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Serves up compiled react app to base
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parent
af1689bd85
commit
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84
server.js
84
server.js
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@ -2,54 +2,75 @@ const express = require('express');
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const awsServerlessExpress = require('aws-serverless-express');
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const fs = require('fs');
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const path = require('path');
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const historyApiFallback = require('connect-history-api-fallback');
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require('dotenv').config();
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const app = express();
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const handlers = {};
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const API_DIR = '/api'; // Name of the dir containing the lambda functions
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const dirPath = path.join(__dirname, API_DIR); // Path to the lambda functions dir
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const dirPath = path.join(__dirname, '/api');
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// Execute the lambda function
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const executeHandler = async (handler, req) => {
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return new Promise((resolve, reject) => {
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const callback = (err, response) => err ? reject(err) : resolve(response);
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const promise = handler(req, {}, callback);
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if (promise && typeof promise.then === 'function') {
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promise.then(resolve).catch(reject);
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}
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});
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};
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// Array of all the lambda function file names
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const fileNames = fs.readdirSync(dirPath, { withFileTypes: true })
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.filter(dirent => dirent.isFile() && dirent.name.endsWith('.js'))
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.map(dirent => dirent.name);
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const handlers = {};
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fileNames.forEach(file => {
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const route = `/api/${file.split('.')[0]}`;
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const handler = require(path.join(__dirname, '/api', file)).handler;
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const routeName = file.split('.')[0];
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const route = `${API_DIR}/${routeName}`;
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const handler = require(path.join(dirPath, file)).handler;
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handlers[route] = handler;
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app.get(route, async (req, res) => {
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try {
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const result = await new Promise((resolve, reject) => {
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const cb = (err, response) => err ? reject(err) : resolve(response);
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const promise = handler(req, {}, cb);
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if (promise && typeof promise.then === 'function') {
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promise.then(resolve).catch(reject);
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}
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});
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res.status(result.statusCode).json(JSON.parse(result.body));
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const { statusCode = 200, body = '' } = await executeHandler(handler, req);
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res.status(statusCode).json(JSON.parse(body));
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} catch (err) {
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res.status(500).json({ error: err.message });
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}
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});
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});
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const timeout = (ms, jobName = null) => {
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return new Promise((_, reject) => {
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setTimeout(() => {
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reject(new Error(`Timed out after the ${ms}ms limit${jobName ? `, when executing the ${jobName} task` : ''}`));
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}, ms);
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});
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}
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app.get('/api', async (req, res) => {
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const results = {};
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const url = req.query.url;
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const { url } = req.query;
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const maxExecutionTime = process.env.API_TIMEOUT_LIMIT || 10000;
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const handlerPromises = Object.entries(handlers).map(async ([route, handler]) => {
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const routeName = route.replace(`${API_DIR}/`, '');
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try {
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const result = await new Promise((resolve, reject) => {
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const cb = (err, response) => err ? reject(err) : resolve(response);
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const promise = handler({ query: { url } }, {}, cb);
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if (promise && typeof promise.then === 'function') {
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promise.then(resolve).catch(reject);
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}
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});
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results[route.slice(5)] = JSON.parse(result.body); // remove '/api/' prefix
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const result = await Promise.race([
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executeHandler(handler, { query: { url } }),
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timeout(maxExecutionTime, routeName)
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]);
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results[routeName] = JSON.parse((result || {}).body);
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} catch (err) {
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results[route.slice(5)] = { error: err.message };
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results[routeName] = { error: err.message };
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}
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});
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@ -57,15 +78,24 @@ app.get('/api', async (req, res) => {
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res.json(results);
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});
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// Handle SPA routing
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app.use(historyApiFallback({
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rewrites: [
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{ from: /^\/api\/.*$/, to: function(context) { return context.parsedUrl.path; } },
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]
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}));
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// Serve React App (static files from ./build)
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app.use(express.static(path.join(__dirname, 'build')));
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// Create serverless express server
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const port = process.env.API_PORT || 3001;
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const server = awsServerlessExpress
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.createServer(app)
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.listen(port, () => {
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const port = process.env.API_PORT || 3000;
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const server = awsServerlessExpress.createServer(app).listen(port, () => {
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console.log(`Server is running on port ${port}`);
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});
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exports.handler = (event, context) => {
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console.log(`EVENT: ${JSON.stringify(event)}`);
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// console.log(`EVENT: ${JSON.stringify(event)}`);
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awsServerlessExpress.proxy(server, event, context);
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};
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