Only fetch files if the folder has been updated

[oparoz]

Concept

Currently, every time we enter a folder, we ask the server if there has been a change since the last time we retrieved the files, but we can do better and keep the view up to date in real-time.

Specs

• [JS] Connect to live stream
• [PHP] Catch filesystem changes and update stream
• [JS] Invalidate cache if there has been a change

Requirements

• Redis server. Local or remote if your host doesn't offer that service
• Predis. Pure PHP redis client
• Phpiredis (optional for people who need even more speed) and its dependency hiredis

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[oparoz]

Seems hooks are broken on 8.0 and 8.1. Waiting for confirmation and hopefully a quick resolution.

[oparoz]

The official way of using Hooks is documented, but has not been implemented... Still there are ways to use them using other methods.

On its own, I'm not sure this is necessary as it only works after the first request, but the mechanism could be used to pre-load the content of sub-albums

[oparoz]

This issue was moved to nextcloud/gallery#37