1 files changed, 126 insertions, 0 deletions
diff --git a/netwerk/protocol/http/EarlyHintRegistrar.cpp b/netwerk/protocol/http/EarlyHintRegistrar.cpp
new file mode 100644
index 0000000000..ecbc534d11
--- /dev/null
+++ b/netwerk/protocol/http/EarlyHintRegistrar.cpp
@@ -0,0 +1,126 @@
+/* -*- 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 http://mozilla.org/MPL/2.0/. */
+
+#include "EarlyHintRegistrar.h"
+
+#include "EarlyHintPreloader.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/StaticPtr.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsXULAppAPI.h"
+
+namespace {
+mozilla::StaticRefPtr<mozilla::net::EarlyHintRegistrar> gSingleton;
+}  // namespace
+
+namespace mozilla::net {
+
+namespace {
+
+class EHShutdownObserver final : public nsIObserver {
+ public:
+  EHShutdownObserver() = default;
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+ private:
+  ~EHShutdownObserver() = default;
+};
+
+NS_IMPL_ISUPPORTS(EHShutdownObserver, nsIObserver)
+
+NS_IMETHODIMP
+EHShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic,
+                            const char16_t* aData) {
+  EarlyHintRegistrar::CleanUp();
+  return NS_OK;
+}
+
+}  // namespace
+
+EarlyHintRegistrar::EarlyHintRegistrar() {
+  // EarlyHintRegistrar is a main-thread-only object.
+  // All the operations should be run on main thread.
+  // It should be used on chrome process only.
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+EarlyHintRegistrar::~EarlyHintRegistrar() { MOZ_ASSERT(NS_IsMainThread()); }
+
+// static
+void EarlyHintRegistrar::CleanUp() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!gSingleton) {
+    return;
+  }
+
+  for (auto& preloader : gSingleton->mEarlyHint) {
+    if (auto p = preloader.GetData()) {
+      // Don't delete entry from EarlyHintPreloader, because that would
+      // invalidate the iterator.
+
+      p->CancelChannel(NS_ERROR_ABORT, "EarlyHintRegistrar::CleanUp"_ns,
+                       /* aDeleteEntry */ false);
+    }
+  }
+  gSingleton->mEarlyHint.Clear();
+}
+
+// static
+already_AddRefed<EarlyHintRegistrar> EarlyHintRegistrar::GetOrCreate() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!gSingleton) {
+    gSingleton = new EarlyHintRegistrar();
+    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+    if (NS_WARN_IF(!obs)) {
+      return nullptr;
+    }
+    nsCOMPtr<nsIObserver> observer = new EHShutdownObserver();
+    nsresult rv =
+        obs->AddObserver(observer, "profile-change-net-teardown", false);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return nullptr;
+    }
+    mozilla::ClearOnShutdown(&gSingleton);
+  }
+  return do_AddRef(gSingleton);
+}
+
+void EarlyHintRegistrar::DeleteEntry(uint64_t aEarlyHintPreloaderId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mEarlyHint.Remove(aEarlyHintPreloaderId);
+}
+
+void EarlyHintRegistrar::RegisterEarlyHint(uint64_t aEarlyHintPreloaderId,
+                                           EarlyHintPreloader* aEhp) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aEhp);
+
+  mEarlyHint.InsertOrUpdate(aEarlyHintPreloaderId, RefPtr{aEhp});
+}
+
+bool EarlyHintRegistrar::LinkParentChannel(uint64_t aEarlyHintPreloaderId,
+                                           nsIParentChannel* aParent,
+                                           uint64_t aChannelId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aParent);
+
+  RefPtr<EarlyHintPreloader> ehp;
+  bool found = mEarlyHint.Get(aEarlyHintPreloaderId, getter_AddRefs(ehp));
+  if (ehp) {
+    ehp->OnParentReady(aParent, aChannelId);
+  }
+  MOZ_ASSERT(ehp || !found);
+  return found;
+}
+
+}  // namespace mozilla::net