capitalize_client.js

'use strict';

const api = require('@opentelemetry/api');
// eslint-disable-next-line import/order
const tracer = require('./tracer')('example-grpc-capitalize-client');
const path = require('path');
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');

const PROTO_PATH = path.join(__dirname, 'protos/defs.proto');
const PROTO_OPTIONS = {
  keepCase: true, enums: String, defaults: true, oneofs: true,
};
const definition = protoLoader.loadSync(PROTO_PATH, PROTO_OPTIONS);
const rpcProto = grpc.loadPackageDefinition(definition).rpc;

function main() {
  const client = new rpcProto.Fetch(
    'localhost:50051',
    grpc.credentials.createInsecure(),
  );
  const data = process.argv[2] || 'opentelemetry';
  console.log('> ', data);

  const span = tracer.startSpan('tutorialsClient.capitalize');
  api.context.with(api.trace.setSpan(api.ROOT_CONTEXT, span), () => {
    client.capitalize({ data: Buffer.from(data) }, (err, response) => {
      if (err) {
        console.log('could not get grpc response');
        return;
      }
      console.log('< ', response.data.toString('utf8'));
      // display traceid in the terminal
      console.log(`traceid: ${span.spanContext().traceId}`);
      span.end();
    });
  });

  // The process must live for at least the interval past any traces that
  // must be exported, or some risk being lost if they are recorded after the
  // last export.
  console.log('Sleeping 5 seconds before shutdown to ensure all records are flushed.');
  setTimeout(() => { console.log('Completed.'); }, 5000);
}

main();