Monorepo

In this example we will be deploying a simple but complete Monorepo that will poll and display the time using a set of different programming languages like GoLang, PHP, Node.js, Python and even a Next.js application on the same repository.

Getting started with Monorepo

We will start by creating two main folders api which will contain all our server code using different programming languages and www will contain our Next.js application that will consume all the data from our API.

Creating our API code

Let's start by creating a file named api/go/index.go and add the following GoLang code:

package main

import (
	"fmt"
	"net/http"
	"time"
)

func Time(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, time.Now().Format(time.RFC1123Z))
}

Now we will create a file named api/node/index.js and add the following JavaScript code:

module.exports = (req, res) => {
  res.end(new Date().toString());
};

We will do the same for PHP creating a file named api/php/index.php with the following code:

<?php echo date("r")?>

And lastly let's create a file named api/python/index.py with the following Python code:

import datetime
from http.server import BaseHTTPRequestHandler

class handler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type','text/plain')
        self.end_headers()
        self.wfile.write(str(datetime.datetime.now()).encode())
        return

Creating our www code

First we will create our www folder and add a package.json file including isomorphic-unfetch in our dependencies:

{
  "name": "monorepo",
  "dependencies": {
    "isomorphic-unfetch": "3.0.0"
  }
}

Next inside the same folder let's create a pages folder with an index.js file with the following code:

import Time from '../components/time'
import 'isomorphic-unfetch'

const langs = [
  { name: 'Go', path: 'go', ext: '.go' },
  { name: 'Python', path: 'python', ext: '.py' },
  { name: 'PHP', path: 'php', ext: '.php' },
  { name: 'Node.js', path: 'node', ext: '.js' }
]

const Page = ({nows}) => <div className="container">
    <div className="logo">
      <svg width={40} height={36}>
        <path
          d="M20 .1L.1 35.8h39.7L20 0zm-1.7 7.2l14.5 26.4H3.6L18.3 7.3z"
          fill="#fff"
          fillRule="nonzero"
        />
      </svg>
    </div>
    <div className="clocks">
      {nows.map(({name, path, ext, now}) =>
        <a href={`https://zeit.co/now-examples/monorepo/4csp3st7w/source?f=src/${path}/index${ext}`} target="_blank" title={name} key={path}>
          <Time
            name={name}
            path={path}
            now={now}
          />
        </a>
      )}
    </div>
    <div className="intro">
      <hr/>
      <h2>What is this?</h2>
      <p>We built this deployment to showcase the power and flexibility of <a href="https://zeit.co/blog/now-2" target="_blank">Now 2.0</a>. It's organized as a monorepo that combines multiple technologies.</p>
      <p>The entrypoint to this deployment is a Next.js application, compiled to serverless functions that server-render on-demand.</p>
      <p>Thanks to our <a href="https://zeit.co/docs/v2/deployments/builders/overview" title="builders" target="_blank">builders</a>, you are not limited to just static or dynamic, Go or Node.js. The possibilities are endless.</p>
    </div>
    <style jsx global>{`
      * {
        box-sizing: border-box;
      }
      html, body {
        height: 100%;
      }
      body {
        margin: 0;
        color: white;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing:grayscale;
        background: radial-gradient(circle, #333, #333 1px, #000 1px, #000);
        background-size: 28px 28px;
        background-position: center;
        font-size: 18px;
        line-height: 1.6;
        font-weight: 400;
      }
      a {
        text-decoration: none;
        color: white;
      }
      strong {
        color: white;
        font-weight: 600;
      }
      code {
        font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono, Bitstream Vera Sans Mono, Courier New, monospace, serif;
        font-size: 0.9em;
      }
      code::before,
      code::after {
        content: '\`';
      }
      ::selection{ background: #f81ce5; color: white; }
      ::-moz-selection{ background: #f81ce5; color: white; }
      .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        max-width: 100%;
        width: 1080px;
        min-height: 100vh;
        margin: auto;
        padding: 30px 20px;
      }
      .logo {
        margin: 30px 0 20px;
      }
      .intro {
        text-align: left;
        max-width: 640px;
      }
      .intro a {
        margin-right: .15em;
        border-bottom: 1px solid;
      }
      h2 {
        font-size: 30px;
      }
      hr {
        display: none;
        border: none;
        border-bottom: 1px solid #666;
        width: 100px;
        margin: 30px 0;
      }
      .clocks {
        display: flex;
        flex-wrap: wrap;
        flex: 1;
        align-items: center;
        justify-content: center;
        width: 100%;
        margin: 0 -10px;
        padding: 40px 0;
        max-height: 500px;
      }
      .clocks a {
        position: relative;
        flex: 1 0 25%;
        text-align: center;
        padding: 10px;
        margin: 20px 0;
        font-size: 17px;
        transition: all .1s ease;
      }
      .clocks a:hover {
        box-shadow: 0 0 0 1px #666;
      }
      .clock span {
        font-weight: 700;
      }
      .clock time {
        display: block;
        height: 3.2em;
        font-weight: 700;
        color: #fff;
        animation: pulse 1s forwards;
      }
      @keyframes pulse {
        from {
          color: #fff;
        }
        to {
          color: #bbb;
        }
      }
      @media screen and (max-width: 960px) {
        .clocks a {
          flex: 1 0 50%;
          font-size: 20px;
        }
      }
      @media screen and (max-width: 480px) {
        .clocks a {
          flex: 1 0 100%;
        }
        .clocks {
          max-height: unset;
        }
        hr {
          display: block;
        }
      }
    `}</style>
  </div>

