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https://issues.apache.org/jira/browse/GUACAMOLE-827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739687#comment-17739687
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Nick Couchman commented on GUACAMOLE-827:
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[~jcaple]: Sorry, this got lost in the list of low-priority issues - if you're
still around, I'm wondering if you could:
* Confirm that it's still an issue in the most recent versions of Guacamole?
* Submit a pull request with the solution you've developed for it so that we
can discuss and possibly get it merged?
> BlobWrite FileReader Busy State When Writing Data To VM
> -------------------------------------------------------
>
> Key: GUACAMOLE-827
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-827
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-common-js
> Affects Versions: 1.0.0
> Environment: Google Chrome
> Reporter: James Caple
> Priority: Trivial
> Labels: newbie, patch
>
> When creating a custom HTML/JS Guacamole client to write files to a VM using
> the BlobWriter JS class, an error similar to the following is generated
> (error is from running the code in Google Chrome):
>
> zone.js:1495 Uncaught (in promise) DOMException: Failed to execute
> 'readAsArrayBuffer' on 'FileReader': The object is already busy reading Blobs.
> at _global.<computed>.<computed> [as readAsArrayBuffer]
> (https://redacted/polyfills.6e39da16eddfecb84434.js:3830:60)
> at readNextChunk (https://redacted/main.51a4f7c78afe09ae8d5e.js:168269:20)
> at
> push../src/app/components/core/desktop/js/BlobWriter.js.redacted.ArrayBufferWriter.sendMoreChunks
> [as onack] (https://redacted/main.51a4f7c78afe09ae8d5e.js:168295:17)
> at
> push../node_modules/guacamole-common-js/dist/guacamole-common.js.Guacamole.OutputStream.stream.onack
> (https://redacted/main.51a4f7c78afe09ae8d5e.js:168396:25)
> at ack (https://redacted/main.51a4f7c78afe09ae8d5e.js:114024:28)
> at
> push../node_modules/guacamole-common-js/dist/guacamole-common.js.Guacamole.HTTPTunnel.tunnel.oninstruction
> (https://redacted/main.51a4f7c78afe09ae8d5e.js:114685:13)
> at XMLHttpRequest.parseResponse [as
> __zone_symbol__ON_PROPERTYreadystatechange]
> (https://redacted/main.51a4f7c78afe09ae8d5e.js:123910:40)
> at XMLHttpRequest.wrapFn
> (https://redacted/polyfills.6e39da16eddfecb84434.js:3667:39)
> at
> ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask
> (https://redacted/polyfills.6e39da16eddfecb84434.js:2758:31)
> at Object.onInvokeTask
> ([https://redacted/main.51a4f7c78afe09ae8d5e.js:33312:33)]
>
> While a file would ultimately get written to the remote VM, it is never a
> complete file given the error above, which seems to be indicative of the
> asynchronous nature of the file transfer activity and the contentious use of
> the BlobWriter FileReader object.
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