, error};
      46                 :        2074 :   }
      47                 :             : };
      48                 :             : }  // namespace wirestead::wrapper::detail