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[RNMobile][Embed Block] Revert workaround for loading glitch #35674

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fluiddot
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@fluiddot fluiddot commented Oct 15, 2021

Description

This PR reverts the changes introduced in #33574.

How has this been tested?

Follow the testing instructions from the reverted PR #33574 and verify that the original issue is not happening.

Screenshots

N/A

Types of changes

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@fluiddot fluiddot added [Type] Bug An existing feature does not function as intended [Block] Embed Affects the Embed Block labels Oct 15, 2021
@fluiddot fluiddot self-assigned this Oct 15, 2021
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Size Change: 0 B

Total Size: 1.07 MB

ℹ️ View Unchanged
Filename Size
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@jd-alexander
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jd-alexander commented Oct 20, 2021

I am currently seeing this issue on WP Android at times when I spin up this solution in metro server. So I will run the cases mentioned and the UI state changes will occur as expected and then randomly this bug appears. I am working on capturing it due to it occurring randomly.

@fluiddot
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I am currently seeing this issue on WP Android at times when I spin up this solution in metro server. So I will run the cases mentioned and the UI state changes will occur as expected and then randomly this bug appears. I am working on capturing it due to it occurring randomly.

Right, I've just tested on an Android device and I managed to reproduce it. I guess the original issue was maybe easier to reproduce on Android 🤔 .

I'll try to figure out a new approach to prevent the original issue 🔧 .

@fluiddot
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I am currently seeing this issue on WP Android at times when I spin up this solution in metro server. So I will run the cases mentioned and the UI state changes will occur as expected and then randomly this bug appears. I am working on capturing it due to it occurring randomly.

Right, I've just tested on an Android device and I managed to reproduce it. I guess the original issue was maybe easier to reproduce on Android 🤔 .

I'll try to figure out a new approach to prevent the original issue 🔧 .

I finally found the culprit of this behavior:

We're using the selector isRequestingEmbedPreview to determine if the embed preview is being fetched, however, it doesn't guarantee that it will return true right after calling the selector getEmbedPreview with an URL. The true value is returned after a couple of renders which produces the loading glitch described in the original issue.

The isRequestingEmbedPreview selector internally checks the isResolving status of the getEmbedPreview resolver, which initially returns undefined until the API request starts.

Click here to see code references

export const isRequestingEmbedPreview = createRegistrySelector(
( select ) => ( state, url ) => {
return select( STORE_NAME ).isResolving( 'getEmbedPreview', [ url ] );
}
);

export function isResolving( state, selectorName, args = [] ) {
return getIsResolving( state, selectorName, args ) === true;
}

/**
* Returns the raw `isResolving` value for a given selector name,
* and arguments set. May be undefined if the selector has never been resolved
* or not resolved for the given set of arguments, otherwise true or false for
* resolution started and completed respectively.
*
* @param {State} state Data state.
* @param {string} selectorName Selector name.
* @param {unknown[]} args Arguments passed to selector.
*
* @return {boolean | undefined} isResolving value.
*/
export function getIsResolving( state, selectorName, args ) {
const map = get( state, [ selectorName ] );
if ( ! map ) {
return undefined;
}
return map.get( args );
}

In the following logs, you can see how the isResolving status and other related variables, change in different renders right after changing the URL of the embed.

Click here to see logs
  1. Changing URL: {"new": "https://www.youtube.com/watch?v=ssfHW5lwFZg", "previous": undefined}

  2. {"fetching": false, "hasPreview": false, "isResolving": undefined, "url": "https://www.youtube.com/watch?v=ssfHW5lwFZg"}
    Right after the URL changes, the getEmbedPreview selector is called but the isResolving status remains undefined for a couple of renders.

  3. {"fetching": true, "hasPreview": false, "isResolving": true, "url": "https://www.youtube.com/watch?v=ssfHW5lwFZg"}
    When the resolver of the getEmbedPreview selector is triggered and the API request starts, the isResolving status changes to true, as well as the result of isRequestingEmbedPreview returned in the "fetching" variable.

  4. {"fetching": true, "hasPreview": true, "isResolving": true, "url": "https://www.youtube.com/watch?v=ssfHW5lwFZg"}
    At this point, the API request finished as the preview is ready (hasPreview is true), but the isResolving status is still true. Looks like it requires another cycle to update the value.

  5. {"fetching": false, "hasPreview": true, "isResolving": false, "url": "https://www.youtube.com/watch?v=ssfHW5lwFZg"}
    Once the preview is ready and the resolver has finished, isResolving and fetching are false. This value will remain until the cached value is invalidated.

Following the approach I did for the reusable block to determine the loading state (reference), I'm going to check if the resolver has finished for this purpose. So the following isResolving values, undefined and false, will tell us if the embed preview is being fetched after the URL changed. I'll open a new PR with this workaround and reference it here 🎊 .

@fluiddot
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Following the approach I did for the reusable block to determine the loading state (reference), I'm going to check if the resolver has finished for this purpose. So the following isResolving values, undefined and false, will tell us if the embed preview is being fetched after the URL changed. I'll open a new PR with this workaround and reference it here 🎊 .

@jd-alexander here is the PR #35798 regarding the new approach for this issue, let me know if you could take a look, thanks 🙇 .

@jd-alexander
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Following the approach I did for the reusable block to determine the loading state (reference), I'm going to check if the resolver has finished for this purpose. So the following isResolving values, undefined and false, will tell us if the embed preview is being fetched after the URL changed. I'll open a new PR with this workaround and reference it here 🎊 .

@jd-alexander here is the PR #35798 regarding the new approach for this issue, let me know if you could take a look, thanks 🙇 .

Thanks @fluiddot I will take a look. Thanks for the logs and explanation here about the root cause of the issue.

@fluiddot
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Closing this PR in favor of #35798.

@fluiddot fluiddot closed this Oct 21, 2021
@fluiddot fluiddot deleted the rnmobile/fix/embed-block-revert-fix-33574 branch October 21, 2021 15:08
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