Add m-esr52 at 52.6.0

1 files changed, 379 insertions, 0 deletions

diff --git a/dom/filesystem/FileSystemTaskBase.cpp b/dom/filesystem/FileSystemTaskBase.cpp
new file mode 100644
index 0000000000..481002b7d0
--- /dev/null
+++ b/dom/filesystem/FileSystemTaskBase.cpp
@@ -0,0 +1,379 @@
+/* -*- 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 "mozilla/dom/FileSystemTaskBase.h"
+
+#include "nsNetCID.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/FileSystemBase.h"
+#include "mozilla/dom/FileSystemRequestParent.h"
+#include "mozilla/dom/FileSystemUtils.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/ipc/BlobParent.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/Unused.h"
+#include "nsProxyRelease.h"
+
+namespace mozilla {
+namespace dom {
+
+namespace {
+
+nsresult
+FileSystemErrorFromNsError(const nsresult& aErrorValue)
+{
+  uint16_t module = NS_ERROR_GET_MODULE(aErrorValue);
+  if (module == NS_ERROR_MODULE_DOM_FILESYSTEM ||
+      module == NS_ERROR_MODULE_DOM_FILE ||
+      module == NS_ERROR_MODULE_DOM) {
+    return aErrorValue;
+  }
+
+  switch (aErrorValue) {
+    case NS_OK:
+      return NS_OK;
+
+    case NS_ERROR_FILE_INVALID_PATH:
+    case NS_ERROR_FILE_UNRECOGNIZED_PATH:
+      return NS_ERROR_DOM_FILESYSTEM_INVALID_PATH_ERR;
+
+    case NS_ERROR_FILE_DESTINATION_NOT_DIR:
+      return NS_ERROR_DOM_FILESYSTEM_INVALID_MODIFICATION_ERR;
+
+    case NS_ERROR_FILE_ACCESS_DENIED:
+    case NS_ERROR_FILE_DIR_NOT_EMPTY:
+      return NS_ERROR_DOM_FILESYSTEM_NO_MODIFICATION_ALLOWED_ERR;
+
+    case NS_ERROR_FILE_TARGET_DOES_NOT_EXIST:
+    case NS_ERROR_NOT_AVAILABLE:
+      return NS_ERROR_DOM_FILE_NOT_FOUND_ERR;
+
+    case NS_ERROR_FILE_ALREADY_EXISTS:
+      return NS_ERROR_DOM_FILESYSTEM_PATH_EXISTS_ERR;
+
+    case NS_ERROR_FILE_NOT_DIRECTORY:
+      return NS_ERROR_DOM_FILESYSTEM_TYPE_MISMATCH_ERR;
+
+    case NS_ERROR_UNEXPECTED:
+    default:
+      return NS_ERROR_DOM_FILESYSTEM_UNKNOWN_ERR;
+  }
+}
+
+nsresult
+DispatchToIOThread(nsIRunnable* aRunnable)
+{
+  MOZ_ASSERT(aRunnable);
+
+  nsCOMPtr<nsIEventTarget> target
+    = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_ASSERT(target);
+
+  return target->Dispatch(aRunnable, NS_DISPATCH_NORMAL);
+}
+
+// This runnable is used when an error value is set before doing any real
+// operation on the I/O thread. In this case we skip all and we directly
+// communicate the error.
