Is it possible to run `GeckoSession` in background?

[mta452]

I want to execute some javascript code only with GeckSession. As far as I have explored the API, there doesn't seem to be a direct way to do this. So I have written a small web page which executes the javascript code on load and then I use a prompt to tell the app about the output. This approach was working until I tried to execute the code in a background thread. I started getting warnings regarding main thread in Logcat. Now I want to execute this piece of code hundreds of times so the performance is very slow if I just use the main thread. Is there any work around to fullfil my use case?

Here's the relevant piece of code I currently have:

suspend fun read(html: String) = suspendCoroutine { continuation ->
    CoroutineScope(Dispatchers.Main).launch {
        val file = prepareFile(html)

        val settings = GeckoSessionSettings.Builder().build()
        val session = GeckoSession(settings)
        session.open(runtime)
        session.promptDelegate = object : GeckoSession.PromptDelegate {
            override fun onTextPrompt(
                session: GeckoSession,
                prompt: GeckoSession.PromptDelegate.TextPrompt
            ): GeckoResult<GeckoSession.PromptDelegate.PromptResponse?>? {
                try {
                    when (prompt.message) {
                        "readability-result" -> {
                            val html = (prompt.defaultValue ?: "").trim()
                            if (html.isNotEmpty()) {
                                continuation.resume(html)
                            } else {
                                continuation.resume(null)
                            }
                        }

                        "readability-error" -> {
                            continuation.resume(null)
                        }
                    }

                    prompt.dismiss()
                } catch (e: Exception) {
                    e.printStackTrace()
                    continuation.resume(null)
                } finally {
                    session.close()
                    safeDelete(file)
                }

                return super.onTextPrompt(session, prompt)
            }
        }

        session.loadUri("file://${file.absolutePath}")
    }
}

[jonalmeida]

@mta452 I think what you want is to call or ensure geckoSession.setActive(true) is set.

Opening a session doesn't mean that it is active.