Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 448 insertions, 0 deletions

diff --git a/dom/localstorage/LSDatabase.cpp b/dom/localstorage/LSDatabase.cpp
new file mode 100644
index 0000000000..2dccdaad26
--- /dev/null
+++ b/dom/localstorage/LSDatabase.cpp
@@ -0,0 +1,448 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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 "LSDatabase.h"
+
+// Local includes
+#include "ActorsChild.h"
+#include "LSObject.h"
+#include "LSSnapshot.h"
+
+// Global includes
+#include <cstring>
+#include <new>
+#include <utility>
+#include "MainThreadUtils.h"
+#include "mozilla/MacroForEach.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/dom/PBackgroundLSDatabase.h"
+#include "nsBaseHashtable.h"
+#include "nsCOMPtr.h"
+#include "nsTHashMap.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsHashKeys.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nscore.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+#define XPCOM_SHUTDOWN_OBSERVER_TOPIC "xpcom-shutdown"
+
+using LSDatabaseHashtable = nsTHashMap<nsCStringHashKey, LSDatabase*>;
+
+StaticAutoPtr<LSDatabaseHashtable> gLSDatabases;
+
+}  // namespace
+
+StaticRefPtr<LSDatabase::Observer> LSDatabase::sObserver;
+
+class LSDatabase::Observer final : public nsIObserver {
+  bool mInvalidated;
+
+ public:
+  Observer() : mInvalidated(false) { MOZ_ASSERT(NS_IsMainThread()); }
+
+  void Invalidate() { mInvalidated = true; }
+
+ private:
+  ~Observer() { MOZ_ASSERT(NS_IsMainThread()); }
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+};
+
+LSDatabase::LSDatabase(const nsACString& aOrigin)
+    : mActor(nullptr),
+      mSnapshot(nullptr),
+      mOrigin(aOrigin),
+      mAllowedToClose(false),
+      mRequestedAllowToClose(false) {
+  AssertIsOnOwningThread();
+
+  if (!gLSDatabases) {
+    gLSDatabases = new LSDatabaseHashtable();
+
+    MOZ_ASSERT(!sObserver);
+
+    sObserver = new Observer();
+
+    nsCOMPtr<nsIObserverService> obsSvc =
+        mozilla::services::GetObserverService();
+    MOZ_ASSERT(obsSvc);
+
+    MOZ_ALWAYS_SUCCEEDS(
+        obsSvc->AddObserver(sObserver, XPCOM_SHUTDOWN_OBSERVER_TOPIC, false));
+  }
+
+  MOZ_ASSERT(!gLSDatabases->Contains(mOrigin));
+  gLSDatabases->InsertOrUpdate(mOrigin, this);
+}
+
+LSDatabase::~LSDatabase() {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(!mSnapshot);
+
+  if (!mAllowedToClose) {
+    AllowToClose();
+  }
+
+  if (mActor) {
+    mActor->SendDeleteMeInternal();
+    MOZ_ASSERT(!mActor, "SendDeleteMeInternal should have cleared!");
+  }
+}
+
+// static
+LSDatabase* LSDatabase::Get(const nsACString& aOrigin) {
+  return gLSDatabases ? gLSDatabases->Get(aOrigin) : nullptr;
+}
+
+void LSDatabase::SetActor(LSDatabaseChild* aActor) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aActor);
+  MOZ_ASSERT(!mActor);
+
+  mActor = aActor;
+}
+
+void LSDatabase::RequestAllowToClose() {
+  AssertIsOnOwningThread();
+
+  if (mRequestedAllowToClose) {
+    return;
+  }
+
+  mRequestedAllowToClose = true;
+
+  if (mSnapshot) {
+    mSnapshot->MarkDirty();
+  } else {
+    AllowToClose();
+  }
+}
+
+void LSDatabase::NoteFinishedSnapshot(LSSnapshot* aSnapshot) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aSnapshot == mSnapshot);
+
+  mSnapshot = nullptr;
+
+  if (mRequestedAllowToClose) {
+    AllowToClose();
+  }
+}
+
+// All these methods assert `!mAllowedToClose` because they shoudn't be called
+// if the database is being closed. Callers should first check the state by
+// calling `IsAlloweToClose` and eventually obtain a new database.
