NIP-28 in Lume

[reyamir]

How Lume handle NIP-28?

Channel List

Lume provide 2 default channels, which are:

lume-general, event_id: "e3cadf5beca1b2af1cddaa41a633679bedf263e3de1eb229c6686c50d85df753"
nostr, event_id: "25e5c82273a271cb1a840d0060391a0bf4965cafeb029d5ab55350b418953fbb"

Event

Lume create 2 Set() objects to store muted user pubkey and hide message event_id

const muted = useRef(new Set());
const hided = useRef(new Set());

Lume fetch event with filter kind: [42, 43 ,44] when user click to channel

[
        {
          authors: [activeAccount.pubkey],
          kinds: [43, 44],
          since: dateToUnix(hoursAgo(24, now.current)),
        },
        {
          '#e': [params.id],
          kinds: [42],
          since: dateToUnix(hoursAgo(24, now.current)),
        },
]

Kind 43

If event received is kind 43, store event_id in hided

hided.current = hided.current.add(event.tags[0][1]);

Kind 44

If event received is kind 44, store pubkey in muted

muted.current = muted.current.add(event.tags[0][1]);

Kind 42

If event received is kind 42, and if it's event_id or pubkey don't present in muted and hided then store it in atom channelMessages. After that, ChannelMessages component get message from atom sortedChannelMessages which is sorted message base on created_at

if (muted.current.has(event.pubkey)) {
  console.log('muted');
} else if (hided.current.has(event.id)) {
  console.log('hided');
} else {
  setChannelMessages((messages) => [event, ...messages]);
}

Kind 41

In useChannelMetadata hook, Lume will load metadata from kind 40 first, if kind 41 present for this event_id then update and re-render

Known problems

• Currently, Lume is only load event since 24 hours, many channel have spam issue, if load all events from begining, it will hurt performance
• Create channel is work fine, but it need to improve UI/UX

Roadmap

• Implement infinite loading, when user scroll up, load more event instead load all event at once
• Build discover page for channels