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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SERVICES_STORAGE_INDEXED_DB_SCOPES_LEVELDB_SCOPES_TASKS_H_
#define COMPONENTS_SERVICES_STORAGE_INDEXED_DB_SCOPES_LEVELDB_SCOPES_TASKS_H_
#include <stdint.h>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "components/services/storage/indexed_db/leveldb/leveldb_state.h"
#include "third_party/leveldatabase/src/include/leveldb/status.h"
#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
namespace leveldb {
struct ReadOptions;
struct WriteOptions;
} // namespace leveldb
namespace content::indexed_db {
// This base class is thread-compatible, and is designed to be constructed on
// one thread, and then used & destroyed on another.
class LevelDBScopesTask {
public:
explicit LevelDBScopesTask(scoped_refptr<LevelDBState> level_db,
size_t max_write_batch_size_bytes);
LevelDBScopesTask(const LevelDBScopesTask&) = delete;
LevelDBScopesTask& operator=(const LevelDBScopesTask&) = delete;
~LevelDBScopesTask();
protected:
// Submits the in-progress WriteBatch to LevelDB, no matter what size the
// batch is.
[[nodiscard]] leveldb::Status SubmitWriteBatch(
const leveldb::WriteOptions& options);
// Submits thein-progress WriteBatch to LevelDB only if the approximate size
// of the batch is > |max_write_batch_size_|.
[[nodiscard]] leveldb::Status MaybeSubmitWriteBatch(
const leveldb::WriteOptions& options);
[[nodiscard]] leveldb::Status DeleteRange(
leveldb::Slice range_start,
leveldb::Slice range_end,
const leveldb::ReadOptions& read_options,
const leveldb::WriteOptions& write_options);
SEQUENCE_CHECKER(sequence_checker_);
const scoped_refptr<LevelDBState> level_db_;
const size_t max_write_batch_size_bytes_;
leveldb::WriteBatch write_batch_;
};
// Deletes the undo log for a given scope, and optionally executes the cleanup
// tasks recorded in the scope.
//
// Note: Tasks are constructed on one thread and then Run() and destroyed on a
// separate thread.
class CleanupScopeTask : private LevelDBScopesTask {
public:
enum class CleanupMode {
// Used after a scope is committed.
kExecuteCleanupTasks,
// Used after a scope is reverted.
kIgnoreCleanupTasks,
};
CleanupScopeTask(scoped_refptr<LevelDBState> level_db,
std::vector<uint8_t> metadata_prefix,
int64_t scope_number,
CleanupMode mode,
size_t max_write_batch_size_bytes);
~CleanupScopeTask();
[[nodiscard]] leveldb::Status Run();
private:
[[nodiscard]] leveldb::Status ExecuteAndDeleteCleanupTasks(
const leveldb::ReadOptions& read_options,
const leveldb::WriteOptions& write_options);
[[nodiscard]] leveldb::Status DeletePrefixedRange(
leveldb::Slice prefix,
const leveldb::ReadOptions& read_options,
const leveldb::WriteOptions& write_options);
const std::vector<uint8_t> metadata_prefix_;
const int64_t scope_number_;
const CleanupMode mode_;
};
// This task executes & deletes the undo tasks for the given scope, and then
// marks the scope as committed. It should then be cleaned up by a
// CleanupScopeTask that ignores the cleanup tasks (kIgnoreCleanupTasks).
//
// Note: Tasks are constructed on one thread and then |Run| and destroyed on a
// separate thread.
class RevertScopeTask : private LevelDBScopesTask {
public:
RevertScopeTask(scoped_refptr<LevelDBState> level_db,
std::vector<uint8_t> metadata_prefix,
int64_t scope_number,
size_t max_write_batch_size_bytes);
~RevertScopeTask();
[[nodiscard]] leveldb::Status Run();
private:
const std::vector<uint8_t> metadata_prefix_;
const int64_t scope_number_;
};
} // namespace content::indexed_db
#endif // COMPONENTS_SERVICES_STORAGE_INDEXED_DB_SCOPES_LEVELDB_SCOPES_TASKS_H_
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