wal

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Go 的前置日志

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工具介绍

Go 的前置日志

`wal`

A simple and fast write ahead log for Go.

Features

High durability
Fast operations
Monotonic indexes
Batch writes
Log truncation from front or back.

Getting Started

Installing

To start using wal, install Go and run go get:

bash

$ go get -u github.com/tidwall/wal

This will retrieve the library.

Example

// open a new log file
log, err := wal.Open("mylog", nil)

// write some entries
err = log.Write(1, []byte("first entry"))
err = log.Write(2, []byte("second entry"))
err = log.Write(3, []byte("third entry"))

// read an entry
data, err := log.Read(1)
println(string(data))  // output: first entry

// close the log
err = log.Close()

Batch writes:


// write three entries as a batch
batch := new(wal.Batch)
batch.Write(1, []byte("first entry"))
batch.Write(2, []byte("second entry"))
batch.Write(3, []byte("third entry"))

err = log.WriteBatch(batch)

Truncating:

// write some entries
err = log.Write(1, []byte("first entry"))
...
err = log.Write(1000, []byte("thousandth entry"))

// truncate the log from index starting 350 and ending with 950.
err = log.TruncateFront(350)
err = log.TruncateBack(950)