Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1458 insertions, 0 deletions

diff --git a/dom/serviceworkers/ServiceWorkerRegistrar.cpp b/dom/serviceworkers/ServiceWorkerRegistrar.cpp
new file mode 100644
index 0000000000..cc2b490c5c
--- /dev/null
+++ b/dom/serviceworkers/ServiceWorkerRegistrar.cpp
@@ -0,0 +1,1458 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "ServiceWorkerRegistrar.h"
+#include "ServiceWorkerManager.h"
+#include "mozilla/dom/ServiceWorkerRegistrarTypes.h"
+#include "mozilla/dom/DOMException.h"
+#include "mozilla/net/MozURL.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+#include "nsIEventTarget.h"
+#include "nsIInputStream.h"
+#include "nsILineInputStream.h"
+#include "nsIObserverService.h"
+#include "nsIOutputStream.h"
+#include "nsISafeOutputStream.h"
+#include "nsIServiceWorkerManager.h"
+#include "nsIWritablePropertyBag2.h"
+
+#include "MainThreadUtils.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/dom/StorageActivityService.h"
+#include "mozilla/ErrorNames.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/ModuleUtils.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "ServiceWorkerUtils.h"
+
+using namespace mozilla::ipc;
+
+extern mozilla::LazyLogModule sWorkerTelemetryLog;
+
+#ifdef LOG
+#  undef LOG
+#endif
+#define LOG(_args) MOZ_LOG(sWorkerTelemetryLog, LogLevel::Debug, _args);
+
+namespace mozilla::dom {
+
+namespace {
+
+static const char* gSupportedRegistrarVersions[] = {
+    SERVICEWORKERREGISTRAR_VERSION, "8", "7", "6", "5", "4", "3", "2"};
+
+static const uint32_t kInvalidGeneration = static_cast<uint32_t>(-1);
+
+StaticRefPtr<ServiceWorkerRegistrar> gServiceWorkerRegistrar;
+
+nsresult GetOriginAndBaseDomain(const nsACString& aURL, nsACString& aOrigin,
+                                nsACString& aBaseDomain) {
+  RefPtr<net::MozURL> url;
+  nsresult rv = net::MozURL::Init(getter_AddRefs(url), aURL);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  url->Origin(aOrigin);
+
+  rv = url->BaseDomain(aBaseDomain);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult ReadLine(nsILineInputStream* aStream, nsACString& aValue) {
+  bool hasMoreLines;
+  nsresult rv = aStream->ReadLine(aValue, &hasMoreLines);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (NS_WARN_IF(!hasMoreLines)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+nsresult CreatePrincipalInfo(nsILineInputStream* aStream,
+                             ServiceWorkerRegistrationData* aEntry,
+                             bool aSkipSpec = false) {
+  nsAutoCString suffix;
+  nsresult rv = ReadLine(aStream, suffix);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  OriginAttributes attrs;
+  if (!attrs.PopulateFromSuffix(suffix)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (aSkipSpec) {
+    nsAutoCString unused;
+    nsresult rv = ReadLine(aStream, unused);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  rv = ReadLine(aStream, aEntry->scope());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCString origin;
+  nsCString baseDomain;
+  rv = GetOriginAndBaseDomain(aEntry->scope(), origin, baseDomain);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  aEntry->principal() = mozilla::ipc::ContentPrincipalInfo(
+      attrs, origin, aEntry->scope(), Nothing(), baseDomain);
+
+  return NS_OK;
+}
+
+const IPCNavigationPreloadState gDefaultNavigationPreloadState(false,
+                                                               "true"_ns);
+
+}  // namespace
+
+NS_IMPL_ISUPPORTS(ServiceWorkerRegistrar, nsIObserver, nsIAsyncShutdownBlocker)
+
+void ServiceWorkerRegistrar::Initialize() {
+  MOZ_ASSERT(!gServiceWorkerRegistrar);
+
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  gServiceWorkerRegistrar = new ServiceWorkerRegistrar();
+  ClearOnShutdown(&gServiceWorkerRegistrar);
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    DebugOnly<nsresult> rv = obs->AddObserver(gServiceWorkerRegistrar,
+                                              "profile-after-change", false);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+}
+
+/* static */
+already_AddRefed<ServiceWorkerRegistrar> ServiceWorkerRegistrar::Get() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  MOZ_ASSERT(gServiceWorkerRegistrar);
+  RefPtr<ServiceWorkerRegistrar> service = gServiceWorkerRegistrar.get();
+  return service.forget();
+}
+
+ServiceWorkerRegistrar::ServiceWorkerRegistrar()
+    : mMonitor("ServiceWorkerRegistrar.mMonitor"),
+      mDataLoaded(false),
+      mDataGeneration(kInvalidGeneration),
+      mFileGeneration(kInvalidGeneration),
+      mRetryCount(0),
+      mShuttingDown(false),
+      mSaveDataRunnableDispatched(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+ServiceWorkerRegistrar::~ServiceWorkerRegistrar() {
+  MOZ_ASSERT(!mSaveDataRunnableDispatched);
+}
+
+void ServiceWorkerRegistrar::GetRegistrations(
+    nsTArray<ServiceWorkerRegistrationData>& aValues) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aValues.IsEmpty());
+
+  MonitorAutoLock lock(mMonitor);
+
+  // If we don't have the profile directory, profile is not started yet (and
+  // probably we are in a utest).
