GraphQL and gRPC with ES4X DEMO

This is a quick demo mixing graphql and grpc with es4x. In order to keep things simple, there are 2 projects.

1. The JS project that you're currently looking at
2. A Java gRPC server under grpc/hello

Mixing Java and JS in ES4X is easy, for this project to work, first build the server part:

cd grpc/hello
./mvnw clean package

This will produce a jar that contains the proto buffers compiled classes. Now we can build the JS project

yarn install

You will notice that the npm packages will be downloaded, plus maven packages will be downloaded too, there will be even more packages downloaded that are not npm related. See the entry mvnDependencies in package.json.

Also notice that the post install calls es4x with -v which stands for vendor libs. This extra jars will be added to the classpath of the es4x application.

As this is a quick a dirty demo, start the java server with:

cd grpc/hello
./mvnw exec:java -Dexec.mainClass="com.example.hello.MainVerticle" 

This is just a helper server to showcase the interop between services...

Lets get back to JavaScript:

yarn start

You should see that the verticle was deployed successfuly, how open a browser to: http://localhost:8080/graphiql/

You can now run 2 queries:

{
  allLinks {
    url
    description
  }
}

Which will run the JS defined graphql code...

And the second query:

{helloworld}

Which goes over GraphQL to gRPC over the wire to the java server and return back to the browser.