blob: ce7b8a19d6a71cbe790425f5e09a1a4b30e50743 [file] [log] [blame]
// Copyright 2016 The Fuchsia 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 <lib/fit/function.h>
#include <lib/fsl/vmo/sized_vmo.h>
#include <functional>
#include "peridot/lib/convert/convert.h"
#include "src/ledger/bin/fidl/include/types.h"
#include "src/ledger/bin/storage/public/page_storage.h"
#include "src/lib/fxl/macros.h"
#include "src/lib/fxl/strings/string_view.h"
namespace ledger {
class PageUtils {
// Converts a status from storage into a status from the FIDL API.
static Status ConvertStatus(storage::Status status);
// From a callback that takes as first argument a Status, returns one that
// takes a storage::Status and use |ConvertStatus| to transform the received
// value into the expected one.
template <typename... A>
static fit::function<void(storage::Status, A...)> AdaptStatusCallback(
fit::function<void(Status, A...)> callback) {
return [callback = std::move(callback)](storage::Status status, A... args) {
callback(ConvertStatus(status), std::forward<A>(args)...);
// Retrieves the data referenced by the given identifier as a StringView with
// no offset.
static void ResolveObjectIdentifierAsStringView(
storage::PageStorage* storage,
storage::ObjectIdentifier object_identifier,
storage::PageStorage::Location location,
fit::function<void(storage::Status, fxl::StringView)> callback);
// Retrieves the data referenced by the given identifier and returns a subset
// of its contents as a buffer. |offset| can be negative. In that case, the
// offset is understood as starting from the end of the contents.
static void ResolveObjectIdentifierAsBuffer(
storage::PageStorage* storage,
storage::ObjectIdentifier object_identifier, int64_t offset,
int64_t max_size, storage::PageStorage::Location location,
fit::function<void(storage::Status, fsl::SizedVmo)> callback);
// Returns true if a key matches the provided prefix, false otherwise.
static bool MatchesPrefix(const std::string& key, const std::string& prefix);
} // namespace ledger