knownasilya / index-html-loader

Load and cache index.html using GCP PubSub, works great with ember-cli-deploy

index-html-loader

Load index.html from some source and compile it arbitrary data using handlebars. Subsequent requests will use the cache. Cache will be reset and prewarmed when the subscription is triggered in GCP PubSub.

This library works great with ember-cli-deploy and specifically the following plugins:

• https://github.com/knownasilya/ember-cli-deploy-gcloud-pubsub
• https://github.com/knownasilya/ember-cli-deploy-gcloud-storage
• https://github.com/mwpastore/ember-cli-deploy-sql

Example

import setupLoader from 'index-html-loader';
import pkg from './package.json';

const pubsubOptions = { /* ... */ };
const indexHtml = setupLoader({
  project: pkg.name,
  version: pkg.version,
  env: process.env.NODE_ENV,
  // Make sure each pod is invalidated in kubernetes
  subscriptionPostfix: process.env.GCP_POD_ID,
  pubsubOptions,
  findRevision: async (project, revisionId) => {
    return await loadHtml(project, revisionId);
  }
});

router.get('/*', async function (req, res) {
  let data = await loadSomeData();
  let html = await indexHtml.load(data, req.query.revisionKey);

  res.header('Cache-Control', 'private, no-cache, no-store, must-revalidate');
  res.header('Expires', '-1');
  res.header('Pragma', 'no-cache');
  res.send(html);
});

Debug

You can log details from this library by adding the following environment variable to your start/watch script.

DEBUG=index-html-loader npm start