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filter: use getFilterLimit from nostr-tools

This commit is contained in:
Alex Gleason 2024-05-03 13:26:26 -05:00
parent 091392088f
commit 6b20104327
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1 changed files with 1 additions and 18 deletions
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19
src/filter.ts
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@ -1,9 +1,8 @@
import { NostrEvent, NostrFilter, NSchema as n } from '@nostrify/nostrify';
import stringifyStable from 'fast-stable-stringify';
import { getFilterLimit } from 'nostr-tools';
import { z } from 'zod';
import { isReplaceableKind } from '@/kinds.ts';
/** Microfilter to get one specific event by ID. */
type IdMicrofilter = { ids: [NostrEvent['id']] };
/** Microfilter to get an author. */
@ -50,22 +49,6 @@ function isMicrofilter(filter: NostrFilter): filter is MicroFilter {
return microFilterSchema.safeParse(filter).success;
}
/** Calculate the intrinsic limit of a filter. */
function getFilterLimit(filter: NostrFilter): number {
if (filter.ids && !filter.ids.length) return 0;
if (filter.kinds && !filter.kinds.length) return 0;
if (filter.authors && !filter.authors.length) return 0;
return Math.min(
Math.max(0, filter.limit ?? Infinity),
filter.ids?.length ?? Infinity,
filter.authors?.length &&
filter.kinds?.every((kind) => isReplaceableKind(kind))
? filter.authors.length * filter.kinds.length
: Infinity,
);
}
/** Returns true if the filter could potentially return any stored events at all. */
function canFilter(filter: NostrFilter): boolean {
return getFilterLimit(filter) > 0;