/**

* Copyright 2016, 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.

*/

// [START app]

'use strict';

// [START setup]

const express = require('express');

const winston = require('winston');

const app = express();

const logFile = '/var/log/app_engine/custom_logs/myapp.errors.log.json';

winston.add(winston.transports.File, {

filename: logFile

});

// [END setup]

function report (err, req) {

const payload = {

message: err.stack,

context: {

httpRequest: {

url: req.originalUrl,

method: req.method,

referrer: req.header('Referer'),

userAgent: req.header('User-Agent'),

remoteIp: req.ip,

responseStatusCode: 500

}

}

};

winston.error(payload);

}

app.get('/', (req, res, next) => {

next(new Error('something is wrong!'));

});

app.use((err, req, res, next) => {

report(err, req);

res.status(500).send(err.message || 'Something broke!');

});

// [START listen]

const PORT = process.env.PORT || 8080;

app.listen(PORT, () => {

console.log(`App listening on port ${PORT}`);

console.log('Press Ctrl+C to quit.');

});

// [END listen]

// [END app]

module.exports = app;