From: Henning Westerholt <hw@gilawa.com>
Date: Wed, 16 Nov 2022 15:33:06 +0000
Subject: dialog: deactivate print variable function which is only used for
 debugging

- deactivate print variable function which is only used for debugging
- this function is not good for performance and might also cause race conditions
---
 src/modules/dialog/dialog.c             |  3 +++
 src/modules/dialog/dlg_var.c            | 12 +++++++++---
 src/modules/dialog/dlg_var.h            |  2 ++
 src/modules/dialog/doc/dialog_admin.xml | 21 +++++++++++++++++++++
 4 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/src/modules/dialog/dialog.c b/src/modules/dialog/dialog.c
index 25f3ca1..49888ec 100644
--- a/src/modules/dialog/dialog.c
+++ b/src/modules/dialog/dialog.c
@@ -141,6 +141,8 @@ stat_var *expired_dlgs = 0;
 stat_var *failed_dlgs = 0;
 stat_var *early_dlgs  = 0;
 
+int debug_variables_list = 0;
+
 struct tm_binds d_tmb;
 struct rr_binds d_rrb;
 pv_spec_t timeout_avp;
@@ -338,6 +340,7 @@ static param_export_t mod_params[]={
 	{ "h_id_step",             PARAM_INT, &dlg_h_id_step            },
 	{ "keep_proxy_rr",         INT_PARAM, &dlg_keep_proxy_rr        },
 	{ "dlg_filter_mode",       INT_PARAM, &dlg_filter_mode          },
+	{ "debug_variables",       PARAM_INT, &debug_variables_list     },
 	{ 0,0,0 }
 };
 
diff --git a/src/modules/dialog/dlg_var.c b/src/modules/dialog/dlg_var.c
index 473736b..0e165c5 100644
--- a/src/modules/dialog/dlg_var.c
+++ b/src/modules/dialog/dlg_var.c
@@ -449,7 +449,9 @@ int set_dlg_variable(struct dlg_cell *dlg, str *key, str *val)
     if ( dlg_db_mode==DB_MODE_REALTIME )
         update_dialog_dbinfo(dlg);
 
-    print_lists(dlg);
+    if(unlikely(debug_variables_list)) {
+        print_lists(dlg);
+    }
 
     return 0;
 
@@ -510,7 +512,9 @@ int pv_get_dlg_variable(struct sip_msg *msg, pv_param_t *param, pv_value_t *res)
 		}
 	}
 
-	print_lists(dlg);
+	if(unlikely(debug_variables_list)) {
+		print_lists(dlg);
+	}
 
 	/* unlock dialog */
 	if (dlg) {
@@ -584,7 +588,9 @@ int pv_set_dlg_variable(struct sip_msg* msg, pv_param_t *param, int op, pv_value
 		}
 		dlg_unlock(d_table, &(d_table->entries[dlg->h_entry]));
 	}
-	print_lists(dlg);
+	if(unlikely(debug_variables_list)) {
+		print_lists(dlg);
+	}
 
 	dlg_release(dlg);
 	return 0;
diff --git a/src/modules/dialog/dlg_var.h b/src/modules/dialog/dlg_var.h
index 292e9f7..44bd6ec 100644
--- a/src/modules/dialog/dlg_var.h
+++ b/src/modules/dialog/dlg_var.h
@@ -89,6 +89,8 @@ extern stat_var *processed_dlgs;	/*!< number of processed dialogs */
 extern stat_var *expired_dlgs;		/*!< number of expired dialogs */
 extern stat_var *failed_dlgs;		/*!< number of failed dialogs */
 
+extern int debug_variables_list;
+
 int pv_get_dlg_ctx(sip_msg_t *msg,  pv_param_t *param,
 		pv_value_t *res);
 int pv_set_dlg_ctx(sip_msg_t *msg, pv_param_t *param,
diff --git a/src/modules/dialog/doc/dialog_admin.xml b/src/modules/dialog/doc/dialog_admin.xml
index 6fcaaf7..185c53a 100644
--- a/src/modules/dialog/doc/dialog_admin.xml
+++ b/src/modules/dialog/doc/dialog_admin.xml
@@ -1663,6 +1663,27 @@ modparam("dialog", "h_id_step", 10)
 ...
 modparam("dialog", "keep_proxy_rr", 1)
 ...
+</programlisting>
+		</example>
+	</section>
+	<section id="dialog.p.debug_variables">
+		<title><varname>debug_variables</varname> (int)</title>
+		<para>
+			Activate additional debugging for printing internal lists for dialog variables.
+			This output is only visible at debug log level and should only be used for
+			debugging. By default its deactivated.
+		</para>
+		<para>
+		<emphasis>
+			Default value is <quote>0</quote>.
+		</emphasis>
+		</para>
+		<example>
+		<title>Set <varname>debug_variables</varname> parameter</title>
+		<programlisting format="linespecific">
+...
+modparam("dialog", "debug_variables", 1)
+...
 </programlisting>
 		</example>
 	</section>