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// Copyright 2013 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 "components/precache/content/precache_manager.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/metrics/field_trial.h"
#include "base/prefs/pref_service.h"
#include "base/time/time.h"
#include "components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h"
#include "components/precache/core/precache_database.h"
#include "components/precache/core/precache_switches.h"
#include "components/precache/core/url_list_provider.h"
#include "components/user_prefs/user_prefs.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/network_change_notifier.h"
using content::BrowserThread;
namespace {
const char kPrecacheFieldTrialName[] = "Precache";
const char kPrecacheFieldTrialEnabledGroup[] = "Enabled";
} // namespace
namespace precache {
PrecacheManager::PrecacheManager(content::BrowserContext* browser_context)
: browser_context_(browser_context),
precache_database_(new PrecacheDatabase()),
is_precaching_(false) {
base::FilePath db_path(browser_context_->GetPath().Append(
base::FilePath(FILE_PATH_LITERAL("PrecacheDatabase"))));
BrowserThread::PostTask(
BrowserThread::DB, FROM_HERE,
base::Bind(base::IgnoreResult(&PrecacheDatabase::Init),
precache_database_, db_path));
}
PrecacheManager::~PrecacheManager() {}
// static
bool PrecacheManager::IsPrecachingEnabled() {
return base::FieldTrialList::FindFullName(kPrecacheFieldTrialName) ==
kPrecacheFieldTrialEnabledGroup ||
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnablePrecache);
}
bool PrecacheManager::IsPrecachingAllowed() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
return user_prefs::UserPrefs::Get(browser_context_)->GetBoolean(
data_reduction_proxy::prefs::kDataReductionProxyEnabled);
}
void PrecacheManager::StartPrecaching(
const PrecacheCompletionCallback& precache_completion_callback,
URLListProvider* url_list_provider) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (is_precaching_) {
DLOG(WARNING) << "Cannot start precaching because precaching is already "
"in progress.";
return;
}
is_precaching_ = true;
BrowserThread::PostTask(
BrowserThread::DB, FROM_HERE,
base::Bind(&PrecacheDatabase::DeleteExpiredPrecacheHistory,
precache_database_, base::Time::Now()));
precache_completion_callback_ = precache_completion_callback;
url_list_provider->GetURLs(
base::Bind(&PrecacheManager::OnURLsReceived, AsWeakPtr()));
}
void PrecacheManager::CancelPrecaching() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!is_precaching_) {
// Do nothing if precaching is not in progress.
return;
}
is_precaching_ = false;
// Destroying the |precache_fetcher_| will cancel any fetch in progress.
precache_fetcher_.reset();
// Uninitialize the callback so that any scoped_refptrs in it are released.
precache_completion_callback_.Reset();
}
bool PrecacheManager::IsPrecaching() const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
return is_precaching_;
}
void PrecacheManager::RecordStatsForFetch(const GURL& url,
const base::Time& fetch_time,
int64 size,
bool was_cached) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (size == 0 || url.is_empty() || !url.SchemeIsHTTPOrHTTPS()) {
// Ignore empty responses, empty URLs, or URLs that aren't HTTP or HTTPS.
return;
}
if (is_precaching_) {
// Assume that precache is responsible for all requests made while
// precaching is currently in progress.
// TODO(sclittle): Make PrecacheFetcher explicitly mark precache-motivated
// fetches, and use that to determine whether or not a fetch was motivated
// by precaching.
BrowserThread::PostTask(
BrowserThread::DB, FROM_HERE,
base::Bind(&PrecacheDatabase::RecordURLPrecached, precache_database_,
url, fetch_time, size, was_cached));
} else {
bool is_connection_cellular =
net::NetworkChangeNotifier::IsConnectionCellular(
net::NetworkChangeNotifier::GetConnectionType());
BrowserThread::PostTask(
BrowserThread::DB, FROM_HERE,
base::Bind(&PrecacheDatabase::RecordURLFetched, precache_database_, url,
fetch_time, size, was_cached, is_connection_cellular));
}
}
void PrecacheManager::Shutdown() {
CancelPrecaching();
}
void PrecacheManager::OnDone() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// If OnDone has been called, then we should just be finishing precaching.
DCHECK(is_precaching_);
is_precaching_ = false;
precache_fetcher_.reset();
precache_completion_callback_.Run();
// Uninitialize the callback so that any scoped_refptrs in it are released.
precache_completion_callback_.Reset();
}
void PrecacheManager::OnURLsReceived(const std::list<GURL>& urls) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!is_precaching_) {
// Don't start precaching if it was canceled while waiting for the list of
// URLs.
return;
}
// Start precaching.
precache_fetcher_.reset(
new PrecacheFetcher(urls, browser_context_->GetRequestContext(), this));
precache_fetcher_->Start();
}
} // namespace precache
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