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import type { CacheNode } from '../../../shared/lib/app-router-context.shared-runtime'
import type { FlightSegmentPath } from '../../../server/app-render/types'
import { createRouterCacheKey } from './create-router-cache-key'
import { getNextFlightSegmentPath } from '../../flight-data-helpers'
/**
* Fill cache up to the end of the flightSegmentPath, invalidating anything below it.
*/
export function invalidateCacheBelowFlightSegmentPath(
newCache: CacheNode,
existingCache: CacheNode,
flightSegmentPath: FlightSegmentPath
): void {
const isLastEntry = flightSegmentPath.length <= 2
const [parallelRouteKey, segment] = flightSegmentPath
const cacheKey = createRouterCacheKey(segment)
const existingChildSegmentMap =
existingCache.parallelRoutes.get(parallelRouteKey)
if (!existingChildSegmentMap) {
// Bailout because the existing cache does not have the path to the leaf node
// Will trigger lazy fetch in layout-router because of missing segment
return
}
let childSegmentMap = newCache.parallelRoutes.get(parallelRouteKey)
if (!childSegmentMap || childSegmentMap === existingChildSegmentMap) {
childSegmentMap = new Map(existingChildSegmentMap)
newCache.parallelRoutes.set(parallelRouteKey, childSegmentMap)
}
// In case of last entry don't copy further down.
if (isLastEntry) {
childSegmentMap.delete(cacheKey)
return
}
const existingChildCacheNode = existingChildSegmentMap.get(cacheKey)
let childCacheNode = childSegmentMap.get(cacheKey)
if (!childCacheNode || !existingChildCacheNode) {
// Bailout because the existing cache does not have the path to the leaf node
// Will trigger lazy fetch in layout-router because of missing segment
return
}
if (childCacheNode === existingChildCacheNode) {
childCacheNode = {
lazyData: childCacheNode.lazyData,
rsc: childCacheNode.rsc,
prefetchRsc: childCacheNode.prefetchRsc,
head: childCacheNode.head,
prefetchHead: childCacheNode.prefetchHead,
parallelRoutes: new Map(childCacheNode.parallelRoutes),
} as CacheNode
childSegmentMap.set(cacheKey, childCacheNode)
}
invalidateCacheBelowFlightSegmentPath(
childCacheNode,
existingChildCacheNode,
getNextFlightSegmentPath(flightSegmentPath)
)
}
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