Native Messaging!

chrome/browser/extensions/message_port.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 CHROME_BROWSER_EXTENSIONS_MESSAGE_PORT_H_
+#define CHROME_BROWSER_EXTENSIONS_MESSAGE_PORT_H_
+
+#include "chrome/browser/extensions/message_service.h"

[Aaron Boodman, 2012/08/15 03:39:21]

Pull all of the messaging-related classes into c/b/e/api/messaging/*? Might want
to do that first as a purely mechanical change prior to this one.

[eaugusti, 2012/08/21 23:08:34]

Done.

+
+namespace content {
+class RenderProcessHost;
+}  // namespace content
+
+namespace extensions {
+class NativeMessageProcess;
+class ExtensionMessagePort;
+class NativeMessagePort;
+
+// One side of the communication handled by extensions::MessageService.
+class MessagePort {

[Aaron Boodman, 2012/08/15 03:39:21]

Also, I think it would be nicer to define this as a member of MessageService,
then have separate files for the two different implementations.

[eaugusti, 2012/08/21 23:08:34]

Done.

+ public:
+  virtual ~MessagePort() {}
+  virtual void DispatchOnConnect(int dest_port_id,
+                                 const std::string& channel_name,
+                                 const std::string& tab_json,
+                                 const std::string& source_extension_id,
+                                 const std::string& target_extension_id) {}
+  virtual void DispatchOnDisconnect(int source_port_id,
+                                    bool connection_error) {}
+  virtual void DispatchOnMessage(const std::string& message,
+                                 int target_port_id) = 0;
+  virtual void IncrementLazyKeepaliveCount() {}
+  virtual void DecrementLazyKeepaliveCount() {}
+  virtual bool IsNative() { return false; }

[Aaron Boodman, 2012/08/15 03:39:21]

Ghetto-RTTI :(. It's better to tell the object what to do and rely on
polymorphism to have the right thing happen, rather than ask the object its type
and then do something based on that.

[eaugusti, 2012/08/21 23:08:34]

Done.

+  ExtensionMessagePort* AsExtensionMessagePort();
+  NativeMessagePort* AsNativeMessagePort();
+
+ protected:
+  MessagePort() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MessagePort);
+};
+
+// A port that manages communication with an extension.
+class ExtensionMessagePort : public MessagePort {
+ public:
+  ExtensionMessagePort(content::RenderProcessHost* process,
+                       int routing_id,
+                       const std::string& extension_id);
+  virtual void DispatchOnConnect(
+      int dest_port_id,
+      const std::string& channel_name,
+      const std::string& tab_json,
+      const std::string& source_extension_id,
+      const std::string& target_extension_id) OVERRIDE;
+  virtual void DispatchOnDisconnect(int source_port_id,
+                                    bool connection_error) OVERRIDE;
+  virtual void DispatchOnMessage(const std::string& message,
+                                 int target_port_id) OVERRIDE;
+  virtual void IncrementLazyKeepaliveCount() OVERRIDE;
+  virtual void DecrementLazyKeepaliveCount() OVERRIDE;
+  content::RenderProcessHost* process() { return process_; }
+
+ private:
+  content::RenderProcessHost* process_;
+  int routing_id_;
+  std::string extension_id_;
+  void* background_host_ptr_;  // used in IncrementLazyKeepaliveCount
+};
+
+// A port that manages communication with a native application.
+class NativeMessagePort : public MessagePort {
+ public:
+  // Takes ownership of |native_process|.
+  explicit NativeMessagePort(NativeMessageProcess* native_process);
+  virtual ~NativeMessagePort();
+  virtual void DispatchOnMessage(const std::string& message,
+                                 int target_port_id) OVERRIDE;
+  virtual bool IsNative() { return true; } OVERRIDE
+
+ private:
+  NativeMessageProcess* native_process_;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_MESSAGE_PORT_H_