Refactoring the SysInfoProvider.

chrome/browser/chromeos/system/sysinfo_provider.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/chromeos/system/sysinfo_provider.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/command_line.h"
-#include "base/file_path.h"
-#include "base/file_util.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/string_util.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/threading/thread.h"
-#include "chrome/browser/memory_details.h"
-#include "chrome/common/chrome_switches.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
-#include "chromeos/dbus/debug_daemon_client.h"
-#include "content/public/browser/browser_thread.h"
-
-using content::BrowserThread;
-
-namespace chromeos {
-namespace system {
-
-// Fetches logs from the debug daemon over DBus. When all the logs have been
-// fetched, forwards the results to the supplied Request. Used like:
-//   DebugDaemonLogFetcher* fetcher = new DebugDaemonLogFetcher(request);
-//   fetcher->Fetch();
-// Note that you do not need to delete the fetcher; it will delete itself after
-// Fetch() has forwarded the result to the request handler.
-class DebugDaemonLogFetcher {
- public:
-  typedef
-      scoped_refptr<CancelableRequest<SysInfoProvider::FetchCompleteCallback> >
-      Request;
-
-  explicit DebugDaemonLogFetcher(Request request);
-  ~DebugDaemonLogFetcher();
-
-  // Fetches logs from the daemon over dbus. After the fetch is complete, the
-  // results will be forwarded to the request supplied to the constructor and
-  // this instance will free itself.
-  void Fetch();
- private:
-  // Callbacks
-  void GotRoutes(bool succeeded, const std::vector<std::string>& routes);
-  void GotNetworkStatus(bool succeeded, const std::string& status);
-  void GotModemStatus(bool succeeded, const std::string& status);
-  void GotLogs(bool succeeded, const std::map<std::string, std::string>& logs);
-  void RequestCompleted();
-
-  SysInfoResponse* response_;
-  Request request_;
-  int pending_requests_;
-  base::WeakPtrFactory<DebugDaemonLogFetcher> weak_ptr_factory_;
-};
-
-DebugDaemonLogFetcher::DebugDaemonLogFetcher(Request request)
-    : response_(new SysInfoResponse()), request_(request),
-      weak_ptr_factory_(this) { }
-
-DebugDaemonLogFetcher::~DebugDaemonLogFetcher() { }
-
-void DebugDaemonLogFetcher::Fetch() {
-  DebugDaemonClient* client = DBusThreadManager::Get()->GetDebugDaemonClient();
-  pending_requests_ = 4;
-  // Note that this use of base::Unretained(this) is safe, since |this| is
-  // deleted in RequestCompleted if and only if all outstanding callbacks are
-  // done.
-  client->GetRoutes(true, false,
-      base::Bind(&DebugDaemonLogFetcher::GotRoutes,
-                 weak_ptr_factory_.GetWeakPtr()));
-  client->GetNetworkStatus(
-      base::Bind(&DebugDaemonLogFetcher::GotNetworkStatus,
-                 weak_ptr_factory_.GetWeakPtr()));
-  client->GetModemStatus(
-      base::Bind(&DebugDaemonLogFetcher::GotModemStatus,
-                 weak_ptr_factory_.GetWeakPtr()));
-  client->GetAllLogs(
-      base::Bind(&DebugDaemonLogFetcher::GotLogs,
-                 weak_ptr_factory_.GetWeakPtr()));
-}
-
-const char *kNotAvailable = "<not available>";
-
-void DebugDaemonLogFetcher::GotRoutes(bool succeeded,
-                                      const std::vector<std::string>& routes) {
-  if (succeeded)
-    (*response_)["routes"] = JoinString(routes, '\n');
-  else
-    (*response_)["routes"] = kNotAvailable;
-  RequestCompleted();
-}
-
-void DebugDaemonLogFetcher::GotNetworkStatus(bool succeeded,
-                                             const std::string& status) {
-  if (succeeded)
-    (*response_)["network-status"] = status;
-  else
-    (*response_)["network-status"] = kNotAvailable;
-  RequestCompleted();
-}
-
-void DebugDaemonLogFetcher::GotModemStatus(bool succeeded,
-                                           const std::string& status) {
-  if (succeeded)
-    (*response_)["modem-status"] = status;
-  else
-    (*response_)["modem-status"] = kNotAvailable;
-  RequestCompleted();
-}
-
-void DebugDaemonLogFetcher::GotLogs(bool /* succeeded */,
-                                    const std::map<std::string,
-                                                   std::string>& logs) {
-  // We ignore 'succeeded' for this callback - we want to display as much of the
-  // debug info as we can even if we failed partway through parsing, and if we
-  // couldn't fetch any of it, none of the fields will even appear.
-  for (std::map<std::string, std::string>::const_iterator it = logs.begin();
-       it != logs.end(); ++it)
-    (*response_)[it->first] = it->second;
-  RequestCompleted();
-}
-
-void DebugDaemonLogFetcher::RequestCompleted() {
-  if (--pending_requests_)
-    return;
-  request_->ForwardResult(response_);
-  BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, this);
-}
-
-class SysInfoProviderImpl : public SysInfoProvider {
- public:
-  virtual Handle Fetch(CancelableRequestConsumerBase* consumer,
-                       const FetchCompleteCallback& callback);
-};
-
-CancelableRequestProvider::Handle SysInfoProviderImpl::Fetch(
-    CancelableRequestConsumerBase* consumer,
-    const FetchCompleteCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  scoped_refptr<CancelableRequest<FetchCompleteCallback> >
-      request(new CancelableRequest<FetchCompleteCallback>(callback));
-  AddRequest(request, consumer);
-  // Deleted by DebugDaemonLogFetcher::RequestCompleted()
-  DebugDaemonLogFetcher* fetcher = new DebugDaemonLogFetcher(request);
-  fetcher->Fetch();
-
-  return request->handle();
-}
-
-SysInfoProvider* SysInfoProvider::Create() {
-  return new SysInfoProviderImpl();
-}
-
-} // namespace system
-} // namespace chromeos