generate-core-protocol.js

'use strict'

var _ = require('lodash')
var fs = require('fs')
var request = require('request-promise')

var fetchChromeProtocol = () => {

  return new Promise((resolve, reject) => {
    var protocol = {
      version: { 'major': '1', 'minor': '2' },
      domains: []
    }

    var urls = [
      'https://chromium.googlesource.com/chromium/src/+/master/third_party/WebKit/Source/core/inspector/browser_protocol.json?format=TEXT',
      'https://chromium.googlesource.com/v8/v8/+/master/src/inspector/js_protocol.json?format=TEXT'
    ]

    var fetchedProtocols = urls.map(url => {
      return request(url).then(body => {
        return JSON.parse(Buffer.from(body, 'base64').toString('utf8'))
      })
    })

    Promise.all(fetchedProtocols).then(protocols => {
      var mergedDomains = []
      protocols.forEach(protocol => {
        mergedDomains.push(...protocol.domains)
      })

      protocol.domains = mergedDomains
      resolve(protocol)
    })
  })
}

fetchChromeProtocol().then(chromeProtocol => {

  var domainList = []

  var seenList = new Map()

  // Filter domains
  chromeProtocol.domains.forEach(domain => {
    if (isRelevant(domain)) {
      domainList.push(domain)
    }
  })

  // Filter commands, events and types
  domainList.forEach(domain => {
    domain.commands = domain.commands.filter(c => isRelevant(c) ? c : false)

    if (domain.events) {
      domain.events = domain.events.filter(c => isRelevant(c) ? c : false)
    }

    if (domain.types) {
      domain.types = domain.types.filter(c => isRelevant(c) ? c : false)
    }
  })

  var protocol = chromeProtocol
  protocol.domains = domainList

  fs.writeFile('protocol.json', JSON.stringify(protocol, null, 2), function (err) {
    if (err) {
      console.log(err)
    } else {
      console.log('Core Protocol JSON file generated')
    }
  })
}).catch(err => {
  console.log('err', err)
})

function isRelevant (o) {
  if (o.experimental || o.deprecated) {
    return false
  } else {
    return true
  }
}