@podium/layout
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Module for building a Layout server. A Layout server is mainly responsible for fetching HTML content from podlets and stitching these fragments into an full HTML page (called a layout in Podium speak).
To do this, a Layout instance provides three core features:
@podium/client used to fetch content from podlets@podium/context used to set request bound information on the requests from the layout to podlets when fetching their content@podium/proxy makes it possible to publicly expose data endpoints in a podlet or in any backend serviceA Layout can be used together with any connect middleware compatible HTTP framework (eg. Express.js) and any templating language of your choosing (or none if you prefer).
$ npm install @podium/layout
Build a simple Layout server with a single podlet using Express js
const express = require('express');
const Layout = require('@podium/layout');
const layout = new Layout({
name: 'myLayout',
pathname: '/',
});
const podlet = layout.client.register({
name: 'myPodlet',
uri: 'http://localhost:7100/manifest.json',
});
const app = express();
app.use(layout.middleware());
app.get('/', (req, res, next) => {
const ctx = res.locals.podium.context;
Promise.all([podlet.fetch(ctx)]).then(result => {
res.status(200).send(`
<html><body>
<section>${result[0]}</section>
</body></html>
`);
});
});
app.listen(7000);
Create a new Layout instance.
const layout = new Layout(options);
| option | default | type | required | details |
|---|---|---|---|---|
| name | null | string | true | Name that the layout identifies itself by |
| pathname | null | string | true | Pathname of where a Layout is mounted in a http server |
| logger | null | object | false | A logger which conform to a log4j interface |
| context | null | object | false | Options to be passed on to the internal @podium/context constructor |
| client | null | object | false | Options to be passed on to the internal @podium/client constructor |
| proxy | null | object | false | Options to be passed on to the internal @podium/proxy constructor |
Name that the layout identifies itself by. The name value must be in camelCase.
Example:
const layout = new Layout({
name: 'myLayoutName',
pathname: '/foo',
});
The Pathname of where the Layout is mounted into the HTTP server. It is important that this value matches where the entry point of a route is in the HTTP server since this value is used to mount the proxy and tell podlets (through the context) where they are mounted and where the proxy is mounted.
If the layout is mounted at the server "root", set pathname to /:
const app = express();
const layout = new Layout({
name: 'myLayout',
pathname: '/',
});
app.use(layout.middleware());
app.get('/', (req, res, next) => {
[ ... ]
});
If the layout is mouned at /foo, set pathname to /foo and mount middleware and routes at or under /foo
const app = express();
const layout = new Layout({
name: 'myLayout',
pathname: '/foo',
});
app.use('/foo', layout.middleware());
app.get('/foo', (req, res, next) => {
[ ... ]
});
app.get('/foo/:id', (req, res, next) => {
[ ... ]
});
There is also a helper method for retrieving the set pathname which can
be used to get the pathname from the Layout object when defining routes.
See .pathname() for further details.
Any log4j compatible logger can be passed in and will be used for logging. Console is also supported for easy test / development.
Example:
const layout = new Layout({
name: 'myLayout',
pathname: '/foo',
logger: console,
});
Under the hood abslog is used to abstract out logging. Please see abslog for further details.
Options to be passed on to the internal @podium/context constructor.
Please see the @podium/context constructor for which options can be set.
Example of setting the debug context to default true:
const layout = new Layout({
name: 'myLayout',
pathname: '/foo',
context: {
debug: {
enabled: true,
},
},
});
Options to be passed on to the internal @podium/client constructor.
Please see @podium/client constructor for which options which can be set.
Example of setting the retries on the client to 6:
const layout = new Layout({
name: 'myLayout',
pathname: '/foo',
client: {
retries: 6,
},
});
Options to be passed on to the internal @podium/proxy constructor.
Please see @podium/proxy constructor for which options which can be set.
Example of setting the timeout on the proxy to 30 seconds:
const layout = new Layout({
name: 'myLayout',
pathname: '/foo',
proxy: {
timeout: 30000,
},
});
The Layout instance has the following API:
A connect compatible middleware which takes care of multiple operations needed for a Layout to fully work.
What it does:
res.locals.podium.context which can be passed on to the client when requesting content from podlets.This middleware should be mounted before defining any routes.
Example
const app = express();
app.use(layout.middleware());
Returns an Array of internal middleware performing the tasks described above.
A helper method to retrieve the pathname set on the constructor. This can be
handy to use in defining routes since the pathname set in the constructor
must match whatever is defined as root in each route in a HTTP router.
Example:
const layout = new Layout({
name: 'myLayout',
pathname: '/foo'
});
app.get(layout.pathname(), (req, res, next) => {
[ ... ]
});
app.get(`${layout.pathname()}/bar`, (req, res, next) => {
[ ... ]
});
app.get(`${layout.pathname()}/bar/:id`, (req, res, next) => {
[ ... ]
});
A property that exposes an instance of the @podium/client for fetching content from podlets.
Example of registering a podlet and fetching it:
const layout = new Layout({
name: 'myLayout',
pathname: '/',
});
const podlet = layout.client.register({
name: 'myPodlet',
uri: 'http://localhost:7100/manifest.json',
});
podlet.fetch({}).then(result => {
console.log(result);
});
Please see the @podium/client module for full documentation.
A property that exposes an instance of the @podium/context used to create a context.
Example of registering a custom third party context parser to the context:
const Parser = require('my-custom-parser');
const layout = new Layout({
name: 'myLayout',
pathname: '/',
});
layout.context.register('customParser', new Parser('someConfig'));
Please see the @podium/context module for full documentation.
Property that exposes a metric stream. This stream joins all internal metrics streams into one stream resulting in all metrics from all sub modules being exposed here.
Please see the @podium/metrics module for full documentation.
FAQs
Module for composing full page layouts out of page fragments in a micro frontend architecture.
The npm package @podium/layout receives a total of 470 weekly downloads. As such, @podium/layout popularity was classified as not popular.
We found that @podium/layout demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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