gecko-dev/dom/webbrowserpersist/WebBrowserPersistResourcesChild.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebBrowserPersistResourcesChild.h"

#include "WebBrowserPersistDocumentChild.h"

namespace mozilla {

NS_IMPL_ISUPPORTS(WebBrowserPersistResourcesChild,
                  nsIWebBrowserPersistResourceVisitor)

WebBrowserPersistResourcesChild::WebBrowserPersistResourcesChild() {}

WebBrowserPersistResourcesChild::~WebBrowserPersistResourcesChild() = default;

NS_IMETHODIMP
WebBrowserPersistResourcesChild::VisitResource(
    nsIWebBrowserPersistDocument* aDocument, const nsACString& aURI,
    nsContentPolicyType aContentPolicyType) {
  nsCString copiedURI(aURI);  // Yay, XPIDL/IPDL mismatch.
  SendVisitResource(copiedURI, aContentPolicyType);
  return NS_OK;
}

NS_IMETHODIMP
WebBrowserPersistResourcesChild::VisitDocument(
    nsIWebBrowserPersistDocument* aDocument,
    nsIWebBrowserPersistDocument* aSubDocument) {
  auto* subActor = new WebBrowserPersistDocumentChild();
  // As a consequence of how PWebBrowserPersistDocumentConstructor
  // can be sent by both the parent and the child, we must pass the
  // aBrowser and outerWindowID arguments here, but the values are
  // ignored by the parent.  In particular, the BrowserChild in which
  // persistence started does not necessarily exist at this point;
  // see bug 1203602.
  if (!Manager()->Manager()->SendPWebBrowserPersistDocumentConstructor(
          subActor, nullptr, 0)) {
    // NOTE: subActor is freed at this point.
    return NS_ERROR_FAILURE;
  }
  // ...but here, IPC won't free subActor until after this returns
  // to the event loop.

  // The order of these two messages will be preserved, because
  // they're the same toplevel protocol and priority.
  //
  // With this ordering, it's always the transition out of START
  // state that causes a document's parent actor to be exposed to
  // XPCOM (for both parent->child and child->parent construction),
  // which simplifies the lifetime management.
  SendVisitDocument(subActor);
  subActor->Start(aSubDocument);
  return NS_OK;
}

NS_IMETHODIMP
WebBrowserPersistResourcesChild::EndVisit(
    nsIWebBrowserPersistDocument* aDocument, nsresult aStatus) {
  Send__delete__(this, aStatus);
  return NS_OK;
}

}  // namespace mozilla