/**
 * 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 app]
const express = require('express');
const got = require('got');

const app = express();
app.enable('trust proxy');

// The following environment variable is set by app.yaml when running on App
// Engine, but will need to be set manually when running locally. See README.md.
const GA_TRACKING_ID = process.env.GA_TRACKING_ID;

function trackEvent (category, action, label, value, cb) {
  const data = {
    // API Version.
    v: '1',
    // Tracking ID / Property ID.
    tid: GA_TRACKING_ID,
    // Anonymous Client Identifier. Ideally, this should be a UUID that
    // is associated with particular user, device, or browser instance.
    cid: '555',
    // Event hit type.
    t: 'event',
    // Event category.
    ec: category,
    // Event action.
    ea: action,
    // Event label.
    el: label,
    // Event value.
    ev: value
  };

  return got.post('http://www.google-analytics.com/collect', {
    form: data
  });
}

app.get('/', (req, res, next) => {
  // Event value must be numeric.
  trackEvent('Example category', 'Example action', 'Example label', '100')
    .then(() => {
      res.status(200).send('Event tracked.').end();
    })
    // This sample treats an event tracking error as a fatal error. Depending
    // on your application's needs, failing to track an event may not be
    // considered an error.
    .catch(next);
});

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

/**
 * 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 app]
const express = require('express');
const got = require('got');

const app = express();
app.enable('trust proxy');

// The following environment variable is set by app.yaml when running on App
// Engine, but will need to be set manually when running locally. See README.md.
const GA_TRACKING_ID = process.env.GA_TRACKING_ID;

function trackEvent (category, action, label, value) {
  const data = {
    // API Version.
    v: '1',
    // Tracking ID / Property ID.
    tid: GA_TRACKING_ID,
    // Anonymous Client Identifier. Ideally, this should be a UUID that
    // is associated with particular user, device, or browser instance.
    cid: '555',
    // Event hit type.
    t: 'event',
    // Event category.
    ec: category,
    // Event action.
    ea: action,
    // Event label.
    el: label,
    // Event value.
    ev: value
  };

  return got.post('http://www.google-analytics.com/collect', {
    form: data
  });
}

app.get('/', (req, res, next) => {
  // Event value must be numeric.
  trackEvent('Example category', 'Example action', 'Example label', '100')
    .then(() => {
      res.status(200).send('Event tracked.').end();
    })
    // This sample treats an event tracking error as a fatal error. Depending
    // on your application's needs, failing to track an event may not be
    // considered an error.
    .catch(next);
});

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

Remove unused cb param (#621)