Function retryTask

packages/react-server/src/ReactFlightServer.js:5617–5748

(request: Request, task: Task)

const emptyRoot = {};

function retryTask(request: Request, task: Task): void {
  if (task.status !== PENDING) {
    // We completed this by other means before we had a chance to retry it.
    return;
  }

  const prevCanEmitDebugInfo = canEmitDebugInfo;
  task.status = RENDERING;

  // We stash the outer parent size so we can restore it when we exit.
  const parentSerializedSize = serializedSize;
  // We don't reset the serialized size counter from reentry because that indicates that we
  // are outlining a model and we actually want to include that size into the parent since
  // it will still block the parent row. It only restores to zero at the top of the stack.
  try {
    // Track the root so we know that we have to emit this object even though it
    // already has an ID. This is needed because we might see this object twice
    // in the same toJSON if it is cyclic.
    modelRoot = task.model;

    if (__DEV__) {
      // Track that we can emit debug info for the current task.
      canEmitDebugInfo = true;
    }

    // We call the destructive form that mutates this task. That way if something
    // suspends again, we can reuse the same task instead of spawning a new one.
    const resolvedModel = renderModelDestructive(
      request,
      task,
      emptyRoot,
      '',
      task.model,
    );

    if (__DEV__) {
      // We're now past rendering this task and future renders will spawn new tasks for their
      // debug info.
      canEmitDebugInfo = false;
    }

    // Track the root again for the resolved object.
    modelRoot = resolvedModel;

    // The keyPath resets at any terminal child node.
    task.keyPath = null;
    task.implicitSlot = false;

    if (__DEV__) {
      const currentEnv = (0, request.environmentName)();
      if (currentEnv !== task.environmentName) {
        request.pendingChunks++;
        // The environment changed since we last emitted any debug information for this
        // task. We emit an entry that just includes the environment name change.
        emitDebugChunk(request, task.id, {env: currentEnv});
      }
    }
    // We've finished rendering. Log the end time.