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getFilterLimit: handle parameterized replaceable events

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This commit is contained in:
Alex Gleason
2024-07-20 13:55:09 -05:00
committed by fiatjaf_
parent a87099fa5c
commit 9c009ac543
2 changed files with 25 additions and 2 deletions
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17
filter.ts
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@@ -1,5 +1,5 @@
import { Event } from './core.ts'
import { isReplaceableKind } from './kinds.ts'
import { isParameterizedReplaceableKind, isReplaceableKind } from './kinds.ts'
export type Filter = {
ids?: string[]
@@ -72,7 +72,10 @@ export function mergeFilters(...filters: Filter[]): Filter {
return result
}
/** Calculate the intrinsic limit of a filter. This function may return `Infinity`. */
/**
* Calculate the intrinsic limit of a filter.
* This function returns a positive integer, or `Infinity` if there is no intrinsic limit.
*/
export function getFilterLimit(filter: Filter): number {
if (filter.ids && !filter.ids.length) return 0
if (filter.kinds && !filter.kinds.length) return 0
@@ -83,10 +86,20 @@ export function getFilterLimit(filter: Filter): number {
}
return Math.min(
// The `limit` property creates an artificial limit.
Math.max(0, filter.limit ?? Infinity),
// There can only be one event per `id`.
filter.ids?.length ?? Infinity,
// Replaceable events are limited by the number of authors and kinds.
filter.authors?.length && filter.kinds?.every(kind => isReplaceableKind(kind))
? filter.authors.length * filter.kinds.length
: Infinity,
// Parameterized replaceable events are limited by the number of authors, kinds, and "d" tags.
filter.authors?.length && filter.kinds?.every(kind => isParameterizedReplaceableKind(kind)) && filter['#d']?.length
? filter.authors.length * filter.kinds.length * filter['#d'].length
: Infinity,
)
}