Module wal 

Write-Ahead Logging (WAL) for crash recovery.

This module implements a write-ahead log that ensures durability and enables crash recovery for storage operations. All mutations are logged before being applied, allowing recovery from incomplete operations after a crash.

Example

use chie_core::wal::{WriteAheadLog, LogEntry, Operation};
use std::path::PathBuf;

let mut wal = WriteAheadLog::new(PathBuf::from("/tmp/wal")).await?;

// Log a write operation
let entry = LogEntry {
    sequence: 1,
    operation: Operation::WriteChunk {
        cid: "QmTest".to_string(),
        chunk_index: 0,
        data: vec![1, 2, 3],
    },
    timestamp_ms: 1234567890,
};

wal.append(&entry).await?;

// Replay log after crash
let entries = wal.replay().await?;
for entry in entries {
    // Apply logged operations
}

// Truncate log after successful checkpoint
wal.truncate(10).await?;

Structs

LogEntry

A log entry in the WAL.

WriteAheadLog

Write-ahead log for crash recovery.

Enums

Operation

Types of operations that can be logged.

WalError

WAL error types.