Bugfix: Nested useOpaqueIdentifier references (#22553)

* Handle render phase updates explicitly

We fire a warning in development if a component is updated during
the render phase (with the exception of local hook updates, which have
their own defined behavior).

Because it's not a supported React pattern, we don't have that many
tests that trigger this path. But it is meant to have reasonable
semantics when it does happen, so that if it accidentally ships to
production, the app doesn't crash unnecessarily. The behavior is not
super well-defined, though.

There are also some _internal_ React implementation details that
intentionally to rely on this behavior. Most prominently, selective
hydration and useOpaqueIdentifier.

I need to tweak the behavior of render phase updates slightly as part
of a fix for useOpaqueIdentifier. This shouldn't cause a user-facing
change in behavior outside of useOpaqueIdentifier, but it does require
that we explicitly model render phase updates.

* Bugfix: Nested useOpaqueIdentifier calls

Fixes an issue where multiple useOpaqueIdentifier hooks are upgraded
to client ids within the same render.

The way the upgrade works is that useOpaqueIdentifier schedules a
render phase update then throws an error to trigger React's error
recovery mechanism.

The normal error recovery mechanism is designed for errors that occur
as a result of interleaved mutations, so we usually only retry a single
time, synchronously, before giving up.

useOpaqueIdentifier is different because the error its throws when
upgrading is not caused by an interleaved mutation. Rather, it happens
when an ID is referenced for the first time inside a client-rendered
tree (i.e. sommething that wasn't part of the initial server render).
The fact that it relies on the error recovery mechanism is an
implementation detail. And a single recovery attempt may be
insufficient. For example, if a parent and a child component may
reference different ids, and both are mounted as a result of the same
client update, that will trigger two separate error recovery attempts.

Because render phase updates are not allowed when triggered from
userspace — we log a warning in developement to prevent them —
we can assume that if something does update during the render phase, it
is one of our "legit" implementation details like useOpaqueIdentifier.
So we can keep retrying until we succeed — up to a limit, to protect
against inifite loops. I chose 50 since that's the limit we use for
commit phase updates.

Author: acdlite

packages/react-dom/src/__tests__/ReactDOMServerIntegrationHooks-test.js

@@ -1975,5 +1975,40 @@ describe('ReactDOMServerHooks', () => {
         container.getElementsByTagName('span')[0].getAttribute('id'),
       ).not.toBeNull();
     });
+
+    it('useOpaqueIdentifier with multiple ids in nested components', async () => {
+      function DivWithId({id, children}) {
+        return <div id={id}>{children}</div>;
+      }
+
+      let setShowMore;
+      function App() {
+        const outerId = useOpaqueIdentifier();
+        const innerId = useOpaqueIdentifier();
+        const [showMore, _setShowMore] = useState(false);
+        setShowMore = _setShowMore;
+        return showMore ? (
+          <DivWithId id={outerId}>
+            <DivWithId id={innerId} />
+          </DivWithId>
+        ) : null;
+      }
+
+      const container = document.createElement('div');
+      container.innerHTML = ReactDOMServer.renderToString(<App />);
+
+      await act(async () => {
+        ReactDOM.hydrateRoot(container, <App />);
+      });
+
+      // Show additional content that wasn't part of the initial server-
+      // rendered repsonse.
+      await act(async () => {
+        setShowMore(true);
+      });
+      const [div1, div2] = container.getElementsByTagName('div');
+      expect(typeof div1.getAttribute('id')).toBe('string');
+      expect(typeof div2.getAttribute('id')).toBe('string');
+    });
   });
 });

packages/react-reconciler/src/ReactFiberWorkLoop.new.js

@@ -294,7 +294,9 @@ let workInProgressRootIncludedLanes: Lanes = NoLanes;
 // includes unprocessed updates, not work in bailed out children.
 let workInProgressRootSkippedLanes: Lanes = NoLanes;
 // Lanes that were updated (in an interleaved event) during this render.
-let workInProgressRootUpdatedLanes: Lanes = NoLanes;
+let workInProgressRootInterleavedUpdatedLanes: Lanes = NoLanes;
+// Lanes that were updated during the render phase (*not* an interleaved event).
+let workInProgressRootRenderPhaseUpdatedLanes: Lanes = NoLanes;
 // Lanes that were pinged (in an interleaved event) during this render.
 let workInProgressRootPingedLanes: Lanes = NoLanes;
 
