[#341] Support for procedure reconciliation.

If some procedures are removed either from the configuration or from the
loaded scripts, then their associated entities should also be removed
from the database when the `procedures` plugin is loaded.

platypush/plugins/procedures/__init__.py

@@ -2,9 +2,11 @@ import json
 from dataclasses import dataclass
 from typing import Callable, Collection, Optional, Union
 
+from platypush.context import get_plugin
 from platypush.entities.managers.procedures import ProcedureEntityManager
 from platypush.entities.procedures import Procedure
 from platypush.plugins import RunnablePlugin, action
+from platypush.plugins.db import DbPlugin
 from platypush.utils import run
 
 from ._serialize import ProcedureEncoder
@@ -72,6 +74,24 @@ class ProceduresPlugin(RunnablePlugin, ProcedureEntityManager):
             for name, proc in self._all_procedures.items()
         ]
 
+    def _sync_db_procedures(self):
+        cur_proc_names = set(self._all_procedures.keys())
+        db: Optional[DbPlugin] = get_plugin(DbPlugin)
+        assert db, 'No database plugin configured'
+
+        with db.get_session(
+            autoflush=False, autocommit=False, expire_on_commit=False
+        ) as session:
+            procs_to_remove = (
+                session.query(Procedure)
+                .filter(Procedure.name.not_in(cur_proc_names))
+                .all()
+            )
+
+            for proc in procs_to_remove:
+                self.logger.info('Removing stale procedure record for %s', proc.name)
+                session.delete(proc)
+
     @staticmethod
     def _serialize_procedure(
         proc: Union[dict, Callable], name: Optional[str] = None
@@ -89,6 +109,8 @@ class ProceduresPlugin(RunnablePlugin, ProcedureEntityManager):
         }
 
     def main(self, *_, **__):
+        self._sync_db_procedures()
+
         while not self.should_stop():
             self.publish_entities(self._get_wrapped_procedures())
             self.wait_stop()