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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_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 browsing_data {
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(content::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(content::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::Bind(completion_callback_, net::OK));
base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
return;
}
previous_entry_ = current_entry_;
error = iterator_->OpenNextEntry(
¤t_entry_,
base::Bind(&ConditionalCacheDeletionHelper::IterateOverEntries,
base::Unretained(this)));
}
}
} // namespace browsing_data
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