ReferenceError: setTimeout is not defined

[hex0wn]

Here is my code

require 'mini_racer'
ctx = MiniRacer::Context.new
ctx.eval('setTimeout(function(){console.log(1)}, 1000)')

The error info is

Traceback (most recent call last):
	7: from 1.rb:3:in `<main>'
	6: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:176:in `eval'
	5: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:176:in `synchronize'
	4: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:178:in `block in eval'
	3: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:264:in `timeout'
	2: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:179:in `block (2 levels) in eval'
	1: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:179:in `eval_unsafe'
JavaScript at <anonymous>:1:1: ReferenceError: setTimeout is not defined (MiniRacer::RuntimeError)

I tried in CentOS Linux release 7.5.1804 and Ubuntu 16.04.5 LTS

[SamSaffron]

setTimeout and setInterval are not defined by v8, the platform needs to provide them. if you want timeout you are going to have to implement in Ruby and attach the method.

…

On Fri, Mar 29, 2019 at 8:28 PM hex0wn ***@***.***> wrote: Here is my code require 'mini_racer' ctx = MiniRacer::Context.new ctx.eval('setTimeout(function(){console.log(1)}, 1000)') The error info is Traceback (most recent call last): 7: from 1.rb:3:in `<main>' 6: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:176:in `eval' 5: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:176:in `synchronize' 4: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:178:in `block in eval' 3: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:264:in `timeout' 2: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:179:in `block (2 levels) in eval' 1: from /usr/local/rvm/gems/ruby-2.5.3/gems/mini_racer-0.2.4/lib/mini_racer.rb:179:in `eval_unsafe' JavaScript at <anonymous>:1:1: ReferenceError: setTimeout is not defined (MiniRacer::RuntimeError) I tried in CentOS Linux release 7.5.1804 and Ubuntu 16.04.5 LTS — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#135>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAUXantwBeHkJ9gPOVjGkUW1WFIAVJfks5vbdUKgaJpZM4cR61g> .

[ianks]

I was thinking it might be useful to attach an (optional) event loop to a mini_racer context. Some libs require and event loop, so for now I just polyfill it like:

// Pseudo since I'm on phone
function setTimeout(func) { func() }

Obvious correctness issues there, but "It Works" ™️.

There will be some complexity ensuring event loop is properly shut down and before exit, but it night be a worthwhile edition.

[SamSaffron]

Technically this is doable today I have a reasonably efficient implementation of timer thread at:

https://github.com/SamSaffron/message_bus/blob/master/lib/message_bus/timer_thread.rb

It would be pretty straight forward to glue it on by attaching stuff. It is a bit tricky though getting full details of the func being called out of the boundary, so you would may need some sort of weakmap or something.