+class ErrorRunnable final : public CancelableRunnable
+{
+public:
+  explicit ErrorRunnable(FileSystemTaskChildBase* aTask)
+    : mTask(aTask)
+  {
+    MOZ_ASSERT(aTask);
+  }
+
+  NS_IMETHOD
+  Run() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mTask->HasError());
+
+    mTask->HandlerCallback();
+    return NS_OK;
+  }
+
+private:
+  RefPtr<FileSystemTaskChildBase> mTask;
+};
+
+} // anonymous namespace
+
+NS_IMPL_ISUPPORTS(FileSystemTaskChildBase, nsIIPCBackgroundChildCreateCallback)
+
+/**
+ * FileSystemTaskBase class
+ */
+
+FileSystemTaskChildBase::FileSystemTaskChildBase(FileSystemBase* aFileSystem)
+  : mErrorValue(NS_OK)
+  , mFileSystem(aFileSystem)
+{
+  MOZ_ASSERT(aFileSystem, "aFileSystem should not be null.");
+  aFileSystem->AssertIsOnOwningThread();
+}
+
+FileSystemTaskChildBase::~FileSystemTaskChildBase()
+{
+  mFileSystem->AssertIsOnOwningThread();
+}
+
+FileSystemBase*
+FileSystemTaskChildBase::GetFileSystem() const
+{
+  mFileSystem->AssertIsOnOwningThread();
+  return mFileSystem.get();
+}
+
+void
+FileSystemTaskChildBase::Start()
+{
+  mFileSystem->AssertIsOnOwningThread();
+
+  mozilla::ipc::PBackgroundChild* actor =
+    mozilla::ipc::BackgroundChild::GetForCurrentThread();
+  if (actor) {
+    ActorCreated(actor);
+  } else {
+    if (NS_WARN_IF(
+        !mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread(this))) {
+      MOZ_CRASH();
+    }
+  }
+}
+
+void
+FileSystemTaskChildBase::ActorFailed()
+{
+  MOZ_CRASH("Failed to create a PBackgroundChild actor!");
+}
+
+void
+FileSystemTaskChildBase::ActorCreated(mozilla::ipc::PBackgroundChild* aActor)
+{
+  if (HasError()) {
+    // In this case we don't want to use IPC at all.
+    RefPtr<ErrorRunnable> runnable = new ErrorRunnable(this);
+    DebugOnly<nsresult> rv = NS_DispatchToCurrentThread(runnable);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToCurrentThread failed");
+    return;
+  }
+
+  if (mFileSystem->IsShutdown()) {
+    return;
+  }
+
+  nsAutoString serialization;
+  mFileSystem->SerializeDOMPath(serialization);
+
+  ErrorResult rv;
+  FileSystemParams params = GetRequestParams(serialization, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+    return;
+  }
+
+  // Retain a reference so the task object isn't deleted without IPDL's
+  // knowledge. The reference will be released by
+  // mozilla::ipc::BackgroundChildImpl::DeallocPFileSystemRequestChild.
+  NS_ADDREF_THIS();
+
+  mozilla::ipc::PBackgroundChild* actor =
+    mozilla::ipc::BackgroundChild::GetForCurrentThread();
+  MOZ_ASSERT(actor);
+
+  actor->SendPFileSystemRequestConstructor(this, params);
+}
+
+void
+FileSystemTaskChildBase::SetRequestResult(const FileSystemResponseValue& aValue)
+{
+  mFileSystem->AssertIsOnOwningThread();
+
+  if (aValue.type() == FileSystemResponseValue::TFileSystemErrorResponse) {
+    FileSystemErrorResponse r = aValue;
+    mErrorValue = r.error();
+  } else {
+    ErrorResult rv;
+    SetSuccessRequestResult(aValue, rv);
+    mErrorValue = rv.StealNSResult();
+  }
+}
+
+bool
+FileSystemTaskChildBase::Recv__delete__(const FileSystemResponseValue& aValue)
+{
+  mFileSystem->AssertIsOnOwningThread();
+
+  SetRequestResult(aValue);
+  HandlerCallback();
+  return true;
+}
+
+void
+FileSystemTaskChildBase::SetError(const nsresult& aErrorValue)
+{
+  mErrorValue = FileSystemErrorFromNsError(aErrorValue);
+}
+
+/**
+ * FileSystemTaskParentBase class
+ */
+
+FileSystemTaskParentBase::FileSystemTaskParentBase(FileSystemBase* aFileSystem,
+                                                   const FileSystemParams& aParam,
+                                                   FileSystemRequestParent* aParent)
+  : mErrorValue(NS_OK)
+  , mFileSystem(aFileSystem)
+  , mRequestParent(aParent)
+  , mBackgroundEventTarget(NS_GetCurrentThread())
+{
+  MOZ_ASSERT(XRE_IsParentProcess(),
+             "Only call from parent process!");
+  MOZ_ASSERT(aFileSystem, "aFileSystem should not be null.");
+  MOZ_ASSERT(aParent);
+  MOZ_ASSERT(mBackgroundEventTarget);
+  AssertIsOnBackgroundThread();
+}
+
+FileSystemTaskParentBase::~FileSystemTaskParentBase()
+{
+  // This task can be released on different threads because we dispatch it (as
+  // runnable) to main-thread, I/O and then back to the PBackground thread.
