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  • Race condition errors in new refresh_schemas() mechanism · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
781560989 https://github.com/simonw/datasette/issues/1231#issuecomment-781560989 https://api.github.com/repos/simonw/datasette/issues/1231 MDEyOklzc3VlQ29tbWVudDc4MTU2MDk4OQ== simonw 9599 2021-02-18T18:50:53Z 2021-02-18T18:50:53Z OWNER

Ideally I'd figure out a way to replicate this error in a concurrent unit test.

 
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 Race condition errors in new refresh_schemas() mechanism 811367257  
781560865 https://github.com/simonw/datasette/issues/1231#issuecomment-781560865 https://api.github.com/repos/simonw/datasette/issues/1231 MDEyOklzc3VlQ29tbWVudDc4MTU2MDg2NQ== simonw 9599 2021-02-18T18:50:38Z 2021-02-18T18:50:38Z OWNER

I started trying to use locks to resolve this but I've not figured out the right way to do that yet - here's my first experiment: ```diff diff --git a/datasette/app.py b/datasette/app.py index 9e15a16..1681c9d 100644 --- a/datasette/app.py +++ b/datasette/app.py @@ -217,6 +217,7 @@ class Datasette: self.inspect_data = inspect_data self.immutables = set(immutables or []) self.databases = collections.OrderedDict() + self._refresh_schemas_lock = threading.Lock() if memory or not self.files: self.add_database(Database(self, is_memory=True), name="_memory") # memory_name is a random string so that each Datasette instance gets its own @@ -324,6 +325,13 @@ class Datasette: self.client = DatasetteClient(self)

 async def refresh_schemas(self):
  • return
  • if self._refresh_schemas_lock.locked():
  • return
  • with self._refresh_schemas_lock:
  • await self._refresh_schemas() +
  • async def _refresh_schemas(self): internal_db = self.databases["_internal"] if not self.internal_db_created: await init_internal_db(internal_db) ```
 
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 Race condition errors in new refresh_schemas() mechanism 811367257  

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