+  if (!mProfileDir) {
+    return;
+  }
+
+  // We care just about the first execution because this can be blocked by
+  // loading data from disk.
+  static bool firstTime = true;
+  TimeStamp startTime;
+
+  if (firstTime) {
+    startTime = TimeStamp::NowLoRes();
+  }
+
+  // Waiting for data loaded.
+  mMonitor.AssertCurrentThreadOwns();
+  while (!mDataLoaded) {
+    mMonitor.Wait();
+  }
+
+  aValues.AppendElements(mData);
+
+  MaybeResetGeneration();
+  MOZ_DIAGNOSTIC_ASSERT(mDataGeneration != kInvalidGeneration);
+  MOZ_DIAGNOSTIC_ASSERT(mFileGeneration != kInvalidGeneration);
+
+  if (firstTime) {
+    firstTime = false;
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::SERVICE_WORKER_REGISTRATION_LOADING, startTime);
+  }
+}
+
+namespace {
+
+bool Equivalent(const ServiceWorkerRegistrationData& aLeft,
+                const ServiceWorkerRegistrationData& aRight) {
+  MOZ_ASSERT(aLeft.principal().type() ==
+             mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+  MOZ_ASSERT(aRight.principal().type() ==
+             mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+
+  const auto& leftPrincipal = aLeft.principal().get_ContentPrincipalInfo();
+  const auto& rightPrincipal = aRight.principal().get_ContentPrincipalInfo();
+
+  // Only compare the attributes, not the spec part of the principal.
+  // The scope comparison above already covers the origin and codebase
+  // principals include the full path in their spec which is not what
+  // we want here.
+  return aLeft.scope() == aRight.scope() &&
+         leftPrincipal.attrs() == rightPrincipal.attrs();
+}
+
+}  // anonymous namespace
+
+void ServiceWorkerRegistrar::RegisterServiceWorker(
+    const ServiceWorkerRegistrationData& aData) {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to register a serviceWorker during shutting down.");
+    return;
+  }
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+    RegisterServiceWorkerInternal(aData);
+  }
+
+  MaybeScheduleSaveData();
+  StorageActivityService::SendActivity(aData.principal());
+}
+
+void ServiceWorkerRegistrar::UnregisterServiceWorker(
+    const PrincipalInfo& aPrincipalInfo, const nsACString& aScope) {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to unregister a serviceWorker during shutting down.");
+    return;
+  }
+
+  bool deleted = false;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+
+    ServiceWorkerRegistrationData tmp;
+    tmp.principal() = aPrincipalInfo;
+    tmp.scope() = aScope;
+
+    for (uint32_t i = 0; i < mData.Length(); ++i) {
+      if (Equivalent(tmp, mData[i])) {
+        gServiceWorkersRegistered--;
+        if (mData[i].currentWorkerHandlesFetch()) {
+          gServiceWorkersRegisteredFetch--;
+        }
+        // Update Telemetry
+        Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                             u"All"_ns, gServiceWorkersRegistered);
+        Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                             u"Fetch"_ns, gServiceWorkersRegisteredFetch);
+        LOG(("Unregister ServiceWorker: %u, fetch %u\n",
+             gServiceWorkersRegistered, gServiceWorkersRegisteredFetch));
+
+        mData.RemoveElementAt(i);
+        mDataGeneration = GetNextGeneration();
+        deleted = true;
+        break;
+      }
+    }
+  }
+
+  if (deleted) {
+    MaybeScheduleSaveData();
+    StorageActivityService::SendActivity(aPrincipalInfo);
+  }
+}
+
+void ServiceWorkerRegistrar::RemoveAll() {
+  AssertIsOnBackgroundThread();
+
+  if (mShuttingDown) {
+    NS_WARNING("Failed to remove all the serviceWorkers during shutting down.");
+    return;
+  }
+
+  bool deleted = false;
+
+  nsTArray<ServiceWorkerRegistrationData> data;
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(mDataLoaded);
+
+    // Let's take a copy in order to inform StorageActivityService.
