1 files changed, 62 insertions, 0 deletions
diff --git a/netwerk/dns/DNSListenerProxy.h b/netwerk/dns/DNSListenerProxy.h
new file mode 100644
index 0000000000..5baddfd8e7
--- /dev/null
+++ b/netwerk/dns/DNSListenerProxy.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et 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/. */
+
+#ifndef DNSListenerProxy_h__
+#define DNSListenerProxy_h__
+
+#include "nsIDNSListener.h"
+#include "nsIDNSRecord.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+
+class nsIEventTarget;
+class nsICancelable;
+
+namespace mozilla {
+namespace net {
+
+#define DNS_LISTENER_PROXY_IID                       \
+  {                                                  \
+    0x8f172ca3, 0x7a7f, 0x4941, {                    \
+      0xa7, 0x0b, 0xbc, 0x72, 0x80, 0x2e, 0x9d, 0x9b \
+    }                                                \
+  }
+
+class DNSListenerProxy final : public nsIDNSListener {
+ public:
+  DNSListenerProxy(nsIDNSListener* aListener, nsIEventTarget* aTargetThread)
+      // We want to make sure that |aListener| is only accessed on the target
+      // thread.
+      : mListener(aListener),
+        mTargetThread(aTargetThread),
+        mListenerAddress(reinterpret_cast<uintptr_t>(aListener)) {
+    MOZ_ASSERT(mListener);
+    MOZ_ASSERT(mTargetThread);
+  }
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIDNSLISTENER
+  NS_DECLARE_STATIC_IID_ACCESSOR(DNS_LISTENER_PROXY_IID)
+
+  uintptr_t GetOriginalListenerAddress() const { return mListenerAddress; }
+
+ private:
+  ~DNSListenerProxy() {
+    NS_ProxyRelease("DNSListenerProxy::mListener", mTargetThread,
+                    mListener.forget());
+  }
+
+  nsCOMPtr<nsIDNSListener> mListener;
+  nsCOMPtr<nsIEventTarget> mTargetThread;
+  uintptr_t mListenerAddress;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(DNSListenerProxy, DNS_LISTENER_PROXY_IID)
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // DNSListenerProxy_h__