Module storage 

Storage layer implementations

Provides file-based and RocksDB storage backends. Storage layer for d-engine.

This module provides pluggable and extensible storage components for persisting Raft state and application data. It defines core traits, adapters, and utilities to support different backend implementations.

Key responsibilities include:

• Managing Raft log entries and snapshots.
• Providing an abstraction layer (StorageEngine) for persistence.
• Supporting in-memory buffering and disk-backed storage (e.g., via Sled).
• Coordinating state machine application and snapshot lifecycle.
• Managing key expiration through lease-based lifecycle management.

This module is designed so developers can easily implement custom storage backends without changing the Raft protocol logic.

Structs

BufferedRaftLog

High-performance buffered Raft log with event-driven architecture

DefaultLease

Default lease implementation with single-index lock-free architecture.

FileLogStore

File-based log store implementation

FileMetaStore

File-based metadata store implementation

FileStateMachine

File-based state machine implementation with persistence

FileStorageEngine

File-based Raft log storage

RocksDBLogStore

RocksDB-based log store implementation

RocksDBMetaStore

RocksDB-based metadata store implementation

RocksDBStateMachine

RocksDB-based state machine implementation with lease support

RocksDBStorageEngine

RocksDB-based Raft log storage

Enums

LogCommand

Commands for the log processor

Traits

Lease

Lease management interface for key expiration.