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import type { CacheHandlerValue } from '.'
import { CachedRouteKind } from '../../response-cache/types'
import { LRUCache } from '../lru-cache'
let memoryCache: LRUCache<CacheHandlerValue> | undefined
export function getMemoryCache(maxMemoryCacheSize: number) {
if (!memoryCache) {
memoryCache = new LRUCache(maxMemoryCacheSize, function length({ value }) {
if (!value) {
return 25
} else if (value.kind === CachedRouteKind.REDIRECT) {
return JSON.stringify(value.props).length
} else if (value.kind === CachedRouteKind.IMAGE) {
throw new Error('invariant image should not be incremental-cache')
} else if (value.kind === CachedRouteKind.FETCH) {
return JSON.stringify(value.data || '').length
} else if (value.kind === CachedRouteKind.APP_ROUTE) {
return value.body.length
}
// rough estimate of size of cache value
return (
value.html.length +
(JSON.stringify(
value.kind === CachedRouteKind.APP_PAGE
? value.rscData
: value.pageData
)?.length || 0)
)
})
}
return memoryCache
}
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