gRPC Context propagation does not work

[cihati]

Describe the bug
If I have ServerInterceptor in which I set up some gRPC Context call a different service in a different thread, the Context isn't propagated.

Expected behavior
I expect to able to use Context.current() to have what I set in ServerInterceptor

Actual behavior
The Contexts are different in different threads, and the Context I set in my grpc interceptor is no longer valid.

To Reproduce

1. Run the reproducer with ./mvnw quarkus:dev
2. Run grpcurl -v -proto=src/main/proto/helloworld.proto -plaintext -d '{"name": "abc"}' localhost:9000 helloworld.Greeter.SayHello, it works
3. Now, go to src/main/java/org/acme/MyService.java and uncomment DOES NOT WORK part, try again. It'll fail.

Configuration

# Add your application.properties here, if applicable.
quarkus.grpc.clients.hello.host=localhost
quarkus.log.min-level=DEBUG

Environment (please complete the following information):

• Output of uname -a or ver: Darwin cihat-layer-mbp.local 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64
• Output of java -version:

java version "11.0.7" 2020-04-14 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.7+8-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.7+8-LTS, mixed mode)

• GraalVM version (if different from Java):
• Quarkus version or git rev:
• Build tool (ie. output of mvnw --version or gradlew --version):

Maven home: /Users/cihat/.m2/wrapper/dists/apache-maven-3.6.3-bin/1iopthnavndlasol9gbrbg6bf2/apache-maven-3.6.3
Java version: 11.0.7, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk-11.0.7.jdk/Contents/Home
Default locale: en_TR, platform encoding: UTF-8
OS name: "mac os x", version: "10.15.4", arch: "x86_64", family: "mac"

Additional context
Original discussion with @cescoffier and @FroMage at https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/Passing.20gRPC.20context.20around/near/220134523

This SO question/answer (non-Quarkus) describes my issue very well: https://stackoverflow.com/questions/47231289/how-to-pass-on-a-traceid-from-grpcs-context-to-another-thread-threadpool

I would like to see a workaround and/or a fix, and would love to see the docs updated as well. Many thanks!

[ghost]

/cc @cescoffier, @michalszynkiewicz

[michalszynkiewicz]

@cihati is this still an issue in 2.0.0.CR3?

[cihati]

To be honest, I don't know. We had quite a few problems with Quarkus at the time and moved away from it.

[cescoffier]

Just tried quickly and it seems to be fixed. So closing.
If it happens to not be fixed in your case, just re-open the issue and we will have another look.