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// Copyright 2019 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/leveldb_proto/internal/migration_delegate.h"
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
namespace leveldb_proto {
MigrationDelegate::MigrationDelegate() = default;
MigrationDelegate::~MigrationDelegate() = default;
void MigrationDelegate::DoMigration(UniqueProtoDatabase* from,
UniqueProtoDatabase* to,
MigrationCallback callback) {
from->LoadKeysAndEntries(base::BindOnce(
&MigrationDelegate::OnLoadKeysAndEntries, weak_ptr_factory_.GetWeakPtr(),
std::move(callback), base::Unretained(to)));
}
void MigrationDelegate::OnLoadKeysAndEntries(
MigrationCallback callback,
UniqueProtoDatabase* to,
bool success,
std::unique_ptr<KeyValueMap> keys_entries) {
if (!success) {
DCHECK(base::SequencedTaskRunner::HasCurrentDefault());
auto current_task_runner = base::SequencedTaskRunner::GetCurrentDefault();
current_task_runner->PostTask(FROM_HERE,
base::BindOnce(std::move(callback), false));
return;
}
// Convert the std::map we got back into a vector of std::pairs to be used
// with UpdateEntries.
auto kev = std::make_unique<KeyValueVector>();
for (auto const& key_entry : *keys_entries)
kev->push_back(key_entry);
// Save the entries in |to|.
to->UpdateEntries(
std::move(kev), std::make_unique<KeyVector>(),
base::BindOnce(&MigrationDelegate::OnUpdateEntries,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void MigrationDelegate::OnUpdateEntries(MigrationCallback callback,
bool success) {
DCHECK(base::SequencedTaskRunner::HasCurrentDefault());
auto current_task_runner = base::SequencedTaskRunner::GetCurrentDefault();
current_task_runner->PostTask(FROM_HERE,
base::BindOnce(std::move(callback), success));
// TODO (thildebr): For additional insurance, verify the entries match,
// although they should if we got a success from UpdateEntries.
}
} // namespace leveldb_proto
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