cache.md

Cache

Cache middleware for Fiber designed to intercept responses and cache them. This middleware will cache the Body, Content-Type and StatusCode using the c.Path() as unique identifier. Special thanks to @codemicro for creating this middleware for Fiber core!

Table of Contents

• Signatures
• Examples
• Config
• Default Config

Signatures

func New(config ...Config) fiber.Handler

Examples

Import the middleware package that is part of the Fiber web framework

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/cache"
)

After you initiate your Fiber app, you can use the following possibilities:

// Initialize default config
app.Use(cache.New())

// Or extend your config for customization
app.Use(cache.New(cache.Config{
    Next: func(c *fiber.Ctx) bool {
        return c.Query("refresh") == "true"
    },
    Expiration: 30 * time.Minute,
    CacheControl: true,
}))

Or you can custom key and expire time like this:

app.Use(New(Config{
	ExpirationGenerator: func(c *fiber.Ctx, cfg *Config) time.Duration {
		newCacheTime, _ := strconv.Atoi(c.GetRespHeader("Cache-Time", "600"))
		return time.Second * time.Duration(newCacheTime)
	},
	KeyGenerator: func(c *fiber.Ctx) string {
		return c.Path()
	}
}))

app.Get("/", func(c *fiber.Ctx) error {
	c.Response().Header.Add("Cache-Time", "6000")
	return c.SendString("hi")
})

Config

// Config defines the config for middleware.
type Config struct {
    // Next defines a function to skip this middleware when returned true.
    //
    // Optional. Default: nil
    Next func(c *fiber.Ctx) bool

    // Expiration is the time that an cached response will live
    //
    // Optional. Default: 1 * time.Minute
    Expiration time.Duration

    // CacheControl enables client side caching if set to true
    //
    // Optional. Default: false
    CacheControl bool

    // Key allows you to generate custom keys, by default c.Path() is used
    //
    // Default: func(c *fiber.Ctx) string {
    //   return utils.CopyString(c.Path())
    // }
    KeyGenerator func(*fiber.Ctx) string
    
    // allows you to generate custom Expiration Key By Key, default is Expiration (Optional)
    //
    // Default: nil
    ExpirationGenerator func(*fiber.Ctx, *Config) time.Duration

    // Store is used to store the state of the middleware
    //
    // Default: an in memory store for this process only
    Storage fiber.Storage
}

Default Config

// ConfigDefault is the default config
var ConfigDefault = Config{
    Next:         nil,
    Expiration:   1 * time.Minute,
    CacheControl: false,
    KeyGenerator: func(c *fiber.Ctx) string {
        return utils.CopyString(c.Path())
    },
	ExpirationGenerator : nil,
    Storage:      nil,
}