// Copyright 2019 Google LLC. All rights reserved.

// Use of this source code is governed by the Apache 2.0

// license that can be found in the LICENSE file.

const express = require('express');

const app = express();

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

const project = process.env.GOOGLE_CLOUD_PROJECT;

// [START run_manual_logging]

// Uncomment and populate this variable in your code:

// $project = 'The project ID of your Cloud Run service';

// Build structured log messages as an object.

const globalLogFields = {};

// Add log correlation to nest all log messages beneath request log in Log Viewer.

const traceHeader = req.header('X-Cloud-Trace-Context');

if (traceHeader && project) {

const [trace] = traceHeader.split('/');

globalLogFields[

'logging.googleapis.com/trace'

] = `projects/${project}/traces/${trace}`;

}

// Complete a structured log entry.

const entry = Object.assign(

{

severity: 'NOTICE',

message: 'This is the default display field.',

// Log viewer accesses 'component' as 'jsonPayload.component'.

component: 'arbitrary-property',

},

globalLogFields

);

// Serialize to a JSON string and output.

console.log(JSON.stringify(entry));

// [END run_manual_logging]

res.send('Hello Logger!');

});

module.exports = app;