ssb-ahoy !

A module for building electron-based scuttlbutt apps. You provide a UI and plugins, and ssb-ahoy takes care of boring details for you.

Built with electron@20.3.8 and secret-stack@7

This version of electron runs Node version 18.6.1 (or something like it)

Getting started

$ npm i ssb-ahoy

Create a root file for your project:

// index.js
const ahoy = require('ssb-ahoy')
const path = require('path')

ahoy(
  'http://localhost:8080', // an address (http/file) for UI
  {
    plugins: [
      require('ssb-db'),
      require('ssb-backlinks')
    ]
  },
  (err, ssb) => {
    if (err) throw err

    console.log('ahoy started', ssb.id)
  }
)

Add a script to your package.json:

// package.json
{
  "main": "index.js",
  "scripts": {
    "start": "electron index.js"
  }
}

Run it:

$ npm start

API

ahoy(url, opts, cb)

• url String - a url to load the app UI from

  • can start with
    • http:, https: - great for local dev-servers
    • file: - useful when you bundle ui for production, electron fetches directly from file system
      • e.g. `file://${path.join(__dirname, 'dist/index.html)}'
  • required

• opts Object with properties:

  • opts.title String - the title of your app
    • will be the title of the app window
    • default: 'hello_world'
  • opts.plugins [Plugin] - an array of secret-stack plugins
    • default: []
  • opts.config Object - over-rides what's passed to secret-stack + plugins on launch
    • opts.config.path String - location your database + secret will be installed
      • default: \${envPaths.data}/ssb-ahoy/dev/\${format(opts.title)}
    • generally defaults follow ssb-config/defaults.js

• cb function callback which is run once ssb and electron have started up

ahoy(url, opts) => Promise

Convenience method which is a promisify'd version of the last method.

window.ahoy (ui window api)

There's a method exposed in the UI window, that can be used like this:

window.ahoy.getConfig()
  .then(config => {
    // could use this to connect to back end with e.g. ssb-client
    console.log(config)
  })

Templates

This repo includes two working example templates. Start simple and upgrade as your interest and time permits

• Simple Template
• Advanced Template

Building installers

Your project MUST have:

• a package.json with:
  • main pointing at the file which contains your ahoy setup (electron-builder uses this to build from)
  • script for building release

  {
    "main": "main.js",
    "script": {
      "release": "electron-builder --config builder/config.js"
    }
  }

• an electron-builder config
  • the "release" script points at this
  • putting your config in a js file means you can annotate it (you should)
  • see templates/builder/config.js for the most minimal template

Native dependencies

Scuttlebutt is built with native dependencies - libraries for cryptography/ database work that depend on lower level C libraries that need to be compiled for particular architectures (i.e. are native).

electron-builder does a great job of making sure that the versions installed are compatible with the electron environement we're running them in, but sometimes it trips up.

You can often address this by adding a script to your package.json like: json { "script": { "postinstall": "npm run fixDeps", "fixDeps": "electron-builder install-app-deps" } }

Most of the modules typically used have "prebuilds" which are just fetched from the internet. If a prebuild doesn't exist you may have to build it yourself - read the errors, you'll likely see node-gyp mentioned, which is a one common node tool for compiling dependencies.

Resouces:

• electron
  • www.electronjs.org/releases
  • CHANGELOG
• electron-builder
  • www.electron.build
  • CHANGELOG
• Apple's painful signing process:
  • https://kilianvalkhof.com/2019/electron/notarizing-your-electron-application/

---

Development

Notes

• we pin electron to an exact version here for 2 reasons:

  • ensure it's tested + stable in this module
  • help electron-builder to know exactly what it's building against

• adding electron and electron-builder to peerDependencies was done to try and make it as easy as possible to get started with ssb-ahoy. Things to take into acount if changing this:

  • build size: current example app makes an 83MB AppImage
    • if you set things up incorrectly, this will jump to 125MB+
  • not having to manually install lots of modules
  • electron-builder shouldn't need to be told what version of electron it's building for

• adding dmg-license to optionalDependencies was done to try and make it as easy as possible to get started for mac users

  • this module throws some error if you try and install it on linux
  • listing it here seems to stimulate installation of it on macs

• To inspect app.asar files:

  $ cd example/dist/installers/linux-unpacked/resources
  $ npx asar extract app.asar destfolder
  $ filelight destfolder

  • alternatively, temporarily set asar: false in electron-builder config
  • filelight is a linux tool for visually exploring folders

• electron > 20.3.8 currently breaks important sodium-native functions

  • sodium-friends/sodium-native#185
  • this is currently blocking further upgrades