@@ -454,86 +456,105 @@ export function scheduleUpdateOnFiber(
   eventTime: number,
 ): FiberRoot | null {
   checkForNestedUpdates();
-  warnAboutRenderPhaseUpdatesInDEV(fiber);
 
   const root = markUpdateLaneFromFiberToRoot(fiber, lane);
   if (root === null) {
     return null;
   }
 
-  if (enableUpdaterTracking) {
-    if (isDevToolsPresent) {
-      addFiberToLanesMap(root, fiber, lane);
-    }
-  }
-
   // Mark that the root has a pending update.
   markRootUpdated(root, lane, eventTime);
 
-  if (enableProfilerTimer && enableProfilerNestedUpdateScheduledHook) {
-    if (
-      (executionContext & CommitContext) !== NoContext &&
-      root === rootCommittingMutationOrLayoutEffects
-    ) {
-      if (fiber.mode & ProfileMode) {
-        let current = fiber;
-        while (current !== null) {
-          if (current.tag === Profiler) {
-            const {id, onNestedUpdateScheduled} = current.memoizedProps;
-            if (typeof onNestedUpdateScheduled === 'function') {
-              onNestedUpdateScheduled(id);
+  if (
+    (executionContext & RenderContext) !== NoLanes &&
+    root === workInProgressRoot
+  ) {
+    // This update was dispatched during the render phase. This is a mistake
+    // if the update originates from user space (with the exception of local
+    // hook updates, which are handled differently and don't reach this
+    // function), but there are some internal React features that use this as
+    // an implementation detail, like selective hydration
+    // and useOpaqueIdentifier.
+    warnAboutRenderPhaseUpdatesInDEV(fiber);
+
+    // Track lanes that were updated during the render phase
+    workInProgressRootRenderPhaseUpdatedLanes = mergeLanes(
+      workInProgressRootRenderPhaseUpdatedLanes,
+      lane,
+    );
+  } else {
+    // This is a normal update, scheduled from outside the render phase. For
+    // example, during an input event.
+    if (enableUpdaterTracking) {
+      if (isDevToolsPresent) {
+        addFiberToLanesMap(root, fiber, lane);
+      }
+    }
+
+    if (enableProfilerTimer && enableProfilerNestedUpdateScheduledHook) {
+      if (
+        (executionContext & CommitContext) !== NoContext &&
+        root === rootCommittingMutationOrLayoutEffects
+      ) {
+        if (fiber.mode & ProfileMode) {
+          let current = fiber;
+          while (current !== null) {
+            if (current.tag === Profiler) {
+              const {id, onNestedUpdateScheduled} = current.memoizedProps;
+              if (typeof onNestedUpdateScheduled === 'function') {
+                onNestedUpdateScheduled(id);
+              }
             }
+            current = current.return;
           }
-          current = current.return;
         }
       }
     }
-  }
 
