[gnome-music/wip/carlosg/songeditor-tracker3: 9/10] trackerwrapper: Create private SPARQL connection

[Carlos Garnacho <carlosg src gnome org>]

commit 326e4ed3ef9bee2795ed218fa0bcd0acfa3f9c9f
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun May 31 17:40:53 2020 +0200

    trackerwrapper: Create private SPARQL connection
    
    GNOME Music wants to store its own data for some things, have
    it create a private store at ~/.cache/gnome-music/db/

 gnomemusic/trackerwrapper.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)
---
diff --git a/gnomemusic/trackerwrapper.py b/gnomemusic/trackerwrapper.py
index c752af12..3bbe3287 100644
--- a/gnomemusic/trackerwrapper.py
+++ b/gnomemusic/trackerwrapper.py
@@ -21,9 +21,11 @@
 # code, but you are not obligated to do so.  If you do not wish to do so,
 # delete this exception statement from your version.
 
+import os
+
 from enum import Enum, IntEnum
 
-from gi.repository import GLib, GObject, Tracker
+from gi.repository import Gio, GLib, GObject, Tracker
 
 from gnomemusic.musiclogger import MusicLogger
 
@@ -63,8 +65,11 @@ class TrackerWrapper(GObject.GObject):
         self._tracker_available = TrackerState.UNAVAILABLE
 
         try:
-            self._tracker = Tracker.SparqlConnection.bus_new(
-                "org.freedesktop.Tracker3.Miner.Files", None, None)
+            self._tracker = Tracker.SparqlConnection.new(
+                Tracker.SparqlConnectionFlags.NONE,
+                Gio.File.new_for_path(self.cache_directory()),
+                Tracker.sparql_get_ontology_nepomuk(),
+                None)
         except GLib.Error as error:
             self._log.warning(
                 "Error: {}, {}".format(error.domain, error.message))
@@ -93,6 +98,9 @@ class TrackerWrapper(GObject.GObject):
 
         self.notify("tracker-available")
 
+    def cache_directory(self):
+        return os.path.join(GLib.get_user_cache_dir(), 'gnome-music', 'db')
+
     @GObject.Property(type=object, flags=GObject.ParamFlags.READABLE)
     def tracker(self):
         return self._tracker