1 files changed, 63 insertions, 0 deletions
diff --git a/dom/gamepad/ipc/GamepadEventChannelChild.cpp b/dom/gamepad/ipc/GamepadEventChannelChild.cpp
new file mode 100644
index 0000000000..9d1a07a662
--- /dev/null
+++ b/dom/gamepad/ipc/GamepadEventChannelChild.cpp
@@ -0,0 +1,63 @@
+/* -*- 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 "GamepadEventChannelChild.h"
+#include "mozilla/dom/GamepadManager.h"
+#include "mozilla/dom/Promise.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class GamepadUpdateRunnable final : public Runnable {
+ public:
+  explicit GamepadUpdateRunnable(const GamepadChangeEvent& aGamepadEvent)
+      : Runnable("dom::GamepadUpdateRunnable"), mEvent(aGamepadEvent) {}
+  NS_IMETHOD Run() override {
+    RefPtr<GamepadManager> svc(GamepadManager::GetService());
+    if (svc) {
+      svc->Update(mEvent);
+    }
+    return NS_OK;
+  }
+
+ protected:
+  GamepadChangeEvent mEvent;
+};
+
+}  // namespace
+
+already_AddRefed<GamepadEventChannelChild> GamepadEventChannelChild::Create() {
+  return RefPtr<GamepadEventChannelChild>(new GamepadEventChannelChild())
+      .forget();
+}
+
+mozilla::ipc::IPCResult GamepadEventChannelChild::RecvGamepadUpdate(
+    const GamepadChangeEvent& aGamepadEvent) {
+  DebugOnly<nsresult> rv =
+      NS_DispatchToMainThread(new GamepadUpdateRunnable(aGamepadEvent));
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread failed");
+  return IPC_OK();
+}
+
+void GamepadEventChannelChild::AddPromise(const uint32_t& aID,
+                                          dom::Promise* aPromise) {
+  MOZ_ASSERT(!mPromiseList.Get(aID, nullptr));
+  mPromiseList.Put(aID, RefPtr{aPromise});
+}
+
+mozilla::ipc::IPCResult GamepadEventChannelChild::RecvReplyGamepadPromise(
+    const uint32_t& aPromiseID) {
+  RefPtr<dom::Promise> p;
+  if (!mPromiseList.Get(aPromiseID, getter_AddRefs(p))) {
+    MOZ_CRASH("We should always have a promise.");
+  }
+
+  p->MaybeResolve(true);
+  mPromiseList.Remove(aPromiseID);
+  return IPC_OK();
+}
+
+}  // namespace mozilla::dom