-  // TODO: Consolidate with `isInterleavedUpdate` check
-  if (root === workInProgressRoot) {
-    // Received an update to a tree that's in the middle of rendering. Mark
-    // that there was an interleaved update work on this root. Unless the
-    // `deferRenderPhaseUpdateToNextBatch` flag is off and this is a render
-    // phase update. In that case, we don't treat render phase updates as if
-    // they were interleaved, for backwards compat reasons.
+    // TODO: Consolidate with `isInterleavedUpdate` check
+    if (root === workInProgressRoot) {
+      // Received an update to a tree that's in the middle of rendering. Mark
+      // that there was an interleaved update work on this root. Unless the
+      // `deferRenderPhaseUpdateToNextBatch` flag is off and this is a render
+      // phase update. In that case, we don't treat render phase updates as if
+      // they were interleaved, for backwards compat reasons.
+      if (
+        deferRenderPhaseUpdateToNextBatch ||
+        (executionContext & RenderContext) === NoContext
+      ) {
+        workInProgressRootInterleavedUpdatedLanes = mergeLanes(
+          workInProgressRootInterleavedUpdatedLanes,
+          lane,
+        );
+      }
+      if (workInProgressRootExitStatus === RootSuspendedWithDelay) {
+        // The root already suspended with a delay, which means this render
+        // definitely won't finish. Since we have a new update, let's mark it as
+        // suspended now, right before marking the incoming update. This has the
+        // effect of interrupting the current render and switching to the update.
+        // TODO: Make sure this doesn't override pings that happen while we've
+        // already started rendering.
+        markRootSuspended(root, workInProgressRootRenderLanes);
+      }
+    }
+
+    ensureRootIsScheduled(root, eventTime);
     if (
-      deferRenderPhaseUpdateToNextBatch ||
-      (executionContext & RenderContext) === NoContext
+      lane === SyncLane &&
+      executionContext === NoContext &&
+      (fiber.mode & ConcurrentMode) === NoMode &&
+      // Treat `act` as if it's inside `batchedUpdates`, even in legacy mode.
+      !(__DEV__ && ReactCurrentActQueue.isBatchingLegacy)
     ) {
-      workInProgressRootUpdatedLanes = mergeLanes(
-        workInProgressRootUpdatedLanes,
-        lane,
-      );
-    }
-    if (workInProgressRootExitStatus === RootSuspendedWithDelay) {
-      // The root already suspended with a delay, which means this render
-      // definitely won't finish. Since we have a new update, let's mark it as
-      // suspended now, right before marking the incoming update. This has the
-      // effect of interrupting the current render and switching to the update.
-      // TODO: Make sure this doesn't override pings that happen while we've
-      // already started rendering.
-      markRootSuspended(root, workInProgressRootRenderLanes);
+      // Flush the synchronous work now, unless we're already working or inside
+      // a batch. This is intentionally inside scheduleUpdateOnFiber instead of
+      // scheduleCallbackForFiber to preserve the ability to schedule a callback
+      // without immediately flushing it. We only do this for user-initiated
+      // updates, to preserve historical behavior of legacy mode.
+      resetRenderTimer();
+      flushSyncCallbacksOnlyInLegacyMode();
     }
   }
-
-  ensureRootIsScheduled(root, eventTime);
-  if (
-    lane === SyncLane &&
-    executionContext === NoContext &&
-    (fiber.mode & ConcurrentMode) === NoMode &&
-    // Treat `act` as if it's inside `batchedUpdates`, even in legacy mode.
-    !(__DEV__ && ReactCurrentActQueue.isBatchingLegacy)
-  ) {
-    // Flush the synchronous work now, unless we're already working or inside
-    // a batch. This is intentionally inside scheduleUpdateOnFiber instead of
-    // scheduleCallbackForFiber to preserve the ability to schedule a callback
-    // without immediately flushing it. We only do this for user-initiated
-    // updates, to preserve historical behavior of legacy mode.
-    resetRenderTimer();
-    flushSyncCallbacksOnlyInLegacyMode();
-  }
-
   return root;
 }
 
@@ -865,7 +886,25 @@ function recoverFromConcurrentError(root, errorRetryLanes) {
     clearContainer(root.containerInfo);
   }
 
