Ensure extension RPC endpoints ready before processing gRPC messages #10255
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fabiocav
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…10255) * Ensure extension RPC endpoints ready before processing gRPC messages * Add timeout and tests to waiting on RPC extensions.
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* JIT Trace - 4.35.0 using in-proc as base (#10281) * Adding a timeout to `IFunctionProvider.GetFunctionMetadataAsync` (#10249) (#10273) * Adding a timeout to IFunctionProvider.GetFunctionMetadataAsync so that if a provider does not return, it will not cause a deadlock state. * Adding release notes. * Added a new internal property `MetadataProviderTimeoutInSeconds` which can be set to a different value than default, from the tests. * Added comment about property being settable. * PR feedback fixes. Throws an error when the function metadata provider method throws or when the operation timeseout. * [in-proc port] Ensure extension RPC endpoints ready before processing gRPC messages (#10282) * Ensure extension RPC endpoints ready before processing gRPC messages (#10255) * Ensure extension RPC endpoints ready before processing gRPC messages * Add timeout and tests to waiting on RPC extensions. * update release_notes.md * [in-proc] Update Microsoft.Azure.WebJobs to 3.0.41 and Microsoft.Azure.WebJobs.Host.Storage to 5.0.1 (#10288) * Upgraded the following package versions: - Microsoft.Azure.WebJobs updated to 3.0.41 - Microsoft.Azure.WebJobs.Host.Storage updated to 5.0.1 - Microsoft.Extensions.Azure updated to 1.7.1 - Azure.Storage.Blobs updated to 12.19.1 * Updating deps.json for Tests. --------- Co-authored-by: Shyju Krishnankutty <connectshyju@gmail.com> Co-authored-by: Jacob Viau <javia@microsoft.com>
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Issue describing the changes in this PR
resolves #10251
Pull request checklist
IMPORTANT: Currently, changes must be backported to the
in-procbranch to be included in Core Tools and non-Flex deployments.in-procbranch is not requiredrelease_notes.mdAdditional information
It is believed there is a race condition on startup between the first gRPC message coming in and extension RPC endpoints being registered. While
EndpointDataSourcehas a change token system, leading us to believe that we can update endpoints post startup, there is one of two possibilities occurring:UseRoutingmiddleware is first encountered. In which case this host instance would not have extension RPC endpoints for its lifetime.This fix should address both of those possible scenarios, as routing middleware is only initialized on first call. By ensuring we collect extension endpoints before the first routing occurs we avoid the race condition.
RISK: there is a small risk this could introduce a deadlock. If there is some dependency existing, or later introduced, which requires RPC communication between host and worker before all extensions are loaded host-side, then this could cause a circular dependency and deadlock. I do not believe this is the case today, as testing has shown endpoints to be available immediately on startup before the first worker RPC message comes in.