Page.getInitialProps = async ({req}) => {
  const baseUrl = `https://${req.headers.host}/api`
  const nows = await Promise.all(langs.map(async ({name, path, ext}) => {
    const now = await (await fetch(`${baseUrl}/${path}`)).text()
    return {name, path, now, ext}
  }))

  return { nows }
}

export default Page

As you might noticed we have a component called time.js, lets create that one now. Create a folder named components with a file named time.js on it and add the following code:

import React from 'react'
import 'isomorphic-unfetch'

export default class extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      now: props.now
    }
  }

  componentDidMount() {
    const { path } = this.props
    const url = `${location.href}api/${path}`

    const update = async () => {
      try {
        const res = await fetch(url)
        if (res.ok) {
          const now = (await res.text()).trim()
          if (now !== this.state.now) {
            this.setState({now})
          }
        } else {
          console.log(`res not ok from ${url}`)
        }
      } catch (err) {
        console.error(`Could not fetch time from ${url}`)
      }
      this.timeout = setTimeout(update, 1000)
    }

    this.timeout = setTimeout(update, 1000)
  }

  componentWillUnmount() {
    clearTimeout(this.timeout)
  }

  render () {
    const { name } = this.props
    const { now } = this.state
    return (
      <div className="clock">
        The current time,<br/> according to <span>{name}</span>, is: <time key={now}>{now}</time>
      </div>
    )
  }
}

Summary

By now, your folder tree should look like this:

- api
    - go
        - index.go
    - node
        - index.js
    - php
        - index.php
    - python
        - index.py
- www
    - components
        - time.js
    - pages
        index.js
    - package.json

Deploy with Now

First we need to create a now.json configuration file to instruct Now how to build the project.

For this example we will be using our newest version Now 2.0.

By adding the version key to the now.json file, we can specify which Now Platform version to use.

We also need to define each builders we would like to use. Builders are modules that take a deployment's source and return an output, consisting of either static files or dynamic Lambdas.

In this case we are going to use @now/go to build and deploy the all GoLang files, @now/node to build and deploy the all JavasScript files, @now/php to build and deploy the all PHP files, @now/python to build and deploy the all Python files, and finally @now/next to build and deploy the our Next.js application. We will also define a name for our project (optional).

Next, we will add a routes key, which will handle routing for our Monorepo; pointing the contents from www to our webroot / and the contents from api to /api.

{
    "version": 2,
    "name": "monorepo",
    "builds": [
        { "src": "www/package.json", "use": "@now/next" },
        { "src": "api/go/*.go", "use": "@now/go" },
        { "src": "api/python/*.py", "use": "@now/python" },
        { "src": "api/php/*.php", "use": "@now/php" },
        { "src": "api/node/*.js", "use": "@now/node" }
    ],
    "routes": [
        { "src": "/api/(.*)", "dest": "/api/$1" },
        { "src": "/(.*)", "dest": "/www/$1" }
    ]
}

Visit our documentation for more information on the now.json configuration file.

We are now ready to deploy the app.

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