trace-948.js

// Client for https://github.com/grpc/grpc-go/blob/master/examples/helloworld/greeter_server/main.go.
// 'helloworld.proto' is https://github.com/grpc/grpc-go/blob/master/examples/helloworld/helloworld/helloworld.proto.

const tracer = require('@google-cloud/trace-agent').start({ bufferSize: 1, samplingRate: 0 });
const grpc = require('grpc');
const bluebird = require('bluebird');

const protoFile = __dirname + '/helloworld.proto';
const proto = grpc.load(protoFile).helloworld;

const makeSingleClientCall = (port, value) => {
  const client = new proto.Greeter(`localhost:${port}`, grpc.credentials.createInsecure());
  return bluebird.promisify(client.sayHello.bind(client))({ name: value }).timeout(10000);
};

async function main() {
  await tracer.runInRootSpan({ name: 'outer' }, async (span) => {
    console.log(span.getTraceContext());
    const res = await makeSingleClientCall(8080, 'hi');
    span.endSpan();
    console.log(res);
  });
}

main().catch(console.error);