Walrog is a Go library that implements a simple yet functional Write-Ahead Logging (WAL) system. It was designed as a personal project to understand and demonstrate the fundamentals of WAL, offering reliable data persistence and crash recovery mechanisms.

• Sequential logging with LSN, length, and CRC validation.
• Buffered writes to disk with automatic WAL file rotation.
• Recovery of valid records from existing WAL files.
• Configurable segmentation and initial checkpoint system.
• CRC-based data integrity checks.
• Unit tests covering the main functional use cases.

Clone the repository:

git clone https://github.com/casteloig/walrog.git
cd walrog

Make sure you have Go 1.18 or higher installed.

package main

import (
	"fmt"
	"github.com/casteloig/walrog/internal/core"
)

func main() {
	// Initialize with default options
	wal, err := core.InitWal(nil)
	if err != nil {
		panic(err)
	}

	// Write a message
	err = wal.WriteBuffer([]byte("Hello World!"))
	if err != nil {
		panic(err)
	}

	// Flush to disk
	err = wal.FlushBuffer()
	if err != nil {
		panic(err)
	}

	fmt.Println("Entry successfully written.")
}

MIT License. See the LICENSE file for more details.