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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 */
#ifndef mozilla_dom_FetchDriver_h
#define mozilla_dom_FetchDriver_h
#include "nsIChannelEventSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIStreamListener.h"
#include "nsIThreadRetargetableStreamListener.h"
#include "mozilla/ConsoleReportCollector.h"
#include "mozilla/dom/AbortSignal.h"
#include "mozilla/dom/SafeRefPtr.h"
#include "mozilla/dom/SerializedStackHolder.h"
#include "mozilla/dom/SRIMetadata.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/DebugOnly.h"
class nsIConsoleReportCollector;
class nsICookieJarSettings;
class nsICSPEventListener;
class nsIEventTarget;
class nsIOutputStream;
class nsILoadGroup;
class nsIPrincipal;
namespace mozilla {
class PreloaderBase;
namespace dom {
class Document;
class InternalRequest;
class InternalResponse;
class PerformanceStorage;
* Provides callbacks to be called when response is available or on error.
* Implemenations usually resolve or reject the promise returned from fetch().
* The callbacks can be called synchronously or asynchronously from
* FetchDriver::Fetch.
class FetchDriverObserver {
: mReporter(new ConsoleReportCollector()), mGotResponseAvailable(false) {}
void OnResponseAvailable(InternalResponse* aResponse) {
mGotResponseAvailable = true;
enum EndReason {
virtual void OnResponseEnd(EndReason aReason){};
nsIConsoleReportCollector* GetReporter() const { return mReporter; }
virtual void FlushConsoleReport() = 0;
// Called in OnStartRequest() to determine if the OnDataAvailable() method
// needs to be called. Invoking that method may generate additional main
// thread runnables.
virtual bool NeedOnDataAvailable() = 0;
// Called once when the first byte of data is received iff
// NeedOnDataAvailable() returned true when called in OnStartRequest().
virtual void OnDataAvailable() = 0;
virtual ~FetchDriverObserver() = default;
virtual void OnResponseAvailableInternal(InternalResponse* aResponse) = 0;
nsCOMPtr<nsIConsoleReportCollector> mReporter;
bool mGotResponseAvailable;
class AlternativeDataStreamListener;
class FetchDriver final : public nsIStreamListener,
public nsIChannelEventSink,
public nsIInterfaceRequestor,
public nsIThreadRetargetableStreamListener,
public AbortFollower {
FetchDriver(SafeRefPtr<InternalRequest> aRequest, nsIPrincipal* aPrincipal,
nsILoadGroup* aLoadGroup, nsIEventTarget* aMainThreadEventTarget,
nsICookieJarSettings* aCookieJarSettings,
PerformanceStorage* aPerformanceStorage, bool aIsTrackingFetch);
nsresult Fetch(AbortSignalImpl* aSignalImpl, FetchDriverObserver* aObserver);
void SetDocument(Document* aDocument);
void SetCSPEventListener(nsICSPEventListener* aCSPEventListener);
void SetClientInfo(const ClientInfo& aClientInfo);
void SetController(const Maybe<ServiceWorkerDescriptor>& aController);
void SetWorkerScript(const nsACString& aWorkerScript) {
mWorkerScript = aWorkerScript;
void SetOriginStack(UniquePtr<SerializedStackHolder>&& aOriginStack) {
mOriginStack = std::move(aOriginStack);
// AbortFollower
void RunAbortAlgorithm() override;
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCOMPtr<nsILoadGroup> mLoadGroup;
SafeRefPtr<InternalRequest> mRequest;
RefPtr<InternalResponse> mResponse;
nsCOMPtr<nsIOutputStream> mPipeOutputStream;
RefPtr<FetchDriverObserver> mObserver;
RefPtr<Document> mDocument;
nsCOMPtr<nsICSPEventListener> mCSPEventListener;
Maybe<ClientInfo> mClientInfo;
Maybe<ServiceWorkerDescriptor> mController;
nsCOMPtr<nsIChannel> mChannel;
UniquePtr<SRICheckDataVerifier> mSRIDataVerifier;
nsCOMPtr<nsIEventTarget> mMainThreadEventTarget;
nsCOMPtr<nsICookieJarSettings> mCookieJarSettings;
// This is set only when Fetch is used in workers.
RefPtr<PerformanceStorage> mPerformanceStorage;
SRIMetadata mSRIMetadata;
nsCString mWorkerScript;
UniquePtr<SerializedStackHolder> mOriginStack;
// This is written once in OnStartRequest on the main thread and then
// written/read in OnDataAvailable() on any thread. Necko guarantees
// that these do not overlap.
bool mNeedToObserveOnDataAvailable;
bool mIsTrackingFetch;
RefPtr<AlternativeDataStreamListener> mAltDataListener;
bool mOnStopRequestCalled;
// This flag is true when this fetch has found a matching preload and is being
// satisfied by a its response.
bool mFromPreload = false;
// This flag is set in call to Abort() and spans the possible window this
// fetch doesn't have mChannel (to be cancelled) between reuse of the matching
// preload, that has already finished and dropped reference to its channel,
// and OnStartRequest notification. It let's us cancel the load when we get
// the channel in OnStartRequest.
bool mAborted = false;
#ifdef DEBUG
bool mResponseAvailableCalled;
bool mFetchCalled;
friend class AlternativeDataStreamListener;
FetchDriver() = delete;
FetchDriver(const FetchDriver&) = delete;
FetchDriver& operator=(const FetchDriver&) = delete;
already_AddRefed<PreloaderBase> FindPreload(nsIURI* aURI);
void UpdateReferrerInfoFromNewChannel(nsIChannel* aChannel);
nsresult HttpFetch(const nsACString& aPreferredAlternativeDataType = ""_ns);
// Returns the filtered response sent to the observer.
already_AddRefed<InternalResponse> BeginAndGetFilteredResponse(
InternalResponse* aResponse, bool aFoundOpaqueRedirect);
// Utility since not all cases need to do any post processing of the filtered
// response.
void FailWithNetworkError(nsresult rv);
void SetRequestHeaders(nsIHttpChannel* aChannel,
bool aStripRequestBodyHeader) const;
void FinishOnStopRequest(AlternativeDataStreamListener* aAltDataListener);
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_FetchDriver_h