EvaluateScriptAsync stops working after about 15 minutes

[Egzscure]

Is there an existing issue for this?

• I have searched both open/closed issues, no issue already exists.

CefSharp Version

137.0.100

Operating System

Windows 10

Architecture

x64

.Net Version

4.6.2

Implementation

WinForms

Reproduction Steps

If i run EvaluateScriptAsync, it works fine, even just setting a timer to run the samescript every few minutes, works fine, after about 15minutes, it doesnt work anymore.

I tested changing versions and it works fine on cefsharp 120.2.70, but im not sure which update, but i think after 121 something was broken, everytime a script runs after 15minutes of the ChromiumWebBrowser beeing initialized, it will no longer run any javascript injected with browser.EvaluateScriptAsync.

browser.EvaluateScriptAsync will return null and not run the script at all.

can test with a simple alert('hello world');, make it run every minute, in a simple static page, after about 15 minutes, it will no longer run the script that shows this alert, or any other script at all called with browser.EvaluateScriptAsync

This issue persists in all the versions until the current version, im surprised nobody else is complaining about this.

If i call the method ".reload()" i can again run scripts for another 15 minutes.. but its horrible experience.

Expected behavior

browser.EvaluateScriptAsync should run the script just like all the cefsharp versions until 120.2.70 , somewhere after this version, after around 15 minutes, the script no longer runs. Seems to be after an exact time of seconds passed, i didnt take note exactly of how many seconds it is, but for sure around 15 minutes.

It is not related to my project as i created an empty project and the same issue occurred

Actual behavior

after 15 minutes aproximately of initializing ChromiumWebBrowser, calling browser.EvaluateScriptAsync returns null and no longer runs the script passed in it, even a simple alert

Regression?

Does not occur on cefsharp versions <= 120.2.70

Known Workarounds

Only workaround is reloading it, calling the ".reload()" but still it makes the experience awful having to reload every 15 minutes to be able to continue running scripts.

Does this problem also occur in the CEF Sample Application

Yes using WPF/OffScreen command line args

Other information

No response

[Egzscure]

Update:
Now i made a test with ExecuteScriptAsync, this issue does not occur if i run ExecuteScriptAsync, HOWEVER:
If i try to access CefSharp.PostMessage after 10 minutes , the same issue occurs, it doesnt work.

Its like after 10minutes, the browser object, forgets itself, forgets it exists.

After 10 minutes, calling ExecuteScriptAsync with " CefSharp.PostMessage" in the js, does not work, and EvaluateScriptAsync does not work at all.

But only after 10 minutes

ExecuteScriptAsync will continue to work if i simply "alert('hello world');" i dont know what black magic is this

It feels like its exactly 10 minutes, it must be something with CefSharp, some update that broke things

Edit:
I Believe my issue is related to #4621
as i tried the solution by yevklim as an alternative to EvaluateScriptAsync, and it works in the first 10 minutes just like 'EvaluateScriptAsync', but after 10 minutes, this "CefSharp.PostMessage" no longer works.

[amaitland]

Thanks for the detailed testing, we'll need to capture some more details then raise an issue at https://github.com/chromiumembedded/cef/issues

Please make sure you've read the first few paragraphs of https://github.com/cefsharp/CefSharp/wiki/General-Usage

Its like after 10minutes, the browser object, forgets itself, forgets it exists.

Likely a Chromium behavior, might be going to sleep due to inactivity? Are you interesting with the browser in any way? e.g. mouse or keyboard?

browser.EvaluateScriptAsync will return null and not run the script at all.

EvaluateScriptAsync returns a response object, what is the response message say?

I Believe my issue is related to #4621

Are you seeing the same error message returned?

Only workaround is reloading it, calling the ".reload()" but still it makes the experience awful having to reload every 15 minutes to be able to continue running scripts.

Did you try calling ExecuteScriptAsync occasionally to keep the browser alive?

Are there any errors in the log file?

ExecuteScriptAsync will continue to work if i simply "alert('hello world');" i dont know what black magic is this

They are very very different, ExecuteScriptAsync simply calls https://cef-builds.spotifycdn.com/docs/138.0/classCefFrame.html#ab589458e9d491eca59d269f957b5fd7a

EvaluateScriptAsync is complex, sends a process message to the render process where we call https://cef-builds.spotifycdn.com/docs/138.0/classCefV8Context.html#a160b647d434ed0bcd8518c0042e7d991 evaluates the script, returns the response.

Sounds like the render process is no longer active, which is not something we have any direct control over. So will likely need to be fixed in CEF (upstream)