+    data = mData.Clone();
+
+    deleted = !mData.IsEmpty();
+    mData.Clear();
+
+    mDataGeneration = GetNextGeneration();
+  }
+
+  if (!deleted) {
+    return;
+  }
+
+  MaybeScheduleSaveData();
+
+  for (uint32_t i = 0, len = data.Length(); i < len; ++i) {
+    StorageActivityService::SendActivity(data[i].principal());
+  }
+}
+
+void ServiceWorkerRegistrar::LoadData() {
+  MOZ_ASSERT(!NS_IsMainThread());
+#ifdef DEBUG
+  {
+    MonitorAutoLock lock(mMonitor);
+    MOZ_ASSERT(!mDataLoaded);
+  }
+#endif
+
+  nsresult rv = ReadData();
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    DeleteData();
+    // Also if the reading failed we have to notify what is waiting for data.
+  }
+
+  MonitorAutoLock lock(mMonitor);
+  MOZ_ASSERT(!mDataLoaded);
+  mDataLoaded = true;
+  mMonitor.Notify();
+}
+
+bool ServiceWorkerRegistrar::ReloadDataForTest() {
+  if (NS_WARN_IF(!StaticPrefs::dom_serviceWorkers_testing_enabled())) {
+    return false;
+  }
+
+  MOZ_ASSERT(NS_IsMainThread());
+  MonitorAutoLock lock(mMonitor);
+  mData.Clear();
+  mDataLoaded = false;
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  nsCOMPtr<nsIRunnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::LoadData", this,
+                        &ServiceWorkerRegistrar::LoadData);
+  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch the LoadDataRunnable.");
+    return false;
+  }
+
+  mMonitor.AssertCurrentThreadOwns();
+  while (!mDataLoaded) {
+    mMonitor.Wait();
+  }
+
+  return mDataLoaded;
+}
+
+nsresult ServiceWorkerRegistrar::ReadData() {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+
+    if (!mProfileDir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  bool exists;
+  rv = file->Exists(&exists);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (!exists) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIInputStream> stream;
+  rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsILineInputStream> lineInputStream = do_QueryInterface(stream);
+  MOZ_ASSERT(lineInputStream);
+
+  nsAutoCString version;
+  bool hasMoreLines;
+  rv = lineInputStream->ReadLine(version, &hasMoreLines);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (!IsSupportedVersion(version)) {
+    nsContentUtils::LogMessageToConsole(
+        nsPrintfCString("Unsupported service worker registrar version: %s",
+                        version.get())
+            .get());
+    return NS_ERROR_FAILURE;
+  }
+
+  nsTArray<ServiceWorkerRegistrationData> tmpData;
+
+  bool overwrite = false;
+  bool dedupe = false;
+  while (hasMoreLines) {
+    ServiceWorkerRegistrationData* entry = tmpData.AppendElement();
+
+#define GET_LINE(x)                                 \
+  rv = lineInputStream->ReadLine(x, &hasMoreLines); \
+  if (NS_WARN_IF(NS_FAILED(rv))) {                  \
+    return rv;                                      \
+  }                                                 \
+  if (NS_WARN_IF(!hasMoreLines)) {                  \
+    return NS_ERROR_FAILURE;                        \
+  }
+
+    nsAutoCString line;
+    if (version.EqualsLiteral(SERVICEWORKERREGISTRAR_VERSION)) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString updateViaCache;
+      GET_LINE(updateViaCache);
+      entry->updateViaCache() = updateViaCache.ToInteger(&rv, 16);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      if (entry->updateViaCache() >
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE) {
+        return NS_ERROR_INVALID_ARG;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      nsAutoCString navigationPreloadEnabledStr;
+      GET_LINE(navigationPreloadEnabledStr);
+      bool navigationPreloadEnabled =
+          navigationPreloadEnabledStr.ToInteger(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->navigationPreloadState().enabled() = navigationPreloadEnabled;
+
+      GET_LINE(entry->navigationPreloadState().headerValue());
+    } else if (version.EqualsLiteral("8")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString updateViaCache;
+      GET_LINE(updateViaCache);
+      entry->updateViaCache() = updateViaCache.ToInteger(&rv, 16);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      if (entry->updateViaCache() >
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE) {
+        return NS_ERROR_INVALID_ARG;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("7")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString loadFlags;
+      GET_LINE(loadFlags);
+      entry->updateViaCache() =
+          loadFlags.ToInteger(&rv, 16) == nsIRequest::LOAD_NORMAL
+              ? nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL
+              : nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      nsAutoCString installedTimeStr;
