Add inspector tab

lib/devtools-inspector.js

@@ -0,0 +1,147 @@
+/* eslint-env browser */
+import http from 'http'
+import { WebSocketServer } from 'ws'
+import { Client } from 'pear-inspect'
+
+customElements.define('devtools-inspector', class extends HTMLElement {
+  constructor () {
+    super()
+    this.template = document.createElement('template')
+    this.template.innerHTML = `
+      <div>
+        <style>
+          #add-key {
+            width: 100%;
+          }
+
+          #add-key-error {
+            color: red;
+          }
+        </style>
+
+        <h1>Inspector</h1>
+        <div>
+          This acts as a link between chrome://inspect and debugging Pear apps
+        </div>
+        <ol>
+          <li>Run a pear app with "pear dev . --inspect"</li>
+          <li>The outputted key should be added here</li>
+          <li>In Chrome, open chrome://inspect and the app should appear under Targets</li>
+        </ol>
+        <div>
+          <form id="add-key-form">
+            <input id="add-key" type="text" placeholder="Id given when running pear with --inspect"/>
+            <p id="add-key-error"></p>
+          </form>
+        </div>
+        <h3 id="no-apps">No apps availble. Add a key above, to start debugging.</h3>
+        <div id="apps"></div>
+      </div>
+    `
+    this.root = this.attachShadow({ mode: 'open' })
+    this.root.appendChild(this.template.content.cloneNode(true))
+
+    this.$addKeyForm = this.root.querySelector('#add-key-form')
+    this.$addKey = this.root.querySelector('#add-key')
+    this.$addKeyError = this.root.querySelector('#add-key-error')
+    this.$apps = this.root.querySelector('#apps')
+    this.$noApps = this.root.querySelector('#no-apps')
+    this.apps = new Map()
+
+    this.$addKeyForm.addEventListener('submit', e => {
+      e.preventDefault()
+      const key = this.$addKey.value
+      if (key.length === 0) {
+        this.$addKeyError.textContent = ''
+        return
+      }
+      if (key.length !== 64) {
+        this.$addKeyError.textContent = 'Key needs to be 64 characters long'
+        return
+      }
+
+      const sessionId = generateUuid()
+      this.apps.set(sessionId, { publicKey: key })
+      this.$addKey.value = ''
+      this.$addKeyError.textContent = ''
+      this.renderApps()
+    })
+
+    const httpServer = http.createServer()
+    const wsServer = new WebSocketServer({ noServer: true })
+
+    httpServer.listen(9229, () => console.log('[httpServer] running on port 9229'))
+    httpServer.on('request', (req, res) => {
+      if (req.url !== '/json/list') {
+        res.writeHead(404)
+        res.end()
+        return
+      }
+
+      const targets = [...this.apps].map(([sessionId]) => ({
+        description: 'node.js instance', // `Pear app: ${app.name}`,
+        devtoolsFrontendUrl: `devtools://devtools/bundled/js_app.html?experiments=true&v8only=true&ws=127.0.0.1:9229/${sessionId}`,
+        devtoolsFrontendUrlCompat: `devtools://devtools/bundled/inspector.html?experiments=true&v8only=true&ws=127.0.0.1:9229/${sessionId}`,
+        faviconUrl: 'https://nodejs.org/static/images/favicons/favicon.ico',
+        id: sessionId,
+        title: 'index.js',
+        type: 'node',
+        url: `file:///path/to/some/file/index.js`,
+        webSocketDebuggerUrl: `ws://127.0.0.1:9229/${sessionId}`
+      }))
+
+      res.writeHead(200, {
+        'Content-Type': 'application/json; charset=UTF-8',
+        'Cache-Control': 'no-cache',
+        'Content-Length': JSON.stringify(targets).length
+      })
+      res.end(JSON.stringify(targets))
+    })
+    httpServer.on('upgrade', (request, socket, head) => {
+      console.log(`[httpServer] UPGRADE. url=${request.url}`)
+      const sessionId = request.url.substr(1)
+      const sessionIdExists = this.apps.has(sessionId)
+      if (!sessionIdExists) return socket.destroy()
+
+      wsServer.handleUpgrade(request, socket, head, ws => wsServer.emit('connection', ws, request))
+    })
+
+    wsServer.on('connection', (devtoolsSocket, request) => {
+      const sessionId = request.url.substr(1)
+      const app = this.apps.get(sessionId)
+      if (!app) return devtoolsSocket.destroy()
+      const { publicKey } = app
+      const inspectorClient = new Client({ publicKey: Buffer.from(publicKey, 'hex') })
+      inspectorClient.on('message', msg => {
+        devtoolsSocket.send(JSON.stringify(msg))
+      })
+      devtoolsSocket.on('message', msg => {
+        inspectorClient.send(JSON.parse(msg))
+      })
+    })
+  }
+
+  renderApps () {
+    const content = [...this.apps.values()].map(app => `
+      <div>
+        <div>Public key: ${app.publicKey}</div>
+      </div>
+    `)
+    this.$apps.innerHTML = content
+
+    if (this.apps.size > 0) this.$noApps.remove()
+  }
+})
+
+// Can't use `uuid` module for some reason as it results in a throw with `crypto` when importing
+function generateUuid () {
+  var result, i, j
+  result = ''
+  for (j = 0; j < 32; j++) {
+    if (j == 8 || j == 12 || j == 16 || j == 20)
+      result = result + '-'
+    i = Math.floor(Math.random() * 16).toString(16)
+    result = result + i
+  }
+  return result
+}