dialog: add parameter to configure synchronisation of all dialog states to DB

- add parameter to configure synchronisation of all dialog states to DB
- new parameter update_all_states added to module interface
- activated by default to provide correct failover behaviour for users
- really large installation should test it and consider the load trade-off

src/modules/dialog/dialog.c

@@ -114,6 +114,7 @@ int dlg_noack_timeout = 60;
 int dlg_end_timeout = 300;
 
 int dlg_enable_dmq = 0;
+int dlg_update_all_states = 1;
 
 int dlg_event_rt[DLG_EVENTRT_MAX];
 str dlg_event_callback = STR_NULL;
@@ -327,6 +328,7 @@ static param_export_t mod_params[]={
 	{ "h_id_start",            PARAM_INT, &dlg_h_id_start           },
 	{ "h_id_step",             PARAM_INT, &dlg_h_id_step            },
 	{ "keep_proxy_rr",         INT_PARAM, &dlg_keep_proxy_rr        },
+	{ "update_all_states",     INT_PARAM, &dlg_update_all_states    },
 	{ 0,0,0 }
 };
 

src/modules/dialog/dlg_db_handler.c

@@ -81,6 +81,7 @@ static db1_con_t* dialog_db_handle    = 0; /* database connection handle */
 static db_func_t dialog_dbf;
 
 extern int dlg_enable_stats;
+extern int dlg_update_all_states;
 extern int dlg_h_id_start;
 extern int dlg_h_id_step;
 
@@ -815,7 +816,7 @@ int update_dialog_dbinfo_unsafe(struct dlg_cell * cell)
 			&sflags_column, /*18*/     &toroute_name_column, /*19*/ &req_uri_column, /*20*/
 			&xdata_column, /*21*/      &iflags_column  /*22*/ };
 
-	if(cell->state<DLG_STATE_EARLY || cell->state==DLG_STATE_DELETED) {
+	if((dlg_update_all_states == 0) && (cell->state<DLG_STATE_EARLY || cell->state==DLG_STATE_DELETED)) {
 		LM_DBG("not storing dlg in db during initial or deleted states\n");
 		return 0;
 	}

src/modules/dialog/doc/dialog_admin.xml

@@ -82,7 +82,8 @@
 			<para><emphasis>5</emphasis> : Deleted dialog</para>
 		</listitem>
 	</itemizedlist>
-	<para>The early and deleted dialog states are not updated in database storage.
+	<para>The early and deleted dialog states are updated in database storage,
+	unless deactivated with the <emphasis>update_all_states</emphasis> parameter.
 	</para>
 	</section>
 
@@ -1640,6 +1641,39 @@ modparam("dialog", "keep_proxy_rr", 1)
 </programlisting>
 		</example>
 	</section>
+
+	<section id="dialog.p.update_all_states">
+		<title><varname>update_all_states</varname> (string)</title>
+		<para>
+			When enabled the dialog modules will also synchronize the
+			early and deleted dialog states to the database. This is
+			useful in failover situations, but of course will generate
+			more load to the database from this module.
+		</para>
+		<para>
+			Valid values are:
+		</para>
+		<itemizedlist>
+			<listitem><para>
+				<emphasis>0</emphasis> - Don't synchronize early and deleted dialogs
+			</para></listitem>
+			<listitem><para>
+				<emphasis>1</emphasis> - Synchronize early and deleted dialogs
+			</para></listitem>
+		</itemizedlist>
+		<emphasis>
+			Default value is <quote>1</quote>.
+		</emphasis>
+		<example>
+		<title>Set <varname>update_all_states</varname> parameter</title>
+		<programlisting format="linespecific">
+...
+modparam("dialog", "update_all_states", 1)
+...
+</programlisting>
+		</example>
+	</section>
+
 	</section>
 
 	<section>