+      GET_LINE(installedTimeStr);
+      int64_t installedTime = installedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerInstalledTime() = installedTime;
+
+      nsAutoCString activatedTimeStr;
+      GET_LINE(activatedTimeStr);
+      int64_t activatedTime = activatedTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->currentWorkerActivatedTime() = activatedTime;
+
+      nsAutoCString lastUpdateTimeStr;
+      GET_LINE(lastUpdateTimeStr);
+      int64_t lastUpdateTime = lastUpdateTimeStr.ToInteger64(&rv);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      entry->lastUpdateTime() = lastUpdateTime;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("6")) {
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      nsAutoCString loadFlags;
+      GET_LINE(loadFlags);
+      entry->updateViaCache() =
+          loadFlags.ToInteger(&rv, 16) == nsIRequest::LOAD_NORMAL
+              ? nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL
+              : nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("5")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      nsAutoCString fetchFlag;
+      GET_LINE(fetchFlag);
+      if (!fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE) &&
+          !fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_FALSE)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      entry->currentWorkerHandlesFetch() =
+          fetchFlag.EqualsLiteral(SERVICEWORKERREGISTRAR_TRUE);
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("4")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("3")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry, true);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else if (version.EqualsLiteral("2")) {
+      overwrite = true;
+      dedupe = true;
+
+      rv = CreatePrincipalInfo(lineInputStream, entry, true);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+
+      // scriptSpec is no more used in latest version.
+      nsAutoCString unused;
+      GET_LINE(unused);
+
+      GET_LINE(entry->currentWorkerURL());
+
+      // default handlesFetch flag to Enabled
+      entry->currentWorkerHandlesFetch() = true;
+
+      nsAutoCString cacheName;
+      GET_LINE(cacheName);
+      CopyUTF8toUTF16(cacheName, entry->cacheName());
+
+      // waitingCacheName is no more used in latest version.
+      GET_LINE(unused);
+
+      entry->updateViaCache() =
+          nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS;
+
+      entry->currentWorkerInstalledTime() = 0;
+      entry->currentWorkerActivatedTime() = 0;
+      entry->lastUpdateTime() = 0;
+
+      entry->navigationPreloadState() = gDefaultNavigationPreloadState;
+    } else {
+      MOZ_ASSERT_UNREACHABLE("Should never get here!");
+    }
+
+#undef GET_LINE
+
+    rv = lineInputStream->ReadLine(line, &hasMoreLines);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    if (!line.EqualsLiteral(SERVICEWORKERREGISTRAR_TERMINATOR)) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  stream->Close();
+
+  // We currently only call this at startup where we block the main thread
+  // preventing further operation until it completes, however take the lock
+  // in case that changes
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    // Copy data over to mData.
+    for (uint32_t i = 0; i < tmpData.Length(); ++i) {
+      // Older versions could sometimes write out empty, useless entries.
+      // Prune those here.
+      if (!ServiceWorkerRegistrationDataIsValid(tmpData[i])) {
+        continue;
+      }
+
+      bool match = false;
+      if (dedupe) {
+        MOZ_ASSERT(overwrite);
+        // If this is an old profile, then we might need to deduplicate.  In
+        // theory this can be removed in the future (Bug 1248449)
+        for (uint32_t j = 0; j < mData.Length(); ++j) {
+          // Use same comparison as RegisterServiceWorker. Scope contains
+          // basic origin information.  Combine with any principal attributes.
+          if (Equivalent(tmpData[i], mData[j])) {
+            // Last match wins, just like legacy loading used to do in
+            // the ServiceWorkerManager.
+            mData[j] = tmpData[i];
+            // Dupe found, so overwrite file with reduced list.
+            match = true;
+            break;
+          }
+        }
+      } else {
+#ifdef DEBUG
+        // Otherwise assert no duplications in debug builds.
+        for (uint32_t j = 0; j < mData.Length(); ++j) {
+          MOZ_ASSERT(!Equivalent(tmpData[i], mData[j]));
+        }
+#endif
+      }
+      if (!match) {
+        mData.AppendElement(tmpData[i]);
+      }
+    }
+  }
+  // Overwrite previous version.
+  // Cannot call SaveData directly because gtest uses main-thread.
