Initialy are declare two globals variables ctx and persistence.

func init(), is used for load variables .env and fill variable persistence with client of redis.

I created a interface Persistence to apply strategy pattern.

RedisPersistence is a struct for conector redis, the methods GetLimit, Incr and Expire inplements the logic for use of the Redis.

In the func main init gin.Default(), then set up a variable config to receive the configs of cors, so r.use inject the configs of cors in gin.

The func handleRequest is used only take a message when status is ok.

The func rateLimiterMiddleware make role of intermediate the quantity of the requests. In your param pass the persistence. It logic implemented is first create three vars in local scope key, limit and blockTime. In the first if else is to split when the request is by ip of token. So is filled the variable in each case. After persistence.GetLimit return the limit or error

In the func getEnvInt is used for get values in file .env

set up in file .env the variables IP_LIMIT, TOKEN_LIMIT to configure maximum values for requests. When the values aren't pass, by default IP_LIMIT=10 and TOKEN_LIMIT=100.

Run the commands: go run main.go and docker compose up -d redis

Open in navigator the address: http://localhost:8080/api/resource

• When you use for navigator the the rate limit is used for ip

For test with token open the client request as Postman and set up in header request API_TOKEN. We put a public workspace for tests in Postman, but you to use ever other. For Postman:

• Alternatively you can use for website https://resttesttest.com/
  • Click in + Add header button
  • Filling empty fields, Header Name with API_KEY and Header Value with ever value
  • Press f12 in navigator chrome for open developer tools
  • Walk until network and click fetch/xhr
  • Click button Ajax Request