[libgdata] Added functions gdata_test_debug_output, gdata_test_debug_handler and GSList message_list for collec

[Peteris Krisjanis <peterisk src gnome org>]

commit b116aade27c2a4b4229ba0b6cca4a425f9dfcb38
Author: Peteris Krisjanis <pecisk gmail com>
Date:   Fri Jun 21 18:55:51 2013 +0300

    Added functions gdata_test_debug_output, gdata_test_debug_handler and GSList message_list for collecting 
debug messages in memory and printing out only when needed (including pretty printing XML). Closes 
https://bugzilla.gnome.org/show_bug.cgi?id=627895

 gdata/tests/common.c |   67 ++++++++++++++++++++++++++++++++++++++++++++++++++
 gdata/tests/common.h |    3 ++
 2 files changed, 70 insertions(+), 0 deletions(-)
---
diff --git a/gdata/tests/common.c b/gdata/tests/common.c
index 80f937d..6f6c81a 100644
--- a/gdata/tests/common.c
+++ b/gdata/tests/common.c
@@ -32,6 +32,15 @@ static gboolean no_internet = FALSE;
 /* %TRUE if interactive tests should be skipped because we're running automatically (for example) */
 static gboolean no_interactive = FALSE;
 
+/* declaration of debug handler */
+static void gdata_test_debug_handler (const gchar *log_domain, GLogLevelFlags log_level, const gchar 
*message, gpointer user_data);
+
+/* declaration of printerr handler */
+static void gdata_test_assert_handler (const gchar *message);
+
+/* global list of debugging messages */
+static GSList *message_list = NULL;
+
 void
 gdata_test_init (int argc, char **argv)
 {
@@ -74,6 +83,12 @@ gdata_test_init (int argc, char **argv)
        g_test_init (&argc, &argv, NULL);
        g_test_bug_base ("http://bugzilla.gnome.org/show_bug.cgi?id=";);
 
+       /* Set handler of debug information */
+       g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, (GLogFunc) gdata_test_debug_handler, 
message_list);
+
+       /* Set handler for printerr */
+       g_set_printerr_handler ((GPrintFunc) gdata_test_assert_handler);
+
        /* Enable full debugging */
        g_setenv ("LIBGDATA_DEBUG", "3" /* GDATA_LOG_FULL */, FALSE);
        g_setenv ("G_MESSAGES_DEBUG", "libgdata", FALSE);
@@ -651,3 +666,55 @@ gdata_tear_down_async_test_data (GDataAsyncTestData *async_data, gconstpointer t
        g_object_unref (async_data->cancellable);
        g_main_loop_unref (async_data->main_loop);
 }
+
+void
+gdata_test_debug_output (void)
+{
+       if (message_list == NULL) {
+               /* No debugging messages */
+               return;
+       }
+       do {
+               gchar *message = (gchar*) message_list->data;
+               if (message != NULL) {
+                       if (strlen (message) > 2 && message[2] == '<') {
+                               /* As debug string starts with direction indicator and space, t.i. "< ", */
+                               /* we need access string starting from third character and see if it's   */
+                               /* looks like xml - t.i. it starts with '<' */
+                               xmlChar *xml_buff;
+                               int buffer_size;
+                               xmlDocPtr xml_doc;
+                               /* we need to cut to the begining of XML string */
+                               message = message + 2;
+                               /* create xml document and dump it to string buffer */
+                               xml_doc = xmlParseDoc ((const xmlChar*) message);
+                               xmlDocDumpFormatMemory (xml_doc, &xml_buff, &buffer_size, 1);
+                               /* print out structured xml - if it's not xml, it will get error in output */
+                               printf("%s", (gchar*) xml_buff);
+                               /* free xml structs */
+                               xmlFree (xml_buff);
+                               xmlFreeDoc (xml_doc);
+                       } else {
+                               printf ("%s\n", (gchar*) message);
+                       }
+                       /* free gchar */
+                       g_free ((gpointer) message_list->data);
+               }
+               /* free GSList node */
+               message_list = g_slist_delete_link (message_list, message_list);
+       } while (message_list != NULL);
+}
+
+static void
+gdata_test_debug_handler (const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, gpointer 
user_data)
+{
+       /* storing debugging messages in GSList for displaying them in case of error */
+       message_list = g_slist_append (message_list, g_strdup (message));
+}
+
+static void
+gdata_test_assert_handler (const gchar *message)
+{
+       gdata_test_debug_output ();
+       printf ("%s", (gchar*) message);
+}
diff --git a/gdata/tests/common.h b/gdata/tests/common.h
index ca8f439..d754d5f 100644
--- a/gdata/tests/common.h
+++ b/gdata/tests/common.h
@@ -284,6 +284,9 @@ gboolean gdata_async_test_cancellation_cb (GDataAsyncTestData *async_data);
 void gdata_set_up_async_test_data (GDataAsyncTestData *async_data, gconstpointer test_data);
 void gdata_tear_down_async_test_data (GDataAsyncTestData *async_data, gconstpointer test_data);
 
+/* Debugging output in case of assert failure */
+void gdata_test_debug_output (void);
+
 G_END_DECLS
 
 #endif /* !GDATA_TEST_COMMON_H */