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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 http://mozilla.org/MPL/2.0/. */
#include "nsDNSPrefetch.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsIDNSListener.h"
#include "nsIDNSService.h"
#include "nsIDNSByTypeRecord.h"
#include "nsICancelable.h"
#include "nsIURI.h"
#include "mozilla/Atomics.h"
#include "mozilla/Preferences.h"
static nsIDNSService* sDNSService = nullptr;
nsresult nsDNSPrefetch::Initialize(nsIDNSService* aDNSService) {
MOZ_ASSERT(NS_IsMainThread());
NS_IF_RELEASE(sDNSService);
sDNSService = aDNSService;
NS_IF_ADDREF(sDNSService);
return NS_OK;
}
nsresult nsDNSPrefetch::Shutdown() {
NS_IF_RELEASE(sDNSService);
return NS_OK;
}
nsDNSPrefetch::nsDNSPrefetch(nsIURI* aURI,
mozilla::OriginAttributes& aOriginAttributes,
nsIRequest::TRRMode aTRRMode,
nsIDNSListener* aListener, bool storeTiming)
: mOriginAttributes(aOriginAttributes),
mStoreTiming(storeTiming),
mTRRMode(aTRRMode),
mListener(do_GetWeakReference(aListener)) {
aURI->GetAsciiHost(mHostname);
}
nsDNSPrefetch::nsDNSPrefetch(nsIURI* aURI,
mozilla::OriginAttributes& aOriginAttributes,
nsIRequest::TRRMode aTRRMode)
: mOriginAttributes(aOriginAttributes),
mStoreTiming(false),
mTRRMode(aTRRMode),
mListener(nullptr) {
aURI->GetAsciiHost(mHostname);
}
nsresult nsDNSPrefetch::Prefetch(uint32_t flags) {
if (mHostname.IsEmpty()) return NS_ERROR_NOT_AVAILABLE;
if (!sDNSService) return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsICancelable> tmpOutstanding;
if (mStoreTiming) mStartTimestamp = mozilla::TimeStamp::Now();
// If AsyncResolve fails, for example because prefetching is disabled,
// then our timing will be useless. However, in such a case,
// mEndTimestamp will be a null timestamp and callers should check
// TimingsValid() before using the timing.
nsCOMPtr<nsIEventTarget> target = mozilla::GetCurrentEventTarget();
flags |= nsIDNSService::GetFlagsFromTRRMode(mTRRMode);
return sDNSService->AsyncResolveNative(
mHostname, nsIDNSService::RESOLVE_TYPE_DEFAULT,
flags | nsIDNSService::RESOLVE_SPECULATE, nullptr, this, target,
mOriginAttributes, getter_AddRefs(tmpOutstanding));
}
nsresult nsDNSPrefetch::PrefetchLow(bool refreshDNS) {
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_LOW |
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
}
nsresult nsDNSPrefetch::PrefetchMedium(bool refreshDNS) {
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_MEDIUM |
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
}
nsresult nsDNSPrefetch::PrefetchHigh(bool refreshDNS) {
return Prefetch(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0);
}
namespace {
class HTTPSRRListener final : public nsIDNSListener {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIDNSLISTENER
explicit HTTPSRRListener(
std::function<void(nsIDNSHTTPSSVCRecord*)>&& aCallback)
: mResultCallback(std::move(aCallback)) {}
private:
~HTTPSRRListener() = default;
std::function<void(nsIDNSHTTPSSVCRecord*)> mResultCallback;
};
NS_IMPL_ISUPPORTS(HTTPSRRListener, nsIDNSListener)
NS_IMETHODIMP
HTTPSRRListener::OnLookupComplete(nsICancelable* aRequest, nsIDNSRecord* aRec,
nsresult aStatus) {
if (NS_FAILED(aStatus)) {
mResultCallback(nullptr);
return NS_OK;
}
nsCOMPtr<nsIDNSHTTPSSVCRecord> httpsRecord = do_QueryInterface(aRec);
mResultCallback(httpsRecord);
return NS_OK;
}
}; // namespace
nsresult nsDNSPrefetch::FetchHTTPSSVC(
bool aRefreshDNS, bool aPrefetch,
std::function<void(nsIDNSHTTPSSVCRecord*)>&& aCallback) {
if (!sDNSService) {
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIEventTarget> target = mozilla::GetCurrentEventTarget();
uint32_t flags = nsIDNSService::GetFlagsFromTRRMode(mTRRMode);
if (aRefreshDNS) {
flags |= nsIDNSService::RESOLVE_BYPASS_CACHE;
}
if (aPrefetch) {
flags |= nsIDNSService::RESOLVE_SPECULATE;
}
nsCOMPtr<nsICancelable> tmpOutstanding;
nsCOMPtr<nsIDNSListener> listener = new HTTPSRRListener(std::move(aCallback));
return sDNSService->AsyncResolveNative(
mHostname, nsIDNSService::RESOLVE_TYPE_HTTPSSVC, flags, nullptr, listener,
target, mOriginAttributes, getter_AddRefs(tmpOutstanding));
}
NS_IMPL_ISUPPORTS(nsDNSPrefetch, nsIDNSListener)
NS_IMETHODIMP
nsDNSPrefetch::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
nsresult status) {
if (mStoreTiming) {
mEndTimestamp = mozilla::TimeStamp::Now();
}
nsCOMPtr<nsIDNSListener> listener = do_QueryReferent(mListener);
if (listener) {
listener->OnLookupComplete(request, rec, status);
}
return NS_OK;
}