How do I rate limit by req/min instead of req/s?

[Firu115]

I'm migrating from Fiber to Echo and I can't figure out how Echo rate limiter middleware can limit reqests per minute.

With this code, the limit is 5 requests per second. I need 5 per minute...

package main

import (
	"net/http"
	"time"

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
	"golang.org/x/time/rate"
)

var rateLimiter echo.MiddlewareFunc = middleware.RateLimiterWithConfig(middleware.RateLimiterConfig{
	Skipper: middleware.DefaultSkipper,
	Store: middleware.NewRateLimiterMemoryStoreWithConfig(
		middleware.RateLimiterMemoryStoreConfig{Rate: rate.Limit(5), Burst: 0, ExpiresIn: time.Minute},
	),
	IdentifierExtractor: func(c echo.Context) (string, error) {
		return c.RealIP(), nil
	},
	DenyHandler: func(c echo.Context, identifier string, err error) error {
		return c.NoContent(http.StatusTeapot)
	},
})

func main() {
	e := echo.New()
	e.Use(rateLimiter)

	e.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "Hello, World!")
	})

	e.Logger.Fatal(e.Start(":1323"))
}

[aldas]

maybe

			middleware.RateLimiterMemoryStoreConfig{
				Rate:      rate.Every(5 * time.Minute / 5),
				Burst:     5,
				ExpiresIn: 5 * time.Minute,
			},

But you should read https://pkg.go.dev/golang.org/x/time@v0.7.0/rate#Limit how limiting works.

[Firu115]

That works I guess. Thanks!
It is somehow confusing for me in comparison with Fiber:

app.Use(limiter.New(limiter.Config{
	Max:               5,
	Expiration:        time.Minute,
	LimiterMiddleware: limiter.SlidingWindow{},
	KeyGenerator: func(c *fiber.Ctx) string {
		return c.IP()
	},
	LimitReached: func(c *fiber.Ctx) error {
		return c.SendStatus(fiber.StatusTeapot)
	},
}))

[aldas]

This is because Fiber has their own implementation while Echo just wraps Go team golang.org/x/time package which is more oriented to req/s usecases.