+  NS_ProxyRelease(mBackgroundEventTarget, mFileSystem.forget());
+  NS_ProxyRelease(mBackgroundEventTarget, mRequestParent.forget());
+}
+
+void
+FileSystemTaskParentBase::Start()
+{
+  AssertIsOnBackgroundThread();
+  mFileSystem->AssertIsOnOwningThread();
+
+  if (NeedToGoToMainThread()) {
+    DebugOnly<nsresult> rv = NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL);
+    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToCurrentThread failed");
+    return;
+  }
+
+  DebugOnly<nsresult> rv = DispatchToIOThread(this);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "DispatchToIOThread failed");
+}
+
+void
+FileSystemTaskParentBase::HandleResult()
+{
+  AssertIsOnBackgroundThread();
+  mFileSystem->AssertIsOnOwningThread();
+
+  if (mFileSystem->IsShutdown()) {
+    return;
+  }
+
+  MOZ_ASSERT(mRequestParent);
+  Unused << mRequestParent->Send__delete__(mRequestParent, GetRequestResult());
+}
+
+FileSystemResponseValue
+FileSystemTaskParentBase::GetRequestResult() const
+{
+  AssertIsOnBackgroundThread();
+  mFileSystem->AssertIsOnOwningThread();
+
+  if (HasError()) {
+    return FileSystemErrorResponse(mErrorValue);
+  }
+
+  ErrorResult rv;
+  FileSystemResponseValue value = GetSuccessRequestResult(rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    return FileSystemErrorResponse(rv.StealNSResult());
+  }
+
+  return value;
+}
+
+void
+FileSystemTaskParentBase::SetError(const nsresult& aErrorValue)
+{
+  mErrorValue = FileSystemErrorFromNsError(aErrorValue);
+}
+
+bool
+FileSystemTaskParentBase::NeedToGoToMainThread() const
+{
+  return mFileSystem->NeedToGoToMainThread();
+}
+
+nsresult
+FileSystemTaskParentBase::MainThreadWork()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  return mFileSystem->MainThreadWork();
+}
+
+NS_IMETHODIMP
+FileSystemTaskParentBase::Run()
+{
+  // This method can run in 3 different threads. Here why:
+  // 1. if we are on the main-thread it's because the task must do something
+  //    here. If no errors are returned we go the step 2.
+  // 2. We can be here directly if the task doesn't have nothing to do on the
+  //    main-thread. We are are on the I/O thread and we call IOWork().
+  // 3. Both step 1 (in case of error) and step 2 end up here where return the
+  //    value back to the PBackground thread.
+  if (NS_IsMainThread()) {
+    MOZ_ASSERT(NeedToGoToMainThread());
+
+    nsresult rv = MainThreadWork();
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      SetError(rv);
+
+      // Something when wrong. Let's go to the Background thread directly
+      // skipping the I/O thread step.
+      rv = mBackgroundEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+    }
+
+    // Next step must happen on the I/O thread.
+    rv = DispatchToIOThread(this);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    return NS_OK;
+  }
+
+  // Run I/O thread tasks
+  if (!IsOnBackgroundThread()) {
+    nsresult rv = IOWork();
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      SetError(rv);
+    }
+
+    // Let's go back to PBackground thread to finish the work.
+    rv = mBackgroundEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    return NS_OK;
+  }
+
+  // If we are here, it's because the I/O work has been done and we have to
+  // handle the result back via IPC.
+  AssertIsOnBackgroundThread();
+  HandleResult();
+  return NS_OK;
+}
+
+} // namespace dom
+} // namespace mozilla