Fix delayed server shutdown if clients are connected to the Watch server-streaming RPC of the Health API #2573
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…althChecks for dependency reasons
….HealthChecks namespace
…ating "Watch" streams on server shutdown
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Thanks for the PR. This is a good improvement but I don't like duplicating the implementation of the health checks service. I've made a new PR that adds the same capability but with a different implementaiton: #2582 |
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Thank you, @JamesNK, for addressing the issue. I agree that duplicating the health check service wasn't the most elegant approach. |
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Fixes #2572
Changes
Grpc.HealthCheck.HealthServiceImplclass to theGrpc.AspNetCore.HealthChecksnamespace. This was necessary because theHealthServiceImplnow requires theIHostApplicationLifetime, which is not available in theGrpc.HealthCheckpackage. I assumed you prefer not to modify references of that package. I did not change the original implementation to ensure backwards compatibility.ApplicationStoppingcancellation token in theGrpc.AspNetCore.HealthChecks.HealthServiceImplclass to gracefully terminateWatchstreams during server shutdown. TheApplicationStoppingtoken was passed to theWaitToReadAsyncmethod to allow running calls to finish when the server is stopping. In the catch block, aNotServingresponse is written to the response stream, though anRpcExceptioncould be thrown if preferred.Testing
The following screenshot shows that the server now stops within a second, even if clients are connected to the
WatchRPC at the time of shutdown. The server was stopped at 12:09:17 (via the terminal).