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// 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/extensions/updater/extension_cache_impl.h"
#include "base/bind.h"
#include "base/memory/singleton.h"
#include "base/metrics/histogram.h"
#include "base/sequenced_task_runner.h"
#include "base/stl_util.h"
#include "base/threading/sequenced_worker_pool.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/extensions/crx_installer.h"
#include "chrome/browser/extensions/updater/local_extension_cache.h"
#include "chrome/common/extensions/extension_constants.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "extensions/browser/install/crx_install_error.h"
namespace extensions {
namespace {
#if defined(OS_CHROMEOS)
const char kLocalCacheDir[] = "/var/cache/external_cache";
#else
#error Please define kLocalCacheDir suitable for target OS
#endif// Directory where the extensions are cached.
// Maximum size of local cache on disk.
size_t kMaxCacheSize = 256 * 1024 * 1024;
// Maximum age of unused extensions in cache.
const int kMaxCacheAgeDays = 30;
} // namespace
ExtensionCacheImpl::ExtensionCacheImpl()
: cache_(new LocalExtensionCache(base::FilePath(kLocalCacheDir),
kMaxCacheSize,
base::TimeDelta::FromDays(kMaxCacheAgeDays),
content::BrowserThread::GetBlockingPool()->
GetSequencedTaskRunnerWithShutdownBehavior(
content::BrowserThread::GetBlockingPool()->GetSequenceToken(),
base::SequencedWorkerPool::SKIP_ON_SHUTDOWN))),
weak_ptr_factory_(this) {
notification_registrar_.Add(
this,
extensions::NOTIFICATION_EXTENSION_INSTALL_ERROR,
content::NotificationService::AllBrowserContextsAndSources());
cache_->Init(true, base::Bind(&ExtensionCacheImpl::OnCacheInitialized,
weak_ptr_factory_.GetWeakPtr()));
}
ExtensionCacheImpl::ExtensionCacheImpl(const base::FilePath& local_cache_dir)
: cache_(new LocalExtensionCache(
base::FilePath(local_cache_dir),
kMaxCacheSize,
base::TimeDelta::FromDays(kMaxCacheAgeDays),
content::BrowserThread::GetBlockingPool()
->GetSequencedTaskRunnerWithShutdownBehavior(
content::BrowserThread::GetBlockingPool()->GetSequenceToken(),
base::SequencedWorkerPool::SKIP_ON_SHUTDOWN))),
weak_ptr_factory_(this) {
notification_registrar_.Add(
this, extensions::NOTIFICATION_EXTENSION_INSTALL_ERROR,
content::NotificationService::AllBrowserContextsAndSources());
cache_->Init(true, base::Bind(&ExtensionCacheImpl::OnCacheInitialized,
weak_ptr_factory_.GetWeakPtr()));
}
ExtensionCacheImpl::~ExtensionCacheImpl() {
}
void ExtensionCacheImpl::Start(const base::Closure& callback) {
if (!cache_ || cache_->is_ready()) {
DCHECK(init_callbacks_.empty());
callback.Run();
} else {
init_callbacks_.push_back(callback);
}
}
void ExtensionCacheImpl::Shutdown(const base::Closure& callback) {
if (cache_)
cache_->Shutdown(callback);
else
callback.Run();
}
void ExtensionCacheImpl::AllowCaching(const std::string& id) {
allowed_extensions_.insert(id);
}
bool ExtensionCacheImpl::GetExtension(const std::string& id,
const std::string& expected_hash,
base::FilePath* file_path,
std::string* version) {
if (cache_ && CachingAllowed(id))
return cache_->GetExtension(id, expected_hash, file_path, version);
else
return false;
}
void ExtensionCacheImpl::PutExtension(const std::string& id,
const std::string& expected_hash,
const base::FilePath& file_path,
const std::string& version,
const PutExtensionCallback& callback) {
if (cache_ && CachingAllowed(id))
cache_->PutExtension(id, expected_hash, file_path, version, callback);
else
callback.Run(file_path, true);
}
bool ExtensionCacheImpl::CachingAllowed(const std::string& id) {
return ContainsKey(allowed_extensions_, id);
}
void ExtensionCacheImpl::OnCacheInitialized() {
for (std::vector<base::Closure>::iterator it = init_callbacks_.begin();
it != init_callbacks_.end(); ++it) {
it->Run();
}
init_callbacks_.clear();
uint64 cache_size = 0;
size_t extensions_count = 0;
if (cache_->GetStatistics(&cache_size, &extensions_count)) {
UMA_HISTOGRAM_COUNTS_100("Extensions.ExtensionCacheCount",
extensions_count);
UMA_HISTOGRAM_MEMORY_MB("Extensions.ExtensionCacheSize",
cache_size / (1024 * 1024));
}
}
void ExtensionCacheImpl::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
if (!cache_)
return;
switch (type) {
case extensions::NOTIFICATION_EXTENSION_INSTALL_ERROR: {
extensions::CrxInstaller* installer =
content::Source<extensions::CrxInstaller>(source).ptr();
const std::string& id = installer->expected_id();
const std::string& hash = installer->expected_hash();
const extensions::CrxInstallError* error =
content::Details<const extensions::CrxInstallError>(details).ptr();
switch (error->type()) {
case extensions::CrxInstallError::ERROR_DECLINED:
DVLOG(2) << "Extension install was declined, file kept";
break;
case extensions::CrxInstallError::ERROR_HASH_MISMATCH: {
if (cache_->ShouldRetryDownload(id, hash)) {
cache_->RemoveExtension(id, hash);
installer->set_hash_check_failed(true);
}
// We deliberately keep the file with incorrect hash sum, so that it
// will not be re-downloaded each time.
} break;
default:
cache_->RemoveExtension(id, hash);
break;
}
break;
}
default:
NOTREACHED();
}
}
} // namespace extensions
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