fix: use stdio for CDP instead of TCP

packages/launcher/lib/browsers.ts

@@ -97,6 +97,7 @@ export function launch (
   browser: FoundBrowser,
   url: string,
   args: string[] = [],
+  opts: { pipeStdio?: boolean } = {},
 ) {
   log('launching browser %o', { browser, url })
 
@@ -110,7 +111,15 @@ export function launch (
 
   log('spawning browser with args %o', { args })
 
-  const proc = cp.spawn(browser.path, args, { stdio: ['ignore', 'pipe', 'pipe'] })
+  const stdio = ['ignore', 'pipe', 'pipe']
+
+  if (opts.pipeStdio) {
+    // also pipe stdio 3 and 4 for access to debugger protocol
+    stdio.push('pipe', 'pipe')
+  }
+
+  // @ts-ignore
+  const proc = cp.spawn(browser.path, args, { stdio })
 
   proc.stdout.on('data', (buf) => {
     log('%s stdout: %s', browser.name, String(buf).trim())

packages/server/__snapshots__/5_cdp_spec.ts.js

@@ -1,4 +1,4 @@
-exports['e2e cdp / handles disconnections as expected'] = `
+exports['e2e cdp / with TCP transport / handles disconnections as expected'] = `
 
 ====================================================================================================
 
@@ -59,4 +59,67 @@ Error: connect ECONNREFUSED 127.0.0.1:7777
     ✖  1 of 1 failed (100%)                     XX:XX        -        -        1        -        -  
 
 
-`
+`
+
+exports['e2e cdp / with stdio transport / falls back to connecting via tcp when stdio cannot be connected'] = `
+
+====================================================================================================
+
+  (Run Starting)
+
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ Cypress:    1.2.3                                                                              │
+  │ Browser:    FooBrowser 88                                                                      │
+  │ Specs:      1 found (spec.ts)                                                                  │
+  │ Searched:   cypress/integration/spec.ts                                                        │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+
+────────────────────────────────────────────────────────────────────────────────────────────────────
+                                                                                                    
+  Running:  spec.ts                                                                         (1 of 1)
+Warning: Cypress failed to connect to Chrome via stdio after 1 second. Falling back to TCP...
+Connecting to Chrome via TCP was successful, continuing with tests.
+
+
+  passes
+    ✓ passes
+
+
+  1 passing
+
+
+  (Results)
+
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ Tests:        1                                                                                │
+  │ Passing:      1                                                                                │
+  │ Failing:      0                                                                                │
+  │ Pending:      0                                                                                │
+  │ Skipped:      0                                                                                │
+  │ Screenshots:  0                                                                                │
+  │ Video:        true                                                                             │
+  │ Duration:     X seconds                                                                        │
+  │ Spec Ran:     spec.ts                                                                          │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+
+
+  (Video)
+
+  -  Started processing:  Compressing to 32 CRF                                                     
+  -  Finished processing: /XXX/XXX/XXX/cypress/videos/spec.ts.mp4                         (X second)
+
+
+====================================================================================================
+
+  (Run Finished)
+
+
+       Spec                                              Tests  Passing  Failing  Pending  Skipped  
+  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
+  │ ✔  spec.ts                                  XX:XX        1        1        -        -        - │
+  └────────────────────────────────────────────────────────────────────────────────────────────────┘
+    ✔  All specs passed!                        XX:XX        1        1        -        -        -  
+
+
+`

packages/server/lib/browsers/chrome.ts

@@ -13,6 +13,7 @@ import * as CriClient from './cri-client'
 import * as protocol from './protocol'
 import utils from './utils'
 import { Browser } from './types'
+import errors from '../errors'
 
 // TODO: this is defined in `cypress-npm-api` but there is currently no way to get there
 type CypressConfiguration = any
@@ -35,6 +36,9 @@ type ChromePreferences = {
   localState: object
 }
 
