[epiphany/mcatanzaro/#993] permissions-manager: use only one GKeyfileSettingsBackends per process

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 4e7c7b6f5f59af671dd60f48e4acd6858e0d4f3d
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed Jul 24 18:52:39 2019 -0500

    permissions-manager: use only one GKeyfileSettingsBackends per process
    
    In combination with the previous commit, which eliminates a
    GKeyfileSettingsBackend leak in our settings code and eliminates our
    custom GKeyfileSettingsBackend use for web process settings, this should
    reduce our use of GKeyfileSettingsBackend as far as possible to ensure
    we minimize usage of inotify handles.
    
    Fixes #865

 lib/ephy-permissions-manager.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)
---
diff --git a/lib/ephy-permissions-manager.c b/lib/ephy-permissions-manager.c
index bd7e88dcb..e695d9052 100644
--- a/lib/ephy-permissions-manager.c
+++ b/lib/ephy-permissions-manager.c
@@ -39,6 +39,8 @@ struct _EphyPermissionsManager {
 
   GHashTable *permission_type_permitted_origins;
   GHashTable *permission_type_denied_origins;
+
+  GSettingsBackend *backend;
 };
 
 G_DEFINE_TYPE (EphyPermissionsManager, ephy_permissions_manager, G_TYPE_OBJECT)
@@ -48,6 +50,8 @@ G_DEFINE_TYPE (EphyPermissionsManager, ephy_permissions_manager, G_TYPE_OBJECT)
 static void
 ephy_permissions_manager_init (EphyPermissionsManager *manager)
 {
+  g_autofree char *filename = NULL;
+
   manager->origins_mapping = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
   manager->settings_mapping = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_free);
 
@@ -55,6 +59,11 @@ ephy_permissions_manager_init (EphyPermissionsManager *manager)
    * the GList keys without destroying the contents of the lists. */
   manager->permission_type_permitted_origins = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, 
NULL);
   manager->permission_type_denied_origins = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, 
NULL);
+
+  /* The GKeyfileBackend needs to be shared to avoid overconsumption of inotify
+   * handles. See: epiphany#865. */
+  filename = g_build_filename (ephy_profile_dir (), PERMISSIONS_FILENAME, NULL);
+  manager->backend = g_keyfile_settings_backend_new (filename, "/", NULL);
 }
 
 static void
@@ -85,6 +94,8 @@ ephy_permissions_manager_dispose (GObject *object)
     manager->permission_type_denied_origins = NULL;
   }
 
+  g_clear_object (&manager->backend);
+
   G_OBJECT_CLASS (ephy_permissions_manager_parent_class)->dispose (object);
 }
 
@@ -102,8 +113,6 @@ ephy_permissions_manager_get_settings_for_origin (EphyPermissionsManager *manage
 {
   char *origin_path;
   char *trimmed_protocol;
-  char *filename;
-  GSettingsBackend *backend;
   GSettings *settings;
   WebKitSecurityOrigin *security_origin;
   char *pos;
@@ -114,10 +123,6 @@ ephy_permissions_manager_get_settings_for_origin (EphyPermissionsManager *manage
   if (settings)
     return settings;
 
-  filename = g_build_filename (ephy_profile_dir (), PERMISSIONS_FILENAME, NULL);
-  backend = g_keyfile_settings_backend_new (filename, "/", NULL);
-  g_free (filename);
-
   /* Cannot contain consecutive slashes in GSettings path... */
   security_origin = webkit_security_origin_new_for_uri (origin);
   trimmed_protocol = g_strdup (webkit_security_origin_get_protocol (security_origin));
@@ -130,10 +135,9 @@ ephy_permissions_manager_get_settings_for_origin (EphyPermissionsManager *manage
                                  webkit_security_origin_get_host (security_origin),
                                  webkit_security_origin_get_port (security_origin));
 
-  settings = g_settings_new_with_backend_and_path ("org.gnome.Epiphany.permissions", backend, origin_path);
+  settings = g_settings_new_with_backend_and_path ("org.gnome.Epiphany.permissions", manager->backend, 
origin_path);
   g_free (trimmed_protocol);
   g_free (origin_path);
-  g_object_unref (backend);
   webkit_security_origin_unref (security_origin);
 
   /* Note that settings is owned only by the first hash table! */