Distributed Services with Go

Build a Commit Log Prototype

We’ll explore commit logs in depth in Chapter 3, ​Write a Log Package​, when we build a persisted commit log library. For now, all you need to know about commit logs is that they’re a data structure for an append-only sequence of records, ordered by time, and you can build a simple commit log with a slice.

Create an internal/server directory tree in the root of your project and put the following code under the server directory in a file called log.go:

LetsGo/internal/server/log.go

package server

import (
        "fmt"
        "sync"
)

type Log struct {
        mu      sync.Mutex
        records []Record
}

func NewLog() *Log {
        return &Log{}
}

func (c *Log) Append(record Record) (uint64, error) {
 c.mu.Lock() ...