+
+  // XXX NOTE: if we could be accessed multi-threaded here, we would need to
+  // find a way to lock around access to mData.  Since we can't, suppress the
+  // thread-safety warnings.
+  MOZ_PUSH_IGNORE_THREAD_SAFETY
+  if (overwrite && NS_FAILED(WriteData(mData))) {
+    NS_WARNING("Failed to write data for the ServiceWorker Registations.");
+    DeleteData();
+  }
+  MOZ_POP_THREAD_SAFETY
+
+  return NS_OK;
+}
+
+void ServiceWorkerRegistrar::DeleteData() {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    mData.Clear();
+
+    if (!mProfileDir) {
+      return;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  rv = file->Remove(false);
+  if (rv == NS_ERROR_FILE_NOT_FOUND) {
+    return;
+  }
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+}
+
+void ServiceWorkerRegistrar::RegisterServiceWorkerInternal(
+    const ServiceWorkerRegistrationData& aData) {
+  bool found = false;
+  for (uint32_t i = 0, len = mData.Length(); i < len; ++i) {
+    if (Equivalent(aData, mData[i])) {
+      found = true;
+      if (mData[i].currentWorkerHandlesFetch()) {
+        // Decrement here if we found it, in case the new registration no
+        // longer handles Fetch.  If it continues to handle fetch, we'll
+        // bump it back later.
+        gServiceWorkersRegisteredFetch--;
+      }
+      mData[i] = aData;
+      break;
+    }
+  }
+
+  if (!found) {
+    MOZ_ASSERT(ServiceWorkerRegistrationDataIsValid(aData));
+    mData.AppendElement(aData);
+    // We didn't find an entry to update, so we have 1 more
+    gServiceWorkersRegistered++;
+  }
+  // Handles bumping both for new registrations and updates
+  if (aData.currentWorkerHandlesFetch()) {
+    gServiceWorkersRegisteredFetch++;
+  }
+  // Update Telemetry
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"All"_ns, gServiceWorkersRegistered);
+  Telemetry::ScalarSet(Telemetry::ScalarID::SERVICEWORKER_REGISTRATIONS,
+                       u"Fetch"_ns, gServiceWorkersRegisteredFetch);
+  LOG(("Register: %u, fetch %u\n", gServiceWorkersRegistered,
+       gServiceWorkersRegisteredFetch));
+
+  mDataGeneration = GetNextGeneration();
+}
+
+class ServiceWorkerRegistrarSaveDataRunnable final : public Runnable {
+  nsCOMPtr<nsIEventTarget> mEventTarget;
+  const nsTArray<ServiceWorkerRegistrationData> mData;
+  const uint32_t mGeneration;
+
+ public:
+  ServiceWorkerRegistrarSaveDataRunnable(
+      nsTArray<ServiceWorkerRegistrationData>&& aData, uint32_t aGeneration)
+      : Runnable("dom::ServiceWorkerRegistrarSaveDataRunnable"),
+        mEventTarget(GetCurrentEventTarget()),
+        mData(std::move(aData)),
+        mGeneration(aGeneration) {
+    AssertIsOnBackgroundThread();
+    MOZ_DIAGNOSTIC_ASSERT(mGeneration != kInvalidGeneration);
+  }
+
+  NS_IMETHOD
+  Run() override {
+    RefPtr<ServiceWorkerRegistrar> service = ServiceWorkerRegistrar::Get();
+    MOZ_ASSERT(service);
+
+    uint32_t fileGeneration = kInvalidGeneration;
+
+    if (NS_SUCCEEDED(service->SaveData(mData))) {
+      fileGeneration = mGeneration;
+    }
+
+    RefPtr<Runnable> runnable = NewRunnableMethod<uint32_t>(
+        "ServiceWorkerRegistrar::DataSaved", service,
+        &ServiceWorkerRegistrar::DataSaved, fileGeneration);
+    MOZ_ALWAYS_SUCCEEDS(
+        mEventTarget->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL));
+
+    return NS_OK;
+  }
+};
+
+void ServiceWorkerRegistrar::MaybeScheduleSaveData() {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!mShuttingDown);
+
+  if (mShuttingDown || mSaveDataRunnableDispatched ||
+      mDataGeneration <= mFileGeneration) {
+    return;
+  }
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  uint32_t generation = kInvalidGeneration;
+  nsTArray<ServiceWorkerRegistrationData> data;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+    generation = mDataGeneration;
+    data.AppendElements(mData);
+  }
+
+  RefPtr<Runnable> runnable =
+      new ServiceWorkerRegistrarSaveDataRunnable(std::move(data), generation);
+  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  mSaveDataRunnableDispatched = true;
+}
+
+void ServiceWorkerRegistrar::ShutdownCompleted() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  DebugOnly<nsresult> rv = GetShutdownPhase()->RemoveBlocker(this);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+nsresult ServiceWorkerRegistrar::SaveData(
+    const nsTArray<ServiceWorkerRegistrationData>& aData) {
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  nsresult rv = WriteData(aData);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to write data for the ServiceWorker Registations.");
+    // Don't touch the file or in-memory state.  Writing files can
+    // sometimes fail due to virus scanning, etc.  We should just leave
+    // things as is so the next save operation can pick up any changes
+    // without losing data.
