Native Messaging!

chrome/browser/extensions/api/messaging/extension_message_port.cc

+// 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.
+
+#include "chrome/browser/extensions/api/messaging/extension_message_port.h"
+
+#include "chrome/browser/extensions/extension_host.h"
+#include "chrome/browser/extensions/extension_process_manager.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/extensions/extension_messages.h"
+#include "content/public/browser/render_process_host.h"
+
+namespace extensions {
+
+ExtensionMessagePort::ExtensionMessagePort(content::RenderProcessHost* process,
+                                           int routing_id,
+                                           const std::string& extension_id)
+     : process_(process),
+       routing_id_(routing_id),
+       extension_id_(extension_id),
+       background_host_ptr_(NULL) {
+}
+
+void ExtensionMessagePort::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) {
+  process_->Send(new ExtensionMsg_DispatchOnConnect(
+      routing_id_, dest_port_id, channel_name,
+      tab_json, source_extension_id, target_extension_id));
+}
+
+void ExtensionMessagePort::DispatchOnDisconnect(int source_port_id,
+                                                bool connection_error) {
+  process_->Send(new ExtensionMsg_DispatchOnDisconnect(
+      routing_id_, source_port_id, connection_error));
+}
+
+void ExtensionMessagePort::DispatchOnMessage(const std::string& message,
+                                             int target_port_id) {
+    process_->Send(new ExtensionMsg_DeliverMessage(
+        routing_id_, target_port_id, message));
+}
+
+void ExtensionMessagePort::IncrementLazyKeepaliveCount() {
+  Profile* profile =
+      Profile::FromBrowserContext(process_->GetBrowserContext());
+  ExtensionProcessManager* pm =
+      ExtensionSystem::Get(profile)->process_manager();
+  ExtensionHost* host = pm->GetBackgroundHostForExtension(extension_id_);
+  if (host && host->extension()->has_lazy_background_page())
+    pm->IncrementLazyKeepaliveCount(host->extension());
+
+  // Keep track of the background host, so when we decrement, we only do so if
+  // the host hasn't reloaded.
+  background_host_ptr_ = host;
+}
+
+void ExtensionMessagePort::DecrementLazyKeepaliveCount() {
+  Profile* profile =
+      Profile::FromBrowserContext(process_->GetBrowserContext());
+  ExtensionProcessManager* pm =
+      ExtensionSystem::Get(profile)->process_manager();
+  ExtensionHost* host = pm->GetBackgroundHostForExtension(extension_id_);
+  if (host && host == background_host_ptr_)
+    pm->DecrementLazyKeepaliveCount(host->extension());
+}
+
+}  // namespace extensions