Rust gRPC tester with tonic

The tester consists of three parts: grpc-tester, grpc-generator and grpc-server. Tester is a library which enables units tests to start and stop the testing framework. The generator sends messages to server and server will collect statistics of the messages it receives.

This initial implementation does not allow injecting the proxide proxy between the grpc-generator and grpc-server. This functionality will be added in another pull request.

#### grpc-tester

The tester is a Rust library with an interface for starting and tying the generator and server together. During the startup it ensures the connection between the generator and the server are ready before returning the tester to ensure unit tests utilizing the tester won't experience random timing related failures.

Both the generator and the server are started in their own tokio runtimes to isolate the runtime used for testing. The threads associated with the generator and the server have named threads so that they can be distinguished in the debugger.

#### grpc-generator

The generator periodically sends gRPC requests (SendMessage) to the server. The purpose of the generator is to provide a constant stream of message that can be observed with the proxide proxy.

#### grpc-server

The server's main purpose is to receive and then ignore the messages it receives.

A support for retrieving statistics of the received messages will be added in the future.

.github/workflows/ci.yml

@@ -40,14 +40,16 @@ jobs:
           protoc --version 
 
       - name: Build
-        run: cargo build
+        run: |
+          cargo build
+          cargo build --manifest-path ./test/rust_grpc/Cargo.toml
 
       - name: Tests
         shell: bash
         run: |
           cd test
-          ./test_script.sh
-
+          cargo test --manifest-path ./rust_grpc/Cargo.toml
+          ./test_script.sh          
 
   style:
     name: Fmt & Clippy

test/rust_grpc/.gitignore

@@ -0,0 +1 @@
+/target