+  }
+  return rv;
+}
+
+void ServiceWorkerRegistrar::DataSaved(uint32_t aFileGeneration) {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(mSaveDataRunnableDispatched);
+
+  mSaveDataRunnableDispatched = false;
+
+  // Check for shutdown before possibly triggering any more saves
+  // runnables.
+  MaybeScheduleShutdownCompleted();
+  if (mShuttingDown) {
+    return;
+  }
+
+  // If we got a valid generation, then the save was successful.
+  if (aFileGeneration != kInvalidGeneration) {
+    // Update the file generation.  We also check to see if we
+    // can reset the generation back to zero if the file and data
+    // are now in sync.  This allows us to avoid dealing with wrap
+    // around of the generation count.
+    mFileGeneration = aFileGeneration;
+    MaybeResetGeneration();
+
+    // Successful write resets the retry count.
+    mRetryCount = 0;
+
+    // Possibly schedule another save operation if more data
+    // has come in while processing this one.
+    MaybeScheduleSaveData();
+
+    return;
+  }
+
+  // Otherwise, the save failed since the generation is invalid.  We
+  // want to retry the save, but only a limited number of times.
+  static const uint32_t kMaxRetryCount = 2;
+  if (mRetryCount >= kMaxRetryCount) {
+    return;
+  }
+
+  mRetryCount += 1;
+  MaybeScheduleSaveData();
+}
+
+void ServiceWorkerRegistrar::MaybeScheduleShutdownCompleted() {
+  AssertIsOnBackgroundThread();
+
+  if (mSaveDataRunnableDispatched || !mShuttingDown) {
+    return;
+  }
+
+  RefPtr<Runnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::ShutdownCompleted", this,
+                        &ServiceWorkerRegistrar::ShutdownCompleted);
+  MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(runnable.forget()));
+}
+
+uint32_t ServiceWorkerRegistrar::GetNextGeneration() {
+  uint32_t ret = mDataGeneration + 1;
+  if (ret == kInvalidGeneration) {
+    ret += 1;
+  }
+  return ret;
+}
+
+void ServiceWorkerRegistrar::MaybeResetGeneration() {
+  if (mDataGeneration != mFileGeneration) {
+    return;
+  }
+  mDataGeneration = mFileGeneration = 0;
+}
+
+bool ServiceWorkerRegistrar::IsSupportedVersion(
+    const nsACString& aVersion) const {
+  uint32_t numVersions = ArrayLength(gSupportedRegistrarVersions);
+  for (uint32_t i = 0; i < numVersions; i++) {
+    if (aVersion.EqualsASCII(gSupportedRegistrarVersions[i])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+nsresult ServiceWorkerRegistrar::WriteData(
+    const nsTArray<ServiceWorkerRegistrationData>& aData) {
+  // We cannot assert about the correct thread because normally this method
+  // runs on a IO thread, but in gTests we call it from the main-thread.
+
+  nsCOMPtr<nsIFile> file;
+
+  {
+    MonitorAutoLock lock(mMonitor);
+
+    if (!mProfileDir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  nsresult rv = file->Append(nsLiteralString(SERVICEWORKERREGISTRAR_FILE));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIOutputStream> stream;
+  rv = NS_NewSafeLocalFileOutputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString buffer;
+  buffer.AppendLiteral(SERVICEWORKERREGISTRAR_VERSION);
+  buffer.Append('\n');
+
+  uint32_t count;
+  rv = stream->Write(buffer.Data(), buffer.Length(), &count);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (count != buffer.Length()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  for (uint32_t i = 0, len = aData.Length(); i < len; ++i) {
+    // We have an assertion further up the stack, but as a last
+    // resort avoid writing out broken entries here.
