// Copyright 2018 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 "services/network/conditional_cache_deletion_helper.h" #include "base/bind.h" #include "base/callback.h" #include "base/location.h" #include "base/task/single_thread_task_runner.h" #include "base/threading/thread_task_runner_handle.h" #include "net/http/http_cache.h" #include "net/http/http_util.h" namespace { bool EntryPredicateFromURLsAndTime( const base::RepeatingCallback& url_matcher, const base::Time& begin_time, const base::Time& end_time, const disk_cache::Entry* entry) { std::string entry_key(entry->GetKey()); std::string url_string( net::HttpCache::GetResourceURLFromHttpCacheKey(entry_key)); return (entry->GetLastUsed() >= begin_time && entry->GetLastUsed() < end_time && url_matcher.Run(GURL(url_string))); } } // namespace namespace network { // static std::unique_ptr ConditionalCacheDeletionHelper::CreateAndStart( disk_cache::Backend* cache, const base::RepeatingCallback& url_matcher, const base::Time& begin_time, const base::Time& end_time, base::OnceClosure completion_callback) { std::unique_ptr deletion_helper( new ConditionalCacheDeletionHelper( base::BindRepeating( &EntryPredicateFromURLsAndTime, url_matcher, begin_time.is_null() ? base::Time() : begin_time, end_time.is_null() ? base::Time::Max() : end_time), std::move(completion_callback), cache->CreateIterator())); // Any status other than OK (since no entry), IO_PENDING, or FAILED would // work here. deletion_helper->IterateOverEntries( disk_cache::EntryResult::MakeError(net::ERR_CACHE_OPEN_FAILURE)); return deletion_helper; } ConditionalCacheDeletionHelper::ConditionalCacheDeletionHelper( const base::RepeatingCallback& condition, base::OnceClosure completion_callback, std::unique_ptr iterator) : condition_(condition), completion_callback_(std::move(completion_callback)), iterator_(std::move(iterator)) {} ConditionalCacheDeletionHelper::~ConditionalCacheDeletionHelper() = default; void ConditionalCacheDeletionHelper::IterateOverEntries( disk_cache::EntryResult result) { while (result.net_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_.get())) { previous_entry_->Doom(); } previous_entry_->Close(); } if (result.net_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. base::ThreadTaskRunnerHandle::Get()->PostTask( FROM_HERE, base::BindOnce(&ConditionalCacheDeletionHelper::NotifyCompletion, weak_factory_.GetWeakPtr())); return; } previous_entry_ = result.ReleaseEntry(); result = iterator_->OpenNextEntry( base::BindOnce(&ConditionalCacheDeletionHelper::IterateOverEntries, weak_factory_.GetWeakPtr())); } } void ConditionalCacheDeletionHelper::NotifyCompletion() { std::move(completion_callback_).Run(); } } // namespace network