improve is_closed effectiveness #1229
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tristan957
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Mar 27, 2025
| @@ -487,6 +487,11 @@ impl Client { | |||
| self.connection.block_on(self.client.batch_execute(query)) | |||
| } | |||
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| /// Check the connection is alive and wait for the confirmation. | |||
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| /// Check the connection is alive and wait for the confirmation. | |
| /// Check that the connection is alive and wait for the confirmation. |
| @@ -531,6 +531,12 @@ impl Client { | |||
| simple_query::batch_execute(self.inner(), query).await | |||
| } | |||
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| /// Check the connection is alive and wait for the confirmation. | |||
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Suggested change
| /// Check the connection is alive and wait for the confirmation. | |
| /// Check that the connection is alive and wait for the confirmation. |
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Hi. We noticed that
is_closed()is not always super effective, especially in thepostgrescrate. I've added a couple utilities to try and improve this state.Problem 1:
is_closed()checks if the channel is closed, not if the connection is closed. These can be the same, but currently the channel is only closed whenConnectionis dropped. Inpostgres::Client,Connectionnever gets dropped. Fix is to force close the receiver on terminal state.Problem 2: The connection will only turn if something happens. Sometimes closure can be silent, so even still it seems open. You only can check it's valid if you try to run a query or if the TCP keepalive triggers. Running a
SELECT 1;is a common workaround, but in my understanding, a singleSYNCmessage is cheaper and doesn't cause any logging - so it's a better liveness check than running a full query.Thanks for your consideration