+    if (!ServiceWorkerRegistrationDataIsValid(aData[i])) {
+      continue;
+    }
+
+    const mozilla::ipc::PrincipalInfo& info = aData[i].principal();
+
+    MOZ_ASSERT(info.type() ==
+               mozilla::ipc::PrincipalInfo::TContentPrincipalInfo);
+
+    const mozilla::ipc::ContentPrincipalInfo& cInfo =
+        info.get_ContentPrincipalInfo();
+
+    nsAutoCString suffix;
+    cInfo.attrs().CreateSuffix(suffix);
+
+    buffer.Truncate();
+    buffer.Append(suffix.get());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].scope());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].currentWorkerURL());
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].currentWorkerHandlesFetch()
+                      ? SERVICEWORKERREGISTRAR_TRUE
+                      : SERVICEWORKERREGISTRAR_FALSE);
+    buffer.Append('\n');
+
+    buffer.Append(NS_ConvertUTF16toUTF8(aData[i].cacheName()));
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].updateViaCache(), 16);
+    buffer.Append('\n');
+    MOZ_DIAGNOSTIC_ASSERT(
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_IMPORTS ||
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_ALL ||
+        aData[i].updateViaCache() ==
+            nsIServiceWorkerRegistrationInfo::UPDATE_VIA_CACHE_NONE);
+
+    static_assert(nsIRequest::LOAD_NORMAL == 0,
+                  "LOAD_NORMAL matches serialized value.");
+    static_assert(nsIRequest::VALIDATE_ALWAYS == (1 << 11),
+                  "VALIDATE_ALWAYS matches serialized value");
+
+    buffer.AppendInt(aData[i].currentWorkerInstalledTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].currentWorkerActivatedTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(aData[i].lastUpdateTime());
+    buffer.Append('\n');
+
+    buffer.AppendInt(
+        static_cast<int32_t>(aData[i].navigationPreloadState().enabled()));
+    buffer.Append('\n');
+
+    buffer.Append(aData[i].navigationPreloadState().headerValue());
+    buffer.Append('\n');
+
+    buffer.AppendLiteral(SERVICEWORKERREGISTRAR_TERMINATOR);
+    buffer.Append('\n');
+
+    rv = stream->Write(buffer.Data(), buffer.Length(), &count);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    if (count != buffer.Length()) {
+      return NS_ERROR_UNEXPECTED;
+    }
+  }
+
+  nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(stream);
+  MOZ_ASSERT(safeStream);
+
+  rv = safeStream->Finish();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+void ServiceWorkerRegistrar::ProfileStarted() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MonitorAutoLock lock(mMonitor);
+  MOZ_DIAGNOSTIC_ASSERT(!mProfileDir);
+
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(mProfileDir));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsAutoString blockerName;
+  MOZ_ALWAYS_SUCCEEDS(GetName(blockerName));
+
+  rv = GetShutdownPhase()->AddBlocker(
+      this, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__, blockerName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target, "Must have stream transport service");
+
+  nsCOMPtr<nsIRunnable> runnable =
+      NewRunnableMethod("dom::ServiceWorkerRegistrar::LoadData", this,
+                        &ServiceWorkerRegistrar::LoadData);
+  rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch the LoadDataRunnable.");
+  }
+}
+
+void ServiceWorkerRegistrar::ProfileStopped() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  MonitorAutoLock lock(mMonitor);
+
+  if (!mProfileDir) {
+    nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                         getter_AddRefs(mProfileDir));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      // If we do not have a profile directory, we are somehow screwed.
+      MOZ_DIAGNOSTIC_ASSERT(
+          false,
+          "NS_GetSpecialDirectory for NS_APP_USER_PROFILE_50_DIR failed!");
+    }
+  }
+
+  // Mutations to the ServiceWorkerRegistrar happen on the PBackground thread,
+  // issued by the ServiceWorkerManagerService, so the appropriate place to
+  // trigger shutdown is on that thread.
+  //
+  // However, it's quite possible that the PBackground thread was not brought
+  // into existence for xpcshell tests.  We don't cause it to be created
+  // ourselves for any reason, for example.
+  //
+  // In this scenario, we know that:
+  // - We will receive exactly one call to ourself from BlockShutdown() and
+  //   BlockShutdown() will be called (at most) once.
+  // - The only way our Shutdown() method gets called is via
+  //   BackgroundParentImpl::RecvShutdownServiceWorkerRegistrar() being
+  //   invoked, which only happens if we get to that send below here that we
+  //   can't get to.
+  // - All Shutdown() does is set mShuttingDown=true (essential for
+  //   invariants) and invoke MaybeScheduleShutdownCompleted().
