fiber/middleware/cache

Cache Middleware

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() (or a string returned by the Key function) as unique identifier. Special thanks to @codemicro for creating this middleware for Fiber core!

Request Directives
Cache-Control: no-cache will return the up-to-date response but still caches it. You will always get a miss cache status.
Cache-Control: no-store will refrain from caching. You will always get the up-to-date response.

Table of Contents

• Cache Middleware
  • Table of Contents
  • Signatures
  • Examples
    • Default Config
    • Custom Config
    • Custom Cache Key Or Expiration
    • Config
    • Default Config

Signatures

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

Examples

First import the middleware from Fiber,

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

Then create a Fiber app with app := fiber.New().

Default Config

app.Use(cache.New())

Custom Config

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

Custom Cache Key Or Expiration

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 utils.CopyString(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

	// CacheHeader header on response header, indicate cache status, with the following possible return value
	//
	// hit, miss, unreachable
	//
	// Optional. Default: X-Cache
	CacheHeader string

	// 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

	// allows you to store additional headers generated by next middlewares & handler
	//
	// Default: false
	StoreResponseHeaders bool

	// Max number of bytes of response bodies simultaneously stored in cache. When limit is reached,
	// entries with the nearest expiration are deleted to make room for new.
	// 0 means no limit
	//
	// Default: 0
	MaxBytes uint

	// You can specify HTTP methods to cache.
	// The middleware just caches the routes of its methods in this slice.
	//
	// Default: []string{fiber.MethodGet, fiber.MethodHead}
	Methods []string
}

Default Config

// ConfigDefault is the default config
var ConfigDefault = Config{
	Next:         nil,
	Expiration:   1 * time.Minute,
	CacheHeader:  "X-Cache",
	CacheControl: false,
	KeyGenerator: func(c *fiber.Ctx) string {
		return utils.CopyString(c.Path())
	},
	ExpirationGenerator:  nil,
	StoreResponseHeaders: false,
	Storage:              nil,
	MaxBytes:             0,
	Methods:              []string{fiber.MethodGet, fiber.MethodHead},
}