| // 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 "content/browser/browsing_data/conditional_cache_deletion_helper.h" |
| |
| #include "base/callback.h" |
| #include "base/location.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| #include "content/public/browser/browser_thread.h" |
| |
| namespace { |
| |
| bool EntryPredicateFromURLsAndTime( |
| const base::Callback<bool(const GURL&)>& url_predicate, |
| const base::Time& begin_time, |
| const base::Time& end_time, |
| const disk_cache::Entry* entry) { |
| return (entry->GetLastUsed() >= begin_time && |
| entry->GetLastUsed() < end_time && |
| url_predicate.Run(GURL(entry->GetKey()))); |
| } |
| |
| } // namespace |
| |
| namespace content { |
| |
| ConditionalCacheDeletionHelper::ConditionalCacheDeletionHelper( |
| disk_cache::Backend* cache, |
| const base::Callback<bool(const disk_cache::Entry*)>& condition) |
| : cache_(cache), |
| condition_(condition), |
| current_entry_(nullptr), |
| previous_entry_(nullptr) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| } |
| |
| // static |
| base::Callback<bool(const disk_cache::Entry*)> |
| ConditionalCacheDeletionHelper::CreateURLAndTimeCondition( |
| const base::Callback<bool(const GURL&)>& url_predicate, |
| const base::Time& begin_time, |
| const base::Time& end_time) { |
| return base::Bind(&EntryPredicateFromURLsAndTime, url_predicate, |
| begin_time.is_null() ? base::Time() : begin_time, |
| end_time.is_null() ? base::Time::Max() : end_time); |
| } |
| |
| int ConditionalCacheDeletionHelper::DeleteAndDestroySelfWhenFinished( |
| const net::CompletionCallback& completion_callback) { |
| DCHECK_CURRENTLY_ON(BrowserThread::IO); |
| |
| completion_callback_ = completion_callback; |
| iterator_ = cache_->CreateIterator(); |
| |
| IterateOverEntries(net::OK); |
| return net::ERR_IO_PENDING; |
| } |
| |
| ConditionalCacheDeletionHelper::~ConditionalCacheDeletionHelper() {} |
| |
| void ConditionalCacheDeletionHelper::IterateOverEntries(int error) { |
| while (error != net::ERR_IO_PENDING) { |
| // If the entry obtained in the previous iteration matches the condition, |
| // mark it for deletion. The iterator is already one step forward, so it |
| // won't be invalidated. Always close the previous entry so it does not |
| // leak. |
| if (previous_entry_) { |
| if (condition_.Run(previous_entry_)) |
| previous_entry_->Doom(); |
| previous_entry_->Close(); |
| } |
| |
| if (error == net::ERR_FAILED) { |
| // The iteration finished successfully or we can no longer iterate |
| // (e.g. the cache was destroyed). We cannot distinguish between the two, |
| // but we know that there is nothing more that we can do, so we return OK. |
| base::ThreadTaskRunnerHandle::Get()->PostTask( |
| FROM_HERE, base::BindOnce(completion_callback_, net::OK)); |
| base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this); |
| return; |
| } |
| |
| previous_entry_ = current_entry_; |
| error = iterator_->OpenNextEntry( |
| ¤t_entry_, |
| base::BindOnce(&ConditionalCacheDeletionHelper::IterateOverEntries, |
| base::Unretained(this))); |
| } |
| } |
| |
| } // namespace content |