dialog: added timer process to clean unconfirmed dialogs older than 5min

- timer runs every 90sec (customization to be added in the future)
- safety procedure for cleaning dialog list

modules/dialog/dialog.c

@@ -138,6 +138,7 @@ int dlg_db_mode_param = DB_MODE_NONE;
 str dlg_xavp_cfg = {0};
 int dlg_ka_timer = 0;
 int dlg_ka_interval = 0;
+int dlg_clean_timer = 90;
 
 /* db stuff */
 static str db_url = str_init(DEFAULT_DB_URL);
@@ -147,6 +148,7 @@ static int pv_get_dlg_count( struct sip_msg *msg, pv_param_t *param,
 		pv_value_t *res);
 
 void dlg_ka_timer_exec(unsigned int ticks, void* param);
+void dlg_clean_timer_exec(unsigned int ticks, void* param);
 
 /* commands wrappers and fixups */
 static int fixup_profile(void** param, int param_no);
@@ -697,9 +699,14 @@ static int mod_init(void)
 	}
 
 	destroy_dlg_callbacks( DLGCB_LOADED );
+
+	/* timer process to send keep alive requests */
 	if(dlg_ka_timer>0 && dlg_ka_interval>0)
 		register_sync_timers(1);
 
+	/* timer process to clean old unconfirmed dialogs */
+	register_sync_timers(1);
+
 	return 0;
 }
 
@@ -708,11 +715,18 @@ static int child_init(int rank)
 {
 	dlg_db_mode = dlg_db_mode_param;
 
-	if(rank==PROC_MAIN && dlg_ka_timer>0 && dlg_ka_interval>0)
-	{
-		if(fork_sync_timer(PROC_TIMER, "Dialog KA Timer", 1 /*socks flag*/,
-				dlg_ka_timer_exec, NULL, dlg_ka_timer /*sec*/)<0) {
-			LM_ERR("failed to start ka timer routine as process\n");
+	if(rank==PROC_MAIN) {
+		if(dlg_ka_timer>0 && dlg_ka_interval>0) {
+			if(fork_sync_timer(PROC_TIMER, "Dialog KA Timer", 1 /*socks flag*/,
+					dlg_ka_timer_exec, NULL, dlg_ka_timer /*sec*/)<0) {
+				LM_ERR("failed to start ka timer routine as process\n");
+				return -1; /* error */
+			}
+		}
+
+		if(fork_sync_timer(PROC_TIMER, "Dialog Clean Timer", 1 /*socks flag*/,
+					dlg_clean_timer_exec, NULL, dlg_clean_timer /*sec*/)<0) {
+			LM_ERR("failed to start clean timer routine as process\n");
 			return -1; /* error */
 		}
 	}
@@ -1221,6 +1235,11 @@ void dlg_ka_timer_exec(unsigned int ticks, void* param)
 	dlg_ka_run(ticks);
 }
 
+void dlg_clean_timer_exec(unsigned int ticks, void* param)
+{
+	dlg_clean_run(ticks);
+}
+
 static int fixup_dlg_bye(void** param, int param_no)
 {
 	char *val;

modules/dialog/dlg_hash.c

@@ -223,6 +223,38 @@ int dlg_ka_run(ticks_t ti)
 	return 0;
 }
 
+/**
+ * clean old unconfirmed dialogs
+ *
+ */
+int dlg_clean_run(ticks_t ti)
+{
+	unsigned int i;
+	unsigned int tm;
+	dlg_cell_t *dlg;
+	dlg_cell_t *tdlg;
+
+	tm = (unsigned int)time(NULL);
+	for(i=0; i<d_table->size; i++)
+	{
+		lock_set_get(d_table->locks, d_table->entries[i].lock_idx);
+		dlg = d_table->entries[i].first;
+		while (dlg) {
+			tdlg = dlg;
+			dlg = dlg->next;
+			if(tdlg->state==DLG_STATE_UNCONFIRMED && tdlg->init_ts<tm-300) {
+				/* dialog in early state older than 5min */
+				LM_NOTICE("dialog in early state is too old (%p ref %d)\n",
+						tdlg, tdlg->ref);
+				unlink_unsafe_dlg(&d_table->entries[i], tdlg);
+				destroy_dlg(tdlg);
+			}
+		}
+		lock_set_release(d_table->locks, d_table->entries[i].lock_idx);
+	}
+	return 0;
+}
+
 /*!
  * \brief Initialize the global dialog table
  * \param size size of the table
@@ -434,6 +466,7 @@ struct dlg_cell* build_new_dlg( str *callid, str *from_uri, str *to_uri,
 
 	memset( dlg, 0, len);
 	dlg->state = DLG_STATE_UNCONFIRMED;
+	dlg->init_ts = (unsigned int)time(NULL);
 
 	dlg->h_entry = core_hash( callid, 0, d_table->size);
 	LM_DBG("new dialog on hash %u\n",dlg->h_entry);

modules/dialog/dlg_hash.h

@@ -114,6 +114,7 @@ typedef struct dlg_cell
 	unsigned int         h_entry;	/*!< index of hash table entry (the slot number) */
 	unsigned int         state;		/*!< dialog state */
 	unsigned int         lifetime;		/*!< dialog lifetime */
+	unsigned int         init_ts;		/*!< init (creation) time (absolute UNIX ts)*/
 	unsigned int         start_ts;		/*!< start time  (absolute UNIX ts)*/
 	unsigned int         dflags;		/*!< internal dialog memory flags */
 	unsigned int         iflags;		/*!< internal dialog persistent flags */
@@ -527,6 +528,8 @@ int dlg_ka_add(dlg_cell_t *dlg);
 
 int dlg_ka_run(ticks_t ti);
 
+int dlg_clean_run(ticks_t ti);
+
 /*!
  * \brief Update dialog lifetime - for internal callers.
  */