Add DB Connection Manager

src/common/udr.h

@@ -27,6 +27,8 @@
 
 #define HEART_BEAT_TIMER 10
 
+#define DB_CONNECTION_TIMER 1000
+
 #define _unused(x) ((void) (x))
 
 #define NNRF_NFM_BASE "/nnrf-nfm/"
@@ -78,7 +80,7 @@ typedef enum db_type_s {
   DB_TYPE_CASSANDRA = 2
 } db_type_t;
 
-static const std::vector<std::string> db_type_e2str = {"Unknown", "MySQL",
-                                                       "Cassandra"};
+static const std::vector<std::string> db_type_e2str = {
+    "Unknown", "MySQL", "Cassandra"};
 
 #endif

src/udr_app/db_connection_manager.cpp

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this
+ * file except in compliance with the License. You may obtain a copy of the
+ * License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+/*! \file db_connection_manager.cpp
+ \brief
+ \author  Tien-Thinh NGUYEN
+ \company Eurecom
+ \date 2022
+ \email:
+ */
+
+#include "db_connection_manager.hpp"
+
+#include "logger.hpp"
+#include "udr.h"
+#include "udr_app.hpp"
+
+using namespace oai::udr::config;
+using namespace oai::udr::app;
+
+using json = nlohmann::json;
+
+extern udr_config udr_cfg;
+
+//------------------------------------------------------------------------------
+db_connection_manager::db_connection_manager(udr_event& ev) : m_event_sub(ev) {}
+
+//---------------------------------------------------------------------------------------------
+void db_connection_manager::start_event_connection_initialization(
+    std::shared_ptr<database_wrapper_abstraction>& db_connector) {
+  // get current time
+  uint64_t ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+                    std::chrono::system_clock::now().time_since_epoch())
+                    .count();
+  struct itimerspec its;
+  its.it_value.tv_sec  = DB_CONNECTION_TIMER;  // seconds
+  its.it_value.tv_nsec = 0;                    // 100 * 1000 * 1000; //100ms
+  const uint64_t interval =
+      its.it_value.tv_sec * 1000 +
+      its.it_value.tv_nsec / 1000000;  // convert sec, nsec to msec
+
+  db_connection = m_event_sub.subscribe_task_db_connection_reset(
+      boost::bind(&udr_nrf::trigger_connection_reset_procedure, this, _1, _2),
+      db_connector, interval, ms + interval);
+}
+//---------------------------------------------------------------------------------------------
+void db_connection_manager::trigger_connection_reset_procedure(
+    std::shared_ptr<database_wrapper_abstraction>& db_connector, uint64_t ms) {
+  _unused(ms);
+
+  // Close the current connection
+  db_connector.close_connection();
+  // and start a new one
+  db_connector.initialize();
+}

src/udr_app/db_connection_manager.hpp

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this
+ * file except in compliance with the License. You may obtain a copy of the
+ * License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+/*! \file db_connection_manager.hpp
+ \author  Tien-Thinh NGUYEN
+ \company Eurecom
+ \date 2022
+ \email:
+ */
+
+#ifndef FILE_DB_CONNECTION_MANAGER_SEEN
+#define FILE_DB_CONNECTION_MANAGER_SEEN
+
+#include "database_wrapper_abstraction.hpp"
+#include "udr_event.hpp"
+
+namespace oai {
+namespace udr {
+namespace app {
+
+class db_connection_manager {
+ private:
+ public:
+  db_connection_manager(udr_event& ev);
+  db_connection_manager(db_connection_manager const&) = delete;
+  void operator=(db_connection_manager const&) = delete;
+
+  /*
+   * Start event connection initialization procedure
+   * @param [void]
+   * @return void
+   */
+  void start_event_connection_initialization(
+      std::shared_ptr<database_wrapper_abstraction>& db_connector);
+
+  /*
+   * Trigger connection reset procedure  (NF Heartbeat)
+   * @param [void]
+   * @return void
+   */
+  void trigger_connection_reset_procedure(
+      uint64_t ms, std::shared_ptr<database_wrapper_abstraction>& db_connector);
+
+ private:
+  udr_event& m_event_sub;
+  bs2::connection task_connection;
+  bs2::connection db_connection;
+};
+}  // namespace app
+}  // namespace udr
+}  // namespace oai
+#endif /* FILE_DB_CONNECTION_MANAGER_SEEN */

