1 files changed, 112 insertions, 0 deletions
diff --git a/ipc/glue/MessageLink.h b/ipc/glue/MessageLink.h
new file mode 100644
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+++ b/ipc/glue/MessageLink.h
@@ -0,0 +1,112 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* 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 ipc_glue_MessageLink_h
+#define ipc_glue_MessageLink_h 1
+
+#include <cstdint>
+#include "base/message_loop.h"
+#include "mojo/core/ports/node.h"
+#include "mojo/core/ports/port_ref.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/ipc/ScopedPort.h"
+
+namespace IPC {
+class Message;
+class MessageReader;
+class MessageWriter;
+}  // namespace IPC
+
+namespace mozilla {
+namespace ipc {
+
+class MessageChannel;
+class NodeController;
+
+struct HasResultCodes {
+  enum Result {
+    MsgProcessed,
+    MsgDropped,
+    MsgNotKnown,
+    MsgNotAllowed,
+    MsgPayloadError,
+    MsgProcessingError,
+    MsgRouteError,
+    MsgValueError
+  };
+};
+
+enum Side : uint8_t { ParentSide, ChildSide, UnknownSide };
+
+class MessageLink {
+ public:
+  typedef IPC::Message Message;
+
+  explicit MessageLink(MessageChannel* aChan);
+  virtual ~MessageLink();
+
+  // n.b.: These methods all require that the channel monitor is
+  // held when they are invoked.
+  virtual void SendMessage(mozilla::UniquePtr<Message> msg) = 0;
+
+  // Synchronously close the connection, such that no further notifications will
+  // be delivered to the MessageChannel instance. Must be called with the
+  // channel monitor held.
+  virtual void Close() = 0;
+
+  virtual bool IsClosed() const = 0;
+
+#ifdef FUZZING_SNAPSHOT
+  virtual Maybe<mojo::core::ports::PortName> GetPortName() { return Nothing(); }
+#endif
+
+ protected:
+  MessageChannel* mChan;
+};
+
+class PortLink final : public MessageLink {
+  using PortRef = mojo::core::ports::PortRef;
+  using PortStatus = mojo::core::ports::PortStatus;
+  using UserMessage = mojo::core::ports::UserMessage;
+  using UserMessageEvent = mojo::core::ports::UserMessageEvent;
+
+ public:
+  PortLink(MessageChannel* aChan, ScopedPort aPort);
+  virtual ~PortLink();
+
+  void SendMessage(UniquePtr<Message> aMessage) override;
+  void Close() override;
+
+  bool IsClosed() const override;
+
+#ifdef FUZZING_SNAPSHOT
+  Maybe<mojo::core::ports::PortName> GetPortName() override {
+    return Some(mPort.name());
+  }
+#endif
+
+ private:
+  class PortObserverThunk;
+  friend class PortObserverThunk;
+
+  void OnPortStatusChanged();
+
+  // Called either when an error is detected on the port from the port observer,
+  // or when `SendClose()` is called.
+  void Clear();
+
+  const RefPtr<NodeController> mNode;
+  const PortRef mPort;
+
+  RefPtr<PortObserverThunk> mObserver;
+};
+
+}  // namespace ipc
+}  // namespace mozilla
+
+#endif  // ifndef ipc_glue_MessageLink_h