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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /netwerk/base/nsDNSPrefetch.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/base/nsDNSPrefetch.cpp')
-rw-r--r--netwerk/base/nsDNSPrefetch.cpp106
1 files changed, 106 insertions, 0 deletions
diff --git a/netwerk/base/nsDNSPrefetch.cpp b/netwerk/base/nsDNSPrefetch.cpp
new file mode 100644
index 000000000..e09315ed1
--- /dev/null
+++ b/netwerk/base/nsDNSPrefetch.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsICancelable.h"
+#include "nsIURI.h"
+
+static nsIDNSService *sDNSService = nullptr;
+
+nsresult
+nsDNSPrefetch::Initialize(nsIDNSService *aDNSService)
+{
+ 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,
+ nsIDNSListener *aListener,
+ bool storeTiming)
+ : mStoreTiming(storeTiming)
+ , mListener(do_GetWeakReference(aListener))
+{
+ aURI->GetAsciiHost(mHostname);
+}
+
+nsresult
+nsDNSPrefetch::Prefetch(uint16_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<nsIThread> mainThread = do_GetMainThread();
+ return sDNSService->AsyncResolve(mHostname,
+ flags | nsIDNSService::RESOLVE_SPECULATE,
+ this, mainThread,
+ 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);
+}
+
+
+NS_IMPL_ISUPPORTS(nsDNSPrefetch, nsIDNSListener)
+
+NS_IMETHODIMP
+nsDNSPrefetch::OnLookupComplete(nsICancelable *request,
+ nsIDNSRecord *rec,
+ nsresult status)
+{
+ MOZ_ASSERT(NS_IsMainThread(), "Expecting DNS callback on main thread.");
+
+ if (mStoreTiming) {
+ mEndTimestamp = mozilla::TimeStamp::Now();
+ }
+ nsCOMPtr<nsIDNSListener> listener = do_QueryReferent(mListener);
+ if (listener) {
+ listener->OnLookupComplete(request, rec, status);
+ }
+ return NS_OK;
+}