DNSListenerProxy.cpp

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/* 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/net/DNSListenerProxy.h"

#include "mozilla/StaticPrefs_network.h"

#include "nsICancelable.h"

#include "nsThreadUtils.h"

namespace mozilla {

namespace net {

NS_IMPL_ADDREF(DNSListenerProxy)

NS_IMPL_RELEASE(DNSListenerProxy)

NS_INTERFACE_MAP_BEGIN(DNSListenerProxy)

  NS_INTERFACE_MAP_ENTRY(nsIDNSListener)

  NS_INTERFACE_MAP_ENTRY_CONCRETE(DNSListenerProxy)

NS_INTERFACE_MAP_END

NS_IMETHODIMP

DNSListenerProxy::OnLookupComplete(nsICancelable* aRequest,

                                   nsIDNSRecord* aRecord, nsresult aStatus) {

  RefPtr<DNSListenerProxy> self = this;

  nsCOMPtr<nsICancelable> request = aRequest;

  nsCOMPtr<nsIDNSRecord> record = aRecord;

  nsCOMPtr<nsIRunnable> event = NS_NewRunnableFunction(

      "DNSListenerProxy::OnLookupComplete", [self, request, record, aStatus]() {

        (void)self->mListener->OnLookupComplete(request, record, aStatus);

        self->mListener = nullptr;

});

  // XXX(valentin) We should also check if we are on the target thread and if

  // true call OnLookupComplete without dispatching.

  // Doing that now causes a deadlock, probably due to a held mutex.

  if (StaticPrefs::network_dns_high_priority_dispatch() &&

      (mTargetThread->GetFeatures() &

       nsIEventTarget::SUPPORTS_PRIORITIZATION)) {

    event = new PrioritizableRunnable(event.forget(),

                                      nsIRunnablePriority::PRIORITY_MEDIUMHIGH);

  nsresult rv = mTargetThread->Dispatch(event.forget(), NS_DISPATCH_NORMAL);

  if (NS_FAILED(rv)) {

    NS_WARNING("DNSListenerProxy::OnLookupComplete dispatch failed.");

  return rv;

}  // namespace net

}  // namespace mozilla