refactor: save stats.json periodically and when closing session #5476 (#5490)

libtransmission/session.cc

@@ -1323,7 +1323,7 @@ void tr_session::closeImplPart2(std::promise<void>* closed_promise, std::chrono:
     this->announcer_.reset();
     this->announcer_udp_.reset();
 
-    stats().saveIfDirty();
+    stats().save();
     peer_mgr_.reset();
     openFiles().closeAll();
     tr_utpClose(this);
@@ -2169,7 +2169,7 @@ tr_session::tr_session(std::string_view config_dir, tr_variant* settings_dict)
                 tr_torrentSave(tor);
             }
 
-            stats().saveIfDirty();
+            stats().save();
         });
     save_timer_->startRepeating(SaveIntervalSecs);
 

libtransmission/stats.cc

@@ -82,7 +82,6 @@ void tr_stats::save() const
 void tr_stats::clear()
 {
     single_ = old_ = Zero;
-    is_dirty_ = true;
     start_time_ = tr_time();
 }
 

libtransmission/stats.h

@@ -30,7 +30,7 @@ public:
 
     ~tr_stats()
     {
-        saveIfDirty();
+        save();
     }
 
     void clear();
@@ -45,35 +45,23 @@ public:
     constexpr void addUploaded(uint32_t n_bytes) noexcept
     {
         single_.uploadedBytes += n_bytes;
-        is_dirty_ = true;
     }
 
     constexpr void addDownloaded(uint32_t n_bytes) noexcept
     {
         single_.downloadedBytes += n_bytes;
-        is_dirty_ = true;
     }
 
     constexpr void addFileCreated() noexcept
     {
         ++single_.filesAdded;
-        is_dirty_ = true;
     }
 
-    void saveIfDirty()
-    {
-        if (is_dirty_)
-        {
-            save();
-            is_dirty_ = false;
-        }
-    }
+    void save() const;
 
 private:
     static tr_session_stats add(tr_session_stats const& a, tr_session_stats const& b);
 
-    void save() const;
-
     static tr_session_stats loadOldStats(std::string_view config_dir);
 
     std::string const config_dir_;
@@ -82,6 +70,4 @@ private:
     static constexpr auto Zero = tr_session_stats{ TR_RATIO_NA, 0U, 0U, 0U, 0U, 0U };
     tr_session_stats single_ = Zero;
     tr_session_stats old_ = Zero;
-
-    bool is_dirty_ = false;
 };