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fix: add applesauce caching to extractMetadataFromEvent

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Use getOrComputeCachedValue to cache extracted group metadata on the
event object. This prevents recomputing tag lookups on every access.

Also updated resolveGroupMetadata to use the cached extraction.

Regarding eventStore.replaceable() vs timeline():
- replaceable(kind, pubkey, identifier) requires knowing the author
- For kind 39000, the relay signs the event and we don't know its
  pubkey upfront, so timeline query with #d filter is correct

https://claude.ai/code/session_01CCxAcUsRBkWSL6as1wtFoA
This commit is contained in:
Claude
2026-01-30 13:32:45 +00:00
parent 9c9e5ab37d
commit 824ba552de
1 changed files with 22 additions and 23 deletions
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45
src/lib/chat/group-metadata-helpers.ts
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@@ -1,9 +1,15 @@
import { firstValueFrom } from "rxjs";
import { kinds } from "nostr-tools";
import { profileLoader } from "@/services/loaders";
import { getProfileContent } from "applesauce-core/helpers";
import {
getProfileContent,
getOrComputeCachedValue,
} from "applesauce-core/helpers";
import type { NostrEvent } from "@/types/nostr";
// Symbol for caching extracted group metadata on event objects
const GroupMetadataSymbol = Symbol("groupMetadata");
/**
* Check if a string is a valid nostr pubkey (64 character hex string)
*/
@@ -30,22 +36,25 @@ export function getGroupCacheKey(relayUrl: string, groupId: string): string {
/**
* Extract metadata synchronously from a kind 39000 event
* This is the fast path - no async needed when we have the metadata event
* Uses applesauce caching to avoid recomputing on every access
*/
export function extractMetadataFromEvent(
groupId: string,
metadataEvent: NostrEvent,
): ResolvedGroupMetadata {
const name = metadataEvent.tags.find((t) => t[0] === "name")?.[1] || groupId;
const description = metadataEvent.tags.find((t) => t[0] === "about")?.[1];
const icon = metadataEvent.tags.find((t) => t[0] === "picture")?.[1];
return getOrComputeCachedValue(metadataEvent, GroupMetadataSymbol, () => {
const name =
metadataEvent.tags.find((t) => t[0] === "name")?.[1] || groupId;
const description = metadataEvent.tags.find((t) => t[0] === "about")?.[1];
const icon = metadataEvent.tags.find((t) => t[0] === "picture")?.[1];
return {
name,
description,
icon,
source: "nip29",
};
return {
name,
description,
icon,
source: "nip29" as const,
};
});
}
/**
@@ -66,19 +75,9 @@ export async function resolveGroupMetadata(
relayUrl: string,
metadataEvent?: NostrEvent,
): Promise<ResolvedGroupMetadata> {
// If NIP-29 metadata exists, use it (priority 1)
// If NIP-29 metadata exists, use cached extraction (priority 1)
if (metadataEvent && metadataEvent.kind === 39000) {
const name =
metadataEvent.tags.find((t) => t[0] === "name")?.[1] || groupId;
const description = metadataEvent.tags.find((t) => t[0] === "about")?.[1];
const icon = metadataEvent.tags.find((t) => t[0] === "picture")?.[1];
return {
name,
description,
icon,
source: "nip29",
};
return extractMetadataFromEvent(groupId, metadataEvent);
}
// If no NIP-29 metadata and groupId is a valid pubkey, try profile fallback (priority 2)