Feature/vfb 240

[jrmartin]

Change the datasource for the NG widget to file serve here Index of /data/VFB/i/

@ddelpiano Not all IDs have neuroglancer data in the VFB server, I used this one to test it out https://vfb.dev.metacell.us/?i=VFB_00101567&id=VFB_001012vj

Major changes by theme:

Asynchronous Layer and State Construction:

• Converted buildNeuroglassState and buildSingleInstanceLayer to async functions, enabling them to await the completion of URL building and layer configuration for each instance. [1] [2]
• Updated the React NeuroglassViewer component to use useEffect instead of useMemo for setting the iframe source, allowing for async state updates as the viewer state is constructed.

Dynamic URL Construction and Fetching:

• Refactored NEUROGLASS_DATASOURCE.buildUrl and buildNeuroglassLayerUrl to support async fetching and parsing of directory listings, especially for the neuroglancer-precomputed protocol, including HTML parsing to locate the correct subfolders.
• Added logic to transform instance IDs into the correct path format for URL construction, and included console logging for debugging.

React Component Updates:

• Changed the state management in NeuroglassViewer.jsx to use a new iframeSrc state variable that is updated asynchronously, removing the use of useMemo. [1] [2]
• Removed the unused useMemo import from the React component.

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[Copilot]

Pull request overview

Updates the Virtual Fly Brain frontend’s Neuroglass integration to construct layer URLs against the new file-server datasource (/data/VFB/i/) and to support asynchronous state construction so URLs can be resolved before building the embedded viewer state.

Changes:

• Made buildNeuroglassState / per-instance layer construction async and updated the viewer to build the iframe source in an effect.
• Refactored datasource URL building to support fetch-and-parse of directory listings for neuroglancer-precomputed.
• Added additional console logging for debugging during URL/layer construction.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 8 comments.

File	Description
applications/virtual-fly-brain/frontend/src/utils/neuroglassStateConfig.js	Async URL + layer/state building; adds fetch-based directory parsing to locate Neuroglancer subfolders.
applications/virtual-fly-brain/frontend/src/components/NeuroglassViewer.jsx	Switches from useMemo to useEffect to support async state building and iframe src updates.

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