-  const exitStatus = renderRootSync(root, errorRetryLanes);
+  let exitStatus;
+
+  const MAX_ERROR_RETRY_ATTEMPTS = 50;
+  for (let i = 0; i < MAX_ERROR_RETRY_ATTEMPTS; i++) {
+    exitStatus = renderRootSync(root, errorRetryLanes);
+    if (
+      exitStatus === RootErrored &&
+      workInProgressRootRenderPhaseUpdatedLanes !== NoLanes
+    ) {
+      // There was a render phase update during this render. This was likely a
+      // useOpaqueIdentifier hook upgrading itself to a client ID. Try rendering
+      // again. This time, the component will use a client ID and will proceed
+      // without throwing. If multiple IDs upgrade as a result of the same
+      // update, we will have to do multiple render passes. To protect against
+      // an inifinite loop, eventually we'll give up.
+      continue;
+    }
+    break;
+  }
 
   executionContext = prevExecutionContext;
 
@@ -1042,7 +1081,10 @@ function markRootSuspended(root, suspendedLanes) {
   // TODO: Lol maybe there's a better way to factor this besides this
   // obnoxiously named function :)
   suspendedLanes = removeLanes(suspendedLanes, workInProgressRootPingedLanes);
-  suspendedLanes = removeLanes(suspendedLanes, workInProgressRootUpdatedLanes);
+  suspendedLanes = removeLanes(
+    suspendedLanes,
+    workInProgressRootInterleavedUpdatedLanes,
+  );
   markRootSuspended_dontCallThisOneDirectly(root, suspendedLanes);
 }
 
@@ -1068,30 +1110,15 @@ function performSyncWorkOnRoot(root) {
 
   let exitStatus = renderRootSync(root, lanes);
   if (root.tag !== LegacyRoot && exitStatus === RootErrored) {
-    const prevExecutionContext = executionContext;
-    executionContext |= RetryAfterError;
-
-    // If an error occurred during hydration,
-    // discard server response and fall back to client side render.
-    if (root.isDehydrated) {
-      root.isDehydrated = false;
-      if (__DEV__) {
-        errorHydratingContainer(root.containerInfo);
-      }
-      clearContainer(root.containerInfo);
-    }
-
     // If something threw an error, try rendering one more time. We'll render
     // synchronously to block concurrent data mutations, and we'll includes
     // all pending updates are included. If it still fails after the second
     // attempt, we'll give up and commit the resulting tree.
     const errorRetryLanes = getLanesToRetrySynchronouslyOnError(root);
     if (errorRetryLanes !== NoLanes) {
       lanes = errorRetryLanes;
-      exitStatus = renderRootSync(root, lanes);
+      exitStatus = recoverFromConcurrentError(root, errorRetryLanes);
     }
-
-    executionContext = prevExecutionContext;
   }
 
   if (exitStatus === RootFatalErrored) {
@@ -1300,7 +1327,8 @@ function prepareFreshStack(root: FiberRoot, lanes: Lanes) {
   workInProgressRootExitStatus = RootIncomplete;
   workInProgressRootFatalError = null;
   workInProgressRootSkippedLanes = NoLanes;
-  workInProgressRootUpdatedLanes = NoLanes;
+  workInProgressRootInterleavedUpdatedLanes = NoLanes;
+  workInProgressRootRenderPhaseUpdatedLanes = NoLanes;
   workInProgressRootPingedLanes = NoLanes;
 
   enqueueInterleavedUpdates();
@@ -1443,7 +1471,7 @@ export function renderDidSuspendDelayIfPossible(): void {
   if (
     workInProgressRoot !== null &&
     (includesNonIdleWork(workInProgressRootSkippedLanes) ||
-      includesNonIdleWork(workInProgressRootUpdatedLanes))
+      includesNonIdleWork(workInProgressRootInterleavedUpdatedLanes))
   ) {
     // Mark the current render as suspended so that we switch to working on
     // the updates that were skipped. Usually we only suspend at the end of
@@ -2697,7 +2725,6 @@ function warnAboutRenderPhaseUpdatesInDEV(fiber) {
   if (__DEV__) {
     if (
       ReactCurrentDebugFiberIsRenderingInDEV &&
-      (executionContext & RenderContext) !== NoContext &&
       !getIsUpdatingOpaqueValueInRenderPhaseInDEV()
     ) {
       switch (fiber.tag) {