Struct FencedWal 

pub struct FencedWal { /* private fields */ }

WAL manager with epoch fencing for split-brain protection

This is a wrapper around the standard WAL that adds:

• Epoch-based writer fencing
• CRC chain verification
• Split-brain detection during recovery

Implementations

impl FencedWal

pub fn open<P: AsRef<Path>>(path: P) -> Result<Self>

Open or create a fenced WAL

If the WAL exists with a different writer_id in the same epoch, returns an error indicating split-brain.

pub fn append(&mut self, payload: Vec<u8>) -> Result<u64>

Append an entry with epoch fencing

pub fn sync(&mut self) -> Result<()>

Sync to disk and update header

pub fn commit(&mut self, lsn: u64) -> Result<()>

Mark a commit point

pub fn epoch(&self) -> u64

Get current epoch

pub fn writer_id(&self) -> Uuid

Get current writer ID

pub fn last_commit_lsn(&self) -> u64

Get last committed LSN

pub fn entry_count(&self) -> u64

Get entry count

pub fn replay<F>(&mut self, callback: F) -> Result<u64>

where F: FnMut(&FencedWalEntry) -> Result<()>,

Replay all entries, verifying chain integrity

pub fn replay_committed<F>(&mut self, callback: F) -> Result<u64>

where F: FnMut(&FencedWalEntry) -> Result<()>,

Replay only committed entries