app.js

/**
 * Copyright 2017, Google, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

// [START trace_app]
if (process.env.NODE_ENV === 'production') {
  // [START trace_setup_implicit]
  require('@google-cloud/trace-agent').start();
  // [END trace_setup_implicit]
}

const express = require('express');
const got = require('got');

const app = express();
const DISCOVERY_URL = 'https://www.googleapis.com/discovery/v1/apis';

// This incoming HTTP request should be captured by Trace
app.get('/', (req, res) => {
  // This outgoing HTTP request should be captured by Trace
  got(DISCOVERY_URL, { json: true })
    .then((response) => {
      const names = response.body.items.map((item) => item.name);

      res
        .status(200)
        .send(names.join('\n'))
        .end();
    })
    .catch((err) => {
      console.error(err);
      res
        .status(500)
        .end();
    });
});

// Start the server
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`App listening on port ${PORT}`);
  console.log('Press Ctrl+C to quit.');
});
// [END trace_app]