Refactor OAuth2TokenService to have profile- and device-based implementations.

chrome/browser/signin/oauth2_token_service_request.cc

-// Copyright 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/signin/oauth2_token_service_request.h"
-
-#include "base/bind.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/signin/oauth2_token_service.h"
-#include "chrome/browser/signin/oauth2_token_service_factory.h"
-#include "content/public/browser/browser_thread.h"
-#include "google_apis/gaia/google_service_auth_error.h"
-#include "google_apis/gaia/oauth2_access_token_consumer.h"
-
-class OAuth2TokenServiceRequest::Core
-    : public base::RefCountedThreadSafe<OAuth2TokenServiceRequest::Core>,
-      public OAuth2TokenService::Consumer {
- public:
-  // Note the thread where an instance of Core is constructed is referred to as
-  // the "owner thread" here. This will be the thread of |owner_task_runner_|.
-  Core(Profile* profile,
-       OAuth2TokenServiceRequest* owner);
-  // Starts fetching an OAuth2 access token for |scopes|. It should be called
-  // on the owner thread.
-  void Start(const OAuth2TokenService::ScopeSet& scopes);
-  // Stops the OAuth2 access token fetching. It should be called on the owner
-  // thread.
-  void Stop();
-
-  // OAuth2TokenService::Consumer. It should be called on the UI thread.
-  virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
-                                 const std::string& access_token,
-                                 const base::Time& expiration_time) OVERRIDE;
-  virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
-                                 const GoogleServiceAuthError& error) OVERRIDE;
-
- private:
-  friend class base::RefCountedThreadSafe<OAuth2TokenServiceRequest::Core>;
-
-  // Note this can be destructed on the owner thread or on the UI thread,
-  // depending on the reference count.
-  virtual ~Core();
-
-  // Starts an OAuth2TokenService::Request on the UI thread.
-  void StartOnUIThread(OAuth2TokenService::ScopeSet scopes);
-  // Stops the OAuth2TokenService::Request on the UI thread.
-  void StopOnUIThread();
-
-  // Method posted to the owner thread to call back |owner_|. Note when this
-  // posted task is actually running on the owner thread, it is possible that
-  // |owner_| has been reset NULL.
-  void InformOwnerOnGetTokenSuccess(std::string access_token,
-                                    base::Time expiration_time);
-  void InformOwnerOnGetTokenFailure(GoogleServiceAuthError error);
-
-  // The profile with which this instance was initialized.
-  Profile* const profile_;
-
-  // The object to call back when fetching completes. |owner_| should be
-  // called back only on the owner thread.
-  OAuth2TokenServiceRequest* owner_;
-  // Task runner on which |owner_| should be called back.
-  scoped_refptr<base::SingleThreadTaskRunner> owner_task_runner_;
-
-  // OAuth2TokenService request for fetching OAuth2 access token; it should be
-  // created, reset and accessed only on the UI thread.
-  scoped_ptr<OAuth2TokenService::Request> request_;
-
-  DISALLOW_COPY_AND_ASSIGN(Core);
-};
-
-OAuth2TokenServiceRequest::Core::Core(
-    Profile* profile,
-    OAuth2TokenServiceRequest* owner)
-    : profile_(profile),
-      owner_(owner),
-      owner_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
-  DCHECK(profile);
-  DCHECK(owner);
-}
-
-OAuth2TokenServiceRequest::Core::~Core() {
-}
-
-void OAuth2TokenServiceRequest::Core::Start(
-    const OAuth2TokenService::ScopeSet& scopes) {
-  DCHECK(owner_task_runner_->BelongsToCurrentThread());
-
-  if (content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
-    StartOnUIThread(scopes);
-  } else {
-    content::BrowserThread::PostTask(
-        content::BrowserThread::UI,
-        FROM_HERE,
-        base::Bind(&OAuth2TokenServiceRequest::Core::StartOnUIThread,
-                   this, scopes));
-  }
-}
-
-void OAuth2TokenServiceRequest::Core::Stop() {
-  DCHECK(owner_task_runner_->BelongsToCurrentThread());
-
-  // Detaches |owner_| from this instance so |owner_| will be called back only
-  // if |Stop()| has never been called.
-  owner_ = NULL;
-  if (content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
-    StopOnUIThread();
-  } else {
-    content::BrowserThread::PostTask(
-        content::BrowserThread::UI,
-        FROM_HERE,
-        base::Bind(&OAuth2TokenServiceRequest::Core::StopOnUIThread, this));
-  }
-}
-
-void OAuth2TokenServiceRequest::Core::StopOnUIThread() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  request_.reset();
-}
-
-void OAuth2TokenServiceRequest::Core::StartOnUIThread(
-    OAuth2TokenService::ScopeSet scopes) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-
-  OAuth2TokenService* service = OAuth2TokenServiceFactory::GetForProfile(
-      profile_);
-  DCHECK(service);
-  request_.reset(service->StartRequest(scopes, this).release());
-}
-
-void OAuth2TokenServiceRequest::Core::OnGetTokenSuccess(
-    const OAuth2TokenService::Request* request,
-    const std::string& access_token,
-    const base::Time& expiration_time) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  DCHECK_EQ(request_.get(), request);
-  owner_task_runner_->PostTask(FROM_HERE, base::Bind(
-      &OAuth2TokenServiceRequest::Core::InformOwnerOnGetTokenSuccess, this,
-      access_token, expiration_time));
-  request_.reset();
-}
-
-void OAuth2TokenServiceRequest::Core::OnGetTokenFailure(
-    const OAuth2TokenService::Request* request,
-    const GoogleServiceAuthError& error) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  DCHECK_EQ(request_.get(), request);
-  owner_task_runner_->PostTask(FROM_HERE, base::Bind(
-      &OAuth2TokenServiceRequest::Core::InformOwnerOnGetTokenFailure, this,
-      error));
-  request_.reset();
-}
-
-void OAuth2TokenServiceRequest::Core::InformOwnerOnGetTokenSuccess(
-    std::string access_token,
-    base::Time expiration_time) {
-  DCHECK(owner_task_runner_->BelongsToCurrentThread());
-
-  if (owner_)
-    owner_->consumer_->OnGetTokenSuccess(owner_, access_token, expiration_time);
-}
-
-void OAuth2TokenServiceRequest::Core::InformOwnerOnGetTokenFailure(
-    GoogleServiceAuthError error) {
-  DCHECK(owner_task_runner_->BelongsToCurrentThread());
-
-  if (owner_)
-    owner_->consumer_->OnGetTokenFailure(owner_, error);
-}
-
-// static
-OAuth2TokenServiceRequest* OAuth2TokenServiceRequest::CreateAndStart(
-    Profile* profile,
-    const OAuth2TokenService::ScopeSet& scopes,
-    OAuth2TokenService::Consumer* consumer) {
-  return new OAuth2TokenServiceRequest(profile, scopes, consumer);
-}
-
-OAuth2TokenServiceRequest::OAuth2TokenServiceRequest(
-    Profile* profile,
-    const OAuth2TokenService::ScopeSet& scopes,
-    OAuth2TokenService::Consumer* consumer)
-    : consumer_(consumer),
-      core_(new Core(profile, this)) {
-  core_->Start(scopes);
-}
-
-OAuth2TokenServiceRequest::~OAuth2TokenServiceRequest() {
-  DCHECK(CalledOnValidThread());
-  core_->Stop();
-}