[gnome-software/wip/hughsie/libxml-XbQuery] Use the new libxmlb prepared queries feature to make search faster

[Richard Hughes <rhughes src gnome org>]

commit 76988b1bc6a354e1c654e5f0a94bdcc09e4b5bf7
Author: Richard Hughes <richard hughsie com>
Date:   Tue Oct 23 13:27:27 2018 +0100

    Use the new libxmlb prepared queries feature to make search faster
    
    On ARM hardware this makes searches 76% faster.

 meson.build                 |  2 +-
 plugins/core/gs-appstream.c | 91 +++++++++++++++++++--------------------------
 2 files changed, 39 insertions(+), 54 deletions(-)
---
diff --git a/meson.build b/meson.build
index bea407de..f435ad79 100644
--- a/meson.build
+++ b/meson.build
@@ -98,7 +98,7 @@ conf.set('HAVE_LINUX_UNISTD_H', cc.has_header('linux/unistd.h'))
 
 appstream_glib = dependency('appstream-glib', version : '>= 0.7.14')
 gdk_pixbuf = dependency('gdk-pixbuf-2.0', version : '>= 2.32.0')
-libxmlb = dependency('xmlb', version : '>= 0.1.3', fallback : ['libxmlb', 'libxmlb_dep'])
+libxmlb = dependency('xmlb', version : '>= 0.1.4', fallback : ['libxmlb', 'libxmlb_dep'])
 gio_unix = dependency('gio-unix-2.0', version : '>= 2.56.0')
 gmodule = dependency('gmodule-2.0')
 gtk = dependency('gtk+-3.0', version : '>= 3.22.4')
diff --git a/plugins/core/gs-appstream.c b/plugins/core/gs-appstream.c
index 091aeb5b..2649ee06 100644
--- a/plugins/core/gs-appstream.c
+++ b/plugins/core/gs-appstream.c
@@ -948,70 +948,27 @@ gs_appstream_refine_app (GsPlugin *plugin,
 
 typedef struct {
        AsAppSearchMatch         match_value;
-       gchar                   *xpath;
+       XbQuery                 *query;
 } GsAppstreamSearchHelper;
 
 static void
 gs_appstream_search_helper_free (GsAppstreamSearchHelper *helper)
 {
-       g_free (helper->xpath);
+       g_object_unref (helper->query);
        g_free (helper);
 }
 
 static guint16
-gs_appstream_silo_search_component2 (XbNode *component, const gchar *search)
+gs_appstream_silo_search_component2 (GPtrArray *array, XbNode *component, const gchar *search)
 {
-       GsAppstreamSearchHelper *helper;
        guint16 match_value = 0;
-       g_autoptr(GPtrArray) array = g_ptr_array_new_with_free_func ((GDestroyNotify) 
gs_appstream_search_helper_free);
-
-       /* mimetype */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_MIMETYPE;
-       helper->xpath = g_strdup_printf ("mimetypes/mimetype[type()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* package name */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_PKGNAME;
-       helper->xpath = g_strdup_printf ("pkgname[text()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* summary */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_COMMENT;
-       helper->xpath = g_strdup_printf ("summary[text()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* name */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_NAME;
-       helper->xpath = g_strdup_printf ("name[text()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* keywords */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_KEYWORD;
-       helper->xpath = g_strdup_printf ("keywords/keyword[text()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* AppStream ID */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_ID;
-       helper->xpath = g_strdup_printf ("id[text()~='%s']", search);
-       g_ptr_array_add (array, helper);
-
-       /* origin */
-       helper = g_new0 (GsAppstreamSearchHelper, 1);
-       helper->match_value = AS_APP_SEARCH_MATCH_ORIGIN;
-       helper->xpath = g_strdup_printf ("../components[@origin~='%s']", search);
-       g_ptr_array_add (array, helper);
 
        /* do searches */
        for (guint i = 0; i < array->len; i++) {
-               g_autoptr(XbNode) n = NULL;
-               helper = g_ptr_array_index (array, i);
-               n = xb_node_query_first (component, helper->xpath, NULL);
+               g_autoptr(GPtrArray) n = NULL;
+               GsAppstreamSearchHelper *helper = g_ptr_array_index (array, i);
+               xb_query_bind_str (helper->query, 0, search, NULL);
+               n = xb_node_query_full (component, helper->query, NULL);
                if (n != NULL)
                        match_value |= helper->match_value;
        }
@@ -1019,13 +976,13 @@ gs_appstream_silo_search_component2 (XbNode *component, const gchar *search)
 }
 
 static guint16
-gs_appstream_silo_search_component (XbNode *component, gchar **search)
+gs_appstream_silo_search_component (GPtrArray *array, XbNode *component, gchar **search)
 {
        guint16 matches_sum = 0;
 
        /* do *all* search keywords match */
        for (guint i = 0; search[i] != NULL; i++) {
-               guint tmp = gs_appstream_silo_search_component2 (component, search[i]);
+               guint tmp = gs_appstream_silo_search_component2 (array, component, search[i]);
                if (tmp == 0)
                        return 0;
                matches_sum |= tmp;
@@ -1042,8 +999,36 @@ gs_appstream_search (GsPlugin *plugin,
                     GError **error)
 {
        g_autoptr(GError) error_local = NULL;
+       g_autoptr(GPtrArray) array = g_ptr_array_new_with_free_func ((GDestroyNotify) 
gs_appstream_search_helper_free);
        g_autoptr(GPtrArray) components = NULL;
        g_autoptr(GTimer) timer = g_timer_new ();
+       struct {
+               AsAppSearchMatch         match_value;
+               const gchar             *xpath;
+       } queries[] = {
+               { AS_APP_SEARCH_MATCH_MIMETYPE, "mimetypes/mimetype[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_PKGNAME,  "pkgname[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_COMMENT,  "summary[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_NAME,     "name[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_KEYWORD,  "keywords/keyword[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_ID,       "id[text()~=?]" },
+               { AS_APP_SEARCH_MATCH_ORIGIN,   "../components[@origin~=?]" },
+               { AS_APP_SEARCH_MATCH_NONE,     NULL }
+       };
+
+       /* add some weighted queries */
+       for (guint i = 0; queries[i].xpath != NULL; i++) {
+               g_autoptr(GError) error_query = NULL;
+               g_autoptr(XbQuery) query = xb_query_new (silo, queries[i].xpath, &error_query);
+               if (query != NULL) {
+                       GsAppstreamSearchHelper *helper = g_new0 (GsAppstreamSearchHelper, 1);
+                       helper->match_value = queries[i].match_value;
+                       helper->query = g_steal_pointer (&query);
+                       g_ptr_array_add (array, helper);
+               } else {
+                       g_debug ("ignoring: %s", error_query->message);
+               }
+       }
 
        /* get all components */
        components = xb_silo_query (silo, "components/component", 0, &error_local);
@@ -1057,7 +1042,7 @@ gs_appstream_search (GsPlugin *plugin,
        }
        for (guint i = 0; i < components->len; i++) {
                XbNode *component = g_ptr_array_index (components, i);
-               guint16 match_value = gs_appstream_silo_search_component (component, values);
+               guint16 match_value = gs_appstream_silo_search_component (array, component, values);
                if (match_value != 0) {
                        g_autoptr(GsApp) app = gs_appstream_create_app (plugin, silo, component, error);
                        if (app == NULL)