MM-7188: Cleaning push notification on every read, not only on channel switch (#9348)

* MM-7188: Cleaning push notification on every read, not only on channel switch

* Removed unnecesary goroutine

* Fixing tests

* Applying suggestion from PR

store/sqlstore/user_store.go

@@ -949,6 +949,16 @@ func (us SqlUserStore) GetUnreadCountForChannel(userId string, channelId string)
 	})
 }
 
+func (us SqlUserStore) GetAnyUnreadPostCountForChannel(userId string, channelId string) store.StoreChannel {
+	return store.Do(func(result *store.StoreResult) {
+		if count, err := us.GetReplica().SelectInt("SELECT SUM(c.TotalMsgCount - cm.MsgCount) FROM Channels c INNER JOIN ChannelMembers cm ON c.Id = :ChannelId AND cm.ChannelId = :ChannelId AND cm.UserId = :UserId", map[string]interface{}{"ChannelId": channelId, "UserId": userId}); err != nil {
+			result.Err = model.NewAppError("SqlUserStore.GetMentionCountForChannel", "store.sql_user.get_unread_count_for_channel.app_error", nil, err.Error(), http.StatusInternalServerError)
+		} else {
+			result.Data = count
+		}
+	})
+}
+
 func (us SqlUserStore) Search(teamId string, term string, options map[string]bool) store.StoreChannel {
 	return store.Do(func(result *store.StoreResult) {
 		searchQuery := ""

store/store.go

@@ -265,6 +265,7 @@ type UserStore interface {
 	AnalyticsActiveCount(time int64) StoreChannel
 	GetUnreadCount(userId string) StoreChannel
 	GetUnreadCountForChannel(userId string, channelId string) StoreChannel
+	GetAnyUnreadPostCountForChannel(userId string, channelId string) StoreChannel
 	GetRecentlyActiveUsersForTeam(teamId string, offset, limit int) StoreChannel
 	GetNewUsersForTeam(teamId string, offset, limit int) StoreChannel
 	Search(teamId string, term string, options map[string]bool) StoreChannel

store/storetest/mocks/UserStore.go

@@ -194,6 +194,22 @@ func (_m *UserStore) GetAllUsingAuthService(authService string) store.StoreChann
 	return r0
 }
 
+// GetAnyUnreadPostCountForChannel provides a mock function with given fields: userId, channelId
+func (_m *UserStore) GetAnyUnreadPostCountForChannel(userId string, channelId string) store.StoreChannel {
+	ret := _m.Called(userId, channelId)
+
+	var r0 store.StoreChannel
+	if rf, ok := ret.Get(0).(func(string, string) store.StoreChannel); ok {
+		r0 = rf(userId, channelId)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(store.StoreChannel)
+		}
+	}
+
+	return r0
+}
+
 // GetByAuth provides a mock function with given fields: authData, authService
 func (_m *UserStore) GetByAuth(authData *string, authService string) store.StoreChannel {
 	ret := _m.Called(authData, authService)