component: add is_component_registry_ready

Handy function to allow depending modules to check for registry readyness
w/o exposing internals.

component/tests/__init__.py

@@ -2,3 +2,4 @@
 from . import test_component
 from . import test_lookup
 from . import test_work_on
+from . import test_utils

component/tests/test_utils.py

@@ -0,0 +1,20 @@
+# Copyright 2023 Camptocamp SA
+# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html)
+
+from unittest import mock
+
+from odoo.addons.component.utils import is_component_registry_ready
+
+from .common import TransactionComponentRegistryCase
+
+
+class TestUtils(TransactionComponentRegistryCase):
+    def test_registry_ready(self):
+        path = "odoo.addons.component.utils.get_component_registry"
+        with mock.patch(path) as mocked:
+            mocked.return_value = None
+            self.assertFalse(is_component_registry_ready(self.env.cr.dbname))
+            self._setup_registry(self)
+            mocked.return_value = self.comp_registry
+            self.assertTrue(is_component_registry_ready(self.env.cr.dbname))
+            self._teardown_registry(self)

component/utils.py

@@ -0,0 +1,14 @@
+# Copyright 2023 Camptocamp SA
+# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html)
+
+from .core import _component_databases
+
+
+def get_component_registry(dbname):
+    return _component_databases.get(dbname)
+
+
+def is_component_registry_ready(dbname):
+    """Return True if the registry is ready to be used."""
+    comp_registry = get_component_registry(dbname)
+    return comp_registry.ready if comp_registry else False