appengine/metadata/flexible/server.js (38 lines of code) (raw):

// 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. 'use strict'; // [START gae_flex_metadata] import express from 'express'; import fetch from 'node-fetch'; const app = express(); app.enable('trust proxy'); const METADATA_NETWORK_INTERFACE_URL = 'http://metadata/computeMetadata/v1/' + '/instance/network-interfaces/0/access-configs/0/external-ip'; const getExternalIp = async () => { const options = { headers: { 'Metadata-Flavor': 'Google', }, json: true, }; try { const response = await fetch(METADATA_NETWORK_INTERFACE_URL, options); const ip = await response.json(); return ip; } catch (err) { console.log('Error while talking to metadata server, assuming localhost'); return 'localhost'; } }; app.get('/', async (req, res, next) => { try { const externalIp = await getExternalIp(); res.status(200).send(`External IP: ${externalIp}`).end(); } catch (err) { next(err); } }); const PORT = 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_metadata] export default app;