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// Copyright 2016 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/browsing_data/content/conditional_cache_counting_helper.h"
#include "base/callback.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "net/disk_cache/disk_cache.h"
#include "net/http/http_cache.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
using content::BrowserThread;
namespace browsing_data {
// static.
ConditionalCacheCountingHelper* ConditionalCacheCountingHelper::CreateForRange(
content::StoragePartition* storage_partition,
base::Time begin_time,
base::Time end_time) {
return new ConditionalCacheCountingHelper(
begin_time, end_time, storage_partition->GetURLRequestContext(),
storage_partition->GetMediaURLRequestContext());
}
ConditionalCacheCountingHelper::ConditionalCacheCountingHelper(
base::Time begin_time,
base::Time end_time,
net::URLRequestContextGetter* main_context_getter,
net::URLRequestContextGetter* media_context_getter)
: calculation_result_(0),
begin_time_(begin_time),
end_time_(end_time),
is_finished_(false),
main_context_getter_(main_context_getter),
media_context_getter_(media_context_getter),
next_cache_state_(CacheState::NONE),
cache_(nullptr),
iterator_(nullptr),
weak_ptr_factory_(this) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
ConditionalCacheCountingHelper::~ConditionalCacheCountingHelper() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
base::WeakPtr<ConditionalCacheCountingHelper>
ConditionalCacheCountingHelper::CountAndDestroySelfWhenFinished(
const CacheCountCallback& result_callback) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(!result_callback.is_null());
result_callback_ = result_callback;
calculation_result_ = 0;
is_upper_limit_ = false;
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&ConditionalCacheCountingHelper::CountHttpCacheOnIOThread,
base::Unretained(this)));
return weak_ptr_factory_.GetWeakPtr();
}
bool ConditionalCacheCountingHelper::IsFinished() {
return is_finished_;
}
void ConditionalCacheCountingHelper::Finished() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(!is_finished_);
is_finished_ = true;
result_callback_.Run(calculation_result_, is_upper_limit_);
base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
}
void ConditionalCacheCountingHelper::CountHttpCacheOnIOThread() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
next_cache_state_ = CacheState::NONE;
DCHECK_EQ(CacheState::NONE, next_cache_state_);
DCHECK(main_context_getter_.get());
DCHECK(media_context_getter_.get());
next_cache_state_ = CacheState::CREATE_MAIN;
DoCountCache(net::OK);
}
// The expected state sequence is CacheState::NONE --> CacheState::CREATE_MAIN
// --> CacheState::PROCESS_MAIN --> CacheState::CREATE_MEDIA -->
// CacheState::PROCESS_MEDIA --> CacheState::DONE.
// On error, we jump directly to CacheState::DONE.
void ConditionalCacheCountingHelper::DoCountCache(int rv) {
DCHECK_NE(CacheState::NONE, next_cache_state_);
while (rv != net::ERR_IO_PENDING && next_cache_state_ != CacheState::NONE) {
// On error, finish and return the error code. A valid result value might
// be of two types - either net::OK from the CREATE states, or the result
// of calculation from the PROCESS states. Since net::OK == 0, it is valid
// to simply add the value to the final calculation result.
if (rv < 0) {
calculation_result_ = rv;
next_cache_state_ = CacheState::DONE;
} else {
DCHECK_EQ(0, net::OK);
calculation_result_ += rv;
}
switch (next_cache_state_) {
case CacheState::CREATE_MAIN:
case CacheState::CREATE_MEDIA: {
// Get a pointer to the cache.
net::URLRequestContextGetter* getter =
(next_cache_state_ == CacheState::CREATE_MAIN)
? main_context_getter_.get()
: media_context_getter_.get();
net::HttpCache* http_cache = getter->GetURLRequestContext()
->http_transaction_factory()
->GetCache();
next_cache_state_ = (next_cache_state_ == CacheState::CREATE_MAIN)
? CacheState::COUNT_MAIN
: CacheState::COUNT_MEDIA;
rv = http_cache->GetBackend(
&cache_, base::Bind(&ConditionalCacheCountingHelper::DoCountCache,
base::Unretained(this)));
break;
}
case CacheState::COUNT_MAIN:
case CacheState::COUNT_MEDIA: {
next_cache_state_ = (next_cache_state_ == CacheState::COUNT_MAIN)
? CacheState::CREATE_MEDIA
: CacheState::DONE;
// |cache_| can be null if it cannot be initialized.
if (cache_) {
if (begin_time_.is_null() && end_time_.is_max()) {
rv = cache_->CalculateSizeOfAllEntries(
base::Bind(&ConditionalCacheCountingHelper::DoCountCache,
base::Unretained(this)));
} else {
rv = cache_->CalculateSizeOfEntriesBetween(
begin_time_, end_time_,
base::Bind(&ConditionalCacheCountingHelper::DoCountCache,
base::Unretained(this)));
if (rv == net::ERR_NOT_IMPLEMENTED) {
is_upper_limit_ = true;
rv = cache_->CalculateSizeOfAllEntries(
base::Bind(&ConditionalCacheCountingHelper::DoCountCache,
base::Unretained(this)));
}
}
cache_ = NULL;
}
break;
}
case CacheState::DONE: {
cache_ = NULL;
next_cache_state_ = CacheState::NONE;
// Notify the UI thread that we are done.
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&ConditionalCacheCountingHelper::Finished,
base::Unretained(this)));
return;
}
case CacheState::NONE: {
NOTREACHED() << "bad state";
return;
}
}
}
}
} // namespace browsing_data
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