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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/persistent_cache/backend_params_manager.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/sequence_checker.h"
#include "base/strings/strcat.h"
#include "base/task/thread_pool.h"
#include "components/persistent_cache/sqlite/sqlite_backend_impl.h"
namespace {
constexpr const char kPathSeparator[] = "_";
constexpr const char kDbFile[] = "db_file";
constexpr const char kJournalFile[] = "journal_file";
constexpr size_t kLruCacheCapacity = 100;
} // namespace
namespace persistent_cache {
BackendParamsManager::BackendParamsManager(base::FilePath top_directory)
: backend_params_map_(kLruCacheCapacity),
top_directory_(std::move(top_directory)) {}
BackendParamsManager::~BackendParamsManager() = default;
void BackendParamsManager::GetParamsSyncOrCreateAsync(
BackendType backend_type,
const std::string& key,
AccessRights access_rights,
CompletedCallback callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto it = backend_params_map_.Get(
BackendParamsKey{.backend_type = backend_type, .key = key});
if (it != backend_params_map_.end()) {
std::move(callback).Run(it->second);
return;
}
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE,
{base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::BindOnce(&BackendParamsManager::CreateParamsSync, top_directory_,
backend_type, key, access_rights),
base::BindOnce(&BackendParamsManager::SaveParams,
weak_factory_.GetWeakPtr(), key, std::move(callback)));
}
// static
BackendParams BackendParamsManager::CreateParamsSync(
base::FilePath directory,
BackendType backend_type,
const std::string& key,
AccessRights access_rights) {
BackendParams params;
params.type = backend_type;
const bool writes_supported = (access_rights == AccessRights::kReadWrite);
uint32_t flags = base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_READ;
if (writes_supported) {
flags |= base::File::FLAG_WRITE;
}
// PersistentCache backing files are not executables.
#if BUILDFLAG(IS_WIN)
flags |= base::File::FLAG_WIN_NO_EXECUTE;
#endif
params.db_file = base::File(
directory.AppendASCII(base::StrCat({key, kPathSeparator, kDbFile})),
flags);
params.db_file_is_writable = writes_supported;
params.journal_file = base::File(
directory.AppendASCII(base::StrCat({key, kPathSeparator, kJournalFile})),
flags);
params.journal_file_is_writable = writes_supported;
return params;
}
void BackendParamsManager::SaveParams(const std::string& key,
CompletedCallback callback,
BackendParams backend_params) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
std::move(callback).Run(backend_params);
// Avoid saving invalid files.
if (backend_params.db_file.IsValid() &&
backend_params.journal_file.IsValid()) {
backend_params_map_.Put(
BackendParamsKey{.backend_type = backend_params.type, .key = key},
std::move(backend_params));
}
}
} // namespace persistent_cache
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