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gorm v2的一个即插即用的旁路缓存解决方案

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gorm-cache

gorm-cache 旨在为gorm v2用户提供一个即插即用的旁路缓存解决方案。本缓存只适用于数据库表单主键时的场景。

特性

  • 即插即用
  • 旁路缓存
  • 穿透防护
  • 击穿防护
  • 多存储介质(内存/redis)

使用说明

import (
    "context"
    "github.com/asjdf/gorm-cache/cache"
    "github.com/asjdf/gorm-cache/storage"
    "github.com/redis/go-redis/v9"
)

func main() {
    dsn := "user:pass@tcp(127.0.0.1:3306)/database_name?charset=utf8mb4"
    db, _ := gorm.Open(mysql.Open(dsn), &gorm.Config{})
    
    redisClient := redis.NewClient(&redis.Options{
        Addr: "localhost:6379",    
    })
    
    cache, _ := cache.NewGorm2Cache(&config.CacheConfig{
        CacheLevel:           config.CacheLevelAll,
        CacheStorage:         storage.NewRedis(&storage.RedisStoreConfig{Client: redisClient}),
        InvalidateWhenUpdate: true, // when you create/update/delete objects, invalidate cache
        CacheTTL:             5000, // 5000 ms
        CacheMaxItemCnt:      50,   // if length of objects retrieved one single time 
                                    // exceeds this number, then don't cache
    })
    // More options in `config/config.go`
    db.Use(cache)    // use gorm plugin
    // cache.AttachToDB(db)

    var users []User
    
    db.Where("value > ?", 123).Find(&users) // search cache not hit, objects cached
    db.Where("value > ?", 123).Find(&users) // search cache hit
    
    db.Where("id IN (?)", []int{1, 2, 3}).Find(&users) // primary key cache not hit, users cached
    db.Where("id IN (?)", []int{1, 3}).Find(&users) // primary key cache hit
}

在gorm中主要有5种操作(括号中是gorm中对应函数名):

  1. Query (First/Take/Last/Find/FindInBatches/FirstOrInit/FirstOrCreate/Count/Pluck)
  2. Create (Create/CreateInBatches/Save)
  3. Delete (Delete)
  4. Update (Update/Updates/UpdateColumn/UpdateColumns/Save)
  5. Row (Row/Rows/Scan)

本库不支持Row操作的缓存。(WIP)

存储介质细节

本库支持使用2种 cache 存储介质:

  1. 内存 (ccache/gcache)
  2. Redis (所有数据存储在redis中,如果你有多个实例使用本缓存,那么他们不共享redis存储空间)

并且允许多个gorm-cache公用一个存储池,以确保同一数据库的多个gorm实例共享缓存。