fix(navigation): support Python 3.6 static assets

station-navigation/server.py

@@ -125,11 +125,6 @@ def _prewarm_station_directory_cache():
 class StationNavigationHandler(SimpleHTTPRequestHandler):
     server_version = "LingniuStationNavigation/1.0"
 
-    def __init__(self, *args, **kwargs):
-        # Static files must resolve from this release directory even when the
-        # local launcher is invoked from the repository root.
-        super().__init__(*args, directory=str(ROOT), **kwargs)
-
     def do_GET(self):
         path = urlparse(self.path).path
         if path in {"/", "/index.html"}:
@@ -224,6 +219,9 @@ class StationNavigationHandler(SimpleHTTPRequestHandler):
 
 
 if __name__ == "__main__":
+    # Python 3.6 on ECS predates SimpleHTTPRequestHandler(directory=...).
+    # Resolve static assets from this release directory before serving.
+    os.chdir(str(ROOT))
     server = ThreadingHTTPServer((HOST, PORT), StationNavigationHandler)
     threading.Thread(target=_prewarm_station_directory_cache, daemon=True).start()
     print(f"Lingniu Station Navigation listening on http://{HOST}:{PORT}")

station-navigation/tests/test_server.py

@@ -31,7 +31,7 @@ class StationNavigationTest(unittest.TestCase):
         self.assertRegex(server.STATIC_ASSET_VERSION, r"^[0-9a-f]{16}$")
 
     def test_static_assets_resolve_from_the_release_directory(self):
-        self.assertIn('directory=str(ROOT)', Path(__file__).parents[1].joinpath('server.py').read_text(encoding='utf-8'))
+        self.assertIn('os.chdir(str(ROOT))', Path(__file__).parents[1].joinpath('server.py').read_text(encoding='utf-8'))
 
     def test_default_cache_window_is_two_minutes(self):
         self.assertEqual(server.STATION_CACHE_SECONDS, 120)