src/udr_app/udr_app.cpp

@@ -37,6 +37,7 @@
 #include "mysql_db.hpp"
 #include "udr_config.hpp"
 #include "udr_nrf.hpp"
+#include "db_connection_manager.hpp"
 
 using namespace oai::udr::app;
 using namespace oai::udr::model;
@@ -44,7 +45,8 @@ using namespace oai::udr::config;
 
 extern udr_app* udr_app_inst;
 extern udr_config udr_cfg;
-udr_nrf* udr_nrf_inst = nullptr;
+udr_nrf* udr_nrf_inst                             = nullptr;
+db_connection_manager* db_connection_manager_inst = nullptr;
 
 //------------------------------------------------------------------------------
 udr_app::udr_app(const std::string& config_file, udr_event& ev)
@@ -73,12 +75,23 @@ udr_app::udr_app(const std::string& config_file, udr_event& ev)
       throw;
     }
   }
+
+  // DB Connection Manager
+  try {
+    db_connection_manager_inst = new db_connection_manager(ev);
+    Logger::udr_app().info("DB Connection Task Created ");
+  } catch (std::exception& e) {
+    Logger::udr_app().error("Cannot create DB Connection Task: %s", e.what());
+    throw;
+  }
   Logger::udr_app().startup("Started");
 }
 
 //------------------------------------------------------------------------------
 udr_app::~udr_app() {
   Logger::udr_app().debug("Delete UDR APP instance...");
+  // Close DB connection
+  db_connector->close_connection();
 }
 
 //------------------------------------------------------------------------------

src/udr_app/udr_event.cpp

@@ -42,3 +42,13 @@ bs2::connection udr_event::subscribe_task_nf_heartbeat(
   };
   return task_tick.connect(f);
 }
+
+bs2::connection udr_event::subscribe_task_db_connection_reset(
+    const db_connection_sig_t::slot_type& sig,
+    std::shared_ptr<database_wrapper_abstraction>& db_connector,
+    uint64_t period, uint64_t start) {
+  auto f = [db_connector, period, start, sig](uint64_t t) {
+    if (t >= start && (t - start) % period == 0) sig(db_connector, t);
+  };
+  return db_connection_sig.connect(f);
+}

src/udr_app/udr_event.hpp

@@ -66,8 +66,20 @@ class udr_event {
   bs2::connection subscribe_task_nf_heartbeat(
       const task_sig_t::slot_type& sig, uint64_t period, uint64_t start = 0);
 
+  /*
+   * Subscribe to the task db connection reset event
+   * @param [const db_connection_sig_t::slot_type &] sig
+   * @param [uint64_t] period: interval between two events
+   * @param [uint64_t] start:
+   * @return void
+   */
+  bs2::connection subscribe_task_db_connection_reset(
+      const db_connection_sig_t::slot_type& sig, uint64_t period,
+      uint64_t start = 0);
+
  private:
   task_sig_t task_tick;
+  db_connection_sig_t db_connection_sig;
 };
 }  // namespace oai::udr::app
 #endif

src/udr_app/udr_event_sig.hpp

@@ -33,6 +33,8 @@
 #include <boost/signals2.hpp>
 #include <string>
 
+#include "database_wrapper_abstraction.hpp"
+
 namespace bs2 = boost::signals2;
 
 namespace oai::udr::app {
@@ -41,5 +43,9 @@ typedef bs2::signal_type<
     void(uint64_t), bs2::keywords::mutex_type<bs2::dummy_mutex>>::type
     task_sig_t;
 
+typedef bs2::signal_type<
+    void(uint64_t, std::shared_ptr<database_wrapper_abstraction>&),
+    bs2::keywords::mutex_type<bs2::dummy_mutex>>::type db_connection_sig_t;
+
 }  // namespace oai::udr::app
 #endif