services: added record extension registry

invenio_rdm_records/ext.py

@@ -102,6 +102,7 @@ def __init__(self, app=None):
     def init_app(self, app):
         """Flask application initialization."""
         self.init_config(app)
+        self.init_record_service_registry(app)
         self.init_services(app)
         self.init_resource(app)
         app.extensions["invenio-rdm-records"] = self
@@ -310,6 +311,24 @@ def fix_datacite_configs(self, app):
             if config_item in app.config:
                 app.config[config_item] = str(app.config[config_item])
 
+    def init_record_service_registry(self, app):
+        # TODO load entry points
+        self.record_service_registry = {}
+        self._register_entry_point(
+            self.record_service_registry,
+            "invenio_rdm_records.services.record_service_registry",
+        )
+        # Discussed w/Alex
+        # Interface could be the function itself that modifies the record class and returns it
+
+    def _register_entry_point(self, registry, ep_name):
+        """Load entry points into the given registry."""
+        for ep in set(entry_points(group=ep_name)):
+            ext_name = ep.name
+            callback = ep.load()
+            assert callable(callback)
+            registry.setdefault(ext_name, callback)
+
 
 def finalize_app(app):
     """Finalize app.

invenio_rdm_records/services/config.py

@@ -102,6 +102,7 @@
     StatusParam,
 )
 from .sort import VerifiedRecordsSortParam
+from werkzeug.utils import cached_property
 
 
 def is_draft_and_has_review(record, ctx):
@@ -396,8 +397,20 @@ def expand(self, obj, context):
 class RDMRecordServiceConfig(RecordServiceConfig, ConfiguratorMixin):
     """RDM record draft service config."""
 
-    # Record and draft classes
-    record_cls = FromConfig("RDM_RECORD_CLS", default=RDMRecord)
+    @cached_property
+    def record_cls(self):
+        """Record class."""
+        cfg_cls = self._app.config.get("RDM_RECORD_CLS", RDMRecord)
+        exts = getattr(
+            self._app.extensions["invenio-rdm-records"], "record_service_registry", {}
+        )
+        new_cls = cfg_cls
+        for name, _ext in exts.items():
+            tmp = _ext(self._app, new_cls)
+            assert type(tmp) == type(cfg_cls), f"Invalid record type. Expected: {type(cfg_cls)}, got: {type(tmp)}"
+            new_cls = tmp
+        return new_cls
+
     draft_cls = FromConfig("RDM_DRAFT_CLS", default=RDMDraft)
 
     # Schemas