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// Copyright (c) 2006-2008 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/url_fetcher.h"
#include "chrome/common/notification_service.h"
class PrefService;
// This object is responsible for updating the Google URL at most once per run,
// and tracking the currently known value, which is also saved to a pref.
//
// Most consumers should only call GoogleURL(), which is guaranteed to
// synchronously return a value at all times (even during startup or in unittest
// mode). Consumers who need to be notified when things change should listen to
// the notification service for NOTIFY_GOOGLE_URL_UPDATED, and call GoogleURL()
// again after receiving it, in order to get the updated value.
//
// To protect users' privacy and reduce server load, no updates will be
// performed (ever) unless at least one consumer registers interest by calling
// RequestServerCheck().
class GoogleURLTracker : public URLFetcher::Delegate,
public NotificationObserver {
public:
// Only the main browser process loop should call this, when setting up
// g_browser_process->google_url_tracker_. No code other than the
// GoogleURLTracker itself should actually use
// g_browser_process->google_url_tracker() (which shouldn't be hard, since
// there aren't useful public functions on this object for consumers to access
// anyway).
GoogleURLTracker();
~GoogleURLTracker();
// Returns the current Google URL. This will return a valid URL even in
// unittest mode.
//
// This is the only function most code should ever call.
static GURL GoogleURL();
// Requests that the tracker perform a server check to update the Google URL
// as necessary. This will happen at most once per run, not sooner than five
// seconds after startup (checks requested before that time will occur then;
// checks requested afterwards will occur immediately, if no other checks have
// been made during this run).
//
// In unittest mode, this function does nothing.
static void RequestServerCheck();
static void RegisterPrefs(PrefService* prefs);
private:
FRIEND_TEST(GoogleURLTrackerTest, CheckAndConvertURL);
// Determines if |url| is an appropriate source for a new Google base URL, and
// update |base_url| to the appropriate base URL if so. Returns whether the
// check succeeded (and thus whether |base_url| was actually updated).
static bool CheckAndConvertToGoogleBaseURL(const GURL& url, GURL* base_url);
// Registers consumer interest in getting an updated URL from the server.
void SetNeedToFetch();
// Called when the five second startup sleep has finished. Runs any pending
// fetch.
void FinishSleep();
// Starts the fetch of the up-to-date Google URL if we actually want to fetch
// it and can currently do so.
void StartFetchIfDesirable();
// URLFetcher::Delegate
virtual void OnURLFetchComplete(const URLFetcher *source,
const GURL& url,
const URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data);
// NotificationObserver
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
static const char kDefaultGoogleHomepage[];
GURL google_url_;
ScopedRunnableMethodFactory<GoogleURLTracker> fetcher_factory_;
scoped_ptr<URLFetcher> fetcher_;
bool in_startup_sleep_; // True if we're in the five-second "no fetching"
// period that begins at browser start.
bool already_fetched_; // True if we've already fetched a URL once this run;
// we won't fetch again until after a restart.
bool need_to_fetch_; // True if a consumer actually wants us to fetch an
// updated URL. If this is never set, we won't
// bother to fetch anything.
bool request_context_available_;
// True when the profile has been loaded and the
// default request context created, so we can
// actually do the fetch with the right data.
DISALLOW_EVIL_CONSTRUCTORS(GoogleURLTracker);
};
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