next
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The React Framework
56 lines (55 loc) • 3.56 kB
JavaScript
import { extractPathFromFlightRouterState } from '../compute-changed-path';
import { FreshnessPolicy, resetNavigationLockToPending, spawnDynamicRequests, startPPRNavigation } from '../ppr-navigations';
import { completeHardNavigation, completeTraverseNavigation, convertServerPatchToFullTree } from '../../segment-cache/navigation';
import { UnknownDynamicStaleTime } from '../../segment-cache/bfcache';
export function restoreReducer(state, action) {
// This action is used to restore the router state from the history state.
// However, it's possible that the history state no longer contains the `FlightRouterState`.
// We will copy over the internal state on pushState/replaceState events, but if a history entry
// occurred before hydration, or if the user navigated to a hash using a regular anchor link,
// the history state will not contain the `FlightRouterState`.
// In this case, we'll continue to use the existing tree so the router doesn't get into an invalid state.
let treeToRestore;
let renderedSearch;
const historyState = action.historyState;
if (historyState) {
treeToRestore = historyState.tree;
renderedSearch = historyState.renderedSearch;
} else {
treeToRestore = state.tree;
renderedSearch = state.renderedSearch;
}
const currentUrl = new URL(state.canonicalUrl, location.origin);
const restoredUrl = action.url;
const restoredNextUrl = extractPathFromFlightRouterState(treeToRestore) ?? restoredUrl.pathname;
const now = Date.now();
// TODO: Store the dynamic stale time on the top-level state so it's known
// during restores and refreshes.
const accumulation = {
separateRefreshUrls: null,
scrollRef: null
};
const restoreSeed = convertServerPatchToFullTree(now, treeToRestore, null, renderedSearch, UnknownDynamicStaleTime);
const task = startPPRNavigation(now, currentUrl, state.renderedSearch, state.cache, state.tree, restoreSeed.routeTree, restoreSeed.metadataVaryPath, FreshnessPolicy.HistoryTraversal, null, null, restoreSeed.dynamicStaleAt, false, accumulation, // A history-traversal restore never restricts to the shell.
false);
if (task === null) {
return completeHardNavigation(state, restoredUrl, 'replace');
}
spawnDynamicRequests(task, restoredUrl, restoredNextUrl, FreshnessPolicy.HistoryTraversal, accumulation, // History traversal doesn't use route prediction, so there's no route
// cache entry to mark as having a dynamic rewrite on mismatch. If a
// mismatch occurs, the retry handler will traverse the known route tree
// to find and mark the entry.
null, // History traversal always uses 'replace'.
'replace', // Instant Navigation Testing API: a traversal is not a capture. Spawn its
// dynamic requests ungated (null lock) so they render from cache or fetch
// normally rather than being withheld behind the lock.
null, // Not an HMR refresh, so there's no request generation to cancel.
undefined);
// Instant Navigation Testing API: a traversal resets the lock to a fresh
// pending scope — releasing any data withheld by prior forward navigations and
// returning the panel to "awaiting" — without ending the testing session.
// No-op when the testing API is disabled or no lock is held.
resetNavigationLockToPending();
return completeTraverseNavigation(state, restoredUrl, renderedSearch, task.node, task.route, restoredNextUrl);
}
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