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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.
#ifndef COMPONENTS_LEVELDB_LEVELDB_DATABASE_IMPL_H_
#define COMPONENTS_LEVELDB_LEVELDB_DATABASE_IMPL_H_
#include <memory>
#include "base/unguessable_token.h"
#include "components/leveldb/public/interfaces/leveldb.mojom.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "third_party/leveldatabase/src/include/leveldb/db.h"
namespace leveldb {
// The backing to a database object that we pass to our called.
class LevelDBDatabaseImpl : public mojom::LevelDBDatabase {
public:
LevelDBDatabaseImpl(std::unique_ptr<leveldb::Env> environment,
std::unique_ptr<leveldb::DB> db);
~LevelDBDatabaseImpl() override;
// Overridden from LevelDBDatabase:
void Put(const std::vector<uint8_t>& key,
const std::vector<uint8_t>& value,
const PutCallback& callback) override;
void Delete(const std::vector<uint8_t>& key,
const DeleteCallback& callback) override;
void DeletePrefixed(const std::vector<uint8_t>& key_prefix,
const DeletePrefixedCallback& callback) override;
void Write(std::vector<mojom::BatchedOperationPtr> operations,
const WriteCallback& callback) override;
void Get(const std::vector<uint8_t>& key,
const GetCallback& callback) override;
void GetPrefixed(const std::vector<uint8_t>& key_prefix,
const GetPrefixedCallback& callback) override;
void GetSnapshot(const GetSnapshotCallback& callback) override;
void ReleaseSnapshot(const base::UnguessableToken& snapshot) override;
void GetFromSnapshot(const base::UnguessableToken& snapshot,
const std::vector<uint8_t>& key,
const GetCallback& callback) override;
void NewIterator(const NewIteratorCallback& callback) override;
void NewIteratorFromSnapshot(
const base::UnguessableToken& snapshot,
const NewIteratorFromSnapshotCallback& callback) override;
void ReleaseIterator(const base::UnguessableToken& iterator) override;
void IteratorSeekToFirst(
const base::UnguessableToken& iterator,
const IteratorSeekToFirstCallback& callback) override;
void IteratorSeekToLast(const base::UnguessableToken& iterator,
const IteratorSeekToLastCallback& callback) override;
void IteratorSeek(const base::UnguessableToken& iterator,
const std::vector<uint8_t>& target,
const IteratorSeekToLastCallback& callback) override;
void IteratorNext(const base::UnguessableToken& iterator,
const IteratorNextCallback& callback) override;
void IteratorPrev(const base::UnguessableToken& iterator,
const IteratorPrevCallback& callback) override;
private:
// Returns the state of |it| to a caller. Note: This assumes that all the
// iterator movement methods have the same callback signature. We don't
// directly reference the underlying type in case of bindings change.
void ReplyToIteratorMessage(leveldb::Iterator* it,
const IteratorSeekToFirstCallback& callback);
leveldb::Status DeletePrefixedHelper(const leveldb::Slice& key_prefix,
leveldb::WriteBatch* batch);
std::unique_ptr<leveldb::Env> environment_;
std::unique_ptr<leveldb::DB> db_;
std::map<base::UnguessableToken, const Snapshot*> snapshot_map_;
// TODO(erg): If we have an existing iterator which depends on a snapshot,
// and delete the snapshot from the client side, that shouldn't delete the
// snapshot maybe? At worse it's a DDoS if there's multiple users of the
// system, but this maybe should be fixed...
std::map<base::UnguessableToken, Iterator*> iterator_map_;
DISALLOW_COPY_AND_ASSIGN(LevelDBDatabaseImpl);
};
} // namespace leveldb
#endif // COMPONENTS_LEVELDB_LEVELDB_DATABASE_IMPL_H_
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