+  // - Since there is no PBackground thread, mSaveDataRunnableDispatched must
+  //   be false because only MaybeScheduleSaveData() set it and it only runs
+  //   on the background thread, so it cannot have run.  And so we would
+  //   expect MaybeScheduleShutdownCompleted() to schedule an invocation of
+  //   ShutdownCompleted on the main thread.
+  PBackgroundChild* child = BackgroundChild::GetForCurrentThread();
+  if (mProfileDir && child) {
+    if (child->SendShutdownServiceWorkerRegistrar()) {
+      // Normal shutdown sequence has been initiated, go home.
+      return;
+    }
+    // If we get here, the PBackground thread has probably gone nuts and we
+    // want to know it.
+    MOZ_DIAGNOSTIC_ASSERT(
+        false, "Unable to send the ShutdownServiceWorkerRegistrar message.");
+  }
+
+  // On any error it's appropriate to set mShuttingDown=true (as Shutdown
+  // would do) and directly invoke ShutdownCompleted() (as Shutdown would
+  // indirectly do via MaybeScheduleShutdownCompleted) in order to unblock
+  // shutdown.
+  mShuttingDown = true;
+  ShutdownCompleted();
+}
+
+// Async shutdown blocker methods
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::BlockShutdown(nsIAsyncShutdownClient* aClient) {
+  ProfileStopped();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::GetName(nsAString& aName) {
+  aName = u"ServiceWorkerRegistrar: Flushing data"_ns;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::GetState(nsIPropertyBag** aBagOut) {
+  nsCOMPtr<nsIWritablePropertyBag2> propertyBag =
+      do_CreateInstance("@mozilla.org/hash-property-bag;1");
+
+  MOZ_TRY(propertyBag->SetPropertyAsBool(u"shuttingDown"_ns, mShuttingDown));
+
+  MOZ_TRY(propertyBag->SetPropertyAsBool(u"saveDataRunnableDispatched"_ns,
+                                         mSaveDataRunnableDispatched));
+
+  propertyBag.forget(aBagOut);
+
+  return NS_OK;
+}
+
+#define RELEASE_ASSERT_SUCCEEDED(rv, name)                                    \
+  do {                                                                        \
+    if (NS_FAILED(rv)) {                                                      \
+      if (rv == NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS) {                 \
+        if (auto* context = CycleCollectedJSContext::Get()) {                 \
+          if (RefPtr<Exception> exn = context->GetPendingException()) {       \
+            MOZ_CRASH_UNSAFE_PRINTF("Failed to get " name ": %s",             \
+                                    exn->GetMessageMoz().get());              \
+          }                                                                   \
+        }                                                                     \
+      }                                                                       \
+                                                                              \
+      nsAutoCString errorName;                                                \
+      GetErrorName(rv, errorName);                                            \
+      MOZ_CRASH_UNSAFE_PRINTF("Failed to get " name ": %s", errorName.get()); \
+    }                                                                         \
+  } while (0)
+
+nsCOMPtr<nsIAsyncShutdownClient> ServiceWorkerRegistrar::GetShutdownPhase()
+    const {
+  nsresult rv;
+  nsCOMPtr<nsIAsyncShutdownService> svc =
+      do_GetService("@mozilla.org/async-shutdown-service;1", &rv);
+  // If this fails, something is very wrong on the JS side (or we're out of
+  // memory), and there's no point in continuing startup. Include as much
+  // information as possible in the crash report.
+  RELEASE_ASSERT_SUCCEEDED(rv, "async shutdown service");
+
+  nsCOMPtr<nsIAsyncShutdownClient> client;
+  rv = svc->GetProfileBeforeChange(getter_AddRefs(client));
+  RELEASE_ASSERT_SUCCEEDED(rv, "profileBeforeChange shutdown blocker");
+  return client;
+}
+
+#undef RELEASE_ASSERT_SUCCEEDED
+
+void ServiceWorkerRegistrar::Shutdown() {
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(!mShuttingDown);
+
+  mShuttingDown = true;
+  MaybeScheduleShutdownCompleted();
+}
+
+NS_IMETHODIMP
+ServiceWorkerRegistrar::Observe(nsISupports* aSubject, const char* aTopic,
+                                const char16_t* aData) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!strcmp(aTopic, "profile-after-change")) {
+    nsCOMPtr<nsIObserverService> observerService =
+        services::GetObserverService();
+    observerService->RemoveObserver(this, "profile-after-change");
+
+    // The profile is fully loaded, now we can proceed with the loading of data
+    // from disk.
+    ProfileStarted();
+
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(false, "ServiceWorkerRegistrar got unexpected topic!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+}  // namespace mozilla::dom