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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsAsyncRedirectVerifyHelper_h
#define nsAsyncRedirectVerifyHelper_h
#include "nsIRunnable.h"
#include "nsIChannelEventSink.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsINamed.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/Attributes.h"
class nsIChannel;
namespace mozilla {
namespace net {
* This class simplifies call of OnChannelRedirect of IOService and
* the sink bound with the channel being redirected while the result of
* redirect decision is returned through the callback.
class nsAsyncRedirectVerifyHelper final
: public nsIRunnable,
public nsINamed,
public nsIAsyncVerifyRedirectCallback {
nsAsyncRedirectVerifyHelper() = default;
* Calls AsyncOnChannelRedirect() on the given sink with the given
* channels and flags. Keeps track of number of async callbacks to expect.
nsresult DelegateOnChannelRedirect(nsIChannelEventSink* sink,
nsIChannel* oldChannel,
nsIChannel* newChannel, uint32_t flags);
* Initialize and run the chain of AsyncOnChannelRedirect calls. OldChannel
* is QI'ed for nsIAsyncVerifyRedirectCallback. The result of the redirect
* decision is passed through this interface back to the oldChannel.
* @param oldChan
* channel being redirected, MUST implement
* nsIAsyncVerifyRedirectCallback
* @param newChan
* target of the redirect channel
* @param flags
* redirect flags
* @param mainThreadEventTarget
* a labeled event target for dispatching runnables
* @param synchronize
* set to TRUE if you want the Init method wait synchronously for
* all redirect callbacks
nsresult Init(nsIChannel* oldChan, nsIChannel* newChan, uint32_t flags,
nsIEventTarget* mainThreadEventTarget,
bool synchronize = false);
nsCOMPtr<nsIChannel> mOldChan;
nsCOMPtr<nsIChannel> mNewChan;
uint32_t mFlags{0};
bool mWaitingForRedirectCallback{false};
nsCOMPtr<nsIEventTarget> mCallbackEventTarget;
bool mCallbackInitiated{false};
int32_t mExpectedCallbacks{0};
nsresult mResult{NS_OK}; // value passed to callback
void InitCallback();
* Calls back to |oldChan| as described in Init()
void ExplicitCallback(nsresult result);
bool IsOldChannelCanceled();
* Helper to make the call-stack handle some control-flow for us
class nsAsyncRedirectAutoCallback {
explicit nsAsyncRedirectAutoCallback(
nsIAsyncVerifyRedirectCallback* aCallback)
: mCallback(aCallback) {
mResult = NS_OK;
~nsAsyncRedirectAutoCallback() {
if (mCallback) mCallback->OnRedirectVerifyCallback(mResult);
* Call this is you want it to call back with a different result-code
void SetResult(nsresult aRes) { mResult = aRes; }
* Call this is you want to avoid the callback
void DontCallback() { mCallback = nullptr; }
nsIAsyncVerifyRedirectCallback* mCallback;
nsresult mResult;
} // namespace net
} // namespace mozilla