[NodeJS] Promises and async/await

[alexkreidler]

It would be nice if there was a grpc-tools and/or grpc_node_plugin option that would generate client and server code that follows the ES6 Promise and ES7 async/await model.

For example, instead of:

grpc/examples/node/static_codegen/greeter_client.js

Lines 35 to 37 in 98f8989

	client.sayHello(request, function(err, response) {
	console.log('Greeting:', response.getMessage());
	});

We could write:

  [err, response] = await client.sayHello(request);

Or something similar. On the server side, instead of:

grpc/examples/node/static_codegen/greeter_server.js

Lines 27 to 31 in 98f8989

	function sayHello(call, callback) {
	var reply = new messages.HelloReply();
	reply.setMessage('Hello ' + call.request.getName());
	callback(null, reply);
	}

We could write:

async function sayHello(call) {
  var reply = new messages.HelloReply();
  reply.setMessage('Hello ' + call.request.getName());
  return [null, reply]
}

Again, just ideas.

This feature would eliminate the need for wrapper code for users wanting to use this pattern. I would love to know if anyone is interested in this feature or planning on adding it. Thanks!

[murgatroid99]

Would you mind opening this against https://github.com/grpc/grpc-node? Going forward, that's where gRPC Node development will be, so it would be better to have this discussion there.

[alexkreidler]

Moved to grpc/grpc-node#54