caches

README

Gorm Caches

Gorm Caches plugin using database request reductions (easer), and response caching mechanism provide you an easy way to optimize database performance.

Features

• Database request reduction. If three identical requests are running at the same time, only the first one is going to be executed, and its response will be returned for all.
• Database response caching. By implementing the Cacher interface, you can easily setup a caching mechanism for your database queries.
• Supports all databases that are supported by gorm itself.

Install

go get -u github.com/go-gorm/caches/v2

Usage

Configure the easer, and the cacher, and then load the plugin to gorm.

package main

import (
	"fmt"
	"sync"

	"github.com/go-gorm/caches"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

func main() {
	db, _ := gorm.Open(
		mysql.Open("DATABASE_DSN"),
		&gorm.Config{},
	)
	cachesPlugin := &caches.Caches{Conf: &caches.Config{
		Easer: true,
		Cacher: &yourCacherImplementation{},
	}}
	_ = db.Use(cachesPlugin)
}

Easer Example

package main

import (
	"fmt"
	"sync"
	"time"

	"github.com/go-gorm/caches"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

type UserRoleModel struct {
	gorm.Model
	Name string `gorm:"unique"`
}

type UserModel struct {
	gorm.Model
	Name   string
	RoleId uint
	Role   *UserRoleModel `gorm:"foreignKey:role_id;references:id"`
}

func main() {
	db, _ := gorm.Open(
		mysql.Open("DATABASE_DSN"),
		&gorm.Config{},
	)

	cachesPlugin := &caches.Caches{Conf: &caches.Config{
		Easer: true,
	}}

	_ = db.Use(cachesPlugin)

	_ = db.AutoMigrate(&UserRoleModel{})

	_ = db.AutoMigrate(&UserModel{})

	adminRole := &UserRoleModel{
		Name: "Admin",
	}
	db.FirstOrCreate(adminRole, "Name = ?", "Admin")

	guestRole := &UserRoleModel{
		Name: "Guest",
	}
	db.FirstOrCreate(guestRole, "Name = ?", "Guest")

	db.Save(&UserModel{
		Name: "ktsivkov",
		Role: adminRole,
	})
	db.Save(&UserModel{
		Name: "anonymous",
		Role: guestRole,
	})

	var (
		q1Users []UserModel
		q2Users []UserModel
	)
	wg := &sync.WaitGroup{}
	wg.Add(2)
	go func() {
		db.Model(&UserModel{}).Joins("Role").Find(&q1Users, "Role.Name = ? AND Sleep(1) = false", "Admin")
		wg.Done()
	}()
	go func() {
		time.Sleep(500 * time.Millisecond)
		db.Model(&UserModel{}).Joins("Role").Find(&q2Users, "Role.Name = ? AND Sleep(1) = false", "Admin")
		wg.Done()
	}()
	wg.Wait()

	fmt.Println(fmt.Sprintf("%+v", q1Users))
	fmt.Println(fmt.Sprintf("%+v", q2Users))
}

Cacher Example

package main

import (
	"fmt"
	"sync"

	"github.com/go-gorm/caches"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

type UserRoleModel struct {
	gorm.Model
	Name string `gorm:"unique"`
}

type UserModel struct {
	gorm.Model
	Name   string
	RoleId uint
	Role   *UserRoleModel `gorm:"foreignKey:role_id;references:id"`
}

type dummyCacher struct {
	store *sync.Map
}

func (c *dummyCacher) init() {
	if c.store == nil {
		c.store = &sync.Map{}
	}
}

func (c *dummyCacher) Get(key string) *caches.Query {
	c.init()
	val, ok := c.store.Load(key)
	if !ok {
		return nil
	}

	return val.(*caches.Query)
}

func (c *dummyCacher) Store(key string, val *caches.Query) error {
	c.init()
	c.store.Store(key, val)
	return nil
}

func main() {
	db, _ := gorm.Open(
		mysql.Open("DATABASE_DSN"),
		&gorm.Config{},
	)

	cachesPlugin := &caches.Caches{Conf: &caches.Config{
		Cacher: &dummyCacher{},
	}}

	_ = db.Use(cachesPlugin)

	_ = db.AutoMigrate(&UserRoleModel{})

	_ = db.AutoMigrate(&UserModel{})

	adminRole := &UserRoleModel{
		Name: "Admin",
	}
	db.FirstOrCreate(adminRole, "Name = ?", "Admin")

	guestRole := &UserRoleModel{
		Name: "Guest",
	}
	db.FirstOrCreate(guestRole, "Name = ?", "Guest")

	db.Save(&UserModel{
		Name: "ktsivkov",
		Role: adminRole,
	})
	db.Save(&UserModel{
		Name: "anonymous",
		Role: guestRole,
	})

	var (
		q1Users []UserModel
		q2Users []UserModel
	)

	db.Model(&UserModel{}).Joins("Role").Find(&q1Users, "Role.Name = ? AND Sleep(1) = false", "Admin")
	fmt.Println(fmt.Sprintf("%+v", q1Users))

	db.Model(&UserModel{}).Joins("Role").Find(&q2Users, "Role.Name = ? AND Sleep(1) = false", "Admin")
	fmt.Println(fmt.Sprintf("%+v", q2Users))
}

License

MIT license.

Easer

The easer is an adjusted version of the ServantGo library to fit the needs of this plugin.

Documentation

Index

• func SetPointedValue(dest interface{}, src interface{})
• type Cacher
• type Caches
  • func (c *Caches) AfterWrite(db *gorm.DB)
  • func (c *Caches) Initialize(db *gorm.DB) error
  • func (c *Caches) Name() string
  • func (c *Caches) Query(db *gorm.DB)
• type Config
• type Query

Functions

func SetPointedValue

func SetPointedValue(dest interface{}, src interface{})

Types

type Cacher

type Cacher interface {
	Get(key string) *Query
	Store(key string, val *Query) error
	Delete(tag string, tags ...string) error
}

type Caches

type Caches struct {
	Conf *Config
	// contains filtered or unexported fields
}

func (*Caches) AfterWrite

func (c *Caches) AfterWrite(db *gorm.DB)

func (*Caches) Initialize

func (c *Caches) Initialize(db *gorm.DB) error

func (*Caches) Name

func (c *Caches) Name() string

func (*Caches) Query

func (c *Caches) Query(db *gorm.DB)

type Config

type Config struct {
	Easer  bool
	Cacher Cacher
}

type Query

type Query struct {
	Tags         []string
	Dest         interface{}
	RowsAffected int64
}