import (
    rate "github.com/bynf/rate/redis"
)

// initialize redis.
rate.SetRedis(&rate.ConfigRedis{
    Host: "127.0.0.1",
    Port: 6379,
    Auth: "",
}

// setup a 1 ops/s rate limiter.
limiter := rate.NewLimiter(Every(time.Second), 1, "a-sample-operation")
if limiter.Allow() {
    // serve the user request
} else {
    // reject the user request
}

// setup a 1000 ops/s rate limiter.
limiter := rate.NewLimiter(Every(time.Second/time.Duration(1000)), 1000, "a-sample-operation")
if limiter.Allow() {
    // serve the user request
} else {
    // reject the user request
}