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Uncaught exceptions aren't catched or rejected #111

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Merged
merged 1 commit into from
May 7, 2020
Merged

Uncaught exceptions aren't catched or rejected #111

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16 changes: 12 additions & 4 deletions js/load-image.js
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,9 @@
// Not using Promises
if (resolve) resolve(img, data)
return
} else if (img instanceof Error) {
reject(img)
return
}
data = data || {} // eslint-disable-line no-param-reassign
data.image = img
Expand Down Expand Up @@ -159,10 +162,15 @@

loadImage.onload = function (img, event, file, url, callback, options) {
revokeHelper(url, options)
loadImage.transform(img, options, callback, file, {
originalWidth: img.naturalWidth || img.width,
originalHeight: img.naturalHeight || img.height
})

try {
loadImage.transform(img, options, callback, file, {
originalWidth: img.naturalWidth || img.width,
originalHeight: img.naturalHeight || img.height
})
} catch (error) {
callback(error)
}
Comment on lines +165 to +173
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@AndyOGo AndyOGo May 6, 2020 •
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@blueimp This should now hanlde any uncaught exceptions in any transformations, if I understood the system correctly 🤔

Edit: Meanwhile I made a local overwrite and it catches all uncaught exceptions.

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Yes, that's the right location for the try...catch wrapper. :)

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Great. Any tests you would like to be added?

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I think it's fine to include this with just the existing tests.

Although it would be good to test this specific scenario (huge canvas sizes) as well, the tradeoff would likely be largely increased memory requirements for running the tests.

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One other item I'm still thinking about though is that the Promise executor already has an implicit try...catch around it, so it's only necessary for the callback style.
I might add this improvement after the merge though, since it requires some restructuring.

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hmh, I used the Promise API, but .catch() hanlder wasn't called 🤔

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You're right, the Promise executor cannot catch errors that happen asynchronously.
So everything is fine as is. :)

}

loadImage.createObjectURL = function (file) {
Expand Down