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/**
*
* This command helps you to debug your integration tests. It stops the running browser and gives
* you time to jump into it and check the state of your application (e.g. using dev tools).
* Your terminal transforms into a [REPL](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop)
* interface that will allow you to try out certain commands, find elements and test actions on
* them.
*
* [](https://webdriver.io/images/repl.gif)
*
* If you run the WDIO testrunner make sure you increase the timeout property of the test framework
* you are using (e.g. Mocha or Jasmine) in order to prevent test termination due to a test timeout.
* Also avoid executing the command with multiple capabilities running at the same time.
*
* <iframe width="560" height="315" src="https://www.youtube.com/embed/xWwP-3B_YyE" frameborder="0" allowfullscreen></iframe>
*
* <example>
:debug.js
it('should demonstrate the debug command', () => {
$('#input').setValue('FOO')
browser.debug() // jumping into the browser and change value of #input to 'BAR'
const value = $('#input').getValue()
console.log(value) // outputs: "BAR"
})
* </example>
*
* @alias browser.debug
* @type utility
*
*/
import vm from 'vm'
import repl from 'repl'
import { runFnInFiberContext, hasWdioSyncSupport } from '@wdio/config'
import { STATIC_RETURNS, INTRO_MESSAGE } from './constants'
export default class WDIORepl {
static introMessage = INTRO_MESSAGE
constructor (config) {
this.config = Object.assign({
commandTimeout: 5000,
eval: ::this.eval,
prompt: '\u203A ',
useGlobal: true,
useColor: true
}, config)
this.isCommandRunning = false
}
eval (cmd, context, filename, callback) {
if (this.isCommandRunning) {
return
}
if (cmd && STATIC_RETURNS[cmd.trim()]) {
return callback(null, STATIC_RETURNS[cmd.trim()])
}
vm.createContext(context)
this.isCommandRunning = true
/* istanbul ignore if */
if (hasWdioSyncSupport) {
return runFnInFiberContext(
() => this._runCmd(cmd, context, callback))()
}
return this._runCmd(cmd, context, callback)
}
_runCmd (cmd, context, callback) {
try {
const result = vm.runInContext(cmd, context)
return this._handleResult(result, callback)
} catch (e) {
this.isCommandRunning = false
return callback(e)
}
}
_handleResult (result, callback) {
if (!result || typeof result.then !== 'function') {
this.isCommandRunning = false
return callback(null, result)
}
const timeout = setTimeout(
() => {
callback(new Error('Command execution timed out'))
this.isCommandRunning = false
timeout._called = true
},
this.config.commandTimeout
)
result.then((res) => {
/**
* don't do anything if timeout was called
*/
if (timeout._called) {
return
}
this.isCommandRunning = false
clearTimeout(timeout)
return callback(null, res)
}, (e) => {
/**
* don't do anything if timeout was called
*/
if (timeout._called) {
return
}
this.isCommandRunning = false
clearTimeout(timeout)
const errorMessage = e ? e.message : 'Command execution timed out'
const commandError = new Error(errorMessage)
delete commandError.stack
return callback(commandError)
})
}
start (context) {
if (this.replServer) {
throw new Error('a repl was already initialised')
}
if (context) {
const evalFn = this.config.eval
this.config.eval = (cmd, _, filename, callback) => evalFn(cmd, context, filename, callback)
}
this.replServer = repl.start(this.config)
return new Promise(
(resolve) => this.replServer.on('exit', resolve))
}
}
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