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/* -*- 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/. */
#ifndef mozilla_dom_GetFilesHelper_h
#define mozilla_dom_GetFilesHelper_h
#include "mozilla/MozPromise.h"
#include "mozilla/Mutex.h"
#include "mozilla/RefPtr.h"
#include "nsCycleCollectionTraversalCallback.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
class nsIGlobalObject;
namespace mozilla {
class ErrorResult;
namespace dom {
class BlobImpl;
class ContentParent;
class File;
class GetFilesHelperParent;
class OwningFileOrDirectory;
class Promise;
class GetFilesCallback {
public:
NS_INLINE_DECL_REFCOUNTING(GetFilesCallback);
// This is called once per directory scan and is passed an array of all
// of the files found.
virtual void Callback(nsresult aStatus,
const FallibleTArray<RefPtr<BlobImpl>>& aBlobImpls) = 0;
protected:
virtual ~GetFilesCallback() = default;
};
class GetFilesHelperBase {
protected:
explicit GetFilesHelperBase(bool aRecursiveFlag)
: mRecursiveFlag(aRecursiveFlag) {}
virtual ~GetFilesHelperBase() = default;
virtual bool IsCanceled() { return false; }
nsresult ExploreDirectory(const nsAString& aDOMPath, nsIFile* aFile);
bool mRecursiveFlag;
// We populate this array in the I/O thread with the BlobImpl.
FallibleTArray<RefPtr<BlobImpl>> mTargetBlobImplArray;
};
// Retrieving the list of files can be very time/IO consuming. We use this
// helper class to do it just once.
class GetFilesHelper : public Runnable, public GetFilesHelperBase {
friend class GetFilesHelperParent;
class ReleaseRunnable;
public:
static already_AddRefed<GetFilesHelper> Create(
const nsTArray<OwningFileOrDirectory>& aFilesOrDirectory,
bool aRecursiveFlag, ErrorResult& aRv);
void AddPromise(Promise* aPromise);
void AddCallback(GetFilesCallback* aCallback);
using MozPromiseType =
MozPromise<nsTArray<RefPtr<File>>, nsresult, true>::Private;
void AddMozPromise(MozPromiseType* aPromise, nsIGlobalObject* aGlobal);
// CC methods
void Unlink();
void Traverse(nsCycleCollectionTraversalCallback& cb);
protected:
explicit GetFilesHelper(bool aRecursiveFlag);
virtual ~GetFilesHelper();
void SetDirectoryPaths(nsTArray<nsString>&& aDirectoryPaths) {
mDirectoryPaths = std::move(aDirectoryPaths);
}
virtual bool IsCanceled() override {
MutexAutoLock lock(mMutex);
return mCanceled;
}
virtual void Work(ErrorResult& aRv);
virtual void Cancel() {};
NS_IMETHOD
Run() override;
void RunIO();
void OperationCompleted();
struct MozPromiseAndGlobal {
RefPtr<MozPromiseType> mMozPromise;
RefPtr<nsIGlobalObject> mGlobal;
};
class PromiseAdapter {
public:
explicit PromiseAdapter(MozPromiseAndGlobal&& aMozPromise);
explicit PromiseAdapter(Promise* aDomPromise);
~PromiseAdapter();
void Clear();
void Traverse(nsCycleCollectionTraversalCallback& cb);
nsIGlobalObject* GetGlobalObject();
void Resolve(nsTArray<RefPtr<File>>&& aFiles);
void Reject(nsresult aError);
private:
using PromiseVariant = Variant<RefPtr<Promise>, MozPromiseAndGlobal>;
PromiseVariant mPromise;
};
void AddPromiseInternal(PromiseAdapter&& aPromise);
void ResolveOrRejectPromise(PromiseAdapter&& aPromise);
void RunCallback(GetFilesCallback* aCallback);
bool mListingCompleted;
nsTArray<nsString> mDirectoryPaths;
// Error code to propagate.
nsresult mErrorResult;
nsTArray<PromiseAdapter> mPromises;
nsTArray<RefPtr<GetFilesCallback>> mCallbacks;
Mutex mMutex MOZ_UNANNOTATED;
// This variable is protected by mutex.
bool mCanceled;
};
class GetFilesHelperChild final : public GetFilesHelper {
public:
explicit GetFilesHelperChild(bool aRecursiveFlag)
: GetFilesHelper(aRecursiveFlag), mPendingOperation(false) {}
virtual void Work(ErrorResult& aRv) override;
virtual void Cancel() override;
bool AppendBlobImpl(BlobImpl* aBlobImpl);
void Finished(nsresult aResult);
private:
nsID mUUID;
bool mPendingOperation;
};
class GetFilesHelperParentCallback;
class GetFilesHelperParent final : public GetFilesHelper {
friend class GetFilesHelperParentCallback;
public:
static already_AddRefed<GetFilesHelperParent> Create(
const nsID& aUUID, nsTArray<nsString>&& aDirectoryPaths,
bool aRecursiveFlag, ContentParent* aContentParent, ErrorResult& aRv);
private:
GetFilesHelperParent(const nsID& aUUID, ContentParent* aContentParent,
bool aRecursiveFlag);
~GetFilesHelperParent();
RefPtr<ContentParent> mContentParent;
nsID mUUID;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_GetFilesHelper_h
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