Creating a stream and immediately throwing crashes

[Joannis]

try await withGRPCClient(transport: transport) { client in
     let agent = Edge_Agent_Services_V1_EdgeAgentService.Client(wrapping: client)
     try await agent.uploadFile { writer in
        throw SomeError() // Error immediately occurs due to file does not exist
    }
}

In a nutshell this is what reproduces the issue. We have a _NIOFileSystem FileHandle in the place of the body:

try await FileSystem.shared.withFileHandle(forReadingAt: FilePath(binary)) { handle in
  // Upload data over gRPC
}

Because the file did not exist, this immediately throws an error resulting in a crash:

GRPCNIOTransportCore/GRPCStreamStateMachine.swift:1062: Fatal error: Server is closed, nothing could have been sent.

[glbrntt]

Thanks Joannis, this looks like a state machine bug. Can you look into this @gjcairo?

[gjcairo]

Hey @Joannis - I think this may actually be related to #88, where we removed the fatal error.

We haven't done a release including the fix though, and we have a policy to not do releases on Friday, so I'll get one tagged on Monday. In the meantime, could you temporarily depend on main and report back what happens?

From my tests locally (where I may not have the exact same setup you do), we're not crashing, but the stream is also not properly finished, so there does seem to be an issue elsewhere. I'll keep looking into it.

[gjcairo]

This should now be fixed by #88 and #98, and both fixes are included in https://github.com/grpc/grpc-swift-nio-transport/releases/tag/1.1.0.