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rubycdp / ferrum

Headless Chrome Ruby API
https://ferrum.rubycdp.com
MIT License
1.72k stars 123 forks source link

browser.screenshot throwing a Ferrum::DeadBrowserError on Raspberry pi #19

Closed pcboy closed 4 years ago

pcboy commented 4 years ago

I encounter some issue with Ferrum on the raspberry pi 3 (raspbian). Things are overall working fine it seems, but when I try to get a screenshot a Browser is dead (Ferrum::DeadBrowserError) is thrown.

My code:

browser = Ferrum::Browser.new(logger: STDERR, timeout: 20, process_timeout: 20)
browser.goto("https://github.com")
browser.screenshot(path:"github.png")
browser.quit

Chromedriver version: ChromeDriver 74.0.3729.157 (7b16107ab85c5364cdcd0b2dea2539a1f2dc327a-refs/branch-heads/3729@{#998})

Chromium version: Chromium 74.0.3729.157 Built on Raspbian , running on Raspbian 10

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▶ 41.97464164199482 {"method":"Page.captureScreenshot","params":{"format":"png"},"id":1010}
Traceback (most recent call last):
        4: from tamanager.rb:7:in `<main>'
        3: from /home/pi/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/forwardable.rb:230:in `screenshot'
        2: from /home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/page/screenshot.rb:9:in `screenshot'
        1: from /home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/page.rb:110:in `command'
/home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/browser/client.rb:41:in `command': Browser is dead (Ferrum::DeadBrowserError)

The Page.captureScreenshot seems to take a really long time to process. I tried to increase the timeouts to 100 but it's simply waiting longer and fail.
Any idea what could be the problem? Save to pdf feature leads to the same error.

Thanks

pcboy commented 4 years ago

I just noticed something. The screenshot feature is not the problem. It looks like the whole thing is not working properly, I can't control the browser at all. If I do 2 calls to goto in a row, only the first one works, then I get the "Browser is dead" error.

Code:

browser = Ferrum::Browser.new(logger: STDERR)
browser.goto("https://github.com")
browser.goto("https://www.google.com")

Logs: 

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▶ 12.00082179500896 {"method":"Page.navigate","params":{"url":"https://www.google.com"},"id":1010}
Traceback (most recent call last):
        4: from tamanager.rb:7:in `<main>'
        3: from /home/pi/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/forwardable.rb:230:in `goto'
        2: from /home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/page.rb:66:in `goto'
        1: from /home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/page.rb:110:in `command'
/home/pi/.rvm/gems/ruby-2.6.3/gems/ferrum-0.5/lib/ferrum/browser/client.rb:41:in `command': Browser is dead (Ferrum::DeadBrowserError)
route commented 4 years ago

Sorry I don't have raspberry for a test but are you sure you have enough memory?

pcboy commented 4 years ago

I checked the available RAM and that doesn't seem to be a memory issue. As mentionned it's not only happening for screenshots but any interaction. I can't do more than one goto() for instance.

https://github.com/route/ferrum/blob/1ab9c566c29dc417d95a92a50579ecad1224de8f/lib/ferrum/browser/client.rb#L41

This is where it fails.

I checked and noticed that data is nil and @ws.messages.closed? returns true too. And @pendings equals {}.
Any idea why this situation happens?

route commented 4 years ago

You don't need chrome driver BTW, only chrome. I could also try to use the latest Chrome if possible. As for why this is happening, for some reason when you issue subsequent Page.navigate we send it to chrome and start waiting for response if nothing returned then data is nil and we check if for some reason message queue is closed which can happen only when socket is closed in case of error or when chrome dies. Try to set timeout to a higher value, it's 5 by default, try to use latest chrome, and check if chrome process really dead while setting timeout to a higher value. That's all clues so far :)

route commented 4 years ago

I'm gonna close issue for now, let me know if anything from the things I had mentioned above helped.