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import type { CacheNode } from '../../../shared/lib/app-router-context.shared-runtime'
import type { Segment } from '../../../server/app-render/types'
import { invalidateCacheByRouterState } from './invalidate-cache-by-router-state'
import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head'
import { createRouterCacheKey } from './create-router-cache-key'
import type { PrefetchCacheEntry } from './router-reducer-types'
import { PAGE_SEGMENT_KEY } from '../../../shared/lib/segment'
import type { NormalizedFlightData } from '../../flight-data-helpers'
/**
* Common logic for filling cache with new sub tree data.
*/
function fillCacheHelper(
navigatedAt: number,
newCache: CacheNode,
existingCache: CacheNode,
flightData: NormalizedFlightData,
prefetchEntry: PrefetchCacheEntry | undefined,
fillLazyItems: boolean
): void {
const {
segmentPath,
seedData: cacheNodeSeedData,
tree: treePatch,
head,
} = flightData
let newCacheNode = newCache
let existingCacheNode = existingCache
for (let i = 0; i < segmentPath.length; i += 2) {
const parallelRouteKey: string = segmentPath[i]
const segment: Segment = segmentPath[i + 1]
// segmentPath is a repeating tuple of parallelRouteKey and segment
// we know we've hit the last entry we've reached our final pair
const isLastEntry = i === segmentPath.length - 2
const cacheKey = createRouterCacheKey(segment)
const existingChildSegmentMap =
existingCacheNode.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
continue
}
let childSegmentMap = newCacheNode.parallelRoutes.get(parallelRouteKey)
if (!childSegmentMap || childSegmentMap === existingChildSegmentMap) {
childSegmentMap = new Map(existingChildSegmentMap)
newCacheNode.parallelRoutes.set(parallelRouteKey, childSegmentMap)
}
const existingChildCacheNode = existingChildSegmentMap.get(cacheKey)
let childCacheNode = childSegmentMap.get(cacheKey)
if (isLastEntry) {
if (
cacheNodeSeedData &&
(!childCacheNode ||
!childCacheNode.lazyData ||
childCacheNode === existingChildCacheNode)
) {
const incomingSegment = cacheNodeSeedData[0]
const rsc = cacheNodeSeedData[1]
const loading = cacheNodeSeedData[3]
childCacheNode = {
lazyData: null,
// When `fillLazyItems` is false, we only want to fill the RSC data for the layout,
// not the page segment.
rsc:
fillLazyItems || incomingSegment !== PAGE_SEGMENT_KEY ? rsc : null,
prefetchRsc: null,
head: null,
prefetchHead: null,
loading,
parallelRoutes:
fillLazyItems && existingChildCacheNode
? new Map(existingChildCacheNode.parallelRoutes)
: new Map(),
navigatedAt,
}
if (existingChildCacheNode && fillLazyItems) {
invalidateCacheByRouterState(
childCacheNode,
existingChildCacheNode,
treePatch
)
}
if (fillLazyItems) {
fillLazyItemsTillLeafWithHead(
navigatedAt,
childCacheNode,
existingChildCacheNode,
treePatch,
cacheNodeSeedData,
head,
prefetchEntry
)
}
childSegmentMap.set(cacheKey, childCacheNode)
}
continue
}
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
continue
}
if (childCacheNode === existingChildCacheNode) {
childCacheNode = {
lazyData: childCacheNode.lazyData,
rsc: childCacheNode.rsc,
prefetchRsc: childCacheNode.prefetchRsc,
head: childCacheNode.head,
prefetchHead: childCacheNode.prefetchHead,
parallelRoutes: new Map(childCacheNode.parallelRoutes),
loading: childCacheNode.loading,
} as CacheNode
childSegmentMap.set(cacheKey, childCacheNode)
}
// Move deeper into the cache nodes
newCacheNode = childCacheNode
existingCacheNode = existingChildCacheNode
}
}
/**
* Fill cache with rsc based on flightDataPath
*/
export function fillCacheWithNewSubTreeData(
navigatedAt: number,
newCache: CacheNode,
existingCache: CacheNode,
flightData: NormalizedFlightData,
prefetchEntry?: PrefetchCacheEntry
): void {
fillCacheHelper(
navigatedAt,
newCache,
existingCache,
flightData,
prefetchEntry,
true
)
}
export function fillCacheWithNewSubTreeDataButOnlyLoading(
navigatedAt: number,
newCache: CacheNode,
existingCache: CacheNode,
flightData: NormalizedFlightData,
prefetchEntry?: PrefetchCacheEntry
): void {
fillCacheHelper(
navigatedAt,
newCache,
existingCache,
flightData,
prefetchEntry,
false
)
}
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