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// Copyright 2017 Google LLC
//
// 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.
// [START gae_flex_datastore_app]
'use strict';
const express = require('express');
const crypto = require('crypto');
const app = express();
app.enable('trust proxy');
// By default, the client will authenticate using the service account file
// specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable and use
// the project specified by the GOOGLE_CLOUD_PROJECT environment variable. See
// https://github.com/GoogleCloudPlatform/google-cloud-node/blob/master/docs/authentication.md
// These environment variables are set automatically on Google App Engine
const {Datastore} = require('@google-cloud/datastore');
// Instantiate a datastore client
const datastore = new Datastore({
projectId: 'long-door-651',
});
/**
* Insert a visit record into the database.
*
* @param {object} visit The visit record to insert.
*/
const insertVisit = visit => {
return datastore.save({
key: datastore.key('visit'),
data: visit,
});
};
/**
* Retrieve the latest 10 visit records from the database.
*/
const getVisits = () => {
const query = datastore
.createQuery('visit')
.order('timestamp', {descending: true})
.limit(10);
return datastore.runQuery(query);
};
app.get('/', async (req, res, next) => {
// Create a visit record to be stored in the database
const visit = {
timestamp: new Date(),
// Store a hash of the visitor's ip address
userIp: crypto
.createHash('sha256')
.update(req.ip)
.digest('hex')
.substr(0, 7),
};
try {
await insertVisit(visit);
const [entities] = await getVisits();
const visits = entities.map(
entity => `Time: ${entity.timestamp}, AddrHash: ${entity.userIp}`
);
res
.status(200)
.set('Content-Type', 'text/plain')
.send(`Last 10 visits:\n${visits.join('\n')}`)
.end();
} catch (error) {
next(error);
}
});
const PORT = parseInt(parseInt(process.env.PORT)) || 8080;
app.listen(PORT, () => {
console.log(`App listening on port ${PORT}`);
console.log('Press Ctrl+C to quit.');
});
// [END gae_flex_datastore_app]
module.exports = app;