+
+nsresult LSDatabase::GetLength(LSObject* aObject, uint32_t* aResult) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, VoidString());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->GetLength(aResult);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::GetKey(LSObject* aObject, uint32_t aIndex,
+                            nsAString& aResult) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, VoidString());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->GetKey(aIndex, aResult);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::GetItem(LSObject* aObject, const nsAString& aKey,
+                             nsAString& aResult) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, aKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->GetItem(aKey, aResult);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::GetKeys(LSObject* aObject, nsTArray<nsString>& aKeys) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, VoidString());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->GetKeys(aKeys);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::SetItem(LSObject* aObject, const nsAString& aKey,
+                             const nsAString& aValue,
+                             LSNotifyInfo& aNotifyInfo) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, aKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->SetItem(aKey, aValue, aNotifyInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::RemoveItem(LSObject* aObject, const nsAString& aKey,
+                                LSNotifyInfo& aNotifyInfo) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, aKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->RemoveItem(aKey, aNotifyInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::Clear(LSObject* aObject, LSNotifyInfo& aNotifyInfo) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  nsresult rv = EnsureSnapshot(aObject, VoidString());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mSnapshot->Clear(aNotifyInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::BeginExplicitSnapshot(LSObject* aObject) {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+  MOZ_ASSERT(!mSnapshot);
+
+  nsresult rv = EnsureSnapshot(aObject, VoidString(), /* aExplicit */ true);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::CheckpointExplicitSnapshot() {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+  MOZ_ASSERT(mSnapshot);
+  MOZ_ASSERT(mSnapshot->Explicit());
+
+  nsresult rv = mSnapshot->ExplicitCheckpoint();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult LSDatabase::EndExplicitSnapshot() {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+  MOZ_ASSERT(mSnapshot);
+  MOZ_ASSERT(mSnapshot->Explicit());
+
+  nsresult rv = mSnapshot->ExplicitEnd();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+bool LSDatabase::HasSnapshot() const {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  return !!mSnapshot;
+}
+
+int64_t LSDatabase::GetSnapshotUsage() const {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT(!mAllowedToClose);
+  MOZ_ASSERT(mSnapshot);
+
+  return mSnapshot->GetUsage();
+}
+
+nsresult LSDatabase::EnsureSnapshot(LSObject* aObject, const nsAString& aKey,
+                                    bool aExplicit) {
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(mActor);
+  MOZ_ASSERT_IF(mSnapshot, !aExplicit);
+  MOZ_ASSERT(!mAllowedToClose);
+
+  if (mSnapshot) {
+    return NS_OK;
+  }
+
+  RefPtr<LSSnapshot> snapshot = new LSSnapshot(this);
+
+  LSSnapshotChild* actor = new LSSnapshotChild(snapshot);
+
+  LSSnapshotInitInfo initInfo;
+  bool ok = mActor->SendPBackgroundLSSnapshotConstructor(
+      actor, aObject->DocumentURI(), nsString(aKey),
+      /* increasePeakUsage */ true,
+      /* minSize */ 0, &initInfo);
+  if (NS_WARN_IF(!ok)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  snapshot->SetActor(actor);
+
+  // This add refs snapshot.
+  nsresult rv = snapshot->Init(aKey, initInfo, aExplicit);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // This is cleared in LSSnapshot::Run() before the snapshot is destroyed.
+  mSnapshot = snapshot;
+
+  return NS_OK;
+}
+
+void LSDatabase::AllowToClose() {
+  AssertIsOnOwningThread();
+  MOZ_ASSERT(!mAllowedToClose);
+  MOZ_ASSERT(!mSnapshot);
+
+  mAllowedToClose = true;
+
+  if (mActor) {
+    mActor->SendAllowToClose();
+  }
+
+  MOZ_ASSERT(gLSDatabases);
+  MOZ_ASSERT(gLSDatabases->Get(mOrigin));
+  gLSDatabases->Remove(mOrigin);
+
+  if (!gLSDatabases->Count()) {
+    gLSDatabases = nullptr;
+
+    MOZ_ASSERT(sObserver);
+
+    nsCOMPtr<nsIObserverService> obsSvc =
+        mozilla::services::GetObserverService();
+    MOZ_ASSERT(obsSvc);
+
+    MOZ_ALWAYS_SUCCEEDS(
+        obsSvc->RemoveObserver(sObserver, XPCOM_SHUTDOWN_OBSERVER_TOPIC));
+
+    // We also need to invalidate the observer because AllowToClose can be
+    // triggered by an indirectly related observer, so the observer service
+    // may still keep our observer alive and call Observe on it. This is
+    // possible because observer service snapshots the observer list for given
+    // subject before looping over the list.
+    sObserver->Invalidate();
+
+    sObserver = nullptr;
+  }
+}
+
+NS_IMPL_ISUPPORTS(LSDatabase::Observer, nsIObserver)
+
+NS_IMETHODIMP
+LSDatabase::Observer::Observe(nsISupports* aSubject, const char* aTopic,
+                              const char16_t* aData) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!strcmp(aTopic, XPCOM_SHUTDOWN_OBSERVER_TOPIC));
+
+  if (mInvalidated) {
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(gLSDatabases);
+
+  for (const RefPtr<LSDatabase>& database :
+       ToTArray<nsTArray<RefPtr<LSDatabase>>>(gLSDatabases->Values())) {
+    database->RequestAllowToClose();
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom