[glib/wip/g-dbus-warning] Add g_dbus_warning().

[Ryan Lortie <desrt src gnome org>]

commit bd52ddc0fa3ca383cd2dadf7647d99eaf5430d28
Author: Ryan Lortie <desrt desrt ca>
Date:   Fri Apr 25 15:37:01 2014 +0200

    Add g_dbus_warning().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=728734

 gio/gdbusconnection.c |  107 +++++++++++++++++++++++++++++++++++++++++++++++++
 gio/gdbusconnection.h |    6 +++
 gio/gdbusmessage.c    |   16 +++++++
 gio/gdbusprivate.h    |    5 ++
 4 files changed, 134 insertions(+), 0 deletions(-)
---
diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index 5969a01..f9d670a 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -2309,6 +2309,7 @@ on_worker_message_received (GDBusWorker  *worker,
   //g_debug ("in on_worker_message_received");
 
   g_object_ref (message);
+  g_dbus_message_set_connection (message, connection);
   g_dbus_message_lock (message);
 
   //g_debug ("boo ref_count = %d %p %p", G_OBJECT (connection)->ref_count, connection, connection->worker);
@@ -7191,3 +7192,109 @@ g_bus_get_finish (GAsyncResult  *res,
 }
 
 /* ---------------------------------------------------------------------------------------------------- */
+
+static GDBusMessage *
+get_current_message (void)
+{
+  GSourceFunc callback;
+  gpointer user_data;
+  GSource *source;
+
+  source = g_main_current_source ();
+  if (source == NULL)
+    return NULL;
+
+  if (source->callback_funcs == NULL || source->callback_data == NULL)
+    return NULL;
+
+  (* source->callback_funcs->get) (source->callback_data, source, &callback, &user_data);
+
+  if (callback == emit_signal_instance_in_idle_cb)
+    return ((SignalInstance *) user_data)->message;
+
+  else if (callback == invoke_set_property_in_idle_cb)
+    return ((PropertyData *) user_data)->message;
+
+  else if (callback == invoke_get_property_in_idle_cb)
+    return ((PropertyData *) user_data)->message;
+
+  else if (callback == invoke_get_all_properties_in_idle_cb)
+    return ((PropertyGetAllData *) user_data)->message;
+
+  else if (callback == process_subtree_vtable_message_in_idle_cb)
+    return ((SubtreeDeferredData *) user_data)->message;
+
+  else if (callback == call_in_idle_cb)
+    return g_dbus_method_invocation_get_message (user_data);
+
+  else if (g_strcmp0 (g_source_get_name (source), "[gio] complete_in_idle_cb") == 0 &&
+           g_simple_async_result_get_source_tag (user_data) == g_dbus_connection_send_message_with_reply)
+    return g_simple_async_result_get_op_res_gpointer (user_data);
+
+  return NULL;
+}
+
+static gchar *
+get_sender_info (GDBusMessage *message)
+{
+  GDBusConnection *connection;
+  const gchar *id;
+  GVariant *reply;
+  guint32 pid = 0;
+  gchar *cmdline_filename;
+  gchar *cmdline = NULL;
+  GString *result;
+
+  id = g_dbus_message_get_sender (message);
+  connection = g_dbus_message_get_connection (message);
+
+  reply = g_dbus_connection_call_sync (connection, "org.freedesktop.DBus", "/",
+                                       "org.freedesktop.DBus", "GetConnectionUnixProcessID",
+                                       g_variant_new ("(s)", id), G_VARIANT_TYPE ("(u)"),
+                                       G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL);
+  if (reply)
+    {
+      g_variant_get (reply, "(u)", &pid);
+      g_variant_unref (reply);
+    }
+
+  if (pid)
+    {
+      cmdline_filename = g_strdup_printf ("/proc/%u/cmdline", pid);
+      g_file_get_contents (cmdline_filename, &cmdline, NULL, NULL);
+      g_free (cmdline_filename);
+    }
+
+  result = g_string_new (id);
+  if (pid)
+    g_string_append_printf (result, " pid %u", pid);
+  if (cmdline)
+    g_string_append_printf (result, " argv0 %s", cmdline);
+  g_free (cmdline);
+
+  return g_string_free (result, FALSE);
+}
+
+void
+g_dbus_warning_internal (const gchar *log_domain,
+                         const gchar *format_string,
+                         ...)
+{
+  GDBusMessage *message;
+  gchar *sender;
+  va_list ap;
+  gchar *str;
+
+  va_start (ap, format_string);
+  str = g_strdup_vprintf (format_string, ap);
+  va_end (ap);
+
+  message = get_current_message ();
+  if (message != NULL)
+    sender = get_sender_info (message);
+  else
+    sender = g_strdup ("(none)");
+
+  g_log (log_domain, G_LOG_LEVEL_WARNING, "Invalid D-Bus message from %s: %s", sender, str);
+  g_free (str);
+}
diff --git a/gio/gdbusconnection.h b/gio/gdbusconnection.h
index ffded9e..cd5ed58 100644
--- a/gio/gdbusconnection.h
+++ b/gio/gdbusconnection.h
@@ -657,6 +657,12 @@ void  g_dbus_connection_remove_filter (GDBusConnection    *connection,
 
 /* ---------------------------------------------------------------------------------------------------- */
 
+GLIB_AVAILABLE_IN_2_42
+void  g_dbus_warning_internal (const gchar *log_domain,
+                               const gchar *format_string,
+                               ...);
+#define g_dbus_warning(...) g_dbus_warning_internal (G_LOG_DOMAIN, __VA_ARGS__)
+
 
 G_END_DECLS
 
diff --git a/gio/gdbusmessage.c b/gio/gdbusmessage.c
index 824245e..d9acda1 100644
--- a/gio/gdbusmessage.c
+++ b/gio/gdbusmessage.c
@@ -502,6 +502,7 @@ struct _GDBusMessage
   /*< private >*/
   GObject parent_instance;
 
+  GDBusConnection *connection;
   GDBusMessageType type;
   GDBusMessageFlags flags;
   gboolean locked;
@@ -3617,3 +3618,18 @@ g_dbus_message_copy (GDBusMessage  *message,
 #endif
   return ret;
 }
+
+/* private */
+void
+g_dbus_message_set_connection (GDBusMessage    *message,
+                               GDBusConnection *connection)
+{
+  g_assert (!message->connection);
+  message->connection = g_object_ref (connection);
+}
+
+GDBusConnection *
+g_dbus_message_get_connection (GDBusMessage *message)
+{
+  return message->connection;
+}
diff --git a/gio/gdbusprivate.h b/gio/gdbusprivate.h
index 0e38121..7785314 100644
--- a/gio/gdbusprivate.h
+++ b/gio/gdbusprivate.h
@@ -145,6 +145,11 @@ void _g_dbus_object_proxy_remove_interface (GDBusObjectProxy *proxy,
 /* Implemented in gdbusconnection.c */
 GDBusConnection *_g_bus_get_singleton_if_exists (GBusType bus_type);
 
+/* Implemented in gdbusmessage.c */
+void g_dbus_message_set_connection (GDBusMessage    *message,
+                                    GDBusConnection *connection);
+GDBusConnection *g_dbus_message_get_connection (GDBusMessage *message);
+
 G_END_DECLS
 
 #endif /* __G_DBUS_PRIVATE_H__ */