[tracker/sam/examples: 4/5] examples: Add endpoint example

[Sam Thursfield <sthursfield src gnome org>]

commit 074078532a03d80732751576833c580efb638172
Author: Sam Thursfield <sam afuera me uk>
Date:   Sun Nov 22 22:16:58 2020 +0100

    examples: Add endpoint example

 examples/python/endpoint.py | 77 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
---
diff --git a/examples/python/endpoint.py b/examples/python/endpoint.py
new file mode 100644
index 000000000..aaa811c80
--- /dev/null
+++ b/examples/python/endpoint.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+# Copyright (C) 2020, Sam Thursfield <sam afuera me uk>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+
+"""Demonstrates publishing a database over DBus."""
+
+import gi
+gi.require_version('Tracker', '3.0')
+from gi.repository import Gio
+from gi.repository import GLib
+from gi.repository import Tracker
+
+import logging
+import os
+import sys
+import tempfile
+
+
+def main():
+    logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
+
+    tmpdir = tempfile.mkdtemp(prefix='tracker-test-')
+
+    # Where the database is stored.
+    store_path = Gio.File.new_for_path(tmpdir)
+
+    # The database schemas.
+    ontology_path = Tracker.sparql_get_ontology_nepomuk()
+
+    cancellable = None
+
+    # Create a new, empty database.
+    conn = Tracker.SparqlConnection.new(
+        Tracker.SparqlConnectionFlags.NONE,
+        store_path,
+        ontology_path,
+        cancellable)
+
+    bus = Gio.bus_get_sync(Gio.BusType.SESSION, cancellable)
+    unique_name = bus.get_unique_name()
+
+    # Publish our endpoint on DBus.
+    endpoint = Tracker.EndpointDBus.new(conn, bus, None, cancellable)
+
+    print(f"Exposing a Tracker endpoint on bus name {unique_name}")
+    print()
+    print(f"Try connecting over D-Bus using `tracker3 sparql`:")
+    print()
+    print(f"   tracker3 sparql --dbus-service={unique_name} -q ...")
+
+    loop = GLib.MainLoop.new(None, False)
+
+    if os.environ.get('TRACKER_EXAMPLES_AUTOMATED_TEST'):
+        GLib.timeout_add(10, lambda *args: loop.quit(), None)
+    else:
+        print()
+        print(f"Press CTRL+C to quit.")
+
+    loop.run()
+
+
+main()