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.

Modules

adaptors

Storage adaptors providing different backend implementations.

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

Traits

Lease

Lease management interface for key expiration.