HTML MessagePort as mojo::MessagePipeHandle

content/child/webmessageportchannel_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_
 #define CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_
 
 #include <memory>
-#include <queue>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/strings/string16.h"
-#include "base/synchronization/lock.h"
-#include "ipc/ipc_listener.h"
+#include "content/common/message_port.h"
 #include "third_party/WebKit/public/platform/WebMessagePortChannel.h"
 
-namespace base {
-class SingleThreadTaskRunner;
-}
-
 namespace content {
 
 // This is thread safe.
-class WebMessagePortChannelImpl
-    : public blink::WebMessagePortChannel,
-      public IPC::Listener,
-      public base::RefCountedThreadSafe<WebMessagePortChannelImpl> {
+class WebMessagePortChannelImpl : public blink::WebMessagePortChannel {
  public:
-  explicit WebMessagePortChannelImpl(
-      const scoped_refptr<base::SingleThreadTaskRunner>&
-          main_thread_task_runner);
-  WebMessagePortChannelImpl(
-      int route_id,
-      int port_id,
-      const scoped_refptr<base::SingleThreadTaskRunner>&
-          main_thread_task_runner);
+  ~WebMessagePortChannelImpl() override;
+  explicit WebMessagePortChannelImpl(MessagePort message_port);
 
-  static void CreatePair(
-      const scoped_refptr<base::SingleThreadTaskRunner>&
-          main_thread_task_runner,
-      blink::WebMessagePortChannel** channel1,
-      blink::WebMessagePortChannel** channel2);
+  static void CreatePair(blink::WebMessagePortChannel** channel1,
+                         blink::WebMessagePortChannel** channel2);
 
-  // Extracts port IDs for passing on to the browser process, and queues any
-  // received messages.
-  static std::vector<int> ExtractMessagePortIDs(
-      std::unique_ptr<blink::WebMessagePortChannelArray> channels);
+  // Extracts MessagePorts for passing on to other processes.
+  static std::vector<MessagePort> ExtractMessagePorts(
+      blink::WebMessagePortChannelArray channels);
 
-  // Extracts port IDs for passing on to the browser process, and queues any
-  // received messages.
-  static std::vector<int> ExtractMessagePortIDs(
-      const blink::WebMessagePortChannelArray& channels);
+  // Creates WebMessagePortChannelImpl instances for MessagePorts passed in from
+  // other processes.
+  static blink::WebMessagePortChannelArray CreateFromMessagePorts(
+      const std::vector<MessagePort>& message_ports);
+  static blink::WebMessagePortChannelArray CreateFromMessagePipeHandles(
+      std::vector<mojo::ScopedMessagePipeHandle> handles);
 
-  // Extracts port IDs for passing on to the browser process, but doesn't
-  // send a separate IPC to the browser to initiate queueing messages. Instead
-  // calling code is responsible for initiating the queueing in the browser
-  // process. This is useful when transfering ports over an IPC channel that
-  // does not share ordering guarentees with regular IPC.
-  static std::vector<int>
-  ExtractMessagePortIDsWithoutQueueing(
-      std::unique_ptr<blink::WebMessagePortChannelArray> channels);
-
-  // Creates WebMessagePortChannelImpl instances for port IDs passed in from the
-  // browser process.
-  static blink::WebMessagePortChannelArray CreatePorts(
-      const std::vector<int>& message_ports,
-      const std::vector<int>& new_routing_ids,
-      const scoped_refptr<base::SingleThreadTaskRunner>&
-          main_thread_task_runner);
-
-  // Queues received and incoming messages until there are no more in-flight
-  // messages, then sends all of them to the browser process.
-  void QueueMessages();
-  int message_port_id() const { return message_port_id_; }
+  MessagePort ReleaseMessagePort();
 
  private:
-  friend class base::RefCountedThreadSafe<WebMessagePortChannelImpl>;
-  ~WebMessagePortChannelImpl() override;
+  explicit WebMessagePortChannelImpl(mojo::ScopedMessagePipeHandle handle);
 
   // WebMessagePortChannel implementation.
   void setClient(blink::WebMessagePortChannelClient* client) override;
-  void destroy() override;
-  void postMessage(const blink::WebString& message,
-                   blink::WebMessagePortChannelArray* channels_ptr) override;
-  bool tryGetMessage(blink::WebString* message,
+  void postMessage(const blink::WebString& encoded_message,
+                   blink::WebMessagePortChannelArray channels) override;
+  bool tryGetMessage(blink::WebString* encoded_message,
                      blink::WebMessagePortChannelArray& channels) override;
 
-  void Init();
-  void Entangle(scoped_refptr<WebMessagePortChannelImpl> channel);
-  void Send(IPC::Message* message);
-  void SendPostMessage(
-      const base::string16& message,
-      std::unique_ptr<blink::WebMessagePortChannelArray> channels);
-
-  // IPC::Listener implementation.
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  void OnMessage(const base::string16& message,
-                 const std::vector<int>& sent_message_ports,
-                 const std::vector<int>& new_routing_ids);
-  void OnMessagesQueued();
-
-  struct Message {
-    Message();
-    Message(const Message& other);
-    ~Message();
-
-    base::string16 message;
-    blink::WebMessagePortChannelArray ports;
-  };
-
-  typedef std::queue<Message> MessageQueue;
-  MessageQueue message_queue_;
-
-  blink::WebMessagePortChannelClient* client_;
-  base::Lock lock_;  // Locks access to above.
-
-  int route_id_;  // The routing id for this object.
-  int message_port_id_;  // A globally unique identifier for this message port.
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
+  MessagePort port_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMessagePortChannelImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBMESSAGEPORTCHANNEL_IMPL_H_