[fsp] Introduce chrome://fsp-internals for logging and debugging.

chrome/browser/ui/webui/chromeos/fsp_internals_ui.cc

+// Copyright 2014 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/ui/webui/chromeos/fsp_internals_ui.h"
+
+#include "base/bind.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
+#include "chrome/browser/chromeos/file_system_provider/request_manager.h"
+#include "chrome/browser/chromeos/file_system_provider/service.h"
+#include "chrome/browser/chromeos/file_system_provider/service_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "grit/browser_resources.h"
+
+using content::BrowserThread;
+
+namespace chromeos {
+
+namespace {
+
+// Class to handle messages from chrome://fsp-internals.
+class FSPInternalsWebUIHandler : public content::WebUIMessageHandler {
+ public:
+  FSPInternalsWebUIHandler() : weak_ptr_factory_(this) {}
+
+  virtual ~FSPInternalsWebUIHandler() {}
+
+ private:
+  // content::WebUIMessageHandler overrides.
+  virtual void RegisterMessages() OVERRIDE;
+
+  // Gets a file system provider service for the current profile. If not found,
+  // then NULL.
+  file_system_provider::Service* GetService();
+
+  // Invoked when updating file system list is requested.
+  void OnUpdateFileSystems(const base::ListValue* args);
+
+  base::WeakPtrFactory<FSPInternalsWebUIHandler> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FSPInternalsWebUIHandler);
+};
+
+void FSPInternalsWebUIHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "updateFileSystems",
+      base::Bind(&FSPInternalsWebUIHandler::OnUpdateFileSystems,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+file_system_provider::Service* FSPInternalsWebUIHandler::GetService() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  Profile* const profile = Profile::FromWebUI(web_ui());
+  return file_system_provider::ServiceFactory::FindExisting(profile);
+}
+
+void FSPInternalsWebUIHandler::OnUpdateFileSystems(
+    const base::ListValue* args) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  file_system_provider::Service* const service = GetService();
+  if (!service)
+    return;
+
+  base::ListValue items;
+
+  const std::vector<file_system_provider::ProvidedFileSystemInfo>
+      file_system_info_list = service->GetProvidedFileSystemInfoList();
+
+  for (size_t i = 0; i < file_system_info_list.size(); ++i) {
+    const file_system_provider::ProvidedFileSystemInfo file_system_info =
+        file_system_info_list[i];
+
+    file_system_provider::ProvidedFileSystemInterface* const file_system =
+        service->GetProvidedFileSystem(file_system_info.extension_id(),
+                                       file_system_info.file_system_id());
+    DCHECK(file_system);
+
+    file_system_provider::RequestManager* const request_manager =
+        file_system->GetRequestManager();
+    DCHECK(request_manager);
+
+    base::DictionaryValue* item_value = new base::DictionaryValue();
+    item_value->SetString("id", file_system_info.file_system_id());
+    item_value->SetString("name", file_system_info.file_system_name());
+    item_value->SetString("extensionId", file_system_info.extension_id());
+    item_value->SetString("mountPath",
+                          file_system_info.mount_path().AsUTF8Unsafe());
+    item_value->SetInteger("activeRequests",
+                           request_manager->GetActiveRequestsForLogging());
+
+    items.Append(item_value);
+  }
+
+  web_ui()->CallJavascriptFunction("updateFileSystems", items);
+}
+
+}  // namespace
+
+FSPInternalsUI::FSPInternalsUI(content::WebUI* web_ui)
+    : WebUIController(web_ui) {
+  web_ui->AddMessageHandler(new FSPInternalsWebUIHandler());
+
+  content::WebUIDataSource* source =
+      content::WebUIDataSource::Create(chrome::kChromeUIFSPInternalsHost);
+  source->AddResourcePath("fsp_internals.css", IDR_FSP_INTERNALS_CSS);
+  source->AddResourcePath("fsp_internals.js", IDR_FSP_INTERNALS_JS);
+  source->SetDefaultResource(IDR_FSP_INTERNALS_HTML);
+
+  Profile* profile = Profile::FromWebUI(web_ui);
+  content::WebUIDataSource::Add(profile, source);
+}
+
+}  // namespace chromeos