+const staticCdpPort = Number(process.env.CYPRESS_REMOTE_DEBUGGING_PORT)
+const stdioTimeoutMs = Number(process.env.CYPRESS_CDP_TARGET_TIMEOUT) || 60000
+
 const pathToExtension = extension.getPathToExtension()
 const pathToTheme = extension.getPathToTheme()
 
@@ -173,9 +177,7 @@ const _writeChromePreferences = (userDir: string, originalPrefs: ChromePreferenc
 }
 
 const getRemoteDebuggingPort = async () => {
-  const port = Number(process.env.CYPRESS_REMOTE_DEBUGGING_PORT)
-
-  return port || utils.getPort()
+  return staticCdpPort || utils.getPort()
 }
 
 /**
@@ -243,19 +245,47 @@ const _disableRestorePagesPrompt = function (userDir) {
   .catch(() => { })
 }
 
+const useStdioCdp = (browser) => {
+  return (
+    // CDP via stdio doesn't seem to work in browsers older than 72
+    // @see https://github.com/cyrus-and/chrome-remote-interface/issues/381#issuecomment-445277683
+    browser.majorVersion >= 72
+    // allow users to force TCP by specifying a port in environment
+    && !staticCdpPort
+  )
+}
+
 // After the browser has been opened, we can connect to
 // its remote interface via a websocket.
-const _connectToChromeRemoteInterface = function (port, onError) {
-  // @ts-ignore
-  la(check.userPort(port), 'expected port number to connect CRI to', port)
+const _connectToChromeRemoteInterface = function (browser, process, port, onError) {
+  const connectTcp = () => {
+    // @ts-ignore
+    la(check.userPort(port), 'expected port number to connect CRI to', port)
+
+    debug('connecting to Chrome remote interface at random port %d', port)
+
+    return protocol.getWsTargetFor(port)
+    .then((wsUrl) => {
+      debug('received wsUrl %s for port %d', wsUrl, port)
+
+      return CriClient.create({ target: wsUrl }, onError)
+    })
+  }
+
+  if (!useStdioCdp(browser)) {
+    return connectTcp()
+  }
+
+  return CriClient.create({ process }, onError)
+  .timeout(stdioTimeoutMs)
+  .catch(Bluebird.TimeoutError, async () => {
+    errors.warning('CDP_STDIO_TIMEOUT', browser.displayName, stdioTimeoutMs)
 
-  debug('connecting to Chrome remote interface at random port %d', port)
+    const client = await connectTcp()
 
-  return protocol.getWsTargetFor(port)
-  .then((wsUrl) => {
-    debug('received wsUrl %s for port %d', wsUrl, port)
+    errors.warning('CDP_FALLBACK_SUCCEEDED', browser.displayName)
 
-    return CriClient.create(wsUrl, onError)
+    return client
   })
 }
 
@@ -398,6 +428,10 @@ export = {
     args.push(`--remote-debugging-port=${port}`)
     args.push('--remote-debugging-address=127.0.0.1')
 
+    if (useStdioCdp(browser)) {
+      args.push('--remote-debugging-pipe')
+    }
+
     return args
   },
 
@@ -453,14 +487,16 @@ export = {
     // first allows us to connect the remote interface,
     // start video recording and then
     // we will load the actual page
-    const launchedBrowser = await utils.launch(browser, 'about:blank', args)
+    const launchedBrowser = await utils.launch(browser, 'about:blank', args, {
+      pipeStdio: useStdioCdp(browser),
+    })
 
     la(launchedBrowser, 'did not get launched browser instance')
 
     // SECOND connect to the Chrome remote interface
     // and when the connection is ready
     // navigate to the actual url
-    const criClient = await this._connectToChromeRemoteInterface(port, options.onError)
+    const criClient = await this._connectToChromeRemoteInterface(browser, launchedBrowser, port, options.onError)
 
     la(criClient, 'expected Chrome remote interface reference', criClient)